https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89232
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> --- The standard C++ headers are listed at: https://en.cppreference.com/w/cpp/header It does have an "Unsupported C headers" section: https://en.cppreference.com/w/cpp/header#Unsupported_C_headers "The C headers <stdatomic.h>, <stdnoreturn.h>, and <threads.h> are not included in C++ and have no cxxx equivalents."
