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From: Gerd Knorr <kraxel@bytesex.org>
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Subject: Re: External compilation
Date: 10 Jun 2002 11:15:49 GMT
Organization: SuSE Labs, =?ISO-8859-1?Q?Au=DFenstelle?= Berlin
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John Levon wrote:
>  
>  Is there any good example code for compiling a kernel module
>  externally, that works for modversions etc. on 2.2, 2.4, and 2.5,
>  and does the right thing (including Rules.make) ?
>  
>  I'm having an awful time working out the exact incantations.

Here is a stripped down version of what I use for bttv currently.

  Gerd

==============================[ Makefile ]==============================
# where the kernel sources are located
KDIR := /lib/modules/$(shell uname -r)/build
#KDIR := /work/bk/2.5/build

# kernel version
KVER := $(shell ./uts-release $(KDIR))
MDIR := /lib/modules/$(KVER)/kernel/drivers/media/video

export-objs	:= bttv-if.o video-buf.o
list-multi	:= bttv.o
bttv-objs	:= bttv-driver.o bttv-cards.o bttv-risc.o bttv-if.o bttv-vbi.o

obj-m		:= video-buf.o bttv.o

multi-m		:= $(filter $(list-multi), $(obj-m))
int-m		:= $(sort $(foreach m, $(multi-m), $($(basename $(m))-objs)))

EXTRA_CFLAGS=-g -Wmissing-prototypes -Wstrict-prototypes

here:
	DIR=`pwd`; (cd $(KDIR); make SUBDIRS=$$DIR modules)

include $(KDIR)/Rules.make

bttv.o: $(bttv-objs)
	$(LD) -r -o $@ $(bttv-objs)

==============================[ uts-release ]==============================
#! /bin/sh
cat <<-EOF | cpp -P -I$1/include | grep '"' | cut -d'"' -f2
	#include <linux/version.h>
	UTS_RELEASE
EOF