[MacPorts] #63110: clang-12 build error due to cmake portgroup setting an extremely old C and CXX standard because the llvm portfiles don't use base's compiler.c_standard or compiler.cxx_standard

[MacPorts]

#63110: clang-12 build error due to cmake portgroup setting an extremely old C and
CXX standard because the llvm portfiles don't use base's
compiler.c_standard or compiler.cxx_standard
----------------------+----------------------
  Reporter:  blair    |      Owner:  kencu
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  llvm-12  |
----------------------+----------------------

Comment (by kencu):

 and this one

 https://github.com/macports/macports-
 ports/commit/a3cbd09ac05a1ec6021ef757cc617506db6c1239

 where I suggested this was probably not a great plan

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Ticket URL: <https://trac.macports.org/ticket/63110#comment:5>
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