[Qt-interest] Compiling OpenGL/SDL application on Windows, linker problems, undefined reference to qMain(int, char**)
Benjamin Sonnemann
b.sonnemann at gmail.com
Sat Mar 21 23:53:58 CET 2009
Well its because QApplication is in QtGui.lib
Remove the line
QApplication l_Application(argc, argv);
and you should be fine. As it looks you are doing nothing with the
application anyway
Benjamin Sonnemann
On Sat, Mar 21, 2009 at 5:18 AM, David Rappo <david.rappo at gmail.com> wrote:
> Hi,
>
> I tried adding QT -= gui to my profile.
>
> The result is:
>
> mingw32-make -f Makefile.Debug all
> mingw32-make[1]: Entering directory
> `C:/Users/David/Development/Tetris_SDL/Tetris'
> g++ -c -g -frtti -fno-exceptions -Wall -DUNICODE
> -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_OPENGL_LIB -DQT_CORE_LIB
> -DQT_THREAD_SUPPORT
> -I"c:\Qt\MinGW\qt-win-opensource-src-4.5.0\include\QtCore"
> -I"c:\Qt\MinGW\qt-win-opensource-src-4.5.0\include\QtOpenGL"
> -I"c:\Qt\MinGW\qt-win-opensource-src-4.5.0\include" -I"."
>
> -I"C:\libvectormath\simdvectormath\vectormathlibrary\include\vectormath\scalar\cpp"
> -I"C:\SDL\SDL_Win32_MinGW\SDL-1.2.13\include\SDL"
> -I"C:\Users\David\Development\Aurora\Aurora_Debug_Library"
> -I"C:\Users\David\Development\Aurora\Aurora_Math_Library"
> -I"C:\Users\David\Development\Aurora\Aurora_Render_Library"
> -I"c:\Qt\MinGW\qt-win-opensource-src-4.5.0\include\ActiveQt" -I"debug"
> -I"." -I"c:\Qt\MinGW\qt-win-opensource-src-4.5.0\mkspecs\win32-g++" -o
> debug\Main.o Main.cpp
> g++ -enable-stdcall-fixup -Wl,-enable-auto-import
> -Wl,-enable-runtime-pseudo-reloc -Wl,-subsystem,console -o
> debug\Tetris_Debug.exe debug/Main.o
> -L"c:\Qt\MinGW\qt-win-opensource-src-4.5.0\lib" -lopengl32 -lglu32
> -lgdi32 -luser32 -LC:\Users\David\Development\Aurora/Binary
> -lAurora_Render_Library_Debug
> -LC:\Users\David\Development\Aurora/Binary -lAurora_Math_Library_Debug
> -LC:\Users\David\Development\Aurora/Binary
> -lAurora_Debug_Library_Debug -LC:/MinGW/lib -lmingw32
> -LC:\SDL\SDL_Win32_MinGW\SDL-1.2.13\lib -lSDLmain
> -LC:\SDL\SDL_Win32_MinGW\SDL-1.2.13\lib -lSDL -lQtOpenGLd4 -lQtCored4
> debug/Main.o: In function `SDL_main':
> C:/Users/David/Development/Tetris_SDL/Tetris/Main.cpp:35: undefined
> reference to `_imp___ZN12QApplicationC1ERiPPci'
> C:/Users/David/Development/Tetris_SDL/Tetris/Main.cpp:41: undefined
> reference to `QApplication::~QApplication()'
> C:/Users/David/Development/Tetris_SDL/Tetris/Main.cpp:48: undefined
> reference to `QApplication::~QApplication()'
> C:/Users/David/Development/Tetris_SDL/Tetris/Main.cpp:63: undefined
> reference to `QApplication::~QApplication()'
> collect2: ld returned 1 exit status
> mingw32-make[1]: *** [debug\Tetris_Debug.exe] Error 1
> mingw32-make[1]: Leaving directory
> `C:/Users/David/Development/Tetris_SDL/Tetris'
> mingw32-make: *** [debug-all] Error 2
>
> Thanks,
>
> David
>
> 2009/3/20 Benjamin Sonnemann <b.sonnemann at gmail.com>:
> > Try this in pro file:
> >
> > QT -= gui
> >
> > But i dont know whether its wise what you do there. The problem with
> > -lSDLmain is, it redefines your main(int, char**)
> > to sth like SDL_main(int, char**) and places its own code in the _real_
> main
> > to do its bootstrapping. Now Qt seems to
> > do sth similar ( need someone with more deeper Qt knowledge here, as i am
> > relative fresh into Qt). Hopefully its only
> > needed for gui classes, because then it should be fine.
> >
> > Benjamin Sonnemann
> >
> >
> > On Fri, Mar 20, 2009 at 11:02 AM, David Rappo <david.rappo at gmail.com>
> wrote:
> >>
> >> Hi,
> >>
> >> I am trying to build an OpenGL/SDL application on Windows. I'm using
> >> qmake to generate my make files. The application runs fine on Linux,
> >> but I ran into linker problems when I tried to build on Windows. I've
> >> pasted my pro file below (I'm writing a Tetris clone).
> >>
> >> // Linker errors
> >>
> >>
> //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
> >>
> >> In file included from
> >> C:/SDL/SDL_Win32_MinGW/SDL-1.2.13/include/SDL/SDL.h:28,
> >> from Main.cpp:5:
> >> C:/SDL/SDL_Win32_MinGW/SDL-1.2.13/include/SDL/SDL_main.h:50:1:
> >> warning: "main" redefined
> >> In file included from
> >> c:/Qt/MinGW/qt-win-opensource-src-4.5.0/include/QtGui/qwindowdefs.h:1,
> >> from
> >>
> >>
> c:/Qt/MinGW/qt-win-opensource-src-4.5.0/include/QtGui/../../src/gui/kernel/qevent.h:45,
> >> from
> >> c:/Qt/MinGW/qt-win-opensource-src-4.5.0/include/QtGui/qevent.h:1,
> >> from
> >>
> >>
> c:/Qt/MinGW/qt-win-opensource-src-4.5.0/include/QtGui/../../src/gui/accessible/qaccessible.h:52,
> >> from
> >> c:/Qt/MinGW/qt-win-opensource-src-4.5.0/include/QtGui/qaccessible.h:1,
> >> from
> >> c:/Qt/MinGW/qt-win-opensource-src-4.5.0/include/QtGui/QtGui:4,
> >> from
> >> c:/Qt/MinGW/qt-win-opensource-src-4.5.0/include/QtOpenGL/QtOpenGL:4,
> >> from Main.cpp:3:
> >>
> >>
> c:/Qt/MinGW/qt-win-opensource-src-4.5.0/include/QtGui/../../src/gui/kernel/qwindowdefs.h:147:1:
> >> warning: this is the location of the previous definition
> >> g++ -enable-stdcall-fixup -Wl,-enable-auto-import
> >> -Wl,-enable-runtime-pseudo-reloc -Wl,-s -Wl,-subsystem,windows -o
> >> release\Tetris.exe release/Main.o
> >> -L"c:\Qt\MinGW\qt-win-opensource-src-4.5.0\lib" -lopengl32 -lglu32
> >> -lgdi32 -luser32 -lmingw32 -lqtmain
> >> -LC:\Users\David\Development\Aurora/Binary -lAurora_Render_Library
> >> -LC:\Users\David\Development\Aurora/Binary -lAurora_Math_Library
> >> -LC:\Users\David\Development\Aurora/Binary -lAurora_Debug_Library
> >> -LC:/MinGW/lib -lmingw32 -LC:\SDL\SDL_Win32_MinGW\SDL-1.2.13\lib
> >> -lSDLmain -LC:\SDL\SDL_Win32_MinGW\SDL-1.2.13\lib -lSDL -lQtOpenGL4
> >> -lQtGui4 -lQtCore4
> >>
> >>
> c:\Qt\MinGW\qt-win-opensource-src-4.5.0\lib/libqtmain.a(qtmain_win.o):qtmain_win.cpp:(.text+0x130):
> >> undefined reference to `qMain(int, char**)'
> >> // End linker errors
> >>
> >>
> //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
> >>
> >> If the following lines are commented out:
> >>
> >> LIBS += -LC:/MinGW/lib -lmingw32
> >> LIBS += -L$(SDL_LIBRARY_PATH) -lSDLmain
> >>
> >> I get:
> >>
> >> // Linker errors
> >>
> >>
> //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
> >> /mingw/lib/libmingw32.a(main.o):main.c:(.text+0xbd): undefined
> >> reference to `WinMain at 16'
> >> // End linker errors
> >>
> >>
> //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
> >>
> >> Has anybody done this? I don't need to use QWidgets. I only need to
> >> use some of the classes in QtCore such as QString and QFile.
> >>
> >> I've spent some time searching the Internet, and I've found lots of
> >> posts about undefined references to `WinMain at 16', but nothing that
> >> applies to my situation.
> >>
> >> Is there any way to do what I want to do without having to install
> >> Cygwin or mysys?
> >>
> >> Many thanks,
> >>
> >> David
> >>
> >> ######################################################################
> >> # Tetris.pro
> >> ######################################################################
> >>
> >> TEMPLATE = app
> >>
> >> DEPENDPATH += .
