https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55004 Bug 55004 depends on bug 58541, which changed state.
Bug 58541 Summary: [c++11] Bogus "error: redeclaration ... differs in ‘constexpr’" https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58541 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED