makefile : missing separator

Question

#kernel build system and can use its lanauge
ifneq($(KERNELRELEASE),)
 obj-m:=helloworld.o
else
 KDIR:= /lib/modules/2.6.33.3-85.fc13.i686/build
all:
 make -C $(KDIR) M=$(PWD) modules
clean:
 rm -f *.ko *.o *.mod.o *.mod.c *.symvers
endif

The error is:

makefile:2:*** missing separator . stop

but for the ifneq($(KERNELRELEASE),) , if I add a tab before, I get another error:

makefile:2: ***commands commence before first target. stop

Answer 1

There must be a space between ifneq and ( .

The TAB prefix means that it is a shell command, so be sure that the shell commands ( make and rm ) begin with TAB, and all other lines such as ifneq do not begin with TAB.

Answer 2

Make is complaining that the second line doesn't start with a tab. Your IDE/texteditor may be saving the file using spaces as equivalent to a tab character. Either configure the IDE to use the tab character, or use a simple editor like vim or nano and replace the leading white space on the second line with a tab.

Answer 3

在obj-m:之前检查obj-m:和KDIR:等。你的标签是否作为空格插入？

Answer 4

你错过了条件ifneq的第二部分（$（KERNELRELEASE），）需要在逗号之后有一些东西，比如“2.6.17”（例如）。