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  1. Qt
  2. QTBUG-72073

[REG 5.11->5.12] MSVC 64bit: Compile error C2666 when using std::bitset with QtCore

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      If using std::bitset with include <QtCore>, MSVC build will be failed as below.

      C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.10.25017\include\bitset(270): error C2666: 'operator /': 10 overloads have similar conversions
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qsize.h(364): note: could be 'const QSizeF operator /(const QSizeF &,qreal)'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qsize.h(194): note: or       'const QSize operator /(const QSize &,qreal)'
c:\qt\5.12.0\msvc2017_64\include\qtcore\qmargins.h(427): note: or       'QMarginsF operator /(const QMarginsF &,qreal)'
c:\qt\5.12.0\msvc2017_64\include\qtcore\qmargins.h(213): note: or       'QMargins operator /(const QMargins &,qreal)'
c:\qt\5.12.0\msvc2017_64\include\qtcore\qmargins.h(207): note: or       'QMargins operator /(const QMargins &,int)'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(205): note: or       'double operator /(int,qfloat16) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(205): note: or       'double operator /(qfloat16,int) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(195): note: or       'float operator /(float,qfloat16) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(195): note: or       'float operator /(qfloat16,float) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(194): note: or       'double operator /(double,qfloat16) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(194): note: or       'double operator /(qfloat16,double) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(193): note: or       'long double operator /(long double,qfloat16) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(193): note: or       'long double operator /(qfloat16,long double) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(176): note: or       'qfloat16 operator /(qfloat16,qfloat16) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qpoint.h(402): note: or       'const QPointF operator /(const QPointF &,qreal)'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qpoint.h(206): note: or       'const QPoint operator /(const QPoint &,qreal)'
C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.10.25017\include\bitset(270): note: or       'built-in C++ operator/(::size_t, )'
C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.10.25017\include\bitset(270): note: while trying to match the argument list '(::size_t, )'
C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.10.25017\include\bitset(266): note: while compiling class template member function 'std::bitset<8> &std::bitset<8>::set(::size_t,bool)'
C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.10.25017\include\bitset(39): note: see reference to function template instantiation 'std::bitset<8> &std::bitset<8>::set(::size_t,bool)' being compiled
..\Qt5.12.0-C2666\main.cpp(7): note: see reference to class template instantiation 'std::bitset<8>' being compiled
C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.10.25017\include\bitset(272): error C2666: 'operator /': 10 overloads have similar conversions
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qsize.h(364): note: could be 'const QSizeF operator /(const QSizeF &,qreal)'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qsize.h(194): note: or       'const QSize operator /(const QSize &,qreal)'
c:\qt\5.12.0\msvc2017_64\include\qtcore\qmargins.h(427): note: or       'QMarginsF operator /(const QMarginsF &,qreal)'
c:\qt\5.12.0\msvc2017_64\include\qtcore\qmargins.h(213): note: or       'QMargins operator /(const QMargins &,qreal)'
c:\qt\5.12.0\msvc2017_64\include\qtcore\qmargins.h(207): note: or       'QMargins operator /(const QMargins &,int)'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(205): note: or       'double operator /(int,qfloat16) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(205): note: or       'double operator /(qfloat16,int) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(195): note: or       'float operator /(float,qfloat16) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(195): note: or       'float operator /(qfloat16,float) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(194): note: or       'double operator /(double,qfloat16) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(194): note: or       'double operator /(qfloat16,double) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(193): note: or       'long double operator /(long double,qfloat16) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(193): note: or       'long double operator /(qfloat16,long double) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qfloat16.h(176): note: or       'qfloat16 operator /(qfloat16,qfloat16) noexcept'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qpoint.h(402): note: or       'const QPointF operator /(const QPointF &,qreal)'
C:\Qt\5.12.0\msvc2017_64\include\QtCore/qpoint.h(206): note: or       'const QPoint operator /(const QPoint &,qreal)'
C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.10.25017\include\bitset(272): note: or       'built-in C++ operator/(::size_t, )'
C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.10.25017\include\bitset(272): note: while trying to match the argument list '(::size_t, )'

       

      This failure is appeared from Qt 5.12. Qt 5.11 can build without error.

       

       

       

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-58555 MSVC 64bit: qtserialbus build failed

          • P0: Blocker - MUST be fixed ASAP. This includes issues that prevent/block further Qt development; Legal issues & Serious data loss issues.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-58555 MSVC 64bit: qtserialbus build failed

          • P0: Blocker - MUST be fixed ASAP. This includes issues that prevent/block further Qt development; Legal issues & Serious data loss issues.
          • Closed
          replaces

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-75201 visual studio 2017 can not build std::bitset with QtCore

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed
          For Gerrit Dashboard: QTBUG-72073
          # Subject Branch Project Status CR V
          246732,4 Move qbswap(qfloat16) to qfloat16.h 5.12 qt/qtbase Status: ABANDONED 0 0
          256188,9 Work around VS2015/17 bitset + qfloat16.h compiler bug 5.12 qt/qtbase Status: MERGED +2 0

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              thiago Thiago Macieira
              akizawa Akihito Izawa
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