https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115990
--- Comment #16 from gnzlbg <gonzalo.gadeschi at gmail dot com> --- Maybe if it was called "-Ounsafe-fast" people may end up reading the docs to find out what that unsafe means. If we had that option as an alias to "-Ofast", then maybe -Ofast could just warn with: > -Ofast is deprecated, use -Ounsafe-fast instead. If you don't know why -Ofast > is unsafe, please do read the documentation here: > https://gcc.gnu.org/wiki/FloatingPointMath That would introduce quite a bit of churn into the SW ecosystem in general, but at least that warning would be actionable, educational, and anyone getting burned by -Ounsafe-fast could no longer blame anyone else but themselves.