[Bug c++/77626] New: ICE with -Wall on x86_64-linux-gnu (internal compiler error: Segmentation fault, byte_from_pos, cxx_fold_indirect_ref)

[chengniansun at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77626

            Bug ID: 77626
           Summary: ICE with -Wall on x86_64-linux-gnu (internal compiler
                    error: Segmentation fault, byte_from_pos,
                    cxx_fold_indirect_ref)
           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: ---

$ g++-trunk -v
Using built-in specs.
COLLECT_GCC=g++-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 20160916 (experimental) [trunk revision 240207] (GCC) 
$ 
$ g++-trunk -Wall small.C 
small.C:2:18: error: field ‘aligned’ has incomplete type ‘struct2’
   struct struct2 aligned;
                  ^~~~~~~
small.C:2:10: note: forward declaration of ‘struct struct2’
   struct struct2 aligned;
          ^~~~~~~
small.C: In function ‘void fn1(int)’:
small.C:6:15: internal compiler error: Segmentation fault
   fn1((int &)a);
               ^
0xdc7baf crash_signal
        ../../gcc-source-trunk/gcc/toplev.c:336
0xdb6a3c byte_from_pos(tree_node*, tree_node*)
        ../../gcc-source-trunk/gcc/stor-layout.c:862
0x895eac cxx_fold_indirect_ref
        ../../gcc-source-trunk/gcc/cp/constexpr.c:2897
0x89e8f0 cxx_eval_indirect_ref
        ../../gcc-source-trunk/gcc/cp/constexpr.c:3029
0x89e8f0 cxx_eval_constant_expression
        ../../gcc-source-trunk/gcc/cp/constexpr.c:3903
0x8a46df cxx_eval_outermost_constant_expr
        ../../gcc-source-trunk/gcc/cp/constexpr.c:4382
0x8a79cc maybe_constant_value_1
        ../../gcc-source-trunk/gcc/cp/constexpr.c:4576
0x8a79cc maybe_constant_value(tree_node*, tree_node*)
        ../../gcc-source-trunk/gcc/cp/constexpr.c:4600
0x65704a build_over_call
        ../../gcc-source-trunk/gcc/cp/call.c:7766
0x662c4f build_new_function_call(tree_node*, vec<tree_node*, va_gc,
vl_embed>**, bool, int)
        ../../gcc-source-trunk/gcc/cp/call.c:4190
0x8062d8 finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool,
bool, int)
        ../../gcc-source-trunk/gcc/cp/semantics.c:2440
0x77d54b cp_parser_postfix_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:6937
0x77b972 cp_parser_unary_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:8019
0x785877 cp_parser_cast_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:8696
0x785e43 cp_parser_binary_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:8798
0x786733 cp_parser_assignment_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:9086
0x789069 cp_parser_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:9253
0x78968f cp_parser_expression_statement
        ../../gcc-source-trunk/gcc/cp/parser.c:10736
0x797f3a cp_parser_statement
        ../../gcc-source-trunk/gcc/cp/parser.c:10587
0x798e35 cp_parser_statement_seq_opt
        ../../gcc-source-trunk/gcc/cp/parser.c:10859
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.
$ 
$ g++-trunk small.C
small.C:2:18: error: field ‘aligned’ has incomplete type ‘struct2’
   struct struct2 aligned;
                  ^~~~~~~
small.C:2:10: note: forward declaration of ‘struct struct2’
   struct struct2 aligned;
          ^~~~~~~
$ 
$ cat small.C
struct A {
  struct struct2 aligned;
};
void fn1(int) {
  A a;
  fn1((int &)a);
}