On Fri, Aug 14, 2009 at 5:43 PM, Nikos Chantziaras<[email protected]> wrote: > On 08/15/2009 03:33 AM, [email protected] wrote: >> >> [...] >> This being 4.3.4 to 4.1.1 looks like a major version change according >> to the upgrade guide. It doesn't mention what a switch manual takes, >> but it does list a whole series of steps such as remerging system and >> world without saying exactly when they or how much are necessary. I'd >> just as soon not do that unless necessary, but I'd much more regret >> not doing it if I should have. > > Switching the compiler with gcc-config is enough with this update. There are > no ABI changes and packages built with GCC 4.3 will happily work together > with the ones build with 4.4. > > I am doing an emerge -e system and emerge -e world anyway though since I > want to take advantage of the faster code 4.4 produces in general, but also > more specific whether or not the new "graphite" optimizer of GCC 4.4 (needs > "graphite" USE flag enabled for gcc) will give additional performance gain. > > (If anyone is interested in that, you need to first add: > > -floop-interchange -floop-strip-mine -floop-block > > to CFLAGS/CXXFLAGS (the options enabling the Graphite optimizer) and then > "emerge -e" system and world.) >
Are there any Gentoo upgrade instructions for these flags or did you figure this out from other sources? If I was going to switch to 4.4 seems like I'd want to get as much performance as I could safely get. I'm assuming that the list above is possibly not the complete list you might have in make.conf??? Thanks, Mark
