Qt6 OpenGL Static Release. Error: qopenglpaintengine.cpp:-1: error: undefined reference to `__imp_glMatrixMode'

Christian Ehrlicher

Ok - please take a look at this answer: https://stackoverflow.com/questions/9336263/glfw-undefined-references

Looks like MinGW split up the libs different to MSVC.

Also you can try to move -lopengl32 after all the other libs (for testing purposes directly on the command line)

8Observer8

I tried to delete this line win32: LIBS += -lopengl32:

QT       += core gui openglwidgets

INCLUDEPATH += "C:\Program Files\FMOD SoundSystem\FMOD Studio API Windows\api\core\inc"
LIBS += "C:\Program Files\FMOD SoundSystem\FMOD Studio API Windows\api\core\lib\x64\fmod.dll"

INCLUDEPATH += "E:\Libs\box2d-2.4.1-mingw-64-bit\include"
LIBS += -L"E:\Libs\box2d-2.4.1-mingw-64-bit\lib"
LIBS += -lbox2d

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    ColliderEdge.cpp \
    DebugDrawer.cpp \
    VertexBuffers.cpp \
    main.cpp \
    Widget.cpp

HEADERS += \
    ColliderEdge.h \
    DebugDrawer.h \
    VertexBuffers.h \
    Widget.h

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

RESOURCES += \
    Levels.qrc \
    Shaders.qrc \
    Sounds.qrc \
    Sprites.qrc

I tried to place it at the end:

QT       += core gui openglwidgets

INCLUDEPATH += "C:\Program Files\FMOD SoundSystem\FMOD Studio API Windows\api\core\inc"
LIBS += "C:\Program Files\FMOD SoundSystem\FMOD Studio API Windows\api\core\lib\x64\fmod.dll"

INCLUDEPATH += "E:\Libs\box2d-2.4.1-mingw-64-bit\include"
LIBS += -L"E:\Libs\box2d-2.4.1-mingw-64-bit\lib"
LIBS += -lbox2d

win32: LIBS += -lopengl32

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    ColliderEdge.cpp \
    DebugDrawer.cpp \
    VertexBuffers.cpp \
    main.cpp \
    Widget.cpp

HEADERS += \
    ColliderEdge.h \
    DebugDrawer.h \
    VertexBuffers.h \
    Widget.h

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

RESOURCES += \
    Levels.qrc \
    Shaders.qrc \
    Sounds.qrc \
    Sprites.qrc

I tried to place it at the beginning:

QT       += core gui openglwidgets

win32: LIBS += -lopengl32

INCLUDEPATH += "C:\Program Files\FMOD SoundSystem\FMOD Studio API Windows\api\core\inc"
LIBS += "C:\Program Files\FMOD SoundSystem\FMOD Studio API Windows\api\core\lib\x64\fmod.dll"

INCLUDEPATH += "E:\Libs\box2d-2.4.1-mingw-64-bit\include"
LIBS += -L"E:\Libs\box2d-2.4.1-mingw-64-bit\lib"
LIBS += -lbox2d

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    ColliderEdge.cpp \
    DebugDrawer.cpp \
    VertexBuffers.cpp \
    main.cpp \
    Widget.cpp

HEADERS += \
    ColliderEdge.h \
    DebugDrawer.h \
    VertexBuffers.h \
    Widget.h

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

RESOURCES += \
    Levels.qrc \
    Shaders.qrc \
    Sounds.qrc \
    Sprites.qrc

But the result is the same. It compiles without errors for dynamic version of Qt (both for Debug and Release) and it does not work for static release only.

Christian Ehrlicher

@8Observer8 said in Qt6 OpenGL Static Release. Error: qopenglpaintengine.cpp:-1: error: undefined reference to `__imp_glMatrixMode':

I tried to delete this line win32: LIBS += -lopengl32:

Why? Did you read my post, the so post and what I suggested?

8Observer8

@Christian-Ehrlicher said in Qt6 OpenGL Static Release. Error: qopenglpaintengine.cpp:-1: error: undefined reference to `__imp_glMatrixMode':

Why? Did you read my post, the so post and what I suggested?

