[MacPorts] #63085: clang-12: compiler-rt build sometimes fails parallel building

[MacPorts]

#63085: clang-12: compiler-rt build sometimes fails parallel building
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  Reporter:  blair     |      Owner:  kencu
      Type:  defect    |     Status:  closed
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:  fixed     |   Keywords:
      Port:  clang-12  |
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Comment (by mouse07410):

 Ken, here's what I got on the llvm-dev mailing list:

 > I am not sure how that `add_custom_target` can help. Let's try run it
 during configuration time. Patch here: https://reviews.llvm.org/D106305

 I don't know enough of the llvm environment to figure whether this change
 will run on their systems, or it's a suggestion for us to test. But would
 you be able to give it a try, so I can report there whether it addresses
 the problem or not? Thanks!

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Ticket URL: <https://trac.macports.org/ticket/63085#comment:14>
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