On 05/28/2014 12:17 PM, Nils Gladitz wrote: > In case you drop "-Wl,-soname" entirely ... how do you work around the > issue of the linker using paths rather than names in NEEDED entries? > Or does the issue not exist on OpenBSD?
This is an important issue. CMake generates link command lines that refer to library files by path rather than asking the linker to search with a -lfoo option. This approach ensures the expected library file is linked. If the library file has no DT_SONAME then some linkers put the path in DT_NEEDED. For example, compare three commands for linking to a /path/to/libfoo.so file that has no DT_SONAME: ==================================== ============================== Command Line Result ==================================== ============================== cc A.c -o A -L/path/to -lfoo DT_NEEDED = libfoo.so cc B.c -o B /path/to/libfoo.so DT_NEEDED = /path/to/libfoo.so cd /path && cc C.c -o C to/libfoo.so DT_NEEDED = to/libfoo.so ==================================== ============================== Therefore linking by path to a library requires that the library have a DT_SONAME, or that the linker be modified to do something else for DT_NEEDED. -Brad -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/cgi-bin/mailman/listinfo/cmake-developers
