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Tracking issue for release notes of #137037: add x86-sse2 (32bit) ABI that requires SSE2 target feature #137047

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Tracking issue for release notes of #137037: add x86-sse2 (32bit) ABI that requires SSE2 target feature#137047
Labels
A-ABIArea: Concerning the application binary interface (ABI)A-target-featureArea: Enabling/disabling target features like AVX, Neon, etc.A-targetsArea: Concerning the implications of different compiler targetsO-x86_32Target: x86 processors, 32 bit (like i686-*) (also known as IA-32, i386, i586, i686)T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.relnotesMarks issues that should be documented in the release notes of the next release.relnotes-tracking-issueMarks issues tracking what text to put in release notes.
Milestone
1.86.0

Description

@rustbot
rustbot
opened on Feb 14, 2025

This issue tracks the release notes text for #137037.

Steps

  • Proposed text is drafted by PR author (or team) making the noteworthy change.
  • Issue is nominated for release team review of clarity for wider audience.
  • Release team includes text in release notes/blog posts.

Release notes text

The responsible team for the underlying change should edit this section to replace the automatically generated link with a succinct description of what changed, drawing upon text proposed by the author (either in discussion or through direct editing).

# Compatibility Notes
- [SSE2 is now required for "i686" 32-bit x86 hard-float targets; disabling it causes a warning that will become a hard error eventually.](https://github.com/rust-lang/rust/pull/137037) Use an "i586" target to build code for machines without SSE2.

Tip

Use the previous releases categories to help choose which one(s) to use.
The category will be de-duplicated with all the other ones by the release team.

More than one section can be included if needed.

Release blog section

If the change is notable enough for inclusion in the blog post, the responsible team should add content to this section.
Otherwise leave it empty.



cc @RalfJung, @workingjubilee -- origin issue/PR authors and assignees for starting to draft text
Activity
  1. rustbot
    added 
    O-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)
     
    relnotesMarks issues that should be documented in the release notes of the next release.
     
    relnotes-tracking-issueMarks issues tracking what text to put in release notes.
     
    T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.
     
    needs-triageThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triaging
     on Feb 14, 2025
  2. workingjubilee commented on Feb 14, 2025 
    @workingjubilee
    workingjubilee
    on Feb 14, 2025
    Member
    I think this is a compatibility note, so edited it in. This is the big one with breaking changes of some nature, effectively: some x86 targets are required to have SSE2 now. Others don't require it and are expected to use a soft-float ABI where possible.
  3. RalfJung commented on Feb 14, 2025 
    @RalfJung
    RalfJung
    on Feb 14, 2025
    Member
    

    Others don't require it and are expected to use a soft-float ABI where possible.
    

    

    Hm, not sure if the "Rust" ABI is truly equivalent to the softfloat ABI. For "C" functions, it definitely is not -- i586 still uses a hardfloat ABI there.
    

    I would just say, use an i586 target if you need to build code that works on systems without SSE2. Those are tier 2 targets, which reflects that this configuration is not nearly as well-supported as the i686 targets with SSE2.
  4. rustbot
    added this to the  1.86.0 milestone on Feb 15, 2025
  5. jieyouxu
    added 
    A-ABIArea: Concerning the application binary interface (ABI)
     
    A-target-featureArea: Enabling/disabling target features like AVX, Neon, etc.
     
    A-targetsArea: Concerning the implications of different compiler targets
     
    O-x86_32Target: x86 processors, 32 bit (like i686-*) (also known as IA-32, i386, i586, i686)
     and removed 
    needs-triageThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triaging
     
    O-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)
     on Mar 22, 2025
  6. riking commented on Mar 26, 2025 
    @riking
    riking
    on Mar 26, 2025
    Agreed, the release note should explicitly mention "use a i586 target".
  7. BoxyUwU
    closed this as completedon Apr 21, 2025
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    A-ABIArea: Concerning the application binary interface (ABI)A-target-featureArea: Enabling/disabling target features like AVX, Neon, etc.A-targetsArea: Concerning the implications of different compiler targetsO-x86_32Target: x86 processors, 32 bit (like i686-*) (also known as IA-32, i386, i586, i686)T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.relnotesMarks issues that should be documented in the release notes of the next release.relnotes-tracking-issueMarks issues tracking what text to put in release notes.
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