[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):

 Well, I still don't agree but I already have llvmXX variants so I guess I
 don't care much either to use the first option.

 Now that I have your attention though: what are those
 libgcc_ext.10.*.dylib "stub" libraries? I'm having to jump through hoops
 to do a binary replace in those files because neither install_name_tool
 nor `reinplace` want to change their dylib ID (shhht, my current hack uses
 ex's binary mode ... 8-) ) \\
 Am I right that they're exclusively for OS X 10.4 and 10.5 respectively?
 In that case I might just as well enable `+with_libgcc` only on a more
 recent OS version and just ignore those libraries.

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Ticket URL: <https://trac.macports.org/ticket/54773#comment:11>
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