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Compiler Error C2733

second C linkage of overloaded function 'function' not allowed

More than one overloaded function is declared with C linkage. When using C linkage, only one form of a specified function can be external. Since overloaded functions have the same undecorated name, they cannot be used with C programs.

The following sample generates C2733:

// C2733.cpp
extern "C" {
   void F1(int);

extern "C" {
   void F1();   // C2733
   // try the following line instead
   // void F2();