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XcodeWarnings.xcconfig is an Xcode configuration file that lists all warnings and static analyzer settings present in Xcode 15 and Xcode 16. Comment out any settings that won't help your project.

Accompanying blog post: Xcode Warnings: Turn Them Up to Eleven!

All warnings are enabled, with these exceptions:

Commented Out by Default

• "Pedantic Warnings" (GCC_WARN_PEDANTIC) isn't enabled because ordinary interaction with Apple's libraries makes it unhappy.
• "Treat Warnings as Errors" (GCC_TREAT_WARNINGS_AS_ERRORS and SWIFT_TREAT_WARNINGS_AS_ERRORS) aren't enabled because when experimenting with code, I sometimes temporarily comment out a line which uses a variable — which triggers the "Unused Variables" warning.
• "Unused Parameters" (GCC_WARN_UNUSED_PARAMETER) isn't enabled because it's not unusual to provide a method required by Apple's frameworks that ignores a parameter.

Not Even Included

• "Implicit Synthesized Properties" (CLANG_WARN_OBJC_MISSING_PROPERTY_SYNTHESIS) isn't included because in all likelihood, you don't need to be backwards compatible with non-modern Objective-C.
• "Disable Safety Checks" (SWIFT_DISABLE_SAFETY_CHECKS) isn't included in order to keep runtime safety checks when optimizing.
• "Inhibit All Warnings" (Apple Clang) and "Suppress Warnings" (Swift) aren't included because they're the opposite of our goals for this configuration.

The Static Analyzer is also completely enabled, including "Deep" analysis during the Build action. If that's too slow, comment out CLANG_STATIC_ANALYZER_MODE to restore faster "Shallow" analysis.

Jon Reid is the author of iOS Unit Testing by Example. His website is Quality Coding.