From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-466873-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 18638 invoked by alias); 15 Nov 2014 15:59:57 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Received: (qmail 18584 invoked by uid 48); 15 Nov 2014 15:59:53 -0000
From: "fxcoudert at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/61053] [4.9/4.10 Regression] _Alignas(long long) reduces alignment of long long
Date: Sat, 15 Nov 2014 15:59:00 -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: 4.9.0
X-Bugzilla-Keywords: rejects-valid
X-Bugzilla-Severity: normal
X-Bugzilla-Who: fxcoudert at gcc dot gnu.org
X-Bugzilla-Status: REOPENED
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: mpolacek at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 4.9.1
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields: bug_status cc resolution
Message-ID: <bug-61053-4-ciwiS853Ms@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-61053-4@http.gcc.gnu.org/bugzilla/>
References: <bug-61053-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2014-11/txt/msg01345.txt.bz2

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61053

Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
                 CC|                            |fxcoudert at gcc dot gnu.org,
                   |                            |iains at gcc dot gnu.org,
                   |                            |mikestump at comcast dot net
         Resolution|FIXED                       |---

--- Comment #8 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
The testcase introduced in fixing this bug (gcc.dg/pr61053.c) fails on
x86_64-apple-darwin14 with -m32, because of excess errors:

gcc.dg/pr61053.c:70:28: error: '_Alignas' specifiers cannot reduce alignment of
'ldi'
gcc.dg/pr61053.c:71:33: error: '_Alignas' specifiers cannot reduce alignment of
'ldl'
gcc.dg/pr61053.c:72:38: error: '_Alignas' specifiers cannot reduce alignment of
'ldll'
gcc.dg/pr61053.c:73:30: error: '_Alignas' specifiers cannot reduce alignment of
'ldf'
gcc.dg/pr61053.c:74:31: error: '_Alignas' specifiers cannot reduce alignment of
'ldd'

The testcase does not expect those for ia32, but we have them on darwin because
long double has 16 bytes alignment both at -m32 and -m64.
I don't know what's the best way to adapt the dg-error clauses, however.