Aha, do you get the same stacktrace that I have? Also, it seems you don't use -flto , so it has nothing to do with LTO. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple