https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67963
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> --- (In reply to H.J. Lu from comment #0) > We should issue an error if -march=lakemont is used without -miacmu. We should issue an error if -march=lakemont is used without -mno-80387, not without -miamcu.