[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, can you present this {{{add_custom_target()}}} in a patch form?
 (Especially since you probably keep the source tree?)

 If so, there's a decent chance it would be reviewed and (hopefully!)
 committed upstream.

 Thanks!

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Ticket URL: <https://trac.macports.org/ticket/63085#comment:13>
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