[Bug c/71265] New: gcc ICE on x86_64-linux-gnu with “seg fault”

[helloqirun at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71265

            Bug ID: 71265
           Summary: gcc ICE on x86_64-linux-gnu with “seg fault”
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: helloqirun at gmail dot com
  Target Milestone: ---

The following invalid code causes an ICE when compiled with the current gcc
trunk on x86_64-linux-gnu in both 32-bit and 64-bit modes. 

This piece of code is syntactically valid since it can be parsed by an ANSI C
parser.

It crashes every release of gcc since gcc-3.4 (I did not have earlier versions
installed on my machine).



$ gcc-3.4 abc.c
abc.c: In function `ID':
abc.c:0: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
For Debian GNU/Linux specific bug reporting instructions,
see <URL:file:///usr/share/doc/gcc-3.4/README.Bugs>.



$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/home/absozero/trunk/root-gcc/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/absozero/trunk/root-gcc
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 7.0.0 20160524 (experimental) [trunk revision 236651] (GCC) 



$ gcc-trunk abc.c
abc.c:1:8: warning: return type defaults to ‘int’ [-Wimplicit-int]
 extern ID ( ID ) extern ID [ __func__ ] ; { }
        ^~
In function ‘ID’:
cc1: internal compiler error: Segmentation fault
0xbac48f crash_signal
        ../../gcc/gcc/toplev.c:333
0x652fb3 bind
        ../../gcc/gcc/c/c-decl.c:718
0x666ce8 c_make_fname_decl
        ../../gcc/gcc/c/c-decl.c:3996
0x6e89a1 fname_decl(unsigned int, unsigned int, tree_node*)
        ../../gcc/gcc/c-family/c-common.c:1006
0x6ab2cb c_parser_postfix_expression
        ../../gcc/gcc/c/c-parser.c:7627
0x6ad68a c_parser_unary_expression
        ../../gcc/gcc/c/c-parser.c:6939
0x6ae487 c_parser_cast_expression
        ../../gcc/gcc/c/c-parser.c:6768
0x6ae6a2 c_parser_binary_expression
        ../../gcc/gcc/c/c-parser.c:6577
0x6af385 c_parser_conditional_expression
        ../../gcc/gcc/c/c-parser.c:6348
0x6afa20 c_parser_expr_no_commas
        ../../gcc/gcc/c/c-parser.c:6265
0x6c404e c_parser_direct_declarator_inner
        ../../gcc/gcc/c/c-parser.c:3567
0x6c7370 c_parser_declaration_or_fndef
        ../../gcc/gcc/c/c-parser.c:1816
0x6c7f78 c_parser_declaration_or_fndef
        ../../gcc/gcc/c/c-parser.c:2094
0x6d37bd c_parser_external_declaration
        ../../gcc/gcc/c/c-parser.c:1549
0x6d41e9 c_parser_translation_unit
        ../../gcc/gcc/c/c-parser.c:1430
0x6d41e9 c_parse_file()
        ../../gcc/gcc/c/c-parser.c:17914
0x736a12 c_common_parse_file()
        ../../gcc/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.


$ cat abc.c
extern ID ( ID ) extern ID [ __func__ ] ; { }