* 2.6.18-rc4 warning on arch/x86_64/boot/compressed/head.o @ 2006-08-08 2:47 Keith Owens 2006-08-08 2:55 ` Andi Kleen 0 siblings, 1 reply; 7+ messages in thread From: Keith Owens @ 2006-08-08 2:47 UTC (permalink / raw) To: linux-kernel; +Cc: ak 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 $KBUILD_OUTPUT/linux/arch/x86_64/boot/compressed/head.S ld -m elf_i386 -Ttext 0x100000 -e startup_32 -m elf_i386 arch/x86_64/boot/compressed/head.o arch/x86_64/boot/compressed/misc.o arch/x86_64/boot/compressed/piggy.o -o arch/x86_64/boot/compressed/vmlinux ld: warning: i386:x86-64 architecture of input file `arch/x86_64/boot/compressed/head.o' is incompatible with i386 output ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: 2.6.18-rc4 warning on arch/x86_64/boot/compressed/head.o 2006-08-08 2:47 2.6.18-rc4 warning on arch/x86_64/boot/compressed/head.o Keith Owens @ 2006-08-08 2:55 ` Andi Kleen 2006-08-09 6:26 ` Jan Engelhardt 0 siblings, 1 reply; 7+ messages in thread From: Andi Kleen @ 2006-08-08 2:55 UTC (permalink / raw) To: Keith Owens; +Cc: linux-kernel On Tuesday 08 August 2006 04:47, Keith Owens wrote: > Compiling 2.6.18-rc4 on x86_64 gets this warning. > > gcc -Wp,-MD,arch/x86_64/boot/compressed/.head.o.d -nostdinc -isystem /usr/lib64/gcc/x86_64-suse-linux/4.1.0/include -D__KERNEL__ -Iinclude -Iinclude2 -I$KBUILD_OUTPUT/linux/include -include include/linux/autoconf.h -D__ASSEMBLY__ -m64 -traditional -m32 -c -o arch/x86_64/boot/compressed/head.o $KBUILD_OUTPUT/linux/arch/x86_64/boot/compressed/head.S > ld -m elf_i386 -Ttext 0x100000 -e startup_32 -m elf_i386 arch/x86_64/boot/compressed/head.o arch/x86_64/boot/compressed/misc.o arch/x86_64/boot/compressed/piggy.o -o arch/x86_64/boot/compressed/vmlinux > ld: warning: i386:x86-64 architecture of input file `arch/x86_64/boot/compressed/head.o' is incompatible with i386 output > It always gave that since some binutils update long ago. If you know how to fix it please submit a patch, but as far as I know it's harmless. -Andi ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: 2.6.18-rc4 warning on arch/x86_64/boot/compressed/head.o 2006-08-08 2:55 ` Andi Kleen @ 2006-08-09 6:26 ` Jan Engelhardt 2006-08-09 7:09 ` Andi Kleen 0 siblings, 1 reply; 7+ messages in thread From: Jan Engelhardt @ 2006-08-09 6:26 UTC (permalink / raw) To: Andi Kleen; +Cc: Keith Owens, linux-kernel >> Compiling 2.6.18-rc4 on x86_64 gets this warning. >> >> gcc -Wp,-MD,arch/x86_64/boot/compressed/.head.o.d -nostdinc -isystem /usr/lib64/gcc/x86_64-suse-linux/4.1.0/include -D__KERNEL__ -Iinclude -Iinclude2 -I$KBUILD_OUTPUT/linux/include -include include/linux/autoconf.h -D__ASSEMBLY__ -m64 -traditional -m32 -c -o arch/x86_64/boot/compressed/head.o $KBUILD_OUTPUT/linux/arch/x86_64/boot/compressed/head.S >> ld -m elf_i386 -Ttext 0x100000 -e startup_32 -m elf_i386 arch/x86_64/boot/compressed/head.o arch/x86_64/boot/compressed/misc.o arch/x86_64/boot/compressed/piggy.o -o arch/x86_64/boot/compressed/vmlinux >> ld: warning: i386:x86-64 architecture of input file `arch/x86_64/boot/compressed/head.o' is incompatible with i386 output > >It always gave that since some binutils update long ago. >If you know how to fix it please submit a patch, but as far as I know it's harmless. Why is -m elf_i386 passed to ld? I suppose because this is necessary because AMD64 starts in i386 16-bit real mode? Might try -m elf32-little or -m elf64-little. Jan Engelhardt -- ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: 2.6.18-rc4 warning on arch/x86_64/boot/compressed/head.o 2006-08-09 6:26 ` Jan Engelhardt @ 2006-08-09 7:09 ` Andi Kleen 2006-08-10 7:23 ` Jan Engelhardt 0 siblings, 1 reply; 7+ messages in thread From: Andi Kleen @ 2006-08-09 7:09 UTC (permalink / raw) To: Jan Engelhardt; +Cc: Keith Owens, linux-kernel On Wednesday 09 August 2006 08:26, Jan Engelhardt wrote: > >> Compiling 2.6.18-rc4 on x86_64 gets this warning. > >> > >> gcc -Wp,-MD,arch/x86_64/boot/compressed/.head.o.d -nostdinc -isystem /usr/lib64/gcc/x86_64-suse-linux/4.1.0/include -D__KERNEL__ -Iinclude -Iinclude2 -I$KBUILD_OUTPUT/linux/include -include include/linux/autoconf.h -D__ASSEMBLY__ -m64 -traditional -m32 -c -o arch/x86_64/boot/compressed/head.o $KBUILD_OUTPUT/linux/arch/x86_64/boot/compressed/head.S > >> ld -m elf_i386 -Ttext 0x100000 -e startup_32 -m elf_i386 arch/x86_64/boot/compressed/head.o arch/x86_64/boot/compressed/misc.o