https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55004 Bug 55004 depends on bug 119866, which changed state.
Bug 119866 Summary: constexpr with __builtin_strlen does not always work https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119866 What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |DUPLICATE