On 5/28/05, Ryan Lynch <[EMAIL PROTECTED]> wrote: > Optimization level 9 (-O9)? Thats a laugh. Read the GCC man page, the > optimization levels are just groupings of other optimization flags (-O1, -O2, > -O3, -O0, -Os), with optimization level 3 (-O3) containing the most > optimization flags. The numbers don't correlate to any kind of optimization > level (i.e. -O99 wouldn't be "99%" optimized or some equivilent malarky). > The numbers might as well be letters like A, B, C.... In fact, if you know > anything about programming, most of the -O3 flags and beyond become very code > specific, and sometimes only work with programs written a certain way or run > on certain processors. This just goes towards my general opinion that > Gentoo users in general see gcc cflags as some kind of magic incantation and > no little about their purpose, potential, or meaning. -funroll-loops anyone?
Actually, there *was* such -O4 or -O6 on certain old gcc builds. I remember using gcc -O6 at some point in time, and it was a valid flag according to the man page. I think it might have been some dirty "enhancements" og the EGCS family... Julien -- gentoo-user@gentoo.org mailing list
