[yocto] [PATCH 6/9] distro: Factor out poky-common.inc from poky.conf

[Darren Hart]

On 12/21/2011 08:47 AM, Darren Hart wrote:
> 
> 
> On 12/21/2011 08:28 AM, Richard Purdie wrote:
>> On Wed, 2011-12-21 at 01:02 -0800, Darren Hart wrote:
>>> Prepare to add additional poky distro variants by factoring out
>>> assignments common to all poky* distros into poky-common.inc. Things
>>> like the naming schemes, mirrors, etc. are common, while dependencies
>>> and other things impacting image generation should be distro specific.
>>>
>>> Signed-off-by: Darren Hart <dvhart at linux.intel.com>
>>
>> Why doesn't something like:
>>
>> """
>> $meta-yocto/conf/distro$ cat poky-lsb.conf 
>> require conf/distro/poky.conf
>>
>> DISTRO = "poky-lsb"
>> DISTROOVERRIDES = "poky:linuxstdbase"
>> """
>>
>> work?
>>
>> Effectively the above takes poky but then customises it...
> 
> I seem to recall something about this being harder with tiny as it
> removes things rather than just extending. But I can't put recall
> exactly what the issue was (or if there was one). I shall try it this
> way if you prefer this approach. I felt the .inc approach provided a
> more explicit building block mechanism which seemed more intuitive and
> less prone to accidental inclusion. But, I don't feel strongly one way
> or the other.

Aha, now I remember. Consider things like the following, defined in
poky.conf:

DISTRO_FEATURES_append = " largefile opengl"

This one, not so bad, I can easily override it.

PREFERRED_VERSION_linux-yocto ?= "2.6.37+git%"
PREFERRED_VERSION_linux-yocto_qemux86 ?= "3.0%"
PREFERRED_VERSION_linux-yocto_qemux86-64 ?= "3.0%"
PREFERRED_VERSION_linux-yocto_qemuarm ?= "3.0%"
PREFERRED_VERSION_linux-yocto_qemumips ?= "3.0%"
PREFERRED_VERSION_linux-yocto_qemuppc ?= "3.0%"


All the above I could override.... but I'd rather be able to use the
default without having to override them. This pollutes my distro config
space unnecessarily in my opinion.

DISTRO_EXTRA_RRECOMMENDS += "kernel-module-af-packet"

Things like this are the kicker. I don't know of a way to remove just
what poky.conf appended to a variable, and not wipe out the rest of the
variable.

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel