[Bug c++/38174] New: Missing some built-in candidates for operator overloading

[doug dot gregor at gmail dot com]

GCC fails to compile the following example, because it isn't generating all of
the necessary built-in candidates for operator== and operator-:

struct VolatileIntPtr {
  operator int volatile *();
};

struct ConstIntPtr {
  operator int const *();
};

void test_with_ptrs(VolatileIntPtr vip, ConstIntPtr cip) {
  bool b1 = (vip == cip);
  long p1 = vip - cip;
}

Note that in the (first) error message:
/Users/dgregor/op.cpp: In function ‘void test_with_ptrs(VolatileIntPtr,
ConstIntPtr)’:
/Users/dgregor/op.cpp:10: error: no match for ‘operator==’ in ‘vip == cip’
/Users/dgregor/op.cpp:10: note: candidates are: operator==(const int*, const
int*) <built-in>
/Users/dgregor/op.cpp:10: note:                 operator==(volatile int*,
volatile int*) <built-in>

we're missing the built-in candidate 

  operator==(const volatile int*, const volatile int*)

that would be picked.


-- 
           Summary: Missing some built-in candidates for operator
                    overloading
           Product: gcc
           Version: 4.0.1
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: doug dot gregor at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38174