[MacPorts] #55444: clang-3.8 and later: All compilers are either blacklisted or unavailable

[MacPorts]

#55444: clang-3.8 and later: All compilers are either blacklisted or unavailable
-------------------------------------+-------------------------------------
  Reporter:  ryandesign              |      Owner:  jeremyhu
      Type:  defect                  |     Status:  new
  Priority:  Normal                  |  Milestone:
 Component:  ports                   |    Version:
Resolution:                          |   Keywords:  leopard snowleopard
      Port:  clang-3.8 clang-3.9     |  lion mountainlion
  clang-4.0 clang-5.0 clang-devel    |
-------------------------------------+-------------------------------------

Comment (by ryandesign):

 Replying to [comment:1 jeremyhu]:
 > I suppose we could make that check based on `[file exists
 /usr/lib/libc++.dylib] || ${configure.cxx_stdlib} eq "libc++"` since the
 port itself forces the use of libc++ even when it's not default (Lion /
 ML).

 That could be reasonable. If a port requires libc++, it will set
 `configure.cxx_stdlib libc++` and add the `port:libcxx` dependency, so
 that should work.

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Ticket URL: <https://trac.macports.org/ticket/55444#comment:2>
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