Re: -O vs. -O2

* Bulat Ziganshin:

cloning gcc policy may be a good choice. -O2 is the best optimization that "guaranteed" to make program faster and -O3 is for speculative optimization (those that may be breaked by unusual code or made program slower). not sure about -O1,

-O1 is supposed to yield somewhat optimized code with very good debugging information. Quality of debugging information at -O2 was really abysmal for a while, but it should be improving again.