[Bug c++/114795] New: internal compiler error: in finish_member_declaration after module import in gcc 14.0.1 snapshot

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114795

            Bug ID: 114795
           Summary: internal compiler error: in finish_member_declaration
                    after module import in gcc 14.0.1 snapshot
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: porten at kde dot org
  Target Milestone: ---

This is with a gcc/g++ build created locally from the published snapshot
package gcc-14-20240414.tar.xz.

---------- compiler info ----------
$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/opt/gcc-14/libexec/gcc/x86_64-pc-linux-gnu/14.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /home/porten/tmp/gcc-14-20240414/configure --disable-multilib
--prefix=/opt/gcc-14 --enable-languages=c,c++
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.1 20240414 (experimental) (GCC)

---------- Command triggering the bug ----------

g++ -std=c++2a -fmodules-ts -c url.cpp queue.cpp

---------- url.cpp ----------

module;

#include <chrono>

export module url;

---------- queue.cpp ----------

import url;

#include <format>

---------- output -------------

In file included from /opt/gcc-14/include/c++/14.0.1/concepts:46,
                 from /opt/gcc-14/include/c++/14.0.1/compare:40,
                 from /opt/gcc-14/include/c++/14.0.1/array:38,
                 from /opt/gcc-14/include/c++/14.0.1/format:43,
                 from queue.cpp:3:
/opt/gcc-14/include/c++/14.0.1/type_traits:89:36: error: template definition of
non-template ‘constexpr const _Tp std::integral_constant<_Tp, __v>::value’
   89 |       static constexpr _Tp value = __v;
      |                                    ^~~
[ ... 7000 lines with compiler errors ... ]
/opt/gcc-14/include/c++/14.0.1/optional:265:30: internal compiler error: in
finish_member_declaration, at cp/semantics.cc:3840
  265 |       _Storage<_Stored_type> _M_payload;
      |                              ^~~~~~~~~~
0x7fa7e1 finish_member_declaration(tree_node*)
        /home/porten/tmp/gcc-14-20240414/gcc/cp/semantics.cc:3840
0xc28be5 cp_parser_member_declaration
        /home/porten/tmp/gcc-14-20240414/gcc/cp/parser.cc:28497
0xbeef63 cp_parser_member_specification_opt
        /home/porten/tmp/gcc-14-20240414/gcc/cp/parser.cc:27840
0xbeef63 cp_parser_class_specifier
        /home/porten/tmp/gcc-14-20240414/gcc/cp/parser.cc:26845
0xbeef63 cp_parser_type_specifier
        /home/porten/tmp/gcc-14-20240414/gcc/cp/parser.cc:20064
0xbf094d cp_parser_decl_specifier_seq
        /home/porten/tmp/gcc-14-20240414/gcc/cp/parser.cc:16590
0xc25cfa cp_parser_single_declaration
        /home/porten/tmp/gcc-14-20240414/gcc/cp/parser.cc:33143
0xc2619c cp_parser_template_declaration_after_parameters
        /home/porten/tmp/gcc-14-20240414/gcc/cp/parser.cc:32799
0xc26a80 cp_parser_explicit_template_declaration
        /home/porten/tmp/gcc-14-20240414/gcc/cp/parser.cc:33072
0xc2b599 cp_parser_declaration
        /home/porten/tmp/gcc-14-20240414/gcc/cp/parser.cc:15502
0xc29c99 cp_parser_toplevel_declaration
        /home/porten/tmp/gcc-14-20240414/gcc/cp/parser.cc:15594
0xc29c99 cp_parser_declaration_seq_opt
        /home/porten/tmp/gcc-14-20240414/gcc/cp/parser.cc:15345
0xc2a13b cp_parser_namespace_body
        /home/porten/tmp/gcc-14-20240414/gcc/cp/parser.cc:22128
0xc2a13b cp_parser_namespace_definition
        /home/porten/tmp/gcc-14-20240414/gcc/cp/parser.cc:22106
0xc2b896 cp_parser_declaration
        /home/porten/tmp/gcc-14-20240414/gcc/cp/parser.cc:15553
0xc2bf8a cp_parser_toplevel_declaration
        /home/porten/tmp/gcc-14-20240414/gcc/cp/parser.cc:15594
0xc2bf8a cp_parser_translation_unit
        /home/porten/tmp/gcc-14-20240414/gcc/cp/parser.cc:5279
0xc2bf8a c_parse_file()
        /home/porten/tmp/gcc-14-20240414/gcc/cp/parser.cc:51268
0xd7ae41 c_common_parse_file()
        /home/porten/tmp/gcc-14-20240414/gcc/c-family/c-opts.cc:1311
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.