[Bug c/113438] New: ICE (segfault) in dwarf2out_decl with -g -std=c23 on c23-tag-composite-2.c

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113438

            Bug ID: 113438
           Summary: ICE (segfault) in dwarf2out_decl with -g -std=c23 on
                    c23-tag-composite-2.c
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: acoplan at gcc dot gnu.org
  Target Milestone: ---

I did a testsuite run with -g on aarch64 and noticed the following ICE:

$ gcc/xgcc -B gcc -c
~/toolchain/src/gcc/gcc/testsuite/gcc.dg/c23-tag-composite-2.c -g -std=c23
/home/alecop01/toolchain/src/gcc/gcc/testsuite/gcc.dg/c23-tag-composite-2.c:15:21:
internal compiler error: Segmentation fault
   15 | void g(const struct foo { int x; } a);
      |                     ^~~
0xf15783 crash_signal
        /home/alecop01/toolchain/src/other_gcc/gcc/toplev.cc:317
0xa23f04 dwarf2out_decl
        /home/alecop01/toolchain/src/other_gcc/gcc/dwarf2out.cc:27611
0xa242c3 dwarf2out_type_decl
        /home/alecop01/toolchain/src/other_gcc/gcc/dwarf2out.cc:27405
0xa242c3 dwarf2out_type_decl
        /home/alecop01/toolchain/src/other_gcc/gcc/dwarf2out.cc:27400
0xde0d8b rest_of_type_compilation(tree_node*, int)
        /home/alecop01/toolchain/src/other_gcc/gcc/passes.cc:339
0x79ce17 finish_struct(unsigned int, tree_node*, tree_node*, tree_node*,
c_struct_parse_info*, tree_node**)
        /home/alecop01/toolchain/src/other_gcc/gcc/c/c-decl.cc:9733
0x7b29a7 composite_type_internal(tree_node*, tree_node*, composite_cache*)
        /home/alecop01/toolchain/src/other_gcc/gcc/c/c-typeck.cc:588
0x7b1867 composite_type_internal(tree_node*, tree_node*, composite_cache*)
        /home/alecop01/toolchain/src/other_gcc/gcc/c/c-typeck.cc:408
0x7b1867 composite_type_internal(tree_node*, tree_node*, composite_cache*)
        /home/alecop01/toolchain/src/other_gcc/gcc/c/c-typeck.cc:730
0x7b376f composite_type_internal(tree_node*, tree_node*, composite_cache*)
        /home/alecop01/toolchain/src/other_gcc/gcc/c/c-typeck.cc:408
0x7b376f composite_type(tree_node*, tree_node*)
        /home/alecop01/toolchain/src/other_gcc/gcc/c/c-typeck.cc:748
0x77c613 merge_decls
        /home/alecop01/toolchain/src/other_gcc/gcc/c/c-decl.cc:2798
0x77c613 duplicate_decls
        /home/alecop01/toolchain/src/other_gcc/gcc/c/c-decl.cc:3185
0x780347 pushdecl(tree_node*)
        /home/alecop01/toolchain/src/other_gcc/gcc/c/c-decl.cc:3374
0x798ba7 start_decl(c_declarator*, c_declspecs*, bool, tree_node*, bool,
unsigned int*)
        /home/alecop01/toolchain/src/other_gcc/gcc/c/c-decl.cc:5703
0x81bce3 c_parser_declaration_or_fndef
        /home/alecop01/toolchain/src/other_gcc/gcc/c/c-parser.cc:2766
0x82962f c_parser_external_declaration
        /home/alecop01/toolchain/src/other_gcc/gcc/c/c-parser.cc:2046
0x82a16f c_parser_translation_unit
        /home/alecop01/toolchain/src/other_gcc/gcc/c/c-parser.cc:1900
0x82a16f c_parse_file()
        /home/alecop01/toolchain/src/other_gcc/gcc/c/c-parser.cc:26815
0x8aa8df c_common_parse_file()
        /home/alecop01/toolchain/src/other_gcc/gcc/c-family/c-opts.cc:1301
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