[MacPorts] #55135: gcc5 @5.5.0 fails to build on Snow Leopard, Mac OS X 10.6.8, because linker command failed with undefined symbols for architecture x86_64

[MacPorts]

#55135: gcc5 @5.5.0 fails to build on Snow Leopard, Mac OS X 10.6.8, because linker
command failed with undefined symbols for architecture x86_64
------------------------+-------------------------
  Reporter:  ballapete  |      Owner:
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.2
Resolution:             |   Keywords:  snowleopard
      Port:  gcc5       |
------------------------+-------------------------

Comment (by ballapete):

 This morning I rebuilt and reinstalled `py27-cython` with default Clang
 3.9, but the build of GCC 5 fails again at the same spot with libbackend.
 I was wondering how `py27-cython` could have been built with an outdated
 GCC 5. Did I make a mistake and use GCC 6 instead again? The sequence of
 compile commands I used in GNU Emacs to build the ports shows that I used
 GCC 5 for the last build though…

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Ticket URL: <https://trac.macports.org/ticket/55135#comment:4>
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