build_warnings

Extract and list all compiler warnings from the most recent Xcode build log. This tool parses the build output in derived data to surface warnings about deprecated APIs, type conversions, unused variables, and other issues the Swift or Clang compiler flags during compilation. Addressing these warnings improves code quality and prepares your project for future SDK changes.

Parameters

Parameter	Type	Required	Default	Description
`projectPath`	string	No	Current directory	Absolute path to the `.xcworkspace` or `.xcodeproj` file
`derivedDataPath`	string	No	Xcode default	Absolute path to the derived data directory containing build logs

Usage Examples

Check warnings for a project using default derived data

“Show me all build warnings for FitnessTracker”

{
  "projectPath": "/Users/dev/Projects/FitnessTracker/FitnessTracker.xcodeproj"
}

Check warnings with custom derived data

“List build warnings using my custom derived data path”

{
  "projectPath": "/Users/dev/Projects/FitnessTracker/FitnessTracker.xcodeproj",
  "derivedDataPath": "/tmp/FitnessTracker-DerivedData"
}

Check warnings for a workspace

“What warnings does my workspace build produce?”

{
  "projectPath": "/Users/dev/Projects/FitnessTracker/FitnessTracker.xcworkspace"
}

Check warnings using all defaults

“Show me the build warnings for the project in the current directory”

{}

Example Output

Build Warnings for FitnessTracker:

/Users/dev/Projects/FitnessTracker/FitnessTracker/Services/HealthKitManager.swift:45:9:
  warning: 'authorizationStatus(for:)' was deprecated in iOS 18.0: Use
  statusForAuthorizationType(_:) instead

/Users/dev/Projects/FitnessTracker/FitnessTracker/ViewModels/WorkoutViewModel.swift:23:13:
  warning: Variable 'tempResult' was written to, but never read

/Users/dev/Projects/FitnessTracker/FitnessTracker/Views/ActivityChartView.swift:67:28:
  warning: Conversion from 'Int' to 'Double' may lose precision

/Users/dev/Projects/FitnessTracker/FitnessTracker/Models/LegacyDataStore.swift:12:1:
  warning: 'NSKeyedUnarchiver.unarchiveObject(withFile:)' was deprecated in
  iOS 12.0: Use +unarchivedObjectOfClass:fromData:error: instead

/Users/dev/Projects/FitnessTracker/FitnessTracker/Networking/APIEndpoints.swift:34:9:
  warning: Result of call to 'append(_:)' is unused

Summary: 5 warnings across 5 files

When no warnings are found:

Build Warnings for FitnessTracker:

No warnings found in the most recent build. Clean build!

swiftlint_run — Check for style violations that the compiler does not catch
swiftlint_fix — Auto-fix code style issues alongside compiler warning resolution
xcode_build — Build the project first to generate the build log that this tool reads
swift_format_run — Check formatting after resolving compiler warnings