Best approach to keep a set of common functions

[czdcriacoes]

Hi all,

I'd like to know the best approach for keeping one or more sources containing functions in a way I can reuse them easily in several projects. Or, in other words, I'd like to create a personal library of common functionalities (custom math functions, for example).
And, as a newbie, how I follow that approach in Qt Creator (menu options etc.)?

P.S.:
if answer is ".lib's", I've tried to create .lib's at %CPPLIBS% directory but I failed in each step :-( ...
how do I create .lib in Qt Creator?

[Zlatomir]

To create a library with Creator you do this: New project -> Other Project -> C++ Library and in the dialog that appears after you can configure if you create a shared library or a statically linked one (from what i understand this is what you want).

//Another way that may fit your needs is to create a header only library.

[czdcriacoes]

ok, I'll try both of them.

And how do I use each of them in the client project? I'm using #include but it doesn't work. The "Add library..." option always look for a .lib, which I can't find it anywhere :-(

[Zlatomir]

To reuse a library in a project you use the qmake's: INCLUDEPATH and (if necessary) LIBS in the project file (.pro extension).

[czdcriacoes]

error message:

undefined reference to <myfunction>