Hi All,
I'm currently having some problems linking with OpenGL under cygwin. I was hoping somebody who understands the system might be able to offer some advice.
The problem I'm having is that when I try to link my object files together with "-lglut32 -lglu32 -lopengl32" I get messages stating that there are "undefined reference"(s) to "_glBegin", amonst other symbols.
Searching through the archives I've spotted a message stating that this means I'm compiling with the wrong headers (The symbols should be of the form _glBegin at 4'). It's at this point that I've lost the thread. My code contains "#include <GL/glut.h>" and doing a 'find / -name glut.h' only shows the one file located in /usr/include/GL. Similarly doing the same find for gl.h gives me one in /usr/include/GL and one in /usr/include/w32api/GL.
My compile command is "gcc -c <source file>" My link command is "gcc -o <exe name> <object files> -lglut32 -lglu32 -lopengl32"
Am I missing something simple?
Thanks for any help you can provide
Paul
Paul,
In the past, 99% of the time such problem occured, people were _not_ linking with arguments in the appropriate order.
-lglut32 -lglu32 -lopengl32
must come after all objects on the command line.
Please try compiling and linking this test program; copy the following lines to helloGlut.c :
/*-------------------------- helloGlut.c start ----------------------------*/ #include <GL/glut.h>
void display_func()
{
glClear(GL_COLOR_BUFFER_BIT);
}int main()
{
glutCreateWindow("Hello GLUT!");
glutDisplayFunc(display_func);
glutMainLoop();
return 0;
}
/*-------------------------- helloGlut.c end------------------------------*/And compile and link with _the exact_ following lines: gcc -c helloGlut.c gcc -o helloGlut helloGlut.o -lglut32 -lglu32 -lopengl32
If you get any error messages, report them here verbatim and we'll work from there. Also send the ouput of "cygcheck -c" to a file and attach it to your email.
André Bleau, Cygwin's OpenGL package maintainer.
email: bleau at igb dot umontreal dot ca (Fight SPAM: encode your email-address)
Please address all questions and problem reports about Cygwin's OpenGL package to [EMAIL PROTECTED] .
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