BUG: No Warning Using Extern "C" in a Namespace

MORE INFORMATION

Sample Code to Reproduce Problem

/test1.cpp
/* Compile options needed: -W4
*/ 
namespace A{
   extern "C" void printf(int);
}

void main(){
   A::printf(1); // actually resolves to CRT printf
                 // which causes an access violation
}
//end of test1.cpp

//test2.cpp

/* Compile options needed: -W4
*/ 

#include <iostream.h>

namespace A{
   extern "C" void  function(void){cout <<"namespace A" <<endl;};

}

namespace B{
   extern "C" void function(void){cout <<"namespace B" <<endl;};

}

void main(){
    A::function();
   B::function();

}
// end of test2.cpp