NAME

       patchelf - Modify ELF files

SYNOPSIS

       patchelf OPTION FILE ...

DESCRIPTION

       PatchELF  is  a  simple  utility for modifying existing ELF executables and libraries.  It can change the
       dynamic loader ("ELF interpreter") of executables and change the RPATH of executables and libraries.

OPTIONS

       The single option given operates on each FILE, editing in place.

       Any option taking a string argument can also take a file by prefixing the argument with the @ symbol. See
       EXAMPLES

       --page-size SIZE
              Uses the given page size instead of the default.

       --set-interpreter INTERPRETER
              Change the dynamic loader ("ELF interpreter") of executable given to INTERPRETER.

       --print-interpreter
              Prints the ELF interpreter of the executable.

       --print-soname
              Prints DT_SONAME entry of .dynamic section.  Raises an error if DT_SONAME doesn't exist.

       --set-soname SONAME
              Sets DT_SONAME entry of a library to SONAME.

       --set-rpath RUNPATH
              Change the DT_RUNPATH of the executable or library to RUNPATH.

       --add-rpath RUNPATH
              Add RUNPATH to the existing DT_RUNPATH of the executable or library.

       --remove-rpath
              Removes the DT_RPATH or DT_RUNPATH entry of the executable or library.

       --shrink-rpath
              Remove from the DT_RUNPATH or DT_RPATH all directories that do not contain a library referenced by
              DT_NEEDED fields of the executable or library.

              For  instance,   if   an   executable   references   one   library   libfoo.so,   has   an   RPATH
              "/lib:/usr/lib:/foo/lib",  and libfoo.so can only be found in /foo/lib, then the new RPATH will be
              "/foo/lib".

       --allowed-rpath-prefixes PREFIXES
              Combined with the "--shrink-rpath" option,  this  can  be  used  for  further  rpath  tuning.  For
              instance,  if an executable has an RPATH "/tmp/build-foo/.libs:/foo/lib", it is probably desirable
              to keep the "/foo/lib" reference instead of the "/tmp" entry.

       --print-rpath
              Prints the DT_RUNPATH or DT_RPATH for an executable or library.

       --force-rpath
              Forces the use of the obsolete DT_RPATH in the file instead of DT_RUNPATH. By default DT_RPATH  is
              converted to DT_RUNPATH.

       --add-needed LIBRARY
              Adds  a  declared  dependency on a dynamic library (DT_NEEDED).  This option can be given multiple
              times.

       --replace-needed LIB_ORIG LIB_NEW
              Replaces a declared dependency on a dynamic library with another one (DT_NEEDED).  This option can
              be given multiple times.

       --remove-needed LIBRARY
              Removes a declared dependency on LIBRARY (DT_NEEDED entry). This  option  can  be  given  multiple
              times.

       --no-default-lib
              Marks  the  object  so  that  the  search  for dependencies of this object will ignore any default
              library search paths.

       --output FILE
              Set the output file name.  If not specified, the input will be modified in place.

       --debug
              Prints details of the changes made to the input file.

       --version
              Shows the version of patchelf.

EXAMPLES

       To use the contents on an external file as a parameter:

              $ patchelf a.out --add-rpath @/tmp/generated-rpath.bin

       To change the RPATH of a binary. Note that $ORIGIN is a special symbol used by the  loader,  so  must  be
       quoted.

              patchelf --set-rpath '$ORIGIN/../lib64' a.out

AUTHOR

       Eelco Dolstra <e.dolstra@tudelft.nl>

SEE ALSO

       elf(5), ld.so(8)

PATCHELF                                            JUNE 2010                                        PATCHELF(1)