[MacPorts] #58654: postgresql11-11.4_0 - problematic variant llvm

[MacPorts]

#58654: postgresql11-11.4_0 - problematic variant llvm
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  Reporter:  tk7r                       |      Owner:  jyrkiwahlstedt
      Type:  defect                     |     Status:  assigned
  Priority:  Normal                     |  Milestone:
 Component:  ports                      |    Version:  2.5.4
Resolution:                             |   Keywords:
      Port:  postgresql11 postgresql12  |
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Comment (by tk7r):

 I may have found the solution.
 on a working system 'port select --summary' shows:
 clang                   none                   mp-clang-8.0 none
 llvm                    none                   mp-llvm-6.0 mp-llvm-7.0 mp-
 llvm-8.0 none

 on a non-working system 'port select --summary' shows have a selected
 clang and llvm f.e. mp-llvm-8.0/mp-clang-8.0

 i have found the hint in the following post : https://postgrespro.com/list
 /thread-id/2384346

 is it possible to set the used compiler/linker from the whole compilation
 process? - it seems mixing clang/llvm versions during build results in
 these compile errors.

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Ticket URL: <https://trac.macports.org/ticket/58654#comment:4>
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