https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69698 Bug 69698 depends on bug 71147, which changed state.
Bug 71147 Summary: [6 Regression] Flexible array member wrongly rejected in template https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71147 What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED