linux-kernel - Re: [2.6 patch] re-add -ffreestanding

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Message-ID: <20060821214636.GP11651@stusta.de>
Date:	Mon, 21 Aug 2006 23:46:36 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Andi Kleen <ak@...e.de>
Cc:	linux-kernel@...r.kernel.org, Roman Zippel <zippel@...ux-m68k.org>
Subject: Re: [2.6 patch] re-add -ffreestanding

On Mon, Aug 21, 2006 at 11:24:44PM +0200, Andi Kleen wrote:
> On Mon, 21 Aug 2006 23:21:54 +0200
> Adrian Bunk <bunk@...sta.de> wrote:
> 
> > I got the following compile error with gcc 4.1.1 when trying to compile 
> > kernel 2.6.18-rc4-mm2 for m68k:
> 
> I object to this change. -ffreestanding shouldn't be forced on everybody

Why?

The Linux kernel is a freestanding environment.

Omitting -ffreestanding only for allowing gcc to automatically use 
builtins isn't a good idea (as we have already seen).

We can easily enable as many gcc builtins as we want.
We could even do this for all platforms in include/linux/string.h

It might make sense to do this properly since it could e.g. be the gcc 
builtins produce no worse code than the inlines in 
include/asm-i386/string.h.

But if this should be done, let's do it right and explicitely.

> -Andi

cu
Adrian

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