I just tried an experiment on our code base, adding -flto to the default values of CMAKE_C_FLAGS_RELEASE and CMAKE_CXX_FLAGS_RELEASE, and setting CMAKE_AR to /usr/bin/gcc-ar-5, CMAKE_RANLIB to /usr/bin/gcc-ranlib-5. However, make VERBOSE=1 shows that the intermediate static libraries are still being created using /usr/bin/ar; and I can't find any other instances of /usr/bin/ar in CMakeCache.txt. That results in lots of BFD warnings showing up, and linker errors at the end.
Is there something I'm missing that would make this able to work; or is this configuration not supported (yet)? -- Daniel Schepler
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