> >>
> >> INCLUDEPATH += .
> >> INCLUDEPATH += $(LIBVECTORMATH_PATH)/scalar/cpp
> >> INCLUDEPATH += $(SDL_INCLUDE_PATH)
> >>
> >> CONFIG += debug_and_release
> >> CONFIG += build_all
> >>
> >> CONFIG(debug, debug|release) {
> >> win32: CONFIG += console
> >>
> >> TARGET = Tetris_Debug
> >> } else {
> >> DEFINES += QT_NO_DEBUG_OUTPUT
> >> DEFINES += QT_NO_WARNING_OUTPUT
> >> DEFINES += QT_NO_DEBUG
> >>
> >> TARGET = Tetris
> >> }
> >>
> >> # Not necessary on Linux
> >> LIBS += -LC:/MinGW/lib -lmingw32
> >> # Not necessary on Linux
> >> LIBS += -L$(SDL_LIBRARY_PATH) -lSDLmain
> >> # Same on Linux and Windows
> >> LIBS += -L$(SDL_LIBRARY_PATH) -lSDL
> >>
> >> QT += opengl
> >>
> >> ######################################################################
> >> # Headers
> >> ######################################################################
> >>
> >> #HEADERS += file.h
> >>
> >> ######################################################################
> >> # Sources
> >> ######################################################################
> >>
> >> SOURCES += Main.cpp
> >>
> >> // Main.cpp
> >>
> >> #include <QtCore>
> >> //#include <QtGui>
> >> #include <QtOpenGL>
> >> #include "vectormath_aos.h"
> >> #include "SDL.h"
> >>
> >>
> >> //
> >>
> --------------------------------------------------------------------------------
> >> // Global variables
> >> //
> >>
> --------------------------------------------------------------------------------
> >>
> >> const SDL_VideoInfo* g_SDL_VideoInfo = 0;
> >> SDL_Surface* g_SDL_Surface = 0;
> >> QSize g_Client_Area_Size(800, 600);
> >> bool g_Quit = false;
> >>
> >> //
> >>
> --------------------------------------------------------------------------------
> >> // Global functions
> >> //
> >>
> --------------------------------------------------------------------------------
> >>
> >> void Process_Events(void);
> >> void Display_Scene(void);
> >> void Setup_Render_States(void);
> >> void Reshape(int in_Width, int in_Height);
> >> bool Setup_Video(void);
> >>
> >> //
> >>
> --------------------------------------------------------------------------------
> >> // main
> >> //
> >>
> --------------------------------------------------------------------------------
> >>
> >> int main(int argc, char *argv[])
> >> {
> >> AURORA_DEBUG_METHOD_SCOPE;
> >>
> >> QApplication l_Application(argc, argv);
> >>
> >> if ( SDL_Init(SDL_INIT_VIDEO) == -1 )
> >> {
> >> //QMessageBox::warning(0, "SDL", "SDL_Init returned -1");
> >> SDL_Quit();
> >> return 1;
> >> }
> >>
> >> if (!Setup_Video())
> >> {
> >> //QMessageBox::warning(0, "SDL", "Setup_Video returned
> >> false");
> >> SDL_Quit();
> >> return 1;
> >> }
> >>
> >> Setup_Render_States();
> >>
> >> qDebug() << "Entering main game loop\n";
> >>
> >> while (g_Quit == false)
> >> {
> >> Process_Events();
> >> Display_Scene();
> >> }
> >>
> >> SDL_Quit();
> >>
> >> return 0;
> >> }
> >>
> >> void Process_Events(void)
> >> {
> >> SDL_Event l_SDL_Event;
> >>
> >> while ( SDL_PollEvent(& l_SDL_Event) )
> >> {
> >> switch (l_SDL_Event.type)
> >> {
> >> case SDL_VIDEORESIZE:
> >> {
> >> qDebug() << "SDL_VIDEORESIZE" << "\n";
> >> qDebug() << "l_SDL_Event.resize.w == " <<
> >> l_SDL_Event.resize.w << "\n";
> >> qDebug() << "l_SDL_Event.resize.h == " <<
> >> l_SDL_Event.resize.h << "\n";
> >>
> >> Reshape( l_SDL_Event.resize.w,
> >> l_SDL_Event.resize.h );
> >> }
> >> break;
> >> case SDL_KEYDOWN:
> >> {
> >> if (l_SDL_Event.key.keysym.sym ==
