[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 clang-10  |
---------------------------------+----------------------

Comment (by tiperiu):

 clang-devel also fails for me, but it fetches clang-devel-20200531
 I just reinstalled from scratch macports and also I did a selfupdate but
 still maps at that version and not 20201115

 Not sure what I need to do to get the newer one

-- 
Ticket URL: <https://trac.macports.org/ticket/61477#comment:27>
MacPorts <https://www.macports.org/>
Ports system for macOS