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To: gdb-prs@sourceware.org
Subject: [Bug build/31281] [gdb] intrusive_list.h:329: internal-error:
 push_back: Assertion elem_node->prev == INTRUSIVE_LIST_UNLINKED_VALUE failed.
Date: Thu, 25 Jan 2024 15:30:35 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31281

--- Comment #16 from Sourceware Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom de Vries <vries@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dbinutils-gdb.git;h=3D2ec7980408fa=
fb172d2ddb716a367ce2111e2e9e

commit 2ec7980408fafb172d2ddb716a367ce2111e2e9e
Author: Tom de Vries <tdevries@suse.de>
Date:   Thu Jan 25 16:31:47 2024 +0100

    [gdb/build] Workaround gcc PR113599

    Since gcc commit d3f48f68227 ("c++: non-dependent .* operand folding
    [PR112427]"), with gdb we run into PR gcc/113599 [1], a wrong-code bug,=
 as
    reported in PR build/31281.

    Work around this by flipping inherit order:
    ...
    -class thread_info : public refcounted_object,
    -                   public intrusive_list_node<thread_info>
    +class thread_info : public intrusive_list_node<thread_info>,
    +                   public refcounted_object
    ...

    An argument could be made that this isn't necessary, because this occur=
red
in
    an unreleased gcc version.

    However, I think it could be useful when bisecting gcc for other proble=
ms
in
    building gdb.  Having this workaround means the bisect won't reintroduce
the
    problem.  Furthermore, the workaround is harmless.

    Tested on Fedora rawhide x86_64.

    Approved-By: Tom Tromey <tom@tromey.com>

    Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=3D31281

    [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113599

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