[MacPorts] #66886: clang-devel seems to be broken on macOS 12

[MacPorts]

#66886: clang-devel seems to be broken on macOS 12
--------------------------+----------------------
  Reporter:  catap        |      Owner:  jeremyhu
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  clang-devel  |
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Comment (by kencu):

 Yeah, don't do that :>

 when you go through {{{clang++-mp-devel}}} it calls clang through
 {{{xcrun}}} and that sets up the SDKROOT.  Otherwise, if you want to call
 {{{/opt/local/libexec/llvm-XXX/bin/clang++}}} then you must set up the
 SDKROOT yourself.

 try it with "-v" like I said and you should see what I mean.

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Ticket URL: <https://trac.macports.org/ticket/66886#comment:4>
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