From owner-freebsd-current@FreeBSD.ORG  Wed Sep 24 15:29:37 2003
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 0C2CA16A4B3; Wed, 24 Sep 2003 15:29:37 -0700 (PDT)
Received: from canning.wemm.org (canning.wemm.org [192.203.228.65])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 834F844003; Wed, 24 Sep 2003 15:29:34 -0700 (PDT)
	(envelope-from peter@wemm.org)
Received: from wemm.org (localhost [127.0.0.1])
	by canning.wemm.org (Postfix) with ESMTP
	id 6C9362A7EA; Wed, 24 Sep 2003 15:29:34 -0700 (PDT)
	(envelope-from peter@wemm.org)
X-Mailer: exmh version 2.5 07/13/2001 with nmh-1.0.4
To: Robert Watson <rwatson@freebsd.org>
In-Reply-To: <Pine.NEB.3.96L.1030924091657.60986D-100000@fledge.watson.org> 
Date: Wed, 24 Sep 2003 15:29:34 -0700
From: Peter Wemm <peter@wemm.org>
Message-Id: <20030924222934.6C9362A7EA@canning.wemm.org>
cc: deischen@freebsd.org
cc: Doug Barton <DougB@freebsd.org>
cc: Freebsd Current <current@freebsd.org>
Subject: Re: Fixing -pthreads (Re: ports and -current) 
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 24 Sep 2003 22:29:37 -0000

Robert Watson wrote:

> Based on the results seen thus far, my preference would really be for:
> 
> (1) Keep -pthread, make it imply -lpthread, saving a lot of hassle.

Regarding the switch, the gcc folks have been adding -pthread as the
'standard' way to enable pthreads across the board for all platforms.
On some systems it also implies -D_REENTRANT and other flags as well.

-pthread cannot go away.  We'd just be hurting ourselves for no good reason,
especially when the rest of the world is syncing up with us.

Samples from http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog:

....
        * config/linux.h (LIB_SPEC): If -pthread, add -lpthread even if
        -shared.
        * config/alpha/linux-elf.h (LIB_SPEC): Likewise.
....
        * config/ia64/hpux.h: Define CPP_SPEC to set appropriate
        #defines for -pthread.  Add -lpthread to LIB_SPEC when
        -pthread.  In both cases take -mt as a synonym for -pthread
        for acc compatibility.
... 
	* config/netbsd.h: Update copyright years.
	(NETBSD_CPP_SPEC): Define _REENTRANT and _PTHREADS if
	-pthread is specified on the command line.
...


Cheers,
-Peter
--
Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com
"All of this is for nothing if we don't go to the stars" - JMS/B5