[Bug c++/78897] New: ICE: in output_constructor_regular_field, at varasm.c:5019

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78897

            Bug ID: 78897
           Summary: ICE: in output_constructor_regular_field, at
                    varasm.c:5019
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
  Target Milestone: ---

markus@x4 /tmp % cat const.ii
struct Optional {
  constexpr Optional() : _dummy{} { _value = 1; }
  union {
    int _dummy;
    int _value;
  };
};
Optional opt{};

markus@x4 /tmp % clang++ -std=c++14 -c const.ii
markus@x4 /tmp % icpc -std=c++14 -c const.ii
markus@x4 /tmp % g++ -c const.ii
const.ii:8:15: internal compiler error: in output_constructor_regular_field, at
varasm.c:5019
 Optional opt{};
               ^
0x104e345 output_constructor_regular_field
        /home/markus/gcc/gcc/varasm.c:5019
0x104e345 output_constructor
        /home/markus/gcc/gcc/varasm.c:5327
0x104d2aa output_constant
        /home/markus/gcc/gcc/varasm.c:4704
0x104d2aa output_constructor_regular_field
        /home/markus/gcc/gcc/varasm.c:5057
0x104d2aa output_constructor
        /home/markus/gcc/gcc/varasm.c:5327
0x104f4d1 output_constant
        /home/markus/gcc/gcc/varasm.c:4704
0x104f4d1 assemble_variable_contents
        /home/markus/gcc/gcc/varasm.c:2083
0x10561ef assemble_variable(tree_node*, int, int, int)
        /home/markus/gcc/gcc/varasm.c:2259
0x105ba21 varpool_node::assemble_decl()
        /home/markus/gcc/gcc/varpool.c:588
0x96311c output_in_order
        /home/markus/gcc/gcc/cgraphunit.c:2248
0x963523 symbol_table::compile()
        /home/markus/gcc/gcc/cgraphunit.c:2488
0x965ed6 symbol_table::compile()
        /home/markus/gcc/gcc/cgraphunit.c:2587
0x965ed6 symbol_table::finalize_compilation_unit()
        /home/markus/gcc/gcc/cgraphunit.c:2584