Re: [PATCH 2/2] kbuild: rust: keep Rust objects out of Clang LTO with inline helpers

On Mon, Aug 17, 2026 at 8:12 PM Nathan Chancellor <[email protected]> wrote:
>
> I am not sure we can use '-mllvm -trap-unreachable' for C code, as that
> would mess with manually inserted calls to __builtin_unreachable(). It
> has come up before:
>
>   https://lore.kernel.org/CAHk-=wgPCbZv0JgqoNWMOO+p=N772YW16xYk_pmb1GU7aeuPFA@mail.gmail.com/
>
> It is possible the '-no-trap-after-noreturn' avoids that particular
> issue but I still think the "compiler inserted" vs. "user inserted"
> distinction that Linus comments on is likely still potentially relevant.

Thanks Nathan -- yeah, that is the kind of "intended" thing I was
wondering about in my note above... It would be nice if there could be
a distinction between the developer-provided ones and the ones that
get inserted for other reasons.

Ok, I picked these up to fix the immediate issue, since they only
affect the experimental mode and only the Rust side. If there is a
better approach available in the future, then great.

Cheers,
Miguel