Messages in this thread | | | Date | Thu, 15 May 2008 21:19:26 +0200 | From | Jiri Slaby <> | Subject | Re: crossbuild fails in modpost |
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Sam Ravnborg napsal(a): > On Thu, May 15, 2008 at 07:35:39PM +0200, Sam Ravnborg wrote: >> On Thu, May 15, 2008 at 07:12:34PM +0200, Jiri Slaby wrote: >>> Well, let's fix sam's email. >>> >>> Jiri Slaby napsal(a): >>>> Hi, >>>> >>>> probably >>>> 4ce6efed48d736e3384c39ff87bda723e1f8e041 >>>> kbuild: soften modpost checks when doing cross builds >>>> >>>> causes build failures on x86_64 kernel build on 32 bit machine: >>>> >>>> make -f /local/xslaby/hid/scripts/Makefile.modpost >>>> YYYYYYYYYYYYYY x86_64 x86_64 >>>> scripts/mod/modpost -m -a -o /local/xslaby/buhid/Module.symvers -S >>>> -K /local/xslaby/buhid/Module.markers -M >>>> /local/xslaby/buhid/Module.markers -s >>>> XXXXXXXXXXXXXXXXXX 20: 0 (2), 4 (4), 8 (4), 12 (8) >>>> FATAL: drivers/hid/hid-apple: sizeof(struct hid_device_id)=20 is not a >>>> modulo of the size of section __mod_hid_device_table=648. >>>> Fix definition of struct hid_device_id in mod_devicetable.h >>>> make[2]: *** [__modpost] Error 1 >>>> make[1]: *** [modules] Error 2 >>>> make: *** [sub-make] Error 2 >>>> >>>> after sticking echo into: >>>> __modpost: $(modules:.ko=.o) FORCE >>>> + @echo YYYYYYYYYYYYYY $(KBUILD_BUILDHOST) $(ARCH) >>>> $(call cmd,modpost) $(wildcard vmlinux) $(filter-out FORCE,$^) >>>> >> Your machine claims it is a x86_64 and you are building for a x86_64 >> according to the following line: >>>> YYYYYYYYYYYYYY x86_64 x86_64 >> So it looks to me that you are building for 64 bit on a 64 bit machine. >> So when you write: >> on x86_64 kernel build on 32 bit machine: >> >> I assume you try to say that your HOSTCC is 32 bit and your >> kernel cc is 64 bit (or something similar). >> >> The commit you reference loosen up the check so we do not do the >> check if we _know_ that the host and the target system differs. >> The only thing I can imagine right now to solve your issue would >> be to skip the check if we do not use the same gcc for target and host?
Well, the compiler is the same, but it's told to compile the kernel with -m64. It runs on x86_64 kernel and i386 userspace. It's debian i386 gcc package which understands x86_64 objects too. No SUBARCH option, it seems to default to x86_64.
> So something like this (entirely untested): > > --- a/scripts/Makefile.modpost > +++ b/scripts/Makefile.modpost > @@ -65,7 +65,7 @@ modules := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o))) > # Stop after building .o files if NOFINAL is set. Makes compile tests quicker > _modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules)) > > -ifneq ($(KBUILD_BUILDHOST),$(ARCH)) > +ifneq ($(CC),$(HOSTCC))
gcc gcc :)
> cross_build := 1 > endif
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