https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96117
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Here is one where GCC works but clang does not: __attribute__((visibility("default"))) [[deprecated("a message")]] __attribute__((visibility("default"))) int A(void); If you remove the first __attribute__, clang will work.