Provided by: muon-meson_0.3.0-4_amd64 

NAME
meson-reference v1.5.1 - a reference for meson functions and objects
DESCRIPTION
This manual is divided into two sections, FUNCTIONS and OBJECTS. FUNCTIONS contains a reference for all
meson functions and methods. Methods are denoted by object_name.method_name(). OBJECTS contains
additional information about each object.
FUNCTIONS
add_global_arguments()
SYNOPSIS
void add_global_arguments(
Compiler argument...,
language:,
native: false,
)
DESCRIPTION
Adds global arguments to the compiler command line.
VARARGS
Compiler argument str, 0...N times
The compiler arguments to add
KWARGS
language list[str], required
Specifies the language(s) that the arguments should be applied to. If a list of languages is given,
the arguments are added to each of the corresponding compiler command lines. Note that there is no
way to remove an argument set in this way. If you have an argument that is only used in a subset of
targets, you have to specify it in per-target flags.
native bool, default: false, since 0.48.0
A boolean specifying whether the arguments should be applied to the native or cross compilation. If
`true` the arguments will only be used for native compilations. If `false` the arguments will only
be used in cross compilations. If omitted, the flags are added to native compilations if compiling
natively and cross compilations (only) when cross compiling.
NOTES
Usually you should use add_project_arguments instead, because that works even when you project is
used as a subproject. You must pass always arguments individually `arg1, arg2, ...` rather than as a
string `'arg1 arg2', ...`
add_global_link_arguments()
SYNOPSIS
void add_global_link_arguments(
Linker argument...,
language:,
native: false,
)
DESCRIPTION
Adds global arguments to the linker command line.
Like add_global_arguments but the arguments are passed to the linker.
VARARGS
Linker argument str, 0...N times
The linker arguments to add
KWARGS
language list[str], required
Specifies the language(s) that the arguments should be applied to. If a list of languages is given,
the arguments are added to each of the corresponding compiler command lines. Note that there is no
way to remove an argument set in this way. If you have an argument that is only used in a subset of
targets, you have to specify it in per-target flags.
native bool, default: false, since 0.48.0
A boolean specifying whether the arguments should be applied to the native or cross compilation. If
`true` the arguments will only be used for native compilations. If `false` the arguments will only
be used in cross compilations. If omitted, the flags are added to native compilations if compiling
natively and cross compilations (only) when cross compiling.
NOTES
Usually you should use add_project_link_arguments instead, because that works even when you project
is used as a subproject. You must pass always arguments individually `arg1, arg2, ...` rather than
as a string `'arg1 arg2', ...`
add_languages()
SYNOPSIS
bool add_languages(Language..., native:, required: true)
DESCRIPTION
Add programming languages used by the project.
This is equivalent to having them in the `project` declaration. This function is usually used to add
languages that are only used under some conditions.
Returns `true` if all languages specified were found and `false` otherwise.
If `native` is omitted, the languages may be used for either build or host machine, but are never
required for the build machine. (i.e. it is equivalent to `add_languages(langs, native: false,
required: required) and add_languages(langs, native: true, required: false)`. This default behaviour
may change to `native: false` in a future Meson version.
VARARGS
Language str, 0...N times
The languages to add
KWARGS
native bool, since 0.54.0
If set to `true`, the language will be used to compile for the build machine, if `false`, for the
host machine.
required bool | feature, default: true
If set to `true`, Meson will halt if any of the languages specified are not found. (since 0.47.0)
The value of a `feature`[1] option can also be passed.
EXAMPLE
project('foobar', 'c')
if compiling_for_osx
add_languages('objc')
endif
if add_languages('cpp', required : false)
executable('cpp-app', 'main.cpp')
endif
# More code...
add_project_arguments()
SYNOPSIS
void add_project_arguments(
Compiler argument...,
language:,
native: false,
)
DESCRIPTION
Adds project specific arguments to the compiler command line.
This function behaves in the same way as add_global_arguments except that the arguments are only used
for the current project, they won't be used in any other subproject.
VARARGS
Compiler argument str, 0...N times
The compiler arguments to add
KWARGS
language list[str], required
Specifies the language(s) that the arguments should be applied to. If a list of languages is given,
the arguments are added to each of the corresponding compiler command lines. Note that there is no
way to remove an argument set in this way. If you have an argument that is only used in a subset of
targets, you have to specify it in per-target flags.
native bool, default: false, since 0.48.0
A boolean specifying whether the arguments should be applied to the native or cross compilation. If
`true` the arguments will only be used for native compilations. If `false` the arguments will only
be used in cross compilations. If omitted, the flags are added to native compilations if compiling
natively and cross compilations (only) when cross compiling.
NOTES
You must pass always arguments individually `arg1, arg2, ...` rather than as a string `'arg1 arg2',
...`
add_project_dependencies()
SYNOPSIS
void add_project_dependencies(
dependencies...,
language:,
native: false,
)
since 0.63.0
DESCRIPTION
Adds arguments to the compiler and linker command line, so that the given set of dependencies is
included in all build products for this project.
VARARGS
dependencies dep, 0...N times
The dependencies to add; if internal dependencies are included, they must not include any built
object.
KWARGS
language list[str], required
Specifies the language(s) that the arguments should be applied to. If a list of languages is given,
the arguments are added to each of the corresponding compiler command lines. Note that there is no
way to remove an argument set in this way. If you have an argument that is only used in a subset of
targets, you have to specify it in per-target flags.
native bool, default: false, since 0.48.0
A boolean specifying whether the arguments should be applied to the native or cross compilation. If
`true` the arguments will only be used for native compilations. If `false` the arguments will only
be used in cross compilations. If omitted, the flags are added to native compilations if compiling
natively and cross compilations (only) when cross compiling.
add_project_link_arguments()
SYNOPSIS
void add_project_link_arguments(
Linker argument...,
language:,
native: false,
)
DESCRIPTION
Adds project specific arguments to the linker command line.
Like add_project_arguments but the arguments are passed to the linker.
VARARGS
Linker argument str, 0...N times
The linker arguments to add
KWARGS
language list[str], required
Specifies the language(s) that the arguments should be applied to. If a list of languages is given,
the arguments are added to each of the corresponding compiler command lines. Note that there is no
way to remove an argument set in this way. If you have an argument that is only used in a subset of
targets, you have to specify it in per-target flags.
native bool, default: false, since 0.48.0
A boolean specifying whether the arguments should be applied to the native or cross compilation. If
`true` the arguments will only be used for native compilations. If `false` the arguments will only
be used in cross compilations. If omitted, the flags are added to native compilations if compiling
natively and cross compilations (only) when cross compiling.
NOTES
You must pass always arguments individually `arg1, arg2, ...` rather than as a string `'arg1 arg2',
...`
add_test_setup()
SYNOPSIS
void add_test_setup(
name,
env:,
exclude_suites:,
exe_wrapper:,
gdb: false,
is_default: false,
timeout_multiplier: 1,
)
DESCRIPTION
Add a custom test setup. This setup can be used to run the tests with a custom setup, for example
under Valgrind.
To use the test setup, run `meson test --setup=name` inside the build dir.
Note that all these options are also available while running the `meson test` script for running
tests instead of `ninja test` or `msbuild RUN_TESTS.vcxproj`, etc depending on the backend.
POSARGS
name str, required
The name of the test setup
KWARGS
env env | list[str] | dict[str]
environment variables to set , such as `['NAME1=value1', 'NAME2=value2']`, or an env object which
allows more sophisticated environment juggling. (Since 0.52.0) A dictionary is also accepted.
exclude_suites list[str], since 0.57.0
A list of test suites that should be excluded when using this setup. Suites specified in the
`--suite` option to `meson test` will always run, overriding `add_test_setup` if necessary.
exe_wrapper list[str | external_program]
The command or script followed by the arguments to it
gdb bool, default: false
If `true`, the tests are also run under `gdb`
is_default bool, default: false, since 0.49.0
Set whether this is the default test setup. If `true`, the setup will be used whenever `meson
test` is run without the `--setup` option.
timeout_multiplier int, default: 1
A number to multiply the test timeout with. Since 0.57 if timeout_multiplier is `<= 0` the test
has infinite duration, in previous versions of Meson the test would fail with a timeout
immediately.
alias_target()
SYNOPSIS
alias_tgt alias_target(target_name, Dep...)
since 0.52.0
DESCRIPTION
This function creates a new top-level target. Like all top-level targets, this integrates with the
selected backend. For instance, with you can run it as `meson compile target_name`. This is a dummy
target that does not execute any command, but ensures that all dependencies are built. Dependencies
can be any build target. Since 0.60.0, this includes run_tgt.
POSARGS
target_name str, required
The name of the alias target
VARARGS
Dep tgt, 1...N times
The targets to depend on
assert()
SYNOPSIS
void assert(condition, [message])
DESCRIPTION
Abort with an error message if `condition` evaluates to `false`.
POSARGS
condition bool, required
Abort if this evaluates to `false`
OPTARGS
message str
The error message to print.
NOTES
The `message` argument is optional since 0.53.0 and defaults to print the condition statement.
benchmark()
SYNOPSIS
void benchmark(
name,
executable,
args:,
depends:,
env:,
priority: 0,
protocol: 'exitcode',
should_fail: false,
suite:,
timeout: 30,
verbose: false,
workdir:,
)
DESCRIPTION
Creates a benchmark item that will be run when the benchmark target is run. The behavior of this
function is identical to test except for:
* benchmark() has no `is_parallel` keyword because benchmarks are not run in parallel
* benchmark() does not automatically add the `MALLOC_PERTURB_` environment variable
Defined benchmarks can be run in a backend-agnostic way by calling `meson test --benchmark` inside
the build dir, or by using backend-specific commands, such as `ninja benchmark` or `msbuild
RUN_TESTS.vcxproj`.
POSARGS
name str, required
The unique test id
executable exe | jar | external_program | file | custom_tgt | custom_idx, required
The program to execute. (Since 1.4.0) A CustomTarget is also accepted.
KWARGS
args list[str | file | build_tgt | custom_tgt | custom_idx]
Arguments to pass to the executable
depends list[build_tgt | custom_tgt], since 0.46.0
specifies that this test depends on the specified target(s), even though it does not take any of
them as a command line argument. This is meant for cases where test finds those targets internally,
e.g. plugins or globbing. Those targets are built before test is executed even if they have
`build_by_default : false`.
env env | list[str] | dict[str]
environment variables to set, such as `['NAME1=value1', ´NAME2=value2']`, or an env object which
allows more sophisticated environment juggling. (Since 0.52.0) A dictionary is also accepted.
priority int, default: 0, since 0.52.0
specifies the priority of a test. Tests with a higher priority are started before tests with a
lower priority. The starting order of tests with identical priorities is implementation-defined.
The default priority is 0, negative numbers are permitted.
protocol str, default: 'exitcode', since 0.50.0
specifies how the test results are parsed and can be one of `exitcode`, `tap`, or `gtest`. For more
information about test harness protocol read Unit Tests[2]. The following values are accepted:
- `exitcode`: the executable's exit code is used by the test harness to record the outcome of the
test).
- `tap`: Test Anything Protocol[3].
- `gtest` (since 0.55.0): for Google Tests.
- `rust` (since 0.56.0): for native rust tests
should_fail bool, default: false
when true the test is considered passed if the executable returns a non-zero return value (i.e.
reports an error)
suite str | list[str]
`'label'` (or list of labels `['label1', 'label2']`) attached to this test. The suite name is
qualified by a (sub)project name resulting in `(sub)project_name:label`. In the case of a list of
strings, the suite names will be `(sub)project_name:label1`, `(sub)project_name:label2`, etc.
timeout int, default: 30
the amount of seconds the test is allowed to run, a test that exceeds its time limit is always
considered failed, defaults to 30 seconds. Since 0.57 if timeout is `<= 0` the test has infinite
duration, in previous versions of Meson the test would fail with a timeout immediately.
verbose bool, default: false, since 0.62.0
if true, forces the test results to be logged as if `--verbose` was passed to `meson test`.
workdir str
absolute path that will be used as the working directory for the test
NOTES
Prior to 0.52.0 benchmark would warn that `depends` and `priority` were unsupported, this is
incorrect.
both_libraries()
SYNOPSIS
both_libs both_libraries(
target_name,
source...,
<lang>_args:,
<lang>_pch:,
<lang>_shared_args:,
<lang>_static_args:,
build_by_default: true,
build_rpath:,
d_debug:,
d_import_dirs:,
d_module_versions:,
d_unittest: false,
darwin_versions:,
dependencies:,
extra_files:,
gnu_symbol_visibility:,
gui_app: false,
implicit_include_directories: true,
include_directories:,
install: false,
install_dir:,
install_mode:,
install_rpath:,
install_tag:,
link_args:,
link_depends:,
link_language:,
link_whole:,
link_with:,
name_prefix:,
name_suffix:,
native: false,
objects:,
override_options:,
pic:,
prelink:,
rust_abi:,
rust_crate_type:,
rust_dependency_map:,
sources:,
soversion:,
vala_args:,
vala_shared_args:,
vala_static_args:,
version:,
vs_module_defs:,
win_subsystem: 'console',
)
since 0.46.0
DESCRIPTION
Builds both a static and shared library with the given sources. Positional and keyword arguments are
otherwise the same as for library. Source files will be compiled only once and object files will be
reused to build both shared and static libraries, unless `b_staticpic` user option or `pic` argument
are set to false in which case sources will be compiled twice.
POSARGS
target_name str, required
The unique name of the build target
VARARGS
source str | file | custom_tgt | custom_idx | generated_list, 0...N times
Input source to compile. The following types are supported:
- Strings relative to the current source directory
- file objects defined in any preceding build file
- The return value of configure-time generators such as configure_file
- The return value of build-time generators such as custom_target or generator.process
These input files can be sources, objects, libraries, or any other file. Meson will automatically
categorize them based on the extension and use them accordingly. For instance, sources (`.c`,
`.cpp`, `.vala`, `.rs`, etc) will be compiled and objects (`.o`, `.obj`) and libraries (`.so`,
`.dll`, etc) will be linked.
With the Ninja backend, Meson will create a build-time order-only dependency[4] on all generated
input files, including unknown files. This is needed to bootstrap the generation of the real
dependencies in the depfile[5] generated by your compiler to determine when to rebuild sources.
Ninja relies on this dependency file for all input files, generated and non-generated. The
behavior is similar for other backends.
KWARGS
<lang>_args list[str]
compiler flags to use for the given language; eg: `cpp_args` for C++
<lang>_pch str
precompiled header file to use for the given language
<lang>_shared_args list[str], since 1.3.0
Arguments that are only passed to a shared library
<lang>_static_args list[str], since 1.3.0
Arguments that are only passed to a static library
build_by_default bool, default: true, since 0.38.0
Causes, when set to `true`, to have this target be built by default. This means it will be built
when `meson compile` is called without any arguments. The default value is `true` for all built
target types.
build_rpath str, since 0.42.0
A string to add to target's rpath definition in the build dir, but which will be removed on install
d_debug list[str]
The D version identifiers[6] to add during the compilation of D source files.
d_import_dirs list[str]
List of directories to look in for string imports used in the D programming language.
d_module_versions list[str | int]
List of module version identifiers set when compiling D sources.
d_unittest bool, default: false
When set to true, the D modules are compiled in debug mode.
darwin_versions str | int | list[str], since 0.48.0
Defines the `compatibility version` and `current version` for the dylib on macOS. If a list is
specified, it must be either zero, one, or two elements. If only one element is specified or if
it's not a list, the specified value will be used for setting both compatibility version and
current version. If unspecified, the `soversion` will be used as per the aforementioned rules.
dependencies list[dep]
one or more dependency objects created with dependency or compiler.find_library (for external deps)
or declare_dependency (for deps built by the project)
extra_files str | file | custom_tgt | custom_idx
Not used for the build itself but are shown as source files in IDEs that group files by targets
(such as Visual Studio)
gnu_symbol_visibility str, since 0.48.0
Specifies how symbols should be exported, see e.g the GCC Wiki[7] for more information. This value
can either be an empty string or one of `default`, `internal`, `hidden`, `protected` or
`inlineshidden`, which is the same as `hidden` but also includes things like C++ implicit
constructors as specified in the GCC manual. Ignored on compilers that do not support GNU
visibility arguments.
gui_app bool, default: false, deprecated since 0.56.0
When set to true flags this target as a GUI application on platforms where this makes a difference,
deprecated since 0.56.0, use `win_subsystem` instead.
implicit_include_directories bool, default: true, since 0.42.0
Controls whether Meson adds the current source and build directories to the include path
include_directories list[inc | str]
one or more objects created with the include_directories function, or (since 0.50.0) strings, which
will be transparently expanded to include directory objects
install bool, default: false
When set to true, this executable should be installed.
install_dir str
override install directory for this file. If the value is a relative path, it will be considered
relative the `prefix` option. For example, if you want to install plugins into a subdir, you'd use
something like this: `install_dir : get_option('libdir') / 'projectname-1.0'`.
install_mode list[str | int], since 0.47.0
Specify the file mode in symbolic format and optionally the owner/uid and group/gid for the
installed files.
See the `install_mode` kwarg of install_data for more information.
install_rpath str
A string to set the target's rpath to after install (but not before that). On Windows, this
argument has no effect.
install_tag str, since 0.60.0
A string used by the `meson install --tags` command to install only a subset of the files. By
default all build targets have the tag `runtime` except for static libraries that have the `devel`
tag.
link_args list[str]
Flags to use during linking. You can use UNIX-style flags here for all platforms.
link_depends str | file | custom_tgt | custom_idx
Strings, files, or custom targets the link step depends on such as a symbol visibility map. The
purpose is to automatically trigger a re-link (but not a re-compile) of the target when this file
changes.
link_language str, since 0.51.0
Makes the linker for this target be for the specified language. It is generally unnecessary to set
this, as Meson will detect the right linker to use in most cases. There are only two cases where
this is needed. One, your main function in an executable is not in the language Meson picked, or
second you want to force a library to use only one ABI.
(broken until 0.55.0)
link_whole list[lib | custom_tgt | custom_idx], since 0.40.0
Links all contents of the given static libraries whether they are used or not, equivalent to the
`-Wl,--whole-archive` argument flag of GCC, or the ´/WHOLEARCHIVE' MSVC linker option. This allows
the linked target to re-export symbols from all objects in the static libraries.
(since 0.41.0) If passed a list that list will be flattened.
(since 0.51.0) This argument also accepts outputs produced by custom targets. The user must ensure
that the output is a library in the correct format.
link_with list[lib | custom_tgt | custom_idx]
One or more shared or static libraries (built by this project) that this target should be linked
with. (since 0.41.0) If passed a list this list will be flattened. (since 0.51.0) The arguments can
also be custom targets. In this case Meson will assume that merely adding the output file in the
linker command line is sufficient to make linking work. If this is not sufficient, then the build
system writer must write all other steps manually.
name_prefix str | list[void]
The string that will be used as the prefix for the target output filename by overriding the default
(only used for libraries). By default this is `lib` on all platforms and compilers, except for MSVC
shared libraries where it is omitted to follow convention, and Cygwin shared libraries where it is
`cyg`.
Set this to `[]`, or omit the keyword argument for the default behaviour.
name_suffix str | list[void]
The string that will be used as the extension for the target by overriding the default. By default
on Windows this is `exe` for executables and on other platforms it is omitted.
For shared libraries, the default value is `dylib` on macOS, `dll` on Windows, and `so` everywhere
else. For static libraries, it is `a` everywhere. By convention MSVC static libraries use the
`lib` suffix, but we use `a` to avoid a potential name clash with shared libraries which also
generate import libraries with a `lib` suffix.
Set this to `[]`, or omit the keyword argument for the default behaviour.
native bool, default: false
Controls whether the target is compiled for the build or host machines.
objects list[extracted_obj | file | str]
List of object files that should be linked in this target.
Since 1.1.0 this can include generated files in addition to object files that you don't have source
to or that object files produced by other build targets. In earlier release, generated object
files had to be placed in `sources`.
override_options list[str] | dict[str | bool | int | list[str]], since 0.40.0
takes an array of strings in the same format as `project`'s `default_options` overriding the values
of these options for this target only. (since 1.2.0): A dictionary may now be passed.
pic bool, since 0.36.0
Builds the library as positional independent code (so it can be linked into a shared library). This
option has no effect on Windows and OS X since it doesn't make sense on Windows and PIC cannot be
disabled on OS X.
prelink bool, since 0.57.0
If `true` the object files in the target will be prelinked, meaning that it will contain only one
prelinked object file rather than the individual object files.
rust_abi str, since 1.3.0
Set the specific ABI to compile (when compiling rust). - 'rust' (default): Create a "rlib" or
"dylib" crate depending on the library type being build.
- 'c': Create a "cdylib" or "staticlib" crate depending on the library type being build.
rust_crate_type str, deprecated since 1.3.0, since 0.42.0
Set the specific type of rust crate to compile (when compiling rust).
If the target is an executable this defaults to "bin", the only allowed value.
If it is a static_library it defaults to "lib", and may be "lib", "staticlib", or "rlib". If "lib"
then Rustc will pick a default, "staticlib" means a C ABI library, "rlib" means a Rust ABI.
If it is a shared_library it defaults to "lib", and may be "lib", "dylib", "cdylib", or "proc-
macro". If "lib" then Rustc will pick a default, "cdylib" means a C ABI library, "dylib" means a
Rust ABI, and "proc-macro" is a special rust procedural macro crate.
"proc-macro" is new in 0.62.0.
Since 1.3.0 this is deprecated and replaced by "rust_abi" keyword argument. `proc_macro` crates
are now handled by the `rust.proc_macro()`[8] method.
rust_dependency_map dict[str], since 1.2.0
On rust targets this provides a map of library names to the crate name with which it would be
available inside the rust code.
This allows renaming similar to the dependency renaming feature of cargo or `extern crate foo as
bar` inside rust code.
sources str | file | custom_tgt | custom_idx | generated_list | structured_src
Additional source files. Same as the source varargs.
soversion str | int
A string or integer specifying the soversion of this shared library, such as `0`. On Linux and
Windows this is used to set the soversion (or equivalent) in the filename. For example, if
`soversion` is `4`, a Windows DLL will be called `foo-4.dll` and one of the aliases of the Linux
shared library would be `libfoo.so.4`. If this is not specified, the first part of `version` is
used instead (see below). For example, if `version` is `3.6.0` and `soversion` is not defined, it
is set to `3`.
vala_args list[str | file]
Compiler flags for Vala. Unlike other languages this may contain Files
vala_shared_args list[str | file], since 1.3.0
Arguments that are only passed to a shared library Like `vala_args`, files is allowed in addition
to string
vala_static_args list[str | file], since 1.3.0
Arguments that are only passed to a static library Like `vala_args`, files is allowed in addition
to string
version str
A string specifying the version of this shared library, such as `1.1.0`. On Linux and OS X, this is
used to set the shared library version in the filename, such as `libfoo.so.1.1.0` and
`libfoo.1.1.0.dylib`. If this is not specified, `soversion` is used instead (see above).
vs_module_defs str | file | custom_tgt | custom_idx
Specify a Microsoft module definition file for controlling symbol exports, etc., on platforms where
that is possible (e.g. Windows).
(Since 1.3.0) custom_idx are supported
win_subsystem str, default: 'console', since 0.56.0
Specifies the subsystem type to use on the Windows platform. Typical values include `console` for
text mode programs and `windows` for gui apps. The value can also contain version specification
such as `windows,6.0`. See MSDN documentation[9] for the full list.
build_target()
SYNOPSIS
build_tgt build_target(
target_name,
source...,
<lang>_args:,
<lang>_pch:,
<lang>_shared_args:,
<lang>_static_args:,
build_by_default: true,
build_rpath:,
d_debug:,
d_import_dirs:,
d_module_versions:,
d_unittest: false,
darwin_versions:,
dependencies:,
export_dynamic:,
extra_files:,
gnu_symbol_visibility:,
gui_app: false,
implib:,
implicit_include_directories: true,
include_directories:,
install: false,
install_dir:,
install_mode:,
install_rpath:,
install_tag:,
java_resources:,
link_args:,
link_depends:,
link_language:,
link_whole:,
link_with:,
main_class:,
name_prefix:,
name_suffix:,
native: false,
objects:,
override_options:,
pic:,
pie:,
prelink:,
rust_abi:,
rust_crate_type:,
rust_dependency_map:,
sources:,
soversion:,
target_type:,
vala_args:,
vala_shared_args:,
vala_static_args:,
version:,
vs_module_defs:,
win_subsystem: 'console',
)
DESCRIPTION
Creates a build target whose type can be set dynamically with the `target_type` keyword argument.
`target_type` may be set to one of:
- `executable` (see executable)
- `shared_library` (see shared_library)
- `shared_module` (see shared_module)
- `static_library` (see static_library)
- `both_libraries` (see both_libraries)
- `library` (see library)
- `jar` (see jar)*
This declaration:
executable(<arguments and keyword arguments>)
is equivalent to this:
build_target(<arguments and keyword arguments>, target_type : 'executable')
The lists for the kwargs (such as `sources`, `objects`, and `dependencies`) are always flattened,
which means you can freely nest and add lists while creating the final list.
The returned object also has methods that are documented in build_tgt.
*"jar" is deprecated because it is fundementally a different thing than the other build_target types.
POSARGS
target_name str, required
The unique name of the build target
VARARGS
source str | file | custom_tgt | custom_idx | generated_list, 0...N times
Input source to compile. The following types are supported:
- Strings relative to the current source directory
- file objects defined in any preceding build file
- The return value of configure-time generators such as configure_file
- The return value of build-time generators such as custom_target or generator.process
These input files can be sources, objects, libraries, or any other file. Meson will automatically
categorize them based on the extension and use them accordingly. For instance, sources (`.c`,
`.cpp`, `.vala`, `.rs`, etc) will be compiled and objects (`.o`, `.obj`) and libraries (`.so`,
`.dll`, etc) will be linked.
With the Ninja backend, Meson will create a build-time order-only dependency[3] on all generated
input files, including unknown files. This is needed to bootstrap the generation of the real
dependencies in the depfile[4] generated by your compiler to determine when to rebuild sources.
Ninja relies on this dependency file for all input files, generated and non-generated. The
behavior is similar for other backends.
KWARGS
<lang>_args list[str]
compiler flags to use for the given language; eg: `cpp_args` for C++
<lang>_pch str
precompiled header file to use for the given language
<lang>_shared_args list[str], since 1.3.0
Arguments that are only passed to a shared library
<lang>_static_args list[str], since 1.3.0
Arguments that are only passed to a static library
build_by_default bool, default: true, since 0.38.0
Causes, when set to `true`, to have this target be built by default. This means it will be built
when `meson compile` is called without any arguments. The default value is `true` for all built
target types.
build_rpath str, since 0.42.0
A string to add to target's rpath definition in the build dir, but which will be removed on install
d_debug list[str]
The D version identifiers[5] to add during the compilation of D source files.
d_import_dirs list[str]
List of directories to look in for string imports used in the D programming language.
d_module_versions list[str | int]
List of module version identifiers set when compiling D sources.
d_unittest bool, default: false
When set to true, the D modules are compiled in debug mode.
darwin_versions str | int | list[str], since 0.48.0
Defines the `compatibility version` and `current version` for the dylib on macOS. If a list is
specified, it must be either zero, one, or two elements. If only one element is specified or if
it's not a list, the specified value will be used for setting both compatibility version and
current version. If unspecified, the `soversion` will be used as per the aforementioned rules.
dependencies list[dep]
one or more dependency objects created with dependency or compiler.find_library (for external deps)
or declare_dependency (for deps built by the project)
export_dynamic bool, since 0.45.0
when set to true causes the target's symbols to be
dynamically exported, allowing modules built using the
shared_module function to refer to functions,
variables and other symbols defined in the executable itself. Implies
the `implib` argument.
extra_files str | file | custom_tgt | custom_idx
Not used for the build itself but are shown as source files in IDEs that group files by targets
(such as Visual Studio)
gnu_symbol_visibility str, since 0.48.0
Specifies how symbols should be exported, see e.g the GCC Wiki[6] for more information. This value
can either be an empty string or one of `default`, `internal`, `hidden`, `protected` or
`inlineshidden`, which is the same as `hidden` but also includes things like C++ implicit
constructors as specified in the GCC manual. Ignored on compilers that do not support GNU
visibility arguments.
gui_app bool, default: false, deprecated since 0.56.0
When set to true flags this target as a GUI application on platforms where this makes a difference,
deprecated since 0.56.0, use `win_subsystem` instead.
implib bool | str, since 0.42.0
When set to true, an import library is generated for the executable (the name of the import library
is based on exe_name). Alternatively, when set to a string, that gives the base name for the
import library. The import library is used when the returned build target object appears in
`link_with:` elsewhere. Only has any effect on platforms where that is meaningful (e.g. Windows).
Implies the `export_dynamic` argument.
implicit_include_directories bool, default: true, since 0.42.0
Controls whether Meson adds the current source and build directories to the include path
include_directories list[inc | str]
one or more objects created with the include_directories function, or (since 0.50.0) strings, which
will be transparently expanded to include directory objects
install bool, default: false
When set to true, this executable should be installed.
install_dir str
override install directory for this file. If the value is a relative path, it will be considered
relative the `prefix` option. For example, if you want to install plugins into a subdir, you'd use
something like this: `install_dir : get_option('libdir') / 'projectname-1.0'`.
install_mode list[str | int], since 0.47.0
Specify the file mode in symbolic format and optionally the owner/uid and group/gid for the
installed files.
See the `install_mode` kwarg of install_data for more information.
install_rpath str
A string to set the target's rpath to after install (but not before that). On Windows, this
argument has no effect.
install_tag str, since 0.60.0
A string used by the `meson install --tags` command to install only a subset of the files. By
default all build targets have the tag `runtime` except for static libraries that have the `devel`
tag.
java_resources structured_src, since 0.62.0
Resources to be added to the jar
link_args list[str]
Flags to use during linking. You can use UNIX-style flags here for all platforms.
link_depends str | file | custom_tgt | custom_idx
Strings, files, or custom targets the link step depends on such as a symbol visibility map. The
purpose is to automatically trigger a re-link (but not a re-compile) of the target when this file
changes.
link_language str, since 0.51.0
Makes the linker for this target be for the specified language. It is generally unnecessary to set
this, as Meson will detect the right linker to use in most cases. There are only two cases where
this is needed. One, your main function in an executable is not in the language Meson picked, or
second you want to force a library to use only one ABI.
(broken until 0.55.0)
link_whole list[lib | custom_tgt | custom_idx], since 0.40.0
Links all contents of the given static libraries whether they are used or not, equivalent to the
`-Wl,--whole-archive` argument flag of GCC, or the ´/WHOLEARCHIVE' MSVC linker option. This allows
the linked target to re-export symbols from all objects in the static libraries.
(since 0.41.0) If passed a list that list will be flattened.
