[Bug c++/59645] New: [4.7/4.8/4.9 Regression] ICE with covariant return and volatile

[reichelt at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59645

            Bug ID: 59645
           Summary: [4.7/4.8/4.9 Regression] ICE with covariant return and
                    volatile
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: reichelt at gcc dot gnu.org

The following valid code snippet triggers an ICE since GCC 4.6.0:

===========================================================
struct A { virtual ~A(); };
struct B { virtual ~B(); };
struct C : A, B {};

struct X
{
  virtual B* foo(volatile int);
};

struct Y : X
{
  virtual C* foo(volatile int);
};

C* Y::foo(volatile int) { return 0; }
===========================================================


bug.cc: In member function 'virtual C* Y::_ZTch0_h8_N1Y3fooEi(int)':
bug.cc:15:37: error: invalid argument to gimple call
 C* Y::foo(volatile int) { return 0; }
                                     ^
D.2311
retval.0_3 ={v} Y::foo (this_2(D), D.2311);
bug.cc:15:37: internal compiler error: verify_gimple failed
0xba3116 verify_gimple_in_cfg(function*)
        ../../gcc/gcc/tree-cfg.c:4854
0xacafe2 execute_function_todo
        ../../gcc/gcc/passes.c:1850
0xacb933 execute_todo
        ../../gcc/gcc/passes.c:1884
Please submit a full bug report, [etc.]