[MacPorts] #69000: libcxx-powerpc: can we get rid of depending on system libstdc++ completely?

[MacPorts]

#69000: libcxx-powerpc: can we get rid of depending on system libstdc++ completely?
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  Reporter:  barracuda156    |      Owner:  catap
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.8.1
Resolution:                  |   Keywords:  leopard, snowleopard, powerpc
      Port:  libcxx-powerpc  |
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Comment (by barracuda156):

 Or maybe we need to add `emutls` into `libcxxabi` and possibly do not add
 `-D_GLIBCXX_USE_CXX11_ABI=0` flag.

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Ticket URL: <https://trac.macports.org/ticket/69000#comment:3>
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