[MacPorts] #62770: clang++ 11 broken by MacOS 11.3 update

[MacPorts]

#62770: clang++ 11 broken by MacOS 11.3 update
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  Reporter:  haberg-1  |      Owner:  jeremyhu
      Type:  defect    |     Status:  closed
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.4
Resolution:  fixed     |   Keywords:  bigsur x86_64
      Port:  clang-11  |
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Comment (by cjones051073):

 clang-9 but cannot be reliably used, I've seen it generate bad code, give
 ICE etc. `mpich` should not generate these variants/subports on macOS11

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Ticket URL: <https://trac.macports.org/ticket/62770#comment:24>
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