On Friday 14 November 2014 16:52:09 René J.V. Bertin wrote:
> Hi,
>
> My main work environment is under OS X, based on MacPorts. It is currently
> not possible with that framework to have Qt4 and Qt5 installed in parallel;
> it's one or the other, installed into ${prefix} (usually /opt/local).
>
> I don't know why the Qt4/5 port maintainer didn't set things up from the
> get-go to allow parallel installations, so I'd like to make a start with
> enabling that, at least for Qt4 and probably "simply" using qtchooser as is
> also done under Linux.
In framework builds of OS X, Qt 4 and Qt 5 are not co-installable, since they
claim the same names like QtCore.framework. We decided early on in the Qt 5.0
cycle that we wouldn't fix this, as most of OS X development had moved on to
having separate project roots for everything and applications bundled the
frameworks they needed.
Therefore, you need to install them in separate prefixes.
> I haven't found a lot of information about qtchooser, so I'm hoping I can
> get some advice on here on how best to proceed. If in anyway possible, I'd
> like to do this in a way that doesn't force me to rebuild all my Qt4 (and
> KDE4) applications at once. I suppose that would oblige me to put symlinks
> from the current shared libraries' install locations in ${prefix} to
> wherever I decide to put the new version - can that be automated? I also
> presume that one cannot have that kind of symlinks for both Qt4 and Qt5, or
> can the library files actually live together in the same directory
> (regardless of whether they're frameworks or ".dylibs")?
qtchooser will help you. Your $PATH should contain only qtchooser, like so:
$ ls -l =qmake =moc =designer
lrwxrwxrwx 1 thiago users 9 Mai 1 2014 /home/thiago/bin/designer ->
qtchooser
lrwxrwxrwx 1 thiago users 9 Mai 1 2014 /home/thiago/bin/moc -> qtchooser
lrwxrwxrwx 1 thiago users 9 Mai 1 2014 /home/thiago/bin/qmake -> qtchooser
But it does not help for the libraries. It will only help the executables.
Then qmake takes over and uses the right paths to the libraries when linking.
--
Thiago Macieira - thiago.macieira (AT) intel.com
Software Architect - Intel Open Source Technology Center
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