[Bug middle-end/50700] New: [4.6/4.7 Regression] __builtin_object_size computed wrong

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50700

             Bug #: 50700
           Summary: [4.6/4.7 Regression] __builtin_object_size computed
                    wrong
    Classification: Unclassified
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: rguenth@gcc.gnu.org


extern void abort (void);
struct S {
    int len;
    char s[0];
};
int main()
{
  char buf[sizeof (struct S) + 32];
  if (__builtin_object_size (((struct S *)&buf[0])->s, 1) != 32)
    abort ();
  return 0;
}