From owner-freebsd-bugs@FreeBSD.ORG  Fri Aug  1 19:46:30 2014
Return-Path: <owner-freebsd-bugs@FreeBSD.ORG>
Delivered-To: freebsd-bugs@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 568C5666
 for <freebsd-bugs@freebsd.org>; Fri,  1 Aug 2014 19:46:30 +0000 (UTC)
Received: from mail-qa0-x234.google.com (mail-qa0-x234.google.com
 [IPv6:2607:f8b0:400d:c00::234])
 (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits))
 (Client CN "smtp.gmail.com",
 Issuer "Google Internet Authority G2" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id 198812D45
 for <freebsd-bugs@freebsd.org>; Fri,  1 Aug 2014 19:46:30 +0000 (UTC)
Received: by mail-qa0-f52.google.com with SMTP id j15so4498790qaq.11
 for <freebsd-bugs@freebsd.org>; Fri, 01 Aug 2014 12:46:29 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:in-reply-to:references:date:message-id:subject:from:to
 :cc:content-type;
 bh=t8ZNBVHZhcvv6RqvTF3/ZBLPYBOBy1qCnj/0j0n1aqU=;
 b=tGGmuNxW9uqiCFkpAePixhtghlsxAuJZwCWrU3oWymYoz16jEs6NzmqnIyi68Blcgh
 Qs2T0Lyhaxn3Hz/pt240xFBmay4BwFExYguH9fV15xbCNEozr9j0Bm0oLEpHUJbg66o/
 8skenTszEAbYn1+KHOLAARJe7nr+xN6zZA9NjZoolRs3Olf7xJ1h21u3ZXKHfUq1iaUJ
 KBvjo5hj9/8oltmTxNS8VE3Iwzlb76qWkzQHcOUqcKp7CU2z2NKBADg6kM/+J8JaZXz7
 TVxTiLcYB0sU+OMZ5iQ/QyuYlkTVDV5dqXza5r5C05N11crC2nSCCz8pqZ1Dt5SLGPgS
 sLww==
MIME-Version: 1.0
X-Received: by 10.224.112.1 with SMTP id u1mr12440095qap.7.1406922389128; Fri,
 01 Aug 2014 12:46:29 -0700 (PDT)
Received: by 10.96.73.39 with HTTP; Fri, 1 Aug 2014 12:46:28 -0700 (PDT)
In-Reply-To: <CAMy2XzAAWcRR=7kNeajQNT9Q=+sxAh7JnWh-pTXsNyomdtBH+g@mail.gmail.com>
References: <CAMy2XzAAWcRR=7kNeajQNT9Q=+sxAh7JnWh-pTXsNyomdtBH+g@mail.gmail.com>
Date: Fri, 1 Aug 2014 12:46:28 -0700
Message-ID: <CALCpEUHS0eR14OSRRQbVsZgNto6BiJ4skJRONtbTo88mbM7Hmw@mail.gmail.com>
Subject: Re: thread_local broken on clang
From: hiren panchasara <hiren.panchasara@gmail.com>
To: Troy Heron <troy.heron@hixxy.org>
Content-Type: text/plain; charset=UTF-8
Cc: freebsd-bugs@freebsd.org
X-BeenThere: freebsd-bugs@freebsd.org
X-Mailman-Version: 2.1.18
Precedence: list
List-Id: Bug reports <freebsd-bugs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-bugs>,
 <mailto:freebsd-bugs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-bugs/>
List-Post: <mailto:freebsd-bugs@freebsd.org>
List-Help: <mailto:freebsd-bugs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
 <mailto:freebsd-bugs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 01 Aug 2014 19:46:30 -0000

On Thu, Jul 31, 2014 at 2:54 AM, Troy Heron <troy.heron@hixxy.org> wrote:
> Hello,
>
> I'm attempting to port an application to FreeBSD (version 10 to be
> specific). The application has been developed using C++11 and uses
> thread_local.
>
> As below, the use of thread_local is giving me linking errors for the C++
> ABI.
>
> troy@freebsd10:~ # cat tl.cpp
> #include <string>
>
> thread_local std::string test;
>
> int main()
> {
> }
> troy@freebsd10:~ # clang++ -std=c++11 tl.cpp -o tl
> /tmp/tl-7sN7Nb.o: In function `__cxx_global_var_init':
> tl.cpp:(.text+0xbb): undefined reference to `__cxa_thread_atexit'
> clang++: error: linker command failed with exit code 1 (use -v to see
> invocation)
> troy@freebsd10:~ #
>
> Has anyone else experienced this? Should I report it as a bug?

Please report a bug. You can also ask this question on freebsd-stable
mailing list.

cheers,
Hiren