[Bug 272900] Mk/Uses/cpufeatures.mk - Framework helper for detecting CPU features/instructions

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272900

--- Comment #9 from Daniel Engberg <diizzy@FreeBSD.org> ---
(In reply to Piotr Kubaj from comment #8)
I think you misunderstand or I wasn't clear about it, I don't want to use
-native specifically. 

"and -march=native would follow CPUTYPE" --> -march=${CPUTYPE}

Not sure if we should use a list like we're doing right now or generate
variables using a documented "protected" naming schema.

Like HAVE_CPU_FEAT_${TARGET_FEATURE} or HAVE_CPU_INSTR_${TARGET_FEATURE} where
it would be extracted from compiler output. 
Example: .... -target-feature +mmx -target-feature +avx2 ...
HAVE_CPU_FEAT_MMX , HAVE_CPU_FEAT_AVX2

Best regards,
Daniel

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