Warning becomes Error

Wed Mar 1 10:42:00 GMT 2006

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. 
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