[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:  MarcusCalhoun-Lopez
      Type:  defect               |     Status:  assigned
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:
Resolution:                       |   Keywords:
      Port:  clang-4.0 clang-5.0  |
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Comment (by mouse07410):

 Also, shouldn't the dependency (whether it's needed or not is another
 question) be on `libgcc` instead of `libgcc6`? Among other reasons, to
 allow pairing clang-5 with gcc7 instead of having to keep both gcc7 and
 gcc6 (thanks to explicitly specified libgcc6)?

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Ticket URL: <https://trac.macports.org/ticket/54766#comment:23>
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