https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89933
Bug ID: 89933
Summary: [7/8/9 Regression] ICE in merge_decls, at
c/c-decl.c:2517
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: gs...@t-online.de
Target Milestone: ---
Doubled line affects versions 7 up to trunk.
gcc-6 rejects it with an error.
clang7 and icc19 accepts it without any warning/error.
$ cat z1.c
typedef unsigned int a __attribute__ ((__aligned__(8), __may_alias__));
typedef unsigned int a __attribute__ ((__aligned__(8), __may_alias__));
$ gcc-9-20190331 -c z1.c
z1.c:2:1: internal compiler error: Segmentation fault
2 | typedef unsigned int a __attribute__ ((__aligned__(8), __may_alias__));
| ^~~~~~~
0xa748df crash_signal
../../gcc/toplev.c:326
0x5c9023 merge_decls
../../gcc/c/c-decl.c:2517
0x5c9023 duplicate_decls
../../gcc/c/c-decl.c:2886
0x5cb067 pushdecl(tree_node*)
../../gcc/c/c-decl.c:3072
0x5db56d start_decl(c_declarator*, c_declspecs*, bool, tree_node*)
../../gcc/c/c-decl.c:5016
0x61d983 c_parser_declaration_or_fndef
../../gcc/c/c-parser.c:2154
0x623a53 c_parser_external_declaration
../../gcc/c/c-parser.c:1653
0x624519 c_parser_translation_unit
../../gcc/c/c-parser.c:1534
0x624519 c_parse_file()
../../gcc/c/c-parser.c:19854
0x66ba20 c_common_parse_file()
../../gcc/c-family/c-opts.c:1156
