Qt C++ lnk2019 errors with opengl widget

Cave1212

every time i added the opengl widget to my form i always gett lnk2019 unresolved external symbol errors and i did add QT += opengl to the pro file

JonB

@Cave1212
Try Googling, e.g. https://stackoverflow.com/questions/39175604/qt-opengl-link-error

LIBS += -lOpenGL32

Not my area, but is that what you need? You don't give us any clue as to which symbols are undefined....

Cave1212

@JonB i added that but i still get errors

bolt.obj:-1: error: LNK2019: unresolved external symbol "__declspec(dllimport) public: __cdecl QOpenGLWidget::QOpenGLWidget(class QWidget *,class QFlags<enum Qt::WindowType>)" (__imp_??0QOpenGLWidget@@QEAA@PEAVQWidget@@V?$QFlags@W4WindowType@Qt@@@@@Z) referenced in function "public: void __cdecl Ui_BOLT::setupUi(class QMainWindow *)" (?setupUi@Ui_BOLT@@QEAAXPEAVQMainWindow@@@Z)
debug\BOLT.exe:-1: error: LNK1120: 14 unresolved externals
bolt.obj:-1: error: LNK2019: unresolved external symbol "__declspec(dllimport) public: virtual __cdecl QOpenGLWidget::~QOpenGLWidget(void)" (__imp_??1QOpenGLWidget@@UEAA@XZ) referenced in function "public: virtual void * __cdecl QOpenGLWidget::`scalar deleting destructor'(unsigned int)" (??_GQOpenGLWidget@@UEAAPEAXI@Z)
bolt.obj:-1: error: LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __cdecl QOpenGLWidget::metaObject(void)const " (?metaObject@QOpenGLWidget@@UEBAPEBUQMetaObject@@XZ)
bolt.obj:-1: error: LNK2001: unresolved external symbol "public: virtual void * __cdecl QOpenGLWidget::qt_metacast(char const *)" (?qt_metacast@QOpenGLWidget@@UEAAPEAXPEBD@Z)
bolt.obj:-1: error: LNK2001: unresolved external symbol "public: virtual int __cdecl QOpenGLWidget::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@QOpenGLWidget@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z)
bolt.obj:-1: error: LNK2001: unresolved external symbol "protected: virtual void __cdecl QOpenGLWidget::initializeGL(void)" (?initializeGL@QOpenGLWidget@@MEAAXXZ)
bolt.obj:-1: error: LNK2001: unresolved external symbol "protected: virtual void __cdecl QOpenGLWidget::resizeGL(int,int)" (?resizeGL@QOpenGLWidget@@MEAAXHH@Z)
bolt.obj:-1: error: LNK2001: unresolved external symbol "protected: virtual void __cdecl QOpenGLWidget::paintGL(void)" (?paintGL@QOpenGLWidget@@MEAAXXZ)
bolt.obj:-1: error: LNK2001: unresolved external symbol "protected: virtual void __cdecl QOpenGLWidget::paintEvent(class QPaintEvent *)" (?paintEvent@QOpenGLWidget@@MEAAXPEAVQPaintEvent@@@Z)
bolt.obj:-1: error: LNK2001: unresolved external symbol "protected: virtual void __cdecl QOpenGLWidget::resizeEvent(class QResizeEvent *)" (?resizeEvent@QOpenGLWidget@@MEAAXPEAVQResizeEvent@@@Z)
bolt.obj:-1: error: LNK2001: unresolved external symbol "protected: virtual bool __cdecl QOpenGLWidget::event(class QEvent *)" (?event@QOpenGLWidget@@MEAA_NPEAVQEvent@@@Z)
bolt.obj:-1: error: LNK2001: unresolved external symbol "protected: virtual int __cdecl QOpenGLWidget::metric(enum QPaintDevice::PaintDeviceMetric)const " (?metric@QOpenGLWidget@@MEBAHW4PaintDeviceMetric@QPaintDevice@@@Z)
bolt.obj:-1: error: LNK2001: unresolved external symbol "protected: virtual class QPaintDevice * __cdecl QOpenGLWidget::redirected(class QPoint *)const " (?redirected@QOpenGLWidget@@MEBAPEAVQPaintDevice@@PEAVQPoint@@@Z)
bolt.obj:-1: error: LNK2001: unresolved external symbol "protected: virtual class QPaintEngine * __cdecl QOpenGLWidget::paintEngine(void)const " (?paintEngine@QOpenGLWidget@@MEBAPEAVQPaintEngine@@XZ)

JonB

@Cave1212
That looks like every single QOpenGLWidget class/method reference? Somebody may have a better suggestion than I, but I would look at the actual linker command line being issued from Creator/qmake to see what it does/does not have for OpenGL libraries.

Chris Kawa

Add QT += openglwidgets.
OpenGL support and widgets are in separate modules.

Btw. if you ever get linker errors about Qt classes you can go to their doc page and at the top it's listed which module they are in.

mateuszusd

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mateuszusd

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jsulm

@mateuszusd said in Qt C++ lnk2019 errors with opengl widget:

What should do to solve this problem in visual studio2022

What was already suggested