[Rpm-maint] [rpm-software-management/rpm] RFC: Add x86-64 architecture levels (v2-v4) as architectures (PR #2315)

[Fabian Vogt]

> > For backward-compatibility and to avoid surprises, default to building x86_64 even on v2+ capable machines.
> > Tested by running rpm --eval %_target_cpu and using rpmbuild with various BuildArch values on a x86_64_v3 host.
> 
> Looks like my fix for the platform macros generation broke that part a bit. While with `BuildArch: x86_64_v3` it spits out an `x86_64_v3` RPM, it uses the `x86_64` optflags still. The only way to end up with `x86_64_vX` optflags is by using `--target x86_64_vX`. What's the best way to end up with better semantics?

The reason for that is that `BuildArch` only sets `%_target_cpu`, but not anything else like `%_target` or `%optflags`:

https://github.com/rpm-software-management/rpm/blob/e2c504c08381519c81774791fe6b82eb064a072e/build/parseSpec.c#L1012-L1025

IMO this can be treated as a separate bug (or is this intentional?). Opinions?

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