(since 0.51.0) This argument also accepts outputs produced by custom targets. The user must ensure
that the output is a library in the correct format.
link_with list[lib | custom_tgt | custom_idx]
One or more shared or static libraries (built by this project) that this target should be linked
with. (since 0.41.0) If passed a list this list will be flattened. (since 0.51.0) The arguments can
also be custom targets. In this case Meson will assume that merely adding the output file in the
linker command line is sufficient to make linking work. If this is not sufficient, then the build
system writer must write all other steps manually.
main_class str
Main class for running the built jar
name_prefix str | list[void]
The string that will be used as the prefix for the target output filename by overriding the default
(only used for libraries). By default this is `lib` on all platforms and compilers, except for MSVC
shared libraries where it is omitted to follow convention, and Cygwin shared libraries where it is
`cyg`.
Set this to `[]`, or omit the keyword argument for the default behaviour.
name_suffix str | list[void]
The string that will be used as the extension for the target by overriding the default. By default
on Windows this is `exe` for executables and on other platforms it is omitted.
For shared libraries, the default value is `dylib` on macOS, `dll` on Windows, and `so` everywhere
else. For static libraries, it is `a` everywhere. By convention MSVC static libraries use the
`lib` suffix, but we use `a` to avoid a potential name clash with shared libraries which also
generate import libraries with a `lib` suffix.
Set this to `[]`, or omit the keyword argument for the default behaviour.
native bool, default: false
Controls whether the target is compiled for the build or host machines.
objects list[extracted_obj | file | str]
List of object files that should be linked in this target.
Since 1.1.0 this can include generated files in addition to object files that you don't have source
to or that object files produced by other build targets. In earlier release, generated object
files had to be placed in `sources`.
override_options list[str] | dict[str | bool | int | list[str]], since 0.40.0
takes an array of strings in the same format as `project`'s `default_options` overriding the values
of these options for this target only. (since 1.2.0): A dictionary may now be passed.
pic bool, since 0.36.0
Builds the library as positional independent code (so it can be linked into a shared library). This
option has no effect on Windows and OS X since it doesn't make sense on Windows and PIC cannot be
disabled on OS X.
pie bool, since 0.49.0
Build a position-independent executable.
prelink bool, since 0.57.0
If `true` the object files in the target will be prelinked, meaning that it will contain only one
prelinked object file rather than the individual object files.
rust_abi str, since 1.3.0
Set the specific ABI to compile (when compiling rust). - 'rust' (default): Create a "rlib" or
"dylib" crate depending on the library type being build.
- 'c': Create a "cdylib" or "staticlib" crate depending on the library type being build.
rust_crate_type str, deprecated since 1.3.0, since 0.42.0
Set the specific type of rust crate to compile (when compiling rust).
If the target is an executable this defaults to "bin", the only allowed value.
If it is a static_library it defaults to "lib", and may be "lib", "staticlib", or "rlib". If "lib"
then Rustc will pick a default, "staticlib" means a C ABI library, "rlib" means a Rust ABI.
If it is a shared_library it defaults to "lib", and may be "lib", "dylib", "cdylib", or "proc-
macro". If "lib" then Rustc will pick a default, "cdylib" means a C ABI library, "dylib" means a
Rust ABI, and "proc-macro" is a special rust procedural macro crate.
"proc-macro" is new in 0.62.0.
Since 1.3.0 this is deprecated and replaced by "rust_abi" keyword argument. `proc_macro` crates
are now handled by the `rust.proc_macro()`[7] method.
rust_dependency_map dict[str], since 1.2.0
On rust targets this provides a map of library names to the crate name with which it would be
available inside the rust code.
This allows renaming similar to the dependency renaming feature of cargo or `extern crate foo as
bar` inside rust code.
sources str | file | custom_tgt | custom_idx | generated_list | structured_src
Additional source files. Same as the source varargs.
soversion str | int
A string or integer specifying the soversion of this shared library, such as `0`. On Linux and
Windows this is used to set the soversion (or equivalent) in the filename. For example, if
`soversion` is `4`, a Windows DLL will be called `foo-4.dll` and one of the aliases of the Linux
shared library would be `libfoo.so.4`. If this is not specified, the first part of `version` is
used instead (see below). For example, if `version` is `3.6.0` and `soversion` is not defined, it
is set to `3`.
target_type str
The actual target type to build
vala_args list[str | file]
Compiler flags for Vala. Unlike other languages this may contain Files
vala_shared_args list[str | file], since 1.3.0
Arguments that are only passed to a shared library Like `vala_args`, files is allowed in addition
to string
vala_static_args list[str | file], since 1.3.0
Arguments that are only passed to a static library Like `vala_args`, files is allowed in addition
to string
version str
A string specifying the version of this shared library, such as `1.1.0`. On Linux and OS X, this is
used to set the shared library version in the filename, such as `libfoo.so.1.1.0` and
`libfoo.1.1.0.dylib`. If this is not specified, `soversion` is used instead (see above).
vs_module_defs str | file | custom_tgt | custom_idx, since 1.3.0
Specify a Microsoft module definition file for controlling symbol exports, etc., on platforms where
that is possible (e.g. Windows).
This can be used to expose which functions a shared_module loaded by an executable will be allowed
to use.
win_subsystem str, default: 'console', since 0.56.0
Specifies the subsystem type to use on the Windows platform. Typical values include `console` for
text mode programs and `windows` for gui apps. The value can also contain version specification
such as `windows,6.0`. See MSDN documentation[8] for the full list.
configuration_data()
SYNOPSIS
cfg_data configuration_data([data])
DESCRIPTION
Creates an empty configuration object. You should add your configuration with the cfg_data method
calls and finally use it in a call to configure_file.
OPTARGS
data dict[str | bool | int], since 0.49.0
Optional dictionary to specify an initial data set. If provided, each key/value pair is added into
the cfg_data object as if the cfg_data.set method was called for each of them.
configure_file()
SYNOPSIS
file configure_file(
capture: false,
command:,
configuration:,
copy: false,
depfile:,
encoding: 'utf-8',
format: 'meson',
input:,
install: false,
install_dir:,
install_mode:,
install_tag:,
macro_name:,
output:,
output_format:,
)
DESCRIPTION
This function can run in three modes depending on the keyword arguments passed to it.
When a cfg_data object is passed to the `configuration:` keyword argument, it takes a template file
as the `input:` (optional) and produces the `output:` (required) by substituting values from the
configuration data as detailed in the configuration file documentation[10]. (since 0.49.0) A
dictionary can be passed instead of a cfg_data object.
When a list of strings is passed to the `command:` keyword argument, it takes any source or
configured file as the `input:` and assumes that the `output:` is produced when the specified command
is run.
(since 0.47.0) When the `copy:` keyword argument is set to `true`, this function will copy the file
provided in `input:` to a file in the build directory with the name `output:` in the current
directory.
KWARGS
capture bool, default: false, since 0.41.0
When this argument is set to true, Meson captures `stdout` of the `command` and writes it to the
target file specified as `output`.
command list[str | file | compiler | external_program | exe]
As explained above, if specified, Meson does not create the file itself but rather runs the
specified command, which allows you to do fully custom file generation. (since 0.52.0) The command
can contain file objects and more than one file can be passed to the `input` keyword argument, see
custom_target for details about string substitutions.
configuration cfg_data | dict[str | int | bool]
As explained above, when passed this will provide the replacement data for the input file (if
provided) or key value pairs to be written to the output.
copy bool, default: false, since 0.47.0
As explained above, if specified Meson only copies the file from input to output.
depfile str, since 0.52.0
A dependency file that the command can write listing all the additional files this target depends
on. A change in any one of these files triggers a reconfiguration.
encoding str, default: 'utf-8', since 0.47.0
Set the file encoding for the input and output file. The supported encodings are those of python3,
see standard-encodings[11].
format str, default: 'meson', since 0.46.0
The format of defines. It defaults to `'meson'`, and so substitutes `#mesondefine` statements and
variables surrounded by `@` characters, you can also use `'cmake'` to replace `#cmakedefine`
statements and variables with the `${variable}` syntax. Finally you can use `'cmake@'` in which
case substitutions will apply on `#cmakedefine` statements and variables with the `@variable@`
syntax.
input str | file
The input file name. If it's not specified in configuration mode, all the variables in the
`configuration:` object (see above) are written to the `output:` file.
install bool, default: false, since 0.50.0
When true, this generated file is installed during the install step, and `install_dir` must be set
and not empty. When false, this generated file is not installed regardless of the value of
`install_dir`. When omitted it defaults to true when `install_dir` is set and not empty, false
otherwise.
install_dir str | bool
The subdirectory to install the generated file to (e.g. `share/myproject`), if omitted or given the
value of empty string, the file is not installed.
install_mode list[str | int | bool], since 0.47.0
Specify the file mode in symbolic format and optionally the owner/uid and group/gid for the
installed files.
See the `install_mode` kwarg of install_data for more information.
install_tag str, since 0.60.0
A string used by the `meson install --tags` command to install only a subset of the files. By
default the file has no install tag which means it is not being installed when `--tags` argument is
specified.
macro_name str, since 1.3.0
When specified, macro guards will be used instead of '#pragma once'. The macro guard name will be
the specified name.
output str
The output file name. (since 0.41.0) may contain `@PLAINNAME@` or `@BASENAME@` substitutions, as
well as (since 1.5.0) their indexed versions, like `@PLAINNAME0@` or `@BASENAME0@`. In
configuration mode, the permissions of the input file (if it is specified) are copied to the output
file.
output_format str, since 0.47.0
The format of the output to generate when no input was specified. It defaults to `c`, in which case
preprocessor directives will be prefixed with `#`, you can also use `nasm`, in which case the
prefix will be `%`. (since 1.3.0) `json` format can also be used.
WARNINGS
the `install_mode` kwarg ignored integer values between 0.62 -- 1.1.0.
custom_target()
SYNOPSIS
custom_tgt custom_target(
[name],
build_always:,
build_always_stale: false,
build_by_default:,
capture: false,
command:,
console:,
depend_files:,
depends:,
depfile:,
env:,
feed: false,
input:,
install:,
install_dir:,
install_mode:,
install_tag:,
output:,
)
DESCRIPTION
Create a custom top level build target. The only positional argument is the name of this target and
cannot contain path separators (`/` or ``). The name of custom target might not be used by every
backends, for instance with the Ninja backend, `subdir/meson.build` containing the example below,
`ninja -C builddir foo` or `ninja -C builddir subdir/foo` won't work, it is instead `ninja -C
builddir subdir/file.txt`. However, `meson compile subdir/foo` is accepted.
custom_target('foo', output: 'file.txt', ...)
Since 0.60.0 the name argument is optional and defaults to the basename of the first output
(`file.txt` in the example above).
The list of strings passed to the `command` keyword argument accept the following special string
substitutions:
- `@INPUT@`: the full path to the input passed to `input`. If more than one input is specified, all
of them will be substituted as separate arguments only if the command uses `'@INPUT@'` as a
standalone-argument. For instance, this would not work: `command : ['cp', './@INPUT@']`, but this
would: `command : ['cp', '@INPUT@']`.
- `@OUTPUT@`: the full path to the output passed to `output`. If more than one outputs are specified,
the behavior is the same as `@INPUT@`.
- `@INPUT0@` `@INPUT1@` `...`: the full path to the input with the specified array index in `input`
- `@OUTPUT0@` `@OUTPUT1@` `...`: the full path to the output with the specified array index in
`output`
- `@OUTDIR@`: the full path to the directory where the output(s) must be written
- `@DEPFILE@`: the full path to the dependency file passed to `depfile`
- `@PLAINNAME@`: the input filename, without a path
- `@PLAINNAME0@` `@PLAINNAME1@` `...` (since 1.5.0): the input filename without a path, with the
specified array index in `input`
- `@BASENAME@`: the input filename, with extension removed
- `@BASENAME0@` `@BASENAME1@` `...` (since 1.5.0): the input filename with extension removed, with
the specified array index in `input`
- `@PRIVATE_DIR@` (since 0.50.1): path to a directory where the custom target must store all its
intermediate files.
- `@SOURCE_ROOT@`: the path to the root of the source tree. Depending on the backend, this may be an
absolute or a relative to current workdir path.
- `@BUILD_ROOT@`: the path to the root of the build tree. Depending on the backend, this may be an
absolute or a relative to current workdir path.
- `@CURRENT_SOURCE_DIR@`: this is the directory where the currently processed meson.build is located
in. Depending on the backend, this may be an absolute or a relative to current workdir path.
(since 0.47.0) The `depfile` keyword argument also accepts the `@BASENAME@` and `@PLAINNAME@`
substitutions.
The returned object also has methods that are documented in custom_tgt.
OPTARGS
name str
The unique id of the custom target
This posarg is optional since 0.60.0. It defaults to the basename of the first output.
KWARGS
build_always bool, deprecated since 0.47.0
If `true` this target is always considered out of date and is rebuilt every time. Equivalent to
setting both `build_always_stale` and `build_by_default` to true.
build_always_stale bool, default: false, since 0.47.0
If `true` the target is always considered out of date. Useful for things such as build timestamps
or revision control tags. The associated command is run even if the outputs are up to date.
build_by_default bool, since 0.38.0
Causes, when set to true, to have this target be built by default. This means it will be built when
`meson compile` is called without any arguments. The default value is `false`.
(since 0.50.0) If `build_by_default` is explicitly set to false, `install` will no longer override
it. If `build_by_default` is not set, `install` will still determine its default.
capture bool, default: false
There are some compilers that can't be told to write their output to a file but instead write it to
standard output. When this argument is set to true, Meson captures `stdout` and writes it to the
target file. Note that your command argument list may not contain `@OUTPUT@` when capture mode is
active.
command list[str | file | exe | external_program | custom_tgt | build_tgt | custom_idx]
Command to run to create outputs from inputs. The command may be strings or the return value of
functions that return file-like objects such as find_program, executable, configure_file, files,
custom_target, etc. Meson will automatically insert the appropriate dependencies on targets and
files listed in this keyword argument. Note: always specify commands in array form
`['commandname', ´-arg1', '-arg2']` rather than as a string `'commandname -arg1 -arg2'` as the
latter will not work.
console bool, since 0.48.0
Keyword argument conflicts with `capture`, and is meant for commands that are resource-intensive
and take a long time to finish. With the Ninja backend, setting this will add this target to
Ninja's `console` pool[12], which has special properties such as not buffering stdout and
serializing all targets in this pool.
depend_files list[str | file]
files (str, file, or the return value of configure_file that this target depends on but are not
listed in the `command` keyword argument. Useful for adding regen dependencies.
depends list[build_tgt | custom_tgt | custom_idx]
Specifies that this target depends on the specified target(s), even though it does not take any of
them as a command line argument. This is meant for cases where you have a tool that e.g. does
globbing internally. Usually you should just put the generated sources as inputs and Meson will set
up all dependencies automatically (custom_idx was unavailable as a type between 0.60 and 1.4.0).
depfile str
A dependency file that the command can write listing all the additional files this target depends
on, for example a C compiler would list all the header files it included, and a change in any one
of these files triggers a recompilation.
(since 0.47.0) the `@BASENAME@` and `@PLAINNAME@` substitutions are also accepted.
env env | list[str] | dict[str], since 0.57.0
environment variables to set, such as `{'NAME1': 'value1', 'NAME2': 'value2'}` or `['NAME1=value1',
'NAME2=value2']`, or an env object which allows more sophisticated environment juggling.
feed bool, default: false, since 0.59.0
There are some compilers that can't be told to read their input from a file and instead read it
from standard input. When this argument is set to `true`, Meson feeds the input file to `stdin`.
Note that your argument list may not contain `@INPUT@` when feed mode is active.
input list[str | file | build_tgt | custom_idx | custom_tgt | external_program | extracted_obj |
generated_list]
List of source files. (since 0.41.0) the list is flattened.
install bool
When true, one or more files of this target are installed during the install step (see
`install_dir` for details).
install_dir bool | str | list[bool | str]
If only one install_dir is provided, all outputs are installed there. Since 0.40.0 Allows you to
specify the installation directory for each corresponding output. For example:
custom_target('different-install-dirs',
output : ['first.file', 'second.file'],
install : true,
install_dir : ['somedir', 'otherdir'])
This would install `first.file` to `somedir` and `second.file` to `otherdir`.
To only install some outputs, pass `false` for the outputs that you don't want installed. For
example:
custom_target('only-install-second',
output : ['first.file', 'second.file'],
install : true,
install_dir : [false, 'otherdir'])
This would install `second.file` to `otherdir` and not install `first.file`.
install_mode list[str | int | bool], since 0.47.0
The file mode and optionally the owner/uid and group/gid. See the `install_mode` kwarg of
install_data for more information.
install_tag list[str | bool], since 0.60.0
A list of strings, one per output, used by the `meson install --tags` command to install only a
subset of the files.
By default all outputs have no install tag which means they are not being installed when `--tags`
argument is specified. If only one tag is specified, it is assumed that all outputs have the same
tag. `false` can be used for outputs that have no tag or are not installed.
output list[str]
List of output files.
NOTES
Assuming that `command:` is executed by a POSIX `sh` shell is not portable, notably to Windows.
Instead, consider using a `native: true` executable, or a python script.
WARNINGS
the `install_mode` kwarg ignored integer values between 0.60.0 -- 1.1.0.
debug()
SYNOPSIS
void debug(message, msg...)
since 0.63.0
DESCRIPTION
Write the argument string to the meson build log.
POSARGS
message str | int | bool | list[str | int | bool] | dict[str | int | bool], required
The message to print
VARARGS
msg str | int | bool | list[str | int | bool] | dict[str | int | bool], 0...N times
Additional parameters will be separated by spaces
declare_dependency()
SYNOPSIS
dep declare_dependency(
compile_args:,
d_import_dirs:,
d_module_versions:,
dependencies:,
extra_files:,
include_directories:,
link_args:,
link_whole:,
link_with:,
objects:,
sources:,
variables:,
version:,
)
DESCRIPTION
This function returns a dep object that behaves like the return value of dependency but is internal
to the current build. The main use case for this is in subprojects. This allows a subproject to
easily specify how it should be used. This makes it interchangeable with the same dependency that is
provided externally by the system.
KWARGS
compile_args list[str]
Compile arguments to use.
d_import_dirs list[inc | str], since 0.62.0
the directories to add to the string search path (i.e. `-J` switch for DMD). Must be inc objects
or plain strings.
d_module_versions str | int | list[str | int], since 0.62.0
The D version identifiers[5] to add during the compilation of D source files.
dependencies list[dep]
Other dependencies needed to use this dependency.
extra_files list[str | file], since 1.2.0
extra files to add to targets. mostly used for IDE integration.
include_directories list[inc | str]
the directories to add to header search path, must be inc objects or (since 0.50.0) plain strings.
link_args list[str]
Link arguments to use.
link_whole list[lib], since 0.46.0
Libraries to link fully, same as executable.
link_with list[lib]
Libraries to link against.
objects list[extracted_obj], since 1.1.0
a list of object files, to be linked directly into the targets that use the dependency.
sources list[str | file | custom_tgt | custom_idx | generated_list]
sources to add to targets (or generated header files that should be built before sources including
them are built)
variables dict[str] | list[str], since 0.54.0
a dictionary of arbitrary strings, this is meant to be used in subprojects where special variables
would be provided via cmake or pkg-config. since 0.56.0 it can also be a list of `'key=value'`
strings.
version str
the version of this dependency, such as `1.2.3`. Defaults to the project version.
dependency()
SYNOPSIS
dep dependency(
names...,
allow_fallback:,
default_options:,
disabler: false,
fallback:,
include_type: 'preserve',
language:,
method: 'auto',
native: false,
not_found_message:,
required: true,
static: false,
version:,
)
DESCRIPTION
Finds an external dependency (usually a library installed on your system) with the given name with
`pkg-config` and with CMake[13] if `pkg-config` fails. Additionally, frameworks (OSX only) and
library-specific fallback detection logic[14] are also supported.
Since 0.60.0 more than one name can be provided, they will be tried in order and the first name to be
found will be used. The fallback subproject will be used only if none of the names are found on the
system. Once one of the name has been found, all other names are added into the cache so subsequent
calls for any of those name will return the same value. This is useful in case a dependency could
have different names, such as `png` and `libpng`.
Since 0.64.0* a dependency fallback can be provided by WrapDB. Simply download the database locally
using `meson wrap update-db` command and Meson will automatically fallback to subprojects provided by
WrapDB if the dependency is not found on the system and the project does not ship their own `.wrap`
file.
Dependencies can also be resolved in two other ways:
* if the same name was used in a `meson.override_dependency` prior to the call to `dependency`, the
overriding dependency will be returned unconditionally; that is, the overriding dependency will be
used independent of whether an external dependency is installed in the system. Typically,
`meson.override_dependency` will have been used by a subproject.
* by a fallback subproject which, if needed, will be brought into the current build specification as
if `subproject()` had been called. The subproject can be specified with the `fallback` argument.
Alternatively, if the `fallback` argument is absent, since 0.55.0 Meson can automatically identify a
subproject as a fallback if a wrap file provides[15] the dependency, or if a subproject has the same
name as the dependency. In the latter case, the subproject must use `meson.override_dependency` to
specify the replacement, or Meson will report a hard error. See the Wrap documentation[14] for more
details. This automatic search can be controlled using the `allow_fallback` keyword argument.
If `dependency_name` is `''`, the dependency is always not found. So with `required: false`, this
always returns a dependency object for which the `found()` method returns `false`, and which can be
passed like any other dependency to the `dependencies:` keyword argument of a `build_target`. This
can be used to implement a dependency which is sometimes not required e.g. in some branches of a
conditional, or with a `fallback:` kwarg, can be used to declare an optional dependency that only
looks in the specified subproject, and only if that's allowed by `--wrap-mode`.
The returned object dep also has additional methods.
VARARGS
names str, 1...N times, since 0.60.0
The names of the dependency to look up. The dependencies are looked up in the order they are
provided here. The first found dependency will then be used. The fallback subproject will be used
only if none of the names are found on the system. Once one of the name has been found, all other
names are added into the cache so subsequent calls for any of those name will return the same
value. This is useful in case a dependency could have different names, such as `png` and `libpng`.
NOTE: Before 0.60.0 only a single dependency name was allowed.
KWARGS
allow_fallback bool, since 0.56.0
Specifies whether Meson should automatically pick a fallback subproject in case the dependency is
not found in the system. If `true` and the dependency is not found on the system, Meson will
fallback to a subproject that provides this dependency. If `false`, Meson will not fallback even if
a subproject provides this dependency. By default, Meson will do so if `required` is `true` or
`enabled`[0]; see the Wrap documentation[14] for more details.
default_options list[str] | dict[str | bool | int | list[str]], since 0.38.0
An array of default option values that override those set in the subproject's `meson.options` (like
`default_options` in project, they only have effect when Meson is run for the first time, and
command line arguments override any default options in build files) (since 1.2.0): A dictionary may
now be passed.
disabler bool, default: false, since 0.49.0
Returns a disabler object instead of a not-found dependency if this kwarg is set to `true` and the
dependency couldn't be found.
fallback list[str] | str
Manually specifies a subproject fallback to use in case the dependency is not found in the system.
This is useful if the automatic search is not applicable or if you want to support versions of
Meson older than 0.55.0. If the value is an array `['subproj_name', 'subproj_dep']`, the first
value is the name of the subproject and the second is the variable name in that subproject that
contains a dependency object such as the return value of declare_dependency or dependency, etc.
Note that this means the fallback dependency may be a not-found dependency, in which case the value
of the `required:` kwarg will be obeyed. Since 0.54.0 the value can be a single string, the
subproject name; in this case the subproject must use `meson.override_dependency('dependency_name',
subproj_dep)` to specify the dependency object used in the superproject. If the value is an empty
list, it has the same effect as `allow_fallback: false`.
include_type str, default: 'preserve', since 0.52.0
An enum flag, marking how the dependency flags should be converted. Supported values are
`'preserve'`, `'system'` and `'non-system'`. System dependencies may be handled differently on some
platforms, for instance, using `-isystem` instead of `-I`, where possible. If `include_type` is
set to `'preserve'`, no additional conversion will be performed.
language str, since 0.42.0
Defines what language-specific dependency to find if it's available for multiple languages.
method str, default: 'auto', since 0.40.0
Defines the way the dependency is detected, the default is `auto` but can be overridden to be e.g.
`qmake` for Qt development, and different dependencies support different values[16] for this
(though `auto` will work on all of them)
native bool, default: false
If set to `true`, causes Meson to find the dependency on the build machine system rather than the
host system (i.e. where the cross compiled binary will run on), usually only needed if you build a
tool to be used during compilation.
not_found_message str, since 0.50.0
An optional string that will be printed as a message if the dependency was not found.
required bool | feature, default: true
When set to `false`, Meson will proceed with the build even if the dependency is not found.
When set to a `feature`[0] option, the feature will control if it is searched and whether to fail
if not found.
(since 0.47.0) The value of a `feature` option can also be passed.
static bool, default: false
Tells the dependency provider to try to get static libraries instead of dynamic ones (note that
this is not supported by all dependency backends)
Since 0.60.0 it also sets `default_library` option accordingly on the fallback subproject if it was
not set explicitly in `default_options` keyword argument.
version list[str] | str, since 0.37.0
Specifies the required version, a string containing a comparison operator followed by the version
string, examples include `>1.0.0`, `<=2.3.5` or `3.1.4` for exact matching. You can also specify
multiple restrictions by passing a list to this keyword argument, such as: `['>=3.14.0',
'<=4.1.0']`. These requirements are never met if the version is unknown.
NOTES
This function supports additional library-specific[13] keyword arguments that may also be accepted
(e.g. `modules` specifies submodules to use for dependencies such as Qt5 or Boost. `components`
allows the user to manually add CMake `COMPONENTS` for the `find_package` lookup)
disabler()
SYNOPSIS
disabler disabler()
since 0.44.0
DESCRIPTION
Returns a disabler object.
environment()
SYNOPSIS
env environment([env], method:, separator:)
since 0.35.0
DESCRIPTION
Returns an empty env object.
OPTARGS
env str | list[str] | dict[str] | dict[list[str]], since 0.52.0
If provided, each key/value pair is added into the env object as if env.set method was called for
each of them. Since 0.62.0 list of strings is allowed in dictionary values. In that case values
are joined using the separator.
KWARGS
method str, since 0.62.0
Must be one of 'set', 'prepend', or 'append' (defaults to 'set'). Controls if initial values
defined in the first positional argument are prepended, appended or replace the current value of
the environment variable.
separator str, since 0.62.0
The separator to use for the initial values defined in the first positional argument. If not
explicitly specified, the default path separator for the host operating system will be used, i.e.
';' for Windows and ':' for UNIX/POSIX systems.
error()
SYNOPSIS
void error(message, msg...)
DESCRIPTION
Print the argument string and halts the build process.
POSARGS
message str, required
The message to print
VARARGS
msg str, 0...N times, since 0.58.0
Additional parameters will be separated by spaces
executable()
SYNOPSIS
exe executable(
target_name,
source...,
<lang>_args:,
<lang>_pch:,
build_by_default: true,
build_rpath:,
d_debug:,
d_import_dirs:,
d_module_versions:,
d_unittest: false,
dependencies:,
export_dynamic:,
extra_files:,
gnu_symbol_visibility:,
gui_app: false,
implib:,
implicit_include_directories: true,
include_directories:,
install: false,
install_dir:,
install_mode:,
install_rpath:,
install_tag:,
link_args:,
link_depends:,
link_language:,
link_whole:,
link_with:,
name_prefix:,
name_suffix:,
native: false,
objects:,
override_options:,
pie:,
rust_crate_type:,
rust_dependency_map:,
sources:,
vala_args:,
vs_module_defs:,
win_subsystem: 'console',
)
DESCRIPTION
Creates a new executable. The first argument specifies its name and the remaining positional
arguments define the input files to use.
The lists for the kwargs (such as `sources`, `objects`, and `dependencies`) are always flattened,
which means you can freely nest and add lists while creating the final list.
The returned object also has methods that are documented in exe.
Since 1.3.0 executable names can be the same across multiple targets as long as they each have a
different `name_suffix`.
POSARGS
target_name str, required
The unique name of the build target
VARARGS
source str | file | custom_tgt | custom_idx | generated_list, 0...N times
Input source to compile. The following types are supported:
- Strings relative to the current source directory
- file objects defined in any preceding build file
- The return value of configure-time generators such as configure_file
- The return value of build-time generators such as custom_target or generator.process
These input files can be sources, objects, libraries, or any other file. Meson will automatically
categorize them based on the extension and use them accordingly. For instance, sources (`.c`,
`.cpp`, `.vala`, `.rs`, etc) will be compiled and objects (`.o`, `.obj`) and libraries (`.so`,
`.dll`, etc) will be linked.
With the Ninja backend, Meson will create a build-time order-only dependency[3] on all generated
input files, including unknown files. This is needed to bootstrap the generation of the real
dependencies in the depfile[4] generated by your compiler to determine when to rebuild sources.
Ninja relies on this dependency file for all input files, generated and non-generated. The
behavior is similar for other backends.
KWARGS
<lang>_args list[str]
compiler flags to use for the given language; eg: `cpp_args` for C++
<lang>_pch str
precompiled header file to use for the given language
build_by_default bool, default: true, since 0.38.0
Causes, when set to `true`, to have this target be built by default. This means it will be built
when `meson compile` is called without any arguments. The default value is `true` for all built
target types.
build_rpath str, since 0.42.0
A string to add to target's rpath definition in the build dir, but which will be removed on install
d_debug list[str]
The D version identifiers[5] to add during the compilation of D source files.
d_import_dirs list[str]
List of directories to look in for string imports used in the D programming language.
d_module_versions list[str | int]
List of module version identifiers set when compiling D sources.
d_unittest bool, default: false
When set to true, the D modules are compiled in debug mode.
dependencies list[dep]
one or more dependency objects created with dependency or compiler.find_library (for external deps)
or declare_dependency (for deps built by the project)
export_dynamic bool, since 0.45.0
when set to true causes the target's symbols to be
dynamically exported, allowing modules built using the
shared_module function to refer to functions,
variables and other symbols defined in the executable itself. Implies
the `implib` argument.
extra_files str | file | custom_tgt | custom_idx
Not used for the build itself but are shown as source files in IDEs that group files by targets
(such as Visual Studio)
gnu_symbol_visibility str, since 0.48.0
Specifies how symbols should be exported, see e.g the GCC Wiki[6] for more information. This value
can either be an empty string or one of `default`, `internal`, `hidden`, `protected` or
`inlineshidden`, which is the same as `hidden` but also includes things like C++ implicit
constructors as specified in the GCC manual. Ignored on compilers that do not support GNU
visibility arguments.
gui_app bool, default: false, deprecated since 0.56.0
When set to true flags this target as a GUI application on platforms where this makes a difference,
deprecated since 0.56.0, use `win_subsystem` instead.
implib bool | str, since 0.42.0
When set to true, an import library is generated for the executable (the name of the import library
is based on exe_name). Alternatively, when set to a string, that gives the base name for the
import library. The import library is used when the returned build target object appears in
`link_with:` elsewhere. Only has any effect on platforms where that is meaningful (e.g. Windows).
Implies the `export_dynamic` argument.
implicit_include_directories bool, default: true, since 0.42.0
Controls whether Meson adds the current source and build directories to the include path
include_directories list[inc | str]
one or more objects created with the include_directories function, or (since 0.50.0) strings, which
will be transparently expanded to include directory objects
install bool, default: false
When set to true, this executable should be installed.
install_dir str
override install directory for this file. If the value is a relative path, it will be considered
relative the `prefix` option. For example, if you want to install plugins into a subdir, you'd use
something like this: `install_dir : get_option('libdir') / 'projectname-1.0'`.
install_mode list[str | int], since 0.47.0
Specify the file mode in symbolic format and optionally the owner/uid and group/gid for the
installed files.
