Why does undefined reference occur?

Question

css

Hello
I downloaded the binary files of the glut library, included the glut.h header file and specified qmake LIBS += -l glut32(the library in the source folder), but the linker gives an undefined reference error. The assembler finds the library itself, please tell me what could be the matter

Answer 1

The prize of the shitcode of the year is yours unambiguously, and the problem is that the variables x and y are defined before the click is processed and then do not change, and even the fact that you change the variables num and numm will not give you anything, since x and y will remain the same. Here you are constantly adding the same variables to your transform

Answer 2

ps the name of the library has changed

g++ main.cpp -o main.exe -lglfw3 
//Компиляция происходит без проблем, а линковка дает ошибки

1) https://www.glfw.org downloaded.
2) https://cygwin.com downloaded/installed/configured
3)

main.cpp

#include "glfw3.h"

int main(void)
{
    GLFWwindow* window;

    /* Initialize the library */
    if (!glfwInit())
        return -1;

    /* Create a windowed mode window and its OpenGL context */
    window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
    if (!window)
    {
        glfwTerminate();
        return -1;
    }

    /* Make the window's context current */
    glfwMakeContextCurrent(window);

    /* Loop until the user closes the window */
    while (!glfwWindowShouldClose(window))
    {
        /* Render here */
        glClear(GL_COLOR_BUFFER_BIT);

        /* Swap front and back buffers */
        glfwSwapBuffers(window);

        /* Poll for and process events */
        glfwPollEvents();
    }

    glfwTerminate();
    return 0;
}

4) g++ main.cpp -o main.exe -L"C:\project\libs" -lglfw3 -lgdi32 -lopengl32
5) opengl32.a is in cygwin\lib\w32api
6) if something like undefined reference to `[email protected]'opengl32 pops up during linking .a must be placed in project\libs

hello world!