I can't link the libusb library and change UI

[Andrew23]

@jsulm said in I can't link the libusb library and change UI:

@Andrew23 said in I can't link the libusb library and change UI:

The only thing that I changed after that was the build directory and nothing else

Where is the build directory? Is it inside project directory?

No, it's outside. The project's directory is .../QtProjects/MyProject and the build directory is .../QtProjects/build-MyProject-Desktop_Qt_5_15_2_MinGW_64_bit-Debug.

[aha_1980]

@Andrew23 Make sure you don't have stall Makefile or generated ui_xxx.h files anywhere in your source or build folder.

You problems sounds to 99% like that.

[Andrew23]

@aha_1980 said in I can't link the libusb library and change UI:

@Andrew23 Make sure you don't have stall Makefile or generated ui_xxx.h files anywhere in your source or build folder.

You problems sounds to 99% like that.

In my source folder ( .../QtProjects/MyProject ) I haven't any Makefile or ui_xxx.h, just my c++ and ui source files. But in the build folder ( .../QtProjects/build-MyProject-Desktop_Qt_5_15_2_MinGW_64_bit-Debug ) I have these files

[jsulm]

This post is deleted!

[jsulm]

@Andrew23 Is this the same build folder you used before you copied the project?

[Andrew23]

@jsulm said in I can't link the libusb library and change UI:

@Andrew23 Is this the same build folder you used before you copied the project?

The original project's folders are

.../QtProjects/Test/MyOriginalProject
.../QtProjects/Test/build-MyOriginalProject-Desktop_Qt_5_15_2_MinGW_64_bit-Debug

now my copied project folders are

.../QtProjects/MyProject/MyNewQtProject
.../QtProjects/MyProject/build-MyNewQtProject-Desktop_Qt_5_15_2_MinGW_64_bit-Debug

When I created the original project the framework choose the build forlder by default. When I copied the project in the new folder I inherited that and I changed it.

[aha_1980]

@Andrew23

Close Qt Creator, delete the .pro.user file and the build folder, then open the project again and rebuild it.

[J.Hilk]

@Andrew23 also delete the .qmake.stash file

[Andrew23]

@aha_1980 said in I can't link the libusb library and change UI:

@Andrew23

Close Qt Creator, delete the .pro.user file and the build folder, then open the project again and rebuild it.

@J-Hilk said in I can't link the libusb library and change UI:

@Andrew23 also delete the .qmake.stash file

Thanks guys. I deleted the build folder (where is .qmake.stash) and the .pro.user file in the source directory, and now I can modify my User Interface. But the other strange behaviour about the libusb library remains: if I modify my code I get the error

warning: ignoring #pragma warning  [-Wunknown-pragmas]
warning: ignoring #pragma warning  [-Wunknown-pragmas]
warning: ignoring #pragma warning  [-Wunknown-pragmas]
error: skipping incompatible D:\Documenti\Qt\ProgettoAudiometro\Evometer/libusb-1.0.lib when searching for -llibusb-1.0

but if I rebuild again the project, it works without errors. So I get the error only the first build after a change. Now, I can live with it, but how I can fix it?

[aha_1980]

@Andrew23 said in I can't link the libusb library and change UI:
Hi @Andrew23,

I think:

warning: ignoring #pragma warning [-Wunknown-pragmas]
warning: ignoring #pragma warning [-Wunknown-pragmas]
warning: ignoring #pragma warning [-Wunknown-pragmas]

and

error: skipping incompatible D:\Documenti\Qt\ProgettoAudiometro\Evometer/libusb-1.0.lib when searching for -llibusb-1.0

are two different warnings.

Have you made sure that the libusb at the mentioned path has a compatible architecture (32 or 64 bit)?

Regards

[Andrew23]

@aha_1980 said in I can't link the libusb library and change UI:

@Andrew23 said in I can't link the libusb library and change UI:
Hi @Andrew23,

I think:

warning: ignoring #pragma warning [-Wunknown-pragmas]
warning: ignoring #pragma warning [-Wunknown-pragmas]
warning: ignoring #pragma warning [-Wunknown-pragmas]

and

error: skipping incompatible D:\Documenti\Qt\ProgettoAudiometro\Evometer/libusb-1.0.lib when searching for -llibusb-1.0

are two different warnings.

Have you made sure that the libusb at the mentioned path has a compatible architecture (32 or 64 bit)?

Regards

Yes @aha_1980 it was my mistake. I just updated the libusb files downloaded from their website and now all works fine. Thanks a lot.