[MacPorts] #53634: clang++-mp-4.0 -stdlib=macports-libstdc++ should be in C++11 mode by default

[MacPorts]

#53634: clang++-mp-4.0 -stdlib=macports-libstdc++ should be in C++11 mode by
default
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  Reporter:  mojca      |      Owner:  mojca
      Type:  defect     |     Status:  assigned
  Priority:  Low        |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  clang-4.0  |
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Comment (by kencu):

 See <https://reviews.llvm.org/D40948>. This commit changes the default
 language standard to c++14. It should be in the clang-6.0 release.

 I was way off -- there is a one-liner to change the language standard that
 I didn't find.

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Ticket URL: <https://trac.macports.org/ticket/53634#comment:10>
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