CODEWITHSUNDEEP
clinuxmakefilelinux-kernelkernel-module
JC1
JC1

Reputation: 686

Error compiling kernel module with two source files

I am trying to compile a kernel module that has two .c files. My Makefile is the following

module-y: dummy.o library.o  
obj-m += module.o

default:
    make -C /lib/modules/`uname -r`/build M=$(PWD) modules

When I run this I get

cc    -c -o dummy.o dummy.c
dummy.c:3:24: fatal error: linux/init.h: No such file or directory

It seems the Makefile doesn't know where to find the headers now.

I have tried using CFLAGS to add include directories, but there are so many of them that it becomes tedious and hard to do (haven't managed to make it work).

I would like to generate these two .o files using the include directories that are (magically) used when using a single .c file. Everything works fine in that case.

How to fix the include directories when using two source files?

Upvotes: 0

Views: 644

Answers (1)

user3629249
user3629249

Reputation: 16540

I wrote the Makefile like the following, and it worked:

ifneq ($(KERNELRELEASE),)
# kbuild part of makefile
obj-m  := module.o
module-y := library.o dummy.o

else
# normal makefile
KDIR ?= /lib/modules/`uname -r`/build

default:
        $(MAKE) -C $(KDIR) M=$$PWD modules
endif

Upvotes: 1

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