[Bug c++/84593] New: internal compiler error: Segmentation fault (non_type_check())

[vegard.nossum at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84593

            Bug ID: 84593
           Summary: internal compiler error: Segmentation fault
                    (non_type_check())
           Product: gcc
           Version: 8.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vegard.nossum at gmail dot com
  Target Milestone: ---

Input:

struct a {
  int x;
  int c = 0;
  int &b;
} c = {};

Output:

$ xgcc -x c++ -std=c++14 -O3 -c -
<stdin>:5:8: error: member 'a::b' is uninitialized reference
<stdin>:5:8: internal compiler error: Segmentation fault
0x3138779 crash_signal
        /home/vegard/git/gcc/gcc/toplev.c:325
0x1414ec4 non_type_check(tree_node*, char const*, int, char const*)
        /home/vegard/git/gcc/gcc/tree.h:3310
0x1414ec4 picflag_from_initializer
        /home/vegard/git/gcc/gcc/cp/typeck2.c:1230
0x141b813 process_init_constructor_record
        /home/vegard/git/gcc/gcc/cp/typeck2.c:1531
0x141b813 process_init_constructor
        /home/vegard/git/gcc/gcc/cp/typeck2.c:1712
0x141b813 digest_init_r
        /home/vegard/git/gcc/gcc/cp/typeck2.c:1147
0x14279ca digest_init_flags(tree_node*, tree_node*, int, int)
        /home/vegard/git/gcc/gcc/cp/typeck2.c:1192
0x14279ca store_init_value(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
        /home/vegard/git/gcc/gcc/cp/typeck2.c:814
0xb44f78 check_initializer
        /home/vegard/git/gcc/gcc/cp/decl.c:6380
0xbd8b3e cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        /home/vegard/git/gcc/gcc/cp/decl.c:7034
0xf9dd85 cp_parser_init_declarator
        /home/vegard/git/gcc/gcc/cp/parser.c:19665
0xfa2a97 cp_parser_simple_declaration
        /home/vegard/git/gcc/gcc/cp/parser.c:13009
0xfa8c88 cp_parser_block_declaration
        /home/vegard/git/gcc/gcc/cp/parser.c:12827
0xffb8d5 cp_parser_declaration
        /home/vegard/git/gcc/gcc/cp/parser.c:12724
0xff298b cp_parser_declaration_seq_opt
        /home/vegard/git/gcc/gcc/cp/parser.c:12600
0xff3fb3 cp_parser_translation_unit
        /home/vegard/git/gcc/gcc/cp/parser.c:4559
0xff3fb3 c_parse_file()
        /home/vegard/git/gcc/gcc/cp/parser.c:38820
0x15a0525 c_common_parse_file()
        /home/vegard/git/gcc/gcc/c-family/c-opts.c:1132
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

Version:

xgcc (GCC) 8.0.1 20180204 (experimental)

built from git fdae6180ad24fa6303fa046114f3e4b66b8db34d

Version 7.3.0 don't seem to be affected AFAICS. gcc trunk on godbolt.org (8.0.1
20180227) gives:

<source>:5:8: error: member 'a::b' is uninitialized reference
 } c = {};
        ^
<source>:5:8: internal compiler error: Segmentation fault
mmap: Invalid argument
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 1

Test case was reduced by C-Reduce.