[MacPorts] #54773: port:libgcc/port:gcc7: proposed modifications, efficiency + libc++ support

[MacPorts]

#54773: port:libgcc/port:gcc7: proposed modifications, efficiency + libc++ support
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  Reporter:  RJVB         |      Owner:
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  gcc7 libgcc  |
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Comment (by jeremyhu):

 Replying to [comment:14 RJVB]:
 > but these figures justify a `+quick` variant IMHO.

 I suggest only rolling it out to gcc8 after you're done testing it.  That
 should be an appropriate audience to help find issues.

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Ticket URL: <https://trac.macports.org/ticket/54773#comment:16>
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