[Bug bootstrap/64676] New: [5.0 Regression] SEGV in tree-ssa-structalias.c solve_constraint

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64676

            Bug ID: 64676
           Summary: [5.0 Regression] SEGV in tree-ssa-structalias.c
                    solve_constraint
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: blocker
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dje at gcc dot gnu.org

$ cat conftest.c
int
main ()
{

  ;
  return 0;
}

(gdb) run -O conftest.c
Starting program: /tmp/20150119/gcc/cc1 -O conftest.c
 main
Analyzing compilation unit
Performing interprocedural optimizations
 <*free_lang_data> <visibility> <build_ssa_passes> <chkp_passes>
<opt_local_passes>
Program received signal SIGSEGV, Segmentation fault.
0x100eb7fc in _ZL17solve_constraintsv ()
    at /nasfarm/edelsohn/src/src/gcc/tree-ssa-structalias.c:8000
(gdb) where
#0  0x100eb7fc in _ZL17solve_constraintsv ()
    at /nasfarm/edelsohn/src/src/gcc/tree-ssa-structalias.c:8000
#1  0x100f7860 in _Z19compute_may_aliasesv ()
    at /nasfarm/edelsohn/src/src/gcc/tree-ssa-structalias.c:14010
#2  0x103c31ac in _ZL21execute_function_todoP8functionPv (fn=0x5b5b0000, 
    data=0x8) at /nasfarm/edelsohn/src/src/gcc/passes.c:1927
#3  0x103c3f24 in _ZL15do_per_functionPFvP8functionPvES1_ (
    callback=@0x30299ae4: 0x103c3108 <_ZL21execute_function_todoP8functionPv>, 
    data=0x3005f550 <cfun>) at /nasfarm/edelsohn/src/src/gcc/passes.c:1647
#4  0x103c41e4 in _ZL12execute_todoj (flags=1048640)
    at /nasfarm/edelsohn/src/src/gcc/passes.c:2012
#5  0x103c7f38 in _Z16execute_one_passP8opt_pass (pass=0x30300c78)
    at /nasfarm/edelsohn/src/src/gcc/passes.c:2339
#6  0x103c840c in _ZL19execute_pass_list_1P8opt_pass.constprop.71 (
    pass=0x30300c78) at /nasfarm/edelsohn/src/src/gcc/passes.c:2378
#7  0x103c8424 in _ZL19execute_pass_list_1P8opt_pass.constprop.71 (
    pass=0x30300a98) at /nasfarm/edelsohn/src/src/gcc/passes.c:2379
#8  0x103c84d4 in _Z17execute_pass_listP8functionP8opt_pass (fn=0x70008068, 
    pass=0x30300958) at /nasfarm/edelsohn/src/src/gcc/passes.c:2389
#9  0x103c62b8 in _Z24do_per_function_toporderPFvP8functionPvES1_ (
    callback=@0x30299c94: 0x103c84a8
<_Z17execute_pass_listP8functionP8opt_pass>, data=0x30300958) at
/nasfarm/edelsohn/src/src/gcc/passes.c:1724
#10 0x103c8f50 in _Z21execute_ipa_pass_listP8opt_pass (pass=0x30300908)