[MacPorts] #53605: get GCC to use libc++?

[MacPorts]

#53605: get GCC to use libc++?
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  Reporter:  RJVB         |      Owner:
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  gcc6 gcc7    |
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Comment (by RJVB):

 (Annoying that I cannot change the ticket title)

 This is a new version of the port:gcc6 patch which adds a related fix that
 makes the GCC compiler family (including gfortran) more usable by allowing
 them to target more recent CPUs than those supported by the `as` command
 in port:cctools.

 This is done via a variant (default when using a +libcxx variant) that
 configures GCC to use the wrapper script from the proposed port:gccas.
 That turns the GCC compilers into a front-end for the LLVM assembler and
 linker.

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Ticket URL: <https://trac.macports.org/ticket/53605#comment:9>
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