[MacPorts] #20859: rabbitmq-server 1.6.0 Add variant for building with Python 2.6

[MacPorts]

#20859: rabbitmq-server 1.6.0 Add variant for building with Python 2.6
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 Reporter:  mdippery@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement         |      Status:  new                                  
 Priority:  Normal              |   Milestone:                                       
Component:  ports               |     Version:  1.8.0                                
 Keywords:                      |        Port:  rabbitmq-server                      
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Comment(by jabronson@…):

 Replying to [comment:1 gaffneyc@…]:
 > I don't believe the version of python actually matters. I was able to
 build rabbitmq fine with the version of python that ships with Snow
 Leopard.
 that's because the version of python that ships with snow leopard is 2.6,
 which has the "json" library built in. for people still running leopard,
 the system python is version 2.5, which doesn't have it. so they either
 need macports python 2.6, or python2.5 with the simplejson library
 installed (see below).

 > I would prefer to remove the dependency on the Macports version of
 python since it is simply used to generate some initial code during the
 build phase and doesn't actually compile against anything.
 i downloaded the [http://www.rabbitmq.com/releases/rabbitmq-server/v1.6.0
 /rabbitmq-server-1.6.0.tar.gz source] and grepped for json, and this is
 the relevant part (from codegen.py):

 {{{
 try:
     try:
         import simplejson as json
     except ImportError, e:
         if sys.hexversion >= 0x20600f0:
             import json
         else:
             raise e
 except ImportError:
     print >> sys.stderr , " You don't appear to have simplejson.py
 installed"
     ...
     sys.exit(1)
 }}}

 so as long as the python used during make can import json (i.e. it's
 python 2.6) OR can import simplejson (any python version with simplejson
 installed), that part won't fail.

 does macports have the ability to choose the best python/json from among
 all those available (both system (based on OS X version) and macports), or
 does it not support fancy conditional dependencies? what is macports'
 imperative in situations like this? install the least amount of
 dependencies possible to allow for greater flexibility across different
 environments, or always install the same dependencies to keep things
 consistent across environments, even when superfluous? (it's impossible to
 optimize dependency resolution without knowing what you're optimizing for.
 fwiw, i vote flexibility > consistency.)

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Ticket URL: <http://trac.macports.org/ticket/20859#comment:4>
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