https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58601 Bug 58601 depends on bug 69571, which changed state.
Bug 69571 Summary: [C++11] invalid alignas on a typedef accepted, reduces alignment https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69571 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |DUPLICATE