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fix: drop redundant _GNU_SOURCE defines - #67
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g++ and clang++ predefine _GNU_SOURCE for every C++ translation unit on Linux, so the explicit defines only produced redefinition warnings. None of the four files use a GNU-only symbol, and the macro is meaningless on the macOS and mingw targets.
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g++ and clang++ predefine _GNU_SOURCE for every C++ translation unit on Linux, so the explicit defines only produced redefinition warnings. None of the four files use a GNU-only symbol, and the macro is meaningless on the macOS and mingw targets.