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Yeah, i read all the relevant FAQ and other files during class today instead of doing work.
For the lazy people, the files mentioned were Binutils, gcc and glibc.
They said that setting optimization flags for these could either make them
not compile correctly or cause problems that would make other programs,
who are dependent of the afor mentioned, break.
PS: Thank you for the chapter part, the faq nor book doesn't tell you when
you should start using them if you wanted to.
You could use the flags in chapter 5 too (excepts where mentioned not to), that's probably why they only mention flag settings if it is 'not advised'.
But what's the point of optimizing in chap. 5, it's a temporary environment.
my thoughts exactly! anyone know a good resource that explains the optimization flags in a non-technical way? i.e. what is and isn't worth using and why, rather than what the flags actually do? cos to be honest what the flags actually do doesn't mean as much as what the results are! Of course i like to know what they do but only broadly - i'm never going to actually understand the COMPLETE picture!
For what it's worth, my experience with optimisation is that it isn't worth the risk. Some things (xine-libs, mplayer) won't compile at all if you try to optimise them.
The benefit is that some apps may run faster but generally the difference is so slight that you can't see a difference. The risk is it makes apps crashy. I don't like crashy apps. It reminds me of Mandrake...I would recommend caution.
my experiences are that optimizations are really something lfs user should go for. At least -march option with -O2 is worth trying. O2 implies IMHO all relevant options and setting other doesn't change much. On my box I've all programs (including gcc/glibc, etc.) compiled with -march=athlon-tbird and I've never had stability problem. But (as I've read somewhere), fact that it works for me doesn't mean it will work for you.