[MacPorts] #65598: clang-devel @20220731 fails to build with clang-11 as bootstrap compiler

[MacPorts]

#65598: clang-devel @20220731 fails to build with clang-11 as bootstrap compiler
--------------------------+--------------------------
  Reporter:  kencu        |      Owner:  cjones051073
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  clang-devel  |
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Comment (by kencu):

 clang-12 fails, so clang-13 is the floor.

 Which goes along with what llvm/clang/libcxx announced last year, that
 they would verify to build only with the last two compiler versions
 released.

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Ticket URL: <https://trac.macports.org/ticket/65598#comment:4>
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