Alejandro Exojo wrote:> El Mi�rcoles, 11 de Marzo de 2009, David escribi�:>> Maybe I am wrong, but it is the safest way, and it costs only a couple of>> hours, so it's worth try it to avoid possible problems :)> > And do you recompile everything in your system each time you upgrade GCC
If you run gentoo, you *should* recompile after a major gcc upgrade (on the theory that you'll get better, faster code by doing so) :-).
> or libc?
Again, on gentoo I would consider it :-). And I bet you'd be surprised the extent to which most distros usually have software built against the latest glibc.
Another reason I rebuild is it's a good excuse to nuke the install tree and make sure there's no cruft floating around. That's usually not an issue when you're dealing with distro packages, but it *is* (or at least, can be) when you're overwriting an install on a regular basis with no clean-up happening in between. And while CMake is far better than most build systems about always rebuilding anything that needs to rebuild, like any software there is a possibility of bugs, both in CMake and in KDE's build system.
Also, there is a very good reason why you *should* rebuild; to take advantage of new features, and to allow compatibility code to die. I know KDE picks up the occasional #ifdef based on Qt version. In some cases, rebuilding will improve things, enable new features, etc. In some (less common) cases, things may be *genuinely broken* if the 4.4 code is used with 4.5.
Finally, all the header changes mean that the next "incremental" build will likely be nothing of the sort, regardless, so there's something to be said for "getting it over with". (On an unrelated note, I feel sorry for the non-native-en_US people that will be trying to parse that expression; I was born en_US and *I'm* having trouble :-).)
All that said... there's an excellent chance that nothing bad will happen if you don't rebuild. I just don't think you should be insulting people that *do* run full rebuilds on major Qt updates. (Or else, you should choose your words more carefully so you don't seem to be doing so ;-).)
-- MatthewPlease do not quote my e-mail address unobfuscated in message bodies.-- Sendmail administration is not black magic. There are legitimate technical reasons why it requires the sacrifice of a live chicken. -- Unknown(It seemed appropriate...)
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