ubuntu-phone team mailing list archive

[Benjamin Zeller <benjamin.zeller@xxxxxxxxxxxxx>]

On 03/03/2016 02:16 PM, Mathijs Veen wrote:
> There are some problems with qmlprojects when it comes
> to using different versions of Qt installed on the same machine.
>
> Im not sure how to read this.
There are different project types in the Ubuntu-SDK:
-> QmlProject, QMake and CMake

qmlproject types are the most troublesome and do not really support 
using it with other
Qt versions than the one QtC found in your PATH. However a qmake based 
template does not
have that problem.
Also the .qmlproject based templates will be deprecated soon and while
QtC will still build them we will not support creating new ones anymore.

> I did a clean install of the sdk yesterday on a clean 15.10 desktop. 
> Apart from the above mentioned segfaults that I also got at first, I 
> am not seeing QMLScene at all.
The segfaults are most likely because of a incorrect LD_LIBRARY_PATH 
that is not correctly set by the qmlproject type implementation in 
QtCreator. You can however
set it manually in the QtC run settings for your project.
> I think it is suposed to start in /usr/lib/x86_64-linux-gnu/qt5/bin 
> right? That dir does not exist on my system. I did however also get a 
> qt4 which does contain a bin directory. Is that what you mean is going 
> wrong?

There is a special Qt version installed in /usr/ubuntu-sdk-dev , in 
there you should have a qmlscene. The ubuntu-sdk-dev package however is 
a solution for
people who want to have a preview with the most recent UI toolkit. If 
you need more than that for your app you need to install 
ubuntu-sdk-libs-dev for now.

But that will not give you the most recent UITK we have on the phone. 
That one you only get with either the overlay ppa:

https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/stable-phone-overlay/+index?batch=75&direction=backwards&start=225

or by running the current "in development" Ubuntu. The overlay ppa 
however is only tested on the phones.

> Is a solution for this on the cards or are you saying we are supposed 
> to only run on a physical device using an armhf kit for qml projects? 
> Or is there a way to solve this myself?
Yes we are working on a solution to make it possible to easily run 
applications with the most recent released UITK. I hope we have good 
news soon about that.

The problem we face here is that people want to essentially run a app, 
that is meant for a totally different version of Ubuntu than the one 
they run as their host
for development. For example when the last LTS is your host you will 
lack all the new stuff that was added to the UI toolkit or other APIs 
since the phone is based
on Vivid + Overlay PPA.

So the ultimate goal is to have a Kit that brings all those runtime 
dependencies, where you can build and run in without tainting your host 
system. And thats exactly
what we are working on.

> Cheers,
>
> Mathijs
>
>
>
> On Thu, Mar 3, 2016 at 11:50 AM, Benjamin Zeller 
> <benjamin.zeller@xxxxxxxxxxxxx <mailto:benjamin.zeller@xxxxxxxxxxxxx>> 
> wrote:
>
>     Hello Filip,
>
>     could you give me a bit more informations about:
>
>     -> What Ubuntu version are you on?
>     -> What project type did you use?
>
>     As a shot in the dark: If you used qmlproject types, please
>     try again with a qmake type project.
>
>     There are some problems with qmlprojects when it comes
>     to using different versions of Qt installed on the same machine.
>
>     Benjamin
>
>
>
>     On 03/02/2016 11:04 PM, Filip Dorosz wrote:
>
>         Hi all.
>
>         I've been trying to start learning developing ubuntu touch
>         apps but
>         from the very beginning i run across problems.
>         First I was missing ubuntu-sdk-dev package as its not
>         mentioned in the
>         docs at developer.ubuntu.com <http://developer.ubuntu.com> and
>         was struggling with Segmentation fault
>         errors when trying to run examples from templates or from docs.
>         Now as its installed i don't get Segfaults but now...
>         When I create new project with framework ubuntu-sdk-15.04.4 it
>         gives
>         following error at "6 general alerts" (im not using English
>         version so
>         it may differ a little):
>
>                  "/usr/ubuntu-sdk-dev/bin/qmlplugindump" zakończył
>         pracę błędem.
>                  Argumenty: -nonrelocatable Ubuntu.UnityWebApps
>                  0.1 /usr/lib/x86_64-linux-gnu/qt5/qml
>                  This application failed to start because it could not
>         find or
>                  load the Qt platform plugin "minimal".
>                           Reinstalling the application may fix this
>         problem.
>                  And when trying to run any example from
>         developer.ubuntu.com <http://developer.ubuntu.com> it gives
>         the following error:
>
>                  /usr/ubuntu-sdk-dev/bin/qmlscene: symbol lookup
>                  error: /usr/ubuntu-sdk-dev/bin/qmlscene: undefined
>         symbol:
>                  _ZN7QString14toLower_helperERS_
>                  /usr/ubuntu-sdk-dev/bin/qmlscene zakończone kodem 127
>                  How can I resolve this issues?
>
>         With kind regards,
>         Filip Dorosz.
>
>
>
>
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