http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50733
--- Comment #2 from marcos_vc at coel dot com.br 2011-10-19 15:02:10 UTC --- In that case avr-gcc should print an error/warning when one try to access variables that way. I'm newbie for this specific target and this code compiles without any error or warning.
