[cfe-dev] [Bug] Undefined reference to function template declared friend and defined in template class

[suyog sarda]

Hi,

This is regarding g++ test case
g++.old-deja/g++.pt/friend10.C

*template <class T>
void f(T);

template <class U>
class C
{
  template <class T>
  friend void f(T)
  {
     C<U> c;
     c.i = 3;
  }

  public :

     void g()
     {
       f(3.0);
     }
    int i;
};

int main ()
{
  f(7);
  C<double> c;
  c.g();
}*


Here, even when the body of function *f()* is defined, compiler throws
error :





*In function `main':19095.C:(.text+0x16): undefined reference to `void
f<int>(int)'/tmp/19095-fd27b4.o: In function
`C<double>::g()':19095.C:(.text._ZN1CIdE1gEv[_ZN1CIdE1gEv]+0x1b): undefined
reference to `void f<double>(double)'clang-3.5: error: linker command
failed with exit code 1*

I have filed a bug related to this llvm.org/bugs/show_bug.cgi?id=19095

g++ compiles this without any error.

Please help in verifying if above is real bug. In my view this is a bug
since function body has been defined and as it is declared friend it is a
non-member function of class template.

-- 
With regards,
Suyog Sarda
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