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

[MacPorts]

#73923: tcl9 fails to build on Leopard
---------------------------+---------------------
  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 ryandesign):

 Replying to [comment:6 Dave-Allured]:
 > It would be nice to not have to write a huge patch for all of those
 occurrences of `__builtin_unreachable`.

 Can a preprocessor define help here?

 {{{#!tcl
 configure.cppflags-append -D__builtin_unreachable= __builtin_trap
 }}}

 I have not tried this.

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Ticket URL: <https://trac.macports.org/ticket/73923#comment:8>
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