From: Nicholas Mc Guire <der.herr@hofr.at>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Segher Boessenkool <segher@kernel.crashing.org>,
Am?rico Wang <xiyou.wangcong@gmail.com>,
Hui Zhu <teawater@gmail.com>,
linux-kernel@vger.kernel.org, gdb@sourceware.org,
hellogcc@freelists.org, linux-kbuild@vger.kernel.org
Subject: Re: [PATCH] Built kernel without -O2 option
Date: Mon, 29 Nov 2010 12:57:24 +0100 [thread overview]
Message-ID: <20101129115724.GA32318@opentech.at> (raw)
In-Reply-To: <4CF38BBA.4020202@de.ibm.com>
On Mon, 29 Nov 2010, Christian Borntraeger wrote:
> Am 29.11.2010 12:12, schrieb Segher Boessenkool:
> >> In essence -O2 just tells gcc to activate a list of optimizations
> >> gcc -Q -O2 --help=optimizers
I think for completness you would need to pass
gcc -Wextra -Q -O2 --help=optimizers
or you could miss some options
> >> tells you what.
> >
> > Not quite; see http://gcc.gnu.org/wiki/FAQ#optimization-options .
> >
>
> Erm...right. Thank you.
well I guess you always could explicidly turn off all optioins with
-fnoWHATEVER you want to disable and thus remove all unwanted flags
- admitedly a bit painfull though.
hofrat
next prev parent reply other threads:[~2010-11-29 12:07 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-29 3:56 [PATCH] Built kernel without -O2 option Hui Zhu
2010-11-29 8:16 ` Américo Wang
2010-11-29 8:18 ` microcai
2010-11-29 8:24 ` Hui Zhu
[not found] ` <4CF36741.9000808@loongson.cn>
2010-11-29 8:47 ` [hellogcc] " Hui Zhu
2010-11-29 8:55 ` Steven
2010-11-29 8:57 ` Hui Zhu
2010-11-29 9:45 ` 乔崇
2010-11-29 18:10 ` Valdis.Kletnieks
2010-11-29 18:34 ` Steven J. Magnani
2010-11-29 22:03 ` Alexey Dobriyan
2010-12-01 13:21 ` Hui Zhu
2010-12-01 12:23 ` bekars
2010-12-01 13:24 ` Hui Zhu
2010-12-01 13:58 ` bekars
2010-12-01 15:01 ` Hui Zhu
2010-12-01 15:42 ` jovi zhang
2010-11-29 8:52 ` Américo Wang
2010-11-29 9:11 ` Hui Zhu
2010-11-29 18:03 ` Valdis.Kletnieks
2010-11-29 20:51 ` richard -rw- weinberger
2010-11-29 21:00 ` Arnaud Lacombe
2010-11-29 21:07 ` richard -rw- weinberger
2010-11-29 9:44 ` Christian Borntraeger
2010-11-29 11:12 ` Segher Boessenkool
2010-11-29 11:17 ` Christian Borntraeger
2010-11-29 11:57 ` Nicholas Mc Guire [this message]
2010-12-01 12:18 ` Hui Zhu
2010-11-29 9:59 ` Andi Kleen
2010-11-29 10:12 ` Mark Wielaard
2010-11-30 9:31 ` Américo Wang
2010-11-30 18:40 ` Michael Snyder
2010-12-01 12:52 ` Hui Zhu
2010-11-29 19:05 ` Jan Kratochvil
2010-11-29 21:07 ` Arnaud Lacombe
2010-11-30 22:40 ` Petr Hluzín
2010-12-01 13:42 ` Hui Zhu
2010-12-01 13:10 ` Hui Zhu
2011-01-24 7:47 ` Hui Zhu
2011-01-24 8:11 ` Kevin Pouget
2011-01-24 12:42 ` Hui Zhu
2011-01-28 3:41 ` Hui Zhu
2011-02-17 2:43 ` Hui Zhu
[not found] ` <AANLkTik+beFdZZHLyei044q8EPHwvmiKoFAvAHsNuhmw@mail.gmail.com>
2011-02-21 12:51 ` Kevin Pouget
2011-02-23 5:19 ` Hui Zhu
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