See the `install_mode` kwarg of install_data for more information.
install_rpath str
A string to set the target's rpath to after install (but not before that). On Windows, this
argument has no effect.
install_tag str, since 0.60.0
A string used by the `meson install --tags` command to install only a subset of the files. By
default all build targets have the tag `runtime` except for static libraries that have the `devel`
tag.
link_args list[str]
Flags to use during linking. You can use UNIX-style flags here for all platforms.
link_depends str | file | custom_tgt | custom_idx
Strings, files, or custom targets the link step depends on such as a symbol visibility map. The
purpose is to automatically trigger a re-link (but not a re-compile) of the target when this file
changes.
link_language str, since 0.51.0
Makes the linker for this target be for the specified language. It is generally unnecessary to set
this, as Meson will detect the right linker to use in most cases. There are only two cases where
this is needed. One, your main function in an executable is not in the language Meson picked, or
second you want to force a library to use only one ABI.
(broken until 0.55.0)
link_whole list[lib | custom_tgt | custom_idx], since 0.40.0
Links all contents of the given static libraries whether they are used or not, equivalent to the
`-Wl,--whole-archive` argument flag of GCC, or the ´/WHOLEARCHIVE' MSVC linker option. This allows
the linked target to re-export symbols from all objects in the static libraries.
(since 0.41.0) If passed a list that list will be flattened.
(since 0.51.0) This argument also accepts outputs produced by custom targets. The user must ensure
that the output is a library in the correct format.
link_with list[lib | custom_tgt | custom_idx]
One or more shared or static libraries (built by this project) that this target should be linked
with. (since 0.41.0) If passed a list this list will be flattened. (since 0.51.0) The arguments can
also be custom targets. In this case Meson will assume that merely adding the output file in the
linker command line is sufficient to make linking work. If this is not sufficient, then the build
system writer must write all other steps manually.
name_prefix str | list[void]
The string that will be used as the prefix for the target output filename by overriding the default
(only used for libraries). By default this is `lib` on all platforms and compilers, except for MSVC
shared libraries where it is omitted to follow convention, and Cygwin shared libraries where it is
`cyg`.
Set this to `[]`, or omit the keyword argument for the default behaviour.
name_suffix str | list[void]
The string that will be used as the extension for the target by overriding the default. By default
on Windows this is `exe` for executables and on other platforms it is omitted.
For shared libraries, the default value is `dylib` on macOS, `dll` on Windows, and `so` everywhere
else. For static libraries, it is `a` everywhere. By convention MSVC static libraries use the
`lib` suffix, but we use `a` to avoid a potential name clash with shared libraries which also
generate import libraries with a `lib` suffix.
Set this to `[]`, or omit the keyword argument for the default behaviour.
native bool, default: false
Controls whether the target is compiled for the build or host machines.
objects list[extracted_obj | file | str]
List of object files that should be linked in this target.
Since 1.1.0 this can include generated files in addition to object files that you don't have source
to or that object files produced by other build targets. In earlier release, generated object
files had to be placed in `sources`.
override_options list[str] | dict[str | bool | int | list[str]], since 0.40.0
takes an array of strings in the same format as `project`'s `default_options` overriding the values
of these options for this target only. (since 1.2.0): A dictionary may now be passed.
pie bool, since 0.49.0
Build a position-independent executable.
rust_crate_type str, deprecated since 1.3.0, since 0.42.0
Set the specific type of rust crate to compile (when compiling rust).
If the target is an executable this defaults to "bin", the only allowed value.
If it is a static_library it defaults to "lib", and may be "lib", "staticlib", or "rlib". If "lib"
then Rustc will pick a default, "staticlib" means a C ABI library, "rlib" means a Rust ABI.
If it is a shared_library it defaults to "lib", and may be "lib", "dylib", "cdylib", or "proc-
macro". If "lib" then Rustc will pick a default, "cdylib" means a C ABI library, "dylib" means a
Rust ABI, and "proc-macro" is a special rust procedural macro crate.
"proc-macro" is new in 0.62.0.
Since 1.3.0 this is deprecated and replaced by "rust_abi" keyword argument. `proc_macro` crates
are now handled by the `rust.proc_macro()`[7] method.
rust_dependency_map dict[str], since 1.2.0
On rust targets this provides a map of library names to the crate name with which it would be
available inside the rust code.
This allows renaming similar to the dependency renaming feature of cargo or `extern crate foo as
bar` inside rust code.
sources str | file | custom_tgt | custom_idx | generated_list | structured_src
Additional source files. Same as the source varargs.
vala_args list[str | file]
Compiler flags for Vala. Unlike other languages this may contain Files
vs_module_defs str | file | custom_tgt | custom_idx, since 1.3.0
Specify a Microsoft module definition file for controlling symbol exports, etc., on platforms where
that is possible (e.g. Windows).
This can be used to expose which functions a shared_module loaded by an executable will be allowed
to use.
win_subsystem str, default: 'console', since 0.56.0
Specifies the subsystem type to use on the Windows platform. Typical values include `console` for
text mode programs and `windows` for gui apps. The value can also contain version specification
such as `windows,6.0`. See MSDN documentation[8] for the full list.
WARNINGS
The `link_language` kwarg was broken until 0.55.0
files()
SYNOPSIS
list[file] files(file...)
DESCRIPTION
This command takes the strings given to it in arguments and returns corresponding File objects that
you can use as sources for build targets. The difference is that file objects remember the
subdirectory they were defined in and can be used anywhere in the source tree.
VARARGS
file str, 0...N times
Path to the file.
EXAMPLE
As an example suppose you have source file `foo.cpp` in subdirectory `bar1` and you would like to use
it in a build target that is defined in `bar2`. To make this happen you first create the object in
`bar1` like this:
foofile = files('foo.cpp')
Then you can use it in `bar2` like this:
executable('myprog', 'myprog.cpp', foofile, ...)
Meson will then do the right thing.
find_program()
SYNOPSIS
external_program | exe find_program(
program_name,
fallback...,
default_options:,
dirs:,
disabler: false,
native: false,
required: true,
version:,
version_argument:,
)
DESCRIPTION
`program_name` here is a string that can be an executable or script to be searched for in `PATH` or
other places inside the project. The search order is:
1. Program overrides set via meson.override_find_program 1. `[provide]` sections[14]
in subproject wrap files, if `wrap_mode`[17] is
set to `forcefallback` 1. `[binaries]` section[18] in your machine files 1. Directories provided
using the `dirs:` kwarg (see below) 1. Project's source tree relative to the current subdir
- If you use the return value of configure_file, the
current subdir inside the build tree is used instead 1. `PATH` environment variable 1.
`[provide]` sections[14] in
subproject wrap files, if `wrap_mode`[16] is
set to anything other than `nofallback`
Meson will also autodetect scripts with a shebang line and run them with the executable/interpreter
specified in it both on Windows (because the command invocator will reject the command otherwise) and
Unixes (if the script file does not have the executable bit set). Hence, you must not manually add
the interpreter while using this script as part of a list of commands. Since 0.50.0 if the "python3"
program is requested and it is not found in the system, Meson will return its current interpreter.
If you need to check for a program in a non-standard location, you can just pass an absolute path to
`find_program`, e.g.
setcap = find_program('setcap', '/usr/sbin/setcap', '/sbin/setcap', required : false)
It is also possible to pass an array to `find_program` in case you need to construct the set of paths
to search on the fly:
setcap = find_program(['setcap', '/usr/sbin/setcap', '/sbin/setcap'], required : false)
Since 1.2.0 `find_program('meson')` is automatically overridden to the Meson command used to execute
the build script.
The returned external_program object also has documented methods.
POSARGS
program_name str | file, required
The name of the program to search, or a file object to be used without searching.
VARARGS
fallback str | file, 0...N times, since 0.37.0
These parameters are used as fallback names to search for. This is meant to be used for cases
where the program may have many alternative names, such as `foo` and `foo.py`. The function will
check for the arguments one by one and the first one that is found is returned.
KWARGS
default_options list[str] | dict[str | bool | int | list[str]], since 1.3.0
An array of default option values that override those set in the subproject's `meson.options` (like
`default_options` in project, they only have effect when Meson is run for the first time, and
command line arguments override any default options in build files)
dirs list[str], since 0.53.0
extra list of absolute paths where to look for program names.
disabler bool, default: false, since 0.49.0
If `true` and the program couldn't be found, return a disabler object instead of a not-found
object.
native bool, default: false, since 0.43.0
Defines how this executable should be searched. By default it is set to `false`, which causes Meson
to first look for the executable in the cross file (when cross building) and if it is not defined
there, then from the system. If set to `true`, the cross file is ignored and the program is only
searched from the system.
required bool | feature, default: true
When `true`, Meson will abort if no program can be found. If `required` is set to `false`, Meson
continue even if none of the programs can be found. You can then use the `.found()` method on the
returned external_program to check whether it was found or not. (since 0.47.0) The value of a
`feature`[0] option can also be passed to the `required` keyword argument.
version list[str], since 0.52.0
Specifies the required version, see dependency for argument format. By default, the version of the
program is determined by running `program_name --version` command. If stdout is empty it fallbacks
to stderr. If the output contains more text than simply a version number, only the first occurrence
of numbers separated by dots is kept. If the output is more complicated than that, the version
checking will have to be done manually using run_command.
version_argument str, since 1.5.0
Specifies the argument to pass when trying to find the version of the program. If this is
unspecified, `program_name --version` will be used.
generator()
SYNOPSIS
generator generator(
exe,
arguments:,
capture: false,
depends:,
depfile:,
output:,
)
DESCRIPTION
See also: custom_target
This function creates a generator object that can be used to run custom compilation commands. The
only positional argument is the executable to use. It can either be a self-built executable or one
returned by find_program.
The template strings passed to all the keyword arguments accept the following special substitutions:
- `@PLAINNAME@`: the complete input file name, e.g: `foo.c` becomes `foo.c` (unchanged)
- `@BASENAME@`: the base of the input filename, e.g.: `foo.c.y` becomes `foo.c` (extension is
removed)
Each string passed to the `output` keyword argument must be constructed using one or both of these
two substitutions.
In addition to the above substitutions, the `arguments` keyword argument also accepts the following:
- `@OUTPUT@`: the full path to the output file
- `@INPUT@`: the full path to the input file
- `@DEPFILE@`: the full path to the depfile
- `@SOURCE_DIR@`: the full path to the root of the source tree
- `@CURRENT_SOURCE_DIR@`: this is the directory where the currently processed meson.build is located
in
- `@BUILD_DIR@`: the full path to the root of the build dir where the output will be placed
NOTE: Generators should only be used for outputs that will only be used as inputs for a build_target
or a custom_target. When you use the processed output of a generator in multiple targets, the
generator will be run multiple times to create outputs for each target. Each output will be created
in a target-private directory `@BUILD_DIR@`.
If you want to generate files for general purposes such as for generating headers to be used by
several sources, or data that will be installed, and so on, use a custom_target instead.
POSARGS
exe exe | external_program, required
Executable for the command to run
KWARGS
arguments list[str]
A list of template strings that will be the command line arguments passed to the executable.
capture bool, default: false, since 0.43.0
When this argument is set to true, Meson captures `stdout` of the `executable` and writes it to the
target file specified as `output`.
depends list[build_tgt | custom_tgt | custom_idx], since 0.51.0
An array of build targets that must be built before this generator can be run. This is used if you
have a generator that calls a second executable that is built in this project (custom_idx was not
available between 0.60 and 1.4.0).
depfile str
A template string pointing to a dependency file that a generator can write listing all the
additional files this target depends on, for example a C compiler would list all the header files
it included, and a change in any one of these files triggers a recompilation,
output list[str]
Template string (or list of template strings) defining how an output file name is (or multiple
output names are) generated from a single source file name.
get_option()
SYNOPSIS
str | int | bool | feature | list[str | int | bool] get_option(
option_name,
)
DESCRIPTION
Obtains the value of the project build option[19] specified in the positional argument.
Note that the value returned for built-in options that end in `dir` such as `bindir` and `libdir` is
usually a path relative to (and inside) the `prefix` but you should not rely on that, as it can also
be an absolute path in some cases[20]. `install_dir` arguments[21] handle that as expected but if
you need an absolute path, e.g. to use in a define etc., you should use the path concatenation
operator like this: `get_option('prefix') / get_option('localstatedir')`. Never manually join paths
as if they were strings.
For options of type `feature` a feature option object is returned instead of a string. See `feature`
options[0] documentation for more details.
POSARGS
option_name str, required
Name of the option to query
get_variable()
SYNOPSIS
any get_variable(variable_name, [default])
DESCRIPTION
This function can be used to dynamically obtain a variable. `res = get_variable(varname, fallback)`
takes the value of `varname` (which must be a string) and stores the variable of that name into
`res`. If the variable does not exist, the variable `fallback` is stored to `res`instead. If a
fallback is not specified, then attempting to read a non-existing variable will cause a fatal error.
POSARGS
variable_name str, required
Name of the variable to get
OPTARGS
default any
Fallback value to return when the variable does not exist
import()
SYNOPSIS
module import(module_name, disabler:, required: true)
DESCRIPTION
Imports the given extension module. Returns an object that can be used to call the methods of the
module. Here's an example for a hypothetical `testmod` module.
POSARGS
module_name str, required
Name of the module to import.
KWARGS
disabler bool, since 0.59.0
Returns a disabler object when not found.
required bool | feature, default: true, since 0.59.0
When set to `false`, Meson will proceed with the build even if the module is not found. When set
to a `feature`[0] option, the feature will control if it is searched and whether to fail if not
found.
EXAMPLE
tmod = import('testmod')
tmod.do_something()
include_directories()
SYNOPSIS
inc include_directories(includes..., is_system: false)
DESCRIPTION
Returns an opaque object which contains the directories (relative to the current directory) given in
the positional arguments. The result can then be passed to the `include_directories:` keyword
argument when building executables or libraries. You can use the returned object in any subdirectory
you want, Meson will make the paths work automatically.
Note that this function call itself does not add the directories into the search path, since there is
no global search path. For something like that, see `add_project_arguments()`.
See also `implicit_include_directories` parameter of executable, which adds current source and build
directories to include path.
Each directory given is converted to two include paths: one that is relative to the source root and
one relative to the build root.
VARARGS
includes str, 0...N times
Include paths to add.
KWARGS
is_system bool, default: false
If set to `true`, flags the specified directories as system directories. This means that they will
be used with the `-isystem` compiler argument rather than `-I` on compilers that support this flag
(in practice everything except Visual Studio).
EXAMPLE
For example, with the following source tree layout in `/home/user/project.git`:
`meson.build`:
project(...)
subdir('include')
subdir('src')
`include/meson.build`:
inc = include_directories('.')
`src/meson.build`:
sources = [...]
executable('some-tool', sources,
include_directories : inc,
...)
If the build tree is `/tmp/build-tree`, the following include paths will be added to the
`executable()` call: `-I/tmp/build-tree/include -I/home/user/project.git/include`.
install_data()
SYNOPSIS
void install_data(
file...,
follow_symlinks: true,
install_dir:,
install_mode:,
install_tag:,
preserve_path: false,
rename:,
sources:,
)
DESCRIPTION
Installs files from the source tree that are listed as positional arguments.
See Installing[20] for more examples.
VARARGS
file file | str, 0...N times
Files to install.
KWARGS
follow_symlinks bool, default: true, since 1.3.0
If true, dereferences links and copies their target instead. The default value will become false
in the future.
install_dir str
The absolute or relative path to the installation directory. If this is a relative path, it is
assumed to be relative to the prefix.
If omitted, the directory defaults to `{datadir}/{projectname}` (since 0.45.0).
install_mode list[str | int | bool], since 0.38.0
specify the file mode in symbolic format and optionally the owner/uid and group/gid for the
installed files. For example:
`install_mode: 'rw-r--r--'` for just the file mode
`install_mode: ['rw-r--r--', 'nobody', 'nogroup']` for the file mode and the user/group
`install_mode: ['rw-r-----', 0, 0]` for the file mode and uid/gid
To leave any of these three as the default, specify `false`.
install_tag str, since 0.60.0
A string used by the `meson install --tags` command to install only a subset of the files. By
default these files have no install tag which means they are not being installed when `--tags`
argument is specified.
preserve_path bool, default: false, since 0.64.0
Disable stripping child-directories from data files when installing.
This is equivalent to GNU Automake's `nobase` option.
rename list[str], since 0.46.0
If specified renames each source file into corresponding file from `rename` list. Nested paths are
allowed and they are joined with `install_dir`. Length of `rename` list must be equal to the number
of sources.
sources list[file | str]
Additional files to install.
WARNINGS
the `install_mode` kwarg ignored integer values between 0.59.0 -- 1.1.0. an omitted `install_dir`
kwarg did not work correctly inside of a subproject until 1.3.0. an omitted `install_dir` kwarg did
not work correctly when combined with the `preserve_path` kwarg untill 1.3.0.
install_emptydir()
SYNOPSIS
void install_emptydir(dirpath..., install_mode:, install_tag:)
since 0.60.0
DESCRIPTION
Installs a new directory entry to the location specified by the positional argument. If the directory
exists and is not empty, the contents are left in place.
VARARGS
dirpath str, 0...N times
Directory to create during installation.
KWARGS
install_mode list[str | int | bool]
Specify the file mode in symbolic format and optionally the owner/uid and group/gid for the created
directory.
See the `install_mode` kwarg of install_data for more information.
install_tag str
A string used by the `meson install --tags` command to install only a subset of the files. By
default this directory has no install tag which means it is not installed when the `--tags`
argument is specified.
WARNINGS
the `install_mode` kwarg ignored integer values before 1.1.0.
install_headers()
SYNOPSIS
void install_headers(
file...,
follow_symlinks: true,
install_dir:,
install_mode:,
preserve_path: false,
subdir:,
)
DESCRIPTION
Installs the specified header files from the source tree into the system header directory (usually
`/{prefix}/include`) during the install step. This directory can be overridden by specifying it with
the `install_dir` keyword argument. If you just want to install into a subdirectory of the system
header directory, then use the `subdir` argument. As an example if this has the value `myproj` then
the headers would be installed to `/{prefix}/include/myproj`.
VARARGS
file file | str, 0...N times
Header files to install.
KWARGS
follow_symlinks bool, default: true, since 1.3.0
If true, dereferences links and copies their target instead. The default value will become false
in the future.
install_dir str
Where to install to.
install_mode list[str | int | bool], since 0.47.0
Specify the file mode in symbolic format and optionally the owner/uid and group/gid for the
installed files.
See the `install_mode` kwarg of install_data for more information.
preserve_path bool, default: false, since 0.63.0
Disable stripping child-directories from header files when installing.
This is equivalent to GNU Automake's `nobase` option.
subdir str
Install to the `subdir` subdirectory of the default includedir.
Incompatible with the `install_dir` kwarg.
WARNINGS
the `install_mode` kwarg ignored integer values between 0.59.0 -- 1.1.0.
EXAMPLE
For example, this will install `common.h` and `kola.h` into `/{prefix}/include`:
install_headers('common.h', 'proj/kola.h')
This will install `common.h` and `kola.h` into `/{prefix}/include/myproj`:
install_headers('common.h', 'proj/kola.h', subdir : 'myproj')
This will install `common.h` and `kola.h` into `/{prefix}/cust/myproj`:
install_headers('common.h', 'proj/kola.h', install_dir : 'cust', subdir : 'myproj')
This will install `common.h` into `/{prefix}/include` and `kola.h` into `/{prefix}/include/proj/`:
install_headers('common.h, 'proj/kola.h', preserve_path : true)
install_man()
SYNOPSIS
void install_man(file..., install_dir:, install_mode:, locale:)
DESCRIPTION
Installs the specified man files from the source tree into system's man directory during the install
step. This directory can be overridden by specifying it with the `install_dir` keyword argument.
(since 0.49.0) [manpages are no longer compressed implicitly][install_man_49].
[install_man_49]: https://mesonbuild.com/Release-notes-for-0-49-0.html#manpages-are-no-longer-
compressed-implicitly
VARARGS
file file | str, 0...N times
Man pages to install.
KWARGS
install_dir str
Where to install to.
install_mode list[str | int | bool], since 0.47.0
Specify the file mode in symbolic format and optionally the owner/uid and group/gid for the
installed files.
See the `install_mode` kwarg of install_data for more information.
locale str, since 0.58.0
Can be used to specify the locale into which the man page will be installed within the manual page
directory tree. An example manual might be `foo.fr.1` with a locale of `fr`, such that
`{mandir}/{locale}/man{num}/foo.1` becomes the installed file.
WARNINGS
the `install_mode` kwarg ignored integer values between 0.59.0 -- 1.1.0.
install_subdir()
SYNOPSIS
void install_subdir(
subdir_name,
exclude_directories:,
exclude_files:,
follow_symlinks: true,
install_dir:,
install_mode:,
install_tag:,
strip_directory: false,
)
DESCRIPTION
Installs the entire given subdirectory and its contents from the source tree to the location
specified by the keyword argument `install_dir`.
(since 0.45.0, deprecated since 0.60.0) If the subdirectory does not exist in the source tree, an
empty directory is created in the specified location. A newly created subdirectory may only be
created in the keyword argument `install_dir`. There are a number of flaws with this method, and it
was never intentionally designed to work this way, please use install_emptydir instead.
POSARGS
subdir_name str, required
The sub-directory to install
KWARGS
exclude_directories list[str], since 0.47.0
A list of directory names that should not be installed. Names are interpreted as paths relative to
the `subdir_name` location.
exclude_files list[str]
A list of file names that should not be installed. Names are interpreted as paths relative to the
`subdir_name` location.
follow_symlinks bool, default: true, since 1.3.0
If true, dereferences links and copies their target instead. The default value will become false
in the future.
install_dir str
Where to install to.
install_mode list[str | int | bool], since 0.47.0
Specify the file mode in symbolic format and optionally the owner/uid and group/gid for the
installed files.
See the `install_mode` kwarg of install_data for more information.
install_tag str, since 0.60.0
A string used by the `meson install --tags` command to install only a subset of the files. By
default these files have no install tag which means they are not being installed when `--tags`
argument is specified.
strip_directory bool, default: false, since 0.45.0
Install directory contents. If `strip_directory=true` only the last component of the source path
is used.
WARNINGS
the `install_mode` kwarg ignored integer values between 0.59.0 -- 1.1.0.
EXAMPLE
For a given directory `foo`:
text
foo/
bar/
file1
file2
`install_subdir('foo', install_dir : 'share', strip_directory : false)` creates
text
share/
foo/
bar/
file1
file2
`install_subdir('foo', install_dir : 'share', strip_directory : true)` creates
text
share/
bar/
file1
file2
`install_subdir('foo/bar', install_dir : 'share', strip_directory : false)` creates
text
share/
bar/
file1
`install_subdir('foo/bar', install_dir : 'share', strip_directory : true)` creates
text
share/
file1
`install_subdir('new_directory', install_dir : 'share')` creates
text
share/
new_directory/
install_symlink()
SYNOPSIS
void install_symlink(
link_name,
install_dir:,
install_tag:,
pointing_to:,
)
since 0.61.0
DESCRIPTION
Installs a symbolic link to `pointing_to` target under install_dir.
POSARGS
link_name str, required
Name of the created link under `install_dir`. It cannot contain path separators. Those should go
in `install_dir`.
KWARGS
install_dir str, required
The absolute or relative path to the installation directory for the links. If this is a relative
path, it is assumed to be relative to the prefix.
install_tag str
A string used by the `meson install --tags` command to install only a subset of the files. By
default these files have no install tag which means they are not being installed when `--tags`
argument is specified.
pointing_to str, required
Target to point the link to. Can be absolute or relative and that will be respected when creating
the link.
is_disabler()
SYNOPSIS
bool is_disabler(var)
since 0.52.0
DESCRIPTION
Returns true if a variable is a disabler and false otherwise.
POSARGS
var any, required
The variable to test
is_variable()
SYNOPSIS
bool is_variable(var)
since 0.52.0
DESCRIPTION
Returns true if a variable of the given name exists and false otherwise.
POSARGS
var str, required
The variable to test
jar()
SYNOPSIS
jar jar(
target_name,
source...,
<lang>_args:,
<lang>_pch:,
build_by_default: true,
build_rpath:,
d_debug:,
d_import_dirs:,
d_module_versions:,
d_unittest: false,
dependencies:,
extra_files:,
gnu_symbol_visibility:,
gui_app: false,
implicit_include_directories: true,
include_directories:,
install: false,
install_dir:,
install_mode:,
install_rpath:,
install_tag:,
java_resources:,
link_args:,
link_depends:,
link_language:,
link_whole:,
link_with:,
main_class:,
name_prefix:,
name_suffix:,
native: false,
objects:,
override_options:,
rust_crate_type:,
rust_dependency_map:,
sources:,
vala_args:,
win_subsystem: 'console',
)
DESCRIPTION
Build a jar from the specified Java source files. Keyword arguments are the same as executable's,
with the addition of `main_class` which specifies the main class to execute when running the jar with
`java -jar file.jar`.
POSARGS
target_name str, required
The unique name of the build target
VARARGS
source str | file | custom_tgt | custom_idx | generated_list, 0...N times
Input source to compile. The following types are supported:
- Strings relative to the current source directory
- file objects defined in any preceding build file
- The return value of configure-time generators such as configure_file
- The return value of build-time generators such as custom_target or generator.process
These input files can be sources, objects, libraries, or any other file. Meson will automatically
categorize them based on the extension and use them accordingly. For instance, sources (`.c`,
`.cpp`, `.vala`, `.rs`, etc) will be compiled and objects (`.o`, `.obj`) and libraries (`.so`,
`.dll`, etc) will be linked.
With the Ninja backend, Meson will create a build-time order-only dependency[3] on all generated
input files, including unknown files. This is needed to bootstrap the generation of the real
dependencies in the depfile[4] generated by your compiler to determine when to rebuild sources.
Ninja relies on this dependency file for all input files, generated and non-generated. The
behavior is similar for other backends.
KWARGS
<lang>_args list[str]
compiler flags to use for the given language; eg: `cpp_args` for C++
<lang>_pch str
precompiled header file to use for the given language
build_by_default bool, default: true, since 0.38.0
Causes, when set to `true`, to have this target be built by default. This means it will be built
when `meson compile` is called without any arguments. The default value is `true` for all built
target types.
build_rpath str, since 0.42.0
A string to add to target's rpath definition in the build dir, but which will be removed on install
d_debug list[str]
The D version identifiers[5] to add during the compilation of D source files.
d_import_dirs list[str]
List of directories to look in for string imports used in the D programming language.
d_module_versions list[str | int]
List of module version identifiers set when compiling D sources.
d_unittest bool, default: false
When set to true, the D modules are compiled in debug mode.
dependencies list[dep]
one or more dependency objects created with dependency or compiler.find_library (for external deps)
or declare_dependency (for deps built by the project)
extra_files str | file | custom_tgt | custom_idx
Not used for the build itself but are shown as source files in IDEs that group files by targets
(such as Visual Studio)
gnu_symbol_visibility str, since 0.48.0
Specifies how symbols should be exported, see e.g the GCC Wiki[6] for more information. This value
can either be an empty string or one of `default`, `internal`, `hidden`, `protected` or
`inlineshidden`, which is the same as `hidden` but also includes things like C++ implicit
constructors as specified in the GCC manual. Ignored on compilers that do not support GNU
visibility arguments.
gui_app bool, default: false, deprecated since 0.56.0
When set to true flags this target as a GUI application on platforms where this makes a difference,
deprecated since 0.56.0, use `win_subsystem` instead.
implicit_include_directories bool, default: true, since 0.42.0
Controls whether Meson adds the current source and build directories to the include path
include_directories list[inc | str]
one or more objects created with the include_directories function, or (since 0.50.0) strings, which
will be transparently expanded to include directory objects
install bool, default: false
When set to true, this executable should be installed.
install_dir str
override install directory for this file. If the value is a relative path, it will be considered
relative the `prefix` option. For example, if you want to install plugins into a subdir, you'd use
something like this: `install_dir : get_option('libdir') / 'projectname-1.0'`.
install_mode list[str | int], since 0.47.0
Specify the file mode in symbolic format and optionally the owner/uid and group/gid for the
installed files.
See the `install_mode` kwarg of install_data for more information.
install_rpath str
A string to set the target's rpath to after install (but not before that). On Windows, this
argument has no effect.
install_tag str, since 0.60.0
A string used by the `meson install --tags` command to install only a subset of the files. By
default all build targets have the tag `runtime` except for static libraries that have the `devel`
tag.
java_resources structured_src, since 0.62.0
Resources to be added to the jar
link_args list[str]
Flags to use during linking. You can use UNIX-style flags here for all platforms.
link_depends str | file | custom_tgt | custom_idx
Strings, files, or custom targets the link step depends on such as a symbol visibility map. The
purpose is to automatically trigger a re-link (but not a re-compile) of the target when this file
changes.
link_language str, since 0.51.0
Makes the linker for this target be for the specified language. It is generally unnecessary to set
this, as Meson will detect the right linker to use in most cases. There are only two cases where
this is needed. One, your main function in an executable is not in the language Meson picked, or
second you want to force a library to use only one ABI.
(broken until 0.55.0)
link_whole list[lib | custom_tgt | custom_idx], since 0.40.0
Links all contents of the given static libraries whether they are used or not, equivalent to the
`-Wl,--whole-archive` argument flag of GCC, or the ´/WHOLEARCHIVE' MSVC linker option. This allows
the linked target to re-export symbols from all objects in the static libraries.
(since 0.41.0) If passed a list that list will be flattened.
(since 0.51.0) This argument also accepts outputs produced by custom targets. The user must ensure
that the output is a library in the correct format.
link_with list[lib | custom_tgt | custom_idx]
One or more shared or static libraries (built by this project) that this target should be linked
with. (since 0.41.0) If passed a list this list will be flattened. (since 0.51.0) The arguments can
also be custom targets. In this case Meson will assume that merely adding the output file in the
linker command line is sufficient to make linking work. If this is not sufficient, then the build
system writer must write all other steps manually.
main_class str
Main class for running the built jar
name_prefix str | list[void]
The string that will be used as the prefix for the target output filename by overriding the default
(only used for libraries). By default this is `lib` on all platforms and compilers, except for MSVC
shared libraries where it is omitted to follow convention, and Cygwin shared libraries where it is
`cyg`.
Set this to `[]`, or omit the keyword argument for the default behaviour.
name_suffix str | list[void]
The string that will be used as the extension for the target by overriding the default. By default
on Windows this is `exe` for executables and on other platforms it is omitted.
For shared libraries, the default value is `dylib` on macOS, `dll` on Windows, and `so` everywhere
else. For static libraries, it is `a` everywhere. By convention MSVC static libraries use the
`lib` suffix, but we use `a` to avoid a potential name clash with shared libraries which also
generate import libraries with a `lib` suffix.
Set this to `[]`, or omit the keyword argument for the default behaviour.
native bool, default: false
Controls whether the target is compiled for the build or host machines.
objects list[extracted_obj | file | str]
List of object files that should be linked in this target.
