nixCraft

amimargo · #1 (**permalink**) 06-28-2007, 11:22 AM

Hello friends
I use the following lines many times in makefile - while building kernel module-
......
obj-m = hello.o
..........

where hello.o is my kernel module name.

Can anybody explain me why ' obj-m= ' is used ? I tried to find out in Linux Device Driver Book.But the book only says ' ...using gcc make extension... ' .
If anybody has any idea please explain .

nixcraft · #2 (**permalink**) 06-29-2007, 01:42 AM

It means build driver called hello.ko (2.6.xx kernel) / hello.o (2.4.xx kernel).

obj = object
m = module or driver

Let me know if you need any further assistance

amimargo · #3 (**permalink**) 06-29-2007, 10:15 AM

Quote:

Originally Posted by nixcraft

It means build driver called hello.ko (2.6.xx kernel) / hello.o (2.4.xx kernel).

obj = object
m = module or driver

Let me know if you need any further assistance

Still i could not understand.How the make interpret the rule.Could you say details?And what is the make gcc extention by which it is possible ?

rockdalinux · #4 (**permalink**) 07-05-2007, 09:54 PM

Quote:

Originally Posted by amimargo

Still i could not understand.How the make interpret the rule.Could you say details?And what is the make gcc extention by which it is possible ?

obj-m is a list of what kernel modules to build. The .o and other objects will be automatically built from the corresponding .c file (no need to list the source files explicitly).