[MacPorts] #55592: libunwind @5.0.1: unrecognized command line option '-stdlib=libstdc++' with clang-3.4

[MacPorts]

#55592: libunwind @5.0.1: unrecognized command line option '-stdlib=libstdc++' with
clang-3.4
---------------------------+----------------------
  Reporter:  sideeffect42  |      Owner:  jeremyhu
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.4.2
Resolution:                |   Keywords:
      Port:  libunwind     |
---------------------------+----------------------

Comment (by ryandesign):

 Weird that the error message talks about g++ not understanding
 `-stdlib=libstdc++`, when the log clearly shows that g++ isn't being used;
 clang++-mp-3.4 is, and clang++-mp-3.4 does understand `-stdlib=libstdc++`.

 But sure, as we know, clang doesn't work on ppc, so we should adjust base
 to pick a better compiler on ppc.

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Ticket URL: <https://trac.macports.org/ticket/55592#comment:3>
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