RE: [media-ctl PATCH 2/3] Just include kernel headers

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Hi Laurent,

> -----Original Message-----
> From: Laurent Pinchart [mailto:laurent.pinchart@xxxxxxxxxxxxxxxx]
> Sent: Friday, July 30, 2010 9:24 AM
> To: Aguirre, Sergio
> Cc: linux-media@xxxxxxxxxxxxxxx
> Subject: Re: [media-ctl PATCH 2/3] Just include kernel headers
> 
> Hi Sergio,
> 
> On Friday 30 July 2010 16:10:08 Aguirre, Sergio wrote:
> > On Friday 30 July 2010 8:45 AM Laurent Pinchart wrote:
> > > On Wednesday 14 July 2010 18:17:25 Sergio Aguirre wrote:
> > > > We shouldn't require full kernel source for this.
> > >
> > > That's right in theory, but I then get
> > >
> > > $ make KDIR=/home/laurent/src/arm/kernel/
> > > arm-none-linux-gnueabi-gcc -O2 -Wall -fpic -I. -
> > > I/home/laurent/src/arm/kernel//include    -c -o media.o media.c
> > > In file included from /opt/cs/arm-2009q1/bin/../arm-none-linux-
> > > gnueabi/libc/usr/include/asm/types.h:4,
> > >                  from
> > > /home/laurent/src/arm/kernel//include/linux/types.h:4,
> > >                  from
> > > /home/laurent/src/arm/kernel//include/linux/videodev2.h:66,
> > >                  from media.c:31:
> > > /home/laurent/src/arm/kernel//include/asm-generic/int-ll64.h:11:29:
> > > error: asm/bitsperlong.h: No such file or directory
> > > make: *** [media.o] Error 1
> > >
> > > when building against a kernel tree.
> >
> > KDIR doesn't exist anymore.
> >
> > By the result of your log, I don't see how that value got passed into
> the
> > makefile... Are you sure you applied the patch correctly?
> 
> I haven't, I've just removed the arch include dir from KDIR in the
> Makefile.
> The end result is the same.

Hmm..

I think this is expected, since the kernel headers folder generated with

make ARCH=arm INSTALL_HDR_PATH=<your-fs-root> headers_install

Is not the same as just reading the kernel source include folder.

Some #ifdef get resolved depending on the arch, and the headers are
"rebuilt". See : Documentation/make/headers_install.txt

So, I guess it's not as simple as just removing the arch include folder.

Regards,
Sergio

> 
> --
> Regards,
> 
> Laurent Pinchart
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