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template <class T> class A;
template <class T, class U>
void operator*(A<T>, A<U>);
 
template <class T>
class A {
    template <class X, class U>
    friend void ::operator*(A<X>, A<U>);
    void friends_only();
};
 
template <class T, class U>
void operator*(A<T> a, A<U>) {
  a.friends_only();
}
 
int m()
{
    A<int> a;
    A<void> b;
    a*b;
}

/usr/lib/gcc/i686-pc-linux-gnu/4.5.1/../../../crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
/home/KeFflr/ccmz5usj.o: In function `m()':
prog.cpp:(.text+0xf): undefined reference to `A<int>::friends_only()'
collect2: ld returned 1 exit status

Standard output is empty