I have recently started using the HOpenGL (version 1.01) under Linux running ghc 5.02.1 and have a question. How do I exit my application gracefully (apart from closing the window). In your examples you use
exitWith ExitSuccess
That however causes a:
TestGLUT: fatal error: GLUT_CBWindow_d7Tf: uncaught exception
Not sure whether that may help anyone in debugging, but I didn't use to have this problem until today, so today's changes might be related to the problem: I used to supply the window callback via createWindow, until I naively tried to create a DisplayList, to be passed to the window callback. After wondering just why genLists returned an empty list, I found that I had to move the call to genLists after createWindow. That meant I had to supply an empty window callback to createWindow (return ()), then allocate and fill my DisplayList, and finally register the proper window callback, with displayFunc. Now I also get the error on termination: e:\home\Haskell\hopengl\Tst.exe: fatal error: GLUT_CBWindow_d7TT: uncaught exception The sources mention that it is illegal to unregister a window callback - is registering a new one a problem? Claus PS. I had to twiddle my configuration slightly, to get HOpenGL (great stuff, Sven, btw;) compiled. From the archive, I gather that those missing commas are greencard-related and well-known, though. config: Win2k Cygwin (recent) GHC-5.02.2 (msi) GreenCard 2.03 (msi) HOpenGL-1.01 problems: figuring out how to escape the space in the GreenCard-path:-) --with-green-card="c:/Program\\ Files\GreenCard\green-card.exe" spaces in some .gc files would cause make depend to fail:-( GLUT_State.gc:217 GLUT_Init.gc:76 GLUT_CBWindow.gc:287 adding commas seems to have solved the issue