Qt 5 Fedora 21 packages

[Rex Dieter]

There are several strategies:

* The <bin>-qt5 convention is already used by most distributions, so many 
applications/tools have adapted to it already.  If you're aware of any that 
haven't yet, I'd be happy to help produce upstreamable patches to implement 
such support.

* qt5-qtbase-devel provides rpm macros (in /usr/lib/rpm/macros.d/macros.qt5) 
that are useful during package creation, including:
%_qt5_qmake
%_qt5_bindir
As you noted, one way to ensure Qt5 gets used is to prepend %_qt5_bindir to 
$PATH.  This is essentially what kf5's %_cmake_kf5 (and similarly 
%_cmake_kde4) macros do.

* As far as 'moc', that's not *usually* a tool an end-user typically runs, 
so we've never seen a need to provide easy access (via pkg-config, or rpm 
macro).  If you have a justifiable use-case, we can certainly add it.

* there's a developer tool 'qtchooser' that allows users to switch between 
default Qt developer environments.  For the Qt5 qmake case,
$ qtchooser -qt=qt5 -run-tool=qmake
qtchooser is a little controversial (not universally endorsed by the kde-
sig), so currently it is not recommended to rely on it in any fedora package 
builds.

-- Rex


Michael Schwendt wrote:

> Some confusion here trying to use Fedora's Qt 5 packages, and it seems
> they cannot be use quickly.
> 
>   $ rpm -qa qt5\*|sort
>   qt5-qtbase-5.3.2-3.fc21.x86_64
>   qt5-qtbase-devel-5.3.2-3.fc21.x86_64
>   qt5-qtbase-gui-5.3.2-3.fc21.x86_64
>   qt5-qtbase-ibase-5.3.2-3.fc21.x86_64
>   qt5-qtbase-mysql-5.3.2-3.fc21.x86_64
>   qt5-qtbase-odbc-5.3.2-3.fc21.x86_64
>   qt5-qtbase-postgresql-5.3.2-3.fc21.x86_64
>   qt5-qtbase-tds-5.3.2-3.fc21.x86_64
> 
> No "moc" in PATH, no "uic" either. Just moc-qt5 and uic-qt5.
> 
>   $ pkg-config --variable=moc Qt5
>   /usr/lib64/qt5/bin/moc
>   $ pkg-config --variable=uic Qt5
> 
>   $
>   $ rpm -qf  /usr/lib64/qt5/bin/moc
>   qt5-qtbase-devel-5.3.2-3.fc21.x86_64
> 
> No documentation in that package:
> 
>   $ rpm -qd qt5-qtbase-devel
>   $
> 
> It seems to be specific to Fedora. Looking up the qt5-qtbase spec file,
> even the Qt5.pc file is generated there. The "moc" variable is added there
> to help finding MOC, but why not also UIC? All binaries get renamed to
> avoid a conflict, but I couldn't find a helper script to make them
> available in path again. I think of a shell file in a fixed location one
> could source. And why isn't any of this documented in the package
> description?
> 
> It looks like one could simply prepend
> 
>   /usr/lib64/qt5/bin
> 
> to $PATH to make available the executables, which are renamed to avoid
> conflicts with other Qt versions.
> 
>   $ rpm -qi qt5-qtbase-devel|tail -2
>   Description :
>   Development files for qt5-qtbase.