[MacPorts] #66603: eigen3-devel: supported_archs noarch calls for Clang on Rosetta

[MacPorts]

#66603: eigen3-devel: supported_archs noarch calls for Clang on Rosetta
---------------------------+----------------------
  Reporter:  barracuda156  |      Owner:  kencu
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.0
Resolution:                |   Keywords:
      Port:  eigen3        |
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Comment (by jmroot):

 OK, so it's the fact that clang is used with build_arch=ppc that you're
 concerned about. The decision whether to put clang or gcc first in the
 fallback list is based on `${configure.build_arch}`, which is empty for
 noarch ports.

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Ticket URL: <https://trac.macports.org/ticket/66603#comment:3>
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