[Bug c++/99239] New: [modules] internal compiler error: in duplicate_decls

[Bug c++/99239] New: [modules] internal compiler error: in duplicate_decls

[alexander.lelyakin at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99239

            Bug ID: 99239
           Summary: [modules] internal compiler error: in duplicate_decls
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: alexander.lelyakin at googlemail dot com
  Target Milestone: ---

g++ -std=c++20 -fmodules-ts -x c++-system-header cstdio
g++ -std=c++20 -fmodules-ts -x c++-system-header string
g++ -std=c++20 -fmodules-ts -x c++-system-header filesystem
-----
In file included from /usr/local/include/c++/11.0.0/bits/functexcept.h:40,
                 from /usr/local/include/c++/11.0.0/bits/stl_algobase.h:60,
                 from /usr/local/include/c++/11.0.0/bits/char_traits.h:39,
                 from /usr/local/include/c++/11.0.0/string:40,
of module /usr/local/include/c++/11.0.0/string, imported at
/usr/local/include/c++/11.0.0/stdexcept:39,
        included from /usr/local/include/c++/11.0.0/system_error:41,
                 from /usr/local/include/c++/11.0.0/bits/fs_fwd.h:35,
                 from /usr/local/include/c++/11.0.0/filesystem:44:
/usr/local/include/c++/11.0.0/bits/locale_classes.h:461:11: internal compiler
error: in duplicate_decls, at cp/decl.c:2023
  461 |           __catch(...)
      |           ^~~~~~~
0x6b37fc duplicate_decls(tree_node*, tree_node*, bool, bool)
        ../../gcc/gcc/cp/decl.c:2023
0xa83ceb check_module_override
        ../../gcc/gcc/cp/name-lookup.c:3615
0xa83ceb do_pushdecl
        ../../gcc/gcc/cp/name-lookup.c:3734
0xa848d1 do_pushdecl
        ../../gcc/gcc/cp/name-lookup.c:4851
0xa848d1 do_pushdecl_with_scope
        ../../gcc/gcc/cp/name-lookup.c:4851
0xa84b02 pushdecl_namespace_level(tree_node*, bool)
        ../../gcc/gcc/cp/name-lookup.c:6213
0xa85bf4 pushdecl_top_level(tree_node*)
        ../../gcc/gcc/cp/name-lookup.c:8675
0xa072b2 declare_library_fn
        ../../gcc/gcc/cp/except.c:172
0xa07e9d do_end_catch
        ../../gcc/gcc/cp/except.c:254
0xa07e9d push_eh_cleanup
        ../../gcc/gcc/cp/except.c:270
0xa07e9d expand_start_catch_block(tree_node*)
        ../../gcc/gcc/cp/except.c:408
0xb42764 finish_handler_parms(tree_node*, tree_node*)
        ../../gcc/gcc/cp/semantics.c:1526
0xac95a3 cp_parser_handler
        ../../gcc/gcc/cp/parser.c:27094
0xaa9bd7 cp_parser_handler_seq
        ../../gcc/gcc/cp/parser.c:27069
0xaa9bd7 cp_parser_try_block
        ../../gcc/gcc/cp/parser.c:27023
0xaa9bd7 cp_parser_statement
        ../../gcc/gcc/cp/parser.c:11654
0xaaaf3d cp_parser_statement_seq_opt
        ../../gcc/gcc/cp/parser.c:12112
0xaab018 cp_parser_compound_statement
        ../../gcc/gcc/cp/parser.c:12062
0xacaf9d cp_parser_implicitly_scoped_statement
        ../../gcc/gcc/cp/parser.c:13568
0xaaa65d cp_parser_selection_statement
        ../../gcc/gcc/cp/parser.c:12290
----
g++ (GCC) 11.0.0 20210223 (experimental)

