[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:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:  MacPorts Future
 Component:  ports     |    Version:  2.6.4
Resolution:            |   Keywords:  bigsur x86_64
      Port:  clang-11  |
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Changes (by haberg-1):

 * Attachment "hello_world.cc" added.

 Includes <iostream> and calls std::cout to trigger the issue.

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