[MacPorts] #68490: Unable to upgrade libomp @17.0.3 -- Build Failed -- Needs Compiler with atomic support

[MacPorts]

#68490: Unable to upgrade libomp @17.0.3 -- Build Failed -- Needs Compiler with
atomic support
---------------------+--------------------
  Reporter:  RobK88  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.8.1
Resolution:          |   Keywords:
      Port:  libomp  |
---------------------+--------------------

Comment (by eborisch):

 In general that won't work, since it will create a dependency loop. Looks
 like I'll need to pin to the old version for lion/mtn. lion.

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Ticket URL: <https://trac.macports.org/ticket/68490#comment:3>
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