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

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Message-ID: <1291055689.5489.1.camel@iscandar.digidescorp.com>
Date:	Mon, 29 Nov 2010 12:34:49 -0600
From:	"Steven J. Magnani" <steve@...idescorp.com>
To:	linux-kernel@...r.kernel.org
Cc:	乔崇 <qiaochong@...ngson.cn>,
	hellogcc@...elists.org,
	Américo Wang <xiyou.wangcong@...il.com>,
	gdb@...rceware.org, Valdis.Kletnieks@...edu
Subject: Re: [hellogcc] Re: [PATCH] Built kernel without -O2 option

On Mon, 2010-11-29 at 13:10 -0500, Valdis.Kletnieks@...edu wrote:
> On Mon, 29 Nov 2010 17:45:15 +0800, ä¹”å´‡ said:
> 
> > change mycc to this will work,:)
> > 
> > #!/bin/sh
> > gcc "$@" -O0 ||
> >  gcc "$@" -O1 ||
> >  gcc "$@"
> 
> That may result in issues - the problem is that there are places in the kernel
> where 'gcc -O0' will *compile* cleanly, but not actually *run* correctly.
> 

There may be arch-specific places that cannot be made to run -O0. 
See this thread from a few years ago:

http://www.spinics.net/lists/arm-kernel/msg24836.html

------------------------------------------------------------------------
 Steven J. Magnani               "I claim this network for MARS!
 www.digidescorp.com              Earthling, return my space modulator!"

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