> It's just not documented... Is that an option for RPM? I guess not. It's not 
> implemented by clang.

It's documented here: 
https://gcc.gnu.org/onlinedocs/gcc/x86-Built-in-Functions.html#index-_005f_005fbuiltin_005fcpu_005fsupports-1
 (though we wrongly documented that under `__builtin_cpu_is` for GCC 12.x).

Well, that's a pity that clang does not support that. It would make the 
implementation much simpler!

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