Failure to find OpenGL and weird warnings in MSVC 2019

feistykittykat

Hello all,

I'm getting some weird errors when using MSVC 2019 to compile and run QT. Namely, the following:

Severity	Code	Description	Project	File	Line	Suppression State
Warning	C26451	Arithmetic overflow: Using operator '+' on a 4 byte value and then casting the result to a 8 byte value. Cast the value to the wider type before calling operator '+' to avoid overflow (io.2).	project_name c:\qt\5.12.2\msvc2017\include\qtcore\qglobal.h	591	
Warning	C26451	Arithmetic overflow: Using operator '-' on a 4 byte value and then casting the result to a 8 byte value. Cast the value to the wider type before calling operator '-' to avoid overflow (io.2).	project_name c:\qt\5.12.2\msvc2017\include\qtcore\qglobal.h	591	
Warning	C26451	Arithmetic overflow: Using operator '+' on a 4 byte value and then casting the result to a 8 byte value. Cast the value to the wider type before calling operator '+' to avoid overflow (io.2).	project_name	c:\qt\5.12.2\msvc2017\include\qtcore\qglobal.h	591	
Warning	C26451	Arithmetic overflow: Using operator '-' on a 4 byte value and then casting the result to a 8 byte value. Cast the value to the wider type before calling operator '-' to avoid overflow (io.2).	project_name	c:\qt\5.12.2\msvc2017\include\qtcore\qglobal.h	591	
Warning	C26498	The function 'qMetaTypeId<QtMetaTypePrivate::QPairVariantInterfaceImpl>' is constexpr, mark variable 'toId' constexpr if compile-time evaluation is desired (con.5).	project_name	c:\qt\5.12.2\msvc2017\include\qtcore\qmetatype.h	2287	
Warning	C26495	Variable 'QtSharedPointer::ExternalRefCountData::destroyer' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtcore\qsharedpointer_impl.h	154	
Warning	C26495	Variable 'QtSharedPointer::ExternalRefCountData::strongref' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtcore\qsharedpointer_impl.h	154	
Warning	C26495	Variable 'QtSharedPointer::ExternalRefCountData::weakref' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtcore\qsharedpointer_impl.h	154	
Warning	C26495	Variable 'QStringView::m_data' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtcore\qstringview.h	207	
Warning	C26495	Variable 'QStringView::m_size' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtcore\qstringview.h	207	
Warning	C26498	The function 'qMetaTypeId<QHash<QString,QVariant> >' is constexpr, mark variable 'vid' constexpr if compile-time evaluation is desired (con.5).	project_name	c:\qt\5.12.2\msvc2017\include\qtcore\qvariant.h	721	
Warning	C26498	The function 'qMetaTypeId<QList<QVariant> >' is constexpr, mark variable 'vid' constexpr if compile-time evaluation is desired (con.5).	project_name	c:\qt\5.12.2\msvc2017\include\qtcore\qvariant.h	721	
Warning	C26498	The function 'qMetaTypeId<QMap<QString,QVariant> >' is constexpr, mark variable 'vid' constexpr if compile-time evaluation is desired (con.5).	project_name	c:\qt\5.12.2\msvc2017\include\qtcore\qvariant.h	721	
Warning	C26498	The function 'qMetaTypeId<QPair<QVariant,QVariant> >' is constexpr, mark variable 'vid' constexpr if compile-time evaluation is desired (con.5).	project_name	c:\qt\5.12.2\msvc2017\include\qtcore\qvariant.h	721	
Warning	C26498	The function 'qMetaTypeId<QtMetaTypePrivate::QAssociativeIterableImpl>' is constexpr, mark variable 'vid' constexpr if compile-time evaluation is desired (con.5).	project_name	c:\qt\5.12.2\msvc2017\include\qtcore\qvariant.h	721	
Warning	C26498	The function 'qMetaTypeId<QtMetaTypePrivate::QPairVariantInterfaceImpl>' is constexpr, mark variable 'vid' constexpr if compile-time evaluation is desired (con.5).	project_name	c:\qt\5.12.2\msvc2017\include\qtcore\qvariant.h	721	
Warning	C26498	The function 'qMetaTypeId<QtMetaTypePrivate::QSequentialIterableImpl>' is constexpr, mark variable 'vid' constexpr if compile-time evaluation is desired (con.5).	project_name	c:\qt\5.12.2\msvc2017\include\qtcore\qvariant.h	721	
Warning	C26495	Variable 'QColor::cspec' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qcolor.h	283	
Warning	C26495	Variable 'QColor::ct' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qcolor.h	283	
Warning	C26495	Variable 'QColor::cspec' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qcolor.h	286	
Warning	C26495	Variable 'QColor::ct' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qcolor.h	286	
Warning	C26495	Variable 'QColor::cspec' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qcolor.h	289	
Warning	C26495	Variable 'QColor::ct' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qcolor.h	289	
Warning	C26495	Variable 'QColor::cspec' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qcolor.h	292	
Warning	C26495	Variable 'QColor::ct' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qcolor.h	292	
Warning	C26495	Variable 'QColor::cspec' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qcolor.h	296	
Warning	C26495	Variable 'QColor::ct' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qcolor.h	296	
Warning	C26439	This kind of function may not throw. Declare it 'noexcept' (f.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qfontmetrics.h	149	
Warning	C26495	Variable 'QMatrix::_dx' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qmatrix.h	60	
Warning	C26495	Variable 'QMatrix::_dy' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qmatrix.h	60	
Warning	C26495	Variable 'QMatrix::_m11' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qmatrix.h	60	
Warning	C26495	Variable 'QMatrix::_m12' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qmatrix.h	60	
Warning	C26495	Variable 'QMatrix::_m21' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qmatrix.h	60	
Warning	C26495	Variable 'QMatrix::_m22' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qmatrix.h	60	
Warning	C26495	Variable 'QMatrix::_dx' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qmatrix.h	70	
Warning	C26495	Variable 'QMatrix::_dy' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qmatrix.h	70	
Warning	C26495	Variable 'QMatrix::_m11' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qmatrix.h	70	
Warning	C26495	Variable 'QMatrix::_m12' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qmatrix.h	70	
Warning	C26495	Variable 'QMatrix::_m21' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qmatrix.h	70	
Warning	C26495	Variable 'QMatrix::_m22' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qmatrix.h	70	
Warning	C26495	Variable 'QPalette::<anonymous-tag>::for_faster_swapping_dont_use' is uninitialized. Always initialize a member variable (type.6).	project_name	c:\qt\5.12.2\msvc2017\include\qtgui\qpalette.h	71

