Link project with inner library

[masa4]

I added a code folder to my project with some classes and a library folder. Library folder consist some header files that used in classes and a .so file. It is like that:
codefolder:

.
├── Class1.cpp
├── Class1.h
├── Class2.cpp
├── Class2.h
└── mylib
    ├── include
    │   ├── header1.h
    │   ├── header2.h
    │   ├── header3.h
    │   ├── ...
    └── lib
        └── libmylib.so

I added whole codefolder to my project, qt creator added all cpp and headers to my project, but .so file added like this in .pro:

DISTFILES += \
    codefolder/mylib/lib/libmylib.so

Now I got several error like undefined reference to XXX class, XXX is which lays in mylibs library. Now how i can link this library with my project. I tried several thing but didnt work. And why my .so added as distfile, what is it?

EDIT:

LIBS += <full_path_to_so> #works
LIBS += <relative_path_to_so> #does not work

When I tried with full path it worked in this way. Any way to make it work with relative path?

[jsulm]

@masa4 You should set-up subdirs project, see "Solution #2: with "depends" attribute" in https://stackoverflow.com/questions/52882348/how-do-i-add-a-subproject-on-which-my-main-project-is-dependent-in-qt

[masa4]

@jsulm By the way the codefolder i added is not a qt project. just regular cpp and h files with additional .so file. Now i will look at it, thanks

[masa4]

@jsulm Nope, it didnt work

[jsulm]

@masa4 said in Link project with inner library:

it didnt work

Not a good description of a problem...

[masa4]

@jsulm Do you know a way to use LIBS with relative way? for link u shared with me, I am not sure maybe i did it wrong but the guy asking something different in that link. So I tried using LIBS again with full path and it worked. But I need relative path so program will be eligible for building at another computers/another paths too.

[jsulm]

@masa4 said in Link project with inner library:

LIBS with relative way?

What is the problem? Simply use a relative path like

LIBS += -Lsome_folder -llib_name

[masa4]

@jsulm

LIBS += -Lcodefolder/mylib/lib/ -llibmylib #cannot find -llibmylib - no such file or directory
LIBS += -Lcodefolder/mylib/lib/ -lmylib #cannot find -lmylib - no such file or directory

Both version gives these errors.

[jsulm]

@masa4 So, is there a lib called libmylib.so inside codefolder/mylib/lib?
Why would you put a binary of your lib into your source code tree AND also add the code of the lib to your project? This does not make sense and that's why I suggested to do it properly using subdirs project...