https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86306
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- It's correctly rejected by GCC because _Atomic is a C keyword, not a C++ one. Please try to understand the code before filing bugs, and consider if it's really a bug.