https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114007
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Anyway, #ifdef __has_c_attribute #if __has_c_attribute (clang::unsafe_buffer_usage) int i; #endif #endif #ifdef __has_cpp_attribute #if __has_cpp_attribute (clang::unsafe_buffer_usage) int j; #endif #endif fails to preprocess with GCC from 5.1 till trunk with -std=c11 and fails with clang 6 - 16 as well, just clang 17+ accepts it (and obviously the old versions of the compiler don't predefine those macros). So, if they care about portability, they should fix it.
