On Thu, Oct 24, 2013 at 09:58:17PM +1100, Adam Carter wrote > I figured that just -march=amdfam10 was a good start, since it implies > MMX, SSE, SSE2, SSE3, SSE4A, 3DNow!, enhanced 3DNow! and ABM, but i > may add the rest of my make.conf CFLAGs since I dont have any issues > with any other software on this system. Is that fair reasoning?
Two points... 1) Are you cross-compiling, or building on the system that'll be running the kernel? If the build machine will be running the kernel, use "-march=native". It detects what cpu you're running on and builds accordingly. 2) Use the flags "-fno-unwind-tables -fno-asynchronous-unwind-tables" to eliminate .eh_frame bloat. See the mailing list archive at http://comments.gmane.org/gmane.linux.busybox/36695 for the gory details. The guys at busybox are anal about code bloat; this is an important issue for them. 3) Unless you're debugging, you can get additional size reduction with the "-fomit-frame-pointer" flag. My make.conf has the following CFLAGS line... CFLAGS="-O2 -march=native -fomit-frame-pointer -pipe -fno-unwind-tables -fno-asynchronous-unwind-tables" -- Walter Dnes <[email protected]> I don't run "desktop environments"; I run useful applications
