[Bug tree-optimization/77646] [5/6/7 Regression] GCC Segfault with -O3

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77646

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |trippels at gcc dot gnu.org
      Known to work|                            |4.9.4
            Summary|GCC Segfault with -O3       |[5/6/7 Regression] GCC
                   |                            |Segfault with -O3
      Known to fail|                            |5.4.0, 6.2.0, 7.0

--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
struct ccl_iterator_ccl_pointer_iterator_st {
  int (*has_more_elements)();
  void (*next_element)();
} * c;
int a;
void *ccl_real_calloc();
typedef struct {
  struct ccl_iterator_ccl_pointer_iterator_st super;
} poset_iterator;
int s_poset_iterator_has_more_elements() { return a; }
const struct ccl_iterator_ccl_pointer_iterator_st b = {
    s_poset_iterator_has_more_elements};
void ar_poset_log() {
  poset_iterator *d = ccl_real_calloc();
  d->super = b;
  c = (struct ccl_iterator_ccl_pointer_iterator_st *)d;
  struct ccl_iterator_ccl_pointer_iterator_st *i = c;
  if (i->has_more_elements(c))
    while (i->has_more_elements(c))
      i->next_element();
}