[MacPorts] #54766: Does port:clang*'s libstdcxx have to be default?

[MacPorts]

#54766: Does port:clang*'s libstdcxx have to be default?
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  Reporter:  RJVB                 |      Owner:
      Type:  defect               |     Status:  new
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:
Resolution:                       |   Keywords:
      Port:  clang-4.0 clang-5.0  |
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Comment (by jmroot):

 I gather that this is in support of the cxx11 portgroup. It looks like the
 variant does not need to be default on platforms that default to libc++,
 at least.

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Ticket URL: <https://trac.macports.org/ticket/54766#comment:1>
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