QtLocation map updates

[Dirk Hohndel]

> On Aug 3, 2017, at 6:54 AM, Dirk Hohndel <dirk at hohndel.org> wrote:
> 
> 
>> On Aug 3, 2017, at 4:36 AM, Jan Mulder <jlmulder at xs4all.nl> wrote:
>>>>> Suspicious line in the console:
>>>>> 
>>>>> qrc:/MapWidget.qml:41: Error: Cannot assign [undefined] to
>>>>> QDeclarativeGeoMapType*
>>>>> 
>>>> 
>>>> the map plugin is not being found.
> 
> We need a better error message for that case :-)
> 
>>> Yes, that is what I think as well. Already scrutinized the build and install process, but nothing found yet. Stopping with the debugger also shows that the plugin is not reached.
>> 
>> Yes, this is confirmed. I just copied the compiled plugin to my user Qt tree (which has the esri plugin as well), and then the Google map is created correctly, and no endless loop.
>> 
>> So an install problem ... not sure how to fix it, however.
> 
> I think the way the build/install for the plugin works right now it will install into the Qt install location.
> Which works great if you are (like me) have compiled Qt from sources everywhere, but doesn't work so well if you are doing this on a regular system install.
> 
> I'll try to fix that.

I'm running out of time. It would be nice if someone could create cmake magic similar to what we were doing with the marbledata to allow us to bundle the plugin with Subsurface.
This should be working on Mac and Windows already, what's missing is all the different flavors of Linux.

/D