[MacPorts] #55410: gcc7 @7.2.0 does not build on Mac OS X 10.6.8, Snow Leopard, because of "Undefined symbols for architecture x86_64"

[MacPorts]

#55410: gcc7 @7.2.0 does not build on Mac OS X 10.6.8, Snow Leopard, because of
"Undefined symbols for architecture x86_64"
------------------------+--------------------
  Reporter:  ballapete  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.2
Resolution:             |   Keywords:
      Port:  gcc7       |
------------------------+--------------------

Comment (by chrisjogorman):

 I will try what you suggest.  I am currently trying the suggestion with
 `libgcc6` as it appears to have failed at the linking stage due to the
 omission of `-stdlib=libc++` with `clang-3.9`.  How did you modify your
 version of clang to pass the switch if it is omitted?  (I would like to do
 as you do by passing the switch to `clang-3.9`).

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Ticket URL: <https://trac.macports.org/ticket/55410#comment:9>
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