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Enables the `swift` tool in the gn mac toolchain and wires up support for Swift `source_set` targets. Ports `FlutterRunLoop` to Swift. * Adds `//flutter/build/config/mac:compiler` config that sets up `swiftflags` for the `swift` tool in the toolchain for macOS, and adds it to the default configs on `is_mac` builds. * Adds `mac_swift_lib_paths` in `engine/src/build/config/apple/apple_sdk.gni` which holds the path of Swift shared libraries for macOS targets. This is within the appropriate `macosx` SDK directory within Xcode. Finally, this code adds Swift code to the embedder and embedder tests as proof of concept and to prevent regressions. This ports `FlutterRunLoop` to Swift in order to verify Objective-C imports of Swift via the bridging header. Issue: https://github.com/flutter/flutter/issues/144791 ## 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]. <!-- 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 Engine
Setting up the Engine development environment
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gclient bootstrap
Flutter engine uses gclient to manage dependencies.
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