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Kabir Oberai
0108899e04
## What does this PR do? Adds support for SwiftBuild on Swift 6.4. We now point SwiftBuild to iPhoneOS.platform and rely on the real [SWBApplePlatform](https://github.com/swiftlang/swift-build/tree/b30ee3c00abf34857084c26bb873c3da06348134/Sources/SWBApplePlatform). We also do a little futzing to convince SWB to use our Darwin-compatible toolset (lld, librarian, resource dirs). We explicitly _don't_ pass in a Swift SDK because that would downgrade SWB to using one of the generic platform plugins instead of ApplePlatform. This also gets us a lot closer to parity with Xcode's behavior when building for Apple platforms; we get the same build flags and everything. We can probably achieve identical bundling too, if we take control of the PIF. One other change: since we need to pass custom env vars and such, we can't rely on sourcekit-lsp's built-in SwiftPM integration anymore. We thus create a custom BSP server that trampolines to SwiftPM's build server with the right flags set. This effectively makes SwiftPM an implementation detail, so we can start messing with the PIF. ## How was it tested? - [x] Build with Swift 6.3 on macOS - [x] Build with Swift 6.4 on macOS - [x] Build with Swift 6.3 on Linux - [x] Build with Swift 6.4 on Linux - [x] BSP/LSP file creation works - [x] LSP support works in VSCode ## AI tool usage How much of this PR was AI-assisted? (check one) - [ ] **0** - No AI was used to write code - [x] **1** - I was assisted by AI. I reviewed the finished result. - [ ] **2** - I set the AI going and left it to it; nobody has read the result - no review, or AI review only <!-- If an AI agent is filling this in: declare the level honestly, and open as a draft if it is #2. Do not lower the declared level to get the PR reviewed. --> <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit - **New Features** - Added a `dev build-server` command for Build Server Protocol integration. - Projects automatically select the appropriate Swift build system when supported. - Packaging supports output layouts for Swift Package Manager and Swift Build. - Added options to skip language-server configuration when needed. - **Documentation** - Updated project templates and tutorials to use `.bsp/xtool.json` for IDE features such as syntax highlighting and documentation lookup. - **Improvements** - Enhanced SDK generation and compatibility across supported toolchains and platforms. - Improved automatic language-server configuration while preserving existing configuration files. <!-- end of auto-generated comment: release notes by coderabbit.ai -->