c++ - openGL精湛的源代码编译错误

Question

我刚刚开始使用 openGL Superbible 学习 openGL 编程。不幸的是，我无法编译任何示例。我在 Ubuntu 18.10 上，我使用官方存储库中的这些包准备了开发环境：

• mesa-common-dev（使用这些包，您可以在 /usr/include/GL/ 中获得头文件）

• libglfw3-dev（/usr/include/GLFW/ 中的头文件）

本书使用了一个小框架，入口点在 sb7.h 头文件中（在本书源代码中），sb7.h 然后指向 glfw3 和 gl3w（后者随本书的源代码给出，所以你不需要下载它）。

这是本书的第一个例子：

#ifndef _LINUX
#define _LINUX
#endif

// Include the "sb7.h" header file
#include "sb7.h"
// Derive my_application from sb7::application
class my_application : public sb7::application
{
public:
  // Our rendering function
  void render(double currentTime)
  {
    // Simply clear the window with red
    static const GLfloat red[] = { 1.0f, 0.0f, 0.0f, 1.0f };
    glClearBufferfv(GL_COLOR, 0, red);
  }
};
// Our one and only instance of DECLARE_MAIN
DECLARE_MAIN(my_application);

如果我尝试编译它（文件名为“main.cpp”），g++ main.cpp -lglfw我会收到以下错误：

/usr/bin/ld: /tmp/ccDOdloQ.o: in function `sb7::application::run(sb7::application*)':
main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x1c): undefined reference to `sb7::application::app'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x27e): undefined reference to `gl3wInit'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x29f): undefined reference to `gl3wIsSupported'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x2af): undefined reference to `gl3wDebugMessageCallback'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x2bd): undefined reference to `sb7::application::debug_callback(unsigned int, unsigned int, unsigned int, unsigned int, int, char const*, void*)'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x2c9): undefined reference to `gl3wEnable'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x2de): undefined reference to `sb6IsExtensionSupported(char const*)'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x2ee): undefined reference to `gl3wDebugMessageCallbackARB'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x2fc): undefined reference to `sb7::application::debug_callback(unsigned int, unsigned int, unsigned int, unsigned int, int, char const*, void*)'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x308): undefined reference to `gl3wEnable'
/usr/bin/ld: /tmp/ccDOdloQ.o: in function `sb7::application::glfw_onResize(GLFWwindow*, int, int)':
main.cpp:(.text._ZN3sb711application13glfw_onResizeEP10GLFWwindowii[_ZN3sb711application13glfw_onResizeEP10GLFWwindowii]+0x15): undefined reference to `sb7::application::app'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application13glfw_onResizeEP10GLFWwindowii[_ZN3sb711application13glfw_onResizeEP10GLFWwindowii]+0x1c): undefined reference to `sb7::application::app'
/usr/bin/ld: /tmp/ccDOdloQ.o: in function `sb7::application::glfw_onKey(GLFWwindow*, int, int, int, int)':
main.cpp:(.text._ZN3sb711application10glfw_onKeyEP10GLFWwindowiiii[_ZN3sb711application10glfw_onKeyEP10GLFWwindowiiii]+0x1c): undefined reference to `sb7::application::app'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application10glfw_onKeyEP10GLFWwindowiiii[_ZN3sb711application10glfw_onKeyEP10GLFWwindowiiii]+0x23): undefined reference to `sb7::application::app'
/usr/bin/ld: /tmp/ccDOdloQ.o: in function `sb7::application::glfw_onMouseButton(GLFWwindow*, int, int, int)':
main.cpp:(.text._ZN3sb711application18glfw_onMouseButtonEP10GLFWwindowiii[_ZN3sb711application18glfw_onMouseButtonEP10GLFWwindowiii]+0x18): undefined reference to `sb7::application::app'
/usr/bin/ld: /tmp/ccDOdloQ.o:main.cpp:(.text._ZN3sb711application18glfw_onMouseButtonEP10GLFWwindowiii[_ZN3sb711application18glfw_onMouseButtonEP10GLFWwindowiii]+0x1f): more undefined references to `sb7::application::app' follow
/usr/bin/ld: /tmp/ccDOdloQ.o: in function `my_application::render(double)':
main.cpp:(.text._ZN14my_application6renderEd[_ZN14my_application6renderEd]+0x14): undefined reference to `gl3wClearBufferfv'
collect2: error: ld returned 1 exit status

阅读消息时，我认为 gl3w 库有问题，所以我从github 存储库下载了它，并将它和 glcorearb.h 放入/usr/include/GL/，将 sb7.h 中的指向该#include文件夹。最终，我编译了 gl3w.c 并使用 g++ 将其链接到 main.cpp，如下所示：

