[MacPorts] #54548: clang++-mp-4.0 and clang++-mp-5.0 fail where /usr/bin/clang++ and g++-mp-6 succeed

[MacPorts]

#54548: clang++-mp-4.0 and clang++-mp-5.0 fail where /usr/bin/clang++ and g++-mp-6
succeed
----------------------------------+------------------------
  Reporter:  MarcusCalhoun-Lopez  |      Owner:  jeremyhu@…
      Type:  defect               |     Status:  new
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:
Resolution:                       |   Keywords:
      Port:  clang-4.0            |
----------------------------------+------------------------

Comment (by MarcusCalhoun-Lopez):

 There is now an upstream bug report
 [https://bugs.llvm.org/show_bug.cgi?id=33995 #33995].[[BR]]
 {{{/usr/bin/clang --version}}} gives
 {{{
 Apple LLVM version 8.1.0 (clang-802.0.42)
 Target: x86_64-apple-darwin16.7.0
 Thread model: posix
 InstalledDir:
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
 }}}

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Ticket URL: <https://trac.macports.org/ticket/54548#comment:2>
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