I tried GCC 4 on some of my code. No problems, but there complaints that exit() was redefined. Executables are smaller than before. Dhrystone 2 was somewhat slower using the same -O3 flag. -- Chuck Forsberg caf@xxxxxxxx www.omen.com 503-614-0430 Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc "The High Reliability Software" 10255 NW Old Cornelius Pass Portland OR 97231 FAX 629-0665