[MacPorts] #73923: tcl9 fails to build on Leopard

[MacPorts]

#73923: tcl9 fails to build on Leopard
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  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.12.5
Resolution:                |   Keywords:  leopard
      Port:  tcl9          |
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Comment (by Dave-Allured):

 You are using gcc-4.2, but `__builtin_unreachable` is only available in
 gcc-4.5 and newer.  What compiler alternatives are available on Leopard?

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Ticket URL: <https://trac.macports.org/ticket/73923#comment:5>
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