[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
 Keywords:  arm64       |       Port:  llvm-3.4
------------------------+----------------------
 llvm-3.4 doesn't build on arm64:

 https://build.macports.org/builders/ports-
 11_arm64-builder/builds/23259/steps/install-port/logs/stdio

 {{{
 checking build system type... Invalid configuration `arm64-apple-
 darwin20': machine `arm64-apple' not recognized
 }}}

 Maybe using a newer config.guess / config.sub helps?

 llvm-3.4 is a dependency of pure.

 pure could use llvm-3.5 if that still existed in MacPorts but it cannot
 use llvm 3.6 or newer because llvm 3.6 removed a fundamental llvm feature
 upon which pure was built:

 https://groups.google.com/g/pure-lang/c/nd__RPNI36I/m/NjZHjgyOAwAJ

-- 
Ticket URL: <https://trac.macports.org/ticket/63140>
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