I once had a bug in my program where it would work correctly only on -O3 (not quite correctly, but good enough for me to not notice). After a lot of head scratc

I once had a bug in my program where it would work correctly only on -O3 (not quite correctly, but good enough for me to not notice). After a lot of head scratching I ran clang's static analyzer [0] and it found it to be an uninitialized variable. On -O3 compiler was reusing other variable, which happened to be very close to what I needed. [0] http://i.imgur.com/lqs4FNn.png http://i.imgur.com/lqs4FNn.png