[Rpm-maint] [rpm-software-management/rpm] Use __builtin_cpu_supports in x86-64 CPU feature level detection (PR #2508)

[Fabian Vogt]

> I meant more like only use it if detected available.

FWICT it's supported by GCC 7.1 (haven't checked older) and in clang since 2015. Are other compilers supported?

> And if this whole thing relies on it, then perhaps we should only detect these newer variants if __builtin_cpu_supports() is available.

Yes. Though it's IMO weird that in under those circumstances RPM would then just ignore some architectures.

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