Question

I created a class (say, myclass.h/cpp). I want to use the class from many different places. Therefore, I put those files in a folder (say, C:\cpp_include) and I want to include them from whatever folder my codes are. I have a code which uses the class (say, main.cpp). In main.cpp, I include myclass:

#include "myclass.h"

I compile using a .pro file and nmake. In the .pro file, I specify the folder as:

INCLUDEPATH += C:\cpp_include

When I compile the code using nmake, myclass.h is properly included, but myclass.cpp doesn’t seem to be found by compiler.
When I specify myclass.cpp as one of the source files in .pro file:

SOURCES += main.cpp C:\cpp_include\myclass.cpp

The exe file is built correctly. But, I would like myclass.cpp file to be found automatically when myclass.h is included, i.e. without setting myclass.cpp as a source file. Would this be possible? It looks like that’s what happens with classes from Qt and Qwt (e.g .h/cpp files in /src/ folder in Qt and Qwt). Am I missing somthing?

Thanks a lot!

Daisuke

Answer 1

A simple technique is to have build scripts (makefiles) in the cpp directories. Write a rule that traverses the directories, executing the build scripts. This one step in isolating functionality and also allows one to use libraries.