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

[MacPorts]

#54773: port:libgcc/port:gcc7: proposed modifications, efficiency + libc++ support
--------------------------+----------------------
  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 RJVB):

 Replying to [comment:12 jeremyhu]:
 > > is there a hard reason why I shouldn't simply use /usr/bin/as -q
 >
 > Because that will only work well on Xcode 7 or 8 and newer.

 Care to give a bit more detail?
 My Xcode 6.something packs a clang 3.5 version and by the time you get
 around to replying I should have confirmation if gcc itself builds using
 that version for assembler or not.

 > Newer compiler runtime functionality was available on 10.4 and 10.5.
 Those dylibs cause that functionality to be packed up by "our"
 libgcc_s.1.dylib given that it is not present on the host OS.

 Which is the earliest OS version this port builds on as it is currently
 anyway?

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Ticket URL: <https://trac.macports.org/ticket/54773#comment:13>
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