[MacPorts] #61747: Failed to build clang-7.0

[MacPorts]

#61747: Failed to build clang-7.0
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  Reporter:  rodmur     |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:             |   Keywords:
      Port:  clang-7.0  |
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Comment (by kencu):

 I wasn't really planning on trying to fix clang-7.0 for BigSur. Do you
 need it for something, or is it just an update from before?

 If you don't specifically need it, please uninstall it (and llvm-7.0) and
 use clang 9.0 ,10, or 11 -- those are all working on Big Sur.

 I suppose I should formally block these from installing on BigSur once we
 sort out exactly what fails where.

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Ticket URL: <https://trac.macports.org/ticket/61747#comment:1>
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