From owner-svn-src-head@FreeBSD.ORG  Fri Mar 13 18:38:29 2015
Return-Path: <owner-svn-src-head@FreeBSD.ORG>
Delivered-To: svn-src-head@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 2488E417;
 Fri, 13 Mar 2015 18:38:29 +0000 (UTC)
Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1])
 (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id A02631D4;
 Fri, 13 Mar 2015 18:38:28 +0000 (UTC)
Received: from tom.home (kostik@localhost [127.0.0.1])
 by kib.kiev.ua (8.14.9/8.14.9) with ESMTP id t2DIcNJb028490
 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO);
 Fri, 13 Mar 2015 20:38:23 +0200 (EET)
 (envelope-from kostikbel@gmail.com)
DKIM-Filter: OpenDKIM Filter v2.9.2 kib.kiev.ua t2DIcNJb028490
Received: (from kostik@localhost)
 by tom.home (8.14.9/8.14.9/Submit) id t2DIcNmc028489;
 Fri, 13 Mar 2015 20:38:23 +0200 (EET)
 (envelope-from kostikbel@gmail.com)
X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com
 using -f
Date: Fri, 13 Mar 2015 20:38:23 +0200
From: Konstantin Belousov <kostikbel@gmail.com>
To: Nathan Whitehorn <nwhitehorn@freebsd.org>
Subject: Re: svn commit: r279937 - in head/sys/powerpc: include powerpc
Message-ID: <20150313183823.GB2379@kib.kiev.ua>
References: <20150312212234.GS2379@kib.kiev.ua> <55020547.7050102@freebsd.org>
 <20150312213530.GT2379@kib.kiev.ua> <5502094D.5090001@freebsd.org>
 <20150313084702.GV2379@kib.kiev.ua> <550318FD.1070906@freebsd.org>
 <20150313172345.GY2379@kib.kiev.ua> <5503224A.3010100@freebsd.org>
 <20150313175931.GA2379@kib.kiev.ua> <550328C2.6060602@freebsd.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <550328C2.6060602@freebsd.org>
User-Agent: Mutt/1.5.23 (2014-03-12)
X-Spam-Status: No, score=-2.0 required=5.0 tests=ALL_TRUSTED,BAYES_00,
 DKIM_ADSP_CUSTOM_MED,FREEMAIL_FROM,NML_ADSP_CUSTOM_MED autolearn=no
 autolearn_force=no version=3.4.0
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on tom.home
Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
 src-committers@freebsd.org
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.18-1
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head/>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 13 Mar 2015 18:38:29 -0000

On Fri, Mar 13, 2015 at 11:13:22AM -0700, Nathan Whitehorn wrote:
> The compiler assumes that f14-f31 and v20-v31 are preserved by setjmp() 
> (and, e.g. glibc's setjmp() does in fact preserve them). It also tries 
> not to use those registers too much, so the practical impact is limited, 
> but it should actually be fixed.

I think that the setjmp/longjmp case would benefit greatly from the
versioning of the symbols.  Versioning cannot solve all ABI issues,
e.g. if you compiler used old machine/setjmp.h and then link resulting
.o with newer libc, but for complete builds it will help and keep
old binaries working not worse than now.