Question

I have dll project that includes additionally A.h header file. A.cpp includes A.h and B.cpp that has o header. If I do add B.cpp to visual c++ project compiler reports many errors :

Error   9   error LNK2005: "wchar_t * __stdcall aaa(int)" (?aaa@@YGPA_WH@Z) already defined in A.obj    C:\P\B.obj  pr1

There are no problems and project compiles fine in case if I leave B.cpp in project directory, but not add it to project.

That is the problem with adding B.cpp file?

Answer 1

#include is for header files, not other .cpp files.

Remove #include "B.cpp" from A.cpp, and things will start behaving properly.

Or rename B.cpp to B.h if you intend to include it.