On 24 November 2014 at 15:46, Calvin Morrison <mutanttur...@gmail.com> wrote: > On 24 November 2014 at 15:44, koneu <kone...@googlemail.com> wrote: >> Greetings. >> >> Markus Wichmann wrote: >>> compiling with -O3 will result in some broken binaries. Somewhere. Why? >> >> Because -O3 is very aggressive and should NOT be used. Especially not >> when compiling/bootstrapping a system. In most cases it makes things >> buggier and bigger, in some cases even slower. Use -O2. > > I've used -O3 for a long time in several projects that are heavily > tuned and not noticed any issues. I think there is a large stigma > around -O3 but if you just take a few minutes to read about -O3 you'll > learn quickly what is safe to use and what could cause problems. You > seem like a hater.
before you FUD, there's lots of good stuff, like vectorization, and my two favorites -finline-functions, which is great for having efficient code, while making sure you code is readable. -funswitch-loops, this is a great optimization which helps deal with stupid programmers
