Please provide the information requested in the yellow box above.

Thanks

Hello,

It is important to follow the guide in yellow above. This will show your configuration and answer your  questions.

Thanks

Thanks for the output. I think the text file probably needs to be saved in UTF8 so that we can see your paths correctly.

For example, the sketch book path shows as this in the file you sent.

C:\Users\Oleg\OneDrive\Документы\Arduino

A few points of note:-

When working with Arduino you do not need to set the paths of any libraries. The paths are worked out automatically based on the Arduino specification and the design of your chosen hardware/toolchain.

Visual Studio is unable to compile Arduino or understand the Arduino specification. Visual Micro handles the compile and keeps the relevant properties of the project property pages up to date. Those properties are used purely for intellisense. They have no bearing on compliation.

Unless you create a C++ Shared Library project for a library (and add a project reference), a library must reside in one of the published locations. 1) IDE\Libraries 2) Platform\Libraries 3) Sketchbook\Libraries

Sketchbook\Libraries is where user installed libraries are normally placed. They have the highest priority in terms of duplicate name resolution. 1) has the lowest priority but if a library name is unique then the priority is unimportant.

When testing it is recommended that you switch the debugger off. You can usually do that by changing the configuration name on the toolbar from Debug to Release. Swithcing debug off won't resolve any issues, it simply makes the compile smaller and simpler.

Because I can't see the utf8 path of your sketchbook the RTClib can be placed in your IDE\Libraries folder that looks to be ries"

Click "vMicro>general>rescan toolchains" after changing a library location or installing a library outside of the VS IDE while it is open  (or restart the ide).

Do not attempt to include library sources into the project manually. This would cause an invalid build because libraries are not compiled alongside project code. They are compiled seperately and in some cases, depending on the spec. file of the library they are archived into .a files.

Visual Micro does support utf8 paths but the sketchbook folder you have set is a concern. Visual Micro allows you to change the SketchBook folder in the "IDE Locations" window. You could change it to simpiler text as an experiment.
C:\Users\Oleg\OneDrive\Документы\Arduino

I hope this helps. If not please zip your project and the RTCLib that you are using so that we can replicate the issue.

Adding a library via the "Add Library" menu or the "Library Manager" is a core feature, it wouldn't normally be a problem so the utf8 unicode path is a prime candidate for the issue. Please let us have the text of the actual path you have set in your sketchbook.

Thanks 

Thank you for workaround. 
I suspected the utf8 path is difficult for visual micro. So I have found workaround, moving project to the directory with simple path and specifying it on optional sketchbook location.

Update. Visual Micro Utf8 handling was improved in recent versions but the path you are trying to use is not utf8. We tried the arduino ide with your path and it also fails.

Simpler paths probably work better. The visual micro options allow for all underlying paths (build, core, hardware etc) to be changed.