Makefile错误解决方法

 在makefile中写入：

ifneq ($(KERNELRELEASE),)
MODULE_NAME = hellomodule
$(MODULE_NAME)-objs := hello.o
obj-m := $(MODULE_NAME).o
else
KERNEL_DIR = /lib/modules/`uname -r`/build
MODULEDIR := $(shell pwd)

.PHONY: modules
default: modules

modules:	
	make -C $(KERNEL_DIR) M=$(MODULEDIR) modules

clean distclean:
	rm -f *.o *.mod.c .*.*.cmd *.ko
	rm -rf .tmp_versions
endif

hechao@ubuntu:/opt/driver$ make
Makefile:16: *** missing separator.  Stop.
 

makefile的命令行，开头必须用tab键。将

modules:    

    make -C $(KERNEL_DIR) M=$(MODULEDIR) modules

clean distclean:

    rm -f *.o *.mod.c .*.*.cmd *.ko

    rm -rf .tmp_versions

里面的命令行左顶格，再用tab键开头。

重新执行 make

hechao@ubuntu:/opt/driver$  make
make -C /lib/modules/`uname -r`/build M=/opt/driver modules
make[1]: Entering directory `/usr/src/linux-headers-4.4.0-131-generic'
Makefile:697: Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: -fstack-protector not supported by compiler
mkdir: cannot create directory ‘/opt/driver/.tmp_versions’: Permission denied
  CC [M]  /opt/driver/hello.o
Assembler messages:
Fatal error: can't create /opt/driver/.tmp_hello.o: Permission denied
In file included from include/linux/kobject.h:21:0,
                 from include/linux/module.h:17,
                 from /opt/driver/hello.c:1:
include/linux/sysfs.h: In function ‘sysfs_get_dirent’:
include/linux/sysfs.h:523:2: warning: pointer targets in passing argument 2 of ‘kernfs_find_and_get’ differ in signedness [-Wpointer-sign]
  return kernfs_find_and_get(parent, name);
  ^
In file included from include/linux/sysfs.h:15:0,
                 from include/linux/kobject.h:21,
                 from include/linux/module.h:17,
                 from /opt/driver/hello.c:1:
include/linux/kernfs.h:433:1: note: expected ‘const char *’ but argument is of type ‘const unsigned char *’
 kernfs_find_and_get(struct kernfs_node *kn, const char *name)
 ^
make[2]: *** [/opt/driver/hello.o] Error 2
make[1]: *** [_module_/opt/driver] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-4.4.0-131-generic'
make: *** [modules] Error 2
 

执行  sudo make 就好了。