> >> SDLK_SPACE)
> >> {
> >> qDebug() << "Space key
> pressed!\n";
> >> }
> >>
> >> if (l_SDL_Event.key.keysym.sym ==
> >> SDLK_ESCAPE)
> >> {
> >> qDebug() << "Escape key
> >> pressed!\n";
> >> g_Quit = true;
> >> }
> >> }
> >> break;
> >> case SDL_KEYUP:
> >> {
> >> if (l_SDL_Event.key.keysym.sym ==
> >> SDLK_SPACE)
> >> {
> >> qDebug() << "Space key
> >> released!\n";
> >> }
> >>
> >> if (l_SDL_Event.key.keysym.sym ==
> >> SDLK_ESCAPE)
> >> {
> >> qDebug() << "Escape key
> >> released!\n";
> >> }
> >> }
> >> break;
> >>
> >> case SDL_MOUSEBUTTONDOWN:
> >> {
> >> Uint8 l_Mouse_Button =
> >> l_SDL_Event.button.button;
> >> QString l_Mouse_Button_String = (
> >> (l_Mouse_Button ==
> >> SDL_BUTTON_LEFT) ? "SDL_BUTTON_LEFT" : "SDL_BUTTON_RIGHT" );
> >> qDebug() << "SDL_MOUSEBUTTONDOWN: " <<
> >> l_Mouse_Button_String << "\n";
> >> }
> >> break;
> >>
> >> case SDL_MOUSEBUTTONUP:
> >> {
> >> Uint8 l_Mouse_Button =
> >> l_SDL_Event.button.button;
> >> QString l_Mouse_Button_String = (
> >> (l_Mouse_Button ==
> >> SDL_BUTTON_LEFT) ? "SDL_BUTTON_LEFT" : "SDL_BUTTON_RIGHT" );
> >> qDebug() << "SDL_MOUSEBUTTONUP: " <<
> >> l_Mouse_Button_String << "\n";
> >> }
> >> break;
> >>
> >> case SDL_QUIT:
> >> {
> >> qDebug() << "SDL_QUIT" << "\n";
> >> g_Quit = true;
> >> }
> >> break;
> >> }
> >> }
> >> }
> >>
> >> void Display_Scene(void)
> >> {
> >> glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
> >>
> >> glLoadIdentity();
> >>
> >> SDL_GL_SwapBuffers();
> >> }
> >>
> >> void Setup_Render_States(void)
> >> {
> >> GLfloat l_Red = 1.0;
> >> GLfloat l_Green = 1.0;
> >> GLfloat l_Blue = 1.0;
> >> GLfloat l_Alpha = 0.0f;
> >>
> >> glClearColor(l_Red, l_Green, l_Blue, l_Alpha);
> >>
> >> glEnable(GL_DEPTH_TEST);
> >> glShadeModel(GL_SMOOTH);
> >>
> >> glPolygonMode(GL_FRONT, GL_LINE);
> >> glPolygonMode(GL_BACK, GL_LINE);
> >>
> >> glEnable(GL_CULL_FACE);
> >> glCullFace(GL_BACK);
> >> }
> >>
> >> void Reshape(int in_Width, int in_Height)
> >> {
> >> g_Client_Area_Size.setWidth(in_Width);
> >> g_Client_Area_Size.setHeight(in_Height);
> >>
> >> if (!Setup_Video())
> >> {
> >> SDL_Quit();
> >> g_Quit = true;
> >> return;
> >> }
> >>
> >> glViewport (0, 0, (GLsizei) g_Client_Area_Size.width(), (GLsizei)
> >> g_Client_Area_Size.height());
> >> glMatrixMode(GL_PROJECTION);
> >> glLoadIdentity();
> >> gluOrtho2D(0.0, g_Client_Area_Size.width(), 0.0,
> >> g_Client_Area_Size.height());
> >> glMatrixMode(GL_MODELVIEW);
> >> }
> >>
> >> bool Setup_Video(void)
> >> {
> >> g_SDL_VideoInfo = SDL_GetVideoInfo();
> >> if (g_SDL_VideoInfo == 0)
> >> {
> >> return false;
> >> }
> >>
> >> SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 8 );
> >> SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 8 );
> >> SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 8 );
> >> SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 );
> >> SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
> >>
> >> g_SDL_Surface = SDL_SetVideoMode(g_Client_Area_Size.width(),
> >> g_Client_Area_Size.height(), g_SDL_VideoInfo->vfmt->BitsPerPixel,
> >> SDL_OPENGL|SDL_RESIZABLE);
> >> if (g_SDL_Surface == 0)
> >> {
> >> return false;
> >> }
> >>
> >> return true;
> >> }
> >> _______________________________________________
> >> Qt-interest mailing list
> >> Qt-interest at trolltech.com
> >> http://lists.trolltech.com/mailman/listinfo/qt-interest
> >
> >
>
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