[MacPorts] #56922: Libgcc7 @7.3.0_1 fails to build on PPC Tiger, Mac OS X 10.4.11, because comparison of stages 2 and 3 fails

[MacPorts]

#56922: Libgcc7 @7.3.0_1 fails to build on PPC Tiger, Mac OS X 10.4.11, because
comparison of stages 2 and 3 fails
------------------------+--------------------
  Reporter:  ballapete  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.5.3
Resolution:             |   Keywords:  tiger
      Port:  libgcc7    |
------------------------+--------------------

Comment (by kencu):

 Everything finished building. `gcc6`, `libgcc6`, `gcc7`, `libgcc7`, and
 `libgcc` all built through to completion on my system without any
 modifications to any Portfiles.

 Figuring out exactly what is impairing your system from building them can
 be a challenge.

 I can make the binaries available if you like.

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Ticket URL: <https://trac.macports.org/ticket/56922#comment:58>
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