[Interest] Qt undefined reference to `LED::LED(QWidget*)' LED in a custom widget

[Robert Wood]

OK, I found this which touches on what I'm trying to do:

https://forum.qt.io/topic/30884/can-t-use-custom-widget-error-undefined-reference-to-custom-widget/2

Which says you have to have this kind of thing:

LIBS += -Llibled-designer-plugin

And I thought, bingo! I don't have that.

However, that makes no odds.

Later on in the thread SGaist ask if he has a library both for the 
widget and for the Designer plugin. I on;y have a 
libled-designer-plugin.so file, I don't have any other library.

Someone further up is asking whether has a dll and a lib file. I 
obviously need the .so, not a dll with it being Linux, but I don't have 
a .lib file either.

I'm guessing I am missing another file, but have no idea where it would 
be or how to generate it (if that is what is necessary).

I'm rally floundering here as I'm really just an embedded C/hardware 
designer!

Would really appreciate someone pointing out what salient information 
I'm missing!

Thanks!


On 10/03/16 18:15, Robert Wood wrote:
> Hi folks,
>
>
> I have downloaded this project:
>
> http://www.ics.com/blog/integrating-custom-widget-qt-designer
>
> And installed it by running qmake, make, make install (the latter as
> root) in the directory the source code was copied to.
>
> This then put the custom widget in Qt Designer and allowed me to place
> the widget on a form. So far, so good. It complained about not having
> the right header file I so copied cutescreenwidget.h to /usr/local/include/
>
> That took away one error. However, I then got:
>
> ~/Software/Qt5/WidgetTesting/build-led_inc_test-Desktop_9516b5-Debug/ui_mainwindow.h:42:
> error: undefined reference to `LED::LED(QWidget*)'
>
> I tried copying libled-designer-plugin.so to /usr/lib64. It didn't help.
>
> If I try copying the LED widget source code to my directory and place
> the LEDs in Qt Creator it works. So, there must be, I guess, something I
> haven't done properly when installing the custom widget?
>
> Many thanks,
>
> Rob
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