[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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Comment (by jmroot):

 Replying to [comment:8 jmroot]:
 > I don't see any mention of `__has_feature` on the page you linked

 Which is because this macro is not itself part of any C++ standard. But
 the clang docs list `__has_feature(cxx_exceptions)` under C++98 and
 confirm that it only really tells you that you're not being compiled with
 -fno-exceptions.

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Ticket URL: <https://trac.macports.org/ticket/57578#comment:9>
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