linux-kernel - Re: Linux kernel support -O0 optimization flag?

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Message-ID: <20130424082934.GA9365@amd.pavel.ucw.cz>
Date:	Wed, 24 Apr 2013 10:29:38 +0200
From:	Pavel Machek <pavel@...x.de>
To:	richard -rw- weinberger <richard.weinberger@...il.com>
Cc:	Ley Foon Tan <lftan@...era.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Kenneth Chong Yin Tan <cytan@...era.com>
Subject: Re: Linux kernel support -O0 optimization flag?

On Mon 2013-04-15 13:16:36, richard -rw- weinberger wrote:
> On Mon, Apr 15, 2013 at 9:58 AM, Ley Foon Tan <lftan@...era.com> wrote:
> >
> >
> > Change KBUILD_CFLAGS to -O0 in Makefile and got the compilation error as
> > below.
> > Is the Linux kernel support -O0 optimization flag?
> 
> No. If I'm not mistaken we need this to make sure that the compiler
> inlines some functions.
> 
> In your case the compiler failed to compute the BUILD_BUG() macro correctly.
> It depends also on optimization.

Actually... You probably could replace BUILD_BUG() with nop. Bugs are
not expected to happen, right? you'll probably hit something else...

								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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