[Bug c++/60689] Bogus error with atomic::exchange

["redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset="UTF-8", Size: 3348 bytes --]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60689

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
when the object is bigger than the wordsize the generic __atomic_exchange gets
expanded incorrectly

$ g++11 aa.cc -DN=4 -m32
$ g++11 aa.cc -DN=5 -m32
aa.cc: In function ‘int main()’:
aa.cc:10:49: error: invalid conversion from ‘S*’ to ‘unsigned int’
[-fpermissive]
   __atomic_exchange(&a, &b, &c, __ATOMIC_SEQ_CST);
                                                 ^
aa.cc:10:49: error: invalid conversion from ‘int’ to ‘void*’ [-fpermissive]
aa.cc:10:49: error: too few arguments to function ‘void
__atomic_exchange(unsigned int, volatile void*, void*, void*, int)’
<built-in>: note: declared here
>From gcc-bugs-return-447669-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 27 20:47:48 2014
Return-Path: <gcc-bugs-return-447669-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Delivered-To: listarch-gcc-bugs@gcc.gnu.org
Received: (qmail 30071 invoked by alias); 27 Mar 2014 20:47:48 -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
Delivered-To: mailing list gcc-bugs@gcc.gnu.org
Received: (qmail 30033 invoked by uid 48); 27 Mar 2014 20:47:44 -0000
From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/60689] Bogus error with atomic::exchange
Date: Thu, 27 Mar 2014 20:47:00 -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:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: jakub at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: jakub at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields: bug_status cc assigned_to attachments.created
Message-ID: <bug-60689-4-TPT0PXCaqx@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-60689-4@http.gcc.gnu.org/bugzilla/>
References: <bug-60689-4@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: 2014-03/txt/msg02538.txt.bz2
Content-length: 794

http://gcc.gnu.org/bugzilla/show_bug.cgi?id`689

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |jakub at gcc dot gnu.org
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 32469
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id2469&actioníit
gcc49-pr60689.patch

Untested fix.  4.8 needs the same fix I think.
In any case, no idea where to put a test for this.  libstdc++-v3?  libatomic?
g++.dg and just make it compile test?