[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  |
------------------------+----------------------
Changes (by kencu):

 * owner:  (none) => kencu
 * status:  new => assigned
 * keywords:  clang-9.0 =>
 * cc: jeremyhu (added)


Comment:

 do you need clang 9.0 on BigSur?

 try clang-10 perhaps.

 clang-11 should be along soon to.

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Ticket URL: <https://trac.macports.org/ticket/61477#comment:1>
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