arch/x86_64/boot/compressed/piggy.o -o arch/x86_64/boot/compressed/vmlinux > >> ld: warning: i386:x86-64 architecture of input file `arch/x86_64/boot/compressed/head.o' is incompatible with i386 output > > > >It always gave that since some binutils update long ago. > >If you know how to fix it please submit a patch, but as far as I know it's harmless. > > Why is -m elf_i386 passed to ld? > I suppose because this is necessary because AMD64 starts in i386 16-bit > real mode? > Might try -m elf32-little or -m elf64-little. If you think you have a solution please submit a tested patch. -Andi ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: 2.6.18-rc4 warning on arch/x86_64/boot/compressed/head.o 2006-08-09 7:09 ` Andi Kleen @ 2006-08-10 7:23 ` Jan Engelhardt 2006-08-15 13:11 ` Jan Engelhardt 0 siblings, 1 reply; 7+ messages in thread From: Jan Engelhardt @ 2006-08-10 7:23 UTC (permalink / raw) To: Andi Kleen; +Cc: Keith Owens, linux-kernel >> >> Compiling 2.6.18-rc4 on x86_64 gets this warning. >> >> >> >> gcc -Wp,-MD,arch/x86_64/boot/compressed/.head.o.d -nostdinc -isystem /usr/lib64/gcc/x86_64-suse-linux/4.1.0/include -D__KERNEL__ -Iinclude -Iinclude2 -I$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. >> >If you think you have a solution please submit a tested patch. Ok here: Actually you have to look some lines above, namely 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 -include include/linux/autoconf.h -D__ASSEMBLY__ -m64 -traditional -m32 -c -o arch/x86_64/boot/compressed/head.o arch/x86_64/boot/compressed/head.S It specifies both -m64 and -m32 on the line. Let's see what happens: $ file arch/x86_64/boot/compressed/head.o arch/x86_64/boot/compressed/head.o: ELF 64-bit LSB relocatable, AMD x86-64, version 1 (SYSV), not stripped $ grep AFLAGS arch/x86_64/boot/compressed/Makefile EXTRA_AFLAGS := -traditional -m32 I would have expected it to become an ELF32 object, but it is not. Bug or feature of gcc/as? $ gcc -v gcc version 4.1.0 (SUSE Linux/10.1) $ as -v GNU assembler version 2.16.91.0.5 (x86_64-suse-linux) using BFD version 2.16.91.0.5 20051219 (SUSE Linux) Patch below kills the warning, but I question how appropriate this is (it feels like casting a warning in C away).. I did not test how the resulting kernel image behaves, as I do not have any x64 that I could just reboot or install vmware on. diff --fast -Ndpru linux-2.6.18-rc4/arch/x86_64/boot/compressed/Makefile linux-2.6.18-rc4+/arch/x86_64/boot/compressed/Makefile --- linux-2.6.18-rc4/arch/x86_64/boot/compressed/Makefile 2006-08-06 14:20:11.000000000 -0400 +++ linux-2.6.18-rc4+/arch/x86_64/boot/compressed/Makefile 2006-08-10 03:19:34.000000000 -0400 @@ -7,6 +7,7 @@ # targets := vmlinux vmlinux.bin vmlinux.bin.gz head.o misc.o piggy.o +AFLAGS := $(filter-out -m64,$(AFLAGS)) EXTRA_AFLAGS := -traditional -m32 # cannot use EXTRA_CFLAGS because base CFLAGS contains -mkernel which conflicts with #<<eof>> Jan Engelhardt -- ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: 2.6.18-rc4 warning on arch/x86_64/boot/compressed/head.o 2006-08-10 7:23 ` Jan Engelhardt @ 2006-08-15 13:11 ` Jan Engelhardt 2006-08-15 14:07 ` Andi Kleen 0 siblings, 1 reply; 7+ messages in thread From: Jan Engelhardt @ 2006-08-15 13:11 UTC (permalink / raw) To: Andi Kleen; +Cc: Keith Owens, linux-kernel I wrote: >>>>>Andi Kleen 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 [...] >Ok here: [...] Any results on this, Andi? Jan Engelhardt -- ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: 2.6.18-rc4 warning on arch/x86_64/boot/compressed/head.o 2006-08-15 13:11 ` Jan Engelhardt @ 2006-08-15 14:07 ` Andi Kleen 0 siblings, 0 replies; 7+ messages in thread From: Andi Kleen @ 2006-08-15 14:07 UTC (permalink / raw) To: Jan Engelhardt; +Cc: Andi Kleen, Keith Owens, linux-kernel > > Any results on this, Andi? I haven't tried, since I asked for a tested patch. -Andi ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2006-08-15 14:07 UTC | newest] Thread overview: 7+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2006-08-08 2:47 2.6.18-rc4 warning on arch/x86_64/boot/compressed/head.o Keith Owens 2006-08-08 2:55 ` Andi Kleen 2006-08-09 6:26 ` Jan Engelhardt 2006-08-09 7:09 ` Andi Kleen 2006-08-10 7:23 ` Jan Engelhardt 2006-08-15 13:11 ` Jan Engelhardt 2006-08-15 14:07 ` Andi Kleen
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