scanon added a comment. Wearing my compiler user hat, I would much rather use additive -mfeature than have to specify these as -march+feature, even when using a build system that nominally handles this stuff, because I frequently want to be able to compile one specific file with "whatever the prevailing options are, but also enable this one feature." Most build systems make this possible somehow (track down the arch variable, append +feature to it, etc), but it's considerably simpler if you can just append -mfeature to the list of flags and call it a day.
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