[MacPorts] #51724: compilers-1.0: default to gcc6

[MacPorts]

#51724: compilers-1.0: default to gcc6
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  Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
      Type:  enhancement   |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:  fixed         |   Keywords:
      Port:                |
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Comment (by dstrubbe@…):

 Replying to [comment:6 mojca@…]:
 > I wonder if it would make sense to set this back to version 5 for
 10.5/PPC (#51388). It might not help much though if default version is
 hardcoded at so many other places.

 What is the proper way to write an if-condition that would check if we
 have 10.5/PPC?

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Ticket URL: <https://trac.macports.org/ticket/51724#comment:8>
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