[oe] COMPATIBLE_MACHINE

[Chris Larson]

On Fri, Apr 20, 2012 at 7:15 AM, Gary Thomas <gary at mlbassoc.com> wrote:
> On 2012-04-20 08:04, Chris Larson wrote:
>>
>> On Fri, Apr 20, 2012 at 6:20 AM, Gary Thomas<gary at mlbassoc.com>  wrote:
>>>
>>> I'm writing a .bbappend for a recipe which contains a COMPATIBLE_MACHINE
>>> pattern like this:
>>>  COMPATIBLE_MACHINE = "(machine1|machine2|machine3)"
>>>
>>> Is there a way my .bbappend file can add to this pattern?  I don't want
>>> to disturb what's there, just add my machine as well.
>>
>>
>> It's just a standard regular expression.
>>
>> COMPATIBLE_MACHINE = "(machine1|machine2|machine3)"
>> COMPATIBLE_MACHINE .= "|machine4"
>>
>> Will result in a value of "(machine1|machine2|machine3)|machine4",
>> which is still a perfectly valid pattern, as far as I can tell.
>
>
> Yes, this does seem to work.  Any clues why most uses of COMPATIBLE_MACHINE
> use the regex "(x|y|z)" instead of just "x|y|z"?  Aren't they the same?

They are. No idea why people use the grouping.
-- 
Christopher Larson