[MacPorts] #58741: get clang 3.4 and 3.9 4.0 5.0"back"

[MacPorts]

#58741: get clang 3.4 and 3.9 4.0 5.0"back"
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  Reporter:  rmottola             |      Owner:  (none)
      Type:  request              |     Status:  new
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:
Resolution:                       |   Keywords:
      Port:  clang-3.9 clang-4.0  |
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Comment (by jeremyhu):

 Also, I'm not aware of 5.0 being needed for bootstrapping later builds
 anywhere.  Where is that information coming from?  I'd like to also
 deprecate 5.0 and 6.0 next year.

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Ticket URL: <https://trac.macports.org/ticket/58741#comment:8>
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