QT toolset changes

From: Vladimir Prus (ghost_at_[hidden])
Date: 2003-05-26 09:50:25

I've just comitted a revised version of QT toolset, and would like to ask for 
comments from both users and developers.

For users, almost nothing changed. Except that now, instead of

<using>qt

one should write

<library>@/qt/qt

That's a bit more verbose, but the previous approach was a bit dirty. 
Moreover, with the second approach it would be possible, without much 
problems, to support several versions of QT at the same time. Is the new UI 
OK.

For developers, two things changed.

First, the 'qt' module now declares itself as 'stanalone' project and declared 
prebuilt target to single-threaded and multi-threaded QT. 

Second, we need to make sure that when qt is used, the relevant additional 
generators are run. For that, I've introduced new feature "allow", to control 
which generators can be run. The qt targets have "<allow>qt" as usage 
requirements, so whenever the target is used, the qt-specific generators can 
run --- since they have "<allow>qt" as requirement. 

I wonder what's opinion on those two points? Actually, the 'standalone' 
projects are underdocumented now, but the usage in qt.jam should be obvious.

- Volodya