[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:  ken-cunningham-webuse
      Type:  defect        |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.5.4
Resolution:  fixed         |   Keywords:
      Port:  clang-8.0     |
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Comment (by jmroot):

 Replying to [comment:10 kencu]:
 > I'll have to install MP 2.6beta on 10.9 to see that chaining behaviour
 you notice, so I can start in to fix it.

 It's already fixed, by going straight to 3.7. That version is needed for
 cmake anyway and seemingly worked. It wouldn't be hard to go to 5.0
 instead, it would just be yet another step in the bootstrap chain.

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Ticket URL: <https://trac.macports.org/ticket/58952#comment:15>
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