[Qt-jambi-interest] Using the system qt4 libs

[Erwin Mueller]

On Tuesday 04 August 2009 18:59:58 Eskil Abrahamsen Blomfeldt wrote:
> Erwin Mueller wrote:
> > Thank you. So I could use LD_LIBRARY_PATH to point to /usr/lib64 or
> > /usr/lib and if there are no compatible libraries are found then the one
> > in the jar archive are used?
> >
> > Just tested it on my system and it appears to work. I put two libraries
> > paths, one is /usr/lib64 and the other one is $JAMBI/lib. The first one
> > will be searched first and then the latter.
>
> No, we can't detect whether the system library is compatible, so you
> will have to make sure of this on your own. You need to *manually build*
> Qt Jambi from a source package against the Qt version which is installed
> on the system to which you are deploying. This is how binary deployment
> on Linux is typically done. If you deploy the Qt Jambi binary package
> against the system libraries, you are probably going to see crashes and
> memory corruptions down the line if not right away, because the
> configuration flags used when building the Qt Jambi binary package is
> incompatible with the configuration flags used when building KDE.
>
> If you do this, you *should not* use Qt Jambi's method of deploying
> libraries in .jar-files. Only use the .jar-file deployment if you are
> bundling every library you need in the .jar-file. The LD_LIBRARY_PATH
> deployment is Java's default way of resolving libraries, and is *an
> alternative* to using Qt Jambi's custom .jar-file deployment.
>
> -- Eskil

So, I just had luck that my system libraries are working with the pre-compiled 
Qt Jambi?

How should I then deploy the finished application on the end user system? 
Should I compile Qt Jambi with all possible Qt-styles (Oxygen, Phase, Plastic, 
Cleanlooks, etc) and deploy it the Qt Jambi way? I can't ask the user to 
compile Qt Jambi against his Qt4 system libraries, can I?

I don't know, but normally the required libraries are installed as a deb or 
rpm package and the application can use them (of course on Windows you just 
give the user all necessary libraries to install under C:/Programs/Your App/). 
But I think there are none Qt Jambi packages right now. At least there are 
none for Debian.

If I ask the user to compile Qt Jambi against his Qt4 system libraries, then 
the user need first to install all necessary -dev packages?

Thank you, Erwin.