[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 ryandesign@…):

 Why can't I rely on the procs running in the defined order? They seem to
 run in that order. Why would we break that now?

 The purpose of the existence checks in the portgroup is to assist portfile
 developers in using the portgroup correctly, to sort of make the portgroup
 self-documenting.

 You may be right that we should just require the file to exist before
 post-destroot and use the real file instead of the symlink. I think the
 only reason I didn't do that in the first place is using the symlink
 looked prettier (shorter) in the portfile, but that hardly matters.

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Ticket URL: <https://trac.macports.org/ticket/36977#comment:3>
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