[Bug c/53769] [C11]: Macros __STDC_NO_THREADS__ / __STDC_NO_ATOMIC__ missing.

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769

--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Sergey Fedorov from comment #13)
> Apparently `__STDC_NO_THREADS__` is still not being defined?

Because you're on macOS.

This was fixed for GNU/Linux by defining it in glibc's std-predef.h but you're
not using glibc.