[Bug c++/37006] New: explicitly deleted inline function gives warning "used but never defined"

[chris dot fairles at gmail dot com]

Given the following snip:

template<class T>
struct A {
  template<class U>
  bool operator==(const A<U>&) = delete;
  operator bool () { return true; }
};

int main()
{
  A<int> a1;
  A<void> a2;
  if(a1 == a2) {}
}

Compilation with g++44 -std=gnu++0x gives:
error: deleted function bool A<T>::operator==(const A<U>&) [with U = void, T =
int]
which is correct but it also issues:
At global scope:
warning: inline function bool A<T>::operator==(const A<U>&) [with U = void, T =
int] used but never defined

A similar test case without templates works as expected:
struct B {};

struct C
{
  bool operator==(const B&) = delete;
  operator bool () { return true; }
};

int main() {
  B b;
  C c;
  if(c == a) {}
}

That is, it gives only the error for the deleted function (and where its used).


-- 
           Summary: explicitly deleted inline function gives warning "used
                    but never defined"
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: chris dot fairles at gmail dot com
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37006