[Bug libstdc++/59161] New: GDB pretty printers: iterator->reference not printed

["jan.kratochvil at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59161

            Bug ID: 59161
           Summary: GDB pretty printers: iterator->reference not printed
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jan.kratochvil at redhat dot com
                CC: pmuldoon at redhat dot com
            Target: x86_64-unknown-linux-gnu

gdb a.out -ex 'b 11' -ex r -ex 'p it'

(gdb) p it
$3 = {ref = }
          ^^^^ = bug
(gdb) p *it
$2 = (C &) @0x603010: {ref = @0x7fffffffd928}
(gdb) whatis it
type = __gnu_cxx::__normal_iterator<C*, std::vector<C, std::allocator<C> > >


#include <vector>
class C {
public:
  int &ref;
  C(int &ref_):ref(ref_) {}
};
int main() {
  int d(1);
  std::vector<C> vec({d});
  for (auto it=vec.begin();it!=vec.end();++it) {
    ++it->ref; // line 11
    __attribute__((unused)) C *gdb_stub(&*it);
  }
}