:: Mircea Luca writes: >> I guess that recompiling every package is not worth the >> trouble, but recompiling multimedia and CPU intensive ones may >> be a major gain (say, MPEG players and such).
> Yes,I was thinking more like X ,KDE ,Gnome and multimedia so I guess > the few things left won't take that much time.:-). Is it safe to recompile X with different flags? IIRC, X 3.3.6 shouldn't even be compiled with gcc 2.95.2 (the Makefile would look for gcc272), because 2.95 would miscompile it. (I could be wrong). >> BTW, you can use -O6 for your programs. If I remember >> correctly, it will fallback to whatever is the highest mode of >> optimization (somebody please correct me if I'm wrong -- I >> read this a long time ago and didn't find it listed in the >> current documentation now; the funny thing is that it's not >> mentioned in the current potato manpage). >> >> 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. I've made some tests here modifying pentium-builder. I think the prolem with changing it is that, if I call gcc -O2 -O3 That'll be the same as "gcc -O3" So it'll work if you set an env. variable to "O3" and override the -O2, but will not work the other way araound (you can't force it to use a lower optimization level than the one in the command line). That's because -O2 will just enable a set of optimizations, and -O3 will enable a superset of -O2. Unless the code was changed in order to strip the previous "-O" setting from the arguments (Joey, if you're reading this: is it nonsense?)... Anyway, the difference between -O2 and -O3 seems to be loop-unrolling; I'm not sure if it's worth recompiling everything with -O3... J. -- Jeronimo Pellegrini Institute of Computing - Unicamp - Brazil http://www.ic.unicamp.br/~jeronimo mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED]