I tried removing this line as an experiment to see if there would be more errors, but the number of errors remained the same. This is some kind of mystic. It's as if the linker is ignoring -lopengl32

8Observer8

@8Observer8 said in Qt6 OpenGL Static Release. Error: qopenglpaintengine.cpp:-1: error: undefined reference to `__imp_glMatrixMode':

Maybe should I include -opengl (or something like this) to config command before the static build?

configure -prefix "C:\Qt6.2.0_Static" -static -static-runtime -release -opensource -confirm-license -qt-zlib -qt-pcre -qt-libpng -qt-libjpeg -qt-freetype -opengl desktop -sql-odbc -sql-sqlite -nomake tools -nomake examples -nomake tests -skip qttools -skip qtquick3d -skip qt5compat -skip qtquicktimeline -skip qtwebengine -skip qtactiveqt -skip qtcharts -skip qtconnectivity -skip qtdatavis3d -skip qtimageformats -skip qtlottie -skip qtnetworkauth -skip qtremoteobjects -skip qtvirtualkeyboard -skip qtserialbus -skip qtserialport -skip qtwebchannel -skip qtwebview -skip qtwayland -skip qtscxml -skip qtmqtt -skip qtopcua -skip qtsvg -skip qtdoc -skip qttranslations

Here is -opengl

8Observer8

@Christian-Ehrlicher said in Qt6 OpenGL Static Release. Error: qopenglpaintengine.cpp:-1: error: undefined reference to `__imp_glMatrixMode':

Why? Did you read my post, the so post and what I suggested?

Yes, I did. For example, I tried this: In the linker, at Windows, MinGW: -lglew32 -lglfw3 -lopengl32 -lglu32 -lgdi32 But I do not use GLFW and GLEW. I tried these keys: lglu32 -lgdi32. I made a simple example in OpenGL. It compiles without errors for dynamic version of Qt 6.2.0 (both: for Debug and for Release builds) but it does not compile for static release only. Errors:

qopenglpaintengine.cpp:-1: error: undefined reference to `__imp_glMatrixMode'
qopenglpaintengine.cpp:-1: error: undefined reference to `__imp_glLoadIdentity'
qopenglpaintengine.cpp:-1: error: undefined reference to `__imp_glOrtho'
qopenglpaintengine.cpp:-1: error: undefined reference to `__imp_glLoadMatrixf'

pro

QT       += core gui openglwidgets
win32: LIBS += -lopengl32 -lglu32 -lgdi32

main.cpp


#include <QtWidgets/QApplication>
#include <QtOpenGLWidgets/QOpenGLWidget>
#include <QtGui/QOpenGLFunctions>

class Widget : public QOpenGLWidget, QOpenGLFunctions
{
private:
    void initializeGL() override
    {
        initializeOpenGLFunctions();
        glClearColor(0.3f, 0.3f, 0.3f, 1.f);
    }

    void paintGL() override
    {
        glClear(GL_COLOR_BUFFER_BIT);
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}

8Observer8

What else should I try?

8Observer8

I tried putting -lopengl32 at the end of the line: win32: LIBS += -lglu32 -lgdi32 -lopengl32

But:

8Observer8

I tried to create a question on StackOverflow: Failed to build OpenGL project with static Qt 6.2.0 but my question was closed as duplicate:

This question already has answers here:
What is an undefined reference/unresolved external symbol error and how do I fix it? (38 answers)

If anyone encounters this problem and solves it, then please write here how you solved this problem. I did everything I could.

fxr65

Probably you have to add the path to the libraries like this (in case the libs are in your project working dir):
LIBS += -L$$PWD -l<blah>
At least this helped me, as I had to add a lib to my project.

8Observer8

@fxr65 I think -lopengl32 references to "opengl32.dll". I tried to copy "opengl32.dll" from "C:\Windows\System32" to my working directory:

I added -L$$PWD to pro file:

QT += core gui openglwidgets

win32: LIBS += -L$$PWD -lopengl32

CONFIG += c++11

SOURCES += \
    main.cpp

But I see the same errors:

8Observer8

I have Windows 10 64 bit and Qt 6.2.0 MingGW 64 bit. I think in this case I should copy "opengl32.dll" from the "C:\Windows\SysWOW64" folder to my project directory. I tried it but I have the same errors as above.

fxr65

@8Observer8 I think you should get opengl32.lib for linker instead of dll. The dll for runtime depends on your app. In case your app is 32bit the dll is in syswow64 and for a 64bit app the dll is in system32. But you do not have to copy the dlls, as all system folders are in path.

8Observer8

@fxr65 said in Qt6 OpenGL Static Release. Error: qopenglpaintengine.cpp:-1: error: undefined reference to `__imp_glMatrixMode':

I think you should get opengl32.lib for linker instead of dll.

