[MacPorts] #33256: Disable SMP compilation for Pypy translation (on 10.6)

[MacPorts]

#33256: Disable SMP compilation for Pypy translation (on 10.6)
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 Reporter:  macports.org@…             |       Owner:  macports-tickets@…                   
     Type:  defect                     |      Status:  new                                  
 Priority:  Normal                     |   Milestone:                                       
Component:  ports                      |     Version:  2.0.3                                
 Keywords:                             |        Port:  pypy                                 
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 Yesterday and today I tried updating my pypy 1.7 to 1.8, on a 2010 MBP
 with 8GB RAM.

 In both cases, the machine got swapped to death. The second time around I
 looked into what was happening, and I observed the driver Python process
 using ~2.5GB RAM (real memory) and 4 CC processes using 1~1.5GB RAM each.
 While using multiple jobs is good when the translation is CPU bound,
 forcing the machine to do everything on-disk because everything gets
 swapped out is not.

 I looked into it more, and apparently I'm hitting
 [https://bugs.launchpad.net/ubuntu/+source/gcc-4.2/+bug/187391 a wontfixed
 GCC 4.2 bug] which makes GCC eat insane amounts of memory when `-O1` or
 more is enabled. This may not be an issue in Lion depending on its GCC
 version.

 As a result, I think forcing `--make-jobs` to `1` (or removing SMP
 compilation altogether) in 10.6 would be a good idea.

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Ticket URL: <https://trac.macports.org/ticket/33256>
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