Jeronimo Pellegrini <[EMAIL PROTECTED]> writes: > >> I also don't know if -O6 does the same thing as -O9. > >> > >> []s, Roger... > > > I've read something on a archive of a gcc mailing list but apparently it > > doesn't relate to the gcc we use-don't remember the link ,I > > researched this for a few hours.I got stuck at the debian/rules when > > I decided to ask for help. > > Yes... I saw a few Makefiles using -O9 and -O10.
You should never blindly use high optimization levels. For one, there is nothing wired above -O3, so -O9 and -O10 both fall back to -O3, IIRC. For another, -O2 is considered for many applications the maximum safe optimization level, so recompiling all of your packages with -O3 might not be the best idea. (I know I've had programs I've written die on -O3 that work on -O2). -O2 is considered to be the "production code where you don't care about length of compile time" option. -- Zachary M. Loafman
