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

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Message-ID: <52488.94.211.195.167.1291029121.squirrel@gate.crashing.org>
Date:	Mon, 29 Nov 2010 12:12:01 +0100 (CET)
From:	"Segher Boessenkool" <segher@...nel.crashing.org>
To:	"Christian Borntraeger" <borntraeger@...ibm.com>
Cc:	Américo 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

> In essence -O2 just tells gcc to activate a list of optimizations
> gcc  -Q -O2 --help=optimizers
> tells you what.

Not quite; see http://gcc.gnu.org/wiki/FAQ#optimization-options .


Segher

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