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    <p>I dislike having files shared by projects. All too often, you'll be tempted to edit one of the shared files, and you'll either break something in the other project, or you'll forget that you have to rebuild the other project at all.</p> <p>When the shared files are instead separated into their own library (package), then there's a little extra barrier to editing them. I consider that a good thing. It will be a light reminder that you're switching from project-specific code to shared code. You can use project groups to let you keep every together in a single IDE instance. arrange the library projects ahead of the executable projects. The "build all" command will build everything in order, starting with the first project.</p> <p>Keep your DCU files separate from your PAS files. You can do this easily by setting the "DCU output directory" project option to send your package's units to some other location. Then put that destination directory on your other projects' "search path." They'll find the DCU, but they won't find the PAS file, and so no other project will accidentally recompile a unit that isn't really a member.</p> <p>Having a separate package also discourages use of project-specific conditional defines. Those cause all sorts of trouble when you're sharing units between projects. Find a way to instead keep all project-specific options within the respective projects. A shared library shouldn't require project-specific modifications. If a library needs to act differently based on who's using it, then employ techniques like callback functions that the library user can set to modify the library's behavior.</p>
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    1. USRob Kennedy
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