linux-kernel - Re: Linux Kernel GDB tracepoint module 2010-8-30 release

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Message-ID: <AANLkTimYgMotZBbGTvPGSzfo3jjZ_-TeXftVQ6bBzHrT@mail.gmail.com>
Date:	Sat, 4 Sep 2010 17:17:27 +0800
From:	Hui Zhu <teawater@...il.com>
To:	Steven <mqyoung@...il.com>
Cc:	"gdb@...rceware.org" <gdb@...rceware.org>,
	linux-kernel@...r.kernel.org, Michael Snyder <msnyder@...are.com>,
	Marc Khouzam <marc.khouzam@...csson.com>,
	Thiago Jung Bauermann <thiago.bauermann@...il.com>,
	"Frank Ch. Eigler" <fche@...hat.com>
Subject: Re: Linux Kernel GDB tracepoint module 2010-8-30 release

On Sat, Sep 4, 2010 at 16:56, Steven <mqyoung@...il.com> wrote:
> On Sat, 2010-09-04 at 11:41 +0800, Hui Zhu wrote:
>> BTW, looks GCC and GDB don't want handle the optimization debug
>> trouble (all they want is rewrite the GCC in C++ :P).
>> So I think make linux kernel can close optimization is better idea, do
>> you know some way or some patch to do it?
>>
>
> Just disable CONFIG_CC_OPTIMIZE_FOR_SIZE and modify the Makefile of
> kernel:
> KBUILD_CFLAGS   += -O2
> to
> KBUILD_CFLAGS   += -O0

Cool,  :)

I try just change the compile option of readdir.c to without -O2, it
works OK.  I think maybe it's a GDB bug too.
Could you try the second issue with gdb 7.2?

BTW, I think I need add some words let all the KGTP user use gdb 7.2
with KGTP in howto.  :)

Thanks for help me with this big issue.  :)

Best,
Hui

>
> Sometime gcc will still optimize out some variables even I compile a
> program with -O0, so volatile is required sometimes.
>
> Thanks,
> Steven
>
>
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