[MacPorts] #58978: Unable to Upgrade xar or python27 - Fails to configure

[MacPorts]

#58978: Unable to Upgrade xar or python27 - Fails to configure
-------------------------+------------------------------
  Reporter:  RobK88      |      Owner:  (none)
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.4
Resolution:  worksforme  |   Keywords:  lion snowleopard
      Port:  xar         |
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Comment (by jmroot):

 Replying to [comment:10 kencu]:
 > Even with the new setup, once someone on 10.6.8 has clang-8.0 installed,
 my understanding is that MacPorts will then try to use that preferentially
 -- and if we have this same issue with a broken xar again, clang-8.0 will
 be broken -- unless I'm missing something.

 10.6 may indeed be worse. On 10.7 the system clang will be used though.

 This isn't a xar issue so much as an issue that will be encountered
 whenever any of the ports that the default compiler depends on break ABI.
 It would be safer not to use port-provided compilers to build any of the
 ports that those compilers depend on. Currently it's only avoided if the
 compiler ports are not already installed as a compromise, since using a
 newer compiler was considered to be better if possible.

-- 
Ticket URL: <https://trac.macports.org/ticket/58978#comment:13>
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