Steven Bosscher wrote:
One reason why it's not enabled is because it causes a huge compile time regression.
For the majority of Ada applications, as opposed to specific bench marks, we see little gain in -O2 over -O1 in any case, although that's for GCC 3.4 and it is always possible that GCC 4 is qualitatively different in this respect (I doubt it, optimizations are always less significant in real applications than you hope). Thus -O1 seems the general best choice if compile time is an issue. I think it is reasonable to figure that -O2 means I want good performance regardless of compile time. I guess the issue is what does "huge" mean, it is hard to discuss based on loaded adjectives taking the place of data :-)
