Linker error in Dev C++: undefined reference to 'glfwInit' [duplicate] - c++

Question

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What is an undefined reference/unresolved external symbol error and how do I fix it?
(39 answers)
Closed 7 years ago.
I'm trying to follow this tutorial for OpenGL. I originally copied the code by hand, but that wasn't working, so I've copy-pasted the code straight from the website. I keep getting this error:
[Linker error] undefined reference to 'glfwInit'
from this code (which feels longer than necessary):
//C++ standard headers
#include <stdio.h>
#include <stdlib.h>
//GLEW header
#include <GL/glew.h>
//GLFW header
#include <GL/glfw3.h>
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); // We want OpenGL 3.3
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // To make MacOS happy; should not be needed
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); //We don't want the old OpenGL
// Open a window and create its OpenGL context
GLFWwindow* window; // (In the accompanying source code, this variable is global)
window = glfwCreateWindow( 1024, 768, "Tutorial 01", NULL, NULL);
if( window == NULL )
{
fprintf( stderr, "Failed to open GLFW window. If you have an Intel GPU, they are not 3.3 compatible. Try the 2.1 version of the tutorials.\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;
}
// Ensure we can capture the escape key being pressed below
glfwSetInputMode(window, GLFW_STICKY_KEYS, GL_TRUE);
do{
// Draw nothing, see you in tutorial 2 !
// Swap buffers
glfwSwapBuffers(window);
glfwPollEvents();
}
// Check if the ESC key was pressed or the window was closed
while( glfwGetKey(window, GLFW_KEY_ESCAPE ) != GLFW_PRESS &&
glfwWindowShouldClose(window) == 0 );
}
I've got no idea why it's not compiling. Anyone know what's going on?
EDIT: I'm using Dev-C++, as stated in the title.

Answer 1

undefined reference to 'glfwInit'
means that the linker did not find the library where glfwInit() is defined. You have to add glfw3.a to your linker input. Indeed, Dev-C++ use MinGW so unlike Visual Studio, the libraries can not be .lib.
To do that with Dev-C++, go to your 'project options', 'parameters', and 'add a library'. Then browse the explorer to find the glfw3.a I mentioned (usually in GLFW-<version>/lib/).