C++ Global variable declaration
Solution 1:
You must use extern, otherwise you will have separated bShouldRegister variables in each translation unit with probably different values.
Put this in a header file (.h):
extern bool bShouldRegister;
Put this in one of implementation files (.cpp):
bool bShouldRegister;
Solution 2:
If you can use C++17, consider using an inline variable:
// in a header file
inline bool bShouldRegister = true;
See How do inline variables work? for more information.