On Tue, May 29, 2012 at 11:09 PM, Alan McKinnon <alan.mckin...@gmail.com> wrote: > On Tue, 29 May 2012 22:56:07 +0200 > Rafa Griman <rafagri...@gmail.com> wrote: > >> Hi Vaeth :) >> >> On Tue, May 29, 2012 at 7:02 PM, Vaeth >> <va...@mathematik.uni-wuerzburg.de> wrote: >> > On Tue, 29 May 2012, Rafa Griman wrote: >> >> >> >> gawk: cmd. line:3: error: Unmatched [ or [^: /[^[:space:]]/ >> > >> > >> > Your gawk is broken. This happens if you emerged gawk with >> > current gcc and aggressive FLAGS like -DNDEBUG or -flto. >> > Not sure whether it is a bug of gawk or gcc. >> >> >> So it seems to be the CFLAGS :( As I said in my previous e-mail, I was >> "experimenting" a bit with them ... I'll be more conservative ;) > > Well, on the one hand the flags don;t seem to be too bad overall, but > on the other hand there's the golden rule of Gentoo: > > Don't stuff around with CFLAGS > > Why not? Well, there's the ricer phenomenon where changed CFLAGS > worsen performance and stability but the user's own bias convinces > him/her that it's actually vastly improved.
I know that rule and tried not to be too agressive but seems I was O:) Since it's not my min machine, I was going to experiment (nothing "scientific", just curiosity) trying different options on different partitions and see how they work out. > Some tweaks are perfectly OK, like the multimedia and cpu-specific > stuff (sse, mmx and all their related cousins). These are normally safe > and can give huge gains with video playback. Likewise for the GPU tweaks > once those hit mainline usage. That was mainly the reason: video playback and some other apps (scientific). But nothing serious. > One last tweak, if the code is built on the machine that will run it > (the usual case, replace -march and -mtune with just "-march=native". > It has exactly the same effect but is easier to read, is > self-documenting and allows the compiler to attempt it's best (the > compiler usually does know much better what to do than you do) I totally agree with you: the compiler knos better ;) TIA Rafa
