[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()
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  Reporter:  noloader   |      Owner:  jeremyhu
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  clang-6.0  |
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Changes (by mf2k):

 * status:  new => assigned
 * cc: larryv (added)
 * keywords:  C++17 cxx_exceptions std::uncaught_exceptions() =>
 * port:  clang++-mp-6.0 => clang-6.0
 * owner:  (none) => jeremyhu


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Ticket URL: <https://trac.macports.org/ticket/57578#comment:5>
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