https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80145
Bug ID: 80145
Summary: [c++1y] ICE after failed return type deduction
Product: gcc
Version: unknown
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++1y)
triggers an ICE since GCC 4.8.0:
================================
auto* foo() { return 0; }
auto* foo();
================================
bug.cc: In function 'auto* foo()':
bug.cc:1:22: error: unable to deduce 'auto*' from '0'
auto* foo() { return 0; }
^
bug.cc:1:22: note: mismatched types 'auto*' and 'int'
bug.cc: At global scope:
bug.cc:2:11: internal compiler error: in merge_types, at cp/typeck.c:768
auto* foo();
^
0x75ae68 merge_types(tree_node*, tree_node*)
../../gcc/gcc/cp/typeck.c:768
0x75a2e5 merge_types(tree_node*, tree_node*)
../../gcc/gcc/cp/typeck.c:835
0x6236e8 duplicate_decls(tree_node*, tree_node*, bool)
../../gcc/gcc/cp/decl.c:2144
0x808108 pushdecl_maybe_friend_1
../../gcc/gcc/cp/name-lookup.c:835
0x808108 pushdecl_maybe_friend(tree_node*, bool)
../../gcc/gcc/cp/name-lookup.c:1352
0x6379c5 start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
../../gcc/gcc/cp/decl.c:5137
0x71c477 cp_parser_init_declarator
../../gcc/gcc/cp/parser.c:19251
0x740a9c cp_parser_simple_declaration
../../gcc/gcc/cp/parser.c:12773
0x741835 cp_parser_block_declaration
../../gcc/gcc/cp/parser.c:12598
0x746c44 cp_parser_declaration
../../gcc/gcc/cp/parser.c:12496
0x74886b cp_parser_declaration_seq_opt
../../gcc/gcc/cp/parser.c:12372
0x748b4a cp_parser_translation_unit
../../gcc/gcc/cp/parser.c:4366
0x748b4a c_parse_file()
../../gcc/gcc/cp/parser.c:38423
0x8a8ec3 c_common_parse_file()
../../gcc/gcc/c-family/c-opts.c:1107
Please submit a full bug report, [etc.]
