MaskRay added a comment. Is this an upstream GCC behavior or a behavior from some gcc-none-eabi distributions? GCC's C++ mode defines `_GNU_SOURCE` historically due to a libstdc++ limitation https://gcc.gnu.org/onlinedocs/libstdc++/faq.html#faq.predefined and nowadays "the ship has sailed" and many targets do the same for compatibility. For C, most targets don't force defining `_GNU_SOURCE`.
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