From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 5E1D13882673; Tue,  2 May 2023 20:13:44 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 5E1D13882673
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1683058424;
	bh=mJxN+EWZjl2SD9eNTYR9jw0q94AP+/PA24pqghpqFY8=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=cBINS2QaFwq6l8BPTTzHFfaVl4zmmsKm3Cu+hDkhnEX0Eu6CPcFyyir0EO0oHOQXN
	 IOZ0ZlKyw2uLtLJC4PXLTliLeKXC+vv0+TntQY0eSovMtzLkcSibmziOJbZHZ+ZiXL
	 mKXIXgJHQpgDBn2irEvdh36O7S8kXoupDCirQSog=
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/53932] [10/11 Regression] C++ reference variable to member
 of anonymous union in global is error
Date: Tue, 02 May 2023 20:13:43 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 4.3.4
X-Bugzilla-Keywords: ice-on-valid-code, link-failure, wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: cvs-commit at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: jakub at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 10.5
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-53932-4-uaR6XawTWR@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-53932-4@http.gcc.gnu.org/bugzilla/>
References: <bug-53932-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D53932

--- Comment #15 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:bd34d694f4c060c92aee0e09edf4c7e1d83807e5

commit r11-10700-gbd34d694f4c060c92aee0e09edf4c7e1d83807e5
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Thu Jan 19 23:27:34 2023 +0100

    c++: Fix up handling of references to anon union members in initializers
[PR53932]

    For anonymous union members we create artificial VAR_DECLs which
    have DECL_VALUE_EXPR for the actual COMPONENT_REF.  That works
    just fine inside of functions (including global dynamic constructors),
    because during gimplification such VAR_DECLs are gimplified as
    their DECL_VALUE_EXPR.  This is also done during regimplification.

    But references to these artificial vars in DECL_INITIAL expressions
    aren't ever replaced by the DECL_VALUE_EXPRs, so we end up either
    with link failures like on the testcase below, or worse ICEs with
    LTO.

    The following patch fixes those during cp_fully_fold_init where we
    already walk all the trees (!data->genericize means that
    function rather than cp_fold_function).

    2023-01-19  Jakub Jelinek  <jakub@redhat.com>

            PR c++/53932
            * cp-gimplify.c (cp_fold_r): During cp_fully_fold_init replace
            DECL_ANON_UNION_VAR_P VAR_DECLs with their corresponding
            DECL_VALUE_EXPR.

            * g++.dg/init/pr53932.C: New test.

    (cherry picked from commit 9b9a989adc042b304572fd6d4ade46b47be6ccb8)=