From owner-freebsd-current@FreeBSD.ORG  Fri Aug  3 04:06:25 2007
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 5737016A417
	for <freebsd-current@freebsd.org>; Fri,  3 Aug 2007 04:06:25 +0000 (UTC)
	(envelope-from njf@statseeker.com)
Received: from wally.statseeker.com (wally.statseeker.com [203.39.101.146])
	by mx1.freebsd.org (Postfix) with ESMTP id D422D13C478
	for <freebsd-current@freebsd.org>; Fri,  3 Aug 2007 04:06:24 +0000 (UTC)
	(envelope-from njf@statseeker.com)
Received: from localhost (localhost.statseeker.com [127.0.0.1])
	by wally.statseeker.com (8.13.8/8.13.8) with ESMTP id l733s3hV084677
	for <freebsd-current@freebsd.org>; Fri, 3 Aug 2007 13:54:03 +1000 (EST)
	(envelope-from njf@statseeker.com)
X-Virus-Scanned: amavisd-new at statseeker.com
Received: from wally.statseeker.com ([127.0.0.1])
	by localhost (wally.statseeker.com [127.0.0.1]) (amavisd-new,
	port 10024)
	with LMTP id xW-4TeWL1VfL for <freebsd-current@freebsd.org>;
	Fri,  3 Aug 2007 13:53:53 +1000 (EST)
Received: from tardis.statseeker.com (tardis.statseeker.com [10.1.1.79])
	(authenticated bits=0)
	by wally.statseeker.com (8.13.8/8.13.8) with ESMTP id l733rK78084657
	for <freebsd-current@freebsd.org>; Fri, 3 Aug 2007 13:53:20 +1000 (EST)
	(envelope-from njf@statseeker.com)
Message-ID: <46B2A6B0.1030609@statseeker.com>
Date: Fri, 03 Aug 2007 13:53:20 +1000
From: Nick Frampton <njf@statseeker.com>
Organization: Statseeker
User-Agent: Thunderbird 2.0.0.4 (X11/20070724)
MIME-Version: 1.0
To: freebsd-current@freebsd.org
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Subject: gcc 4.2 profiling breaks argv
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
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: Fri, 03 Aug 2007 04:06:25 -0000

Hi all,

Programs segfault when attempting to access argv from main when compiled 
under gcc 4.2.0 with the -pg profiling option.  The following program 
illustrates this problem.

$ cat test.c
#include <stdio.h>
int main (int argc, char **argv) {
   fprintf (stderr, "argv=%p\n", argv);
   return 0;
}
$ cc -c -o test.o -pg  test.c  &&  cc -o test  -pg  test.o
$ ./test
Segmentation fault (core dumped)

$ cc -v
Using built-in specs.
Target: i386-undermydesk-freebsd
Configured with: FreeBSD/i386 system compiler
Thread model: posix
gcc version 4.2.0 20070514 [FreeBSD]

$ uname -a
FreeBSD test03.statseeker.com 7.0-CURRENT FreeBSD 7.0-CURRENT #1: Fri 
Aug  3 11:07:03 EST 2007     
root@test03.statseeker.com:/usr/obj/usr/src/sys/GENERIC  i386

This issue was reported on this list on 5th July 2007 by Garrett Cooper 
but argv was not mentioned in that post.  I have not seen this problem 
reported elsewhere (e.g. on the gcc mailing list).

-Nick
**