[MacPorts] #57135: gcc8 powerpc-darwin9-apple: build fails at build/gencfn-macros

[MacPorts]

#57135: gcc8 powerpc-darwin9-apple: build fails at build/gencfn-macros
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  Reporter:  kencu   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  gcc8    |
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Comment (by kencu):

 It would appear that these internal math functions were added here
 <https://github.com/gcc-
 mirror/gcc/commit/1f24b8e93a813987ee9051c5ab554ea6d48a7b13#diff-
 4f175686003dda5a210d9507687045ab> and (not surprisingly) powerpc-
 darwin*-apple was not exactly a tested system at the time of
 implementation.

 I wonder if we can just somehow toggle them off?

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Ticket URL: <https://trac.macports.org/ticket/57135#comment:6>
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