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Subject: [Bug c++/98481] [10/11 Regression]
 std::vector<std::string>::size_type as return type gets tagged with abi:cxx11
Date: Mon, 11 Jan 2021 16:15:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98481

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:3dd0d3ee1d2a988e7f3a3e8f009fcf328f16d2ed

commit r11-6592-g3dd0d3ee1d2a988e7f3a3e8f009fcf328f16d2ed
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Thu Jan 7 17:47:18 2021 +0100

    c++, abi: Fix abi_tag attribute handling [PR98481]

    In GCC10 cp_walk_subtrees has been changed to walk template arguments.
    As the following testcase, that changed the mangling of some functions.
    I believe the previous behavior that find_abi_tags_r doesn't recurse in=
to
    template args has been the correct one, but setting *walk_subtrees =3D 0
    for the types and handling the types subtree walking manually in
    find_abi_tags_r looks too hard, there are a lot of subtrees and details
what
    should and shouldn't be walked, both in tree.c (walk_type_fields there,
    which is static) and in cp_walk_subtrees itself.

    The following patch abuses the fact that *walk_subtrees is an int to
    tell cp_walk_subtrees it shouldn't walk the template args.

    Co-authored-by: Jason Merrill <jason@redhat.com>

    gcc/cp/ChangeLog:

            PR c++/98481
            * class.c (find_abi_tags_r): Set *walk_subtrees to 2 instead of=
 1
            for types.
            (mark_abi_tags_r): Likewise.
            * decl2.c (min_vis_r): Likewise.
            * tree.c (cp_walk_subtrees): If *walk_subtrees_p is 2, look thr=
ough
            typedefs.

    gcc/testsuite/ChangeLog:

            PR c++/98481
            * g++.dg/abi/abi-tag24.C: New test.=