linux-kernel - Re: [PATCH] Built kernel without -O2 option

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Date:	Mon, 29 Nov 2010 12:57:24 +0100
From:	Nicholas Mc Guire <der.herr@...r.at>
To:	Christian Borntraeger <borntraeger@...ibm.com>
Cc:	Segher Boessenkool <segher@...nel.crashing.org>,
	Am?rico Wang <xiyou.wangcong@...il.com>,
	Hui Zhu <teawater@...il.com>, linux-kernel@...r.kernel.org,
	gdb@...rceware.org, hellogcc@...elists.org,
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] Built kernel without -O2 option

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
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