[MacPorts] #54416: gcc8 draft port

[MacPorts]

#54416: gcc8 draft port
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  Reporter:  michaelld    |      Owner:
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  gcc8         |
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Comment (by ryandesign):

 We don't want a "libgcc8" port. The gcc8 port should have a libgcc-devel
 subport, as we've always done before. #54198 is the ticket that covers
 updating gcc7 and introducing libgcc6 and gcc8; this all must happen at
 the same time.

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Ticket URL: <https://trac.macports.org/ticket/54416#comment:2>
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