Since 1.1.0 this can include generated files in addition to object files that you don't have source
to or that object files produced by other build targets. In earlier release, generated object
files had to be placed in `sources`.
override_options list[str] | dict[str | bool | int | list[str]], since 0.40.0
takes an array of strings in the same format as `project`'s `default_options` overriding the values
of these options for this target only. (since 1.2.0): A dictionary may now be passed.
rust_crate_type str, deprecated since 1.3.0, since 0.42.0
Set the specific type of rust crate to compile (when compiling rust).
If the target is an executable this defaults to "bin", the only allowed value.
If it is a static_library it defaults to "lib", and may be "lib", "staticlib", or "rlib". If "lib"
then Rustc will pick a default, "staticlib" means a C ABI library, "rlib" means a Rust ABI.
If it is a shared_library it defaults to "lib", and may be "lib", "dylib", "cdylib", or "proc-
macro". If "lib" then Rustc will pick a default, "cdylib" means a C ABI library, "dylib" means a
Rust ABI, and "proc-macro" is a special rust procedural macro crate.
"proc-macro" is new in 0.62.0.
Since 1.3.0 this is deprecated and replaced by "rust_abi" keyword argument. `proc_macro` crates
are now handled by the `rust.proc_macro()`[7] method.
rust_dependency_map dict[str], since 1.2.0
On rust targets this provides a map of library names to the crate name with which it would be
available inside the rust code.
This allows renaming similar to the dependency renaming feature of cargo or `extern crate foo as
bar` inside rust code.
sources str | file | custom_tgt | custom_idx | generated_list | structured_src
Additional source files. Same as the source varargs.
vala_args list[str | file]
Compiler flags for Vala. Unlike other languages this may contain Files
win_subsystem str, default: 'console', since 0.56.0
Specifies the subsystem type to use on the Windows platform. Typical values include `console` for
text mode programs and `windows` for gui apps. The value can also contain version specification
such as `windows,6.0`. See MSDN documentation[8] for the full list.
join_paths()
SYNOPSIS
str join_paths(part...)
since 0.36.0
DESCRIPTION
Joins the given strings into a file system path segment. For example `join_paths('foo', 'bar')`
results in `foo/bar`. If any one of the individual segments is an absolute path, all segments before
it are dropped. That means that `join_paths('foo', '/bar')` returns `/bar`.
(since 0.49.0) Using the `/` operator on strings is equivalent to calling join_paths.
# res1 and res2 will have identical values
res1 = join_paths(foo, bar)
res2 = foo / bar
VARARGS
part str, 1...N times
The path parts to join.
WARNINGS
Don't use join_paths for sources in library and executable. You should use files instead.
library()
SYNOPSIS
lib library(
target_name,
source...,
<lang>_args:,
<lang>_pch:,
<lang>_shared_args:,
<lang>_static_args:,
build_by_default: true,
build_rpath:,
d_debug:,
d_import_dirs:,
d_module_versions:,
d_unittest: false,
darwin_versions:,
dependencies:,
extra_files:,
gnu_symbol_visibility:,
gui_app: false,
implicit_include_directories: true,
include_directories:,
install: false,
install_dir:,
install_mode:,
install_rpath:,
install_tag:,
link_args:,
link_depends:,
link_language:,
link_whole:,
link_with:,
name_prefix:,
name_suffix:,
native: false,
objects:,
override_options:,
pic:,
prelink:,
rust_abi:,
rust_crate_type:,
rust_dependency_map:,
sources:,
soversion:,
vala_args:,
vala_shared_args:,
vala_static_args:,
version:,
vs_module_defs:,
win_subsystem: 'console',
)
DESCRIPTION
Builds a library that is either static, shared or both depending on the value of `default_library`
user option[22]. You should use this instead of shared_library, static_library or both_libraries
most of the time. This allows you to toggle your entire project (including subprojects) from shared
to static with only one option. This option applies to libraries being built internal to the entire
project. For external dependencies, the default library type preferred is shared. This can be adapted
on a per library basis using the dependency `static` keyword.
The keyword arguments for this are the same as for build_target
POSARGS
target_name str, required
The unique name of the build target
VARARGS
source str | file | custom_tgt | custom_idx | generated_list, 0...N times
Input source to compile. The following types are supported:
- Strings relative to the current source directory
- file objects defined in any preceding build file
- The return value of configure-time generators such as configure_file
- The return value of build-time generators such as custom_target or generator.process
These input files can be sources, objects, libraries, or any other file. Meson will automatically
categorize them based on the extension and use them accordingly. For instance, sources (`.c`,
`.cpp`, `.vala`, `.rs`, etc) will be compiled and objects (`.o`, `.obj`) and libraries (`.so`,
`.dll`, etc) will be linked.
With the Ninja backend, Meson will create a build-time order-only dependency[3] on all generated
input files, including unknown files. This is needed to bootstrap the generation of the real
dependencies in the depfile[4] generated by your compiler to determine when to rebuild sources.
Ninja relies on this dependency file for all input files, generated and non-generated. The
behavior is similar for other backends.
KWARGS
<lang>_args list[str]
compiler flags to use for the given language; eg: `cpp_args` for C++
<lang>_pch str
precompiled header file to use for the given language
<lang>_shared_args list[str], since 1.3.0
Arguments that are only passed to a shared library
<lang>_static_args list[str], since 1.3.0
Arguments that are only passed to a static library
build_by_default bool, default: true, since 0.38.0
Causes, when set to `true`, to have this target be built by default. This means it will be built
when `meson compile` is called without any arguments. The default value is `true` for all built
target types.
build_rpath str, since 0.42.0
A string to add to target's rpath definition in the build dir, but which will be removed on install
d_debug list[str]
The D version identifiers[5] to add during the compilation of D source files.
d_import_dirs list[str]
List of directories to look in for string imports used in the D programming language.
d_module_versions list[str | int]
List of module version identifiers set when compiling D sources.
d_unittest bool, default: false
When set to true, the D modules are compiled in debug mode.
darwin_versions str | int | list[str], since 0.48.0
Defines the `compatibility version` and `current version` for the dylib on macOS. If a list is
specified, it must be either zero, one, or two elements. If only one element is specified or if
it's not a list, the specified value will be used for setting both compatibility version and
current version. If unspecified, the `soversion` will be used as per the aforementioned rules.
dependencies list[dep]
one or more dependency objects created with dependency or compiler.find_library (for external deps)
or declare_dependency (for deps built by the project)
extra_files str | file | custom_tgt | custom_idx
Not used for the build itself but are shown as source files in IDEs that group files by targets
(such as Visual Studio)
gnu_symbol_visibility str, since 0.48.0
Specifies how symbols should be exported, see e.g the GCC Wiki[6] for more information. This value
can either be an empty string or one of `default`, `internal`, `hidden`, `protected` or
`inlineshidden`, which is the same as `hidden` but also includes things like C++ implicit
constructors as specified in the GCC manual. Ignored on compilers that do not support GNU
visibility arguments.
gui_app bool, default: false, deprecated since 0.56.0
When set to true flags this target as a GUI application on platforms where this makes a difference,
deprecated since 0.56.0, use `win_subsystem` instead.
implicit_include_directories bool, default: true, since 0.42.0
Controls whether Meson adds the current source and build directories to the include path
include_directories list[inc | str]
one or more objects created with the include_directories function, or (since 0.50.0) strings, which
will be transparently expanded to include directory objects
install bool, default: false
When set to true, this executable should be installed.
install_dir str
override install directory for this file. If the value is a relative path, it will be considered
relative the `prefix` option. For example, if you want to install plugins into a subdir, you'd use
something like this: `install_dir : get_option('libdir') / 'projectname-1.0'`.
install_mode list[str | int], since 0.47.0
Specify the file mode in symbolic format and optionally the owner/uid and group/gid for the
installed files.
See the `install_mode` kwarg of install_data for more information.
install_rpath str
A string to set the target's rpath to after install (but not before that). On Windows, this
argument has no effect.
install_tag str, since 0.60.0
A string used by the `meson install --tags` command to install only a subset of the files. By
default all build targets have the tag `runtime` except for static libraries that have the `devel`
tag.
link_args list[str]
Flags to use during linking. You can use UNIX-style flags here for all platforms.
link_depends str | file | custom_tgt | custom_idx
Strings, files, or custom targets the link step depends on such as a symbol visibility map. The
purpose is to automatically trigger a re-link (but not a re-compile) of the target when this file
changes.
link_language str, since 0.51.0
Makes the linker for this target be for the specified language. It is generally unnecessary to set
this, as Meson will detect the right linker to use in most cases. There are only two cases where
this is needed. One, your main function in an executable is not in the language Meson picked, or
second you want to force a library to use only one ABI.
(broken until 0.55.0)
link_whole list[lib | custom_tgt | custom_idx], since 0.40.0
Links all contents of the given static libraries whether they are used or not, equivalent to the
`-Wl,--whole-archive` argument flag of GCC, or the ´/WHOLEARCHIVE' MSVC linker option. This allows
the linked target to re-export symbols from all objects in the static libraries.
(since 0.41.0) If passed a list that list will be flattened.
(since 0.51.0) This argument also accepts outputs produced by custom targets. The user must ensure
that the output is a library in the correct format.
link_with list[lib | custom_tgt | custom_idx]
One or more shared or static libraries (built by this project) that this target should be linked
with. (since 0.41.0) If passed a list this list will be flattened. (since 0.51.0) The arguments can
also be custom targets. In this case Meson will assume that merely adding the output file in the
linker command line is sufficient to make linking work. If this is not sufficient, then the build
system writer must write all other steps manually.
name_prefix str | list[void]
The string that will be used as the prefix for the target output filename by overriding the default
(only used for libraries). By default this is `lib` on all platforms and compilers, except for MSVC
shared libraries where it is omitted to follow convention, and Cygwin shared libraries where it is
`cyg`.
Set this to `[]`, or omit the keyword argument for the default behaviour.
name_suffix str | list[void]
The string that will be used as the extension for the target by overriding the default. By default
on Windows this is `exe` for executables and on other platforms it is omitted.
For shared libraries, the default value is `dylib` on macOS, `dll` on Windows, and `so` everywhere
else. For static libraries, it is `a` everywhere. By convention MSVC static libraries use the
`lib` suffix, but we use `a` to avoid a potential name clash with shared libraries which also
generate import libraries with a `lib` suffix.
Set this to `[]`, or omit the keyword argument for the default behaviour.
native bool, default: false
Controls whether the target is compiled for the build or host machines.
objects list[extracted_obj | file | str]
List of object files that should be linked in this target.
Since 1.1.0 this can include generated files in addition to object files that you don't have source
to or that object files produced by other build targets. In earlier release, generated object
files had to be placed in `sources`.
override_options list[str] | dict[str | bool | int | list[str]], since 0.40.0
takes an array of strings in the same format as `project`'s `default_options` overriding the values
of these options for this target only. (since 1.2.0): A dictionary may now be passed.
pic bool, since 0.36.0
Builds the library as positional independent code (so it can be linked into a shared library). This
option has no effect on Windows and OS X since it doesn't make sense on Windows and PIC cannot be
disabled on OS X.
prelink bool, since 0.57.0
If `true` the object files in the target will be prelinked, meaning that it will contain only one
prelinked object file rather than the individual object files.
rust_abi str, since 1.3.0
Set the specific ABI to compile (when compiling rust). - 'rust' (default): Create a "rlib" or
"dylib" crate depending on the library type being build.
- 'c': Create a "cdylib" or "staticlib" crate depending on the library type being build.
rust_crate_type str, deprecated since 1.3.0, since 0.42.0
Set the specific type of rust crate to compile (when compiling rust).
If the target is an executable this defaults to "bin", the only allowed value.
If it is a static_library it defaults to "lib", and may be "lib", "staticlib", or "rlib". If "lib"
then Rustc will pick a default, "staticlib" means a C ABI library, "rlib" means a Rust ABI.
If it is a shared_library it defaults to "lib", and may be "lib", "dylib", "cdylib", or "proc-
macro". If "lib" then Rustc will pick a default, "cdylib" means a C ABI library, "dylib" means a
Rust ABI, and "proc-macro" is a special rust procedural macro crate.
"proc-macro" is new in 0.62.0.
Since 1.3.0 this is deprecated and replaced by "rust_abi" keyword argument. `proc_macro` crates
are now handled by the `rust.proc_macro()`[7] method.
rust_dependency_map dict[str], since 1.2.0
On rust targets this provides a map of library names to the crate name with which it would be
available inside the rust code.
This allows renaming similar to the dependency renaming feature of cargo or `extern crate foo as
bar` inside rust code.
sources str | file | custom_tgt | custom_idx | generated_list | structured_src
Additional source files. Same as the source varargs.
soversion str | int
A string or integer specifying the soversion of this shared library, such as `0`. On Linux and
Windows this is used to set the soversion (or equivalent) in the filename. For example, if
`soversion` is `4`, a Windows DLL will be called `foo-4.dll` and one of the aliases of the Linux
shared library would be `libfoo.so.4`. If this is not specified, the first part of `version` is
used instead (see below). For example, if `version` is `3.6.0` and `soversion` is not defined, it
is set to `3`.
vala_args list[str | file]
Compiler flags for Vala. Unlike other languages this may contain Files
vala_shared_args list[str | file], since 1.3.0
Arguments that are only passed to a shared library Like `vala_args`, files is allowed in addition
to string
vala_static_args list[str | file], since 1.3.0
Arguments that are only passed to a static library Like `vala_args`, files is allowed in addition
to string
version str
A string specifying the version of this shared library, such as `1.1.0`. On Linux and OS X, this is
used to set the shared library version in the filename, such as `libfoo.so.1.1.0` and
`libfoo.1.1.0.dylib`. If this is not specified, `soversion` is used instead (see above).
vs_module_defs str | file | custom_tgt | custom_idx
Specify a Microsoft module definition file for controlling symbol exports, etc., on platforms where
that is possible (e.g. Windows).
(Since 1.3.0) custom_idx are supported
win_subsystem str, default: 'console', since 0.56.0
Specifies the subsystem type to use on the Windows platform. Typical values include `console` for
text mode programs and `windows` for gui apps. The value can also contain version specification
such as `windows,6.0`. See MSDN documentation[8] for the full list.
WARNINGS
using <lang>_shared_args and/or <lang>_static_args may lead to much higher compilation times with
both_library, as object files cannot be shared between the static and shared targets. It is
guaranteed to not duplicate the build if these arguments are empty arrays
message()
SYNOPSIS
void message(text, more_text...)
DESCRIPTION
This function prints its argument to stdout.
POSARGS
text str | int | bool | list[str | int | bool] | dict[str | int | bool], required
The message to print.
VARARGS
more_text str | int | bool | list[str | int | bool] | dict[str | int | bool], 0...N times, since
0.54.0
Additional text that will be printed separated by spaces.
project()
SYNOPSIS
void project(
project_name,
language...,
default_options:,
license:,
license_files:,
meson_version:,
subproject_dir: 'subprojects',
version:,
)
DESCRIPTION
The first function called in each project, to initialize Meson.
The first argument to this function must be a string defining the name of this project.
The project name can be any string you want, it's not used for anything except descriptive purposes.
However since it is written to e.g. the dependency manifest is usually makes sense to have it be the
same as the project tarball or pkg-config name. So for example you would probably want to use the
name _libfoobar_ instead of _The Foobar Library_.
It may be followed by the list of programming languages that the project uses.
(since 0.40.0) The list of languages is optional.
These languages may be used both for `native: false` (the default) (host machine) targets and for
`native: true` (build machine) targets. (since 0.56.0) The build machine compilers for the specified
languages are not required.
Supported values for languages are `c`, `cpp` (for `C++`), `cuda`, `cython`, `d`, `objc`, `objcpp`,
`fortran`, `java`, `cs` (for `C#`), `vala` and `rust`.
POSARGS
project_name str, required
The name of the project.
VARARGS
language str, 0...N times
The languages that Meson should initialize.
KWARGS
default_options list[str] | dict[str | bool | int | list[str]]
Accepts strings in the form `key=value` which have the same format as options to `meson configure`.
For example to set the default project type you would set this: `default_options :
['buildtype=debugoptimized']`. Note that these settings are only used when running Meson for the
first time. Global options such as `buildtype` can only be specified in the master project,
settings in subprojects are ignored. Project specific options are used normally even in
subprojects.
Note that some options can override the default behavior; for example, using `c_args` here means
that the `CFLAGS` environment variable is not used. Consider using add_project_arguments() instead.
(since 1.2.0): A dictionary may now be passed.
license str | list[str]
Takes a string or array of strings describing the license(s) the code is under.
This should be an SPDX license expression[23], using the standardized license identifier from the
SPDX license list[24]. Usually this would be something like `license : 'GPL-2.0-or-later'`. If
there are multiple licenses you can use the `AND` and `OR` operators to join them: `license :
'Apache-2.0 OR GPL-2.0'`.
For backwards compatibility reasons you can also pass an array of licenses here. This is not
recommended, as it is ambiguous: `license : ['Apache-2.0', 'GPL-2.0-only']` instead use an SPDX
expression: `license : 'Apache-2.0 OR GPL-2.0-only'`, which makes it clear that the license mean
OR, not AND.
Note that the text is informal and is only written to the dependency manifest. Meson does not do
any license validation, you are responsible for verifying that you abide by all licensing terms.
You can access the value in your Meson build files with `meson.project_license()`.
license_files str | list[str], since 1.1.0
Takes a string or array of strings with the paths to the license file(s) the code is under.
This enhances the value of the `license` kwarg by allowing to specify both the short license name
and the full license text. Usually this would be something like `license_files: ['COPYING']`.
Note that the files are informal and are only installed with the dependency manifest. Meson does
not do any license validation, you are responsible for verifying that you abide by all licensing
terms. You can access the value in your Meson build files with meson.project_license_files.
meson_version str
Takes a string describing which Meson version the project requires. Usually something like
`>=0.28.0`.
subproject_dir str, default: 'subprojects'
Specifies the top level directory name that holds Meson subprojects. This is only meant as a
compatibility option for existing code bases that house their embedded source code in a custom
directory. All new projects should not set this but instead use the default value. It should be
noted that this keyword argument is ignored inside subprojects. There can be only one subproject
dir and it is set in the top level Meson file.
version str | file
A free form string describing the version of this project. You can access the value in your Meson
build files with meson.project_version. (Since 0.57.0) this can also be a file object pointing to a
file that contains exactly one line of text.
range()
SYNOPSIS
range range([start], [stop], [step])
since 0.58.0
DESCRIPTION
Return an opaque object that can be only be used in `foreach` statements.
<pre><code class="language-meson">range range(int <b>stop</b>) range range(int <b>start</b>, int
<b>stop</b>[, int <b>step</b>])</code></pre>
- `start` must be integer greater or equal to 0. Defaults to 0.
- `stop` must be integer greater or equal to `start`.
- `step` must be integer greater or equal to 1. Defaults to 1.
It cause the `foreach` loop to be called with the value from `start` included to `stop` excluded with
an increment of `step` after each loop.
OPTARGS
start int, default: 0
The start of the range
stop int
The end of the range
step int, default: 1
The loop increment
EXAMPLE
# Loop 15 times with i from 0 to 14 included.
foreach i : range(15)
...
endforeach
The range object can also be assigned to a variable and indexed.
r = range(5, 10, 2)
assert(r[2] == 9)
run_command()
SYNOPSIS
runresult run_command(
command...,
capture: true,
check: false,
env:,
)
DESCRIPTION
Runs the command specified in positional arguments. `command` can be a string, or the output of
find_program, files or configure_file, or a compiler object.
Returns a runresult object containing the result of the invocation. The command is run from an
unspecified directory, and Meson will set three environment variables `MESON_SOURCE_ROOT`,
`MESON_BUILD_ROOT` and `MESON_SUBDIR` that specify the source directory, build directory and
subdirectory the target was defined in, respectively.
See also External commands[25].
VARARGS
command str | file | external_program | compiler, 0...N times
The command to execute during the setup process.
KWARGS
capture bool, default: true, since 0.47.0
If `true`, any output generated on stdout will be captured and returned by the `.stdout()` method.
If it is false, then `.stdout()` will return an empty string.
check bool, default: false, since 0.47.0
If `true`, the exit status code of the command will be checked, and the configuration will fail if
it is non-zero. Note that the default value will be `true` in future releases.
env env | list[str] | dict[str], since 0.50.0
environment variables to set, such as `['NAME1=value1', 'NAME2=value2']`, or an env object which
allows more sophisticated environment juggling. (Since 0.52.0) A dictionary is also accepted.
run_target()
SYNOPSIS
run_tgt run_target(target_name, command:, depends:, env:)
DESCRIPTION
This function creates a new top-level target that runs a specified command with the specified
arguments. Like all top-level targets, this integrates with the selected backend. For instance, you
can run it as `meson compile target_name`. Note that a run target produces no output as far as Meson
is concerned. It is only meant for tasks such as running a code formatter or flashing an external
device's firmware with a built file.
The command is run from an unspecified directory, and Meson will set three environment variables
`MESON_SOURCE_ROOT`, `MESON_BUILD_ROOT` and `MESON_SUBDIR` that specify the source directory, build
directory and subdirectory the target was defined in, respectively.
Since 0.57.0 The template strings passed to `command` keyword arguments accept the following special
substitutions: - `@SOURCE_ROOT@`: the path to the root of the source tree. Depending on the backend,
this may be an absolute or a relative to current workdir path.
- `@BUILD_ROOT@`: the path to the root of the build tree. Depending on the backend, this may be an
absolute or a relative to current workdir path.
- `@CURRENT_SOURCE_DIR@` Since 0.57.1: this is the directory where the currently processed
meson.build is located in. Depending on the backend, this may be an absolute or a relative to current
workdir path.
POSARGS
target_name str, required
The name of the run target
KWARGS
command list[exe| external_program | custom_tgt | file | str]
A list containing the command to run and the arguments to pass to it. Each list item may be a
string or a target. For instance, passing the return value of executable as the first item will run
that executable, or passing a string as the first item will find that command in `PATH` and run it.
depends list[build_tgt | custom_tgt | custom_idx]
A list of targets that this target depends on but which are not listed in the command array
(because, for example, the script does file globbing internally, custom_idx was not possible as a
type between 0.60 and 1.4.0).
env env | list[str] | dict[str], since 0.57.0
environment variables to set, such as `{'NAME1': 'value1', 'NAME2': 'value2'}` or `['NAME1=value1',
'NAME2=value2']`, or an env object which allows more sophisticated environment juggling.
set_variable()
SYNOPSIS
void set_variable(variable_name, value)
DESCRIPTION
Assigns a value to the given variable name. Calling `set_variable('foo', bar)` is equivalent to `foo
= bar`.
(since 0.46.1) The `value` parameter can be an array type.
POSARGS
variable_name str, required
The name of the variable to set
value any, required
The value to set the variable to
shared_library()
SYNOPSIS
lib shared_library(
target_name,
source...,
<lang>_args:,
<lang>_pch:,
build_by_default: true,
build_rpath:,
d_debug:,
d_import_dirs:,
d_module_versions:,
d_unittest: false,
darwin_versions:,
dependencies:,
extra_files:,
gnu_symbol_visibility:,
gui_app: false,
implicit_include_directories: true,
include_directories:,
install: false,
install_dir:,
install_mode:,
install_rpath:,
install_tag:,
link_args:,
link_depends:,
link_language:,
link_whole:,
link_with:,
name_prefix:,
name_suffix:,
native: false,
objects:,
override_options:,
rust_abi:,
rust_crate_type:,
rust_dependency_map:,
sources:,
soversion:,
vala_args:,
version:,
vs_module_defs:,
win_subsystem: 'console',
)
DESCRIPTION
Builds a shared library with the given sources.
POSARGS
target_name str, required
The unique name of the build target
VARARGS
source str | file | custom_tgt | custom_idx | generated_list, 0...N times
Input source to compile. The following types are supported:
- Strings relative to the current source directory
- file objects defined in any preceding build file
- The return value of configure-time generators such as configure_file
- The return value of build-time generators such as custom_target or generator.process
These input files can be sources, objects, libraries, or any other file. Meson will automatically
categorize them based on the extension and use them accordingly. For instance, sources (`.c`,
`.cpp`, `.vala`, `.rs`, etc) will be compiled and objects (`.o`, `.obj`) and libraries (`.so`,
`.dll`, etc) will be linked.
With the Ninja backend, Meson will create a build-time order-only dependency[3] on all generated
input files, including unknown files. This is needed to bootstrap the generation of the real
dependencies in the depfile[4] generated by your compiler to determine when to rebuild sources.
Ninja relies on this dependency file for all input files, generated and non-generated. The
behavior is similar for other backends.
KWARGS
<lang>_args list[str]
compiler flags to use for the given language; eg: `cpp_args` for C++
<lang>_pch str
precompiled header file to use for the given language
build_by_default bool, default: true, since 0.38.0
Causes, when set to `true`, to have this target be built by default. This means it will be built
when `meson compile` is called without any arguments. The default value is `true` for all built
target types.
build_rpath str, since 0.42.0
A string to add to target's rpath definition in the build dir, but which will be removed on install
d_debug list[str]
The D version identifiers[5] to add during the compilation of D source files.
d_import_dirs list[str]
List of directories to look in for string imports used in the D programming language.
d_module_versions list[str | int]
List of module version identifiers set when compiling D sources.
d_unittest bool, default: false
When set to true, the D modules are compiled in debug mode.
darwin_versions str | int | list[str], since 0.48.0
Defines the `compatibility version` and `current version` for the dylib on macOS. If a list is
specified, it must be either zero, one, or two elements. If only one element is specified or if
it's not a list, the specified value will be used for setting both compatibility version and
current version. If unspecified, the `soversion` will be used as per the aforementioned rules.
dependencies list[dep]
one or more dependency objects created with dependency or compiler.find_library (for external deps)
or declare_dependency (for deps built by the project)
extra_files str | file | custom_tgt | custom_idx
Not used for the build itself but are shown as source files in IDEs that group files by targets
(such as Visual Studio)
gnu_symbol_visibility str, since 0.48.0
Specifies how symbols should be exported, see e.g the GCC Wiki[6] for more information. This value
can either be an empty string or one of `default`, `internal`, `hidden`, `protected` or
`inlineshidden`, which is the same as `hidden` but also includes things like C++ implicit
constructors as specified in the GCC manual. Ignored on compilers that do not support GNU
visibility arguments.
gui_app bool, default: false, deprecated since 0.56.0
When set to true flags this target as a GUI application on platforms where this makes a difference,
deprecated since 0.56.0, use `win_subsystem` instead.
implicit_include_directories bool, default: true, since 0.42.0
Controls whether Meson adds the current source and build directories to the include path
include_directories list[inc | str]
one or more objects created with the include_directories function, or (since 0.50.0) strings, which
will be transparently expanded to include directory objects
install bool, default: false
When set to true, this executable should be installed.
install_dir str
override install directory for this file. If the value is a relative path, it will be considered
relative the `prefix` option. For example, if you want to install plugins into a subdir, you'd use
something like this: `install_dir : get_option('libdir') / 'projectname-1.0'`.
install_mode list[str | int], since 0.47.0
Specify the file mode in symbolic format and optionally the owner/uid and group/gid for the
installed files.
See the `install_mode` kwarg of install_data for more information.
install_rpath str
A string to set the target's rpath to after install (but not before that). On Windows, this
argument has no effect.
install_tag str, since 0.60.0
A string used by the `meson install --tags` command to install only a subset of the files. By
default all build targets have the tag `runtime` except for static libraries that have the `devel`
tag.
link_args list[str]
Flags to use during linking. You can use UNIX-style flags here for all platforms.
link_depends str | file | custom_tgt | custom_idx
Strings, files, or custom targets the link step depends on such as a symbol visibility map. The
purpose is to automatically trigger a re-link (but not a re-compile) of the target when this file
changes.
link_language str, since 0.51.0
Makes the linker for this target be for the specified language. It is generally unnecessary to set
this, as Meson will detect the right linker to use in most cases. There are only two cases where
this is needed. One, your main function in an executable is not in the language Meson picked, or
second you want to force a library to use only one ABI.
(broken until 0.55.0)
link_whole list[lib | custom_tgt | custom_idx], since 0.40.0
Links all contents of the given static libraries whether they are used or not, equivalent to the
`-Wl,--whole-archive` argument flag of GCC, or the ´/WHOLEARCHIVE' MSVC linker option. This allows
the linked target to re-export symbols from all objects in the static libraries.
(since 0.41.0) If passed a list that list will be flattened.
(since 0.51.0) This argument also accepts outputs produced by custom targets. The user must ensure
that the output is a library in the correct format.
link_with list[lib | custom_tgt | custom_idx]
One or more shared or static libraries (built by this project) that this target should be linked
with. (since 0.41.0) If passed a list this list will be flattened. (since 0.51.0) The arguments can
also be custom targets. In this case Meson will assume that merely adding the output file in the
linker command line is sufficient to make linking work. If this is not sufficient, then the build
system writer must write all other steps manually.
name_prefix str | list[void]
The string that will be used as the prefix for the target output filename by overriding the default
(only used for libraries). By default this is `lib` on all platforms and compilers, except for MSVC
shared libraries where it is omitted to follow convention, and Cygwin shared libraries where it is
`cyg`.
Set this to `[]`, or omit the keyword argument for the default behaviour.
name_suffix str | list[void]
The string that will be used as the extension for the target by overriding the default. By default
on Windows this is `exe` for executables and on other platforms it is omitted.
For shared libraries, the default value is `dylib` on macOS, `dll` on Windows, and `so` everywhere
else. For static libraries, it is `a` everywhere. By convention MSVC static libraries use the
`lib` suffix, but we use `a` to avoid a potential name clash with shared libraries which also
generate import libraries with a `lib` suffix.
Set this to `[]`, or omit the keyword argument for the default behaviour.
native bool, default: false
Controls whether the target is compiled for the build or host machines.
objects list[extracted_obj | file | str]
List of object files that should be linked in this target.
Since 1.1.0 this can include generated files in addition to object files that you don't have source
to or that object files produced by other build targets. In earlier release, generated object
files had to be placed in `sources`.
override_options list[str] | dict[str | bool | int | list[str]], since 0.40.0
takes an array of strings in the same format as `project`'s `default_options` overriding the values
of these options for this target only. (since 1.2.0): A dictionary may now be passed.
rust_abi str, since 1.3.0
Set the specific ABI to compile (when compiling rust). - 'rust' (default): Create a "dylib" crate.
- 'c': Create a "cdylib" crate.
rust_crate_type str, deprecated since 1.3.0, since 0.42.0
Set the specific type of rust crate to compile (when compiling rust).
If the target is an executable this defaults to "bin", the only allowed value.
If it is a static_library it defaults to "lib", and may be "lib", "staticlib", or "rlib". If "lib"
then Rustc will pick a default, "staticlib" means a C ABI library, "rlib" means a Rust ABI.
If it is a shared_library it defaults to "lib", and may be "lib", "dylib", "cdylib", or "proc-
macro". If "lib" then Rustc will pick a default, "cdylib" means a C ABI library, "dylib" means a
Rust ABI, and "proc-macro" is a special rust procedural macro crate.
"proc-macro" is new in 0.62.0.
