Does not hit a break point

Let's suppose we have a class Foo in some static library.

Let's suppose there are 2 projects: main_bin and helper_lib.

Main_bin is the main binary and helper_lib is a shared library which is used by main_bin project.

Let's suppose both project uses this Foo class (and thus links with that static library).

If I set a break point inside of Foo's methods, it works if Foo is instantiated inside of main_bin project and does not work (i.e. debugger does not stop on it) in case Foo object is instantiated inside of helper_lib project.

If it matters, in my case Foo is derived from QObject (yeah, I know that this is not a very good way to implement QObject derived classes inside of static libs).