[MacPorts] #61870: primegen @0.97_0 fails to build on Apple Silicon

[MacPorts]

#61870: primegen @0.97_0 fails to build on Apple Silicon
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  Reporter:  vespasian99  |      Owner:  toy
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.6.4
Resolution:               |   Keywords:  bigsur arm64
      Port:  primegen     |
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Comment (by jmroot):

 Yes, it changed from a warning to an error in Xcode 12. The reason for
 that was potential arm64 ABI issues.

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Ticket URL: <https://trac.macports.org/ticket/61870#comment:3>
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