Some tips for Gentoo

Несколько полезных моментов

1. -fomit-frame-pointer Glibc has a glibc-omitfp USE flag. This makes glibc use -fomit-frame-pointer and some other optimizations for the build where it's safe.)
2. If you are using gcc-4.2.2 or newer you can also use -march=native or -mtune=native.
3. 64 bit profile (amd64):

CHOST="x86_64-pc-linux-gnu"
CFLAGS="-march=native -mtune=native -O2 -pipe"
CXXFLAGS="${CFLAGS}"