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    Building with static checking

    Note: This documentation describes features which are only available in the mozilla-central code repository.  They are not present any released version of Firefox.

    In addition to the normal errors and warnings provided by C++ compiler, there are often code patterns in Mozilla which are legal C++ but are nevertheless incorrect in various ways. Mozilla can now use a tool called Dehydra GCC to detect incorrect code and provide authors with instant feedback during the compile process.

    Using Static Checking

    Follow these steps to use static checking:

    • Build GCC with plugin support (see instructions on the Dehydra GCC page)
    • Build Dehydra GCC
    • Add the following line to your .mozconfig file:
    ac_add_options --with-static-checking=/path/to/

    As each C++ file in Mozilla is built, g++ will pass compilation information to config/static-checking.js. This script will perform Mozilla-specific code checking.

    To change the analyses that are run, edit config/


    The following macros are currently used to annotate classes:

    The following macros are currently used to annotate methods:

    Document Tags and Contributors

    Last updated by: amccreight,