[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       |
------------------------+-------------------

Comment (by ballapete):

 Replying to [comment:5 ryandesign]:
 >
 > At least I assumed that was why it failed. But that would only make
 sense if it was trying to link with a dependency's library which used C++,
 and I can't see any of gcc's dependencies that use C++. So maybe it's
 failing for a different reason. Please try gcc7 @7.3.0 and if it still
 fails please attach a new log.
 >
 Sorry, I can't test anymore, I upgraded to El Capitan, OS X 10.11.6. (And
 might continue upgrading to High Sierra.)

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Ticket URL: <https://trac.macports.org/ticket/55410#comment:6>
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