https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53037
--- Comment #28 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #27 from H.J. Lu <hjl.tools at gmail dot com> ---
> What are error messages?
None, the warnings are simply missing.
Rainer