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Tracking issue for release notes of #145682: Promote aarch64-pc-windows-msvc to Tier 1 #146189

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Tracking issue for release notes of #145682: Promote aarch64-pc-windows-msvc to Tier 1#146189
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O-aarch64-pc-windows-msvcTarget: aarch64-pc-windows-msvcT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.release-blog-postMarks issues tracking what text to put in the release blog post.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
1.91.0

Description

@rustbot
rustbot
opened on Sep 4, 2025

This issue tracks the release notes text for #145682.

cc @dpaoliello, @jieyouxu -- original issue/PR authors and assignees for drafting text

See the forge.rust-lang.org chapter about release notes for an overview of how the release team makes use of these tracking issues.

Release notes text

This section should be edited to specify the correct category(s) for the change, with succinct description(s) of what changed. Some things worth considering:

  • Does this need an additional compat notes section?
  • Was this a libs stabilization that should have additional headers to list new APIs under Stabilized APIs and Const Stabilized APIs?
# Platform Support
- [Promote `aarch64-pc-windows-msvc` to Tier 1](https://github.com/rust-lang/rust/pull/145682)

Tip

Use the previous releases for inspiration on how to write the release notes text and which categories to pick.

Release blog section

If this change is notable enough for inclusion in the blog post then this section should be edited to contain a draft for the blog post. Otherwise leave it empty.



Note


If a blog post section is required the release-blog-post label should be added (@rustbot label +release-blog-post) to this issue as otherwise it may be missed by the release team.


Activity
  1. Imagerustbot
    added 
    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.
     
    T-bootstrapRelevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)
     
    relnotes-tracking-issueMarks issues tracking what text to put in release notes.
     
    O-aarch64-pc-windows-msvcTarget: aarch64-pc-windows-msvc
     
    needs-triageThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triaging
     on Sep 4, 2025
  2. Imagejieyouxu
    removed 
    T-bootstrapRelevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)
     
    needs-triageThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triaging
     on Sep 4, 2025
  3. Imagerustbot
    added this to the  1.91.0 milestone on Sep 4, 2025
  4. dpaoliello commented on Sep 5, 2025 
    @dpaoliello
    dpaoliello
    on Sep 5, 2025
    Contributor
    I assume we want something like the Arm64 macOS announcement:
    

    

    Windows on 64-bit ARM is now Tier 1
    

    The Rust target aarch64-pc-windows-msvc for Windows on 64-bit ARM is now a tier 1 target, indicating our highest guarantee of working properly. As the platform support page describes, every change in the Rust repository must pass full tests on every tier 1 target before it can be merged. This target was introduced as tier 3 back in Rust 1.30 and promoted to tier 2 in Rust 1.49, making it available via rustup. This new milestone puts the aarch64-pc-windows-msvc target on par with the 64-bit ARM Linux and macOS, and the X86 Linux and Windows targets.
    

  5. Imagejieyouxu
    added 
    release-blog-postMarks issues tracking what text to put in the release blog post.
     on Sep 25, 2025
  6. ImageMark-Simulacrum
    closed this as completedon Oct 23, 2025
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