[MacPorts] #61477: clang-9.0 fails to build on Big Sur macOS 11.0.1 Xcode 12.2

[MacPorts]

#61477: clang-9.0 fails to build on Big Sur macOS 11.0.1 Xcode 12.2
------------------------+----------------------
  Reporter:  jhoyt4     |      Owner:  kencu
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  clang-9.0  |
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Comment (by cjones051073):

 clang-devel builds fine for me on BigSur.

 tommasco93 - Please make sure your ports tree is up to date. your log for
 clang-devel shows you are building an out of date version

  clang-devel-20200531

 thats a version from may this year... you should instead be building

 Oberon-macOS-11 ~/Projects/MacPorts/ports > port info clang-devel
 clang-devel @20201115-6ddc2377 (lang)

 see the date is from instead from November...

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Ticket URL: <https://trac.macports.org/ticket/61477#comment:23>
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