[MacPorts] #58952: clang-8.0 fails to build in 10.9 buildbot.

[MacPorts]

#58952: clang-8.0 fails to build in 10.9 buildbot.
---------------------------+--------------------
  Reporter:  cjones051073  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.5.4
Resolution:                |   Keywords:
      Port:  clang-8.0     |
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Comment (by jmroot):

 Building 3.4 and 3.7 and 5.0 and 6.0 and 7.0 and 8.0 before you can build
 anything else isn't great UX. That's what happens when 8.0 is the default
 compiler and each one uses the most recent other one possible to build. So
 5.0 through 8.0 bootstrap with one version known to work, which was
 documented to be 3.7. (3.7 is needed to bootstrap cmake which is needed
 for the later clangs. 3.4 is needed to bootstrap libcxx and so is used to
 build 3.7.)

 Note that none of the above is relevant if /usr/bin/clang is deemed
 suitable to use.

 If 3.7 is not in fact able to build 8.0, please change it. But it seemed
 to work fine for me on 10.6.

-- 
Ticket URL: <https://trac.macports.org/ticket/58952#comment:9>
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