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A small utility to modify the dynamic linker and RPATH of ELF executables
C++ Shell Nix Other
Use location macros
PatchELF is a simple utility for modifing existing ELF executables and libraries. In particular, it can do the following: * Change the dynamic loader ("ELF interpreter") of executables: $ patchelf --set-interpreter /lib/my-ld-linux.so.2 my-program * Change the RPATH of executables and libraries: $ patchelf --set-rpath /opt/my-libs/lib:/other-libs my-program * Shrink the RPATH of executables and libraries: $ patchelf --shrink-rpath my-program This removes from the 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". * Remove declared dependencies on dynamic libraries (DT_NEEDED entries): $ patchelf --remove-needed libfoo.so.1 my-program This option can be given multiple times. * Add a declared dependency on a dynamic library (DT_NEEDED): $ patchelf --add-needed libfoo.so.1 my-program This option can be give multiple times. * Replace a declared dependency on a dynamic library with another one (DT_NEEDED): $ patchelf --replace-needed liboriginal.so.1 libreplacement.so.1 my-program This option can be give multiple times. AUTHOR Copyright 2004-2013 Eelco Dolstra <email@example.com>. LICENSE This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. HOMEPAGE http://nixos.org/patchelf.html BUGS The `strip' command from binutils generated broken executables when applied to the output of patchelf (if `--set-rpath' or `--set-interpreter' with a larger path than the original is used). This appears to be a bug in binutils (http://bugs.strategoxt.org/browse/NIXPKGS-85). RELEASE HISTORY 0.8 (January 15, 2014): * Fix a segfault caused by certain illegal entries in symbol tables. 0.7 (January 7, 2014): * Rewrite section indices in symbol tables. This for instance allows gdb to show proper backtraces. * Added `--remove-needed' option. 0.6 (November 7, 2011): * Hacky support for executables created by the Gold linker. * Support segments with an alignment of 0 (contributed by Zack Weinberg). * Added a manual page (contributed by Jeremy Sanders <firstname.lastname@example.org>). 0.5 (November 4, 2009): * Various bugfixes. * `--force-rpath' now deletes the DT_RUNPATH if it is present. 0.4 (June 4, 2008): * Support for growing the RPATH on dynamic libraries. * IA-64 support (not tested) and related 64-bit fixes. * FreeBSD support. * `--set-rpath', `--shrink-rpath' and `--print-rpath' now prefer DT_RUNPATH over DT_RPATH, which is obsolete. When updating, if both are present, both are updated. If only DT_RPATH is present, it is converted to DT_RUNPATH unless `--force-rpath' is specified. If neither is present, a DT_RUNPATH is added unless `--force-rpath' is specified, in which case a DT_RPATH is added. 0.3 (May 24, 2007): * Support for 64-bit ELF binaries (such as on x86_64-linux). * Support for big-endian ELF binaries (such as on powerpc-linux). * Various bugfixes. 0.2 (January 15, 2007): * Provides a hack to get certain programs (such as the Belastingaangifte 2005) to work. 0.1 (October 11, 2005): * Initial release.