How to fix "unresolved external symbol _gladLoadGLLoader referenced in function _main" and "unresolved external symbol _glad_glViewport"?

Question

I keep getting the unresolved external symbol' error when building the program. However, the program compiles fine. I'm using the GLFW and GLAD libraries.

#include <glad/glad.h>
#include <GLFW/glfw3.h>

#include <iostream>

void framebuffer_size_callback(GLFWwindow* window, int width, int height);

//#undef main
int main() {
    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
    GLFWwindow* window = glfwCreateWindow(800, 600, "LearningOpenGL", NULL, NULL);

    if (window == NULL) {
        std::cout << "Failed To Create Window" << std::endl;
        glfwTerminate();
        return -1;
    }
    glfwMakeContextCurrent(window);

    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);

    if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
        std::cout << "Failed to initialize GLAD" << std::endl;
        return -1;
    }

    while (!glfwWindowShouldClose(window))
    {
        glfwSwapBuffers(window);
        glfwPollEvents();
    }

    glViewport(0, 0, 800, 600);

    glfwTerminate();
    return 0;
}

void framebuffer_size_callback(GLFWwindow* window, int width, int height) {
    glViewport(0, 0, width, height);
}

I keep getting the same 2 errors:

Main.obj : error LNK2019: unresolved external symbol _gladLoadGLLoader referenced in function _main

Main.obj : error LNK2001: unresolved external symbol _glad_glViewport

*LNK2019* is a linker error, not a compile error. So the code is almost irrelevant. When you us glad then you've to compile "glad.c" and to link the resulting object file. — Rabbid76, Oct 19 '19 at 07:44

Nick · Accepted Answer · 2019-10-20T02:00:10.283

45

go to project name -> add -> existing item and then add glad.c

edited Oct 20 '19 at 02:00

answered Oct 20 '19 at 01:54

Nick

471
5
5

thanks a ton, I added the file via explorer folder and thought it'll detect lol. – Mahi Apr 01 '22 at 07:17

score 1 · Answer 2 · answered Jul 24 '23 at 01:02

1

You should actually add the glad.c file that came in the 'src' directory of GLAD.

answered Jul 24 '23 at 01:02

Bearsie

11
1

Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Jul 27 '23 at 12:33

How to fix "unresolved external symbol _gladLoadGLLoader referenced in function _main" and "unresolved external symbol _glad_glViewport"?

2 Answers2