From owner-freebsd-questions@FreeBSD.ORG  Sat Jun 16 16:17:23 2012
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 04A16106566B;
	Sat, 16 Jun 2012 16:17:23 +0000 (UTC)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from wojtek.tensor.gdynia.pl (wojtek.tensor.gdynia.pl [89.206.35.99])
	by mx1.freebsd.org (Postfix) with ESMTP id 6E06D8FC15;
	Sat, 16 Jun 2012 16:17:22 +0000 (UTC)
Received: from wojtek.tensor.gdynia.pl (localhost [127.0.0.1])
	by wojtek.tensor.gdynia.pl (8.14.5/8.14.5) with ESMTP id q5GGHJna041421;
	Sat, 16 Jun 2012 18:17:19 +0200 (CEST)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from localhost (wojtek@localhost)
	by wojtek.tensor.gdynia.pl (8.14.5/8.14.5/Submit) with ESMTP id
	q5GGHJeA041418; Sat, 16 Jun 2012 18:17:19 +0200 (CEST)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Date: Sat, 16 Jun 2012 18:17:19 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Matthew Seaman <matthew@freebsd.org>
In-Reply-To: <4FCF9C07.2000607@FreeBSD.org>
Message-ID: <alpine.BSF.2.00.1206161815550.41364@wojtek.tensor.gdynia.pl>
References: <4FCF9333.70201@speakeasy.org> <4FCF9C07.2000607@FreeBSD.org>
User-Agent: Alpine 2.00 (BSF 1167 2008-08-23)
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII
X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7
	(wojtek.tensor.gdynia.pl [127.0.0.1]);
	Sat, 16 Jun 2012 18:17:20 +0200 (CEST)
Cc: freebsd-questions@freebsd.org
Subject: Re: Why Clang
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 16 Jun 2012 16:17:23 -0000

>
> Clearly an update was necessary.  Unfortunately, later versions of gcc
> have switched to GPLv3, which is a viral license and unacceptable to the
> FreeBSD project.

wasn't aware of that.

>
> Therefore clang was chosen from amongst a number of alternatives as the
> best replacement.  That makes it sound as if clang is a second class
> option compared to recent gcc, but this is certainly not the case:
> results from clang are comparable to the latest gcc versions and the
> design of clang is such that further optimizations and improvements can
> be readily incorporated.

and - at least for now - clang itself is very slow. But produces not worse 
(or better) code than gcc.