Since 1.3.0 this is deprecated and replaced by "rust_abi" keyword argument. `proc_macro` crates
are now handled by the `rust.proc_macro()`[7] method.
rust_dependency_map dict[str], since 1.2.0
On rust targets this provides a map of library names to the crate name with which it would be
available inside the rust code.
This allows renaming similar to the dependency renaming feature of cargo or `extern crate foo as
bar` inside rust code.
sources str | file | custom_tgt | custom_idx | generated_list | structured_src
Additional source files. Same as the source varargs.
soversion str | int
A string or integer specifying the soversion of this shared library, such as `0`. On Linux and
Windows this is used to set the soversion (or equivalent) in the filename. For example, if
`soversion` is `4`, a Windows DLL will be called `foo-4.dll` and one of the aliases of the Linux
shared library would be `libfoo.so.4`. If this is not specified, the first part of `version` is
used instead (see below). For example, if `version` is `3.6.0` and `soversion` is not defined, it
is set to `3`.
vala_args list[str | file]
Compiler flags for Vala. Unlike other languages this may contain Files
version str
A string specifying the version of this shared library, such as `1.1.0`. On Linux and OS X, this is
used to set the shared library version in the filename, such as `libfoo.so.1.1.0` and
`libfoo.1.1.0.dylib`. If this is not specified, `soversion` is used instead (see above).
vs_module_defs str | file | custom_tgt | custom_idx
Specify a Microsoft module definition file for controlling symbol exports, etc., on platforms where
that is possible (e.g. Windows).
(Since 1.3.0) custom_idx are supported
win_subsystem str, default: 'console', since 0.56.0
Specifies the subsystem type to use on the Windows platform. Typical values include `console` for
text mode programs and `windows` for gui apps. The value can also contain version specification
such as `windows,6.0`. See MSDN documentation[8] for the full list.
shared_module()
SYNOPSIS
build_tgt shared_module(
target_name,
source...,
<lang>_args:,
<lang>_pch:,
build_by_default: true,
build_rpath:,
d_debug:,
d_import_dirs:,
d_module_versions:,
d_unittest: false,
dependencies:,
extra_files:,
gnu_symbol_visibility:,
gui_app: false,
implicit_include_directories: true,
include_directories:,
install: false,
install_dir:,
install_mode:,
install_rpath:,
install_tag:,
link_args:,
link_depends:,
link_language:,
link_whole:,
link_with:,
name_prefix:,
name_suffix:,
native: false,
objects:,
override_options:,
rust_abi:,
rust_crate_type:,
rust_dependency_map:,
sources:,
vala_args:,
vs_module_defs:,
win_subsystem: 'console',
)
since 0.37.0
DESCRIPTION
Builds a shared module with the given sources.
This is useful for building modules that will be `dlopen()`ed and hence may contain undefined symbols
that will be provided by the library that is loading it.
If you want the shared module to be able to refer to functions and variables defined in the
executable it is loaded by, you will need to set the `export_dynamic` argument of the executable to
`true`.
POSARGS
target_name str, required
The unique name of the build target
VARARGS
source str | file | custom_tgt | custom_idx | generated_list, 0...N times
Input source to compile. The following types are supported:
- Strings relative to the current source directory
- file objects defined in any preceding build file
- The return value of configure-time generators such as configure_file
- The return value of build-time generators such as custom_target or generator.process
These input files can be sources, objects, libraries, or any other file. Meson will automatically
categorize them based on the extension and use them accordingly. For instance, sources (`.c`,
`.cpp`, `.vala`, `.rs`, etc) will be compiled and objects (`.o`, `.obj`) and libraries (`.so`,
`.dll`, etc) will be linked.
With the Ninja backend, Meson will create a build-time order-only dependency[3] on all generated
input files, including unknown files. This is needed to bootstrap the generation of the real
dependencies in the depfile[4] generated by your compiler to determine when to rebuild sources.
Ninja relies on this dependency file for all input files, generated and non-generated. The
behavior is similar for other backends.
KWARGS
<lang>_args list[str]
compiler flags to use for the given language; eg: `cpp_args` for C++
<lang>_pch str
precompiled header file to use for the given language
build_by_default bool, default: true, since 0.38.0
Causes, when set to `true`, to have this target be built by default. This means it will be built
when `meson compile` is called without any arguments. The default value is `true` for all built
target types.
build_rpath str, since 0.42.0
A string to add to target's rpath definition in the build dir, but which will be removed on install
d_debug list[str]
The D version identifiers[5] to add during the compilation of D source files.
d_import_dirs list[str]
List of directories to look in for string imports used in the D programming language.
d_module_versions list[str | int]
List of module version identifiers set when compiling D sources.
d_unittest bool, default: false
When set to true, the D modules are compiled in debug mode.
dependencies list[dep]
one or more dependency objects created with dependency or compiler.find_library (for external deps)
or declare_dependency (for deps built by the project)
extra_files str | file | custom_tgt | custom_idx
Not used for the build itself but are shown as source files in IDEs that group files by targets
(such as Visual Studio)
gnu_symbol_visibility str, since 0.48.0
Specifies how symbols should be exported, see e.g the GCC Wiki[6] for more information. This value
can either be an empty string or one of `default`, `internal`, `hidden`, `protected` or
`inlineshidden`, which is the same as `hidden` but also includes things like C++ implicit
constructors as specified in the GCC manual. Ignored on compilers that do not support GNU
visibility arguments.
gui_app bool, default: false, deprecated since 0.56.0
When set to true flags this target as a GUI application on platforms where this makes a difference,
deprecated since 0.56.0, use `win_subsystem` instead.
implicit_include_directories bool, default: true, since 0.42.0
Controls whether Meson adds the current source and build directories to the include path
include_directories list[inc | str]
one or more objects created with the include_directories function, or (since 0.50.0) strings, which
will be transparently expanded to include directory objects
install bool, default: false
When set to true, this executable should be installed.
install_dir str
override install directory for this file. If the value is a relative path, it will be considered
relative the `prefix` option. For example, if you want to install plugins into a subdir, you'd use
something like this: `install_dir : get_option('libdir') / 'projectname-1.0'`.
install_mode list[str | int], since 0.47.0
Specify the file mode in symbolic format and optionally the owner/uid and group/gid for the
installed files.
See the `install_mode` kwarg of install_data for more information.
install_rpath str
A string to set the target's rpath to after install (but not before that). On Windows, this
argument has no effect.
install_tag str, since 0.60.0
A string used by the `meson install --tags` command to install only a subset of the files. By
default all build targets have the tag `runtime` except for static libraries that have the `devel`
tag.
link_args list[str]
Flags to use during linking. You can use UNIX-style flags here for all platforms.
link_depends str | file | custom_tgt | custom_idx
Strings, files, or custom targets the link step depends on such as a symbol visibility map. The
purpose is to automatically trigger a re-link (but not a re-compile) of the target when this file
changes.
link_language str, since 0.51.0
Makes the linker for this target be for the specified language. It is generally unnecessary to set
this, as Meson will detect the right linker to use in most cases. There are only two cases where
this is needed. One, your main function in an executable is not in the language Meson picked, or
second you want to force a library to use only one ABI.
(broken until 0.55.0)
link_whole list[lib | custom_tgt | custom_idx], since 0.40.0
Links all contents of the given static libraries whether they are used or not, equivalent to the
`-Wl,--whole-archive` argument flag of GCC, or the ´/WHOLEARCHIVE' MSVC linker option. This allows
the linked target to re-export symbols from all objects in the static libraries.
(since 0.41.0) If passed a list that list will be flattened.
(since 0.51.0) This argument also accepts outputs produced by custom targets. The user must ensure
that the output is a library in the correct format.
link_with list[lib | custom_tgt | custom_idx]
One or more shared or static libraries (built by this project) that this target should be linked
with. (since 0.41.0) If passed a list this list will be flattened. (since 0.51.0) The arguments can
also be custom targets. In this case Meson will assume that merely adding the output file in the
linker command line is sufficient to make linking work. If this is not sufficient, then the build
system writer must write all other steps manually.
name_prefix str | list[void]
The string that will be used as the prefix for the target output filename by overriding the default
(only used for libraries). By default this is `lib` on all platforms and compilers, except for MSVC
shared libraries where it is omitted to follow convention, and Cygwin shared libraries where it is
`cyg`.
Set this to `[]`, or omit the keyword argument for the default behaviour.
name_suffix str | list[void]
The string that will be used as the extension for the target by overriding the default. By default
on Windows this is `exe` for executables and on other platforms it is omitted.
For shared libraries, the default value is `dylib` on macOS, `dll` on Windows, and `so` everywhere
else. For static libraries, it is `a` everywhere. By convention MSVC static libraries use the
`lib` suffix, but we use `a` to avoid a potential name clash with shared libraries which also
generate import libraries with a `lib` suffix.
Set this to `[]`, or omit the keyword argument for the default behaviour.
native bool, default: false
Controls whether the target is compiled for the build or host machines.
objects list[extracted_obj | file | str]
List of object files that should be linked in this target.
Since 1.1.0 this can include generated files in addition to object files that you don't have source
to or that object files produced by other build targets. In earlier release, generated object
files had to be placed in `sources`.
override_options list[str] | dict[str | bool | int | list[str]], since 0.40.0
takes an array of strings in the same format as `project`'s `default_options` overriding the values
of these options for this target only. (since 1.2.0): A dictionary may now be passed.
rust_abi str, since 1.3.0
Set the specific ABI to compile (when compiling rust). - 'rust' (default): Create a "dylib" crate.
- 'c': Create a "cdylib" crate.
rust_crate_type str, deprecated since 1.3.0, since 0.42.0
Set the specific type of rust crate to compile (when compiling rust).
If the target is an executable this defaults to "bin", the only allowed value.
If it is a static_library it defaults to "lib", and may be "lib", "staticlib", or "rlib". If "lib"
then Rustc will pick a default, "staticlib" means a C ABI library, "rlib" means a Rust ABI.
If it is a shared_library it defaults to "lib", and may be "lib", "dylib", "cdylib", or "proc-
macro". If "lib" then Rustc will pick a default, "cdylib" means a C ABI library, "dylib" means a
Rust ABI, and "proc-macro" is a special rust procedural macro crate.
"proc-macro" is new in 0.62.0.
Since 1.3.0 this is deprecated and replaced by "rust_abi" keyword argument. `proc_macro` crates
are now handled by the `rust.proc_macro()`[7] method.
rust_dependency_map dict[str], since 1.2.0
On rust targets this provides a map of library names to the crate name with which it would be
available inside the rust code.
This allows renaming similar to the dependency renaming feature of cargo or `extern crate foo as
bar` inside rust code.
sources str | file | custom_tgt | custom_idx | generated_list | structured_src
Additional source files. Same as the source varargs.
vala_args list[str | file]
Compiler flags for Vala. Unlike other languages this may contain Files
vs_module_defs str | file | custom_tgt | custom_idx, since 0.52.0
Specify a Microsoft module definition file for controlling symbol exports, etc., on platforms where
that is possible (e.g. Windows).
(Since 1.3.0) custom_idx are supported
win_subsystem str, default: 'console', since 0.56.0
Specifies the subsystem type to use on the Windows platform. Typical values include `console` for
text mode programs and `windows` for gui apps. The value can also contain version specification
such as `windows,6.0`. See MSDN documentation[8] for the full list.
NOTES
*Linking to a shared module on platforms other than Android is deprecated, and will be an error in
the future*. It was previously allowed because it was the only way to have a shared-library-like
target that contained references to undefined symbols. However, since 0.40.0, the `override_options:`
build_target keyword argument can be used to create such a shared_library by passing
`override_options: 'b_lundef=false'`. Shared modules have other characteristics that make them
incompatible with linking, such as a lack of SONAME. On macOS and iOS, linking to shared modules is
disallowed by the linker, so we disallow it at configure time. On Android, if a shared module `foo`
uses symbols from another shared module `bar`, `foo` must also be linked to `bar`. Hence, linking one
shared module to another will always be allowed when building for Android.
static_library()
SYNOPSIS
lib static_library(
target_name,
source...,
<lang>_args:,
<lang>_pch:,
build_by_default: true,
build_rpath:,
d_debug:,
d_import_dirs:,
d_module_versions:,
d_unittest: false,
dependencies:,
extra_files:,
gnu_symbol_visibility:,
gui_app: false,
implicit_include_directories: true,
include_directories:,
install: false,
install_dir:,
install_mode:,
install_rpath:,
install_tag:,
link_args:,
link_depends:,
link_language:,
link_whole:,
link_with:,
name_prefix:,
name_suffix:,
native: false,
objects:,
override_options:,
pic:,
prelink:,
rust_abi:,
rust_crate_type:,
rust_dependency_map:,
sources:,
vala_args:,
win_subsystem: 'console',
)
DESCRIPTION
Builds a static library with the given sources.
POSARGS
target_name str, required
The unique name of the build target
VARARGS
source str | file | custom_tgt | custom_idx | generated_list, 0...N times
Input source to compile. The following types are supported:
- Strings relative to the current source directory
- file objects defined in any preceding build file
- The return value of configure-time generators such as configure_file
- The return value of build-time generators such as custom_target or generator.process
These input files can be sources, objects, libraries, or any other file. Meson will automatically
categorize them based on the extension and use them accordingly. For instance, sources (`.c`,
`.cpp`, `.vala`, `.rs`, etc) will be compiled and objects (`.o`, `.obj`) and libraries (`.so`,
`.dll`, etc) will be linked.
With the Ninja backend, Meson will create a build-time order-only dependency[3] on all generated
input files, including unknown files. This is needed to bootstrap the generation of the real
dependencies in the depfile[4] generated by your compiler to determine when to rebuild sources.
Ninja relies on this dependency file for all input files, generated and non-generated. The
behavior is similar for other backends.
KWARGS
<lang>_args list[str]
compiler flags to use for the given language; eg: `cpp_args` for C++
<lang>_pch str
precompiled header file to use for the given language
build_by_default bool, default: true, since 0.38.0
Causes, when set to `true`, to have this target be built by default. This means it will be built
when `meson compile` is called without any arguments. The default value is `true` for all built
target types.
build_rpath str, since 0.42.0
A string to add to target's rpath definition in the build dir, but which will be removed on install
d_debug list[str]
The D version identifiers[5] to add during the compilation of D source files.
d_import_dirs list[str]
List of directories to look in for string imports used in the D programming language.
d_module_versions list[str | int]
List of module version identifiers set when compiling D sources.
d_unittest bool, default: false
When set to true, the D modules are compiled in debug mode.
dependencies list[dep]
one or more dependency objects created with dependency or compiler.find_library (for external deps)
or declare_dependency (for deps built by the project)
extra_files str | file | custom_tgt | custom_idx
Not used for the build itself but are shown as source files in IDEs that group files by targets
(such as Visual Studio)
gnu_symbol_visibility str, since 0.48.0
Specifies how symbols should be exported, see e.g the GCC Wiki[6] for more information. This value
can either be an empty string or one of `default`, `internal`, `hidden`, `protected` or
`inlineshidden`, which is the same as `hidden` but also includes things like C++ implicit
constructors as specified in the GCC manual. Ignored on compilers that do not support GNU
visibility arguments.
gui_app bool, default: false, deprecated since 0.56.0
When set to true flags this target as a GUI application on platforms where this makes a difference,
deprecated since 0.56.0, use `win_subsystem` instead.
implicit_include_directories bool, default: true, since 0.42.0
Controls whether Meson adds the current source and build directories to the include path
include_directories list[inc | str]
one or more objects created with the include_directories function, or (since 0.50.0) strings, which
will be transparently expanded to include directory objects
install bool, default: false
When set to true, this executable should be installed.
install_dir str
override install directory for this file. If the value is a relative path, it will be considered
relative the `prefix` option. For example, if you want to install plugins into a subdir, you'd use
something like this: `install_dir : get_option('libdir') / 'projectname-1.0'`.
install_mode list[str | int], since 0.47.0
Specify the file mode in symbolic format and optionally the owner/uid and group/gid for the
installed files.
See the `install_mode` kwarg of install_data for more information.
install_rpath str
A string to set the target's rpath to after install (but not before that). On Windows, this
argument has no effect.
install_tag str, since 0.60.0
A string used by the `meson install --tags` command to install only a subset of the files. By
default all build targets have the tag `runtime` except for static libraries that have the `devel`
tag.
link_args list[str]
Flags to use during linking. You can use UNIX-style flags here for all platforms.
link_depends str | file | custom_tgt | custom_idx
Strings, files, or custom targets the link step depends on such as a symbol visibility map. The
purpose is to automatically trigger a re-link (but not a re-compile) of the target when this file
changes.
link_language str, since 0.51.0
Makes the linker for this target be for the specified language. It is generally unnecessary to set
this, as Meson will detect the right linker to use in most cases. There are only two cases where
this is needed. One, your main function in an executable is not in the language Meson picked, or
second you want to force a library to use only one ABI.
(broken until 0.55.0)
link_whole list[lib | custom_tgt | custom_idx], since 0.40.0
Links all contents of the given static libraries whether they are used or not, equivalent to the
`-Wl,--whole-archive` argument flag of GCC, or the ´/WHOLEARCHIVE' MSVC linker option. This allows
the linked target to re-export symbols from all objects in the static libraries.
(since 0.41.0) If passed a list that list will be flattened.
(since 0.51.0) This argument also accepts outputs produced by custom targets. The user must ensure
that the output is a library in the correct format.
link_with list[lib | custom_tgt | custom_idx]
One or more shared or static libraries (built by this project) that this target should be linked
with. (since 0.41.0) If passed a list this list will be flattened. (since 0.51.0) The arguments can
also be custom targets. In this case Meson will assume that merely adding the output file in the
linker command line is sufficient to make linking work. If this is not sufficient, then the build
system writer must write all other steps manually.
name_prefix str | list[void]
The string that will be used as the prefix for the target output filename by overriding the default
(only used for libraries). By default this is `lib` on all platforms and compilers, except for MSVC
shared libraries where it is omitted to follow convention, and Cygwin shared libraries where it is
`cyg`.
Set this to `[]`, or omit the keyword argument for the default behaviour.
name_suffix str | list[void]
The string that will be used as the extension for the target by overriding the default. By default
on Windows this is `exe` for executables and on other platforms it is omitted.
For shared libraries, the default value is `dylib` on macOS, `dll` on Windows, and `so` everywhere
else. For static libraries, it is `a` everywhere. By convention MSVC static libraries use the
`lib` suffix, but we use `a` to avoid a potential name clash with shared libraries which also
generate import libraries with a `lib` suffix.
Set this to `[]`, or omit the keyword argument for the default behaviour.
native bool, default: false
Controls whether the target is compiled for the build or host machines.
objects list[extracted_obj | file | str]
List of object files that should be linked in this target.
Since 1.1.0 this can include generated files in addition to object files that you don't have source
to or that object files produced by other build targets. In earlier release, generated object
files had to be placed in `sources`.
override_options list[str] | dict[str | bool | int | list[str]], since 0.40.0
takes an array of strings in the same format as `project`'s `default_options` overriding the values
of these options for this target only. (since 1.2.0): A dictionary may now be passed.
pic bool, since 0.36.0
Builds the library as positional independent code (so it can be linked into a shared library). This
option has no effect on Windows and OS X since it doesn't make sense on Windows and PIC cannot be
disabled on OS X.
prelink bool, since 0.57.0
If `true` the object files in the target will be prelinked, meaning that it will contain only one
prelinked object file rather than the individual object files.
rust_abi str, since 1.3.0
Set the specific ABI to compile (when compiling rust). - 'rust' (default): Create a "rlib" crate.
- 'c': Create a "staticlib" crate.
rust_crate_type str, deprecated since 1.3.0, since 0.42.0
Set the specific type of rust crate to compile (when compiling rust).
If the target is an executable this defaults to "bin", the only allowed value.
If it is a static_library it defaults to "lib", and may be "lib", "staticlib", or "rlib". If "lib"
then Rustc will pick a default, "staticlib" means a C ABI library, "rlib" means a Rust ABI.
If it is a shared_library it defaults to "lib", and may be "lib", "dylib", "cdylib", or "proc-
macro". If "lib" then Rustc will pick a default, "cdylib" means a C ABI library, "dylib" means a
Rust ABI, and "proc-macro" is a special rust procedural macro crate.
"proc-macro" is new in 0.62.0.
Since 1.3.0 this is deprecated and replaced by "rust_abi" keyword argument. `proc_macro` crates
are now handled by the `rust.proc_macro()`[7] method.
rust_dependency_map dict[str], since 1.2.0
On rust targets this provides a map of library names to the crate name with which it would be
available inside the rust code.
This allows renaming similar to the dependency renaming feature of cargo or `extern crate foo as
bar` inside rust code.
sources str | file | custom_tgt | custom_idx | generated_list | structured_src
Additional source files. Same as the source varargs.
vala_args list[str | file]
Compiler flags for Vala. Unlike other languages this may contain Files
win_subsystem str, default: 'console', since 0.56.0
Specifies the subsystem type to use on the Windows platform. Typical values include `console` for
text mode programs and `windows` for gui apps. The value can also contain version specification
such as `windows,6.0`. See MSDN documentation[8] for the full list.
structured_sources()
SYNOPSIS
structured_src structured_sources(root, [additional])
since 0.62.0
DESCRIPTION
Create a StructuredSource object, which is opaque and may be passed as a source to any build_target
(including static_library, shared_library, executable, etc.). This is useful for languages like Rust,
which use the filesystem layout to determine import names. This is only allowed in Rust targets, and
cannot be mixed with non structured inputs.
POSARGS
root list[str | file | custom_tgt | custom_idx | generated_list], required
Sources to put at the root of the generated structure
OPTARGS
additional dict[str | file | custom_tgt | custom_idx | generated_list]
Additional sources, where the key is the directory under the root to place the values
subdir()
SYNOPSIS
void subdir(dir_name, if_found:)
DESCRIPTION
Enters the specified subdirectory and executes the `meson.build` file in it. Once that is done, it
returns and execution continues on the line following this `subdir()` command. Variables defined in
that `meson.build` file are then available for use in later parts of the current build file and in
all subsequent build files executed with `subdir()`.
Note that this means that each `meson.build` file in a source tree can and must only be executed
once.
POSARGS
dir_name str, required
Directory relative to the current `meson.build` to enter.
Cannot contain `..`
KWARGS
if_found list[dep], since 0.44.0
Only enter the subdir if all dep.found methods return `true`.
subdir_done()
SYNOPSIS
void subdir_done()
since 0.46.0
DESCRIPTION
Stops further interpretation of the Meson script file from the point of the invocation. All steps
executed up to this point are valid and will be executed by Meson. This means that all targets
defined before the call of subdir_done will be build.
If the current script was called by `subdir` the execution returns to the calling directory and
continues as if the script had reached the end. If the current script is the top level script Meson
configures the project as defined up to this point.
EXAMPLE
project('example exit', 'cpp')
executable('exe1', 'exe1.cpp')
subdir_done()
executable('exe2', 'exe2.cpp')
The executable `exe1` will be build, while the executable `exe2` is not build.
subproject()
SYNOPSIS
subproject subproject(
subproject_name,
default_options:,
required: true,
version:,
)
DESCRIPTION
Takes the project specified in the positional argument and brings that in the current build
specification by returning a subproject object. Subprojects must always be placed inside the
`subprojects` directory at the top source directory. So for example a subproject called `foo` must be
located in `${MESON_SOURCE_ROOT}/subprojects/foo`.
- `default_options` (since 0.37.0): an array of default option values that override those set in the
subproject's `meson.options` (like `default_options` in `project`, they only have effect when Meson
is run for the first time, and command line arguments override any default options in build files).
(since 0.54.0): `default_library` built-in option can also be overridden. (since 1.2.0): A dictionary
may be passed instead of array.
- `version`: works just like the same as in `dependency`. It specifies what version the subproject
should be, as an example `>=1.0.1`
- `required` (since 0.48.0): By default, `required` is `true` and Meson will abort if the subproject
could not be setup. You can set this to `false` and then use the `.found()` method on the subproject
object. You may also pass the value of a `feature`[0] option, same as dependency.
Note that you can use the returned subproject object to access any variable in the subproject.
However, if you want to use a dependency object from inside a subproject, an easier way is to use the
`fallback:` keyword argument to dependency.
See additional documentation[26].
POSARGS
subproject_name str, required
Name of the subproject. The subproject must exist in the `subprojects` directory (or the directory
specified in the `subproject_dir` of project) as a directory or wrap file.
KWARGS
default_options list[str] | dict[str | bool | int | list[str]], since 0.37.0
An array of default option values that override those set in the subproject's `meson.options` (like
`default_options` in project, they only have effect when Meson is run for the first time, and
command line arguments override any default options in build files). (since 0.54.0):
`default_library` built-in option can also be overridden. (since 1.2.0): A dictionary may now be
passed.
required bool | feature, default: true, since 0.48.0
Works just the same as in dependency.
version str | list[str]
Works just like the same as in dependency. It specifies what version the subproject should be, as
an example `>=1.0.1`.
summary()
SYNOPSIS
void summary(
key_or_dict,
[value],
bool_yn: false,
list_sep:,
section:,
)
since 0.53.0
DESCRIPTION
This function is used to summarize build configuration at the end of the build process. This function
provides a way for projects (and subprojects) to report this information in a clear way.
The content is a series of key/value pairs grouped into sections. If the section keyword argument is
omitted, those key/value pairs are implicitly grouped into a section with no title. key/value pairs
can optionally be grouped into a dictionary, but keep in mind that dictionaries do not guarantee
ordering. `key` must be string, `value` can be:
- an integer, boolean or string
- since 0.57.0 an external program or a dependency
- since 0.58.0 a feature option
- a list of those.
Instead of calling summary as `summary(key, value)`, it is also possible to directly pass a
dictionary to the summary function, as seen in the example below.
`summary()` can be called multiple times as long as the same section/key pair doesn't appear twice.
All sections will be collected and printed at the end of the configuration in the same order as they
have been called.
POSARGS
key_or_dict str | dict[str | bool | int | dep | external_program | list[str | bool | int | dep |
external_program]], required
The name of the new entry, or a dict containing multiple entries. If a dict is passed it is
equivalent to calling summary() once for each key-value pair. Keep in mind that dictionaries do
not guarantee ordering.
OPTARGS
value str | bool | int | dep | external_program | list[str | bool | int | dep | external_program]
The value to print for the `key`. Only valid if `key_or_dict` is a str.
KWARGS
bool_yn bool, default: false
Convert bool values to yes and no
list_sep str, since 0.54.0
The separator to use when printing list values in this summary. If no separator is given, each
list item will be printed on its own line.
section str
The section to put this summary information under. If the section keyword argument is omitted,
key/value pairs are implicitly grouped into a section with no title.
EXAMPLE
Example `meson.build`:
project('My Project', version : '1.0')
summary({'bindir': get_option('bindir'),
'libdir': get_option('libdir'),
'datadir': get_option('datadir'),
}, section: 'Directories')
summary({'Some boolean': false,
'Another boolean': true,
'Some string': 'Hello World',
'A list': ['string', 1, true],
}, section: 'Configuration')
Output:
My Project 1.0
Directories
prefix : /opt/gnome
bindir : bin
libdir : lib/x86_64-linux-gnu
datadir : share
Configuration
Some boolean : False
Another boolean: True
Some string : Hello World
A list : string
1
True
test()
SYNOPSIS
void test(
name,
executable,
args:,
depends:,
env:,
is_parallel: true,
priority: 0,
protocol: 'exitcode',
should_fail: false,
suite:,
timeout: 30,
verbose: false,
workdir:,
)
DESCRIPTION
Defines a test to run with the test harness. Takes two positional arguments, the first is the name of
the test and the second is the executable to run. The executable can be an exe object returned by
executable or an external_program object] returned by find_program.
(since 0.55.0) When cross compiling, if an exe_wrapper is needed and defined the environment variable
`MESON_EXE_WRAPPER` will be set to the string value of that wrapper (implementation detail: using
`mesonlib.join_args`). Test scripts may use this to run cross built binaries. If your test needs
`MESON_EXE_WRAPPER` in cross build situations it is your responsibility to return code 77 to tell the
harness to report "skip".
By default, environment variable `MALLOC_PERTURB_`[27] is automatically set by `meson test` to a
random value between 1..255. This can help find memory leaks on configurations using glibc,
including with non-GCC compilers. However, this can have a performance impact, and may fail a test
due to external libraries whose internals are out of the user's control. To check if this feature is
causing an expected runtime crash, disable the feature by temporarily setting environment variable
`MALLOC_PERTURB_=0`. While it's preferable to only temporarily disable this check, if a project
requires permanent disabling of this check in meson.build do like:
nomalloc = environment({'MALLOC_PERTURB_': '0'})
test(..., env: nomalloc, ...)
By default, the environment variables `ASAN_OPTIONS`, `UBSAN_OPTIONS`, and `MSAN_OPTIONS` are set to
enable aborting on detected violations and to give a backtrace. To suppress this, `ASAN_OPTIONS`,
`UBSAN_OPTIONS`, or `MSAN_OPTIONS` can be set in the environment.
In addition to running individual executables as test cases, `test()` can also be used to invoke an
external test harness. In this case, it is best to use `verbose: true` (since 0.62.0) and, if
supported by the external harness, `protocol: 'tap'` (since 0.50.0). This will ensure that Meson
logs each subtest as it runs, instead of including the whole log at the end of the run.
Defined tests can be run in a backend-agnostic way by calling `meson test` inside the build dir, or
by using backend-specific commands, such as `ninja test` or `msbuild RUN_TESTS.vcxproj`.
POSARGS
name str, required
The unique test id
executable exe | jar | external_program | file | custom_tgt | custom_idx, required
The program to execute. (Since 1.4.0) A CustomTarget is also accepted.
KWARGS
args list[str | file | build_tgt | custom_tgt | custom_idx]
Arguments to pass to the executable
depends list[build_tgt | custom_tgt], since 0.46.0
specifies that this test depends on the specified target(s), even though it does not take any of
them as a command line argument. This is meant for cases where test finds those targets internally,
e.g. plugins or globbing. Those targets are built before test is executed even if they have
`build_by_default : false`.
env env | list[str] | dict[str]
environment variables to set, such as `['NAME1=value1', ´NAME2=value2']`, or an env object which
allows more sophisticated environment juggling. (Since 0.52.0) A dictionary is also accepted.
is_parallel bool, default: true
when false, specifies that no other test must be running at the same time as this test
priority int, default: 0, since 0.52.0
specifies the priority of a test. Tests with a higher priority are started before tests with a
lower priority. The starting order of tests with identical priorities is implementation-defined.
The default priority is 0, negative numbers are permitted.
protocol str, default: 'exitcode', since 0.50.0
specifies how the test results are parsed and can be one of `exitcode`, `tap`, or `gtest`. For more
information about test harness protocol read Unit Tests[1]. The following values are accepted:
- `exitcode`: the executable's exit code is used by the test harness to record the outcome of the
test).
- `tap`: Test Anything Protocol[2].
- `gtest` (since 0.55.0): for Google Tests.
