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.
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
CXX=/path/to/gcc-with-plugin-support/bin/g++ ac_add_options --with-static-checking=/path/to/gcc_treehydra.so
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/static-checking-config.mk.