[Bug c++/65152] New: Several friend function definitions break lookup

["bugger_gcc at interia dot pl" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65152

            Bug ID: 65152
           Summary: Several friend function definitions break lookup
           Product: gcc
           Version: 4.9.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bugger_gcc at interia dot pl

When there is more than one class defining a friend function, name lookup fails
in the enclosing scope.

Live example: http://goo.gl/gwA3ej (also pasted at the bottom).

If either friend function definition at line 7 or 12 is commented out, the code
compiles and the call at line 18 correctly resolves to the global function.
However, with two friend functions defined the call results in compilation
error. The call is also resolved properly with the using declaration at line 17
uncommented, but this shouldn't be necessary since the friend functions
shouldn't alter the visibility of the global function and should only be
accessible via ADL.

The code:

void test(int);

namespace N {

struct A
{
  friend void test(A); // line 7
};

struct B
{
  friend void test(B); // line 12
};

void f()
{
  //using ::test;  // line 17
  test(0); // line 18
}

}