[MacPorts] #62708: tmux crashes when building with macOS SDK 11.0 on macOS 10.15

[MacPorts]

#62708: tmux crashes when building with macOS SDK 11.0 on macOS 10.15
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  Reporter:  tgyurci  |      Owner:  tessus
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  tmux     |
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Comment (by kencu):

 here's a nice blurb about Apple's current approach to this.

 https://stackoverflow.com/questions/57825757/obj-c-has-available-swift-
 has-available-what-can-i-use-in-c-c

 Some open-source tool that scanned the code and pointed out the
 potentially troublesome functions would be useful!

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Ticket URL: <https://trac.macports.org/ticket/62708#comment:9>
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