[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:
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.2
Resolution:             |   Keywords:
      Port:  gcc7       |
------------------------+-------------------
Changes (by ryandesign):

 * cc: jeremyhu, ryandesign (added)
 * keywords:  snowleopard =>


Comment:

 The compile line you showed that invokes `clang++-mp-3.9` clearly doesn't
 contain `-stdlib=libc++`, which is why it failed. But the `-stdlib` flag
 was deliberately removed from all gcc ports in
 [89d05e8e171da75f86ac27a575eedf1bef0e8818/macports-ports]. Jeremy, any
 advice on how this issue can be addressed?

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Ticket URL: <https://trac.macports.org/ticket/55410#comment:3>
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