GLFW link not working correctly with mingw32 in C++ (?)

Question

Im trying to compile this example from the GLFW webpage:

http://www.glfw.org/documentation.html

#include <GLFW/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 */

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

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

    glfwTerminate();
    return 0;
}

Im using mingw32, and I downloaded the 32-bit windows binaries files from here http://www.glfw.org/download.html .

I put them in the respectives folders:

glfw3.dll in C:\\Programming\\MinGW32\\bin and a copy in my main.cpp folder.

glfw3dll.a and libglfw3.a in C:\\Programming\\MinGW32\\lib

GLFW folder with its .h files in C:\\Programming\\MinGW32\\include

To compile all I use this: g++ -lglfw3dll -lopengl32 main.cpp -Wall -o main.exe

And this are the errors Im getting:

D:\Users\Jorge\AppData\Local\Temp\ccA4Wc7r.o:animation.cpp:(.text+0xf): undefined reference to `glfwInit'
D:\Users\Jorge\AppData\Local\Temp\ccA4Wc7r.o:animation.cpp:(.text+0x4e): undefined reference to `glfwCreateWindow'
D:\Users\Jorge\AppData\Local\Temp\ccA4Wc7r.o:animation.cpp:(.text+0x5e): undefined reference to `glfwTerminate'
D:\Users\Jorge\AppData\Local\Temp\ccA4Wc7r.o:animation.cpp:(.text+0x71): undefined reference to `glfwMakeContextCurrent'
D:\Users\Jorge\AppData\Local\Temp\ccA4Wc7r.o:animation.cpp:(.text+0x7f): undefined reference to `glfwSwapBuffers'
D:\Users\Jorge\AppData\Local\Temp\ccA4Wc7r.o:animation.cpp:(.text+0x84): undefined reference to `glfwPollEvents'
D:\Users\Jorge\AppData\Local\Temp\ccA4Wc7r.o:animation.cpp:(.text+0x90): undefined reference to `glfwWindowShouldClose'
D:\Users\Jorge\AppData\Local\Temp\ccA4Wc7r.o:animation.cpp:(.text+0x9e): undefined reference to `glfwTerminate'
C:\Programming\MinGW32\bin/ld.exe: D:\Users\Jorge\AppData\Local\Temp\ccA4Wc7r.o: bad reloc address 0x20 in section `.eh_frame'
C:\Programming\MinGW32\bin/ld.exe: final link failed: Invalid operation
collect2.exe: error: ld returned 1 exit status

I can see that the linker is someway unable to link with glfw, but why ? and what am I doing worng ? Thanks

Answer 1

The command you used to compile is the problem. It should be:

g++ main.cpp -lglfw3dll -lopengl32 -lgdi32 -Wall -o main.exe

This is because you first compile main.cpp and then link the libraries to it. The gdi32 library is also needed when creating OpenGL context.