[MacPorts] #62158: py-protobuf3: install failures for macOS 10.8 through 10.11: compilation error related to PROTOBUF_MAYBE_CONSTEXPR MapFieldBase(ConstantInitialized)

[MacPorts]

#62158: py-protobuf3: install failures for macOS 10.8 through 10.11: compilation
error related to PROTOBUF_MAYBE_CONSTEXPR MapFieldBase(ConstantInitialized)
---------------------------+-------------------------
  Reporter:  mascguy       |      Owner:  Schamschula
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  py-protobuf3  |
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Comment (by mascguy):

 KenC and I - among other folks - are running a suite of macOS VMs, from
 10.6 through present. Parallels 16 runs them all beautifully, and only
 requires a one-time $50 purchase.

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Ticket URL: <https://trac.macports.org/ticket/62158#comment:8>
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