[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 kencu):

 Replying to [comment:17 RJVB]:
 > Is it still possible to target 10.5 or 10.4 from, say, 10.9? I presume
 you'd need the corresponding SDKs, can you just copy them over?

 You might be interested in taking a look at the work this MacPorts
 contributor has done in this regard
 <https://github.com/devernay/xcodelegacy>

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Ticket URL: <https://trac.macports.org/ticket/54773#comment:19>
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