[MacPorts] #68118: highway: builds fail for 10.14: error: use of undeclared identifier '_knot_mask8'

[MacPorts]

#68118: highway: builds fail for 10.14: error: use of undeclared identifier
'_knot_mask8'
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  Reporter:  mascguy  |      Owner:  jmroot
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.8.1
Resolution:           |   Keywords:
      Port:  highway  |
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Comment (by mascguy):

 Replying to [comment:2 jmroot]:
 > highway: temporarily avoid using Xcode 10's clang

 Josh, are you interested in adding upstream's fix, to allow reverting the
 blacklist?

 [https://github.com/google/highway/pull/1713 PR 1713 - Fix AVX3 mask
 compilation issues]

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Ticket URL: <https://trac.macports.org/ticket/68118#comment:3>
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