Migrate to qt5 before December 2015

[scpeters]

From announcement of qt 4.8.7:

"Qt 4.8.7 is planned to be the last patch release of the Qt 4 series. Standard support is available until December 2015, after which extended support will be available. We recommend all active projects to migrate to Qt 5, as new operating systems and compilers with Qt 4.8 will not be supported."

[scpeters]

We need to do the same for gazebo. We will post updates on our progress.

[dirk-thomas]

The problem is that qt_gui_core is working with both PyQt as well as PySide but PySide is not available for Qt5 atm.

[scpeters]

Hm... looks like http://www.pyside.org is down right now

[esteve]

PySide moved to the http://qt.io website:

https://wiki.qt.io/Category:LanguageBindings::PySide

Here's the roadmap, but I don't know how much of PySide has been ported to Qt5:

https://wiki.qt.io/PySide_Roadmap

[scpeters]

Looks like the last commit was 11 months ago

[dirk-thomas]

There is hope: pyside/pyside-setup@e7f0215

[dirk-thomas]

There is currently a lot of activity in the PSide repos with the suffix 2 (https://github.com/PySide) which is very promising.

[ShawnSchaerer]

Is anybody actively working on this? If not I will.

[dirk-thomas]

No, currently nobody works on this. If you want to look into it the order would be:

• https://github.com/ros-visualization/python_qt_binding
• this repo
• https://github.com/ros-visualization/rqt
• and then the various plugins

The most problematic part will likely be the PySide bindings.

[ShawnSchaerer]

I will start to look at it

[ahundt]

Any luck with this? I'm using code that depends on qt5 and I'm on a new project that uses ROS so the dependency conflict is an issue for me.

[ShawnSchaerer]

I have not looked in depth at it. it will be a while. Been focusing on
the URDF v2 / new robot format at the moment :)

On Wed, Dec 30, 2015 at 4:20 PM, Andrew Hundt notifications@github.com
wrote:

Any luck with this? I'm using code that depends on qt5 and I'm on a new
project that uses ROS so the dependency conflict is an issue for me.

—
Reply to this email directly or view it on GitHub
#56 (comment)
.

[ahundt]

Ok thanks, the information is helpful so I can plan accordingly!

[dirk-thomas]

@ahundt What is the conflict you are facing? Afaik Qt 4 and 5 is side-by-side installable so it should be possible to run two applications with different major versions of Qt at the same time.

[ahundt]

@dirk-thomas homebrew doesn't seem to encourage side-by-side installation, and I can't use other dependencies that need (or work better with) qt5 when this one is using qt4.

[scpeters]

Here's the source of the homebrew troubles:

• Add Qt 5 as an alternative to Qt 4 Homebrew/legacy-homebrew#16471 (comment)

Qt5 can still be installed in a separate prefix (keg-only), so as a workaround, it could still be usable if you add that prefix to the appropriate environment variables.

[ahundt]

Even if both are installed on one machine, am I correct in thinking a single application cannot link to both qt5 and qt4 safely?

[dirk-thomas]

Yes, I am pretty sure a single application can only use a single version.

[nicolaerosia]

Any updates on this? Will this go in Kinetic?
I see you've worked on this:
https://github.com/ros-visualization/qt_gui_core/tree/qt5
https://github.com/ros-visualization/python_qt_binding/tree/qt5
https://github.com/ros-visualization/rqt/tree/qt5
https://github.com/ros-visualization/rqt_common_plugins/tree/qt5

Have I missed a repo where's a qt5 branch?

[dirk-thomas]

Yes, the decision has been made that it will happen for Kinetic. See ros-infrastructure/rep#112.