Re: [PATCH] x86/build/64: Prevent native builds from generating APX instructions

On Fri, Jul 31, 2026 at 10:46=E2=80=AFPM Chang S. Bae <chang.seok.bae@intel=
.com> wrote:
>
> Given that one option would be relax the rustc version while tightening
> the backend like:
>
>   Option 1: RUSTC_VERSION >=3D 108800 && RUSTC_LLVM_MAJOR_VERSION >=3D 23
>
> Or, simply like the previous:
>
>   Option2: RUSTC_VERSION >=3D 109301
>
> Since the rustc front does no longer emits the `apxf` attribute starting
> from 1.93. Also, 1.93 requires at least LLVM 21 which already supports AP=
X.

Does it mean it could be the "OR" of those two?

i.e. it sounds like we could avoid having to pick one or the other.

Thanks for double-checking that and doing the analysis, I appreciate
it! Figuring out the precise version gates for this sort of thing is
always informative on its own.

Cheers,
Miguel