Hello,
I have a one question.
If I have to add additional external flag on my external kernel module source during compilation with KBUILD.
lest say I have one kernel module file hello.c
and I want to add one flag -D testdebug.
suppose this is my makefile.
obj-m += hello.o
all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
where I can add this flag.
Any help will be appreciated.
Thanks and Regards
----- Original Message ----
From: murtuja bharmal <[email protected]>
To: Sam Ravnborg <[email protected]>
Sent: Wednesday, 28 November, 2007 11:30:59 PM
Subject: Re: Linux 2.6 kernel module compilation without using KBUILD
> Try disabling Module version support - then you do
> not
> see the .tmp_<modulename>.o
> When you have understood this simpler case you can
> move
> on and try enabling module versioning.
>
> But again - you really do not need to understand all
> this
> kernel internal stuff to build a module.
> If your real goal is to build a module without
> use of kbuild you are on the wrong track.
>
> Please enligthing us why you need all this deep
> internal
> knowledge to build your module and we may be able to
> tell
> you how to use kbuild top do so.
>
> What you are heading at now looks like waste of time
> for all parties.
>
> Sam
>
Hello sam,
Thanks for your time.
Any way, we already had a lot discussion.
It just matter of interest nothing else.
Actually it is just a curiosity to know little bit
Internals of KBUILD and module versioning.
You can say, it is my bad habit when I start work on
something.
I want to understand it from base.
Unfortunately this time I didn’t get much information
from google.
Neither from kernel documentation.
I don’t have any issue on using KBUILD.
Sorry again.
Thanks for your suggestion and view.
Murtuja Bharmal
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On Thu, Jan 03, 2008 at 01:45:32PM +0530, murtuja bharmal wrote:
> Hello,
>
> I have a one question.
> If I have to add additional external flag on my external kernel module source during compilation with KBUILD.
> lest say I have one kernel module file hello.c
> and I want to add one flag -D testdebug.
>
> suppose this is my makefile.
>
> obj-m += hello.o
> all:
> make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
> clean:
> make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
>
> where I can add this flag.
>From Documentation/kbuild/makefile.txt:
--- 3.7 Compilation flags
ccflags-y, asflags-y and ldflags-y
The three flags listed above applies only to the kbuild makefile
where they are assigned. They are used for all the normal
cc, as and ld invocation happenign during a recursive build.
Note: Flags with the same behaviour were previously named:
EXTRA_CFLAGS, EXTRA_AFLAGS and EXTRA_LDFLAGS.
They are yet supported but their use are deprecated.
ccflags-y specifies options for compiling C files with $(CC).
Example:
# drivers/sound/emu10k1/Makefile
ccflags-y += -I$(obj)
ccflags-$(DEBUG) += -DEMU10K1_DEBUG
Sam