[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 ballapete):

 Replying to [comment:65 kencu]:
 > > It seems I cannot build apple-gcc42 @5666.3_15-bootstrap…
 >
 > MacPorts recognizes `apple-gcc42 @5666.3_15` as being the equivalent to
 `apple-gcc42 -bootstrap` because `apple-gcc42 @5666.3_15` doesn't have the
 `+bootstrap` variant enabled.

 So from the start I was building with the proper compiler, `apple-gcc42
 @5666.3_15+gpl3`? Right now `apple-gcc42 @5666.3_15` is used for the
 build.

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Ticket URL: <https://trac.macports.org/ticket/56922#comment:66>
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