[Bug c++/81054] New: [7/8 Regression] ICE with volatile variable in constexpr function

["reichelt at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81054

            Bug ID: 81054
           Summary: [7/8 Regression] ICE with volatile variable in
                    constexpr function
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Keywords: error-recovery, ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: reichelt at gcc dot gnu.org
  Target Milestone: ---

The following invalid code snippet (compiled with -std=c++1z) triggers
an ICE since GCC 7.1.0:

==================================
struct A
{
  volatile int i;
  constexpr A() : i() {}
};

struct B
{
  static constexpr A a {};
};
==================================

bug.cc:9:25: error: the type 'const A' of constexpr variable 'B::a' is not
literal
   static constexpr A a {};
                         ^
bug.cc:1:8: note: 'A' is not literal because:
 struct A
        ^
bug.cc:3:16: note:   non-static data member 'A::i' has volatile type
   volatile int i;
                ^
bug.cc:9:22: error: in-class initialization of static data member 'const A
B::a' of non-literal type
   static constexpr A a {};
                      ^
bug.cc:9:25: internal compiler error: in make_rtl_for_nonlocal_decl, at
cp/decl.c:6427
   static constexpr A a {};
                         ^
0x684049 make_rtl_for_nonlocal_decl
        ../../gcc/gcc/cp/decl.c:6425
0x6abdda cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        ../../gcc/gcc/cp/decl.c:7092
0x6ca9ee grokfield(cp_declarator const*, cp_decl_specifier_seq*, tree_node*,
bool, tree_node*, tree_node*)
        ../../gcc/gcc/cp/decl2.c:956
0x752dbd cp_parser_member_declaration
        ../../gcc/gcc/cp/parser.c:23421
0x753a3a cp_parser_member_specification_opt
        ../../gcc/gcc/cp/parser.c:22958
0x753a3a cp_parser_class_specifier_1
        ../../gcc/gcc/cp/parser.c:22111
0x755f31 cp_parser_class_specifier
        ../../gcc/gcc/cp/parser.c:22363
0x755f31 cp_parser_type_specifier
        ../../gcc/gcc/cp/parser.c:16449
0x768e21 cp_parser_decl_specifier_seq
        ../../gcc/gcc/cp/parser.c:13353
0x770e01 cp_parser_simple_declaration
        ../../gcc/gcc/cp/parser.c:12678
0x771cf5 cp_parser_block_declaration
        ../../gcc/gcc/cp/parser.c:12625
0x744584 cp_parser_declaration
        ../../gcc/gcc/cp/parser.c:12523
0x779b2b cp_parser_declaration_seq_opt
        ../../gcc/gcc/cp/parser.c:12399
0x779e0a cp_parser_translation_unit
        ../../gcc/gcc/cp/parser.c:4364
0x779e0a c_parse_file()
        ../../gcc/gcc/cp/parser.c:38475
0x8ba5b6 c_common_parse_file()
        ../../gcc/gcc/c-family/c-opts.c:1104
Please submit a full bug report, [etc.]