Re: [PATCH] rust: x86: support Rust >= 1.98.0 target spec

[Miguel Ojeda]

On Sat, May 30, 2026 at 1:49 PM Miguel Ojeda <ojeda@xxxxxxxxxx> wrote:
>
> Starting with Rust 1.98.0 (expected 2026-08-20), the target spec will not
> support `x86-softfloat` anymore [1]. Instead, `softfloat` should be used,
> which is an alias. Otherwise, one gets:
>
>     error: error loading target specification: rustc-abi: invalid rustc abi: 'x86-softfloat'. allowed values: 'x86-sse2', 'softfloat' at line 3 column 32
>       |
>       = help: run `rustc --print target-list` for a list of built-in targets
>
> Thus conditionally use one or the other depending on the version.
>
> The alias has existed since Rust 1.95.0 (released 2026-04-16) [2], but
> use the newer version instead to avoid changing how the build works for
> existing compilers, at least until more testing takes place.
>
> Cc: Ralf Jung <post@xxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # Needed in 6.12.y and later (Rust is pinned in older LTSs).
> Link: https://github.com/rust-lang/rust/pull/157151 [1]
> Link: https://github.com/rust-lang/rust/pull/151154 [2]
> Signed-off-by: Miguel Ojeda <ojeda@xxxxxxxxxx>

Applied to `rust-fixes` early so that we start getting testing
tomorrow -- thanks everyone!

Tags still welcome for a day or so.

(I considered `rust-next`, but to simplify testing for ~2 weeks for
those that want to use nightly, I decided to put it in `rust-fixes`
instead.)

Cheers,
Miguel