[MacPorts] #59584: macports-clang versions <= 3.7 don't understand -stdlib=macports-libstdc++

[MacPorts]

#59584: macports-clang versions <= 3.7 don't understand -stdlib=macports-libstdc++
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  Reporter:  kencu   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:  2.6.2
Resolution:          |   Keywords:
      Port:          |
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Comment (by programmingkidx):

 Is there a way to install ICU on Mac OS 10.4? When I try to build it I see
 the error with "-stdlib=macports-libstdc++" using clang 3.4. When I try to
 install clang 3.9 it says to install clang 8.0. When I try to install
 clang 8.0 I see this error message: Error: libcxx is not supported on
 Tiger or earlier.

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Ticket URL: <https://trac.macports.org/ticket/59584#comment:6>
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