[OE-core] what means PROV_class-native = ""?

[Saul Wold]

On 01/18/2013 01:45 PM, Martin Jansa wrote:
> On Fri, Jan 18, 2013 at 04:35:34PM -0500, Robert P. J. Day wrote:
>>
>>    perusing oe-core for examples to demonstrate the concept of
>> "PROVIDES =", and i ran across this in recipes-devtools/dpkg/dpkg.inc:
>>
>> PROV = "virtual/update-alternatives"
>> PROV_class-native = ""
>
> PROV is variable with no special meaning
> class-native is standard override for native recipe (like
> virtclass-native was before).
>
>> PROVIDES += "${PROV}"
>>
>>    i'm not sure what to make of that -- what's the purpose of assigning
>> to PROV, then subsequently assigning to PROVIDES, but with that
>>
>> PROV_class-native = ""
>>
>> line in between?  i did a grep and saw nothing else like it throughout
>> oe-core.
>>
I believe that idea is since it's PROVIDES += , not a straight 
assignment like = it's not a simple to override with the +=, so for the 
target case PROVIDE the virtual/u-a, but not for the native case of that 
package.

If it was a straight assignment (using =) the ${PROV} would not be needed.

Sau!

>> rday
>>
>> --
>>
>> ========================================================================
>> Robert P. J. Day                                 Ottawa, Ontario, CANADA
>>                          http://crashcourse.ca
>>
>> Twitter:                                       http://twitter.com/rpjday
>> LinkedIn:                               http://ca.linkedin.com/in/rpjday
>> ========================================================================
>>
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