E2337 Only one of a set of overloaded functions can be "C" (C++)

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C++ functions are by default overloaded, and the compiler assigns a new name to each function.

If you wish to override the compiler's assigning a new name by declaring the function extern "C", you can do this for only one of a set of functions with the same name.

(Otherwise the linker would find more than one global function with the same name.)