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Asked: 2026-05-27T08:25:33+00:00

Are compiler settings set per project or once and for all? For example, can

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Are compiler settings set per project or once and for all?

For example, can one declare:

For all projects i create from this day forth, until told otherwise,
treat all warnings as errors

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  1. Editorial Team

    If you’re using Xcode*, just use shared/global xcconfig files. Definitions at the project and target levels have precedence if defined, so you can make exceptions and/or combine them in many ways.

    Xcconfig Crash Course:

    This Q+A will explain the configuration.

    Then you just fill the xcconfig file with the build settings you want, like so:

    ADDITIONAL_SDKS = 
ARCHS = x86_64
SDKROOT = macosx10.7
ONLY_ACTIVE_ARCH = NO
SUPPORTED_PLATFORMS = macosx
VALID_ARCHS = i386 ppc ppc64 ppc7400 ppc970 x86_64

    Other notes:

    • You can #include xcconfig files in xcconfig files (with some restrictions)
    • You can drag+drop build settings from Xcode’s build settings view to a text file.

    So, if all you want is “Treat warnings as errors”, your xcconfig would have this:

    GCC_TREAT_WARNINGS_AS_ERRORS = YES
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