add libqwt-qt5-dev for ubuntu xenial

[samuelba]

Rqt in Kinetic is based on QT5, this means rqt plugins using QWT must use the QT5 version of libqwt which is libqwt-qt5. Otherwise, a Segmentation fault (core dumped) occurs at the start of the rqt plugin.

gdb output:

Thread 1 "python" received signal SIGSEGV, Segmentation fault.
0x00007fffadb565a4 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4

[tfoote]

For Kinetic support please add rules for wily and jessie as well.

connected to #11488

[dirk-thomas]

As far as I know there are no Python Qwt 6.1 packages available. So this won't make the plugins work.

[samuelba]

at least C++ rqt plugins using qwt (like our rqt_multiplot) work with libqwt-qt5. I don't know about python rqt plugins. @dirk-thomas there is a python qwt implementation working with PyQt5 -> PythonQwt, however, I didn't test it.

[dirk-thomas]

I was referring to an Ubuntu package which we could depend on. +1 foradding the C++ only entry (with the comments from @tfoote).

[samuelba]

I added the qt5 rule for wily and the qt4 rules for utopic and vivid. However, the libqwt-qt5-dev doesn't exist on jessie, there seems to be a package for stretch but not for jessie.

[dirk-thomas]

I already gave my +1 above. This is pending a second review from the @ros/ros_team.

[tfoote]

For jessie then we should put in the older version https://packages.debian.org/jessie/libqwt-dev matching the older ubuntu distros.

[jacquelinekay]

Wouldn't that mean that qt plugins on Jessie that use libqwt will segfault?

[tfoote]

Yeah, I guess we could either create a separate rule for qt5 vs qt4 qwt or just leave it off for now. Or consider a backport into our repos. Otherwise we'll need to blacklist anything using this for debian.

[jacquelinekay]

I'm ambivalent about Jessie since it's not one of our "core" platforms; I'll leave it up to Tully to decide what to do about that. +1 from me to add libqwt-qt5 to Xenial.

[tfoote]

Ok, we'll go w/o the rule for now. Any package that depends on this will need to be blacklisted for debian jessie. If there's demand we can consider trying to generate a backport.