From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-486818-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 52149 invoked by alias); 20 May 2015 14:47:02 -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 51873 invoked by uid 48); 20 May 2015 14:46:58 -0000
From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/66146] call_once not C++11-compliant on ppc64le
Date: Wed, 20 May 2015 14:47:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 5.1.0
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: redi at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution:
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields:
Message-ID: <bug-66146-4-BU5QtkakwQ@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-66146-4@http.gcc.gnu.org/bugzilla/>
References: <bug-66146-4@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: 2015-05/txt/msg01658.txt.bz2

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66146

--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #4)
> Thanks, Martin. So maybe something like this:
> 
> --- a/libstdc++-v3/include/std/mutex
> +++ b/libstdc++-v3/include/std/mutex
> @@ -726,7 +738,17 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
>        __set_once_functor_lock_ptr(&__functor_lock);
>  #endif
>  
> +#ifdef __powerpc__
> +      int __e;
> +      __try {
> +       __e = __gthread_once(&__once._M_once, &__once_proxy);
> +      } __catch(...) {
> +         __once._M_once = once_flag{}._M_once;

N.B. This won't work because it races, and may not even compile (if e.g.
pthread_once_t has a const member)