So I wasn't too worried about these, but maybe I should be. I'm not even sure if they're related to my main problem, which is that visual studio isn't finding any versions of OpenGL. My only idea of a cause is that maybe the MSVC2017 build binaries aren't compatible with MSVC2019 like I initially hoped, but a google search tells me that I should be fine. When I try to create some #ifdefs, I always get the error that I'm throwing in the #else block of the following code:

QSurfaceFormat format;
#if   defined(QT_OPENGL_ES_3)
        format = settings->configOpenGLES(); // Configuring format for Open GL ES 3.0
    #elif defined(QT_OPENGL_ES_2)
        throw("Error, Open GL ES 2.0 is not supported by this hardware");
    #elif defined(QT_OPENGL)
        format = settings->configOpenGL();
    #else
        throw("Error, no rendering modes supported by this hardware");
    #endif

I'm not very familiar with Qt (and am developing on Windows), but I did notice that all versions of Open GL are disabled in my C:\Qt\5.12.2\msvc2017\include\QtGui\qtgui-config.h file. I'm not sure if this is related at all, since that file is just something that ships with Qt.

Lastly, my .pro looks like this:

message("Beginning qmake build of project_name.pro")

TEMPLATE = app
TARGET = project_name
QT += core \
      opengl \ 
	  gui \
	  widgets \
	  concurrent \ # Mutexes/multithreading
	  openglextensions \
	  network # TCP/IP

# Set general configuration options /////////////////////////////////////////////////
CONFIG += c++latest # Add support for c++17.
CONFIG += qt thread # console 
CONFIG += debug_and_release # Creates additional debug and release folders, but need it for debug

CONFIG(debug, debug|release){
    DESTDIR = ../app/debug
} else {
    DESTDIR = ../app/release
}

CONFIG += no_lflags_merge # Ensures that the list of libraries stored in the LIBS variable is not reduced to a list of unique values before it is used.
# CONFIG += CONSOLE # makes this a console application
CONFIG += flat # flattens file hierarchy, subtract if this is not desired

# Do not display debug output in release mode
CONFIG(debug, debug|release) : CONFIG += debug_info
CONFIG(release, debug|release) : DEFINES += QT_NO_DEBUG_OUTPUT

# Defines //////////////////////////////////////////////////////////////////////////
DEFINES += _UNICODE _ENABLE_EXTENDED_ALIGNED_STORAGE WIN64 QT_DLL QT_OPENGL_LIB QT_OPENGLEXTENSIONS_LIB QT_WIDGETS_LIB
INCLUDEPATH += ./qt_generated \
    . \
    ./qt_generated/$(ConfigurationName)
LIBS += -lopengl32 \
    -lglu32
DEPENDPATH += .


# Set directories //////////////////////////////////////////////////////////////////
MOC_DIR += ./qt_generated/moc
OBJECTS_DIR += ./qt_generated/obj
UI_DIR += ./qt_generated/ui
RCC_DIR += ./qt_generated

message("Loaded .pro files, now loading .pri")

# Load in library files for project
include(project_name.pri)

message("Loaded .pri files")

Which I am running with the following .bat file:

REM Build main app with visual studio make and qmake
call C:\"Program Files (x86)"\"Microsoft Visual Studio"\2019\Community\VC\Auxiliary\Build\vcvarsall.bat x86  && cd C:\Users\me\Documents\Projects\project-dir\project_name && call c:\Qt\5.12.2\msvc2017\bin\qmake -r -tp vc || echo qmake failed, Exit Code is %errorlevel% )

Any suggestions?

Edit: Just tried this with MSVC 2017. I'm no longer getting the warnings that I was getting before. However, my check for the QT_OPENGL macro variants is still not working. Any ideas? Is it possible that my system simply does not support open GL ES? If this is the case, how do I develop to support open GL ES?

feistykittykat

@feistykittykat Don't know if I'm allowed to bump this bad boy up. Been struggling to use PVRVFrame or something similar to get openGL found on my machine, but I have no idea how to set it up for QT. Still not even sure if that's the source of my problem.