[Bug target/83257] ICE with flexible array member and -fchkp-narrow-to-innermost-array

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83257

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-12-02
                 CC|                            |msebor at gcc dot gnu.org
     Ever confirmed|0                           |1
      Known to fail|                            |5.4.0, 6.4.0, 7.2.0, 8.0

--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed.  The first commit to trigger the ICE is r217125, which is also the
commit that introduced the -mmpx, -fcheck-pointer-bounds, and
-fchkp-narrow-to-innermost-array options, so it doesn't look like a regression.

The full stack trace with recent topo of trunk (GCC 8.0) is below:

pr83257.c: In function ‘main.chkp’:
pr83257.c:14:1: internal compiler error: Segmentation fault
 }
 ^
0xf6f521 crash_signal
        /ssd/src/gcc/git/gcc/toplev.c:325
0xb87086 is_gimple_variable
        /ssd/src/gcc/git/gcc/gimple-expr.h:83
0xb89ccb is_gimple_val(tree_node*)
        /ssd/src/gcc/git/gcc/gimple-expr.c:783
0xbf1648 force_gimple_operand_1(tree_node*, gimple**, bool (*)(tree_node*),
tree_node*)
        /ssd/src/gcc/git/gcc/gimplify-me.c:55
0xbf1872 force_gimple_operand(tree_node*, gimple**, bool, tree_node*)
        /ssd/src/gcc/git/gcc/gimplify-me.c:98
0x107fd06 chkp_force_gimple_call_op
        /ssd/src/gcc/git/gcc/tree-chkp.c:1382
0x108296e chkp_make_bounds
        /ssd/src/gcc/git/gcc/tree-chkp.c:2093
0x1086e49 chkp_narrow_bounds_to_field
        /ssd/src/gcc/git/gcc/tree-chkp.c:3407
0x1087429 chkp_parse_array_and_component_ref
        /ssd/src/gcc/git/gcc/tree-chkp.c:3546
0x10890b2 chkp_process_stmt
        /ssd/src/gcc/git/gcc/tree-chkp.c:4082
0x1089e8f chkp_instrument_function
        /ssd/src/gcc/git/gcc/tree-chkp.c:4386
0x108aafa chkp_execute
        /ssd/src/gcc/git/gcc/tree-chkp.c:4599
0x108ac52 execute
        /ssd/src/gcc/git/gcc/tree-chkp.c:4658
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