谁能帮我解析一下这个MAKEFILE是怎么写的
# To build modules outside of the kernel tree, we run "make"
# in the kernel source tree; the Makefile these then includes this
# Makefile once again.
# This conditional selects whether we are being included from the
# kernel Makefile or not.
ifeq ($(KERNELRELEASE),)
# Assume the source tree is where the running kernel was built
# You should set KERNELDIR in the environment if it's elsewhere
KERNELDIR ?= /lib/modules/$(shell uname -r)/build
# The current directory is passed to sub-makes as argument
PWD := $(shell pwd)
modules:
$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
modules_install:
$(MAKE) -C $(KERNELDIR) M=$(PWD) modules_install
clean:
rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions
.PHONY: modules modules_install clean
else
# called from kernel build system: just declare what our modules are
obj-m := hello.o hellop.o seq.o jit.o jiq.o sleepy.o complete.o \
silly.o faulty.o kdatasize.o kdataalign.o
endif
////////////////////////////////////
ifeq ($(KERNELRELEASE),)是什么意思啊?最好谁能帮我讲讲整个MAKLE是怎么写的?
谢谢了
问题点数：100、回复次数：4Top
1 楼fierygnu（va_list）回复于 2006-03-20 14:47:35 得分 25
ifeq ($(KERNELRELEASE),)是判断变量KERNELRELEASE是否为空。
标准的gnu makefile文件。看gnu make文档：
http://www.gnu.org/software/make/manual/html_mono/make.htmlTop
2 楼arden1019（CSCUM）回复于 2006-03-21 10:47:14 得分 25
100分哪，我给你个中文的地方看看：）
http://www.china-askpro.com/msg22/qa83.shtmlTop
3 楼morpheus1977（）回复于 2006-03-23 14:39:34 得分 25
找个简单的makefile看看，然后遇到不懂就看看gnu make文档。
这年头，主要工作是修改makefile. 能看懂就好Top
4 楼goodboy1881（积木)(谁都别拦着我在水源升星）回复于 2006-03-23 15:41:31 得分 25
这有啥看不懂的？？确实没什么好说的。。。
这个make文件里面有几个目标
#编译一个module目标
modules:
$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
#安装module
modules_install:
$(MAKE) -C $(KERNELDIR) M=$(PWD) modules_install
#清理掉已经编译好的文件
clean:
$(MAKE) 是取MAKE变量的值，剩下的字迹翻译翻译就好了，特别简单。
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http://blog.csdn.net/goodboy1881Top
