On 8 March 2010 22:31, drew stortz <drew.stortz@xxxxxxxxx> wrote: > > However, experiment tells me that this is far from true. When I > compile the same c file both ways, the object file produced with -O is > around 20% smaller than the one produced with all of the individual > optimizations added. Before filing a bug or investigating further, I > wanted to ask the list: is my interpretation of the -O switch > incorrect? Is it more than just the sum of those individual > optimizations? > Yes; My understanding is that all of the -O levels have features not controllable with individual flags.
