Re: [PATCH] [media] v4l2-pci-skeleton: Only build if PCI is available

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On Tue, Aug 26, 2014 at 12:20:54PM -0700, Randy Dunlap wrote:
> On 08/26/14 10:25, Mark Brown wrote:

> > index d58101e788fc..65a351d75c95 100644
> > --- a/Documentation/video4linux/Makefile
> > +++ b/Documentation/video4linux/Makefile
> > @@ -1 +1 @@
> > -obj-m := v4l2-pci-skeleton.o
> > +obj-$(CONFIG_VIDEO_PCI_SKELETON) := v4l2-pci-skeleton.o
> > diff --git a/drivers/media/v4l2-core/Kconfig b/drivers/media/v4l2-core/Kconfig

> > +config VIDEO_PCI_SKELETON
> > +	tristate "Skeleton PCI V4L2 driver"
> > +	depends on PCI && COMPILE_TEST

> 	               && ??  No, don't require COMPILE_TEST.

That's a very deliberate choice.  There's no reason I can see to build
this code other than to check that it builds, it's reference code rather
than something that someone is expected to actually use in their system.  
This seems like a perfect candidate for COMPILE_TEST.

> 		However, PCI || COMPILE_TEST would allow it to build on arm64
> 		if COMPILE_TEST is enabled, guaranteeing build errors.
> 		Is that what should happen?  I suppose so...

No, it's not - if it's going to depend on COMPILE_TEST at all it need to
be a hard dependency.

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