Question

编译代码时收到错误消息。输出是下一个：

debug/display.o: In function `ZN7Display5clearEffff':
D:\Qt_Projects\TestProj\build-SomeOpenGLTest-Desktop_Qt_5_5_1_MinGW_32bit-Debug/../SomeOpenGLTest/display.cpp:37: undefined reference to `glClearColor@16'
D:\Qt_Projects\TestProj\build-SomeOpenGLTest-Desktop_Qt_5_5_1_MinGW_32bit-Debug/../SomeOpenGLTest/display.cpp:38: undefined reference to `glClear@4'
D:/Qt_Projects/TestProj/SomeOpenGLTest/lib/SDL2main.lib(./Release/SDL_windows_main.obj):(.text[_main]+0x5): undefined reference to `SDL_SetMainReady'
D:/Qt_Projects/TestProj/SomeOpenGLTest/lib/SDL2main.lib(./Release/SDL_windows_main.obj):(.text[_main]+0x12): undefined reference to `SDL_main'
D:/Qt/Tools/mingw492_32/bin/../lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/ld.exe: D:/Qt_Projects/TestProj/SomeOpenGLTest/lib/SDL2main.lib(./Release/SDL_windows_main.obj): bad reloc address 0x8 in section `.text[_WinMain@16]'
collect2.exe: error: ld returned 1 exit status

我所要做的就是连接 SDL2 和 glew 库来投影和绘制一些窗口。我的 .pro 文件如下所示：

TEMPLATE = app
CONFIG += console c++11
CONFIG -= app_bundle
CONFIG -= qt
SOURCES += main.cpp \
    display.cpp

INCLUDEPATH += $$PWD/include

LIBS += -L$$PWD/lib \
            -lglew32 \
            -lglew32s \
            -lSDL2 \
            -lSDL2main \
            -lSDL2test

HEADERS += \
    display.h

我的 include 文件夹包含来自库的所有 .hpp 文件，还有 lib 文件夹，所有 .lib < / em>来自库的文件。我很确定，这个问题出现在连接库中，但以防万一给你我的班级代码：

的 display.h

#ifndef DISPLAY_H #define DISPLAY_H #include <string> #include <SDL2/SDL.h> class Display { public: Display(int width = 360, int height = 360, const std::string &title = "Title"); ~Display(); void clear(float r, float g, float b, float a); void update(); bool isClosed() const; private: SDL_Window *mWindow; SDL_GLContext mGLContext; bool mIsClosed; }; #endif // DISPLAY_H

display.cpp

#include "display.h" #include <GL/glew.h> #include <iostream> Display::Display(int width, int height, const std::string &title) { SDL_Init(SDL_INIT_EVERYTHING); 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_ALPHA_SIZE, 8); SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE, 32); SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1); mWindow = SDL_CreateWindow(title.c_str(), SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, width, height, SDL_WINDOW_OPENGL); // Context need in order to OpenGL take control of window from OS mGLContext = SDL_GL_CreateContext(mWindow); GLenum status = glewInit(); if (status != GLEW_OK) { std::cerr << "Glew failed to initialize!" << std::endl; } } Display::~Display() { SDL_GL_DeleteContext(mGLContext); SDL_DestroyWindow(mWindow); SDL_Quit(); } void Display::clear(float r, float g, float b, float a) { glClearColor(r, g, b, a); glClear(GL_COLOR_BUFFER_BIT); } void Display::update() { SDL_GL_SwapWindow(mWindow); SDL_Event e; while (SDL_PollEvent(&e)) { if (e.type == SDL_QUIT) { mIsClosed = true; } } } bool Display::isClosed() const { return mIsClosed; }

提前致谢。

Answer 1

就我而言，我需要将这行代码包含在 .pro 文件中：

LIBS += -L[my_compiler_directory]/lib -lopengl32

通过这种方式，我摆脱了与'glFunctions'的未定义引用相关的错误。在此之后，感谢answer of gefa，我改变了 .lib 文件的顺序，如下所示：

LIBS += -L$$PWD/lib \
            -lglew32 \
            -lglew32s \
            -lSDL2main \
            -lSDL2 \
            -lSDL2test

所以-lSDL2main位于其他SDL2库的顶部。之后，一切正常。

使用SDL和glew时，Qt Creator中的未定义引用错误

1 个答案: