[MacPorts] #62688: Increase minimum C11 compatible compiler

[MacPorts]

#62688: Increase minimum C11 compatible compiler
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  Reporter:  ryandesign  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  base        |    Version:  2.6.99
Resolution:              |   Keywords:
      Port:              |
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Comment (by ryandesign):

 [wikipedia:C_standard_library#Header_files According to wikipedia]
 implementations are not required to support complex.h, stdatomic.h, and
 threads.h. So I don't know. Should we up the minimum C11 compiler to clang
 700, since that added stdatomic.h which several ports require, or should
 ports that require it be forced to blacklist clang < 700 manually?

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Ticket URL: <https://trac.macports.org/ticket/62688#comment:1>
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