[MacPorts] #67738: py-grpcio: builds fail for 10.9 and earlier: error: invalid argument '-std=c++14' not allowed with 'C'

[MacPorts]

#67738: py-grpcio: builds fail for 10.9 and earlier: error: invalid argument
'-std=c++14' not allowed with 'C'
------------------------+----------------------
  Reporter:  mascguy    |      Owner:  mascguy
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.8.1
Resolution:             |   Keywords:
      Port:  py-grpcio  |
------------------------+----------------------

Comment (by ryandesign):

 Last I checked, Python doesn't support modules written in C++ so it can't
 pass flags to C and C++ compilers separately, so any module written in C++
 is doomed by design.

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Ticket URL: <https://trac.macports.org/ticket/67738#comment:1>
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