[MacPorts] #54397: llvm-4.0 @4.0.0 fails to build on Snow Leopard because: "/opt/local/bin/clang-mp-3.9 -- broken!

[MacPorts]

#54397: llvm-4.0 @4.0.0 fails to build on Snow Leopard because: "/opt/local/bin
/clang-mp-3.9 -- broken!
------------------------+-------------------------
  Reporter:  ballapete  |      Owner:  jeremyhu
      Type:  defect     |     Status:  closed
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.1
Resolution:  duplicate  |   Keywords:  snowleopard
      Port:  llvm-4.0   |
------------------------+-------------------------

Comment (by ballapete):

 Replying to [comment:2 kencu]:
 > duplicate of [ticket:53931].
 >
 Sorry! I missed to continue after the recipe. Since I still do not know
 how to "uninstall all ports that use C++" I installed a fresh version of
 MacPorts and after I saw that libcxxabi and libcxx were installed I
 thought I could simply install all the missing other ports.

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Ticket URL: <https://trac.macports.org/ticket/54397#comment:4>
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