Re: [PATCHv2 01/13] systemtap: remove usage of FILESPATH

["Petter Mabäcker" <petter@technux.se>]

On 05/11/2014 02:13 PM, Richard Purdie wrote:
> On Sun, 2014-05-11 at 00:31 +0200, petter@technux.se wrote:
>> 2014-05-10 18:58 skrev Khem Raj:
>>
>>> On Sat, May 10, 2014 at 1:05 AM, Petter Mabäcker <petter@technux.se>
>>> wrote:
>>>
>>>> +FILESEXTRAPATHS_prepend := "${THISDIR}/systemtap:"
>>> would something like
>>>
>>> FILESEXTRAPATHS =. "${FILE_DIRNAME}/systemtap:"
>>>
>>> avoid the prepend and immediate evaluation
>> I guess someone with deep bitbake knowledge can answer this better. But
>> as far as I understand, you should always use immediate evaluation when
>> using THISDIR, to be extra safe. Not sure if it's more safe to use
>> FILE_DIRNAME if you want to avoid immediate expanding when using
>> FILESEXTRAPATHS?
>>
>> The bitbake documentations says:
>>
>> "The operators "_append" and "_prepend" differ from the operators ".="
>> and "=." in that they are deferred until after parsing completes rather
>> than being immediately applied."
>>
>> Not sure if above means that "=." will also immediately expand
>> variables or not?
> They're not.
>
>> Personally I have always used FILESEXTRAPATHS_prepend :=
>> "${THISDIR}/<somename>:" like the yocto documentation recommends. But
>> sure if you can avoid immediate expanding in FILESEXTRPATHS, that would
>> mean a tiny optimization. In that case perhaps the documentation should
>> be updated as well. Looking in meta-layer both methods seems to be used.
> What Khem means is that in the case we know we're in the .bb file
> directory, we can use FILE_DIRNAME instead of using :=.
>
> Why? FILE_DIRNAME is defined as:
>
> conf/bitbake.conf:FILE_DIRNAME = "${@os.path.dirname(d.getVar('FILE'))}"
>
> FILE will point to the .bb file.
>
> Cheers,
>
> Richard
>
>
>
Ok, that makes sense. I will send up a new changeset using this method 
instead.

BR,
Petter