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Create a static library in Qt5 and use it

I am trying to create a library for my project. (Qt5, Qt Creator, VS2010 compiler)

I started with a minimal test sample to test how it works.

1-I created a library containing a class with a method

2-I compile it and get the Dll and Lib files

3- In the main application, I add this library and its path to the .pro and verified library successfully.

Now I want to get rid of the DLL and use the lib file as a static library.

So, I added this line to my .pro library file

CONFIG+=staticlib

Now I get the lib file after compilation, but I cannot use it in my project, and I get unresolved external characters ... errors

when I remove CONFIG + = staticlib it works again! but not static.

these are the lines that I added to the .pro file of the main project for loading / linking the library

 INCLUDEPATH +="G:/TestLib/testLib" LIBS +=-l"G:/Build/debug/testLib"

So the question is: is it possible to have my own static library in Qt (not a commercial license)?

If so, what's wrong with my approach?

shoud am I changing something in LIBS + = ... to indicate its static library?

I read this article and there seems to be something wrong with my code.

Any help please?

EDIT: problem resolved
The problem was that we did not need Q_DECL_EXPORT and Q_DECL_IMPORT for static libraries! which is not mentioned in this sketchy illusory article.

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Problem resolved

The problem was that we did not need Q_DECL_EXPORT and Q_DECL_IMPORT for static libraries! which is not mentioned in this sketchy illusory article.

Q_DECL_EXPORT and Q_DECL_IMPORT required for dynamic libraries.

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