Fix symbol resolution misbehaior for GCC and Clang on MacOS #158
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Summary
Similar to what we have fixed in PR #144 but seems like GCC and Clang disagrees in how to behave for
-flat_namepsace
on MacOS. So I only need to set this flag on GCC but not in Clang, because if I set this in Clang, the the loader loads the symbol from the first loaded library (exactly the same as if I don't set this flag in GCC)... :(Details and comments