[Buildroot] Xeon variant for x86_64 target

[Atilla Filiz]

Hello

I am preparing a config for an Intel Xeon D based target. There is no Xeon
variant available in the 2021.02 release. I am not very familiar with the
x86 family but I want to create a pro[er variant if possible.

I see the build variant selects certain flags. E.g. Atom selects
BR2_X86_CPU_HAS_MMX [=y] && BR2_X86_CPU_HAS_SSE [=y] &&
BR2_X86_CPU_HAS_SSE2 [=y] && BR2_X86_CPU_HAS_SSE3 [=y] &&
BR2_X86_CPU_HAS_SSSE3 [=y]

What else does this variant selection affect? I assume a few additional
build flags to pass on GCC? Maybe some kernel build options?

How does one go about creating a proper x86_64 variant?

-- 
Atilla Filiz
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