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

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Message-ID: <CAFLxGvw7Cj_wz_A9B+fBR6jYxi+73Ofh-PjUT=FC+iF0AkDQsQ@mail.gmail.com>
Date:	Mon, 15 Apr 2013 13:16:36 +0200
From:	richard -rw- weinberger <richard.weinberger@...il.com>
To:	Ley Foon Tan <lftan@...era.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Kenneth Chong Yin Tan <cytan@...era.com>
Subject: Re: Linux kernel support -O0 optimization flag?

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.

--
Thanks,
//richard
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