[Bug ipa/61283] New: [4.10 regression] SEGV in pass_ipa_comdats::execute

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61283

            Bug ID: 61283
           Summary: [4.10 regression] SEGV in pass_ipa_comdats::execute
           Product: gcc
           Version: 4.10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ro at gcc dot gnu.org
                CC: hubicka at gcc dot gnu.org
              Host: i386-pc-solaris2.11
            Target: i386-pc-solaris2.11
             Build: i386-pc-solaris2.11

As of r210682, there are a couple of testsuite regressions on Solaris 11/x86
with
gas and ld, both 32 and 64-bit:

FAIL: g++.dg/torture/pr46367.C  -O1  (internal compiler error)
FAIL: g++.dg/torture/pr46367.C  -O1  (test for excess errors)
FAIL: g++.dg/torture/pr46367.C  -Os  (internal compiler error)
FAIL: g++.dg/torture/pr46367.C  -Os  (test for excess errors)

$ cc1plus -fpreprocessed pr46367.ii -quiet -O1 -o pr46367.s
/vol/gcc/src/hg/trunk/local/gcc/testsuite/g++.dg/torture/pr46367.C:11:4:
internal compiler error: Segmentation Fault
 S s;
    ^
0x88b844c crash_signal
        /vol/gcc/src/hg/trunk/local/gcc/toplev.c:337
0x8de329a ipa_comdats
        /vol/gcc/src/hg/trunk/local/gcc/ipa-comdats.c:320
0x8de329a execute
        /vol/gcc/src/hg/trunk/local/gcc/ipa-comdats.c:371

Under gdb, I find

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1 (LWP 1)]
ipa_comdats () at /vol/gcc/src/hg/trunk/local/gcc/ipa-comdats.c:320
320               tree group = *map.contains (symbol);
(gdb) where
#0  ipa_comdats () at /vol/gcc/src/hg/trunk/local/gcc/ipa-comdats.c:320
#1  (anonymous namespace)::pass_ipa_comdats::execute (this=0x95a8500)
    at /vol/gcc/src/hg/trunk/local/gcc/ipa-comdats.c:371
#2  0x088007d8 in execute_one_pass (pass=0x95a8500)
    at /vol/gcc/src/hg/trunk/local/gcc/passes.c:2180
#3  0x08801251 in execute_ipa_pass_list (pass=0x95a8500)
    at /vol/gcc/src/hg/trunk/local/gcc/passes.c:2571
#4  0x0857a19f in ipa_passes ()
    at /vol/gcc/src/hg/trunk/local/gcc/cgraphunit.c:2093
#5  compile () at /vol/gcc/src/hg/trunk/local/gcc/cgraphunit.c:2183
#6  0x0857ab9b in finalize_compilation_unit ()
    at /vol/gcc/src/hg/trunk/local/gcc/cgraphunit.c:2338
#7  0x08370eeb in cp_write_global_declarations ()
    at /vol/gcc/src/hg/trunk/local/gcc/cp/decl2.c:4625
#8  0x088b8505 in compile_file ()
    at /vol/gcc/src/hg/trunk/local/gcc/toplev.c:562
#9  0x088ba56b in do_compile ()
    at /vol/gcc/src/hg/trunk/local/gcc/toplev.c:1915
#10 toplev_main (argc=7, argv=0xfeffe4cc)
    at /vol/gcc/src/hg/trunk/local/gcc/toplev.c:1991
#11 0x090750ab in main (argc=7, argv=0xfeffe4cc)
    at /vol/gcc/src/hg/trunk/local/gcc/main.c:36

  Rainer