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Message-ID: <20060830183905.GB31594@flint.arm.linux.org.uk> Date: Wed, 30 Aug 2006 19:39:05 +0100 From: Russell King <rmk+lkml@....linux.org.uk> To: Andi Kleen <ak@...e.de> Cc: Adrian Bunk <bunk@...sta.de>, Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org, Roman Zippel <zippel@...ux-m68k.org> Subject: Re: [2.6 patch] re-add -ffreestanding On Wed, Aug 30, 2006 at 08:13:58PM +0200, Andi Kleen wrote: > On Wednesday 30 August 2006 19:57, Adrian Bunk wrote: > > I got the following compile error with gcc 4.1.1 when trying to compile > > kernel 2.6.18-rc4-mm2 for m68k: > > If anything then -ffreestanding needs to be added to arch/m68k/Makefile > (assuming it doesn't compile at all right now) Looking at the effect of -ffreestanding on ARM, it appears that on one hand, the overall image size is reduced by 0.016% but we end up with worse code - eg, strlen() of the same string in the same function evaluated multiple times vs once without -ffreestanding. The difference probably comes down to the lack of __attribute__((pure)) on our string functions in linux/string.h. If we are going to go for -ffreestanding, we need to fix linux/string.h in that respect _first_. -- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 Serial core - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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