Installing multiple versions - How on Mac and Windows ?

[igor]

On a Unix/Linux box, QTDIR drives everything. Change it and you can change which Qt version you are pointing to/using.

I want to do that on both a Mac and a Windows-XP machine.
I want to have a my stable 4.3.x Qt and I want to experiment with the 4.4 preview, but I do not have the luxury of having separate machines to install on.

How, please ?

[jacek]

Not quite, Qt 4 doesn't care about QTDIR. qmake has the Qt location hardcoded, so it's only a matter of using correct qmake executable.

[igor]

Not quite, Qt 4 doesn't care about QTDIR. qmake has the Qt location hardcoded, so it's only a matter of using correct qmake executable.

OK, I think I have a clue.
If I configure like this:

./configure ... -prefix $QTDIR -prefix-install ...

./configure ... -prefix $QTDIR -prefix-install ...

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Then it should put qmake in $QTDIR/bin which would work with using $QTDIR/bin and $QTDIR/lib in my environment settings.

Does that sound like it would work ?

[bender86]

In windows, I usually unzip qt-4.x.y source in C:\Qt\4.x.y, and compile it. Then set QTDIR to C:\Qt\4.x.y. PATH env variable contains %QTDIR%\bin. In this way, all is handled by QTDIR.

[igor]

I think I have it.
Since Qt4 "ignores" QTDIR, rather than setting QTDIR, I set up a (link/alias/shortcut) to each version of qmake I want to use.

Other fora have said that all the include and library paths are "hard-coded" into qmake, so this looks like it will do what I want.

I will post results of this effort, good or bad, after I have a chance to mess with it.

[jacek]

Since Qt4 "ignores" QTDIR, rather than setting QTDIR, I set up a (link/alias/shortcut) to each version of qmake I want to use.

Yes, that should work.