[Bug c/69798] New: ICE on invalid code on x86_64-linux-gnu in c_parser_braced_init, at c/c-parser.c:4338

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69798

            Bug ID: 69798
           Summary: ICE on invalid code on x86_64-linux-gnu in
                    c_parser_braced_init, at c/c-parser.c:4338
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

The following code causes an ICE when compiled with the current gcc trunk on
x86_64-linux-gnu.  

It is a regression from 5.3.x. 


$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 6.0.0 20160212 (experimental) [trunk revision 233377] (GCC) 
$ 
$ 
$ 
$ gcc-5.3 -c small.c
small.c: In function ‘main’:
small.c:4:3: error: -fcilkplus must be enabled to use ‘_Cilk_spawn’
   _Cilk_spawn (void); 
   ^
small.c:4: confused by earlier errors, bailing out
$ 
$ 
$    
$ gcc-trunk -c small.c
small.c: In function ‘main’:
small.c:4:3: error: -fcilkplus must be enabled to use ‘_Cilk_spawn’
   _Cilk_spawn (void);
   ^~~~~~~~~~~
small.c:4:3: internal compiler error: in c_parser_braced_init, at
c/c-parser.c:4338
0x628b9d c_parser_braced_init
        ../../gcc-trunk/gcc/c/c-parser.c:4338
0x628da0 c_parser_postfix_expression_after_paren_type
        ../../gcc-trunk/gcc/c/c-parser.c:8092
0x61ed02 c_parser_postfix_expression
        ../../gcc-trunk/gcc/c/c-parser.c:7521
0x61f173 c_parser_postfix_expression
        ../../gcc-trunk/gcc/c/c-parser.c:8013
0x6202ba c_parser_unary_expression
        ../../gcc-trunk/gcc/c/c-parser.c:6876
0x6210b7 c_parser_cast_expression
        ../../gcc-trunk/gcc/c/c-parser.c:6705
0x6212d5 c_parser_binary_expression
        ../../gcc-trunk/gcc/c/c-parser.c:6514
0x622045 c_parser_conditional_expression
        ../../gcc-trunk/gcc/c/c-parser.c:6285
0x6226e0 c_parser_expr_no_commas
        ../../gcc-trunk/gcc/c/c-parser.c:6202
0x622e42 c_parser_expression
        ../../gcc-trunk/gcc/c/c-parser.c:8387
0x623889 c_parser_expression_conv
        ../../gcc-trunk/gcc/c/c-parser.c:8420
0x63d001 c_parser_statement_after_labels
        ../../gcc-trunk/gcc/c/c-parser.c:5275
0x63ec9b c_parser_compound_statement_nostart
        ../../gcc-trunk/gcc/c/c-parser.c:4859
0x63f51e c_parser_compound_statement
        ../../gcc-trunk/gcc/c/c-parser.c:4695
0x63b084 c_parser_declaration_or_fndef
        ../../gcc-trunk/gcc/c/c-parser.c:2107
0x6467dd c_parser_external_declaration
        ../../gcc-trunk/gcc/c/c-parser.c:1551
0x647209 c_parser_translation_unit
        ../../gcc-trunk/gcc/c/c-parser.c:1429
0x647209 c_parse_file()
        ../../gcc-trunk/gcc/c/c-parser.c:17826
0x6a85d2 c_common_parse_file()
        ../../gcc-trunk/gcc/c-family/c-opts.c:1064
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.
$ 


--------------------------


int 
main ()
{
  _Cilk_spawn (void); 
  return 0;
}