[Bug c++/68258] New: core 879 Missing built-in comparison operators for pointer types not supported

[derrick at ca dot ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68258

            Bug ID: 68258
           Summary: core 879  Missing built-in comparison operators for
                    pointer types not supported
           Product: gcc
           Version: 4.8.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: derrick at ca dot ibm.com
  Target Milestone: ---

http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#879
not implemented, while clang3.6 works.
Code:

#include <cstddef>
struct X_
        {
        operator std::nullptr_t() { return nullptr; }
        };
struct Y_
        {
        operator std::nullptr_t() { return nullptr; }
        };
int main()
{
    X_ x;
    Y_ y;
    bool z = x != y;

    return 0;
}

Compile error:
main.cpp: In function 'int main()':

main.cpp:15:28: error: no match for 'operator!=' (operand types are 'X_' and
'Y_')

                 bool z = x != y;

                            ^