Hi Leo, > I would like to obtain just variable reordering, not all "-O2" > package; reading in the gcc manual, I singularly tried with all > options in "-O2" but no one reorders the variables. What do you mean by that? Do you mean that use used -O2 and then disabled all-but-one of the optimizations (of those optimizations that are toggle-able through -f switches)? --Eljay