Re: [PATCH] rust: Kbuild: set frame-pointer llvm module flag for CONFIG_FRAME_POINTER

On Tue, Jun 16, 2026 at 3:34 PM Miguel Ojeda
<[email protected]> wrote:
>
> On Tue, Jun 16, 2026 at 2:30 PM Alice Ryhl <[email protected]> wrote:
> >
> > Cc: [email protected]
> > Fixes: 2f7ab1267dc9 ("Kbuild: add Rust support")
>
> For 6.1.y, we use Rust 1.62.0, so we don't have `-Zllvm_module_flag`,
> so we cannot go that far back. I guess we will need to accept the
> issue there.
>
> For 6.6.y, we use Rust 1.73.0, so we don't have it either.
>
> For 6.12.y onward, we support Rust 1.78.0, so it is fine --
> `-Zllvm_module_flag` got added in Rust 1.76.0.
>
> In both 6.1.y and 6.6.y, we also don't have `rustc-min-version`,
> because the version is pinned there. That part happens to work,
> though, just due to how lax Make is... However, if the flag had been
> available, then we should probably still do it cleanly with a custom
> patch to avoid confusion.
>
> So I will instead do:
>
> Cc: [email protected] # 6.12.y and later (flag not available in
> pinned Rust in older LTSs).

Ah, I didn't know it was so new. That makes sense, thanks.

Alice