[MacPorts] #59158: libtorrent-rasterbar @1.2.2 fails to build on mavericks

[MacPorts]

#59158: libtorrent-rasterbar @1.2.2 fails to build on mavericks
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  Reporter:  tehcog                |      Owner:  dbevans
      Type:  defect                |     Status:  assigned
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:  2.6.1
Resolution:                        |   Keywords:
      Port:  libtorrent-rasterbar  |
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Comment (by ryandesign):

 In fact the port does use `compiler.cxx_standard 2011`. The attached log
 shows it using MacPorts clang++ 8 to build some earlier parts. But the
 build system then fails to use the requested compiler when "building
 'libtorrent' extension", going back to using /usr/bin/clang, which of
 course fails. The compiler selection needs to be propagated to all parts
 of the build

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Ticket URL: <https://trac.macports.org/ticket/59158#comment:3>
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