# -*-makefile-*-## This file is part of the sample code for the book "Linux Device Drivers",# second edition. It is meant to be generic and is designed to be recycled# by other drivers. The comments should be clear enough.# It partly comes from Linux Makefile, and needs GNU make. <rubini@linux.it># TOPDIR is declared by the Makefile including this file.ifndef TOPDIR	TOPDIR = .endif# KERNELDIR can be speficied on the command line or environmentifndef KERNELDIR	KERNELDIR = /usr/src/linuxendif# The headers are taken from the kernel	INCLUDEDIR = $(KERNELDIR)/include# We need the configuration file, for CONFIG_SMP and possibly other stuff# (especiall for RISC platforms, where CFLAGS depends on the exact# processor being used).ifeq ($(KERNELDIR)/.config,$(wildcard $(KERNELDIR))/.config)	include $(KERNELDIR)/.configelse	MESSAGE := $(shell echo "WARNING: no .config file in $(KERNELDIR)")endif# ARCH can be speficed on the comdline or env. too, and defaults to this arch# Unfortunately, we can't easily extract if from kernel configuration# (well, we could look athe asm- symlink... don't know if worth the effort)ifndef ARCH  ARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \		-e s/arm.*/arm/ -e s/sa110/arm/)endif# This is useful if cross-compiling. Taken from kernel Makefile (CC changed)AS      =$(CROSS_COMPILE)asLD      =$(CROSS_COMPILE)ldCC      =$(CROSS_COMPILE)gccCPP     =$(CC) -EAR      =$(CROSS_COMPILE)arNM      =$(CROSS_COMPILE)nmSTRIP   =$(CROSS_COMPILE)stripOBJCOPY =$(CROSS_COMPILE)objcopyOBJDUMP =$(CROSS_COMPILE)objdump# The platform-specific Makefiles include portability nightmares.# Some platforms, though, don't have one, so check for existence firstARCHMAKEFILE = $(TOPDIR)/Makefile.$(ARCH)ifeq ($(ARCHMAKEFILE),$(wildcard $(ARCHMAKEFILE)))  include $(ARCHMAKEFILE)endif# CFLAGS: all assignments to CFLAGS are inclremental, so you can specify# the initial flags on the command line or environment, if needed.	CFLAGS +=  -Wall -D__KERNEL__ -DMODULE -I$(INCLUDEDIR)ifdef CONFIG_SMP	CFLAGS += -D__SMP__ -DSMPendif#Install dirVERSIONFILE = $(INCLUDEDIR)/linux/version.hVERSION     = $(shell awk -F\" '/REL/ {print $$2}' $(VERSIONFILE))INSTALLDIR = /lib/modules/$(VERSION)/misc