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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/108474] static structured binding undefined reference
Date: Tue, 24 Jan 2023 10:32:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108474

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

https://gcc.gnu.org/g:b84e21115700523b4d0ac44275443f7b9c670344

commit r13-5323-gb84e21115700523b4d0ac44275443f7b9c670344
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Jan 24 11:28:00 2023 +0100

    c++: Handle structured bindings like anon unions in initializers [PR108=
474]

    As reported by Andrew Pinski, structured bindings (with the exception
    of the ones using std::tuple_{size,element} and get which are really
    standalone variables in addition to the binding one) also use
    DECL_VALUE_EXPR and needs the same treatment in static initializers.

    On Sun, Jan 22, 2023 at 07:19:07PM -0500, Jason Merrill wrote:
    > Though, actually, why not instead fix expand_expr_real_1 (and staticp=
) to
    > look through DECL_VALUE_EXPR?

    Doing it when emitting the initializers seems to be too late to me,
    we in various spots try to put parts of the static var DECL_INITIAL
expressions
    into the IL, or e.g. for varpool purposes remember which vars are
referenced
    there.

    This patch moves it to record_reference, which is called from
varpool_node::analyze
    and so about the same time as gimplification of the bodies which also
    replaces DECL_VALUE_EXPRs.

    2023-01-24  Jakub Jelinek  <jakub@redhat.com>

            PR c++/108474
            * cgraphbuild.cc: Include gimplify.h.
            (record_reference): Replace VAR_DECLs with DECL_HAS_VALUE_EXPR_P
with
            their corresponding DECL_VALUE_EXPR expressions after unsharing.

            * cp-gimplify.cc (cp_fold_r): Revert 2023-01-19 changes.

            * g++.dg/cpp1z/decomp57.C: New test.
            * g++.dg/cpp1z/decomp58.C: New test.=