How to link a test with a library as obtained in the build directory, not with the installed version, which may be outdated?
Disclosure: cross-posted from https://stackoverflow.com/questions/56328326. == Use case == Suppose cmake; make; ctest; make install works fine: - generates libA, - runs testB, - installs libA to ${CMAKE_INSTALL_LIBDIR}. Now I modify libA, and rerun make; ctest. No reaction to my modifications: ldd testB shows that the installed version of libA is used. Which is plain nonsense for a test. The test should always use the local version of libA, never the installed one. == Towards a solution == I saw a lot of advise that involves RPATH, but found no variant that helps. So I hard-coded the path by changing target_link_libraries(testB PRIVATE A) into target_link_libraries(testB PRIVATE ${CMAKE_BINARY_DIR}/lib/libA.so). This works, but is no longer platform independent. How to solve my problem in a way that also works under Windows? - Joachim
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