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# Makfile assignments:
# := value at right is expanded and assigned at declaration time
# = value at right is expanded only when it is used, hence it is a reference
# ?= value at right is assigned only if the variable doesn't have a value
#
# run following to compile with debug options
# $ DEBUG=1 make
ifneq ($(DEBUG),)
DEBUG_FLAGS = -O0 -g -DHELLO_DEBUG
endif
# see Documentation/kbuild/makefiles.txt
EXTRA_CFLAGS += $(DEBUG_FLAGS)
ifneq ($(KERNELRELEASE),)
# call from kernel build system
# objects that are part of hello module (hello.o)
#hello-objs += main.o debug.o
hello-y += main.o debug.o
# .ko module to be created
obj-m := hello.o
# normal makefile, not kbuild
else
KERNELDIR ?= /lib/modules/$(shell uname -r)/build
# '-C' changes the dir
# '-M' causes the the kernel's toplevel Makefile to move back into this dir
# before trying to build 'modules' target
# and it informs kbuild that an external module is being built
all:
make -C $(KERNELDIR) KCPPFLAGS="-I$(CURDIR)" M=$(PWD) modules
endif
kclean:
make -C $(KERNELDIR) M=$(PWD) clean
# if above gives perm problem for normal user, try this
kcleanu:
make -C $(KERNELDIR) SUBDIRS=$(CURDIR) clean
clean:
@rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions Module.symvers modules.order
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