[MacPorts] #62881: gcc11: port is deactivating libgcc10, resulting in broken dependent ports

[MacPorts]

#62881: gcc11: port is deactivating libgcc10, resulting in broken dependent ports
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  Reporter:  mascguy  |      Owner:  cjones051073
      Type:  defect   |     Status:  assigned
  Priority:  High     |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  gcc11    |
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Comment (by cjones051073):

 Replying to [comment:13 mascguy]:
 > Okay, so why does `libgcc11` conflict with `libgcc10` in the first
 place? `libgcc8`, `libgcc9`, and `libgcc10` all coexist peacefully while
 active.

 It only temporarily conflicts whilst the upgrade is happening. Before the
 update libgcc10 provides the primary runtime, whilst after the update
 libgcc11 does. The problem is the update process tries to install the new
 libgcc11 before the old libgcc10 is updated, leading to a temporary
 situation where they conflict.

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Ticket URL: <https://trac.macports.org/ticket/62881#comment:16>
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