[MacPorts] #52131: cctools, ld64: Removing +llvm37 variant pulls in +llvm34 instead and toolchain becomes unstable on 10.6

[MacPorts]

#52131: cctools, ld64: Removing +llvm37 variant pulls in +llvm34 instead and
toolchain becomes unstable on 10.6
-------------------------------------+-------------------------
  Reporter:  kenneth.f.cunningham@…  |      Owner:  jeremyhu@…
      Type:  defect                  |     Status:  assigned
  Priority:  Normal                  |  Milestone:
 Component:  ports                   |    Version:  2.3.4
Resolution:                          |   Keywords:  snowleopard
      Port:  cctools ld64            |
-------------------------------------+-------------------------

Comment (by jeremyhu@…):

 > Then when cctools and ld64 upgraded, they called in clang-3.4/llvm3-4

 I understand why llvm-3.4 would be pulled in, but why was clang-3.4?  That
 doesn't make sense.

 > http://pastebin.com/bzuez8Xp

 Dang, that log's pretty useless =/ ... it looks like maybe an atexit
 handler is failing for some reason, maybe cxa_finalize gone wrong.

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Ticket URL: <https://trac.macports.org/ticket/52131#comment:8>
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