[MacPorts] #53476: instruction on LibcxxOnOlderSystems fails on snowleopard

[MacPorts]

#53476: instruction on LibcxxOnOlderSystems fails on snowleopard
----------------------------+----------------------
  Reporter:  chrisjogorman  |      Owner:  jeremyhu
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  wiki           |    Version:  2.4.0
Resolution:                 |   Keywords:
      Port:  ld64           |
----------------------------+----------------------

Comment (by jeremyhu):

 Did you skip step 7, which was:

 7. Rebuild cctools and ld64 to use the newer version of llvm (currently
 llvm-3.9):
 {{{
 sudo port -v -n upgrade --force --enforce-variants cctools -llvm34 +llvm39
 sudo port -v -n upgrade --force --enforce-variants ld64 -llvm34 +llvm39
 }}}

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Ticket URL: <https://trac.macports.org/ticket/53476#comment:4>
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