[MacPorts] #55382: cmake @3.10.0: Cannot find a C++ compiler supporting C++11 on this system

[MacPorts]

#55382: cmake @3.10.0: Cannot find a C++ compiler supporting C++11 on this system
-------------------------+-------------------------------------------------
  Reporter:  ryandesign  |      Owner:  michaelld
      Type:  defect      |     Status:  new
  Priority:  High        |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  tiger leopard snowleopard lion
      Port:  cmake       |  mountainlion
-------------------------+-------------------------------------------------

Comment (by kencu):

 Nope. Not a flag. Some kind of weird error in bootstrap:
 {{{
 ------------------------------------------
 clang: error: unknown argument: '-qlanglvl=extended0x'
 Test failed to compile
 Checking whether '/opt/local/bin/clang++-mp-3.7 -pipe -Os
 -stdlib=libstdc++ -arch x86_64 -qlanglvl=extended0x' works.
 Try: /opt/local/bin/clang++-mp-3.7
 Line: /opt/local/bin/clang++-mp-3.7 -pipe -Os -stdlib=libstdc++ -arch
 x86_64 -qlanglvl=extended0x cmake_bootstrap_4474_test.cxx -o
 cmake_bootstrap_4474_test
 }}}
 full log attached. Could be this plan won't work quite so easily - c++11
 features in clang-3.7 might only be active if the stdlib is set to libc++.
 The macports-libstdc++ stuff didn't show up until clang-3.9.

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Ticket URL: <https://trac.macports.org/ticket/55382#comment:4>
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