https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58601 Bug 58601 depends on bug 92045, which changed state.
Bug 92045 Summary: [7/8/9/10 regression][C++11] valid alignas ignored with spurious warning https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92045 What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |DUPLICATE