https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65446
--- Comment #3 from Eric Blake <eblake at redhat dot com> --- see also bug 66249 where the implementation-defined signedness of enums comes into play, and where I argue that neither %d nor %u should warn when an enum type is passed through varargs where the range of the enum is identical through either format representation.
