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Date: Mon, 10 Feb 2003 08:28:52 -0800 (PST)
From: devnetfs <devnetfs@yahoo.com>
Subject: Re: compiling kernel with debug and optimization 
To: Keith Owens <kaos@ocs.com.au>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <2721.1044876757@ocs3.intra.ocs.com.au>
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Thanks for you reply Keith :)

The reason I asked this question is -- Distro's like RH (i guess it
holds for others too) DONT distribute kernels compiled with -g and
I was wondering why? 

Agreed about the compile-time+disk overhead, but that's ONE time
affair. Analyzing a system-core-dump of a "-g" built kernel (using
MCL's crash) is much easier and fruitful than otherwise.

so is it (just) the disk-space overhead that keeps distributions 
from NOT compiling with "-g" option?!

Thanks once again,

Regards,
A.



--- Keith Owens <kaos@ocs.com.au> wrote:
> On Mon, 10 Feb 2003 03:11:51 -0800 (PST), 
> devnetfs <devnetfs@yahoo.com> wrote:
> >Does compiling with -g option degrade performance? IMO it should
> NOT.
> 
> Compiling with -g slows down compilation and link, mainly because of
> the extra debugging data that has to be copied around.  -g
> significantly increases disk usage.
> 
> >If that's true, then why dont we compile kernels with both -g and
> -O2
> >always? Also does using -g AND -O2 cause some optimizations to be 
> >missed out?
> 
> With gcc, compiling with -g should have no effect on the kernel.  One
> of my occasional tests is to build vmlinux with and without -g, run
> both through strip -g and compare the results.  They should be
> identical except for the build timestamp.
> 


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