https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55004 Bug 55004 depends on bug 117963, which changed state.
Bug 117963 Summary: Invalid enum values accepted in constexpr with -fstrict-enums https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117963 What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |DUPLICATE