[MacPorts] #56921: libgcc8 and libgcc-devel conflict

[MacPorts]

#56921: libgcc8 and libgcc-devel conflict
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  Reporter:  skymoo                       |      Owner:  (none)
      Type:  defect                       |     Status:  new
  Priority:  Normal                       |  Milestone:
 Component:  ports                        |    Version:
Resolution:                               |   Keywords:
      Port:  gcc8, libgcc8, libgcc-devel  |
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Comment (by cjones051073):

 libgcc8 now provides the default gcc runtime, via libgcc. Both thus
 intentionally conflict with libgcc-devel which is now based on gcc9.

 I suggest you (forcibly) uninstall your current gcc ports, then reinstall
 them back. If you want to be able to use gcc9 you will need to first
 install this, so that libgcc-devel is installed before libgcc is.

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Ticket URL: <https://trac.macports.org/ticket/56921#comment:2>
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