https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89864
--- Comment #48 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Perhaps that redefinition of _Atomic should be guarded with #if (__STDC_VERSION__ < 201112L) || defined(__cplusplus) or so, so that for C -std=c11 you still get _Atomic?
