Compiler Warning (level 4) C4220


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varargs matches remaining parameters

Under the default Microsoft extensions (/Ze), a pointer to a function matches a pointer to a function with similar, but variable, arguments.

// C4220.c  
// compile with: /W4  
int ( *pFunc1) ( int a, ... );  
int ( *pFunc2) ( int a, int b);  
int main()  
   if ( pFunc1 != pFunc2 ) {};  // C4220  

Such pointers do not match under ANSI compatibility (/Za).