[Bug ipa/87957] New: [9 Regression] ICE tree check: expected tree that contains ‘decl minimal’ structure, have ‘identifier_node’ in warn_odr, at ipa-devirt.c:1051 since r265519

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87957

            Bug ID: 87957
           Summary: [9 Regression] ICE tree check: expected tree that
                    contains ‘decl minimal’ structure, have
                    ‘identifier_node’ in warn_odr, at ipa-devirt.c:1051
                    since r265519
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: hubicka at gcc dot gnu.org, marxin at gcc dot gnu.org
  Target Milestone: ---

Following is causing a new ICE:

$ cat 1.ii
typedef struct {
  int a;
} YYSTYPE;
union yyalloc {
  short yyss;
  YYSTYPE yyvs;
};
void b() { yyalloc c; }

$ cat 2.ii
typedef struct YYSTYPE {
} YYSTYPE;
union yyalloc {
  short yyss;
  YYSTYPE yyvs;
};
void a() { yyalloc b; }

$ g++ -flto [12].ii
1.ii:3:3: warning: type ‘struct YYSTYPE’ violates the C++ One Definition Rule
[-Wodr]
    3 | } YYSTYPE;
      |   ^
lto1: internal compiler error: tree check: expected tree that contains ‘decl
minimal’ structure, have ‘identifier_node’ in warn_odr, at ipa-devirt.c:1051
0x6b540e tree_contains_struct_check_failed(tree_node const*,
tree_node_structure_enum, char const*, int, char const*)
        ../../gcc/tree.c:9790
0x614bd4 contains_struct_check(tree_node*, tree_node_structure_enum, char
const*, int, char const*)
        ../../gcc/tree.h:3268
0x614bd4 warn_odr
        ../../gcc/ipa-devirt.c:1051
0xa01c9e type_variants_equivalent_p
        ../../gcc/ipa-devirt.c:651
0xa07f68 odr_subtypes_equivalent_p
        ../../gcc/ipa-devirt.c:697
0xa08faa odr_types_equivalent_p
        ../../gcc/ipa-devirt.c:1576
0xa05ea4 add_type_duplicate
        ../../gcc/ipa-devirt.c:1878
0xa05ea4 get_odr_type(tree_node*, bool)
        ../../gcc/ipa-devirt.c:2058
0x7894d6 lto_read_decls
        ../../gcc/lto/lto.c:1900
0x78a78e lto_file_finalize
        ../../gcc/lto/lto.c:2134
0x78a78e lto_create_files_from_ids
        ../../gcc/lto/lto.c:2144
0x78a78e lto_file_read
        ../../gcc/lto/lto.c:2185
0x78a78e read_cgraph_and_symbols
        ../../gcc/lto/lto.c:2865
0x78a78e lto_main()
        ../../gcc/lto/lto.c:3401