- `rust` (since 0.56.0): for native rust tests
should_fail bool, default: false
when true the test is considered passed if the executable returns a non-zero return value (i.e.
reports an error)
suite str | list[str]
`'label'` (or list of labels `['label1', 'label2']`) attached to this test. The suite name is
qualified by a (sub)project name resulting in `(sub)project_name:label`. In the case of a list of
strings, the suite names will be `(sub)project_name:label1`, `(sub)project_name:label2`, etc.
timeout int, default: 30
the amount of seconds the test is allowed to run, a test that exceeds its time limit is always
considered failed, defaults to 30 seconds. Since 0.57 if timeout is `<= 0` the test has infinite
duration, in previous versions of Meson the test would fail with a timeout immediately.
verbose bool, default: false, since 0.62.0
if true, forces the test results to be logged as if `--verbose` was passed to `meson test`.
workdir str
absolute path that will be used as the working directory for the test
unset_variable()
SYNOPSIS
void unset_variable(varname)
since 0.60.0
DESCRIPTION
Unsets a variable. Referencing a variable which has been unset is an error until it has been set
again.
POSARGS
varname str, required
The variable to unset.
vcs_tag()
SYNOPSIS
custom_tgt vcs_tag(
command:,
fallback: [[meson.project_version]],
input:,
output:,
replace_string: '@VCS_TAG@',
)
DESCRIPTION
This command detects revision control commit information at build time and places it in the specified
output file. This file is guaranteed to be up to date on every build. Keywords are similar to
custom_target.
Meson will read the contents of `input`, substitute the `replace_string` with the detected revision
number, and write the result to `output`. This method returns a custom_tgt object that (as usual)
should be used to signal dependencies if other targets use the file outputted by this.
For example, if you generate a header with this and want to use that in a build target, you must add
the return value to the sources of that build target. Without that, Meson will not know the order in
which to build the targets.
If you desire more specific behavior than what this command provides, you should use custom_target.
KWARGS
command list[exe | external_program | custom_tgt | file | str]
The command to execute, see custom_target for details on how this command must be specified.
This parameter is optional. If it is absent, Meson will try its best to find a suitable default
command.
(since 0.62.0) file is accepted.
(since 0.63.0) custom_tgt, exe, and external_program are accepted.
fallback str, default: [[meson.project_version]]
Version number to use when no revision control information is present, such as when building from a
release tarball.
input list[build_tgt | custom_idx | custom_tgt | external_program | extracted_obj | file |
generated_list | str], required
File to modify (e.g. `version.c.in`).
output str, required
File to write the results to (e.g. `version.c`).
replace_string str, default: '@VCS_TAG@'
String in the input file to substitute with the commit information.
warning()
SYNOPSIS
void warning(text, more_text...)
since 0.44.0
DESCRIPTION
This function prints its argument to stdout prefixed with WARNING:.
POSARGS
text str | int | bool | list[str | int | bool] | dict[str | int | bool], required
The message to print.
VARARGS
more_text str | int | bool | list[str | int | bool] | dict[str | int | bool], 0...N times, since
0.54.0
Additional text that will be printed separated by spaces.
bool.to_int()
SYNOPSIS
int bool.to_int()
DESCRIPTION
Returns `1` if `true` and `0` if `false`
bool.to_string()
SYNOPSIS
str bool.to_string([true_str], [false_str])
DESCRIPTION
Returns the string `'true'` if the boolean is true or `'false'` otherwise. You can also pass it two
strings as positional arguments to specify what to return for true/false. For instance,
`bool.to_string('yes', 'no')` will return `yes` if the boolean is true and `no` if it is false.
OPTARGS
true_str str, default: 'true'
The string to return when the boolean is `true`
false_str str, default: 'false'
The string to return when the boolean is `false`
both_libs.get_shared_lib()
SYNOPSIS
lib both_libs.get_shared_lib()
DESCRIPTION
Returns the stored shared library
both_libs.get_static_lib()
SYNOPSIS
lib both_libs.get_static_lib()
DESCRIPTION
Returns the stored static library
build_machine.cpu()
SYNOPSIS
str build_machine.cpu()
DESCRIPTION
Returns a more specific CPU name, such as `i686`, `amd64`, etc.
build_machine.cpu_family()
SYNOPSIS
str build_machine.cpu_family()
DESCRIPTION
Returns the CPU family name. This table[28] contains all known CPU families. These are guaranteed to
continue working.
build_machine.endian()
SYNOPSIS
str build_machine.endian()
DESCRIPTION
returns `'big'` on big-endian systems and `'little'` on little-endian systems.
build_machine.system()
SYNOPSIS
str build_machine.system()
DESCRIPTION
Returns the operating system name. This table[29] Lists all of the currently known Operating System
names, these are guaranteed to continue working.
build_tgt.extract_all_objects()
SYNOPSIS
extracted_obj build_tgt.extract_all_objects(
recursive: true,
)
DESCRIPTION
Acts the same as `extract_objects`, but returns all object files generated by this target.
By default only objects built for this target are returned to maintain backward compatibility with
previous versions. The default value for the `recursive` kwarg will eventually be changed to `true`
in a future version.
KWARGS
recursive bool, default: true, since 0.46.0
Also return objects passed to the `objects` argument of this target.
build_tgt.extract_objects()
SYNOPSIS
extracted_obj build_tgt.extract_objects(source...)
DESCRIPTION
Returns an opaque value representing the object files generated for those source files. This is
typically used to take single object files and link them to unit tests or to compile some source
files with custom flags. To use the object file(s) in another build target, use the `objects:`
keyword argument to a build_target or declare_dependency, or include them in the command line of a
custom_target.
VARARGS
source str | file | custom_tgt | custom_idx | generated_list, 1...N times
Source filenames for which the built objects should be extracted.
build_tgt.found()
SYNOPSIS
bool build_tgt.found()
since 0.59.0
DESCRIPTION
Always returns `true`. This function is meant to make executables objects feature compatible with
external_program objects. This simplifies use-cases where an executable is used instead of an
external_program.
build_tgt.full_path()
SYNOPSIS
str build_tgt.full_path()
DESCRIPTION
Returns a full path pointing to the result target file. NOTE: In most cases using the object itself
will do the same job as this and will also allow Meson to setup inter-target dependencies correctly.
Please file a bug if that doesn't work for you.
build_tgt.get_id()
SYNOPSIS
str build_tgt.get_id()
since 0.26.0
DESCRIPTION
Returns a unique id for the target
build_tgt.name()
SYNOPSIS
str build_tgt.name()
since 0.54.0
DESCRIPTION
Returns the name of the target.
build_tgt.outdir()
SYNOPSIS
str build_tgt.outdir()
since 0.26.0
DESCRIPTION
Returns the output directory relative to the build root of the target
build_tgt.path()
SYNOPSIS
str build_tgt.path()
deprecated since 0.59.0, since 0.59.0
DESCRIPTION
Does the exact same as build_tgt.full_path. NOTE: This function is solely kept for compatibility with
external_program objects. It will be removed once the, also deprecated, corresponding `path()`
function in the external_program object is removed.
build_tgt.private_dir_include()
SYNOPSIS
inc build_tgt.private_dir_include()
DESCRIPTION
Returns a value that works like include_directories, but points to the private directory of this
target. Usually only needed if an another target needs to access some generated internal headers of
this target.
cfg_data.get()
SYNOPSIS
str | int | bool cfg_data.get(varname, [default_value])
since 0.38.0
DESCRIPTION
Returns the value of `varname`, if the value has not been set returns `default_value` if it is
defined (since 0.38.0) and errors out if not
POSARGS
varname str, required
The name of the variable to query
OPTARGS
default_value str | int | bool
The default value to return when `varname` does not exist
cfg_data.get_unquoted()
SYNOPSIS
str | int | bool cfg_data.get_unquoted(varname, [default_value])
since 0.44.0
DESCRIPTION
Returns the value of `varname` but without surrounding double quotes (`"`). If the value has not been
set returns `default_value` if it is defined and errors out if not.
POSARGS
varname str, required
The name of the variable to query
OPTARGS
default_value str | int | bool
The default value to return when `varname` does not exist
cfg_data.has()
SYNOPSIS
bool cfg_data.has(varname)
DESCRIPTION
returns `true` if the specified variable is set
POSARGS
varname str, required
The name of the variable to query
cfg_data.keys()
SYNOPSIS
list[str] cfg_data.keys()
since 0.57.0
DESCRIPTION
Returns an array of keys of the configuration data object.
You can iterate over this array with the `foreach` statement[30].
cfg_data.merge_from()
SYNOPSIS
void cfg_data.merge_from(other)
since 0.42.0
DESCRIPTION
Takes as argument a different configuration data object and copies all entries from that object to
the current.
POSARGS
other cfg_data, required
The other cfg_data object to merge into this one.
cfg_data.set()
SYNOPSIS
void cfg_data.set(varname, value, description:)
DESCRIPTION
Sets a variable to a given value
POSARGS
varname str, required
The name of the variable to set
value str | int | bool, required
The value to set
KWARGS
description str
Message / Comment that will be written in the result file. The replacement assumes a file with C
syntax. If your generated file is source code in some other language, you probably don't want to
add a description field because it most likely will cause a syntax error.
cfg_data.set10()
SYNOPSIS
void cfg_data.set10(varname, value, description:)
DESCRIPTION
Is the same as cfg_data.set but the value is either `true` or `false` and will be written as 1 or 0,
respectively
POSARGS
varname str, required
The name of the variable to set
value bool | int, required
The value to set as either `1` or `0`
Passing numbers was never intended to work, and since 0.62 it has been deprecated. It will be
removed in a future version of Meson. If you need to pass numbers use the `.set` method.
KWARGS
description str
Message / Comment that will be written in the result file. The replacement assumes a file with C
syntax. If your generated file is source code in some other language, you probably don't want to
add a description field because it most likely will cause a syntax error.
WARNINGS
numeric values < 0 have the surprising behavior of being converted to `true`, values > 1 have the
more expected but unintentional behavior of being interpreted as `true`.
cfg_data.set_quoted()
SYNOPSIS
void cfg_data.set_quoted(varname, value, description:)
DESCRIPTION
Is same as cfg_data.set but quotes the value in double quotes (`"`)
POSARGS
varname str, required
The name of the variable to set
value str | int | bool, required
The value to set
KWARGS
description str
Message / Comment that will be written in the result file. The replacement assumes a file with C
syntax. If your generated file is source code in some other language, you probably don't want to
add a description field because it most likely will cause a syntax error.
cmake.subproject_options()
SYNOPSIS
cmake_options cmake.subproject_options()
DESCRIPTION
Returns an empty `cmake_options` object.
cmake_options.add_cmake_defines()
SYNOPSIS
void cmake_options.add_cmake_defines(defines...)
DESCRIPTION
Add CMake defines (`-D<VAR>=<VAL>`) to the CMake commandline
VARARGS
defines dict[str], 0...N times
A `key` `value` map of CMake defines to add (`-D<key>=<val>`)
compiler.alignment()
SYNOPSIS
int compiler.alignment(typename, args:, dependencies:, prefix:)
DESCRIPTION
Returns the alignment of the specified type. For C-like languages, For C-like languages, the header
`stddef.h` and `stdio.h` are included implicitly for native compilation, only `stddef.h` is included
when cross-compiling.
POSARGS
typename str, required
The name of the type to check.
KWARGS
args list[str]
Used to pass a list of compiler arguments. Defining include paths for headers not in the default
include path via `-Isome/path/to/header` is generally supported, however, usually not recommended.
This is because include directories can also be specified via the `include_directories` or the
`dependency` kwarg (if present). The same is also true for passing libraries to link with `-lfoo`.
dependencies dep | list[dep]
Additionally dependencies required for compiling and / or linking.
prefix str | list[str]
Used to add `#include`s and other things that are required for the symbol to be declared. Since
1.0.0 an array is accepted too. When an array is passed, the items are concatenated together
separated by a newline. System definitions should be passed via compiler args (eg: `_GNU_SOURCE`
is often required for some symbols to be exposed on Linux, and it should be passed via `args`
keyword argument).
compiler.check_header()
SYNOPSIS
bool compiler.check_header(
header_name,
args:,
dependencies:,
include_directories:,
no_builtin_args: false,
prefix:,
required: false,
)
since 0.47.0
DESCRIPTION
Returns true if the specified header is usable with the specified prefix, dependencies, and
arguments.
POSARGS
header_name str, required
The header to check.
KWARGS
args list[str]
Used to pass a list of compiler arguments. Defining include paths for headers not in the default
include path via `-Isome/path/to/header` is generally supported, however, usually not recommended.
This is because include directories can also be specified via the `include_directories` or the
`dependency` kwarg (if present). The same is also true for passing libraries to link with `-lfoo`.
dependencies dep | list[dep]
Additionally dependencies required for compiling and / or linking.
include_directories inc | list[inc], since 0.38.0
Extra directories for header searches.
no_builtin_args bool, default: false
When set to `true`, the compiler arguments controlled by built-in configuration options are not
added.
prefix str | list[str]
Used to add `#include`s and other things that are required for the symbol to be declared. Since
1.0.0 an array is accepted too. When an array is passed, the items are concatenated together
separated by a newline. System definitions should be passed via compiler args (eg: `_GNU_SOURCE`
is often required for some symbols to be exposed on Linux, and it should be passed via `args`
keyword argument).
required bool | feature, default: false, since 0.50.0
When set to `true`, Meson will halt if the header check fails. When set to a `feature`[0] option,
the feature will control if it is searched and whether to fail if not found.
compiler.cmd_array()
SYNOPSIS
list[str] compiler.cmd_array()
DESCRIPTION
Returns an array containing the command(s) for the compiler.
compiler.compiles()
SYNOPSIS
bool compiler.compiles(
code,
args:,
dependencies:,
include_directories:,
name:,
no_builtin_args: false,
required: false,
werror: false,
)
DESCRIPTION
Returns true if the code compiles.
POSARGS
code str | file, required
The source code to check.
If a string is passed, the code is used directly. If a file object is passed, its content is used
for the compiler check.
KWARGS
args list[str]
Used to pass a list of compiler arguments. Defining include paths for headers not in the default
include path via `-Isome/path/to/header` is generally supported, however, usually not recommended.
This is because include directories can also be specified via the `include_directories` or the
`dependency` kwarg (if present). The same is also true for passing libraries to link with `-lfoo`.
dependencies dep | list[dep]
Additionally dependencies required for compiling and / or linking.
include_directories inc | list[inc], since 0.38.0
Extra directories for header searches.
name str
The name to use for printing a message about the compiler check. If this keyword argument is not
passed, no message will be printed about the check.
no_builtin_args bool, default: false
When set to `true`, the compiler arguments controlled by built-in configuration options are not
added.
required bool | feature, default: false, since 1.5.0
When set to `true`, Meson will halt if the check fails. When set to a `feature`[0] option, the
feature will control if it is searched and whether to fail if not found.
werror bool, default: false, since 1.3.0
When set to `true`, compiler warnings are treated as error.
compiler.compute_int()
SYNOPSIS
int compiler.compute_int(
expr,
args:,
dependencies:,
guess:,
high: 1024,
include_directories:,
low: -1024,
no_builtin_args: false,
prefix:,
)
since 0.40.0
DESCRIPTION
Computes the value of the given expression (as an example `1 + 2`). When cross compiling this is
evaluated with an iterative algorithm, you can specify keyword arguments `low` (defaults to -1024),
`high` (defaults to 1024) and `guess` to specify max and min values for the search and the value to
try first. For C-like languages, the header `stddef.h` and `stdio.h` are included implicitly for
native compilation, only `stddef.h` is included when cross-compiling.
POSARGS
expr str, required
The expression to compute.
KWARGS
args list[str]
Used to pass a list of compiler arguments. Defining include paths for headers not in the default
include path via `-Isome/path/to/header` is generally supported, however, usually not recommended.
This is because include directories can also be specified via the `include_directories` or the
`dependency` kwarg (if present). The same is also true for passing libraries to link with `-lfoo`.
dependencies dep | list[dep]
Additionally dependencies required for compiling and / or linking.
guess int
The value to try first.
high int, default: 1024
The max value.
include_directories inc | list[inc], since 0.38.0
Extra directories for header searches.
low int, default: -1024
The min value.
no_builtin_args bool, default: false
When set to `true`, the compiler arguments controlled by built-in configuration options are not
added.
prefix str | list[str]
Used to add `#include`s and other things that are required for the symbol to be declared. Since
1.0.0 an array is accepted too. When an array is passed, the items are concatenated together
separated by a newline. System definitions should be passed via compiler args (eg: `_GNU_SOURCE`
is often required for some symbols to be exposed on Linux, and it should be passed via `args`
keyword argument).
compiler.find_library()
SYNOPSIS
dep compiler.find_library(
libname,
dirs:,
disabler: false,
has_headers:,
header_args:,
header_dependencies:,
header_include_directories:,
header_no_builtin_args: false,
header_prefix:,
header_required:,
required: true,
static: false,
)
DESCRIPTION
Tries to find the library specified in the positional argument.
POSARGS
libname str, required
The library to find.
KWARGS
dirs list[str]
Additional directories to search in.
By default the library is searched for in the system library directory (e.g. /usr/lib). Specifying
more directories here, causes Meson to search in those directories as well as the system
directories.
disabler bool, default: false, since 0.49.0
If `true`, this method will return a disabler on a failed check.
has_headers list[str], since 0.50.0
List of headers that must be found as well. This check is equivalent to checking each header with
a compiler.has_header call.
When used, kwargs that compiler.has_header would accept can be passed here prefixed with `header_`,
and will have the same effect on the header check.
header_args list[str], since 0.51.0
When the `has_headers` kwarg is also used, this argument is passed to compiler.has_header as
`args`.
header_dependencies dep | list[dep], since 0.51.0
When the `has_headers` kwarg is also used, this argument is passed to compiler.has_header as
`dependencies`.
header_include_directories inc | list[inc], since 0.51.0
When the `has_headers` kwarg is also used, this argument is passed to compiler.has_header as
`include_directories`.
header_no_builtin_args bool, default: false, since 0.51.0
When the `has_headers` kwarg is also used, this argument is passed to compiler.has_header as
`no_builtin_args`.
header_prefix str, since 0.51.0
When the `has_headers` kwarg is also used, this argument is passed to compiler.has_header as
`prefix`.
header_required bool | feature, since 0.50.0
When used in conjunction with the has_headers keyword, set the requirement of the headers.
required bool | feature, default: true
If set `true`, Meson will abort with an error if the library could not be found. Otherwise, Meson
will continue and the found method of the returned object will return `false`.
When set to a `feature`[0] option, the feature will control if it is searched and whether to fail
if not found.
(since 0.47.0) The value of a `feature` option can also be passed here.
static bool, default: false, since 0.51.0
If `true`, the search is limited to static libraries only. Setting this value to `false` (the
default) will search for both shared and static libraries.
compiler.first_supported_argument()
SYNOPSIS
list[str] compiler.first_supported_argument(arg...)
since 0.43.0
DESCRIPTION
Given a list of strings, returns a single-element list containing the first argument that passes the
compiler.has_argument test or an empty array if none pass.
VARARGS
arg str, 0...N times
The arguments to check.
compiler.first_supported_link_argument()
SYNOPSIS
list[str] compiler.first_supported_link_argument(arg...)
since 0.46.0
DESCRIPTION
Given a list of strings, returns the first argument that passes the compiler.has_link_argument test
or an empty array if none pass.
VARARGS
arg str, 0...N times
The link arguments to check.
compiler.get_argument_syntax()
SYNOPSIS
str compiler.get_argument_syntax()
since 0.49.0
DESCRIPTION
returns a string identifying the type of arguments the compiler takes. Can be one of `gcc`, `msvc`,
or an undefined string value. This method is useful for identifying compilers that are not gcc or
msvc, but use the same argument syntax as one of those two compilers such as clang or icc, especially
when they use different syntax on different operating systems.
compiler.get_define()
SYNOPSIS
str compiler.get_define(
definename,
args:,
dependencies:,
include_directories:,
no_builtin_args: false,
prefix:,
)
since 0.40.0
DESCRIPTION
Returns the given preprocessor symbol's value as a string or empty string if it is not defined.
(since 0.47.0) This method will concatenate string literals as the compiler would. E.g. `"a" "b"`
will become `"ab"`.
POSARGS
definename str, required
The define to check.
KWARGS
args list[str]
Used to pass a list of compiler arguments. Defining include paths for headers not in the default
include path via `-Isome/path/to/header` is generally supported, however, usually not recommended.
This is because include directories can also be specified via the `include_directories` or the
`dependency` kwarg (if present). The same is also true for passing libraries to link with `-lfoo`.
dependencies dep | list[dep]
Additionally dependencies required for compiling and / or linking.
include_directories inc | list[inc], since 0.38.0
Extra directories for header searches.
no_builtin_args bool, default: false
When set to `true`, the compiler arguments controlled by built-in configuration options are not
added.
prefix str | list[str]
Used to add `#include`s and other things that are required for the symbol to be declared. Since
1.0.0 an array is accepted too. When an array is passed, the items are concatenated together
separated by a newline. System definitions should be passed via compiler args (eg: `_GNU_SOURCE`
is often required for some symbols to be exposed on Linux, and it should be passed via `args`
keyword argument).
compiler.get_id()
SYNOPSIS
str compiler.get_id()
DESCRIPTION
Returns a string identifying the compiler. For example, `gcc`, `msvc`, and more[31].
compiler.get_linker_id()
SYNOPSIS
str compiler.get_linker_id()
since 0.53.0
DESCRIPTION
Returns a string identifying the linker. For example, `ld.bfd`, `link`, and more[32].
compiler.get_supported_arguments()
SYNOPSIS
list[str] compiler.get_supported_arguments(
arg...,
checked: 'off',
)
since 0.43.0
DESCRIPTION
Returns an array containing only the arguments supported by the compiler, as if compiler.has_argument
were called on them individually.
VARARGS
arg str, 0...N times
The arguments to check.
KWARGS
checked str, default: 'off', since 0.59.0
Supported values:
- `'off'`: Quietly ignore unsupported arguments
- `'warn'`: Print a warning for unsupported arguments
- `'require'`: Abort if at least one argument is not supported
compiler.get_supported_function_attributes()
SYNOPSIS
list[str] compiler.get_supported_function_attributes(name...)
since 0.48.0
DESCRIPTION
Returns an array containing any names that are supported GCC style attributes. Equivalent to
compiler.has_function_attribute was called on each of them individually.
VARARGS
name str, 1...N times
The attribute names to check.
compiler.get_supported_link_arguments()
SYNOPSIS
list[str] compiler.get_supported_link_arguments(arg...)
since 0.46.0
DESCRIPTION
Returns an array containing only the arguments supported by the compiler, as if
compiler.has_link_argument were called on them individually.
VARARGS
arg str, 0...N times
The link arguments to check.
compiler.has_argument()
SYNOPSIS
bool compiler.has_argument(argument, required: false)
DESCRIPTION
Returns `true` if the compiler accepts the specified command line argument, that is, can compile code
without erroring out or printing a warning about an unknown flag.
POSARGS
argument str, required
The argument to check.
KWARGS
required bool | feature, default: false, since 1.3.0
When set to `true`, Meson will halt if the check fails. When set to a `feature`[0] option, the
feature will control if it is searched and whether to fail if not found.
compiler.has_define()
SYNOPSIS
bool compiler.has_define(
definename,
args:,
dependencies:,
include_directories:,
no_builtin_args: false,
prefix:,
)
since 1.3.0
DESCRIPTION
Returns true if the given preprocessor symbol is defined.
POSARGS
definename str, required
The define to check.
KWARGS
args list[str]
Used to pass a list of compiler arguments. Defining include paths for headers not in the default
include path via `-Isome/path/to/header` is generally supported, however, usually not recommended.
This is because include directories can also be specified via the `include_directories` or the
`dependency` kwarg (if present). The same is also true for passing libraries to link with `-lfoo`.
dependencies dep | list[dep]
Additionally dependencies required for compiling and / or linking.
include_directories inc | list[inc], since 0.38.0
Extra directories for header searches.
no_builtin_args bool, default: false
When set to `true`, the compiler arguments controlled by built-in configuration options are not
added.
prefix str | list[str]
Used to add `#include`s and other things that are required for the symbol to be declared. Since
1.0.0 an array is accepted too. When an array is passed, the items are concatenated together
separated by a newline. System definitions should be passed via compiler args (eg: `_GNU_SOURCE`
is often required for some symbols to be exposed on Linux, and it should be passed via `args`
keyword argument).
compiler.has_function()
SYNOPSIS
bool compiler.has_function(
funcname,
args:,
dependencies:,
include_directories:,
no_builtin_args: false,
prefix:,
required: false,
)
DESCRIPTION
Returns true if the given function is provided by the standard library or a library passed in with
the `args` keyword.
POSARGS
funcname str, required
The function to check.
KWARGS
args list[str]
Used to pass a list of compiler arguments. Defining include paths for headers not in the default
include path via `-Isome/path/to/header` is generally supported, however, usually not recommended.
This is because include directories can also be specified via the `include_directories` or the
`dependency` kwarg (if present). The same is also true for passing libraries to link with `-lfoo`.
dependencies dep | list[dep]
Additionally dependencies required for compiling and / or linking.
include_directories inc | list[inc], since 0.38.0
Extra directories for header searches.
no_builtin_args bool, default: false
When set to `true`, the compiler arguments controlled by built-in configuration options are not
added.
prefix str | list[str]
Used to add `#include`s and other things that are required for the symbol to be declared. Since
1.0.0 an array is accepted too. When an array is passed, the items are concatenated together
separated by a newline. System definitions should be passed via compiler args (eg: `_GNU_SOURCE`
is often required for some symbols to be exposed on Linux, and it should be passed via `args`
keyword argument).
required bool | feature, default: false, since 1.3.0
When set to `true`, Meson will halt if the check fails. When set to a `feature`[0] option, the
feature will control if it is searched and whether to fail if not found.
compiler.has_function_attribute()
SYNOPSIS
bool compiler.has_function_attribute(
name,
required: false,
)
since 0.48.0
DESCRIPTION
Returns `true` if the compiler supports the GNU style (`__attribute__(...)`) `name`. This is
preferable to manual compile checks as it may be optimized for compilers that do not support such
attributes. This table[33] lists all of the supported attributes.
POSARGS
name str, required
The attribute name to check.
KWARGS
required bool | feature, default: false, since 1.3.0
When set to `true`, Meson will halt if the check fails. When set to a `feature`[0] option, the
feature will control if it is searched and whether to fail if not found.
compiler.has_header()
SYNOPSIS
bool compiler.has_header(
header_name,
args:,
dependencies:,
include_directories:,
no_builtin_args: false,
prefix:,
required: false,
)
DESCRIPTION
Returns true if the specified header is exists with the specified prefix, dependencies, and
arguments.
This method is faster than compiler.check_header since it only does a pre-processor check.
POSARGS
header_name str, required
The header to check.
KWARGS
args list[str]
Used to pass a list of compiler arguments. Defining include paths for headers not in the default
include path via `-Isome/path/to/header` is generally supported, however, usually not recommended.
This is because include directories can also be specified via the `include_directories` or the
`dependency` kwarg (if present). The same is also true for passing libraries to link with `-lfoo`.
dependencies dep | list[dep]
Additionally dependencies required for compiling and / or linking.
include_directories inc | list[inc], since 0.38.0
Extra directories for header searches.
no_builtin_args bool, default: false
When set to `true`, the compiler arguments controlled by built-in configuration options are not
added.
prefix str | list[str]
Used to add `#include`s and other things that are required for the symbol to be declared. Since
1.0.0 an array is accepted too. When an array is passed, the items are concatenated together
separated by a newline. System definitions should be passed via compiler args (eg: `_GNU_SOURCE`
is often required for some symbols to be exposed on Linux, and it should be passed via `args`
keyword argument).
required bool | feature, default: false, since 0.50.0
When set to `true`, Meson will halt if the header check fails. When set to a `feature`[0] option,
the feature will control if it is searched and whether to fail if not found.
compiler.has_header_symbol()
SYNOPSIS
bool compiler.has_header_symbol(
header,
symbol,
args:,
dependencies:,
include_directories:,
no_builtin_args: false,
prefix:,
required: false,
)
DESCRIPTION
Detects whether a particular symbol is declared in the specified header.
Symbols here include function, variable, `#define`, type definition, etc.
POSARGS
header str, required
The header to check.
symbol str, required
The symbol to check.
KWARGS
args list[str]
Used to pass a list of compiler arguments. Defining include paths for headers not in the default
include path via `-Isome/path/to/header` is generally supported, however, usually not recommended.
This is because include directories can also be specified via the `include_directories` or the
`dependency` kwarg (if present). The same is also true for passing libraries to link with `-lfoo`.
dependencies dep | list[dep]
Additionally dependencies required for compiling and / or linking.
include_directories inc | list[inc], since 0.38.0
Extra directories for header searches.
no_builtin_args bool, default: false
When set to `true`, the compiler arguments controlled by built-in configuration options are not
added.
prefix str | list[str]
Used to add `#include`s and other things that are required for the symbol to be declared. Since
1.0.0 an array is accepted too. When an array is passed, the items are concatenated together
separated by a newline. System definitions should be passed via compiler args (eg: `_GNU_SOURCE`
is often required for some symbols to be exposed on Linux, and it should be passed via `args`
keyword argument).
required bool | feature, default: false, since 0.50.0
When set to `true`, Meson will halt if the header check fails. When set to a `feature`[0] option,
the feature will control if it is searched and whether to fail if not found.
compiler.has_link_argument()
SYNOPSIS
bool compiler.has_link_argument(argument, required: false)
since 0.46.0
DESCRIPTION
Returns `true` if the linker accepts the specified command line argument, that is, can compile and
link code without erroring out or printing a warning about an unknown flag. Link arguments will be
passed to the compiler, so should usually have the `-Wl,` prefix. On VisualStudio a `/link` argument
will be prepended.
POSARGS
argument str, required
The argument to check.
KWARGS
required bool | feature, default: false, since 1.3.0
When set to `true`, Meson will halt if the check fails. When set to a `feature`[0] option, the
feature will control if it is searched and whether to fail if not found.
compiler.has_member()
SYNOPSIS
bool compiler.has_member(
typename,
membername,
args:,
dependencies:,
include_directories:,
no_builtin_args: false,
prefix:,
required: false,
)
DESCRIPTION
Returns true if the type has the specified member.
POSARGS
typename str, required
The type to check.
membername str, required
The member to check.
KWARGS
args list[str]
Used to pass a list of compiler arguments. Defining include paths for headers not in the default
include path via `-Isome/path/to/header` is generally supported, however, usually not recommended.
This is because include directories can also be specified via the `include_directories` or the
`dependency` kwarg (if present). The same is also true for passing libraries to link with `-lfoo`.
dependencies dep | list[dep]
Additionally dependencies required for compiling and / or linking.
include_directories inc | list[inc], since 0.38.0
Extra directories for header searches.
no_builtin_args bool, default: false
When set to `true`, the compiler arguments controlled by built-in configuration options are not
added.
prefix str | list[str]
Used to add `#include`s and other things that are required for the symbol to be declared. Since
1.0.0 an array is accepted too. When an array is passed, the items are concatenated together
separated by a newline. System definitions should be passed via compiler args (eg: `_GNU_SOURCE`
is often required for some symbols to be exposed on Linux, and it should be passed via `args`
keyword argument).
required bool | feature, default: false, since 1.3.0
When set to `true`, Meson will halt if the check fails. When set to a `feature`[0] option, the
feature will control if it is searched and whether to fail if not found.
compiler.has_members()
SYNOPSIS
bool compiler.has_members(
typename,
member...,
args:,
dependencies:,
include_directories:,
no_builtin_args: false,
prefix:,
required: false,
)
DESCRIPTION
Returns `true` if the type has all the specified members.