[Bug c++/99239] [modules] internal compiler error: in duplicate_decls

[alexander.lelyakin at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99239

--- Comment #1 from Alexander Lelyakin <alexander.lelyakin at googlemail dot com> ---
About half of sequences of headers producing segmentation fault are stopped on
<stop_token>.
However there are another variants:
----
g++ -std=c++20 -fmodules-ts -x c++-system-header stdexcept
g++ -std=c++20 -fmodules-ts -x c++-system-header locale
----
/usr/local/include/c++/11.0.1/locale: internal compiler error: Segmentation
fault
0x10fee8f crash_signal
        ../../gcc/gcc/toplev.c:327
0x6deab8 trees_out::get_tag(tree_node*)
        ../../gcc/gcc/cp/module.cc:4783
0x6deab8 trees_out::ref_node(tree_node*)
        ../../gcc/gcc/cp/module.cc:7090
0x6deab8 trees_out::ref_node(tree_node*)
        ../../gcc/gcc/cp/module.cc:7073
0xa5dfdc trees_out::tree_node(tree_node*)
        ../../gcc/gcc/cp/module.cc:8978
0xa5fec9 trees_out::type_node(tree_node*)
        ../../gcc/gcc/cp/module.cc:8701
0xa5e3da trees_out::tree_node(tree_node*)
        ../../gcc/gcc/cp/module.cc:9061
0xa5fccc trees_out::type_node(tree_node*)
        ../../gcc/gcc/cp/module.cc:8619
0xa5e3da trees_out::tree_node(tree_node*)
        ../../gcc/gcc/cp/module.cc:9061
0xa60104 trees_out::type_node(tree_node*)
        ../../gcc/gcc/cp/module.cc:8728
0xa5e3da trees_out::tree_node(tree_node*)
        ../../gcc/gcc/cp/module.cc:9061
0xa5ed0f trees_out::core_vals(tree_node*)
        ../../gcc/gcc/cp/module.cc:5993
0xa5fbec trees_out::tree_node_vals(tree_node*)
        ../../gcc/gcc/cp/module.cc:7053
0xa5fbec trees_out::fn_parms_init(tree_node*)
        ../../gcc/gcc/cp/module.cc:9992
0xa5c4c4 trees_out::decl_value(tree_node*, depset*)
        ../../gcc/gcc/cp/module.cc:7625
0xa63fd1 depset::hash::find_dependencies(module_state*)
        ../../gcc/gcc/cp/module.cc:13169
0xa64668 module_state::write(elf_out*, cpp_reader*)
        ../../gcc/gcc/cp/module.cc:17644
0xa65aff finish_module_processing(cpp_reader*)
        ../../gcc/gcc/cp/module.cc:19884
0x9f901b c_parse_final_cleanups()
        ../../gcc/gcc/cp/decl2.c:5175
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
----
g++ (GCC) 11.0.1 20210308 (experimental)
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[Bug c++/99239] [modules] internal compiler error: in duplicate_decls

[alexander.lelyakin at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99239

--- Comment #2 from Alexander Lelyakin <alexander.lelyakin at googlemail dot com> ---
(In reply to Alexander Lelyakin from comment #1)
> About half of sequences of headers producing segmentation fault are stopped
> on <stop_token>.
> However there are another variants:
> ----
> g++ -std=c++20 -fmodules-ts -x c++-system-header stdexcept
> g++ -std=c++20 -fmodules-ts -x c++-system-header locale

Sorry this was for another bug

[Bug c++/99239] [modules] internal compiler error: in duplicate_decls

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99239

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Nathan Sidwell <nathan@gcc.gnu.org>:

https://gcc.gnu.org/g:6acd6692f1ac3c2ece3da36178df73e3b12c4f65

commit r11-7785-g6acd6692f1ac3c2ece3da36178df73e3b12c4f65
Author: Nathan Sidwell <nathan@acm.org>
Date:   Tue Mar 23 05:18:04 2021 -0700

    c++: Over-zealous assert [PR 99239]

    This was simply an overzealous assert.  Possibly correct thinking at
    the time that code was written, but not true now.  Of course we can
    have imported artificial decls.

            PR c++/99239
            gcc/cp/
            * decl.c (duplicate_decls): Remove assert about maybe-imported
            artificial decls.
            gcc/testsuite/
            * g++.dg/modules/pr99239_a.H: New.
            * g++.dg/modules/pr99239_b.H: New.

[Bug c++/99239] [modules] internal compiler error: in duplicate_decls

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99239

Nathan Sidwell <nathan at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
* 6acd6692f1a 2021-03-23 | c++: Over-zealous assert [PR 99239]