[Bug lto/64043] New: [5 Regression] ICE (segfault) with LTO: in tree_check/tree.h:2758 get_binfo_at_offset/tree.c:11914

[burnus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64043

            Bug ID: 64043
           Summary: [5 Regression] ICE (segfault) with LTO: in
                    tree_check/tree.h:2758
                    get_binfo_at_offset/tree.c:11914
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org

Created attachment 34087
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34087&action=edit
Test case (unpack, run "make")

Using GCC 5.0.0 20141121, the attached program fails with the following ICE.

To reproduce: Unpack and hit "make". It will compile one.ii and two.ii and
gcc-ar them to libonetwo.ii; it compiles three.ii - and then LTOs them
together.

(Requires an LD with plugin capabilities; I've put the git version of binutils
into the path.)

The failure is:

0xa36e4f crash_signal
        ../../gcc/toplev.c:359
0xc97211 tree_check(tree_node*, char const*, int, char const*, tree_code)
        ../../gcc/tree.h:2758
0xc97211 get_binfo_at_offset(tree_node*, long, tree_node*)
        ../../gcc/tree.c:11914
0x884cf4 possible_polymorphic_call_targets(tree_node*, long,
ipa_polymorphic_call_context, bool*, void**, bool)
        ../../gcc/ipa-devirt.c:2404
0x7ef9d7 possible_polymorphic_call_targets(tree_node*, gimple_statement_base*,
bool*, void**)
        ../../gcc/ipa-utils.h:126
0x7edcd0 gimple_fold_call
        ../../gcc/gimple-fold.c:2667
0x7edcd0 fold_stmt_1
        ../../gcc/gimple-fold.c:3246
0xb55323 execute
        ../../gcc/tree-ssa-forwprop.c:2228