[MacPorts] #57621: py-gdal build failure on libstdc++ systems

[MacPorts]

#57621: py-gdal build failure on libstdc++ systems
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 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  py-gdal
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 py-gdal fails to build on libstdc++ systems because it requires C++11.

 Using the cxx11 1.1 portgroup is insufficient to fix the problem because
 this is a python port, and python's distutils does not support C++
 software. It compiles C++ software using the C compiler, hence the lovely
 flags the cxx11 portgroup adds don't get used.

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Ticket URL: <https://trac.macports.org/ticket/57621>
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