linux-kernel - Re: 2.6.18-rc4 warning on arch/x86

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Message-Id: <200608090909.19985.ak@suse.de>
Date:	Wed, 9 Aug 2006 09:09:19 +0200
From:	Andi Kleen <ak@...e.de>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
Cc:	Keith Owens <kaos@....com.au>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.18-rc4 warning on arch/x86_64/boot/compressed/head.o

On Wednesday 09 August 2006 08:26, Jan Engelhardt wrote:
> >> Compiling 2.6.18-rc4 on x86_64 gets this warning.
> >> 
> >>   gcc -Wp,-MD,arch/x86_64/boot/compressed/.head.o.d  -nostdinc -isystem /usr/lib64/gcc/x86_64-suse-linux/4.1.0/include -D__KERNEL__ -Iinclude -Iinclude2 -I$KBUILD_OUTPUT/linux/include -include include/linux/autoconf.h -D__ASSEMBLY__ -m64 -traditional -m32  -c -o arch/x86_64/boot/compressed/head.o $KBUILD_OUTPUT/linux/arch/x86_64/boot/compressed/head.S
> >>   ld -m elf_i386  -Ttext 0x100000 -e startup_32 -m elf_i386 arch/x86_64/boot/compressed/head.o arch/x86_64/boot/compressed/misc.o arch/x86_64/boot/compressed/piggy.o -o arch/x86_64/boot/compressed/vmlinux 
> >> ld: warning: i386:x86-64 architecture of input file `arch/x86_64/boot/compressed/head.o' is incompatible with i386 output
> >
> >It always gave that since some binutils update long ago.
> >If you know how to fix it please submit a patch, but as far as I know it's harmless.
> 
> Why is -m elf_i386 passed to ld?
> I suppose because this is necessary because AMD64 starts in i386 16-bit 
> real mode?
> Might try -m elf32-little or -m elf64-little.

If you think you have a solution please submit a tested patch.

-Andi
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