[MacPorts] #58462: gcc9 @9.1.0, gcc10 @10-20190505: Portfile parse failures

[MacPorts]

#58462: gcc9 @9.1.0, gcc10 @10-20190505: Portfile parse failures
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  Reporter:  mndavidoff  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  gcc9 gcc10  |
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Comment (by cjones051073):

 Also, guess I should extend the gcc9/10 checks to catch when cctools still
 has the xcode variant ...

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Ticket URL: <https://trac.macports.org/ticket/58462#comment:5>
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