[MacPorts] #59224: gcc8 @8.3.0_4: confused by __OSX_AVAILABLE_STARTING

[MacPorts]

#59224: gcc8 @8.3.0_4: confused by __OSX_AVAILABLE_STARTING
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  Reporter:  MaddTheSane  |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.6.1
Resolution:               |   Keywords:  catalina
      Port:  gcc8         |
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Comment (by MaddTheSane):

 I should have mentioned this is on Catalina and Xcode 11.1.

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Ticket URL: <https://trac.macports.org/ticket/59224#comment:1>
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