[Bug debug/28834] New: [4.0/4.1/4.2 Regression] -O3 -g crashes sometimes when using may_alias and structs

[pinskia at gcc dot gnu dot org]

Testcase that crashes at -O3 -g:
struct S { short x; };
typedef struct S __attribute__((__may_alias__)) test;

int f() {
  int a=10;
  test *p=(test *)&a;
  p->x = 1;
  return a;
}

int main() {
  if (f() == 10)
    __builtin_abort();
  return 0;
}

---------------------
mayalias-2.c:2: internal compiler error: in splice_child_die, at
dwarf2out.c:5513
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.


-- 
           Summary: [4.0/4.1/4.2 Regression] -O3 -g crashes sometimes when
                    using may_alias and structs
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: debug
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28834