CODEWITHSUNDEEP
c++qtsdlqt-creatorqmake
Scott
Scott

Reputation: 448

SDL2 undefined reference sdl_Main in QtCreator

Im trying to use QtCreator to create a project including SDL2. But SDL is failing to compile correctly and I can't see the error.

My QtCreator .pro file

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = Psiora
TEMPLATE = app

SOURCES += main.cpp\
        ui_mainwindow.cpp

HEADERS  += ui_mainwindow.h

FORMS    += ui_mainwindow.ui

INCLUDEPATH += "D:\devel\SDL2-2.0.3\i686-w64-mingw32\include\SDL2"

LIBS += -L"D:\devel\SDL2-2.0.3\i686-w64-mingw32\lib" \
        -lmingw32 \
        -mwindows \
        -lSDL2main \
        -lSDL2

Main.cpp

#include "ui_mainwindow.h"
#include <QApplication>

#define SDL_MAIN_HANDLED //Let QT Supply WinMain
#include "SDL.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    UI_mainWindow win;
    win.show();

    return app.exec();
}

Compiler errors

g++ -Wl,-subsystem,windows -mthreads -o debug\Psiora.exe debug/main.o debug/ui_mainwindow.o debug/moc_ui_mainwindow.o -lglu32 -lopengl32 -lgdi32 -luser32 -lqtmaind -LD:\devel\SDL2-2.0.3\i686-w64-mingw32\lib -lmingw32 -mwindows -lSDL2main -lSDL2 -LD:\devel\Qt\5.2.1\mingw48_32\lib -lQt5Widgetsd -lQt5Guid -lQt5Cored

D:\devel\SDL2-2.0.3\i686-w64-mingw32\lib/libSDL2main.a(SDL_windows_main.o): In function `console_main':

/Users/slouken/release/SDL/SDL2-2.0.3-source/foo-x86/../src/main/windows/SDL_windows_main.c:140: undefined reference to `SDL_main' collect2.exe: error: ld returned 1 exit status

I don't understand why SDL is giving an undefined reference to sdl_Main, when it has been linked in the correct order. I also don't get where this "/Users/slouken/release/SDL/SDL2-2.0.3-source/foo-x86/../src/main/windows/" has come from when there is no such path on my computer, nor have I added the path myself.

My understanding is the SDL_Main provides WinMain however I wish to use the WinMain provided by Qt instead so I have defined the SDL_MAIN_HANDLED define to stop SDL using SDL_Main.

Addition Information:

Upvotes: 1

Views: 1945

Answers (1)

L&#225;szl&#243; Papp
L&#225;szl&#243; Papp

Reputation: 53215

Add this to your project file to solve this:

win32:QMAKE_LIBS_QT_ENGTRY -= -lqtmain
win32-g++:DEFINES -= QT_NEEDS_QMAIN

or

CONFIG-= windows
QMAKE_LFLAGS += $$QMAKE_LFLAGS_WINDOWS

Upvotes: 3

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