Re: [2.6 patch] re-add -ffreestanding

From: Adrian Bunk
Date: Tue Aug 22 2006 - 07:15:52 EST

On Tue, Aug 22, 2006 at 12:37:13PM +0200, Andi Kleen wrote:
> On Mon, 21 Aug 2006 23:37:31 -0400
> Kyle Moffett <mrmacman_g4@xxxxxxx> wrote:
> > On Aug 21, 2006, at 19:13:20, Andi Kleen wrote:
> > >> What's the problem with adding -ffreestanding and stating
> > >> explicitely which functions we want to be handled be builtins, and
> > >> which functions we don't want to be handled by builtins?
> > >
> > > Take a look at lib/string.c and think about it a bit.
> >
> > So why can't lib/string.c explicitly say __builtin_foo() instead of
> > foo() where we mean the former?
> Because gcc when using builtins sometimes decides to call the
> out of line version (usually when it can't figure out the alignment
> and generic alignment code would be too large to inline). And it will
> always call str/memfoo not __builtin_str/memfoo

IOW, we might in some cases require an out-of-line version of the

I don't see in this case any problem created by using -ffreestanding and
the #define's.

> -Andi



"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at