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The flac configury marked clang as 'not being gcc' and excluded a lot of compiler switches, most importantly the visibility flags, from being used with it. This was done possibly after a problem reported at: https://github.com/erikd/libsndfile/issues/49 . This patch does the following: - m4/gcc_version.m4 (XIPH_GCC_VERSION): set GCC_MAJOR_VERSION and GCC_MINOR_VERSION to 0 for non-gcc. Previously, they were left unset. - configure: the gcc version checks are, naturally, against non- zero values, so, allow many compiler switches to be used with clang without affecting real-gcc cases. - configure: When setting CFLAGS="-O3 -funroll-loops", also set CXXFLAGS="-O3". Prevents g++ warnings with _FORTIFY_SOURCE, i.e.: '_FORTIFY_SOURCE requires compiling with optimization (-O)' Tested compilation using gcc-7.3.1 and clang-5.0.2 on x86_64-linux, and gcc-4.4.7 and clang-3.4.2 on an i686-linux. Also tested cross- compiling for Mac OS X using clang-5.0.2.