[MacPorts] #48145: castxml: add variants for different versions of clang toolchain, use corresponding toolchain for compilation

[MacPorts]

#48145: castxml: add variants for different versions of clang toolchain, use
corresponding toolchain for compilation
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  Reporter:  mmoll@…  |      Owner:  stromnov@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.3.3
Resolution:           |   Keywords:  haspatch
      Port:  castxml  |
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Comment (by ryandesign@…):

 Replying to [comment:2 mmoll@…]:
 > CastXML requires a C++11 compiler. It is probably a good idea to
 "inherit" the compiler blacklist from clang 3.6/3.7

 Then this port should use the cxx11-1.0 portgroup, and not set the
 blacklist manually.

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Ticket URL: <https://trac.macports.org/ticket/48145#comment:3>
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