[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 jeremyhu):

 Replying to [comment:13 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.

 Ok, then maybe it is for Xcode 6 and newer.  In any event, this
 functionality is pretty recent and definitely won't work with older tools.

 > > 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?

 That question is not relevant here.  You are confusing the version of the
 OS that you are running on versus the version of the OS that you are using
 the tools to build for.  These libraries are used when using a deployment
 target older than 10.6 (even when building on much newer OS versions).

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Ticket URL: <https://trac.macports.org/ticket/54773#comment:15>
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