[MacPorts] #39065: atlas: build failure on 10.6.8

[MacPorts]

#39065: atlas: build failure on 10.6.8
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  Reporter:  atif.azad@…  |      Owner:  vince@…
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.1.3
Resolution:               |   Keywords:  snowleopard
      Port:  atlas        |
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Comment (by vince@…):

 Replying to [comment:11 atif.azad@…]:
 > Unfortunately I can't provide that output until Monday as the problem
 was on ,my office machine. But I appreciate you quickly looking into it.
 > Thanks very much

 You’re most welcome. I hope I’ll be able to find an easy workaround using
 the cpufamily ID. Otherwise, I’ll have no choice but disabling AVX build
 on 10.6, which means you would get an halved performance compared to what
 clang delivers.
 As an immediate workaround, you can rebuild atlas with the +clang33
 option, which should work fine.

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Ticket URL: <https://trac.macports.org/ticket/39065#comment:12>
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