https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109982
--- Comment #15 from Alexander Monakov <amonakov at gcc dot gnu.org> --- For '--float' I think runtime differences are expected when you pass -m flags that enable FMA, unless you also pass '-ffp-contract=off'. For '--compiler-attributes' I'd suggest reporting only compiler ICEs (except if you have some confidence the generated source is valid).