[MacPorts] #58909: port at 2.5.99 does not build clang-8.0.0_1; port at 2.5.4 does build it and so does the buildbot

[MacPorts]

#58909: port at 2.5.99 does not build clang-8.0.0_1; port at 2.5.4 does build it and so
does the buildbot
------------------------+--------------------
  Reporter:  snowflake  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.5.99
Resolution:             |   Keywords:
      Port:  clang-8.0  |
------------------------+--------------------

Comment (by jmroot):

 The buildbot appears to have used the 10.12 SDK on 10.11 BTW, which means
 most likely xray would fail to run instead of failing to build.

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Ticket URL: <https://trac.macports.org/ticket/58909#comment:5>
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