Simple openGL program won't pass compile

Question

I'm trying to compile a very simple program in openGL:

#include <stdio.h>
#include <stdlib.h>
#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <glm/glm.hpp>

using namespace glm;

int main()
{
    if( !glfwInit() )
    {
            fprintf( stderr, "Failed to initialize GLFW\n");
            return -1;
    }

    glfwWindowHint(GLFW_SAMPLES, 4); // 4x antialiasing
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); // Use OpenGL 3.X
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3); // Use openGL X.3
    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);  
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); 

    // Open a window and create OpenGL context
    GLFWwindow* window; // May be needed to make it global
    window = glfwCreateWindow(1024, 768, "Tutorial 01", NULL, NULL);
    if(window == NULL)
    {
            fprintf(stderr, "Failed to pen GLFW window. If you have Intel GPU they are not 3.3 compatible. Try the 2.1 version of the tutorial.\n");
            glfwTerminate();
            return -1;
    }
    glfwMakeContextCurrent(window); // Initialize GLEW
    glewExperimental=true; // Needed in core profile
    if(glewInit() != GLEW_OK)
    {
            fprintf(stderr, "Failed to initialize GLEW.\n");
            return -1;
    }
}

However when i try to compile it with g++ i'm getting the following errors:

In function `main':
playground.cpp:(.text+0x9): undefined reference to `glfwInit'
playground.cpp:(.text+0x49): undefined reference to `glfwWindowHint'
playground.cpp:(.text+0x58): undefined reference to `glfwWindowHint'
playground.cpp:(.text+0x67): undefined reference to `glfwWindowHint'
playground.cpp:(.text+0x76): undefined reference to `glfwWindowHint'
playground.cpp:(.text+0x85): undefined reference to `glfwWindowHint'
playground.cpp:(.text+0xa4): undefined reference to `glfwCreateWindow'
playground.cpp:(.text+0xd2): undefined reference to `glfwTerminate'
playground.cpp:(.text+0xe5): undefined reference to `glfwMakeContextCurrent'
playground.cpp:(.text+0xeb): undefined reference to `glewExperimental'
playground.cpp:(.text+0xf1): undefined reference to `glewInit'
collect2: error: ld returned 1 exit status

I've found some posts to this specific problem and the solution seems to be to pass the required libraries as arguments to g++. However, when i do that, the problem still persists.

This is how i compile the code:

g++ -lglfw3 -pthread -lGLEW -lGLU -lGL -lrt -lXrandr -lXxf86vm -lXi -lXinerama -lX11 -o openGLWindow openGLWindow.cpp

Any help would be appreciated...

Answer 1

when i try to compile it with g++ i'm getting the following errors:

No, your compilation is just fine. You are getting link errors, not compile errors.

The reason for your link errors is that your link command line is completely backwards. Try this instead:

g++ -pthread -o openGLWindow openGLWindow.cpp -lglfw3 -lGLEW -lGLU -lGL -lXrandr -lXxf86vm -lXi -lXinerama -lX11 -lrt -ldl

I am not sure the order of libraries above is correct, but it's certainly better than what you have. The order of sources, object files, and libraries on command line matters.