Hi, I want to use profile-guided optimization in my current development project. I have a doubt for which I can't find an answer anywhere. The basic idea of PGO is: 1. Build instrumented code 2. Run real-world representative tests to generate profile info. 3. Build code using profile info for optimizations. My doubt is whether I should build instrumented code (step 1) already with the same optimization options I want to finally use in step 3, or I'd get more realistical profile info if I compile step 1 without any optimization (or may be some intermediate option). Does anybody have any hints about this question? Thanks a lot, Juan Farré jafb@xxxxxxxxx