[MacPorts] #63140: llvm-3.4: Invalid configuration `arm64-apple-darwin20': machine `arm64-apple' not recognized

[MacPorts]

#63140: llvm-3.4: Invalid configuration `arm64-apple-darwin20': machine
`arm64-apple' not recognized
-------------------------+----------------------
  Reporter:  ryandesign  |      Owner:  jeremyhu
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:              |   Keywords:  arm64
      Port:  llvm-3.4    |
-------------------------+----------------------

Comment (by ryandesign):

 Oh, I forgot that part. In that case, one could either fix llvm-3.4 for
 Apple Silicon or mark it as incompatible with Apple Silicon (using
 `supported_archs`).

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Ticket URL: <https://trac.macports.org/ticket/63140#comment:2>
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