[MacPorts] #60032: MongoDB 4.2.3 fails to build on High Sierra

[MacPorts]

#60032: MongoDB 4.2.3 fails to build on High Sierra
------------------------+------------------------
  Reporter:  rseichter  |      Owner:  ryandesign
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.2
Resolution:             |   Keywords:
      Port:  mongodb    |
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Comment (by kencu):

 The linker error was very MacPorts-specific, and should have a permanent
 fix shortly.

 Whatever is causing XCode's clang to not see the {{{__builtin}}} function
 which it is supposed to support (as per the initial log submitted, and see
 [ticket:60032#comment:4] above) is not as clear at present. We are working
 around that manually by forcing a build with the open source clang-9.0
 from the llvm project.

-- 
Ticket URL: <https://trac.macports.org/ticket/60032#comment:22>
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