[native_assets] create macOS CCompilerConfig via xcrun --find #175717
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This pull request refactors the discovery of C compiler tools on macOS for native assets by using the more reliable xcrun --find command. This change improves robustness, especially in environments like Nix. The tests have been updated to reflect this new implementation. My review includes a suggestion to parallelize the binary lookups for a minor performance improvement, aligning with best practices for asynchronous code.
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| return CCompilerConfig( | ||
| compiler: await _findXcrunBinary('clang'), | ||
| archiver: await _findXcrunBinary('ar'), | ||
| linker: await _findXcrunBinary('ld'), | ||
| ); |
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The three calls to _findXcrunBinary for 'clang', 'ar', and 'ld' are independent asynchronous operations. To improve performance, they can be run concurrently using Future.wait instead of sequentially. This aligns with the style guide's recommendation to follow Effective Dart.1
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| return CCompilerConfig( | |
| compiler: await _findXcrunBinary('clang'), | |
| archiver: await _findXcrunBinary('ar'), | |
| linker: await _findXcrunBinary('ld'), | |
| ); | |
| final List<Uri> results = await Future.wait(<Future<Uri>>[ | |
| _findXcrunBinary('clang'), | |
| _findXcrunBinary('ar'), | |
| _findXcrunBinary('ld'), | |
| ]); | |
| return CCompilerConfig( | |
| compiler: results[0], | |
| archiver: results[1], | |
| linker: results[2], | |
| ); |
Style Guide References
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I'd argue this hurts readability more than it helps performance--this is not even close to a performance bottleneck as-is.
dcharkes
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Sep 23, 2025
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Thanks @GregoryConrad ! 🙏
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Hey, any updates on this? @vashworth |
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autosubmit label was removed for flutter/flutter/175717, because The base commit of the PR is older than 7 days and can not be merged. Please merge the latest changes from the main into this branch and resubmit the PR. |
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autosubmit label was removed for flutter/flutter/175717, because This PR has not met approval requirements for merging. The PR author is not a member of flutter-hackers and needs 1 more review(s) in order to merge this PR.
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@dcharkes you know who I can bug to get a second reviewer here? 😛 |
vashworth
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Oct 9, 2025
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…r#175717) Previously, the macOS `CCompilerConfig` for native assets was created via running `xcrun clang --version`, but this is not always reliable (i.e., when running under Nix on macOS). Thus, this commit introduces a new mechanism to find the CCompilerConfig binaries using `xcrun --find`, which is a more standard way of finding development-related binaries on macOS (and is also properly supported in Nix's `xcrun` wrapper). Fixes flutter#175553 CC @dcharkes -- I think this is the last of the changes needed for Nix support in Native Assets (as far as I can tell...) ## 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. <!-- 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
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Previously, the macOS
CCompilerConfigfor native assets was created via runningxcrun clang --version, but this is not always reliable (i.e., when running under Nix on macOS). Thus, this commit introduces a new mechanism to find the CCompilerConfig binaries usingxcrun --find, which is a more standard way of finding development-related binaries on macOS (and is also properly supported in Nix'sxcrunwrapper).Fixes #175553
CC @dcharkes -- I think this is the last of the changes needed for Nix support in Native Assets (as far as I can tell...)
Pre-launch Checklist
///).