Can I treat a specific warning as an error?

This should do the trick: #pragma warning (error: 4715).
Or the /we4715 command line option (see /w, /W0, /W1, /W2, /W3, /W4, /w1, /w2, /w3, /w4, /Wall, /wd, /we, /wo, /Wv, /WX (Warning Level) (courtesy of Tom Sigerdas)).

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