https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55004 Bug 55004 depends on bug 69700, which changed state.
Bug 69700 Summary: [C++14] constexpr incorrectly implies const https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69700 What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |FIXED