[MacPorts] #60470: clang-devel @20200505-6d6d48ad+analyzer+assertions+libstdcxx: fails to build

[MacPorts]

#60470: clang-devel @20200505-6d6d48ad+analyzer+assertions+libstdcxx: fails to
build
--------------------------+--------------------
  Reporter:  EdHarry      |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.6.2
Resolution:               |   Keywords:
      Port:  clang-devel  |
--------------------------+--------------------

Comment (by kencu):

 if you know how to build it with clang-9.0, please try that and report
 back.

 if you need a current toolchain, clang-10 is available on macports now and
 is the latest.

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Ticket URL: <https://trac.macports.org/ticket/60470#comment:2>
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