I have a c# solution with two regular projects and a setup project. One of the regular projects is an executable, while the other is a dll, that I also use in other solutions. The dll project relies on there being a certain event log source, that it can log to, and since the program is intended to be run by users that are not allowed to create log sources, this source must be created at installation.

I have done this by creating an installer class for my executable project, creating the log source in the installer, and included that installer in my custom actions in the setup project. This works, but now I have to create a similar installer for every other project, that also uses that dll. 

The best solution would be, if I could write an installer for the dll, and then choose the dll for the custom actions in the setup project. This way I would only have to state the log creation requirement once. However, I am not able to select the dll project output for the custom actions in the setup project.

Another good solution would be, if I could somehow specify that the installer for the executable should be transitive, such that it would also perform install actions for any projects that the executable project depended on, but I don't know how to specify that requirement.

So what can I do to avoid duplicating installation code between different projects?