linux-kernel - Re: Re: how about KBUILD

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Date:	Tue, 3 Aug 2010 12:00:07 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	hacklu <embedway.linux@...il.com>
Cc:	Am?rico Wang <xiyou.wangcong@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Re: how about KBUILD_MODNAME

On Tue, Aug 03, 2010 at 05:35:40PM +0800, hacklu wrote:
> 
> I am compiling the boardcom's driver now.
> the driver had defined EXTRA_CFLAGS = -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) 
> in the a.makefile.
> and the a.makefile was included by b.makefile.
> when in the b.makefile,
> there is this command.
>  $(CC) $(DEPS_OPT) $(CFLAGS) $(EXTRA_CFLAGS) -o $@ -c $< ;) 
> 
> I had add "echo $(EXTRA_CFLAGS)" before this line;but returns NULL;
> 
> so I suspicion the $(EXTRA_CFLAGS) hasn't been work.
> 
> I aslo try to add "export EXTRA_CFLAGS" in a.makefile,but it doesn't work either.
> 
> the problem has puzzled me for some days.
> 
> help me please~~


It looks like the driver uses the old 2.4 way to define a Makefile.
This will not work with 2.6.

What you need to do is to define a Makefile (*) like you would
if the driver was included in the kernel and then build
it using the following command:

make -C path/to/kernel/ M=`pwd`

The kernel shall be built before you do this as the method uses
information from the buitl kernel.

(*) The Makefile may not refer to new CONFIG_ symbols.
So it likely looks like this:

obj-m := foo.o bar.o

Do not be suprised that the Makefile becomes much much simpler - this is expected.

	Sam
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