[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):

 It's a compiler selection problem in base, in the location as per the link
 above into portconfigure.tcl, with about a five minute fix.

 If you want to try fixing the base problem (the clang selection needs to
 take into account whether you're building with libc++ or not -- currently
 supported macports-clangs < 5.0 don't support c++11 unless you're using
 libc++) then fork base, add the branch code right about where I indicated
 it goes, test it out until it works properly on all systems, and then PR
 it and hold your breath

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Ticket URL: <https://trac.macports.org/ticket/59584#comment:14>
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