[MacPorts] #57911: libcxx @5.0.1_4: cc1plus: error: unrecognized command line option "-Wsign-conversion"

[MacPorts]

#57911: libcxx @5.0.1_4: cc1plus: error: unrecognized command line option "-Wsign-
conversion"
-------------------------+----------------------
  Reporter:  ryandesign  |      Owner:  jeremyhu
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  leopard
      Port:  libcxx      |
-------------------------+----------------------

Comment (by kencu):

 I should also say that we have to adjust our thinking on what +universal
 means on 10.4 and 10.5, because we don't have c++11 capable compilers that
 can cross build.

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Ticket URL: <https://trac.macports.org/ticket/57911#comment:3>
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