[gentoo-dev] Yet Another Multi-QT Scheme

[Dan Armak]

Hi all,

The current (latest) scheme for the qt /etc/env.d files has multi-qt support 
with regard to major qt versions (2,3,...) but not minor versions (2.2, 
2.3...). This is my proposition for adding this support.

What we want is a file in /etc/env.d for every minor version of qt. Revisions 
(2.3.X) don't need separate files since they are binary compatible and can be 
freely switched.

This is the file that adds /usr/lib/qt-x11-version/{bin,lib,man} to PATH, 
ROOTPATH, LDPATH and MANPATH respectively.

We also want the newer versions of qt to go into the various PATHs first, 
therefore they need the lower numbers, so as to be processed first.

Proposition 1:
qt-x.y.z 		(8-x)(9-y)qt-x11-x.y.z
That is:
qt-2.0		69
qt-2.2		67
qt-2.3		66
qt-3.0		50
qt-4		40

This makes it easy to calculate the number for each new file. However, it has 
a rather large spread. It might be better to simply assign consecutive 
numbers as the new versions come out, starting around e.g. 60:
qt-2.0		60
qt-2.1		59
qt-2.2		58
qt-2.3		57
qt-3.0		56
...
and so on. I don't mind either way.
Now that I've written both out, the first seems rather silly :-)

There is also the "versionless" ??qt file which sets QTDIR, it is currently 
numebered 30 and I see no reason to change that.

As always, please reply with objections to prevent me from doing this.

Note: since noone (but myself) has a non-2.x qt installed right now, these 
changes won't affect anything.

However, everyone will have to merge the latest revision of their 2.x qt and 
unmerge the old one before merging any version of qt3.x. Once things get 
settled - and I really think this'll be the final scheme - how do we make 
everyone upgrade?

-- 

Dan Armak
Gentoo Linux Developer, Desktop Team
Matan, Israel