[stable] Cherry-pick change to CanvasKit build flags to fix double download #164341
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Fixes the debug build for CanvasKit. NOTE: We need to build the debug WASM build with `-O1` because building with `-O0` causes Emscripten to produce a binary that is rejected by Chrome for having functions with too many local variables. Building with `-O1` optimizes those locals out. - [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]. <!-- 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
camsim99
approved these changes
Mar 6, 2025
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We really need this merged rather quickly. Waiting for almost three weeks… |
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autosubmit label was removed for flutter/flutter/164341, because - The status or check suite Mac clangd has failed. Please fix the issues identified (or deflake) before re-applying this label. |
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Stable Cherry Pick
Cherry-picks #162198 to stable to fix issue with double-downloading CanvasKit.
Fixes #163250
Impacted Users: All Flutter Web users
Impact Description:
canvaskit.wasm(a roughly 5 MB download) is double-downloaded. While some browsers may retrieve the second request from the cache, not all do.Workaround: None
Risk: Low (a small change to the BUILD flags for CanvasKit that prevents
canvaskit.wasmfrom being downloaded twice)Test Coverage: We don't have a test that checks how many requests there are for
canvaskit.wasmValidation Steps: Build and run any Flutter Web app and check the network requests to see that
canvaskit.wasmis only requested once.