https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55004 Bug 55004 depends on bug 118239, which changed state.
Bug 118239 Summary: [12/13/14/15 Regression] accepts invalid constexpr variable definition https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118239 What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED