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Handily, gcc has -Werror, which turns all warnings into errors. So -Wall -Wextra -Werror should catch most things.

Of course. You and I know they're doing it wrong, however sirclueless suggested above that type correctness is "arcane" and asks if "we would really care" when it comes to type issues in printf format strings.

Except if you're using gcc (mingw) on Windows:

gcc -v shows that it's been configured with --disable-werror