https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80108
--- Comment #8 from Segher Boessenkool <segher at gcc dot gnu.org> --- Hi Kelvin, 405 does not have VSX (or even VMX). The instructions enabled by -mpower9-minmax require VSX. The following behaviours all make sense, for -mcpu=405 -mpower9-minmax: 1) Ignore the latter option; 2) Give a warning; 3) Give an error. The following do not make sense: 1) Enable VSX; 2) Select -mcpu=power9 instead; 3) Omelette du fromage.
