[MacPorts] #36977: app portgroup can fail when used with python portgroup

[MacPorts]

#36977: app portgroup can fail when used with python portgroup
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  Reporter:  gcasiraghi@…  |      Owner:  ryandesign@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.1.2
Resolution:                |   Keywords:
      Port:  app           |
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Comment (by jmr@…):

 You can't rely on pre/post procs running in a specific order, just as you
 can't rely on variants being executed in a specific order. However the
 source file doesn't need to exist to create a symlink, so you could
 probably just remove the existence checks. Alternatively, document that
 the app.* files must be created before post-destroot. In this case, the
 executable is itself a symlink, so you could solve the problem just by
 referencing the source file rather than the link.

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Ticket URL: <https://trac.macports.org/ticket/36977#comment:2>
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