linux-kernel - Re: Building Kernel with -O0

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Message-ID: <2cf1ee820809112221w213aa929x32905e1c25897cf3@mail.gmail.com>
Date:	Fri, 12 Sep 2008 08:21:36 +0300
From:	"emin ak" <eminak71@...il.com>
To:	"linux-os (Dick Johnson)" <linux-os@...logic.com>,
	"Adrian Bunk" <bunk@...nel.org>,
	"Linux kernel" <linux-kernel@...r.kernel.org>
Cc:	7eggert@....de
Subject: Re: Building Kernel with -O0

2008/9/10 Bodo Eggert <7eggert@....de>:
> linux-os (Dick Johnson) <linux-os@...logic.com> wrote:
>
>> If you have to single-step through kernel procedures, you
>> are not writing proper code for a kernel. Furthermore, even
>> when using the kernel debugger, you are not executing the
>> exact same path that would be executed without the debugger
>> attached.
>
> I sometimes single-step in order to verify my (userspace) code, instead of
> just throwing random test data at it. It's easier and makes me feel better.
> OTOH, -O2 never was a problem if I used it, so I don't strongly vote
> for enabling -O0.
>
> --

I had compiled linux-2.6.23 with -O0 for kgdb only with little
modifications, it's  running with no error for a long time. I'am not a
linux expert, I think talented kernel hackers can make kernel to
compile with -O0 easly but for some reason they dont want to do it.
Debug is much understandable for me (and for most people I think) with
-O0. Linux kernel programming ability is not a gift, of course you can
learn the code with printks and reading, but which age are we living
in?

Emin
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