POSARGS
typename str, required
The type to check.
VARARGS
member str, 1...N times
The members to check
KWARGS
args list[str]
Used to pass a list of compiler arguments. Defining include paths for headers not in the default
include path via `-Isome/path/to/header` is generally supported, however, usually not recommended.
This is because include directories can also be specified via the `include_directories` or the
`dependency` kwarg (if present). The same is also true for passing libraries to link with `-lfoo`.
dependencies dep | list[dep]
Additionally dependencies required for compiling and / or linking.
include_directories inc | list[inc], since 0.38.0
Extra directories for header searches.
no_builtin_args bool, default: false
When set to `true`, the compiler arguments controlled by built-in configuration options are not
added.
prefix str | list[str]
Used to add `#include`s and other things that are required for the symbol to be declared. Since
1.0.0 an array is accepted too. When an array is passed, the items are concatenated together
separated by a newline. System definitions should be passed via compiler args (eg: `_GNU_SOURCE`
is often required for some symbols to be exposed on Linux, and it should be passed via `args`
keyword argument).
required bool | feature, default: false, since 1.3.0
When set to `true`, Meson will halt if the check fails. When set to a `feature`[0] option, the
feature will control if it is searched and whether to fail if not found.
compiler.has_multi_arguments()
SYNOPSIS
bool compiler.has_multi_arguments(arg..., required: false)
since 0.37.0
DESCRIPTION
the same as compiler.has_argument but takes multiple arguments and uses them all in a single compiler
invocation.
VARARGS
arg str, 0...N times
The arguments to check.
KWARGS
required bool | feature, default: false, since 1.3.0
When set to `true`, Meson will halt if the check fails. When set to a `feature`[0] option, the
feature will control if it is searched and whether to fail if not found.
compiler.has_multi_link_arguments()
SYNOPSIS
bool compiler.has_multi_link_arguments(
arg...,
required: false,
)
since 0.46.0
DESCRIPTION
the same as compiler.has_link_argument but takes multiple arguments and uses them all in a single
compiler invocation.
VARARGS
arg str, 0...N times
The link arguments to check.
KWARGS
required bool | feature, default: false, since 1.3.0
When set to `true`, Meson will halt if the check fails. When set to a `feature`[0] option, the
feature will control if it is searched and whether to fail if not found.
compiler.has_type()
SYNOPSIS
bool compiler.has_type(
typename,
args:,
dependencies:,
include_directories:,
no_builtin_args: false,
prefix:,
required: false,
)
DESCRIPTION
Returns `true` if the specified token is a type.
POSARGS
typename str, required
The type to check.
KWARGS
args list[str]
Used to pass a list of compiler arguments. Defining include paths for headers not in the default
include path via `-Isome/path/to/header` is generally supported, however, usually not recommended.
This is because include directories can also be specified via the `include_directories` or the
`dependency` kwarg (if present). The same is also true for passing libraries to link with `-lfoo`.
dependencies dep | list[dep]
Additionally dependencies required for compiling and / or linking.
include_directories inc | list[inc], since 0.38.0
Extra directories for header searches.
no_builtin_args bool, default: false
When set to `true`, the compiler arguments controlled by built-in configuration options are not
added.
prefix str | list[str]
Used to add `#include`s and other things that are required for the symbol to be declared. Since
1.0.0 an array is accepted too. When an array is passed, the items are concatenated together
separated by a newline. System definitions should be passed via compiler args (eg: `_GNU_SOURCE`
is often required for some symbols to be exposed on Linux, and it should be passed via `args`
keyword argument).
required bool | feature, default: false, since 1.3.0
When set to `true`, Meson will halt if the check fails. When set to a `feature`[0] option, the
feature will control if it is searched and whether to fail if not found.
compiler.links()
SYNOPSIS
bool compiler.links(
code,
args:,
dependencies:,
include_directories:,
name:,
no_builtin_args: false,
required: false,
werror: false,
)
DESCRIPTION
Returns true if the code compiles and links.
Since 0.60.0, if the `file` object's suffix does not match the compiler object's language, the
compiler corresponding to the suffix is used to compile the source, while the target of the `links`
method is used to link the resulting object file.
POSARGS
code str | file, required
The source code to check.
If a string is passed, the code is used directly. If a file object is passed, its content is used
for the compiler check.
KWARGS
args list[str]
Used to pass a list of compiler arguments. Defining include paths for headers not in the default
include path via `-Isome/path/to/header` is generally supported, however, usually not recommended.
This is because include directories can also be specified via the `include_directories` or the
`dependency` kwarg (if present). The same is also true for passing libraries to link with `-lfoo`.
dependencies dep | list[dep]
Additionally dependencies required for compiling and / or linking.
include_directories inc | list[inc], since 0.38.0
Extra directories for header searches.
name str
The name to use for printing a message about the compiler check. If this keyword argument is not
passed, no message will be printed about the check.
no_builtin_args bool, default: false
When set to `true`, the compiler arguments controlled by built-in configuration options are not
added.
required bool | feature, default: false, since 1.5.0
When set to `true`, Meson will halt if the check fails. When set to a `feature`[0] option, the
feature will control if it is searched and whether to fail if not found.
werror bool, default: false, since 1.3.0
When set to `true`, compiler warnings are treated as error.
compiler.preprocess()
SYNOPSIS
list[custom_idx] compiler.preprocess(
source...,
compile_args:,
dependencies:,
depends:,
include_directories:,
output:,
)
since 0.64.0
DESCRIPTION
Preprocess a list of source files but do not compile them. The preprocessor will receive the same
arguments (include directories, defines, etc) as with normal compilation. That includes for example
args added with `add_project_arguments()`, or on the command line with `-Dc_args=-DFOO`.
VARARGS
source str | file | custom_tgt | custom_idx | generated_list, 0...N times
Input source to preprocess. The following types are supported:
- Strings relative to the current source directory
- file objects defined in any preceding build file
- The return value of configure-time generators such as configure_file
- The return value of build-time generators such as custom_target or generator.process
KWARGS
compile_args list[str]
Extra flags to pass to the preprocessor
dependencies dep | list[dep], since 1.1.0
Additionally dependencies required.
depends list[build_tgt | custom_tgt], since 1.4.0
Specifies that this target depends on the specified target(s). These targets should be built before
starting to preprocess an input.
include_directories inc | list[inc], since 0.38.0
Extra directories for header searches.
output str
Template for name of preprocessed files: `@PLAINNAME@` is replaced by the source filename and
`@BASENAME@` is replaced by the source filename without its extension.
compiler.run()
SYNOPSIS
runresult compiler.run(
code,
args:,
dependencies:,
include_directories:,
name:,
no_builtin_args: false,
required: false,
werror: false,
)
DESCRIPTION
Attempts to compile and execute the given code fragment.
POSARGS
code str | file, required
The source code to check.
If a string is passed, the code is used directly. If a file object is passed, its content is used
for the compiler check.
KWARGS
args list[str]
Used to pass a list of compiler arguments. Defining include paths for headers not in the default
include path via `-Isome/path/to/header` is generally supported, however, usually not recommended.
This is because include directories can also be specified via the `include_directories` or the
`dependency` kwarg (if present). The same is also true for passing libraries to link with `-lfoo`.
dependencies dep | list[dep]
Additionally dependencies required for compiling and / or linking.
include_directories inc | list[inc], since 0.38.0
Extra directories for header searches.
name str
The name to use for printing a message about the compiler check. If this keyword argument is not
passed, no message will be printed about the check.
no_builtin_args bool, default: false
When set to `true`, the compiler arguments controlled by built-in configuration options are not
added.
required bool | feature, default: false, since 1.5.0
When set to `true`, Meson will halt if the check fails. When set to a `feature`[0] option, the
feature will control if it is searched and whether to fail if not found.
werror bool, default: false, since 1.3.0
When set to `true`, compiler warnings are treated as error.
compiler.sizeof()
SYNOPSIS
int compiler.sizeof(
typename,
args:,
dependencies:,
include_directories:,
no_builtin_args: false,
prefix:,
)
DESCRIPTION
returns the size of the given type (e.g. `'int'`) or -1 if the type is unknown. For C-like
languages, the header `stddef.h` and `stdio.h` are included implicitly for native compilation, only
`stddef.h` is included when cross-compiling.
POSARGS
typename str, required
The type to compute.
KWARGS
args list[str]
Used to pass a list of compiler arguments. Defining include paths for headers not in the default
include path via `-Isome/path/to/header` is generally supported, however, usually not recommended.
This is because include directories can also be specified via the `include_directories` or the
`dependency` kwarg (if present). The same is also true for passing libraries to link with `-lfoo`.
dependencies dep | list[dep]
Additionally dependencies required for compiling and / or linking.
include_directories inc | list[inc], since 0.38.0
Extra directories for header searches.
no_builtin_args bool, default: false
When set to `true`, the compiler arguments controlled by built-in configuration options are not
added.
prefix str | list[str]
Used to add `#include`s and other things that are required for the symbol to be declared. Since
1.0.0 an array is accepted too. When an array is passed, the items are concatenated together
separated by a newline. System definitions should be passed via compiler args (eg: `_GNU_SOURCE`
is often required for some symbols to be exposed on Linux, and it should be passed via `args`
keyword argument).
compiler.symbols_have_underscore_prefix()
SYNOPSIS
bool compiler.symbols_have_underscore_prefix()
since 0.37.0
DESCRIPTION
Returns `true` if the C symbol mangling is one underscore (`_`) prefixed to the symbol.
compiler.version()
SYNOPSIS
str compiler.version()
DESCRIPTION
Returns the compiler's version number as a string.
custom_idx.full_path()
SYNOPSIS
str custom_idx.full_path()
since 0.54.0
DESCRIPTION
Returns a full path pointing to the result target file NOTE: In most cases using the object itself
will do the same job as this and will also allow Meson to setup inter-target dependencies correctly.
Please file a bug if that doesn't work for you.
See custom_tgt.full_path
custom_tgt.[index]()
SYNOPSIS
custom_idx custom_tgt.[index]()
DESCRIPTION
Returns an opaque object that references this target, and can be used as a source in other targets.
When it is used as such it will make that target depend on this custom target, but the only source
added will be the one that corresponds to the index of the custom target's output argument.
custom_tgt.full_path()
SYNOPSIS
str custom_tgt.full_path()
DESCRIPTION
Returns a full path pointing to the result target file NOTE: In most cases using the object itself
will do the same job as this and will also allow Meson to setup inter-target dependencies correctly.
Please file a bug if that doesn't work for you. (since 0.54.0) It can be also called on indexes
objects: `custom_targets[i].full_path()`.
custom_tgt.to_list()
SYNOPSIS
list[custom_idx] custom_tgt.to_list()
since 0.54.0
DESCRIPTION
Returns a list of opaque objects that references this target, and can be used as a source in other
targets. This can be used to iterate outputs with `foreach` loop.
dep.as_link_whole()
SYNOPSIS
dep dep.as_link_whole()
since 0.56.0
DESCRIPTION
Only dependencies created with declare_dependency, returns a copy of the dependency object with all
link_with arguments changed to link_whole. This is useful for example for fallback dependency from a
subproject built with `default_library=static`. Note that all `link_with` objects must be static
libraries otherwise an error will be raised when trying to `link_whole` a shared library.
dep.as_system()
SYNOPSIS
dep dep.as_system([value])
since 0.52.0
DESCRIPTION
Returns a copy of the dependency object, which has changed the value of `include_type` to `value`.
The `value` argument is optional and defaults to `'system'`.
OPTARGS
value str
The new value. See dependency for supported values.
dep.found()
SYNOPSIS
bool dep.found()
DESCRIPTION
Returns whether the dependency was found.
dep.get_configtool_variable()
SYNOPSIS
str dep.get_configtool_variable(var_name)
deprecated since 0.56.0, since 0.44.0
DESCRIPTION
Gets the command line argument from the config tool (with `--` prepended), or, if invoked on a non
config-tool dependency, error out.
POSARGS
var_name str, required
Name of the variable to query
dep.get_pkgconfig_variable()
SYNOPSIS
str dep.get_pkgconfig_variable(
var_name,
default:,
define_variable:,
)
deprecated since 0.56.0, since 0.36.0
DESCRIPTION
Gets the pkg-config variable specified, or, if invoked on a non pkg-config dependency, error out.
POSARGS
var_name str, required
Name of the variable to query
KWARGS
default str, since 0.45.0
The value to return if the variable was not found. A warning is issued if the variable is not
defined and this kwarg is not set.
define_variable list[str], since 0.44.0
You can also redefine a variable by passing a list to this kwarg that can affect the retrieved
variable: `['prefix', '/'])`.
(Since 1.3.0) Multiple variables can be specified in pairs.
dep.get_variable()
SYNOPSIS
str dep.get_variable(
[varname],
cmake:,
configtool:,
default_value:,
internal:,
pkgconfig:,
pkgconfig_define:,
)
since 0.51.0
DESCRIPTION
A generic variable getter method, which replaces the `get_type_variable` methods. This allows one to
get the variable from a dependency without knowing specifically how that dependency was found. If
`default_value` is set and the value cannot be gotten from the object then `default_value` is
returned, if it is not set then an error is raised.
OPTARGS
varname str, since 0.58.0
This argument is used as a default value for `cmake`, `pkgconfig`, `configtool` and `internal`
keyword arguments. It is useful in the common case where `pkgconfig` and `internal` use the same
variable name, in which case it's easier to write `dep.get_variable('foo')` instead of
`dep.get_variable(pkgconfig: 'foo', internal: 'foo')`.
KWARGS
cmake str
The CMake variable name
configtool str
The configtool variable name
default_value str
The default value to return when the variable does not exist
internal str, since 0.54.0
The internal variable name
pkgconfig str
The pkgconfig variable name
pkgconfig_define list[str]
See dep.get_pkgconfig_variable
WARNINGS
Before 1.3.0, specifying multiple pkgconfig_define pairs would silently malform the results. Only the
first variable would be redefined, but its value would contain both the second variable name, as well
as its value.
dep.include_type()
SYNOPSIS
str dep.include_type()
since 0.52.0
DESCRIPTION
Returns the value set by the `include_type` kwarg.
dep.name()
SYNOPSIS
str dep.name()
since 0.48.0
DESCRIPTION
Returns the name of the dependency that was searched. Returns `'internal'` for dependencies created
with declare_dependency.
NOTE: This was not implemented for dep objects returned by compiler.find_library until Meson 1.5.0
dep.partial_dependency()
SYNOPSIS
dep dep.partial_dependency(
compile_args: false,
includes: false,
link_args: false,
links: false,
sources: false,
)
since 0.46.0
DESCRIPTION
Returns a new dependency object with the same name, version, found status, type name, and methods as
the object that called it. This new object will only inherit other attributes from its parent as
controlled by keyword arguments.
If the parent has any dependencies, those will be applied to the new partial dependency with the same
rules. So, given:
dep1 = declare_dependency(compile_args : '-Werror=foo', link_with : 'libfoo')
dep2 = declare_dependency(compile_args : '-Werror=bar', dependencies : dep1)
dep3 = dep2.partial_dependency(compile_args : true)
dep3 will add `['-Werror=foo', '-Werror=bar']` to the compiler args of any target it is added to, but
libfoo will not be added to the link_args.
The following arguments will add the following attributes:
- compile_args: any arguments passed to the compiler
- link_args: any arguments passed to the linker
- links: anything passed via link_with or link_whole
- includes: any include_directories
- sources: any compiled or static sources the dependency has
KWARGS
compile_args bool, default: false
Whether to include compile_args
includes bool, default: false
Whether to include includes
link_args bool, default: false
Whether to include link_args
links bool, default: false
Whether to include links
sources bool, default: false
Whether to include sources
WARNINGS
A bug present until 0.50.1 results in the above behavior not working correctly.
dep.type_name()
SYNOPSIS
str dep.type_name()
DESCRIPTION
Returns a string describing the type of the dependency, the most common values are `internal` for
deps created with declare_dependency and `pkgconfig` for system dependencies obtained with Pkg-
config.
dep.version()
SYNOPSIS
str dep.version()
DESCRIPTION
the version number as a string, for example `1.2.8`. `unknown` if the dependency provider doesn't
support determining the version.
dict.get()
SYNOPSIS
any dict.get(key, [fallback])
DESCRIPTION
returns the value for the key given as first argument if it is present in the dictionary, or the
optional fallback value given as the second argument. If a single argument was given and the key was
not found, causes a fatal error
POSARGS
key str, required
The key to query.
OPTARGS
fallback any
Fallback value that is returned if the key is not in the dict.
dict.has_key()
SYNOPSIS
bool dict.has_key(key)
DESCRIPTION
Returns `true` if the dictionary contains the key given as argument, `false` otherwise.
POSARGS
key str, required
The key to query.
dict.keys()
SYNOPSIS
list[str] dict.keys()
DESCRIPTION
Returns an array of keys in the dictionary.
disabler.found()
SYNOPSIS
bool disabler.found()
DESCRIPTION
Always returns `false`
env.append()
SYNOPSIS
void env.append(variable, Value..., separator:)
DESCRIPTION
appends the given values to the old value of the environment variable, e.g. `env.append('FOO',
´BAR', 'BAZ', separator : ';')` produces `BOB;BAR;BAZ` if `FOO` had the value `BOB` and plain
`BAR;BAZ` if the value was not defined.
POSARGS
variable str, required
The variable to modify
VARARGS
Value str, 0...N times
The values to append
KWARGS
separator str
The separator to use. If not explicitly specified, the default path separator for the host
operating system will be used, i.e. ';' for Windows and ':' for UNIX/POSIX systems.
env.prepend()
SYNOPSIS
void env.prepend(variable, Value..., separator:)
DESCRIPTION
Same as `append` except that it writes to the beginning of the variable.
POSARGS
variable str, required
The variable to modify
VARARGS
Value str, 0...N times
The values to prepend
KWARGS
separator str
The separator to use. If not explicitly specified, the default path separator for the host
operating system will be used, i.e. ';' for Windows and ':' for UNIX/POSIX systems.
env.set()
SYNOPSIS
void env.set(variable, Value..., separator:)
DESCRIPTION
Sets the environment variable specified in the first argument to the values in the varargs joined by
the separator. For instance, `env.set('FOO', 'BAR'),` sets envvar `FOO` to value `BAR`.
POSARGS
variable str, required
The variable to modify
VARARGS
Value str, 0...N times
The values to set
KWARGS
separator str
The separator to use. If not explicitly specified, the default path separator for the host
operating system will be used, i.e. ';' for Windows and ':' for UNIX/POSIX systems.
env.unset()
SYNOPSIS
void env.unset()
since 1.4.0
DESCRIPTION
Unset the specified environment variable. If this variable does not exist, nothing happens.
external_program.found()
SYNOPSIS
bool external_program.found()
DESCRIPTION
Returns whether the executable was found.
external_program.full_path()
SYNOPSIS
str external_program.full_path()
since 0.55.0
DESCRIPTION
Returns a string pointing to the script or executable.
NOTE: You should not usually need to use this method. Passing the object itself should work in most
contexts where a program can appear, and allows Meson to setup inter-target dependencies correctly
(for example in cases where a program might be overridden by a build_tgt). Only use this if you
specifically need a string, such as when embedding a program path into a header file, or storing it
into an environment variable.
For example:
run_command(find_program('foo'), 'arg1', 'arg2')
external_program.path()
SYNOPSIS
str external_program.path()
deprecated since 0.55.0
DESCRIPTION
Deprecated: Use external_program.full_path instead.
Returns a string pointing to the script or executable.
NOTE: You should not usually need to use this method. Passing the object itself should work in most
contexts where a program can appear, and allows Meson to setup inter-target dependencies correctly
(for example in cases where a program might be overridden by a build_tgt). Only use this if you
specifically need a string, such as when embedding a program path into a header file, or storing it
into an environment variable.
For example:
run_command(find_program('foo'), 'arg1', 'arg2')
external_program.version()
SYNOPSIS
str external_program.version()
since 0.62.0
DESCRIPTION
The version number as a string, for example `1.2.8`.
`unknown` if the program cannot determine the version via a `--version` argument.
feature.allowed()
SYNOPSIS
bool feature.allowed()
since 0.59.0
DESCRIPTION
Returns whether the feature was set to `'enabled'` or `'auto'`
feature.auto()
SYNOPSIS
bool feature.auto()
DESCRIPTION
Returns whether the feature was set to `'auto'`
feature.disable_auto_if()
SYNOPSIS
feature feature.disable_auto_if(value)
since 0.59.0
DESCRIPTION
Returns the feature, with `'auto'` converted to `'disabled'` if value is true.
| Feature | `value = true` | `value = false` | | -------- | -------------- | --------------- | |
Auto | Disabled | Auto | | Enabled | Enabled | Enabled | |
Disabled | Disabled | Disabled |
POSARGS
value bool, required
See the table above
EXAMPLE
`disable_auto_if` is useful to give precedence to mutually exclusive dependencies (that provide the
same API) if either or both are available:
# '-Dfoo=auto -Dbar=enabled' will not pick foo even if installed.
use_bar = get_option('bar')
use_foo = get_option('foo').disable_auto_if(use_bar.enabled())
dep_foo = dependency('foo', required: use_foo)
if not dep_foo.found()
dep_foo = dependency('bar', required: use_bar)
endif
feature.disable_if()
SYNOPSIS
feature feature.disable_if(value, error_message: '')
since 1.1.0
DESCRIPTION
Returns the object itself if the value is false; an error if the object is `'enabled'` and the value
is true; a disabled feature if the object is `'auto'` or `'disabled'` and the value is true.
| Feature | `value = true` | `value = false` | | -------- | -------------- | --------------- | |
Auto | Disabled | Auto | | Enabled | Error | Enabled | |
Disabled | Disabled | Disabled |
This is equivalent to `feature_opt.require(not condition)`, but may make code easier to reason about,
especially when mixed with `enable_if`
POSARGS
value bool, required
The value to check
KWARGS
error_message str, default: ''
The error message to print if the check fails
EXAMPLE
`disable_if` is useful to restrict the applicability of `'auto'` features, particularly when passing
them to dependency:
use_os_feature = get_option('foo') .br
.disable_if(host_machine.system() == 'darwin', error_message : 'os feature not supported on
MacOS')
dep_os_feature = dependency('os_feature', required: use_os_feature)
feature.disabled()
SYNOPSIS
bool feature.disabled()
DESCRIPTION
Returns whether the feature was set to `'disabled'`
feature.enable_auto_if()
SYNOPSIS
feature feature.enable_auto_if(value)
since 1.1.0
DESCRIPTION
Returns the feature, with `'auto'` converted to `'enabled'` if value is true.
| Feature | `value = true` | `value = false` | | -------- | -------------- | --------------- | |
Auto | Enabled | Auto | | Enabled | Enabled | Enabled | |
Disabled | Disabled | Disabled |
POSARGS
value bool, required
See the table above
feature.enable_if()
SYNOPSIS
feature feature.enable_if(value, error_message: '')
since 1.1.0
DESCRIPTION
Returns the object itself if the value is false; an error if the object is `'disabled'` and the value
is true; an enabled feature if the object is `'auto'` or `'enabled'` and the value is true.
| Feature | `value = true` | `value = false` | | -------- | -------------- | --------------- | |
Auto | Enabled | Auto | | Enabled | Enabled | Enabled | |
Disabled | Error | Disabled |
POSARGS
value bool, required
The value to check
KWARGS
error_message str, default: ''
The error message to print if the check fails
EXAMPLE
`enable_if` is useful to restrict the applicability of `'auto'` features, particularly when passing
them to dependency:
use_llvm = get_option('llvm').enable_if(with_clang).enable_if(with_llvm_libs)
dep_llvm = dependency('llvm', required: use_llvm)
feature.enabled()
SYNOPSIS
bool feature.enabled()
DESCRIPTION
Returns whether the feature was set to `'enabled'`
feature.require()
SYNOPSIS
feature feature.require(value, error_message: '')
since 0.59.0
DESCRIPTION
Returns the object itself if the value is true; an error if the object is `'enabled'` and the value
is false; a disabled feature if the object is `'auto'` or `'disabled'` and the value is false.
| Feature | `value = true` | `value = false` | | -------- | -------------- | --------------- | |
Auto | Auto | Disabled | | Enabled | Enabled | Error | |
Disabled | Disabled | Disabled |
POSARGS
value bool, required
The value to check
KWARGS
error_message str, default: ''
The error message to print if the check fails
EXAMPLE
`require` is useful to restrict the applicability of `'auto'` features, for example based on other
features or on properties of the host machine:
if get_option('directx').require(host_machine.system() == 'windows',
error_message: 'DirectX only available on Windows').allowed() then
src += ['directx.c']
config.set10('HAVE_DIRECTX', true)
endif
file.full_path()
SYNOPSIS
str file.full_path()
since 1.4.0
DESCRIPTION
Returns a full path pointing to the file. This is useful for printing the path with e.g message
function for debugging purpose. NOTE: In most cases using the object itself will do the same job as
this and will also allow Meson to setup dependencies correctly.
generator.process()
SYNOPSIS
generated_list generator.process(
source...,
env:,
extra_args:,
preserve_path_from:,
)
DESCRIPTION
Takes a list of files, causes them to be processed and returns an object containing the result which
can then, for example, be passed into a build target definition.
VARARGS
source str | file | custom_tgt | custom_idx | generated_list, 1...N times
List of sources to process.
KWARGS
env env | list[str] | dict[str], since 1.3.0
environment variables to set, such as `{'NAME1': 'value1', 'NAME2': 'value2'}` or `['NAME1=value1',
'NAME2=value2']`, or an env object which allows more sophisticated environment juggling.
extra_args list[str]
If present, will be used to replace an entry `@EXTRA_ARGS@` in the argument list.
preserve_path_from str, since 0.45.0
If given, specifies that the output files need to maintain their directory structure inside the
target temporary directory. The most common value for this is `meson.current_source_dir()`. With
this value when a file called `subdir/one.input` is processed it generates a file `{target private
directory}/subdir/one.out` as opposed to `{target private directory}/one.out`.
int.is_even()
SYNOPSIS
bool int.is_even()
DESCRIPTION
Returns true if the number is even.
int.is_odd()
SYNOPSIS
bool int.is_odd()
DESCRIPTION
Returns true if the number is odd
int.to_string()
SYNOPSIS
str int.to_string([fill])
DESCRIPTION
Returns the value of the number as a string.
OPTARGS
fill int
Left fill the string with zeros until it reaches the length specified by this argument. A leading
negative sign counts towards the length, and is handled by inserting the padding after the `-`
character rather than before. The original string is returned if the value provided is less than or
equal to the former's length.
list.contains()
SYNOPSIS
bool list.contains(item)
DESCRIPTION
Returns `true` if the array contains the object given as argument, `false` otherwise
POSARGS
item any, required
The item to check
list.get()
SYNOPSIS
any list.get(index, [fallback])
DESCRIPTION
returns the object at the given index, negative indices count from the back of the array, indexing
out of bounds returns the `fallback` value (since 0.38.0) or, if it is not specified, causes a fatal
error
POSARGS
index int, required
Index of the list position to query. Negative values start at the end of the list
OPTARGS
fallback any
Fallback value that is returned if the index is out of range.
list.length()
SYNOPSIS
int list.length()
DESCRIPTION
Returns the current size of the array / list.
meson.add_devenv()
SYNOPSIS
void meson.add_devenv(env, method:, separator:)
since 0.58.0
DESCRIPTION
add an env object (returned by environment) to the list of environments that will be applied when
using `meson devenv`[34] command line.
This is useful for developers who wish to use the project without installing it, it is often needed
to set for example the path to plugins directory, etc. Alternatively, a list or dictionary can be
passed as first argument.
devenv = environment()
devenv.set('PLUGINS_PATH', meson.current_build_dir())
meson.add_devenv(devenv)
After configuring and compiling that project, a terminal can be opened with the environment set:
sh
$ meson devenv -C <builddir>
$ echo $PLUGINS_PATH
/path/to/source/subdir
See `meson devenv`[33] command documentation for a list of environment variables that are set by
default by Meson.
POSARGS
env env | str | list[str] | dict[str] | dict[list[str]], required
The env object to add. Since 0.62.0 list of strings is allowed in dictionary values. In that case
values are joined using the separator.
KWARGS
method str, since 0.62.0
Must be one of 'set', 'prepend', or 'append' (defaults to 'set'). Controls if initial values
defined in the first positional argument are prepended, appended or replace the current value of
the environment variable.
separator str, since 0.62.0
The separator to use for the initial values defined in the first positional argument. If not
explicitly specified, the default path separator for the host operating system will be used, i.e.
';' for Windows and ':' for UNIX/POSIX systems.
meson.add_dist_script()
SYNOPSIS
void meson.add_dist_script(script_name, arg...)
since 0.48.0
DESCRIPTION
Causes the script given as argument to run during `dist` operation after the distribution source has
been generated but before it is archived. Note that this runs the script file that is in the
_staging_ directory, not the one in the source directory. If the script file cannot be found in the
staging directory, it is a hard error. The `MESON_DIST_ROOT` environment variables is set when dist
scripts is run.
(since 0.54.0) The `MESON_SOURCE_ROOT` and `MESON_BUILD_ROOT` environment variables are set when dist
scripts are run. They are path to the root source and build directory of the main project, even when
the script comes from a subproject.
(since 0.58.0) This command can be invoked from a subproject, it was a hard error in earlier
versions. Subproject dist scripts will only be executed when running `meson dist --include-
subprojects`. `MESON_PROJECT_SOURCE_ROOT`, `MESON_PROJECT_BUILD_ROOT` and `MESON_PROJECT_DIST_ROOT`
environment variables are set when dist scripts are run. They are identical to `MESON_SOURCE_ROOT`,
`MESON_BUILD_ROOT` and `MESON_DIST_ROOT` for main project scripts, but for subproject scripts they
have the path to the root of the subproject appended, usually `subprojects/<subproject-name>`.
(since 1.4.0) The `MESONREWRITE` environment variable contains the path to the rewrite command that
corresponds to the `meson` executable that was used to configure the build. (This might be a
different path than the first executable found in `PATH`.) It can be used to remove or replace any
run_command that depends on the revision control system from the build configuration. Note that the
value will contain many parts. For example, it may be `python3 /path/to/meson.py introspect`. The
user is responsible for splitting the string to an array if needed by splitting lexically like a UNIX
shell would. If your script uses Python, `shlex.split()` is the easiest correct way to do this.
POSARGS
script_name str | file | external_program, required
The script to execute.
(since 0.55.0) The output of find_program as well as strings are accepted.
(since 0.57.0) file objects and the output of configure_file may be used.
VARARGS
arg str | file | external_program, 0...N times, since 0.49.0
Additional arguments
(since 0.55.0) The output of configure_file, files, and find_program as well as strings are
accepted.
meson.add_install_script()
SYNOPSIS
void meson.add_install_script(
script_name,
arg...,
dry_run: false,
install_tag:,
skip_if_destdir: false,
)
DESCRIPTION
Causes the script given as an argument to be run during the install step, this script will have the
environment variables `MESON_SOURCE_ROOT`, `MESON_BUILD_ROOT`, `MESON_INSTALL_PREFIX`,
`MESON_INSTALL_DESTDIR_PREFIX`, and `MESONINTROSPECT` set. All positional arguments are passed as
parameters.
