I'm not an 64-bit user, but if you need target specific optimization, passing -Op and/or -Cf might help. Call fpc -i for possible values. -- View this message in context: http://free-pascal-general.1045716.n5.nabble.com/64-bit-tp4408519p4410174.html Sent from the Free Pascal - General mailing list archive at Nabble.com.