1. g++ -c gl3w.c
2. g++ -c main.cpp
3. g++ gl3w.o main.o

但是当我执行 3) 我得到其他错误：

/usr/bin/ld: gl3w.o: in function `open_libgl()':
gl3w.c:(.text+0x16): undefined reference to `dlopen'
/usr/bin/ld: gl3w.c:(.text+0x4d): undefined reference to `dlsym'
/usr/bin/ld: gl3w.o: in function `close_libgl()':
gl3w.c:(.text+0x6f): undefined reference to `dlclose'
/usr/bin/ld: gl3w.o: in function `get_proc(char const*)':
gl3w.c:(.text+0xc5): undefined reference to `dlsym'
/usr/bin/ld: main.o: in function `sb7::application::run(sb7::application*)':
main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x1c): undefined reference to `sb7::application::app'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x21): undefined reference to `glfwInit'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x7c): undefined reference to `glfwWindowHint'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x92): undefined reference to `glfwWindowHint'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0xb3): undefined reference to `glfwWindowHint'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0xd4): undefined reference to `glfwWindowHint'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0xe3): undefined reference to `glfwWindowHint'
/usr/bin/ld: main.o:main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0xf2): more undefined references to `glfwWindowHint' follow
/usr/bin/ld: main.o: in function `sb7::application::run(sb7::application*)':
main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x13f): undefined reference to `glfwGetPrimaryMonitor'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x172): undefined reference to `glfwCreateWindow'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x1c8): undefined reference to `glfwMakeContextCurrent'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x1e2): undefined reference to `glfwSetWindowSizeCallback'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x1fc): undefined reference to `glfwSetKeyCallback'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x216): undefined reference to `glfwSetMouseButtonCallback'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x230): undefined reference to `glfwSetCursorPosCallback'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x24a): undefined reference to `glfwSetScrollCallback'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x279): undefined reference to `glfwSetInputMode'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x2af): undefined reference to `gl3wDebugMessageCallback'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x2bd): undefined reference to `sb7::application::debug_callback(unsigned int, unsigned int, unsigned int, unsigned int, int, char const*, void*)'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x2c9): undefined reference to `gl3wEnable'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x2de): undefined reference to `sb6IsExtensionSupported(char const*)'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x2ee): undefined reference to `gl3wDebugMessageCallbackARB'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x2fc): undefined reference to `sb7::application::debug_callback(unsigned int, unsigned int, unsigned int, unsigned int, int, char const*, void*)'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x308): undefined reference to `gl3wEnable'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x339): undefined reference to `glfwGetTime'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x355): undefined reference to `glfwSwapBuffers'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x35a): undefined reference to `glfwPollEvents'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x372): undefined reference to `glfwGetKey'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x39b): undefined reference to `glfwWindowShouldClose'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x3e7): undefined reference to `glfwDestroyWindow'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application3runEPS0_[_ZN3sb711application3runEPS0_]+0x3ec): undefined reference to `glfwTerminate'
/usr/bin/ld: main.o: in function `sb7::application::glfw_onResize(GLFWwindow*, int, int)':
main.cpp:(.text._ZN3sb711application13glfw_onResizeEP10GLFWwindowii[_ZN3sb711application13glfw_onResizeEP10GLFWwindowii]+0x15): undefined reference to `sb7::application::app'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application13glfw_onResizeEP10GLFWwindowii[_ZN3sb711application13glfw_onResizeEP10GLFWwindowii]+0x1c): undefined reference to `sb7::application::app'
/usr/bin/ld: main.o: in function `sb7::application::glfw_onKey(GLFWwindow*, int, int, int, int)':
main.cpp:(.text._ZN3sb711application10glfw_onKeyEP10GLFWwindowiiii[_ZN3sb711application10glfw_onKeyEP10GLFWwindowiiii]+0x1c): undefined reference to `sb7::application::app'
/usr/bin/ld: main.cpp:(.text._ZN3sb711application10glfw_onKeyEP10GLFWwindowiiii[_ZN3sb711application10glfw_onKeyEP10GLFWwindowiiii]+0x23): undefined reference to `sb7::application::app'
/usr/bin/ld: main.o: in function `sb7::application::glfw_onMouseButton(GLFWwindow*, int, int, int)':
main.cpp:(.text._ZN3sb711application18glfw_onMouseButtonEP10GLFWwindowiii[_ZN3sb711application18glfw_onMouseButtonEP10GLFWwindowiii]+0x18): undefined reference to `sb7::application::app'
/usr/bin/ld: main.o:main.cpp:(.text._ZN3sb711application18glfw_onMouseButtonEP10GLFWwindowiii[_ZN3sb711application18glfw_onMouseButtonEP10GLFWwindowiii]+0x1f): more undefined references to `sb7::application::app' follow
/usr/bin/ld: main.o: in function `my_application::render(double)':
main.cpp:(.text._ZN14my_application6renderEd[_ZN14my_application6renderEd]+0x14): undefined reference to `gl3wClearBufferfv'
collect2: error: ld returned 1 exit status

此时我尝试使用已经包含 gl3w.c 的 gl3w.h的单个文件版本。我把两个头文件/usr/include/GL/放进去，然后我把 sb7.h 指向那个版本的库，但是出现了其他错误g++ main.cpp -lglfw：

In file included from main.cpp:6:
sb7.h: In member function ‘virtual void sb7::application::run(sb7::application*)’:
sb7.h:137:9: error: ‘gl3wInit’ was not declared in this scope
         gl3wInit();
         ^~~~~~~~
sb7.h:137:9: note: suggested alternative: ‘glfwInit’
         gl3wInit();
         ^~~~~~~~
         glfwInit
sb7.h:147:17: error: ‘gl3wIsSupported’ was not declared in this scope
             if (gl3wIsSupported(4, 3))
                 ^~~~~~~~~~~~~~~
sb7.h:147:17: note: suggested alternative: ‘gl3w_is_supported’
             if (gl3wIsSupported(4, 3))
                 ^~~~~~~~~~~~~~~
                 gl3w_is_supported

我#define GL3W_IMPLEMENTATION之前也#include "GL/gl3w.h"按照 gl3w 的单文件版本的文档中的建议添加了，但没有运气。我在另一本书的源代码中遇到了同样的错误。

希望有人能帮助我。谢谢你。

标签： c++copenglg++glfw