Seg Fault with GLFW Users Guide Example

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1

grapedrink wrote on Monday, May 09, 2011:

Hi I’m getting a Segmentation Fault with the example in the GLFW 2.7 Users
Guide in section 2.4 titled a “Minimal GLFW Application”. I’m Mac OSX 10.6
with Xcode 3.2.5 installed.
I compiled GLFW 2.7 with “make cocoa-install” and then copied libglfw.dylib
over to /usr/local/lib

I’m building with:

g++ -Wall -o test test.cpp -I glfw-2.7 -Lglfw-2.7/lib/cocoa -lglfw -L/usr/X11/lib -lGL

I run with: ./test
and the code seg faults and only print out my “print 1” line.
Any ideas on what I’m doing wrong? I’m suspicious of the GL libraries or
something….

#include <GL/glfw.h>
#include <stdlib.h>
#include <iostream>
using std::cout;
int main( void ) {
  int running = GL_TRUE;
  // Initialize GLFW
  if( !glfwInit() )
    exit( EXIT_FAILURE );
  // Open an OpenGL window
  if( !glfwOpenWindow( 300,300, 0,0,0,0,0,0, GLFW_WINDOW ) ) {
    glfwTerminate();
    exit( EXIT_FAILURE );
  }
  // Main loop
  while( running ) {
 [b]   cout<<"print 1\n"; [/b]
   // OpenGL rendering goes here...
    glClear( GL_COLOR_BUFFER_BIT );
  cout<<"print 2\n";  
  // Swap front and back rendering buffers
    glfwSwapBuffers();
    // Check if ESC key was pressed or window was closed
    running = !glfwGetKey( GLFW_KEY_ESC ) && glfwGetWindowParam( GLFW_OPENED );
  }
  // Close window and terminate GLFW
  glfwTerminate();
  // Exit program
  exit( EXIT_SUCCESS );
}
2

elmindreda wrote on Monday, May 09, 2011:

Thank you for an exemplary bug report. I’ll verify this asap.

3

elmindreda wrote on Monday, May 09, 2011:

The problem is that you are linking against the X11 libraries while using the
Cocoa port of GLFW. Information on the correct use of GLFW on Mac OS X is in
section 4.2.5 of readme.html, also available here:
http://www.glfw.org/release-2.7.html

4

grapedrink wrote on Monday, May 09, 2011:

Thanks elmindreda!

I changed build line to include “-framework Cocoa -framework OpenGL” and
dropped the additional GL library as the documentation said.

My corrected build line is now:

g++ -Wall -o test test.cpp -I glfw-2.7 -Lglfw-2.7/lib/cocoa -lglfw -framework Cocoa -framework OpenGL