Hi all :D I think what "-march=your_arch -O2" it's enough, because -O3 it's highest but have some details (http://gentoo-wiki.com/CFLAGS#-O2_or_-O3.3F). My guess is "-march=your_arch -O2". I was compiled my entire system with those flags and my applications no matter which have a very good functionality...
I hope give you some help to make your decision... On 4/9/07, Alexander Skwar <[EMAIL PROTECTED]> wrote:
· maxim wexler <[EMAIL PROTECTED]>: > One suggests using -O3 -pipe, the other, -O2 without > the pipe. The resulting binaries of a -O2 -pipe compile will be the same as those of a -O2 (no pipe) compile. See http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Overall-Options.html#index-pipe-81 > How much difference does this make? Is the extra level > of optimization with pipe the equivalent of the lower > level without? There's no extra level of optimization. So the question boils down to: Is -O3 better than -O2? Answer: Depends. On a system with not that much cache, it might not be. Alexander Skwar -- BOFH Excuse #16: somebody was calculating pi on the server -- gentoo-user@gentoo.org mailing list
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