In my case it must be "libopengl.a" because I use MinGW instead of MSVC. But where to find "libopengl.a"? Why does my example work for dynamic Qt and it does not work for static Qt?

fxr65

@8Observer8 I use also mingw for compilation on a W10. Last week I also struggled to get a library recognized by the linker. After setting L and l it worked. libopengl.a is on linux systems, but as you are on W10 you need opengl32.lib. You can find the lib inside the windows sdk.
See https://stackoverflow.com/questions/22231740/opengl32-lib-not-linking-properly

8Observer8

@fxr65 said in Qt6 OpenGL Static Release. Error: qopenglpaintengine.cpp:-1: error: undefined reference to `__imp_glMatrixMode':

libopengl.a is on linux systems, but as you are on W10 you need opengl32.lib

I thought that MinGW uses the .a extension only. It compiles all libraries to '.a'. I tried to find libopengl32.a here C:\Qt6\6.2.0\mingw81_64\lib but I didn't find it.

@fxr65 I found OpenGL32.lib in this folder: C:\Program Files (x86)\Windows Kits\10\Lib\10.0.19041.0\um\x64:

I copied it to my project directory:

But it doesn't work:

QtStaticOpenGL.pro

QT += core gui openglwidgets

win32: LIBS += -L$$PWD -lopengl32

CONFIG += c++11

SOURCES += \
    main.cpp

main.cpp


#include <QtWidgets/QApplication>
#include <QtOpenGLWidgets/QOpenGLWidget>
#include <QtGui/QOpenGLFunctions>

class Widget : public QOpenGLWidget, QOpenGLFunctions
{
private:
    void initializeGL() override
    {
        initializeOpenGLFunctions();
        glClearColor(0.3f, 0.3f, 0.3f, 1.f);
    }

    void paintGL() override
    {
        glClear(GL_COLOR_BUFFER_BIT);
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}

fxr65

On my Qt 5.12 this compiles, links and runs:
opengl.pro

QT += core gui widgets

win32: LIBS += -L$$PWD -lopengl32

CONFIG += c++11

SOURCES += \
    main.cpp

main.cpp

#include <QtWidgets/QApplication.h>
#include <QtWidgets/QOpenGLWidget.h>
#include <QtGui/QOpenGLFunctions.h>

class Widget : public QOpenGLWidget, QOpenGLFunctions
{
private:
    void initializeGL() override
    {
        initializeOpenGLFunctions();
        glClearColor(0.3f, 0.3f, 0.3f, 1.f);
    }

    void paintGL() override
    {
        glClear(GL_COLOR_BUFFER_BIT);
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}

Also this compiles, links and runs:
opengl2.pro

QT += core gui widgets

win32:

CONFIG += c++11

SOURCES += \
    main.cpp \
    widget.cpp

HEADERS += \
  widget.h

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QtWidgets/QOpenGLWidget>
#include <QtGui/QOpenGLFunctions>

class Widget : public QOpenGLWidget, protected QOpenGLFunctions
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

private:
    void initializeGL() override;
    void paintGL() override;
    void resizeGL(int w, int h) override;
};
#endif // WIDGET_H

widget.cpp

#include "widget.h"

Widget::Widget(QWidget *parent)
    : QOpenGLWidget(parent)
{
    resize(500, 500);
    setWindowTitle("Qt6 C++, OpenGL ES 2.0");
}

Widget::~Widget()
{
}

void Widget::initializeGL()
{
    initializeOpenGLFunctions();
    glClearColor(0.2f, 0.2f, 0.2f, 1.0f);
}

void Widget::paintGL()
{
    glClear(GL_COLOR_BUFFER_BIT);
}

void Widget::resizeGL(int w, int h)
{
    glViewport(0, 0, w, h);
}

main.cpp

#include "Widget.h"

#include <QtWidgets/QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}

8Observer8

@fxr65 said in Qt6 OpenGL Static Release. Error: qopenglpaintengine.cpp:-1: error: undefined reference to `__imp_glMatrixMode':

On my Qt 5.12 this compiles, links and runs

Yes, Qt 5.15.2 Static works for me too. The problem is only with Qt 6.2.0

fxr65

@8Observer8 It seems I can't assist further as it compiles, links and runs on my 6.3.1. The second sample opengl2 did also compile and run after adding "win32: LIBS += -L$$PWD -lopengl32".

JonB

@8Observer8
Since @fxr65 says it all works under 6.3.1 the first thing would be for you check whether that does work for you too. That should clarify whether it is a Qt issue or an individual build issue.