[CMake] Adding -fPIC to static libraries

[Filipe Sousa]

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For some reason that I don't understand I have to add -fPIC to static
libraries on AMD64 otherwise I get this message:
relocation R_X86_64_32 against `a local symbol' recompile with -fPIC

If I add -fPIC to CMAKE_C/CXX_FLAGS in the top level CMakeLists works
but for shared libraries -fPIC is added twice.

I see that there is a CMAKE_SHARED_LIBRARY_C_FLAGS variable with
"-fPIC", is there any CMAKE_STATIC_LIBRARY_C_FLAGS so that I can add
"-fPIC"?


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Filipe Sousa
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