[MacPorts] #58952: clang-8.0 fails to build in 10.9 buildbot.

[MacPorts]

#58952: clang-8.0 fails to build in 10.9 buildbot.
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  Reporter:  cjones051073  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.5.4
Resolution:                |   Keywords:
      Port:  clang-8.0     |
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Comment (by kencu):

 Can't do that without rearranging the base compiler defaults, I believe.
 It current bootstraps to 3.7 and then 8.0.

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Ticket URL: <https://trac.macports.org/ticket/58952#comment:12>
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