- Question:
This is my makefile:
all: hello.o
hello.exe: hello.o
gcc -o hello.exe hello.o
hello.o: hello.c
gcc -c hello.c
clean:
rm hello.o hello.exe
When I try to make clean or make make, I get this error:
:makefile:4: *** missing separator. Stop.
How can I fix it?
makefile has a very stupid relation with tabs, all actions of every rule are identified by tabs ...... and No 4 spaces don't make a tab, only a tab makes a tab...
to check I use the command cat -e -t -v makefile_name
It shows the presence of tabs with ^I and line endings with $ both are vital to ensure that dependencies end properly and tabs mark the action for the rules so that they are easily identifiable to the make utility.....
Example:
Kaizen ~/so_test $ cat -e -t -v mk.t
all:ll$ ## here the $ is end of line ...
$
ll:ll.c $
^Igcc -c -Wall -Werror -02 c.c ll.c -o ll $@ $<$
## the ^I above means a tab was there before the action part, so this line is ok .
$
clean :$
m -fr ll$
## see here there is no ^I which means , tab is not present ....
## in this case you need to open the file again and edit/ensure a tab
## starts the action part
hope this helps !!
makefile中要在shell中执行的命令必须要用tab开头，而make语句用空格即可
例:
第8行和第10行用tab
ifneq ($(KERNELRELEASE),)
obj-m += module.o
else
PWD := $(shell pwd)
KVER := $(shell uname -r)
KDIR := /lib/modules/$(KVER)/build
all:
$(MAKE) -C $(KDIR) M= $(PWD)
clean:
rm -rf *.o *.mod.c *.ko *.symvers *.order *.makers
endif
其他问题，如编码格式，中文、日文字符，文件开头有BOM标记等
查看前20个字符，每行显示10个字符:
$ xxd -l 20 -c 10 makefile
00000000: 616c 6c3a 2068 656c 6c6f all: hello
0000000a: 2e6f 0a0a 6865 6c6c 6f2e .o..hello.