https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102790
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Known to fail|10.1.0 | --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- GCC 10 is correct based on the C and C++ standards. There are other bugs filed about this exact thing but not based on extended identifiers.