[MacPorts] #57578: __has_feature(cxx_exceptions) returns true but fails to compile std::uncaught_exceptions()

[MacPorts]

#57578: __has_feature(cxx_exceptions) returns true but fails to compile
std::uncaught_exceptions()
-------------------------+-------------------------------------------------
  Reporter:  noloader    |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  C++17 cxx_exceptions
      Port:              |  std::uncaught_exceptions()
  clang++-mp-6.0         |
-------------------------+-------------------------------------------------

Comment (by mf2k):

 In the future, please fill in the Port field with the name of the port and
 add the port maintainer(s) to Cc ({{{port info --maintainers
 clang-6.0}}}), if any.

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Ticket URL: <https://trac.macports.org/ticket/57578#comment:4>
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