[yocto] Use of BBPATH in a layer.conf file.

[Scott Garman]

On 12/03/2012 09:43 AM, Tomas Frydrych wrote:
> On 02/12/12 22:51, Scott Garman wrote:
>> Robert Day has brought up an inconsistency in the way we append to
>> BBPATH within a couple of our layer.conf files.
>>
>> In meta-hob, meta-yocto-bsp, and meta-intel, we do:
>>
>> BBPATH := "${BBPATH}:${LAYERDIR}"
>>
>> but in meta-yocto, we do:
>>
>> BBPATH := "${LAYERDIR}:${BBPATH}"
>>
>> Unless someone explains to me that it's necessary to use this different
>> ordering in meta-yocto's layer.conf, I will submit a patch to make this
>> more consistent.
>
> This meta-yocto setup is intentional (there was thread about that a
> while back). meta-yocto is a distro layer, and for any distro layer it
> is reasonable to enforce its own precedence over any other layers is may
> use, and meta-yocto chooses to do this. Non-distro layers, including all
> bsp layers, are expected to always use an append operation so that they
> can be stacked together.

Thanks for the concise explanation.

Scott

-- 
Scott Garman
Embedded Linux Engineer - Yocto Project
Intel Open Source Technology Center