linux-kernel - Re: [PATCH 4/6] Add support for LZO-compressed kernels for ARM

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Message-ID: <4A7C8CD3.1090404@zytor.com>
Date:	Fri, 07 Aug 2009 13:21:39 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Albin Tonnerre <albin.tonnerre@...e-electrons.com>,
	Matthieu CASTET <matthieu.castet@...rot.com>,
	Alain Knaff <alain@...ff.lu>,
	"sam@...nborg.org" <sam@...nborg.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-embedded@...r.kernel.org" <linux-embedded@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH 4/6] Add support for LZO-compressed kernels for ARM

On 08/07/2009 01:00 PM, Russell King - ARM Linux wrote:
> On Fri, Aug 07, 2009 at 03:55:24PM +0200, Albin Tonnerre wrote:
>> That's true for the actual kernel image, but not for the bootstrap code we use
>> when compiling compressed kernels. arch/arm/boot/compressed/Makefile uses
>> libgcc, unless I'm overlooking something here:
>>
>>   arm-unknown-linux-uclibcgnueabi-ld -EL    --defsym zreladdr=0x20008000
>>   --defsym initrd_phys=0x20410000 --defsym params_phys=0x20000100 -p
>>   --no-undefined -X
>>   /home/albin/x-tools/arm-unknown-linux-uclibcgnueabi/lib/gcc/arm-unknown-linux-uclibcgnueabi/4.3.2/libgcc.a
>>   -T arch/arm/boot/compressed/vmlinux.lds arch/arm/boot/compressed/head.o
>>   arch/arm/boot/compressed/piggy.gzip.o arch/arm/boot/compressed/misc.o -o
>>   arch/arm/boot/compressed/vmlinux
> 
> It's because libgcc appears in the wrong place in the command line, and
> due to the way kbuild works, we can't get it into the right place easily.
> 
> Linkers are sensitive to the order of archives on the command line - its
> pointless having an archive as the first file argument because none of
> the contained objects will ever be pulled in.
> 
> Sam - any ideas how to solve this?

Can we use the group feature of ld for this?

	-hpa

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