[MacPorts] #58869: ispc @1.11.0: fatal error: 'type_traits' file not found

[MacPorts]

#58869: ispc @1.11.0: fatal error: 'type_traits' file not found
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  Reporter:  ryandesign  |      Owner:  tenomoto
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  ispc        |
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Comment (by ryandesign):

 Replying to [comment:3 kencu]:
 > one thing to know is that macports-clang-7.0 and later default to c++17
 if none is specified. This can break builds on software that doesn't set a
 standard.

 Does the new compiler selection code slated to be released in MacPorts
 2.6.0 address this? Are we now setting a language standard by default? If
 not, those changes should at least make it easier to specify a language
 standard. I believe we'll now have a portfile option for that.

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Ticket URL: <https://trac.macports.org/ticket/58869#comment:5>
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