> I guess you also need a way to suppress spurious warnings.

    man gcc
    ...
    You can request many specific warnings with options beginning -W, for
    example -Wimplicit to request warnings on implicit declarations.  Each
    of these specific warning options also has a negative form beginning
    -Wno- to turn off warnings; for example, -Wno-implicit.  This manual
    lists only one of the two forms, whichever is not the default.  For
    further, language-specific options also refer to C++ Dialect Options
    and Objective-C and Objective-C++ Dialect Options.

> And C compilers normally don't warn you about follies, like using global mutable state.

I mean no great disrespect, but if you need a machine to remind you not to use global mutable state, get back in the oven, you're still a bit gooey on the inside.