https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63287
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- See Also| |https://bugs.llvm.org/show_ | |bug.cgi?id=33230 --- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> --- FWIW libc++ does it in the library: #if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(__STDCPP_THREADS__) #define __STDCPP_THREADS__ 1 #endif