[MacPorts] #63101: clang-12 @12.0.0: error: non-constant-expression cannot be narrowed from type 'long long' to 'std::size_t' (aka 'unsigned long') in initializer list [-Wc++11-narrowing]

[MacPorts]

#63101: clang-12 @12.0.0: error: non-constant-expression cannot be narrowed from
type 'long long' to 'std::size_t' (aka 'unsigned long') in initializer list
[-Wc++11-narrowing]
-------------------------+------------------------
  Reporter:  ryandesign  |      Owner:  kencu
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.99
Resolution:              |   Keywords:  highsierra
      Port:  clang-12    |
-------------------------+------------------------

Comment (by kencu):

 Will clang-12 build universal if you use clang-11 or clang-10 to build it,
 instead of the current default of clang-9.0?

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Ticket URL: <https://trac.macports.org/ticket/63101#comment:3>
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