2006-03-21 11:21:34

by cranium2003

Subject: Makefile problem

Hi,
I have some Makefile questions
1)Why a kernel module in 2.6 kernel cannot be compiled
with single gcc command? Why it requires Makefile in
current directory so that i can use Makefile?

2) why following command used to compile 2.4 kernel
module fails on 2.6 kernel
gcc -D__KERNEL__ -DMODULE -DLINUX -O2 -Wall
-Wstrict-prototypes -I/lib/modules/`uname
-r`/build/include -c -o example.ko example.c

3) Is that because of gcc cannot create .ko file??
then what header changes occurred from .o to .ko
module implementaion?

Thanks & Regards,
cranium



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2006-03-21 11:42:21

by Arjan van de Ven

Subject: Re: Makefile problem

On Tue, 2006-03-21 at 03:21 -0800, cranium2003 wrote:
> Hi,
> I have some Makefile questions
> 1)Why a kernel module in 2.6 kernel cannot be compiled
> with single gcc command? Why it requires Makefile in
> current directory so that i can use Makefile?
>
> 2) why following command used to compile 2.4 kernel
> module fails on 2.6 kernel
> gcc -D__KERNEL__ -DMODULE -DLINUX -O2 -Wall
> -Wstrict-prototypes -I/lib/modules/`uname
> -r`/build/include -c -o example.ko example.c

because it's broken and isn't using the same CFLAGS as the kernel is.
Read Documentation/kbuild/*

You *HAVE* to use the same CFLAGS as the rest of the kernel.