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C4013 warns about undefined functions[1], but for some reason it's only a level 3 warning, and such suppressed by default (usually there will be link errors afterwards, though). It appears to be sensible to elevate the warning to level 1, so it will be converted to a compile error. [1] <https://learn.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-3-c4013>