Creating OpenGL 4.3 window fails with GLFW3

Question

I set up a minimal application to open a blank window with GLFW3:

#include <iostream>
#include <GL/glew.h>
#include <GLFW/glfw3.h>

void glfwErrorCallback(int error, const char *description)
{
   std::cerr << "GLFW error " << error << ": " << description << std::endl;
}

int main(int argc, char **argv)
{
   GLFWwindow* window;
   glfwSetErrorCallback(glfwErrorCallback);

   if(!glfwInit())
   {
      std::cerr << "Failed to initialize GLFW...\n";
      return -1;
   }

   glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
   glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
   glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

   window = glfwCreateWindow(1024, 768, "GLFW window", NULL, NULL);
   if(!window)
   {
      std::cerr << "Failed to open GLFW window...\n";
      glfwTerminate();
      return -1;
   }

   glewExperimental = GL_TRUE;
   if (glewInit())
   {
      std::cerr << "Failed to initialize GLEW...\n";
      glfwTerminate();
      return -1;
   }

   glfwMakeContextCurrent(window);

   while (glfwGetKey(window, GLFW_KEY_ESCAPE) != GLFW_PRESS && !glfwWindowShouldClose(window))
   {
      glfwSwapBuffers(window);
      glfwPollEvents();
   }

   glfwTerminate();
   return 0;
}

It results in the following error:

GLFW error 65540: Context profiles only exist for OpenGL version 3.2 and above
Failed to open GLFW window...

The application is run on Linux with Bumblebee's optirun. The code works when using freeglut instead of GLFW. What is wrong with the code that results in the error?

Answer 1

This is pretty simple:

glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4); // Major = 4
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); // Major was 4, now it is 3.

// Minor = ???   [Something < 2]

You need to use glfwWindowHint (GLFW_CONTEXT_VERSION_MINOR, 3); instead for the second hint.