[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 kencu):

 FYI, there are working versions of clang-3.8 and above that do accept
 `-stdlib=macports-libstdc++`.

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Ticket URL: <https://trac.macports.org/ticket/59584#comment:3>
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