I'm using -march=native -O3 -fomit-frame-pointer in my makepkg.conf on Arch Linux and I've had no problems in recent year. True I don't recompile everything (perhaps unlike many Gentoo users) but mostly packages that actually benefit from speed optimization. This includes compression, video codecs, emulators... Also I often use other flags like PGO (-fprofile-generate, -fprofile-use), -ffast-math on stuff I recompile and it's been rock solid. Also I'm going to try out the new link time optimizations in the current gcc 4.5 snapshots soon, although they are likely to break certain things since they are still in development.
Are there any specific packages or threads that you can point to that fails to build correctly with -O3 using gcc 4.x?
Are there any specific packages or threads that you can point to that fails to build correctly with -O3 using gcc 4.x?
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