https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64534
--- Comment #6 from Phong Nguyen <p.nguyen at yahooinc dot com> --- Ah, sorry, I was directed here to take a look at: `gcc -march=native -march=westmere` I observed that on GCC 8 the usual expectation of "last flag wins" was not true, but that it appears to do the right thing on GCC9+.
