Thanks, Wang Xuerui and Bruce! That's exactly helpful.
I'm going to do some testing Real Soon. Rgds, -- On Wed, Aug 14, 2013 at 1:28 PM, Wang Xuerui <idontknw.w...@gmail.com>wrote: > 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? > > -- FdS Pandu E Poluan * ~ IT Optimizer ~** * • LOPSA Member #15248 • Blog : http://pepoluan.tumblr.com • Linked-In : http://id.linkedin.com/in/pepoluan
