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iOS,macOS,android: macOS host build broken with Xcode 27 release candidate 1 #192609

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iOS,macOS,android: macOS host build broken with Xcode 27 release candidate 1#192609
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cbracken
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P0Critical issues such as a build break or regressionfyi-androidFor the attention of Android platform teamfyi-macosFor the attention of macOS platform teamplatform-iosiOS applications specificallyplatform-macosBuilding on or for macOS specificallyteam-iosOwned by iOS platform team

Description

@cbracken
cbracken
opened on Sep 11, 2026

macOS host build linking fails with the following error on Xcode 27 release candidate 1:

ld64.lld: error: could not load TAPI file at ../../flutter/prebuilts/SDKs/MacOSX27.0.sdk/usr/lib/libSystem.tbd: malformed file
./engine/src/flutter/prebuilts/SDKs/MacOSX27.0.sdk/usr/lib/libSystem.tbd:4:20: error: unknown architecture
                   arm64e.x1-macos, arm64e.x1-maccatalyst ]
                   ^~~~~~~~~~~~~~~

Upstream fix in llvm: llvm/llvm-project#222721

This has landed in Fuchsia https://llvm.googlesource.com/llvm-project/+/b8007a8e4020b8bca2b12e94 but it looks like the last built toolchain was 9d4a7d05d2ef4774f08a0f95faef510c0be469a9 about 5 hours ago around 07:18 JST:

Package:       fuchsia/third_party/clang/mac-arm64
[... snip snip snip ...]
Registered at: 2026-09-11 07:18:02.807744 +0900 JST
Refs:
  latest
Tags:
  git_revision:9d4a7d05d2ef4774f08a0f95faef510c0be469a9
Metadata:
  build_id:8671018563373205553
  git_repository:https://llvm.googlesource.com/llvm-project
  version:24.0.0git

Activity

  1. cbracken
    self-assigned this
    on Sep 11, 2026
  2. cbracken
    added
    platform-iosiOS applications specifically
    platform-macosBuilding on or for macOS specifically
    P0Critical issues such as a build break or regression
    fyi-androidFor the attention of Android platform team
    team-iosOwned by iOS platform team
    fyi-macosFor the attention of macOS platform team
    on Sep 11, 2026
  3. cbracken
    added 2 commits that reference this issue on Sep 11, 2026

    Fix fuchsia unused field/variable compile error

    df03dae

    Fix fuchsia unused field/variable compile error

    d1362eb

  4. cbracken commented on Sep 11, 2026

    @cbracken
    cbracken
    on Sep 11, 2026
    MemberAuthor

    A new fuchsia toolchain is ready that contains the fix:

    Package:       fuchsia/third_party/clang/mac-arm64
[... snip snip snip ...]
Registered at: 2026-09-11 14:43:05.01117 +0900 JST
Refs:
  latest
Tags:
  git_revision:07d67299a15ce03b053736e2d31a668ee0576987
Metadata:
  build_id:8670990278542735345
  git_repository:https://llvm.googlesource.com/llvm-project
  version:24.0.0git
  5. cbracken
    added 3 commits that reference this issue on Sep 11, 2026

    Roll clang to 07d67299a15ce03b053736e2d31a668ee0576987

    7abc045

    Roll clang to 07d67299a15ce03b053736e2d31a668ee0576987

    8469ce0

    Roll clang to 07d67299a15ce03b053736e2d31a668ee0576987

    305b159
  6. pull
    added a commit that references this issue on Sep 12, 2026

    Roll clang to 07d67299a15ce03b053736e2d31a668ee0576987 (flutter#192607)

    2553f89

  7. cbracken commented on Sep 16, 2026

    @cbracken
    cbracken
    on Sep 16, 2026
    MemberAuthor

    This is now fixed.

  8. cbracken
    closed this as completedon Sep 16, 2026
  9. holzgeist
    added a commit that references this issue on Sep 29, 2026

    Roll clang to 07d67299a15ce03b053736e2d31a668ee0576987 (flutter#192607)

    7848726

  10. github-actions commented on Sep 30, 2026

    @github-actions
    github-actionsbot
    on Sep 30, 2026 – with GitHub Actions

    This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

  11. github-actions
    locked as resolved and limited conversation to collaborators on Sep 30, 2026
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P0Critical issues such as a build break or regressionfyi-androidFor the attention of Android platform teamfyi-macosFor the attention of macOS platform teamplatform-iosiOS applications specificallyplatform-macosBuilding on or for macOS specificallyteam-iosOwned by iOS platform team

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