[MacPorts] #64639: How to build libcxx on 10.5.8?

[MacPorts]

#64639: How to build libcxx on 10.5.8?
---------------------------+------------------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:  powerpc, leopard
      Port:  libcxx        |
---------------------------+------------------------------

Comment (by evanmiller):

 {{{mrustc}}} does not require LLVM directly. It only uses LLVM in order to
 bootstrap a real Rust, i.e. compile {{{rustc}}}.

 I was able to build {{{mrustc}}} on Tiger/PPC without {{{libcxx}}}.
 However, the compiler hangs on any input due to the exception-handling bug
 described in https://github.com/iains/darwin-toolchains-start-
 here/discussions/17

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Ticket URL: <https://trac.macports.org/ticket/64639#comment:3>
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