[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 mojca):

 Marcus, since you were patching this, do you have any idea where/how to
 fix the behaviour? I'm not too familiar with llvm sources. I did some
 grep-ing for various variables, I found places like `Opts.CPlusPlus11 =
 Std.isCPlusPlus11()`, but it's so much code that it's nearly impossible to
 know where the decision is made about whether or not C++11 should be the
 default.

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Ticket URL: <https://trac.macports.org/ticket/53634#comment:3>
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