ld.so library search paths

最新推荐文章于 2024-05-30 17:52:21 发布

henpat

最新推荐文章于 2024-05-30 17:52:21 发布

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本文深入探讨了程序运行时动态库的搜索路径，包括使用DT_RPATH、环境变量LD_LIBRARY_PATH、编译时缓存文件ld.so.cache等方法。详细解释了每个方法的原理和使用场景，对于理解程序加载过程和优化资源利用具有重要意义。

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The shared libraries needed by the program are searched for in
various places:

       o      (ELF only) Using the DT_RPATH dynamic section attribute
              of the binary if present and DT_RUNPATH attribute does
              not exist. Use of DT_RPATH is deprecated. (-Wl, -rpath,$DIR)

       o      Using the environment variable LD_LIBRARY_PATH.   Except
              if the executable is a set-user-ID/set-group-ID binary,
              in which case it is ignored.

o (ELF only) Using the DT_RUNPATH dynamic section
attribute of the binary if present. (-Wl, -rpath, $DIR, --enable-new-dtags)

       o      From the cache file /etc/ld.so.cache which contains a
              compiled list of candidate libraries previously found in
              the augmented library path. If, however, the binary was
              linked with -z nodeflib linker option, libraries in the
              default library paths are skipped.

Reference http://blog.lxgcc.net/?tag=dt_rpath