Xavier Roche <xav...@debian.org> writes: > I have a rather silly question: most (all ?) packages are built by > default with -02 - something which is inherited from autotool's '-g -O2' > default flagsd, I presume.
> Is -O3 considered too dangerous ? (AFAICS, potential issues are mainly > present in O2) Or is it considered worthless because the performance > gain would be really low ? Historically, -O3 has usually been slower than -O2 for a lot of software because the aggressive loop unrolling increases code size and interferes with processor caching strategies. I don't know if that's now been fixed in GCC, but that's probably much of the historical reason. My impression is that most people using GCC use -O2, so it's the best-tested path. -- Russ Allbery (r...@debian.org) <http://www.eyrie.org/~eagle/> -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/87ha48gzml....@windlord.stanford.edu
