[Bug c++/78749] New: [7 Regression] bogus warning for friend member function in anonymous namespace

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78749

            Bug ID: 78749
           Summary: [7 Regression] bogus warning for friend member
                    function in anonymous namespace
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
  Target Milestone: ---

% cat t.ii
namespace {
template <typename> struct A {
  friend void foo() {}
};
struct C : A<int> {};
}

 % g++ -Wall -c t.ii
MallocChecker.ii:3:15: warning: ‘void {anonymous}::foo()’ declared ‘static’ but
never defined [-Wunused-function]
   friend void foo() {}
               ^~~