[MacPorts] #58579: mysql8 @8.0.16: XCode 9.0 or newer is required!

[MacPorts]

#58579: mysql8 @8.0.16: XCode 9.0 or newer is required!
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  Reporter:  ryandesign  |      Owner:  herbygillot
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  mysql8      |
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Comment (by herbygillot):

 I don't have access to older versions of XCode/Clang, but here is an
 attempt:

 https://github.com/macports/macports-ports/pull/4568

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Ticket URL: <https://trac.macports.org/ticket/58579#comment:1>
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