[MacPorts] #53194: clang: have -stdlib=libstdc++ refer to MacPorts libstdc++

[MacPorts]

#53194: clang: have -stdlib=libstdc++ refer to MacPorts libstdc++
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  Reporter:  MarcusCalhoun-Lopez  |      Owner:  jeremyhu@…
      Type:  enhancement          |     Status:  new
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:
Resolution:                       |   Keywords:
      Port:  clang-3.9            |
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Comment (by kencu):

 or, as Jeremy suggested a few months back,
 <https://trac.macports.org/ticket/52468#comment:45>, use the moniker
 `macports-libstdc++` to refer to the one from libgcc, use `libstdc++` for
 the system's built-in one, and use `libc++` for the system's libc++ and
 for the one provided by the libcxx.

 And I see Jeremy is replying as well as I'm typing this :>  So yes, that
 would work, I think.

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Ticket URL: <https://trac.macports.org/ticket/53194#comment:2>
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