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[2026-10-15] eagle: personal/projects/balda/execution-broker.md personal/projects/balda/setup.md work/projects/vscode-migration/tech-design-xcode-build-server.md work/projects/vscode-migration/xcode-build-server.md

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Alexey Martemyanov committed 2026-10-15 12:41:49 +06:00
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work/projects/vscode-migration/xcode-build-server.md
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@@ -23,7 +23,7 @@ An alternative to the [[projects/vscode-migration/tech-design-spm-browser-packag
- `xcode_derived_data.py` — Xcode's DerivedData folder for the worktree (MD5 → 28 letters; honors a custom location).
- `sourcekit-xcode-bsp.sh` — `argv` of buildServer.json. Editor's server stops a running background indexer and waits for it; the indexer's server refuses to start next to an editor's. Pid files in `.build/bsp/`, checked to be sourcekit processes.
- `xcodebuild.sh <build|test> <scheme> [destination]` — Debug into Xcode's DerivedData with Xcode's settings (no `-derivedDataPath`: passing it changes build parameters and makes Xcode and VS Code rebuild after each other). `DDG_WORKTREE_CACHE=1`: `.build/xcodebuild` + shared CAS with `/^wt` `/^dd` maps. `.build/products` → products folder. xcbeautify + raw `path:line: error:` lines for failed tests.
- `simulator.sh [--build-only|--no-build] [device]` — builds iOS Browser for a concrete simulator, installs, `simctl launch --wait-for-debugger`, pid to `.build/simulator.pid`.
- `simulator.sh [--build-only|--no-build] [device]` — builds iOS Browser for a concrete simulator, installs, `simctl launch --wait-for-debugger`, writes `process attach --pid N` to `.build/simulator-attach.lldb`.
- `index-in-background.py [--all] [--if-idle]` — headless indexing; `background-indexing.sh install` = launchd agent every 30 min.
- `install-build-server.sh` + `sourcekit-xcode-bsp.patch` + `sourcekit-xcode-bsp.Package.resolved` — reproducible build of the patched BSP.
@@ -38,7 +38,7 @@ An alternative to the [[projects/vscode-migration/tech-design-spm-browser-packag
7. **CAS doesn't help the language server** (prepare-for-index doesn't cache; cold vs warm the same).
8. **Index shared with Xcode works:** with Xcode's DerivedData layout (index store = `Index.noindex/DataStore`, `INDEX_REGULAR_BUILD_*` = `Build/…`), units written by an xcodebuild build count as up to date: after building `macOS Browser`, indexing skipped all app files (2,150 files left vs 3,972). BSP prepares in `Index.noindex/SourceKitBuild` so it never shares a build DB with an open Xcode.
9. **Xcode-compatible builds:** `xcodebuild` without `-derivedDataPath` and the wrapper don't rebuild after each other (no-op 26–31 s). With `-derivedDataPath` pointing to the same folder they do.
10. **iOS simulator:** generic destination fails (`fix_libswiftWebkit_simulator.sh` needs `TARGET_DEVICE_OS_VERSION`) → build for a concrete simulator. Debugging: `simctl launch --wait-for-debugger` + lldb-dap attach by **pid** works (breakpoint in `AppDelegate`). lldb-dap with `attachCommands` or with `program` + pid never stops at breakpoints (CLI lldb does) → launch config uses `${command:pickProcess}` (newest first). VS Code substitutes variables before `preLaunchTask`, so run the task first.
10. **iOS simulator:** generic destination fails (`fix_libswiftWebkit_simulator.sh` needs `TARGET_DEVICE_OS_VERSION`) → build for a concrete simulator. Debugging in one launch: `preLaunchTask` runs `simulator.sh` (launch `--wait-for-debugger`, writes the attach command), the config attaches with `attachCommands: command source .build/simulator-attach.lldb` (read at attach time, after the task). Earlier failures of `attachCommands`/`program` were caused by the wrong `sourceMap` (10a), not by lldb-dap.
10a. **Gray breakpoints in VS Code (macOS app):** the launch configs had `sourceMap` `/^wt → worktree` for all builds. lldb also applies it in reverse when setting breakpoints, so `<worktree>/…/File.swift` became `/^wt/…/File.swift`, which regular (Xcode-mode) debug info doesn't contain → "no locations". Fix: no `sourceMap`; `xcodebuild.sh` writes `.build/debug.lldbinit` per build (source map only for `DDG_WORKTREE_CACHE=1`), launch configs `command source` it in `initCommands`. Confirmed fixed in VS Code 2026-10-15.
11. Index sharing between worktrees: rejected (absolute paths + mtime-based staleness).
12. `workspace/_pollIndex` isn't in release sourcekit-lsp → indexer waits for "Indexing" progress end + 60 s quiet; gives up after 5 min without progress.