[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 kencu):

 The llvm subproject itself is much more forgiving to build than the rest
 of the llvm projects, so I would not be surprised if it could be done.

 Sounds like, even if that were done, pure is not going to work on arm
 systems anyway, so it would be more of an experiment for fun than
 something that would get pure working on arm Macs:

 "
 One pain point is ARM based computers, though, which are getting much more
 popular these days. The old JIT never worked properly there, so Pure can't
 support the Raspberry Pi, ARM Chromebooks, and the new Mac M1 computers.
 To make Pure work there will definitely require an update to the MCJIT.
 ""

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Ticket URL: <https://trac.macports.org/ticket/63140#comment:1>
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