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Starting with Xcode 26, when a precompiled file changes (like a header file in the Flutter framework), it throws an error. This PR adds a fingerprinter to track changes to the headers. If the fingerprinting detects a change, it cleans before building. This only applies to Xcode 26 and incremental builds. Fresh builds should not clean.

Fixes #176462.

Pre-launch Checklist

If you need help, consider asking for advice on the #hackers-new channel on Discord.

Note: The Flutter team is currently trialing the use of Gemini Code Assist for GitHub. Comments from the gemini-code-assist bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed.

@github-actions github-actions bot added platform-ios iOS applications specifically tool Affects the "flutter" command-line tool. See also t: labels. team-ios Owned by iOS platform team labels Oct 24, 2025
@vashworth vashworth marked this pull request as ready for review October 24, 2025 21:11
@vashworth vashworth requested a review from a team as a code owner October 24, 2025 21:11
@vashworth vashworth requested a review from bkonyi October 24, 2025 21:11
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LGTM overall!

@vashworth vashworth added the autosubmit Merge PR when tree becomes green via auto submit App label Oct 27, 2025
@auto-submit auto-submit bot added this pull request to the merge queue Oct 27, 2025
Merged via the queue into flutter:master with commit ac90945 Oct 27, 2025
146 of 147 checks passed
@flutter-dashboard flutter-dashboard bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Oct 27, 2025
@vashworth vashworth added the revert Autorevert PR (with "Reason for revert:" comment) label Oct 27, 2025
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vashworth commented Oct 27, 2025

Reason for revert: May cause error

Error (Xcode): Could not delete `/build/ios/Release-iphoneos`
because it was not created by the build system and it is not a subfolder of derived data.

auto-submit bot pushed a commit that referenced this pull request Oct 27, 2025
@auto-submit auto-submit bot removed the revert Autorevert PR (with "Reason for revert:" comment) label Oct 27, 2025
github-merge-queue bot pushed a commit that referenced this pull request Oct 27, 2025
…" (#177610)

<!-- start_original_pr_link -->
Reverts: #177512
<!-- end_original_pr_link -->
<!-- start_initiating_author -->
Initiated by: vashworth
<!-- end_initiating_author -->
<!-- start_revert_reason -->
Reason for reverting: May cause error:
```
Error (Xcode): Could not delete `/build/ios/Release-iphoneos`
because it was not created by the build system and it is not a subfolder of derived data.
```
<!-- end_revert_reason -->
<!-- start_original_pr_author -->
Original PR Author: vashworth
<!-- end_original_pr_author -->

<!-- start_reviewers -->
Reviewed By: {bkonyi}
<!-- end_reviewers -->

<!-- start_revert_body -->
This change reverts the following previous change:
Starting with Xcode 26, when a precompiled file changes (like a header
file in the Flutter framework), it throws an error. This PR adds a
fingerprinter to track changes to the headers. If the fingerprinting
detects a change, it cleans before building. This only applies to Xcode
26 and incremental builds. Fresh builds should not clean.

Fixes #176462.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

**Note**: The Flutter team is currently trialing the use of [Gemini Code
Assist for
GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code).
Comments from the `gemini-code-assist` bot should not be taken as
authoritative feedback from the Flutter team. If you find its comments
useful you can update your code accordingly, but if you are unsure or
disagree with the feedback, please feel free to wait for a Flutter team
member's review for guidance on which automated comments should be
addressed.

<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

<!-- end_revert_body -->

Co-authored-by: auto-submit[bot] <[email protected]>
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Oct 28, 2025
auto-submit bot pushed a commit to flutter/packages that referenced this pull request Oct 28, 2025
flutter/flutter@4c91098...7cf0dc1

