[MacPorts] #51711: libarchive @3.2.1 - Build failure

[MacPorts]

#51711: libarchive @3.2.1 - Build failure
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  Reporter:  eric@…      |      Owner:  toby@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:
      Port:  libarchive  |
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Comment (by toby@…):

 So it probably needs a more specific __clang__ version check. I'll try to
 figure out when __builtin_bswap16 was added.

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Ticket URL: <https://trac.macports.org/ticket/51711#comment:5>
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