[MacPorts] #61538: llvm-9.0 @9.0.1 seems to install faulty symbolic links

[MacPorts]

#61538: llvm-9.0 @9.0.1 seems to install faulty symbolic links
------------------------+--------------------
  Reporter:  ballapete  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:             |   Keywords:  bigsur
      Port:  clang-3.8  |
------------------------+--------------------

Comment (by cjones051073):

 Those sym links are not part of llvm 9.0.

 You must have run port select on clang at some port, and forgot to undo
 that before upgrading.

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Ticket URL: <https://trac.macports.org/ticket/61538#comment:1>
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