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Check for versions of macOS and Xcode that are unsupported for traced Swift analysis - #4221

Draft

mbg wants to merge 12 commits into

mbg/diagnostics/failed-sariffrom

mbg/macos27/warn

Commits on Oct 9, 2026
- Add e2e test
  mbg
  committed
  f2412f8
- Fix `flushDiagnostics` not ensuring directories exist
  mbg
  committed
  520eff7
- Add `macOSVersion` helper
  mbg
  committed
  b2d253e
- Refactor swift check out of `init-action.ts`
  mbg
  committed
  8ac4f44
- Use `macOSVersion` in `isSwiftCompatible`
  mbg
  committed
  d6fd306
- Add `swiftSupportsAllPlatforms` to `ToolsFeature`
  mbg
  committed
  6afbf5f
- Skip Swift checks if tools feature is enabled
  mbg
  committed
  3a8c4db
- Check if macOS version is unsupported
  mbg
  committed
  02a4e81
- Add FF to fail if macOS version is unsupported
  mbg
  committed
  b458b9f
- Add function to determine Xcode version based on symlink
  mbg
  committed
  39546d5
- Make `FS` available to `isSwiftCompatible`
  mbg
  committed
  a4bb2b4
- Check if Xcode version is unsupported
  mbg
  committed
  8baf1db