Details
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Bug
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Resolution: Done
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P2: Important
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6.0.0
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None
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Windows, Visual Studio 2019
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Windows
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647c0e80ed2e190778016c4208b5d6f1f9fd6543 (qt/qtbase/dev)
Description
In qlagorithms.h, the function qPopulationCount, the reference to std::popcount fails to compile when using C++20.
: error C2039: 'popcount': is not a member of 'std' 1>C:\Qt\6.0.0\msvc2019_64\include\QtCore\qhashfunctions.h(303): message : see declaration of 'std'
In Windows, the following header is required to define std::popcount
#include <bit>
https://docs.microsoft.com/en-us/cpp/standard-library/bit-functions?view=msvc-160#popcount
Attachments
| For Gerrit Dashboard: QTBUG-91117 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 334375,1 | Fix compilation errors with MSVC /std:c++20, but no /Zc:__cplusplus | dev | qt/qtbase | Status: ABANDONED | +1 | 0 |
| 334623,3 | Enforce __cplusplus >= 201703L on MSVC | dev | qt/qtbase | Status: MERGED | +2 | 0 |
| 334649,1 | WIP: Check for _MSVC_LANG in public headers | dev | qt/qtbase | Status: ABANDONED | -2 | 0 |
| 335088,5 | headersclean: Compile with -std=c++latest, -Zc:__cplusplus on MSVC | dev | qt/qtbase | Status: MERGED | -1 | 0 |
| 335195,2 | Disallow C++ > 17 on MSVC unless /Zc:__cplusplus is passed | dev | qt/qtbase | Status: ABANDONED | +1 | 0 |
| 337440,2 | headersclean: Compile with -std=c++latest, -Zc:__cplusplus on MSVC | 6.1 | qt/qtbase | Status: MERGED | +2 | 0 |