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Re: Organizing 2 project which share code

From: Lars-Christian Schulze
Subject: Re: Organizing 2 project which share code
Date: Thu, 15 Nov 2001 12:01:23 +0100 (MET)

On Fri, 16 Nov 2001, Giuseppe Milicia wrote:

> Hi everyone,
> I have to set up CVS to handle 2 projects which share lots of code. The
> shared code is evolving, and I want people working on either project to be
> able to modify the common code.
> Nevertheless people on different projects should not be aware of project
> specific code.
> So when you do an update/commit on common code everyone gets is.
> But when you do a checkout you do not get the project specific code...
> What would be the best way to organize this?? Actually is it possible at
> all? 

Dear Giuseppe,

the normal way to deal with this problem is to use libraries.  Therefore:

 -  Extract the common code from the 2 projects and put it into a library.
    Treat that library as an independent third project.

 -  Define a separate module for the library within CVS.

 -  Define a clear interface to the library and develop it together with
    application code step by step.

 -  Define baselines, i.e. say: This is version x.y of the library and all
    changes from now on are relative to this version.
    This also give you the change to go back to a well known version if
    something bad happens.

 -  Only one team should be responsible for modifiying the library.

 -  If both project teams must be able to modify the library, assign a
    person who is responsible for coordinating the activities in
    order to avoid incompatible changes.

This sounds a little bit complicated, but otherwise you will run into
trouble sooner or later and if the projects grow the code will become

Hope this helps.


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