[Bug c++/78345] New: ice on invalid c++ code on x86_64-linux-gnu (internal compiler error: in cxx_eval_outermost_constant_expr, at cp/constexpr.c:4464)

["chengniansun at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78345

            Bug ID: 78345
           Summary: ice on invalid c++ code on x86_64-linux-gnu (internal
                    compiler error: in cxx_eval_outermost_constant_expr,
                    at cp/constexpr.c:4464)
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chengniansun at gmail dot com
  Target Milestone: ---

$ 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/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 7.0.0 20161110 (experimental) [trunk revision 242039] (GCC) 
$ 
$ gcc-trunk small.C
small.C: In lambda function:
small.C:3:11: error: expected ‘{’ before ‘;’ token
 } a[] =[] ;
           ^
small.C: At global scope:
small.C:3:3: error: initializer fails to determine size of ‘a’
 } a[] =[] ;
   ^
small.C:3:11: internal compiler error: in cxx_eval_outermost_constant_expr, at
cp/constexpr.c:4464
 } a[] =[] ;
           ^
0x8cc511 cxx_eval_outermost_constant_expr
        ../../gcc-source-trunk/gcc/cp/constexpr.c:4463
0x8cf751 maybe_constant_init(tree_node*, tree_node*)
        ../../gcc-source-trunk/gcc/cp/constexpr.c:4803
0x73d02a store_init_value(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
        ../../gcc-source-trunk/gcc/cp/typeck2.c:819
0x69397c check_initializer
        ../../gcc-source-trunk/gcc/cp/decl.c:6307
0x6bfbe9 cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        ../../gcc-source-trunk/gcc/cp/decl.c:6969
0x7c0a45 cp_parser_init_declarator
        ../../gcc-source-trunk/gcc/cp/parser.c:19070
0x7c12d9 cp_parser_simple_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:12656
0x7c1611 cp_parser_block_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:12524
0x7c86d0 cp_parser_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:12421
0x7c8ad4 cp_parser_declaration_seq_opt
        ../../gcc-source-trunk/gcc/cp/parser.c:12297
0x7c8e18 cp_parser_translation_unit
        ../../gcc-source-trunk/gcc/cp/parser.c:4360
0x7c8e18 c_parse_file()
        ../../gcc-source-trunk/gcc/cp/parser.c:37988
0x92e852 c_common_parse_file()
        ../../gcc-source-trunk/gcc/c-family/c-opts.c:1086
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 small.C
struct {
  const int i;
} a[] =[] ;
$