From owner-freebsd-hackers@FreeBSD.ORG  Sat Dec 22 18:09:54 2012
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
 by hub.freebsd.org (Postfix) with ESMTP id D85E345A;
 Sat, 22 Dec 2012 18:09:54 +0000 (UTC) (envelope-from bright@mu.org)
Received: from elvis.mu.org (elvis.mu.org [192.203.228.196])
 by mx1.freebsd.org (Postfix) with ESMTP id B99C68FC12;
 Sat, 22 Dec 2012 18:09:54 +0000 (UTC)
Received: from Alfreds-MacBook-Pro-9.local
 (c-67-180-208-218.hsd1.ca.comcast.net [67.180.208.218])
 by elvis.mu.org (Postfix) with ESMTPSA id 282811A3C2A;
 Sat, 22 Dec 2012 10:09:54 -0800 (PST)
Message-ID: <50D5F774.6070502@mu.org>
Date: Sat, 22 Dec 2012 10:09:56 -0800
From: Alfred Perlstein <bright@mu.org>
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7;
 rv:17.0) Gecko/17.0 Thunderbird/17.0
MIME-Version: 1.0
To: Ed Maste <emaste@freebsd.org>
Subject: Re: [PATCH] Add WITH_DEBUG_FILES knob to enable separate debug files
References: <20121222164602.GB32022@sandvine.com>
In-Reply-To: <20121222164602.GB32022@sandvine.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: freebsd-hackers@freebsd.org
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
 <freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-hackers>, 
 <mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
 <mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 22 Dec 2012 18:09:54 -0000

On 12/22/12 8:46 AM, Ed Maste wrote:
> When this knob is set standalone debug files for shared objects are
> built and installed in /usr/lib/debug/<so pathname>.debug.  GDB
> searches this path for debug data.
>
> The -g flag is automatically added to CFLAGS if debug files are enabled
> (but the shared objects are still installed stripped, if DEBUG_FLAGS is
> not set).
> ---
> This is a refinement of my earlier change for shared object standalone
> debug.  This patch also includes the following changes:
>
> - Change GDB's standalone debug file path to the default /usr/lib/debug.
>
> - Change debug file extension from 'symbols' to 'debug', in line with
>    GDB's documentation.  I initially followed the kernel build example
>    in choosing .symbols, but .debug more accurately represents the use
>    of these files.
>
This looks promising.  After this patch, running "gdb 
./a.linked.with.libc.so.out" should work without any extra thinking?

I'll give it a shot.

We should enable this flag by default.  A big FreeBSD strength is our 
debugging system.

-Alfred