https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115657
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Known to fail| |12.1.0, 13.1.0, 14.1.0, | |15.0 Keywords| |ice-checking Summary|[15 regression] ICE in |ICE in |tsubst_enum/tsubst_expr |tsubst_enum/tsubst_expr |during template |during template |instantiation |instantiation --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- /* We shouldn't get here, but keep going if !flag_checking. */ if (flag_checking) gcc_unreachable (); And yes it ICEs with -fchecking starting with GCC 12. I have not checked if this changed to the above check in GCC 12 though.