(since 0.54.0) If `meson install` is called with the `--quiet` option, the environment variable
`MESON_INSTALL_QUIET` will be set.
(since 1.1.0) If `meson install` is called with the `--dry-run` option, the environment variable
`MESON_INSTALL_DRY_RUN` will be set.
Meson uses the `DESTDIR` environment variable as set by the inherited environment to determine the
(temporary) installation location for files. Your install script must be aware of this while
manipulating and installing files. The correct way to handle this is with the
`MESON_INSTALL_DESTDIR_PREFIX` variable which is always set and contains `DESTDIR` (if set) and
`prefix` joined together. This is useful because both are usually absolute paths and there are
platform-specific edge-cases in joining two absolute paths.
In case it is needed, `MESON_INSTALL_PREFIX` is also always set and has the value of the `prefix`
option passed to Meson.
`MESONINTROSPECT` contains the path to the introspect command that corresponds to the `meson`
executable that was used to configure the build. (This might be a different path than the first
executable found in `PATH`.) It can be used to query build configuration. Note that the value will
contain many parts, f.ex., it may be `python3 /path/to/meson.py introspect`. The user is responsible
for splitting the string to an array if needed by splitting lexically like a UNIX shell would. If
your script uses Python, `shlex.split()` is the easiest correct way to do this.
POSARGS
script_name str | file | external_program | exe, required
The script to execute.
(since 0.55.0) The output of find_program, executable, custom_target, as well as strings are
accepted.
(since 0.57.0) file objects and the output of configure_file may be used.
VARARGS
arg str | file | external_program | exe | custom_tgt | custom_idx, 0...N times, since 0.49.0
Additional arguments
(since 0.55.0) The output of find_program, executable, custom_target, as well as strings are
accepted.
KWARGS
dry_run bool, default: false, since 1.1.0
If `true` the script will be run even if `--dry-run` option is provided to the `meson install`
command. The script can use the `MESON_INSTALL_DRY_RUN` variable to determine if it is in dry run
mode or not.
install_tag str, since 0.60.0
A string used by the `meson install --tags` command to install only a subset of the files. By
default the script has no install tag which means it is not being run when `meson install --tags`
argument is specified.
skip_if_destdir bool, default: false, since 0.57.0
If `true` the script will not be run if DESTDIR is set during installation. This is useful in the
case the script updates system wide cache that is only needed when copying files into final
destination.
meson.add_postconf_script()
SYNOPSIS
void meson.add_postconf_script(script_name, arg...)
DESCRIPTION
Runs the given command after all project files have been generated. This script will have the
environment variables `MESON_SOURCE_ROOT` and `MESON_BUILD_ROOT` set.
POSARGS
script_name str | file | external_program, required
The script to execute.
(since 0.55.0) The output of find_program as well as strings are accepted.
(since 0.57.0) file objects and the output of configure_file may be used.
VARARGS
arg str | file | external_program, 0...N times, since 0.49.0
Additional arguments
(since 0.55.0) The output of configure_file, files, and find_program as well as strings are
accepted.
meson.backend()
SYNOPSIS
str meson.backend()
since 0.37.0
DESCRIPTION
Returns a string representing the current backend:
- `ninja`
- `vs2010`
- `vs2012`
- `vs2013`
- `vs2015`
- `vs2017`
- `vs2019`
- `vs2022`
- `xcode`
meson.build_options()
SYNOPSIS
str meson.build_options()
since 1.1.0
DESCRIPTION
Returns a string with the configuration line used to set the current project up.
NOTES
Do not try to parse this string!
You should use cfg_data.set_quoted to safely escape any embedded quotes prior to storing it into e.g.
a C header macro.
The contents returned by this function are the same as the "Build Options:" line reported in
`<builddir>/meson-logs/meson-log.txt`.
meson.build_root()
SYNOPSIS
str meson.build_root()
deprecated since 0.56.0
DESCRIPTION
Returns a string with the absolute path to the build root directory. This function will return the
build root of the parent project if called from a subproject, which is usually not what you want. Try
using meson.current_build_dir or meson.project_build_root. In the rare cases where the root of the
main project is needed, use meson.global_build_root that has the same behaviour but with a more
explicit name.
meson.can_run_host_binaries()
SYNOPSIS
bool meson.can_run_host_binaries()
since 0.55.0
DESCRIPTION
Returns true if the build machine can run binaries compiled for the host. This returns `true` unless
you are cross compiling, need a helper to run host binaries, and don't have one. For example when
cross compiling from Linux to Windows, one can use `wine` as the helper.
meson.current_build_dir()
SYNOPSIS
str meson.current_build_dir()
DESCRIPTION
Returns a string with the absolute path to the current build directory.
meson.current_source_dir()
SYNOPSIS
str meson.current_source_dir()
DESCRIPTION
Returns a string to the current source directory.
NOTES
You do not need to use this function!
When passing files from the current source directory to a function since that is the default. Also,
you can use the files function to refer to files in the current or any other source directory instead
of constructing paths manually with meson.current_source_dir.
meson.get_compiler()
SYNOPSIS
compiler meson.get_compiler(language, native: false)
DESCRIPTION
Returns a compiler object describing a compiler.
POSARGS
language str, required
The language of the compiler to return.
See our list of supported languages[35].
KWARGS
native bool, default: false
When set to `true` Meson returns the compiler for the build machine (the "native" compiler) and
when `false` it returns the host compiler (the "cross" compiler). If `native` is omitted, Meson
returns the "cross" compiler if we're currently cross-compiling and the "native" compiler if we're
not.
meson.get_cross_property()
SYNOPSIS
any meson.get_cross_property(propname, [fallback_value])
deprecated since 0.58.0
DESCRIPTION
Returns the given property from a cross file, the optional fallback_value is returned if not cross
compiling or the given property is not found.
This method is replaced by meson.get_external_property.
POSARGS
propname str, required
Name of the property in the cross / native file.
OPTARGS
fallback_value any
Value to return if `propname` is not set in the machine file.
meson.get_external_property()
SYNOPSIS
any meson.get_external_property(
propname,
[fallback_value],
native:,
)
since 0.54.0
DESCRIPTION
Returns the given property from a native or cross file. The optional fallback_value is returned if
the given property is not found.
POSARGS
propname str, required
Name of the property in the cross / native file.
OPTARGS
fallback_value any
Value to return if `propname` is not set in the machine file.
KWARGS
native bool
Setting `native` to `true` forces retrieving a variable from the native file, even when cross-
compiling. If `native: false` or not specified, the variable is retrieved from the cross-file if
cross-compiling, and from the native-file when not cross-compiling.
meson.global_build_root()
SYNOPSIS
str meson.global_build_root()
since 0.58.0
DESCRIPTION
Returns a string with the absolute path to the build root directory. This function will return the
build root of the main project if called from a subproject, which is usually not what you want. It
is usually preferable to use meson.current_build_dir or meson.project_build_root.
meson.global_source_root()
SYNOPSIS
str meson.global_source_root()
since 0.58.0
DESCRIPTION
Returns a string with the absolute path to the source root directory. This function will return the
source root of the main project if called from a subproject, which is usually not what you want. It
is usually preferable to use meson.current_source_dir or meson.project_source_root.
meson.has_exe_wrapper()
SYNOPSIS
bool meson.has_exe_wrapper()
deprecated since 0.55.0
DESCRIPTION
Use meson.can_run_host_binaries instead.
meson.has_external_property()
SYNOPSIS
bool meson.has_external_property(propname, native:)
since 0.58.0
DESCRIPTION
Checks whether the given property exist in a native or cross file.
POSARGS
propname str, required
Name of the property in the cross / native file.
KWARGS
native bool
Setting `native` to `true` forces retrieving a variable from the native file, even when cross-
compiling. If `native: false` or not specified, the variable is retrieved from the cross-file if
cross-compiling, and from the native-file when not cross-compiling.
meson.install_dependency_manifest()
SYNOPSIS
void meson.install_dependency_manifest(output_name)
DESCRIPTION
Installs a manifest file containing a list of all subprojects, their versions and license names to
the file name given as the argument.
If license files are defined as well, they will be copied next to the manifest and referenced in it.
If this function is not used, the builtin option `licensedir` can be used to install the manifest to
a given directory with the name `depmf.json`.
POSARGS
output_name str, required
Name of the manifest file to install
meson.is_cross_build()
SYNOPSIS
bool meson.is_cross_build()
DESCRIPTION
Returns `true` if the current build is a cross build[36] and `false` otherwise.
meson.is_subproject()
SYNOPSIS
bool meson.is_subproject()
DESCRIPTION
Returns `true` if the current project is being built as a subproject of some other project and
`false` otherwise.
meson.is_unity()
SYNOPSIS
bool meson.is_unity()
DESCRIPTION
Returns `true` when doing a unity build[37] (multiple sources are combined before compilation to
reduce build time) and `false` otherwise.
meson.override_dependency()
SYNOPSIS
void meson.override_dependency(
name,
dep_object,
native: false,
static:,
)
since 0.54.0
DESCRIPTION
Specifies that whenever dependency with `name` is used, Meson should not look it up on the system but
instead return `dep_object`, which may either be the result of dependency or declare_dependency.
Doing this in a subproject allows the parent project to retrieve the dependency without having to
know the dependency variable name: `dependency(name, fallback : subproject_name)`.
POSARGS
name str, required
The name of the dependency to override.
dep_object dep, required
The dependency to set as the override for `name`.
KWARGS
native bool, default: false
If set to `true`, the dependency is always overwritten for the build machine. Otherwise, the
dependency is overwritten for the host machine, which differs from the build machine when cross-
compiling.
static bool, since 0.60.0
Used to override static and/or shared dependencies separately. If not specified it is assumed
`dep_object` follows `default_library` option value.
meson.override_find_program()
SYNOPSIS
void meson.override_find_program(progname, program)
since 0.46.0
DESCRIPTION
specifies that whenever find_program is used to find a program named `progname`, Meson should not
look it up on the system but instead return `program`, which may either be the result of
find_program, configure_file or executable.
(since 0.55.0) If a version check is passed to find_program for a program that has been overridden
with an executable, the current project version is used.
POSARGS
progname str, required
The name of the program to override.
program exe | file | external_program, required
The program to set as the override for `progname`.
meson.project_build_root()
SYNOPSIS
str meson.project_build_root()
since 0.56.0
DESCRIPTION
Returns a string with the absolute path to the build root directory of the current (sub)project.
meson.project_license()
SYNOPSIS
list[str] meson.project_license()
since 0.45.0
DESCRIPTION
Returns the array of licenses specified in project function call.
meson.project_license_files()
SYNOPSIS
list[file] meson.project_license_files()
since 1.1.0
DESCRIPTION
Returns the array of license files specified in the project function call.
meson.project_name()
SYNOPSIS
str meson.project_name()
DESCRIPTION
Returns the project name specified in the project function call.
meson.project_source_root()
SYNOPSIS
str meson.project_source_root()
since 0.56.0
DESCRIPTION
Returns a string with the absolute path to the source root directory of the current (sub)project.
meson.project_version()
SYNOPSIS
str meson.project_version()
DESCRIPTION
Returns the version string specified in project function call.
meson.source_root()
SYNOPSIS
str meson.source_root()
deprecated since 0.56.0
DESCRIPTION
Returns a string with the absolute path to the source root directory.
This function will return the source root of the parent project if called from a subproject, which is
usually not what you want. Try using meson.current_source_dir or meson.project_source_root. In the
rare cases where the root of the main project is needed, use meson.global_source_root that has the
same behaviour but with a more explicit name.
NOTES
You should use the files function to refer to files in the root source directory instead of
constructing paths manually with meson.source_root.
meson.version()
SYNOPSIS
str meson.version()
DESCRIPTION
Return a string with the version of Meson.
module.found()
SYNOPSIS
bool module.found()
since 0.59.0
DESCRIPTION
Returns `true` if the module was successfully imported, otherwise `false`.
runresult.compiled()
SYNOPSIS
bool runresult.compiled()
DESCRIPTION
If `true`, the compilation succeeded, if `false` it did not and the other methods return unspecified
data. This is only available for `compiler.run()` results.
runresult.returncode()
SYNOPSIS
int runresult.returncode()
DESCRIPTION
The return code of executing the compiled binary
runresult.stderr()
SYNOPSIS
str runresult.stderr()
DESCRIPTION
The standard error produced when the command was run.
runresult.stdout()
SYNOPSIS
str runresult.stdout()
DESCRIPTION
The standard out produced when the command was run.
str.contains()
SYNOPSIS
bool str.contains(fragment)
DESCRIPTION
Returns `true` if string contains the string specified as the argument.
POSARGS
fragment str, required
The string fragment to check
EXAMPLE
target = 'x86_FreeBSD'
is_fbsd = target.to_lower().contains('freebsd')
# is_fbsd now has the boolean value 'true'
str.endswith()
SYNOPSIS
bool str.endswith(fragment)
DESCRIPTION
Returns true if string ends with the string specified as the argument.
POSARGS
fragment str, required
The string fragment to check
EXAMPLE
target = 'x86_FreeBSD'
is_bsd = target.to_lower().endswith('bsd') # boolean value 'true'
str.format()
SYNOPSIS
str str.format(fmt, value...)
DESCRIPTION
Strings can be built using the string formatting functionality.
See the Meson syntax entry[38] for more information.
Since 1.3.0 values other than strings, integers, bools, options, dictionaries and lists thereof are
deprecated. They were previously printing the internal representation of the raw Python object.
POSARGS
fmt str, required
The string to format.
The formatting works by replacing placeholders of type `@number@` with the corresponding varargs.
VARARGS
value int | bool | str, 0...N times
The values to replace the @number@ placeholders in the format string.
EXAMPLE
template = 'string: @0@, number: @1@, bool: @2@'
res = template.format('text', 1, true)
# res now has value 'string: text, number: 1, bool: true'
str.join()
SYNOPSIS
str str.join(strings...)
DESCRIPTION
The opposite of split, for example `'.'.join(['a', 'b', 'c']` yields `'a.b.c'`.
VARARGS
strings str, 0...N times, since 0.60.0
The strings to join with the current string.
Before Meson 0.60.0 this function only accepts a single positional argument of the type list[str].
EXAMPLE
# Similar to the Python str.join()
output = ' '.join(['foo', 'bar'])
# Output value is 'foo bar'
pathsep = ':'
path = pathsep.join(['/usr/bin', '/bin', '/usr/local/bin'])
# path now has the value '/usr/bin:/bin:/usr/local/bin'
str.replace()
SYNOPSIS
str str.replace(old, new)
since 0.58.0
DESCRIPTION
Search all occurrences of `old` and replace it with `new`
POSARGS
old str, required
The substring to search
new str, required
The replacement string
EXAMPLE
# Replaces all instances of one substring with another
s = 'semicolons;as;separators'
s = s.replace('as', 'are')
# 's' now has the value of 'semicolons;are;separators'
str.split()
SYNOPSIS
list[str] str.split([split_string])
DESCRIPTION
Splits the string at the specified character (or whitespace if not set) and returns the parts in an
array.
OPTARGS
split_string str
Specifies the character / substring where to split the string.
EXAMPLE
# Similar to the Python str.split()
components = 'a b c d '.split()
# components now has the value ['a', 'b', 'c', 'd']
components = 'a b c d '.split(' ')
# components now has the value ['a', 'b', '', '', 'c', 'd', '']
str.splitlines()
SYNOPSIS
list[str] str.splitlines()
since 1.2.0
DESCRIPTION
Splits the string into an array of lines. Unlike .split('0), the empty string produced an empt'
array0 are alltconsideredenewlines.newline, splitlines() doesn't split on that last newline. ´0, '
and '
EXAMPLE
output = 'hello0orld0.splitlines()
# Output value is ['hello', 'world']
output = ''.splitlines()
# Output value is []
fs = import('fs')
paths = fs.read('my_paths.list').splitlines()
# paths is now the paths listed in 'my_paths.list', or an empty list
# if 'my_paths.list' is empty
str.startswith()
SYNOPSIS
bool str.startswith(fragment)
DESCRIPTION
Returns true if string starts with the string specified as the argument.
POSARGS
fragment str, required
The string fragment to check
EXAMPLE
target = 'x86_FreeBSD'
is_x86 = target.startswith('x86') # boolean value 'true'
str.strip()
SYNOPSIS
str str.strip([strip_chars])
DESCRIPTION
Removes leading/ending characters from the string.
By default the characters to remove are spaces and newlines.
OPTARGS
strip_chars str, since 0.43.0
Instead of whitespace, strip all the characters in this string.
EXAMPLE
# Similar to the Python str.strip(). Removes leading/ending spaces and newlines
define = ' -Dsomedefine '
stripped_define = define.strip()
# 'stripped_define' now has the value '-Dsomedefine'
str.substring()
SYNOPSIS
str str.substring([start], [end])
since 0.56.0
DESCRIPTION
Returns a substring specified from `start` to `end`. Both `start` and `end` arguments are optional,
so, for example, `'foobar'.substring()` will return `'foobar'`.
The method accepts negative values where negative `start` is relative to the end of string
`len(string) - start` as well as negative `end`.
If `start` or `end` are out of bounds, the position of the closest character will be used. If
`start` is bigger than `end`, the result will be an empty substring.
OPTARGS
start int
The start position
end int
The end position
EXAMPLE
# Similar to the Python str[start:end] syntax
target = 'x86_FreeBSD'
platform = target.substring(0, 3) # prefix string value 'x86'
system = target.substring(4) # suffix string value 'FreeBSD'
Example with negative values:
string = 'foobar'
string.substring(-5, -3) # => 'oo'
string.substring(1, -1) # => 'ooba'
Example with out of bound values:
string = 'foobar'
string.substring(64) # => ''
string.substring(0, 64) # => 'foobar'
string.substring(64, 0) # => ''
str.to_int()
SYNOPSIS
int str.to_int()
DESCRIPTION
Converts the string to an int and throws an error if it can't be
EXAMPLE
version = '1'
# Converts the string to an int and throws an error if it can't be
ver_int = version.to_int()
str.to_lower()
SYNOPSIS
str str.to_lower()
DESCRIPTION
Converts all characters to lower case
EXAMPLE
target = 'x86_FreeBSD'
lower = target.to_lower() # t now has the value 'x86_freebsd'
str.to_upper()
SYNOPSIS
str str.to_upper()
DESCRIPTION
Converts all characters to upper case
EXAMPLE
target = 'x86_FreeBSD'
upper = target.to_upper() # t now has the value 'X86_FREEBSD'
str.underscorify()
SYNOPSIS
str str.underscorify()
DESCRIPTION
Creates a string where every non-alphabetical non-number character is replaced with `_`.
EXAMPLE
name = 'Meson Docs.txt#Reference-manual'
# Replaces all characters other than `a-zA-Z0-9` with `_` (underscore)
# Useful for substituting into #defines, filenames, etc.
underscored = name.underscorify()
# underscored now has the value 'Meson_Docs_txt_Reference_manual'
str.version_compare()
SYNOPSIS
bool str.version_compare(compare_string)
DESCRIPTION
Does semantic version comparison.
POSARGS
compare_string str, required
The string to compare to.
EXAMPLE
version = '1.2.3'
# Compare version numbers semantically
is_new = version.version_compare('>=2.0')
# is_new now has the boolean value false
# Supports the following operators: '>', '<', '>=', '<=', '!=', '==', '='
Meson version comparison conventions include:
´3.6'.version_compare('>=3.6.0') == false
It is best to be unambiguous and specify the full revision level to compare.
subproject.found()
SYNOPSIS
bool subproject.found()
since 0.48.0
DESCRIPTION
Returns whether the subproject was successfully setup.
subproject.get_variable()
SYNOPSIS
any subproject.get_variable(var_name, [fallback])
DESCRIPTION
fetches the specified variable from inside the subproject. This is useful to, for instance, get a
declare_dependency from the subproject[25].
If the variable does not exist, the variable `fallback` is returned. If a fallback is not specified,
then attempting to read a non-existing variable will cause a fatal error.
POSARGS
var_name str, required
The name of the variable to query
OPTARGS
fallback any
The fallback value to return if `var_name` does not exist.
OBJECTS
alias_tgt
extends: tgt
returned_by: alias_target
Opaque object returned by alias_target.
any
returned_by: get_variable, get, get, get_cross_property, get_external_property, get_variable
A placeholder representing all types. This includes builtin, as well as returned objects.
bool
returned_by: add_languages, get_option, is_disabler, is_variable, found, get, get_unquoted, has,
check_header, compiles, has_argument, has_define, has_function, has_function_attribute, has_header,
has_header_symbol, has_link_argument, has_member, has_members, has_multi_arguments,
has_multi_link_arguments, has_type, links, symbols_have_underscore_prefix, found, has_key, found,
found, allowed, auto, disabled, enabled, is_even, is_odd, contains, can_run_host_binaries,
has_exe_wrapper, has_external_property, is_cross_build, is_subproject, is_unity, found, compiled,
contains, endswith, startswith, version_compare, found
A boolean object which is either `true` or `false`
both_libs
since 0.46.0
extends: lib
returned_by: both_libraries
Container for both a static and shared library.
build_machine
extended_by: host_machine, target_machine
Provides information about the build machine -- the machine that is doing the actual compilation. See
Cross-compilation[35].
Currently, these values are populated using `platform.system()`[39] and `platform.machine()`[40]. If
you think the returned values for any of these are incorrect for your system or CPU, or if your OS is
not in the linked table, please file a bug[41] report with details and we'll look into it.
build_tgt
extends: tgt
returned_by: build_target, shared_module
extended_by: exe, jar, lib
A build target is either an executable, shared library, static library, both shared and static library
or shared module.
cfg_data
returned_by: configuration_data
This object encapsulates configuration values to be used for generating configuration files. A more in-
depth description can be found in the the configuration wiki page[9].
cmake
The CMake module
cmake_options
since 0.55.0
returned_by: subproject_options
Central configuration object for CMake subprojects
compiler
returned_by: get_compiler
This object is returned by meson.get_compiler. It represents a compiler for a given language and
allows you to query its properties.
NOTES
These compiler checks do not use compiler arguments added with `add_*_arguments()`, via
`-Dlang_args` on the command-line, or through `CFLAGS`/`LDFLAGS`, etc in the environment. Hence,
you can trust that the tests will be fully self-contained, and won't fail because of custom flags
added by other parts of the build file or by users. Note that if you have a single prefix with all
your dependencies, you might find it easier to append to the environment variables `C_INCLUDE_PATH`
with GCC/Clang and `INCLUDE` with MSVC to expand the default include path, and `LIBRARY_PATH` with
GCC/Clang and `LIB` with MSVC to expand the default library search path.
However, with GCC, these variables will be ignored when cross-compiling. In that case you need to
use a specs file. See: http://www.mingw.org/wiki/SpecsFileHOWTO
custom_idx
returned_by: [index]
References a specific output file of a custom_tgt object.
custom_tgt
extends: tgt
returned_by: custom_target, vcs_tag
This object is returned by custom_target and contains a target with the following methods:
dep
returned_by: declare_dependency, dependency, find_library, as_link_whole, as_system, partial_dependency
Abstract representation of a dependency
dict
since 0.47.0
Stores a mapping of strings to other objects. See dictionaries[42].
You can also iterate over dictionaries with the `foreach` statement[29].
(since 0.48.0): Dictionaries can be added (e.g. `d1 = d2 + d3` and `d1 += d2`). Values from the second
dictionary overrides values from the first. (since 0.62.0): Dictionary order is guaranteed to be
insertion order.
disabler
returned_by: disabler
A disabler object is an object that behaves in much the same way as NaN numbers do in floating point
math. That is when used in any statement (function call, logical op, etc) they will cause the statement
evaluation to immediately short circuit to return a disabler object. A disabler object has one method:
env
returned_by: environment
This object is returned by environment and stores detailed information about how environment variables
should be set. It should be passed as the `env` keyword argument to tests and other functions.
Since 0.58.0 env.append and env.prepend can be called multiple times on the same `varname`. Earlier
Meson versions would warn and only the last operation took effect.
EXAMPLE
env = environment()
# MY_PATH will be '0:1:2:3'
env.set('MY_PATH', '1')
env.append('MY_PATH', '2')
env.append('MY_PATH', '3')
env.prepend('MY_PATH', '0')
exe
extends: build_tgt
returned_by: executable, find_program
An executable
external_program
returned_by: find_program
Opaque object representing an external program
extracted_obj
returned_by: extract_all_objects, extract_objects
Opaque object representing extracted object files from build targets
feature
since 0.47.0
returned_by: get_option, disable_auto_if, disable_if, enable_auto_if, enable_if, require
Meson object representing a `feature` options[0]
file
returned_by: configure_file
Object that stores the path to an existing file
generated_list
returned_by: process
Opaque object representing the result of a generator.process call.
generator
returned_by: generator
This object is returned by generator and contains a generator that is used to transform files from one
type to another by an executable (e.g. `idl` files into source code and headers).
host_machine
extends: build_machine
Provides information about the host machine -- the machine on which the compiled binary will run. See
Cross-compilation[35].
It has the same methods as build_machine.
When not cross-compiling, all the methods return the same values as build_machine (because the build
machine is the host machine)
Note that while cross-compiling, it simply returns the values defined in the cross-info file.
inc
returned_by: include_directories, private_dir_include
Opaque wrapper for storing include directories
int
returned_by: get_option, to_int, get, get_unquoted, alignment, compute_int, sizeof, length, returncode,
to_int
All integer numbers. See Numbers[43] for more information.
jar
extends: build_tgt
returned_by: jar
A Java JAR build target
lib
extends: build_tgt
returned_by: library, shared_library, static_library, get_shared_lib, get_static_lib
extended_by: both_libs
Represents either a shared or static library
list
returned_by: files, get_option, keys, cmd_array, first_supported_argument,
first_supported_link_argument, get_supported_arguments, get_supported_function_attributes,
get_supported_link_arguments, preprocess, to_list, keys, project_license, project_license_files, split,
splitlines
An array of elements. See arrays[44].
meson
The `meson` object allows you to introspect various properties of the system. This object is always
mapped in the `meson` variable.
module
returned_by: import
Base type for all modules.
Modules provide their own specific implementation methods, but all modules provide the following
methods:
range
since 0.58.0
returned_by: range
Opaque object that can be used in a loop and accessed via `[num]`.
run_tgt
extends: tgt
returned_by: run_target
Opaque object returned by run_target.
runresult
returned_by: run_command, run
This object encapsulates the result of trying to compile and run a sample piece of code with
compiler.run or run_command.
str
returned_by: get_option, join_paths, to_string, cpu, cpu_family, endian, system, full_path, get_id,
name, outdir, path, get, get_unquoted, get_argument_syntax, get_define, get_id, get_linker_id, version,
full_path, full_path, get_configtool_variable, get_pkgconfig_variable, get_variable, include_type,
name, type_name, version, full_path, path, version, full_path, to_string, backend, build_options,
build_root, current_build_dir, current_source_dir, global_build_root, global_source_root,
project_build_root, project_name, project_source_root, project_version, source_root, version, stderr,
stdout, format, join, replace, strip, substring, to_lower, to_upper, underscorify
All strings[45] have the following methods. Strings are immutable, all operations return their results
as a new string.
structured_src
returned_by: structured_sources
Opaque object returned by structured_sources.
subproject
returned_by: subproject
This object is returned by subproject and is an opaque object representing it.
target_machine
extends: build_machine
Provides information about the target machine -- the machine on which the compiled binary's output will
run. Hence, this object should only be used while cross-compiling a compiler. See Cross-
compilation[35].
It has the same methods as build_machine.
When all compilation is 'native', all the methods return the same values as build_machine (because the
build machine is the host machine and the target machine).
Note that while cross-compiling, it simply returns the values defined in the cross-info file. If
`target_machine` values are not defined in the cross-info file, `host_machine` values are returned
instead.
tgt
extended_by: alias_tgt, build_tgt, custom_tgt, run_tgt
Opaque base object for all Meson targets
void
returned_by: add_global_arguments, add_global_link_arguments, add_project_arguments,
add_project_dependencies, add_project_link_arguments, add_test_setup, assert, benchmark, debug, error,
install_data, install_emptydir, install_headers, install_man, install_subdir, install_symlink, message,
project, set_variable, subdir, subdir_done, summary, test, unset_variable, warning, merge_from, set,
set10, set_quoted, add_cmake_defines, append, prepend, set, unset, add_devenv, add_dist_script,
add_install_script, add_postconf_script, install_dependency_manifest, override_dependency,
override_find_program
Indicates that the function does not return anything. Similar to `void` in C and C++
SEE ALSO
[1] Build-options.md#features
[2] Unit-tests.md
[3] https://www.testanything.org/
[4] https://ninja-build.org/manual.html#ref_dependencies
[5] https://ninja-build.org/manual.html#ref_headers
[6] https://dlang.org/spec/version.html#version
[7] https://gcc.gnu.org/wiki/Visibility
[8] Rust-module.md#proc_macro
[9] https://docs.microsoft.com/en-us/cpp/build/reference/subsystem-specify-subsystem
[10] Configuration.md
[11] https://docs.python.org/3/library/codecs.html#standard-encodings
[12] https://ninja-build.org/manual.html#_the_literal_console_literal_pool
[13] Dependencies.md#cmake
[14] Dependencies.md#dependencies-with-custom-lookup-functionality
[15] Wrap-dependency-system-manual.md#provide-section
[16] Dependencies.md#dependencies-with-custom-lookup-functionality
[17] Builtin-options.md#core-options
[18] Machine-files.md#binaries
[19] Build-options.md
[20] Builtin-options.md#universal-options
[21] Installing.md
[22] https://mesonbuild.com/Builtin-options.html
[23] https://spdx.dev/ids/
[24] https://spdx.org/licenses/
[25] External-commands.md
[26] Subprojects.md
[27] http://man7.org/linux/man-pages/man3/mallopt.3.html
[28] Reference-tables.md#cpu-families
[29] Reference-tables.md#operating-system-names
[30] Syntax.md#foreach-statements
[31] Reference-tables.md#compiler-ids
[32] Reference-tables.md#linker-ids
[33] Reference-tables.md#gcc-__attribute__
[34] Commands.md#devenv
[35] Reference-tables.md#language-arguments-parameter-names
[36] Cross-compilation.md
[37] Unity-builds.md
[38] Syntax.md#string-formatting
[39] https://docs.python.org/3.7/library/platform.html#platform.system
[40] https://docs.python.org/3.7/library/platform.html#platform.machine
[41] https://github.com/mesonbuild/meson/issues/new
[42] Syntax.md#dictionaries
[43] Syntax.md#numbers
[44] Syntax.md#arrays
[45] Syntax.md#strings
COPYRIGHT
Documentation comes from the meson project (https://mesonbuild.com) and is released under Attribution-
ShareAlike 4.0 International (CC BY-SA 4.0). Code samples are released under CC0 1.0 Universal (CC0 1.0).
Meson is a registered trademark of Jussi Pakkanen.
2024-11-28 meson-reference(3)