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  1. Qt Quality Assurance Infrastructure
  2. QTQAINFRA-4569

Add/modify a MSVC configuration for C++20

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      Hello,

      Latest MSVC has a "complete" C+20 support and a stable /std:c+20 switch:

      https://devblogs.microsoft.com/cppblog/msvc-cpp20-and-the-std-cpp20-switch/

      We should build Qt with that switch on and some aggressive enough warnings (/WX, at least for headersclean).

      (The interesting bit is that that switch turns /permissive- on automatically as conformance mode. See QTBUG-95880 for places where that switch bites us.)

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            hehalmet Heikki Halmet
            peppe Giuseppe D'Angelo
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