2013/8/14 Helmut Jarausch <jarau...@igpm.rwth-aachen.de>: > Why not compute it yourself? > > Do cat /proc/cpuinfo on all machines and compute the intersection of all > "flags" > Then enter something like the following into /etc/portage/make.conf > > CFLAGS="-O3 -pipe -msse -msse2 -msse3 -msse4a -m3dnow"
Or even better, directly intersect the GCC flags which can be obtained in this way: echo | gcc -O2 -pipe -march=native -E -v - 2>&1 | grep cc1 Also, according to the Gentoo Handbook going -O3 for the entire system may cause instability and other problems. Has the situation changed over the years?
