[MacPorts] #58712: macports-clangs > 6.0 are missing atomic builtins on i386

[MacPorts]

#58712: macports-clangs > 6.0 are missing atomic builtins on i386
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  Reporter:  devernay                            |      Owner:  kencu
      Type:  defect                              |     Status:  assigned
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:
      Port:  clang-7.0 clang-8.0 clang-9.0       |
  clang-10 clang-devel                           |
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Comment (by kencu):

 as usual

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Ticket URL: <https://trac.macports.org/ticket/58712#comment:16>
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