[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
 Keywords:  catalina     |       Port:  gcc8
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 It looks like gcc8 gets confused by a few macros, such as
 `__OSX_AVAILABLE_STARTING`. Attaching a log file.

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