[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:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  clang-12  |
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Comment (by kencu):

 In a log like that, I search for "error 1".

 The real error is usually just above that point in the log, depending on
 how many parallel processes were running.

 Sometimes, the process that caused the error will be way before "error 1"
 shows up in the log, however -- it depends on how make has parallelized
 the jobs, and how long the others are until they are finished.

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Ticket URL: <https://trac.macports.org/ticket/63085#comment:5>
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