[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 Tommaso93):

 Replying to [comment:18 kencu]:
 > Replying to [comment:17 Tommaso93]:
 > > Using the new clang-11, will be possible to run ports that have the
 dependency on clang-9?
 >
 > That would be the idea...
 >
 > clang-9.0 seems to have been used in many places, so if we can patch it
 to build on BigSur, all the better for right now.
 >
 > Otherwise we'll have to change all the clang-9.0 references in various
 other ports to some newer clang, on the systems that can build the newer
 clang, etc. A larger project, and then we'd have to sort out the wreckage,
 if any.
 >
 > Try building the clang-devel that I updated yesterday, and please report
 back if that builds on BigSur.

 I tried building using clang-devel but it does not work as well. The log
 file is attached.

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Ticket URL: <https://trac.macports.org/ticket/61477#comment:22>
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