[Bug tree-optimization/21407] New: [4.1 Regression] wrong code with upcast in C++

["pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

The is huge bug which effects a large amount of C++, we should not abort.
extern "C" void abort(void);
struct T1 {int a, b; virtual void f(){}};
struct T : T1 { struct T1 w;  int b; };
void foo (struct T1 *p) { struct T *q = dynamic_cast<T*>(p); if (q->b != 2) abort (); }
int main () { struct T c; c.b = 2; foo (&c); return 0; }

-- 
           Summary: [4.1 Regression] wrong code with upcast in C++
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: critical
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
                CC: dberlin at gcc dot gnu dot org,gcc-bugs at gcc dot gnu
                    dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21407