Error C2733: second C linkage of overloaded function (function) not allowed

Cause

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. Ex:

extern "C" {
   void F1(int);
}

extern "C" {
   void F1();   // C2733
}

Solution

Possible resolution:

extern "C" {
   void F1(int);
}

extern "C" {
   void F2();
}

About This Article

This article is a derivative work based on Compiler Error C2733 which is provided by MSDN Community Content - Visual C++.