[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):

 Just to add, my last fix allows libgcc or libgcc-devel to be updated to
 the new libgcc + libgcc8 ports.

 So if you previously had libgcc-devel (based on gcc8) installed you
 should, after this, have libgcc + libgcc8. If you then wish to have gcc9
 installed, you will need to manually remove libgcc and replace it with
 libgcc-devel (as before).

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Ticket URL: <https://trac.macports.org/ticket/56921#comment:6>
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