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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.

Example

// 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).