[MacPorts] #57751: qt4-mac: lots of errors trying to build with clang-7.0 (presumably related to defaulting to c++17 mode)

[MacPorts]

#57751: qt4-mac: lots of errors trying to build with clang-7.0 (presumably related
to defaulting to c++17 mode)
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  Reporter:  kencu    |      Owner:  michaelld
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  qt4-mac  |
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Comment (by Veence):

 {{{
 WTF::HashTable …
 }}}

 On the other hand, if you try compile a class named WTF…

 Any speculative schedule for the porting of Qt 5.12 just released? It’s
 the first version to officially support New 10.14 dark mode.

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Ticket URL: <https://trac.macports.org/ticket/57751#comment:5>
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