[Bug c++/80207] New: ICE on invalid code in comptypes at cp/typeck.c:1434

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80207

            Bug ID: 80207
           Summary: ICE on invalid code in comptypes at cp/typeck.c:1434
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-linux-gnu
            Target: arm-linux-gnueabi

Created attachment 41055
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41055&action=edit
test-case

Following llvm test-case ICEs on trunk:

$ arm-linux-gnueabi-g++ ~/Downloads/cxx0x-defaulted-functions.cpp -mflip-thumb
/home/marxin/BIG/Programming/llvm-project/llvm/tools/clang/test/SemaCXX/cxx0x-defaulted-functions.cpp:3:13:
error: ‘void fn()’ cannot be defaulted
 void fn() = default; // expected-error {{only special member}}
             ^~~~~~~
/home/marxin/BIG/Programming/llvm-project/llvm/tools/clang/test/SemaCXX/cxx0x-defaulted-functions.cpp:5:15:
error: ‘void foo::fn()’ cannot be defaulted
   void fn() = default; // expected-error {{only special member}}
               ^~~~~~~
/home/marxin/BIG/Programming/llvm-project/llvm/tools/clang/test/SemaCXX/cxx0x-defaulted-functions.cpp:29:11:
internal compiler error: canonical types differ for identical types void*
(bar::)(int) noexcept (<uninstantiated>) and void* (bar::)(int) noexcept
(<uninstantiated>)
 bar::~bar() = default;
           ^
0x75f7df comptypes(tree_node*, tree_node*, int)
        .././../gcc/cp/typeck.c:1434
0x62d426 duplicate_decls(tree_node*, tree_node*, bool)
        .././../gcc/cp/decl.c:2195
0x5c1e0c grokfndecl
        .././../gcc/cp/decl.c:8927
0x641938 grokdeclarator(cp_declarator const*, cp_decl_specifier_seq*,
decl_context, int, tree_node**)
        .././../gcc/cp/decl.c:12223
0x643266 start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
        .././../gcc/cp/decl.c:4964
0x7446c9 cp_parser_init_declarator
        .././../gcc/cp/parser.c:19251
0x7453af cp_parser_simple_declaration
        .././../gcc/cp/parser.c:12773
0x74610a cp_parser_block_declaration
        .././../gcc/cp/parser.c:12599
0x74e05e cp_parser_declaration
        .././../gcc/cp/parser.c:12496
0x74e4b6 cp_parser_declaration_seq_opt
        .././../gcc/cp/parser.c:12372
0x74e7e8 cp_parser_translation_unit
        .././../gcc/cp/parser.c:4366
0x74e7e8 c_parse_file()
        .././../gcc/cp/parser.c:38423
0x8b2d52 c_common_parse_file()
        .././../gcc/c-family/c-opts.c:1107