I compile it with GCC on MorphOS. It runs fine there. Not only on quick tests, but running it for days.
Are you sure it still doesn't do something illegal, even though it doesn't crash? I'd check it with the Wipeout program to see if it trashes memory or so.
I'd check it like this:
1) Launch SDK:Tools/logtool
2) Run SDK:Tools/Wipeout
3) Test your program and see if you get anything suspicious to the logtool window
