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From: Axel Weiss <aweiss@informatik.hu-berlin.de>
Organization: Humboldt-Universitaet zu Berlin
To: Sam Ravnborg <sam@ravnborg.org>
Subject: Re: compiling external modules
Date: Sat, 17 Apr 2004 01:24:33 +0200
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On Friday 16 April 2004 22:51, Sam Ravnborg wrote:
> On Fri, Apr 16, 2004 at 10:09:56PM +0200, Axel Weiss wrote:
> > 2. 2.6 compilation requires root privileges for compilation, 2.4 does
> > not.
>
> I never ever compile as root - so something is broken here.

Oh, yes! This is the old weird thing! SuSE uses to install kernel sources
in /usr/src, and I blindly followed :( fixed now :).

So, finally, we have a nice Makefile suitable for 2.4 and 2.6 (>= 2.6.6) kernels:

#/***************************************************************************
# * ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? *
# * ? This program is free software; you can redistribute it and/or modify ?*
# * ? it under the terms of the GNU General Public License as published by ?*
# * ? the Free Software Foundation; either version 2 of the License, or ? ? *
# * ? (at your option) any later version. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? *
# * ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? *
# ***************************************************************************/
#
# ?(C) 2004 by Axel Weiss (aweiss@informatik.hu-berlin.de)
#
#
# ?Template Makefile for external module compilation
#
#  replace <mod-name> with the prefix of the target module
#  replace <mod-object-list> with the list of object files to be linked together
#  replace <mod-export-list> with all symbol-exporting object filenames
#  additionally specify EXTRA_CFLAGS, if needed
#

KDIR ? ? ?:= /lib/modules/$(shell uname -r)/build
PWD ? ? ? := $(shell pwd)
KERNEL_24 := $(if $(wildcard $(KDIR)/Rules.make),1,0)

obj-m ? ? ? ? ? := <mod-name>.o
<mod-name>-objs := <mod-object-list>

.PHONY: all clean modules_install

ifeq ($(KERNEL_24),0)
ifeq ($(KERNELRELEASE),)
all:
	$(MAKE) -C $(KDIR) M=$(PWD)
clean modules_install:
	$(MAKE) -C $(KDIR) M=$(PWD) $@
endif # ifeq ($(KERNELRELEASE),)

else ?### ifeq ($(KERNEL_24),0)

ifneq ($(KERNELRELEASE),)

export-objs := <mod-export-list>

include $(KDIR)/Rules.make
adc64_bm.o: $(<mod-name>-objs)
	$(Q)$(LD) $(LD_RFLAG) -r -o $@ $(<mod-name>-objs)
else ?# ifneq ($(KERNELRELEASE),)
all:
	$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
modules_install:
	$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) $@
clean:
	rm -f *.ko *.o .*.cmd .*.o.flags *.mod.c
endif # ifneq ($(KERNELRELEASE),)
endif ### ifeq ($(KERNEL_24),0)
# end of Makefile Template

Regards, thanks for your helpful advice and

have a nice weekend,

Axel

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