[MacPorts] #65987: libgcc9 fails to upgrade on BigSur 11.7

[MacPorts]

#65987: libgcc9 fails to upgrade on BigSur 11.7
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  Reporter:  bradman1972  |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.7.2
Resolution:               |   Keywords:
      Port:  libgcc9      |
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Comment (by cjones051073):

 Replying to [comment:3 jmroot]:
 > Requested vs unrequested variants are handled correctly in MP 2.7+,
 though of course a requested variant could still become unsupported in
 future. Seems like the compilers PG should not create variants for
 compilers that are not supported on the current platform?

 It doesn't. But the issue is users (who do not update that often) will
 have ports installed that do still depend on the old gcc versions, and it
 seems running an update tries to update the gcc dependency (and fails)
 before it updates the port itself, which would then I gather migrate to
 the newer dep.

-- 
Ticket URL: <https://trac.macports.org/ticket/65987#comment:4>
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