https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70367
--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to David Binderman from comment #0) > With recent gcc trunk on x86_64, I get > > $ ~/gcc/results/bin/gcc -c -O3 -march=native gcc.target/i386/pr70300.c You have to report real -march argument that is passed to cc1. Please use -### and grep for "-march" and "-mtune" in the returned text.