Project ERROR: Unknown module(s) in QT: designer

Hiloshi

I installed QT Creator into the ubuntu 16.04,

After first compiler by linux-g++, libqwt_designer_plugin.so was created.
and then I open terminal and run "sudo make install" in /build-qwt-Desktop_Qt_5_8_0_GCC_64bit-Debug/. Then I can see qwt-6.1.3 folder was generated to /usr/local

then as @SGaist said, I comment out qwtdesigner, then run 2nd compiler.
2nd compiler is linux-rasp-pi-g++, then generate ../build-qwt-Raspberry_Pi-Debug.

Where should I copy libqwt_designer_plugin.so to ??
I expect after this process, I should able to see qwt widget in designer, right ?
I had tried copy to ~/Qt5.8.0/5.8/gcc_64/plugins/designer , but not working.
Should I do sudo make install in the ../build-qwt-Raspberry_Pi-Debug after 2nd compiler ?
After 2nd compiler, I think I should copy all ../build-qwt-Raspberry_Pi-Debug/lib to some place, but where ?? Replace everything in the /usr/local/qwt-6.1.3/lib ??

Appreciate for any help~

SGaist

The plugin should go within the installation of Qt Creator

You should have your cross-compiled Qwt in it's own folder.

Hiloshi

Dear Sirs,

I want to make qwt widget show on designer first, so I copy libqwt_designer_plugin.so to below foler, one by one.

/Qt5.8.0/5.8/gcc_64/plugins/designer
/Qt5.8.0/Tools/QtCreator/lib/qtcreator/plugins
/Qt5.8.0/Tools/QtCreator/lib/Qt/plugins/designer
/Qt5.8.0/Tools/QtCreator/lib/qtcreator/plugins/qbs/plugins
/Qt5.8.0/Tools/QtCreator/bin/designer <--manual create bin/designer folder
/usr/local/qwt-6.1.3/plugins/designer <--manual create plugins/designer folder

Unfortunately, none of them work... Any idea ?

PS. I re-open Qt Creator after copy to the folder each time.

SGaist

Did you check that you are using the same version of Qt that was used to build Qt Creator ?

Hiloshi

Dear @SGaist ,

I think they are the same, when I install qt creator I just download *.run file to complete the installation, so I think it use default make to build qt creator. Default gcc version is:
x86_64-linux-gnu

When compiler qwt desktop(ubuntu) version, I didn't export different compiler. So Qwt and qt creator should use the same make and gcc version.

Is there any point I can check ?

SGaist

You can start Qt Creator on the command line after setting the QT_DEBUG_PLUGINS environment variable to 1 so you can see what is happening with your plugin.

Hiloshi

Dear @SGaist ,

I reinstall QT Creator and copy libqwt_designer_plugin.so to
~/Qt5.8.0/Tools/QtCreator/lib/Qt/plugins/designer/, then I can see qwt widget in the designer.

I have not complete the whole process, but this is a good start. Thanks.

SGaist

What do you mean by "all process" ?

Hiloshi

Dear @SGaist ,

I can run on Ubuntu. Then I rebuild by Raspberry and did:

sudo make install

then copy lib to

~/Qt5.8.0/Tools/QtCreator/lib/Qt/lib/ 
~/Qt5.8.0/5.8/gcc_64/lib/

then build Qwt example OK, but when I run it, it show:

error while loading shared libraries: libqwt.so.6

So I think I didn't complete all process~

Hiloshi

Dear All,

After surf the Internet, it can be solved easily by
https://stackoverflow.com/questions/5375523/how-to-set-qwt-path-or-environment-variable?rq=1

Just copy *.so to RPi then add path to /etc/ld.so.conf

Thanks everyone.