[Bug c++/70865] New: [cilkplus] errors when using cilk features with precompiled headers

["ryan.burn at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70865

            Bug ID: 70865
           Summary: [cilkplus] errors when using cilk features with
                    precompiled headers
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ryan.burn at gmail dot com
  Target Milestone: ---

Created attachment 38372
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38372&action=edit
example that reproduces the problem

Using cilk features in a precompiled header file causes various compilation
bugs if the options "-std=c++1z" and "-fconcepts" are also used. I attached an
example that reproduces the bug. The code should compile fine (and does so, if
not using a pch or not using cilk features), but depending on what options are
used, gcc produces these different errors.

Using both "-std=c++1z -fconcepts -fcilkplus" (reproduced with Makefile),
causes the error:

cc1plus: error: using result of function returning âvoidâ
(null):0: confused by earlier errors, bailing out
make: *** [a] Error 1



Using just "-std=c++1z" (Makefile.v2), causes the error:

cc1plus: internal compiler error: Segmentation fault
0xb45bff crash_signal
        ../../gcc/gcc/toplev.c:333
0x95565c gimplify_call_expr
        ../../gcc/gcc/gimplify.c:2486
0x94d339 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../gcc/gcc/gimplify.c:10258
0x95a381 force_gimple_operand_1(tree_node*, gimple**, bool (*)(tree_node*),
tree_node*)
        ../../gcc/gcc/gimplify-me.c:78
0x95a47f force_gimple_operand_gsi_1(gimple_stmt_iterator*, tree_node*, bool
(*)(tree_node*), tree_node*, bool, gsi_iterator_update)
        ../../gcc/gcc/gimplify-me.c:115
0xa5a757 expand_task_call
        ../../gcc/gcc/omp-low.c:6865
0xa5a757 expand_omp_taskreg
        ../../gcc/gcc/omp-low.c:7423
0xa6103f expand_omp
        ../../gcc/gcc/omp-low.c:13799
0xa637ad execute_expand_omp
        ../../gcc/gcc/omp-low.c:14028
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
make: *** [a] Error 1