https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83743
--- Comment #3 from Peter Bergner <bergner at gcc dot gnu.org> --- (In reply to Segher Boessenkool from comment #2) > The driver asks the kernel, and the kernel knows. It's just a string. Correct, the kernel passes a string to the driver and the driver blindly uses it as its -mcpu= option, without first determining whether it recognizes (ie, supports it) or not.