[Qt-interest] Compiling OpenGL/SDL application on Windows, linker problems, undefined reference to qMain(int, char**)
Benjamin Sonnemann
b.sonnemann at gmail.com
Sun Mar 22 10:05:39 CET 2009
Well i went through the source code of Qt looking for NEEDS_QT_MAIN(or so,
its a define) and as its looks its only needed for gcc and Borland.
-mwindows is not a library switch but a compil switch.
So i just tested your main.cpp with my Visual Studio, SDL 1.3 and Qt 4.5.0
and it compiled fine with Qt -= QtGui.
Your problem lies here:
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**)'
qt compiled with gcc expects a qMain as it has its own main. You could try
sth like this:
int main(int argc, char** argc){
qMain(argc, argv);
}
and put all your logic into qMain, but most probably it generates a multiple
definition linker error.
Get the free visual studio compiler and use it if you only do windows
development.
Well dont want to sound rude, but what are you trying there seriously. I
dont know hat aurora is and if its dependant on qt
but all your code in Main.cpp can be easily done witout qt at all! Take a
look at std::string and std::cout.
Benjamin Sonnemann
On Sun, Mar 22, 2009 at 1:14 AM, David Rappo <david.rappo at gmail.com> wrote:
> Hi Ben,
>
> I removed the line:
>
> QApplication l_Application(argc, argv);
>
> I was also calling QMessagebox::warning in a few places, so I
> commented those lines out as well. I also removed any references in my
> pro files to my own libraries.
>
> I've pasted the new pro file and new version of Main.cpp below.
>
> I'm still encountering the same linker errors.
>
> The order that I link with mingw, SDLmain, and SDL is the same order
> recommended in the Window's FAQ for SDL.
>
> http://www.libsdl.org/faq.php?action=listentries&category=4
>
> Q: I get "Undefined reference to 'WinMain at 16'"
> A: Under Visual C++, you need to link with SDLmain.lib. Under the gcc
> build environments including Dev-C++, you need to link with the output
> of "sdl-config --libs", which is usually: -lmingw32 -lSDLmain -lSDL
> -mwindows
>
> mwindows is not installed on my system. It seems to be an old library
> that is no longer used. The only SDL related forum posts I found that
> mentioned it were dated around 2003.
>
> So, I'm still stuck and getting really frustrated. Adding QT += gui to
> the pro file did not affect the linker errors (same output as before).
>
> Also, declaring an instance of QApplication in main(int, ch**) does
> not cause any problems when building on Linux. Its just on Windows.
>
> I'm using the open source version of Qt 4.5 on Windows Vista (64-bit
> version).
>
> Thanks again,
>
> David
>
>
> // Linker errors
>
> C:\Users\David\Development\Tetris_SDL\Tetris>mingw32-make
> 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:\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:/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
> mingw32-make[1]: Leaving directory
> `C:/Users/David/Development/Tetris_SDL/Tetris'
> mingw32-make -f Makefile.Release all
> mingw32-make[1]: Entering directory
> `C:/Users/David/Development/Tetris_SDL/Tetris'
> g++ -c -O2 -frtti -fno-exceptions -Wall -DUNICODE
> -DQT_LARGEFILE_SUPPORT -DQT_NO_DEBUG_OUTPUT -DQT_NO_WARNING_OUTPUT
> -DQT_NO_DEBUG -DQT_DLL -DQT_NO_DEBUG -DQT_OPENGL_LIB -DQT_CORE_LIB
> -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN
> -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:\Qt\MinGW\qt-win-opensource-src-4.5.0\include\ActiveQt"
> -I"release" -I"."
> -I"c:\Qt\MinGW\qt-win-opensource-src-4.5.0\mkspecs\win32-g++" -o
> release\Main.o Main.cpp
> In file included from
> C:/SDL/SDL_Win32_MinGW/SDL-1.2.13/include/SDL/SDL.h:28,
> from Main.cpp:4:
> 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:2:
>
> 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:/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 -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**)'
> collect2: ld returned 1 exit status
> mingw32-make[1]: *** [release\Tetris.exe] Error 1
> mingw32-make[1]: Leaving directory
> `C:/Users/David/Development/Tetris_SDL/Tetris'
> mingw32-make: *** [release-all] Error 2
>
> C:\Users\David\Development\Tetris_SDL\Tetris>
>
> ######################################################################
> # Tetris.pro
> ######################################################################
>
> TEMPLATE = app
>
> DEPENDPATH += .
>
> INCLUDEPATH += .
> INCLUDEPATH += $(LIBVECTORMATH_PATH)/scalar/cpp
> INCLUDEPATH += $(SDL_INCLUDE_PATH)
> #INCLUDEPATH += $(AURORA_PATH)/Aurora_Debug_Library
> #INCLUDEPATH += $(AURORA_PATH)/Aurora_Math_Library
> #INCLUDEPATH += $(AURORA_PATH)/Aurora_Render_Library
>
> CONFIG += debug_and_release
> CONFIG += build_all
>
> CONFIG(debug, debug|release) {
> win32: CONFIG += console
> #LIBS += -L$(AURORA_PATH)/Binary -lAurora_Render_Library_Debug
> #LIBS += -L$(AURORA_PATH)/Binary -lAurora_Math_Library_Debug
> #LIBS += -L$(AURORA_PATH)/Binary -lAurora_Debug_Library_Debug
> TARGET = Tetris_Debug
> } else {
> DEFINES += QT_NO_DEBUG_OUTPUT
> DEFINES += QT_NO_WARNING_OUTPUT
> DEFINES += QT_NO_DEBUG
> #LIBS += -L$(AURORA_PATH)/Binary -lAurora_Render_Library
> #LIBS += -L$(AURORA_PATH)/Binary -lAurora_Math_Library
> #LIBS += -L$(AURORA_PATH)/Binary -lAurora_Debug_Library
> TARGET = Tetris
> }
>
> LIBS += -LC:/MinGW/lib -lmingw32
> LIBS += -L$(SDL_LIBRARY_PATH) -lSDLmain
> LIBS += -L$(SDL_LIBRARY_PATH) -lSDL
>
> QT += opengl
> QT -= gui
>
> ######################################################################
> # Headers
> ######################################################################
>
> ######################################################################
> # Sources
> ######################################################################
>
> SOURCES += Main.cpp
>
> // Main.cpp
>
> #include <QtCore>
> #include <QtOpenGL>
> #include "vectormath_aos.h"
> #include "SDL.h"
> //#include "Aurora_Debug_Library.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;
>
> if ( SDL_Init(SDL_INIT_VIDEO) == -1 )
> {
> SDL_Quit();
> return 1;
> }
>
> if (!Setup_Video())
> {
> 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;
> }
>
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