2025-10-28 [email protected] Roll Skia from 602bbd4af8f9 to e4d3d8f31aef (4 revisions) (flutter/flutter#177647)
2025-10-28 [email protected] Fix AppBar Semantics namesRoute for mismatched platforms (flutter/flutter#176694)
2025-10-28 [email protected] Fix Popup menu Semantics label for mismatched platforms (flutter/flutter#177049)
2025-10-28 [email protected] Roll Skia from 8b2d056701df to 602bbd4af8f9 (1 revision) (flutter/flutter#177628)
2025-10-28 [email protected] Roll Skia from 5723f87f8530 to 8b2d056701df (3 revisions) (flutter/flutter#177626)
2025-10-27 [email protected] Roll Skia from 170c11f1ddc5 to 5723f87f8530 (6 revisions) (flutter/flutter#177618)
2025-10-27 [email protected] Enhance DropdownMenuEntry's labelWidget docs (flutter/flutter#177160)
2025-10-27 [email protected] Regenerated lockfiles for New Template Values (flutter/flutter#177617)
2025-10-27 [email protected] Correct editable text and placeholder position in baseline aligned stack (flutter/flutter#177342)
2025-10-27 49699333+dependabot[bot]@users.noreply.github.com Bump actions/upload-artifact from 4 to 5 in the all-github-actions group (flutter/flutter#177620)
2025-10-27 [email protected] add gn flag to optimize builds for size (flutter/flutter#176835)
2025-10-27 [email protected] disable metal for crosscompile from mac to linux (flutter/flutter#176639)
2025-10-27 [email protected] [DDM] enable host builds in the merge queue (flutter/flutter#177446)
2025-10-27 [email protected] Disable vulkan X11 support when building for minimal linux (flutter/flutter#176697)
2025-10-27 [email protected] Roll Skia from 77348c40d101 to 170c11f1ddc5 (6 revisions) (flutter/flutter#177602)
2025-10-27 [email protected] Set the font weight variation axis based on the text style's FontWeight (flutter/flutter#175771)
2025-10-27 [email protected] Fixed `RuntimeEffect` with `ImageFilter.compose` (flutter/flutter#177510)
2025-10-27 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Clean before building when framework headers change (#177512)" (flutter/flutter#177610)
2025-10-27 [email protected] [skia] Disable legacy png encoding/decoding in skp (flutter/flutter#177462)
2025-10-27 [email protected] Clean before building when framework headers change (flutter/flutter#177512)
2025-10-27 [email protected] Roll dartdoc to 9.0.0 (flutter/flutter#177590)
2025-10-27 [email protected] Fix typo in comment about `manifestFile` in `DeepLinkJsonFromManifestTaskHelper.kt‎` (flutter/flutter#177538)
2025-10-27 [email protected] Fix RoundedSuperellipse crashes for tiny corners (flutter/flutter#177070)
2025-10-27 [email protected] Roll Packages from 53d6138 to bbf96a0 (7 revisions) (flutter/flutter#177588)
2025-10-27 [email protected] Fix missing list indicators in CHANGELOG.md (flutter/flutter#177484)
2025-10-27 [email protected] [ Tool ] Add `Stream.transformWithCallSite` to provide more useful stack traces (flutter/flutter#177470)
2025-10-27 [email protected] Roll Skia from 06243224ecf0 to 77348c40d101 (1 revision) (flutter/flutter#177585)
2025-10-27 [email protected] Add guided error for precompiled cache error (flutter/flutter#177327)
2025-10-27 [email protected] Roll Fuchsia Linux SDK from tKrvmvTOQITL81oOC... to ir6J2isKAYa1jNLyJ... (flutter/flutter#177578)
2025-10-27 [email protected] Roll Skia from 784ed1787bd6 to 06243224ecf0 (1 revision) (flutter/flutter#177575)
2025-10-27 [email protected] Roll Skia from de52b3a7585a to 784ed1787bd6 (5 revisions) (flutter/flutter#177571)

If this roll has caused a breakage, revert this CL and stop the roller
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Please CC [email protected],[email protected] on the revert to ensure that a human
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flutter-zl pushed a commit that referenced this pull request Oct 31, 2025
Starting with Xcode 26, when a precompiled file changes (like a header
file in the Flutter framework), it throws an error. This PR adds a
fingerprinter to track changes to the headers. If the fingerprinting
detects a change, it cleans before building. This only applies to Xcode
26 and incremental builds. Fresh builds should not clean.

Fixes #176462.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

**Note**: The Flutter team is currently trialing the use of [Gemini Code
Assist for
GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code).
Comments from the `gemini-code-assist` bot should not be taken as
authoritative feedback from the Flutter team. If you find its comments
useful you can update your code accordingly, but if you are unsure or
disagree with the feedback, please feel free to wait for a Flutter team
member's review for guidance on which automated comments should be
addressed.

<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md
flutter-zl pushed a commit that referenced this pull request Oct 31, 2025
…" (#177610)

<!-- start_original_pr_link -->
Reverts: #177512
<!-- end_original_pr_link -->
<!-- start_initiating_author -->
Initiated by: vashworth
<!-- end_initiating_author -->
<!-- start_revert_reason -->
Reason for reverting: May cause error:
```
Error (Xcode): Could not delete `/build/ios/Release-iphoneos`
because it was not created by the build system and it is not a subfolder of derived data.
```
<!-- end_revert_reason -->
<!-- start_original_pr_author -->
Original PR Author: vashworth
<!-- end_original_pr_author -->

<!-- start_reviewers -->
Reviewed By: {bkonyi}
<!-- end_reviewers -->

<!-- start_revert_body -->
This change reverts the following previous change:
Starting with Xcode 26, when a precompiled file changes (like a header
file in the Flutter framework), it throws an error. This PR adds a
fingerprinter to track changes to the headers. If the fingerprinting
detects a change, it cleans before building. This only applies to Xcode
26 and incremental builds. Fresh builds should not clean.

Fixes #176462.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

**Note**: The Flutter team is currently trialing the use of [Gemini Code
Assist for
GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code).
Comments from the `gemini-code-assist` bot should not be taken as
authoritative feedback from the Flutter team. If you find its comments
useful you can update your code accordingly, but if you are unsure or
disagree with the feedback, please feel free to wait for a Flutter team
member's review for guidance on which automated comments should be
addressed.

<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

<!-- end_revert_body -->

Co-authored-by: auto-submit[bot] <[email protected]>
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