[yocto] Help with DISTRO settings

[Khem Raj]

> On Jul 25, 2016, at 10:00 PM, Paul Eggleton <paul.eggleton at linux.intel.com> wrote:
> 
> On Mon, 25 Jul 2016 20:34:32 Khem Raj wrote:
>>> On Jul 25, 2016, at 8:31 PM, Edward Wingate <edwingate8 at gmail.com> wrote:
>>> 
>>> On Mon, Jul 25, 2016 at 1:27 AM, Nicolas Dechesne
>>> 
>>> <nicolas.dechesne at linaro.org> wrote:
>>>> hmm. you shouldn't set DISTRO in conf/layer.conf, that doesn't sound
>>>> right. DISTRO needs to be set in local.conf (or any of the other build
>>>> specific conf files).
>>> 
>>> I agree, I don't know why I had it in conf/layer.conf.  Just
>>> beginner's mistake.
>>> 
>>> I moved DISTRO to local.conf (changed the existing DISTRO ?= "poky" to
>>> DISTRO ?= "mydistro") and it still works.  But if I remove DISTRO from
>>> conf/distro/mydistro.conf, DISTRO will revert to "poky", even though
>>> it is set to my "mydistro" in local.conf.  So it seems I have to have
>>> it in both places.
>> 
>> in your mydistro.conf you should first set the settings that you want to
>> customize then include conf/distro/poky.conf not other way around. May be
>> we should change poky.conf to use ??= so the substitution happens at the
>> end of parsing. but thats for another time.
> 
> I'm clearly missing something - why must it be done that way around? If you
> were to set the values you want *after* the include/require then that should
> work just fine, and would be the way I would recommend doing it - it's also
> the way poky-lsb distro does it.
> 
> One thing to note is that poky.conf itself sets DISTRO, mostly for historical
> reasons I believe. Thus if you do include/require poky.conf then you may wish
> to set DISTRO back to whatever it should be and you'd have to do that after
> the include/require, not before it.

Those are valid assertions. However user is changing DISTRO ?= “poky”
which will take effect if DISTRO is unset before above is parsed.

> 
> Another thing to consider is that any _poky overrides will only be applied if
> DISTRO = "poky", thus include/require of poky.conf won't incorporate those
> into your custom distro. You can set DISTROOVERRIDES to include "poky" to
> counter this. In practice though there aren't too many of these - in fact I
> can only see one in the psplash recipe.
> 
> Cheers,
> Paul
> 
> --
> 
> Paul Eggleton
> Intel Open Source Technology Centre

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 204 bytes
Desc: Message signed with OpenPGP using GPGMail
URL: <http://lists.yoctoproject.org/pipermail/yocto/attachments/20160725/9ff018ff/attachment.pgp>