[Buildroot] [PATCH] usbip: add a new package

[Yann E. MORIN <yann.morin.1998@free.fr>]

Tal, All,

On 2016-12-12 00:11 +0200, Tal Shorer spake thusly:
> On Mon, Dec 12, 2016 at 12:05 AM, Yann E. MORIN <yann.morin.1998@free.fr> wrote:
> > Tal, Arnout, All,
> >
> > On 2016-12-11 23:46 +0200, Tal Shorer spake thusly:
> >> On Sun, Dec 11, 2016 at 9:59 PM, Arnout Vandecappelle <arnout@mind.be> wrote:
> > [--SNIP--]
> >> >  However, doesn't something like this work? Or is it considered too much of a hack?
> >> >
> >> > # Before v3.17 it was in staging.
> >> > # USBIP_SITE is only used inside rules, after linux has already been extracted.
> >> > USBIP_SITE = $(wildcard \
> >> >         $(LINUX_DIR)/tools/usb/usbip \
> >> >         $(LINUX_DIR)/drivers/staging/usbip/userspace)
> >> It doesn't,
> >
> > Weird, it does work here:
> >
> >     USBIP_SITE= $(wildcard \
> >         $(LINUX_DIR)/tools/usb/usbip \
> >         $(LINUX_DIR)/drivers/staging/usbip/userspace)
> >     USBIP_SITE_METHOD = local
> >     USBIP_PATCH_DEPENDENCIES = linux
> >
> >     define USBIP_CONFIGURE_CMDS
> >         @echo 'USBIP_SITE="$(USBIP_SITE)"'
> >     endef
> >
> >     $(eval $(generic-package))
> >
> > And then:
> >
> >     $ make usbip-configure
> >     [--SNIP--]
> >     USBIP_SITE="/home/ymorin/dev/buildroot/O/build/linux-4.8.13/tools/usb/usbip"
> >
> > Quid? ;-)
> Notice how it says "Extracting" in the "snip". That's a hint that it
> doesn't understand it needs to rsync.

Oh dang, stupid me...

> In the top Make, we can find:
> ########
> include $(sort $(wildcard package/*/*.mk))
> 
> include boot/common.mk
> include linux/linux.mk
> include fs/common.mk
> ########
> so pkg-autotools evaluates the wildcard before LINUX_DIR is defined

And contrary to what Arnout said, _SITE *is* evaluated outside of rules,
but soon-enough in pkg-generic.mk, before LINUX_DIR had a change to be
defined.

Good catch, Tal.

So, back to squarte one. You have two options, then:

  - adding a kconfig option, like your latest patch provides,

  - not supporting kernels <= 3.16, like you also suggested.

I'm fine with either solution.

Regards,
Yann E. MORIN.

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