> GCC's __builtin_cpu_supports does unfortunately not support all features
> needed to detect these levels properly.
Looks like since GCC 12.2 it actually can do
`__builtin_cpu_supports("x86-64-v3")`:
https://github.com/gcc-mirror/gcc/commit/8ea292591e42aa4d52b4b7a00b86335bfd2e2e85#diff-64afd6a149a7486d332f3d75ac9479f58d0fb674be6920a6e7db0e54cd205e70R38
It's just not documented... Is that an option for RPM? I guess not. It's not
implemented by clang.
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