[MacPorts] #59467: ghc @8.6.5_1: Built ghc not working on Catalina

[MacPorts]

#59467: ghc @8.6.5_1: Built ghc not working on Catalina
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  Reporter:  abusse  |      Owner:  essandess
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.2
Resolution:          |   Keywords:  catalina
      Port:  ghc     |
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Comment (by cjones051073):

 Also note, just to be clear, the information we have is it should be fixed
 in Xcode 11.2 (time will tell on this). At this point the blacklist can be
 made specific to the clang version range affected.

 Also, blacklisting Xcode 11 does not mean you have to install Xcode 10 !!
 It just means, for the port that does it, port will not use the Xcode
 clang versions blacklisted, and fallback to another compiler selection,
 which in this case will be MacPorts own build of clang 9.0. This works
 fine, we use it now in a number of places for exactly this issue.

-- 
Ticket URL: <https://trac.macports.org/ticket/59467#comment:8>
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