Re: 2.6.18-rc4 warning on arch/x86_64/boot/compressed/head.o

From: Jan Engelhardt
Date: Wed Aug 09 2006 - 02:25:06 EST

>> 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.

Jan Engelhardt
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