CPU architecture selection in blis project

[lamikr]

In BLIS project the cpu architecture is now configured to ZEN2. (Configure option before build)
Should the BLIS build script check the CPU architecture really in use and change that option?

[jeroen-mostert]

Of note is that if you have a Zen 4 CPU, you're out of luck, as BLIS has no support yet, only the AMD fork (AOCL-BLAS) does (flame/blis#770). Depending on what uses BLIS, we may also just get away with compiling it generically, as performance should still be decent. This also aids cross-platform/cloud builds, but we would need a bit more work regardless for those -- right now lots of things still assume we're compiling/optimizing for the build system, and while nothing should outright break, it seems likely performance is not necessarily going to be optimal.