Hi there. I am currently checking many code-versions for an atmel (atmega16) microcontroller. On GCC 3.4.5 I receive a WARNING for this line of code ("adress of register variable tmp1 requested"): sbi(tmp1,4); On GCC 4.0.2 I receive an ERROR ("adress of register variable tmp1 requested"). I compiled GCC 4.0.2 for AVR myself. When and where did this WARNING change to an error? How can I change this back in gcc 4.0.2? Thanks in advance. -- View this message in context: http://www.nabble.com/Warning-becomes-Error-t1204863.html#a3180948 Sent from the gcc - Help forum at Nabble.com.