[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 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.

-- 
Ticket URL: <https://trac.macports.org/ticket/61477#comment:18>
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