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  1. Qt
  2. QTBUG-89679

std::popcount not found when compiling with msvc 2019 x64

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Not Evaluated
    • Resolution: Invalid
    • Affects Version/s: 6.0.0
    • Fix Version/s: None
    • Labels:
      None
    • Environment:
      Qt 6.0.0

      MSVC x64 19.28.29335
    • Platform/s:
      Windows

      Description

      Hi,

      When building with /std:c++latest on msvc 2019, compiler complain

      `error C2039: 'popcount': is not a member of 'std'` in qalgorithms.h file

       

      when adding #include <bit> on top of the header, the issue is fixed and the projet compile and run fine, so the problem is the detection of __cplusplus, it seems that msvc don't set the value of __cpluscplus (and set it to 199711) which cause the non inclusion of <bit> header

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            Assignee:
            thiago Thiago Macieira
            Reporter:
            arthapz arthur laurent
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              Dates

              Created:
              Updated:
              Resolved:

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