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Maybe if your included the main build from the samples build?

Whole main build or just the projects via projectDir?

if main build includes the samples build, and the samples build includes the main build, that is not a circular issue?

Never `include` a project in more than one build, never, ever, ever.
So yes, the whol main build.

And no, just including a build does not add any circulare dependency because it does not any dependency at all.
If you just include build B from build A and A does not depend on anything built by B, nothing from B is built.
So as long as you do not declare a real dependency cycle, you should not get into trouble.

Besides that the question also is, why your main build should depend on samples builds

well, samples build is a included build declared in the main one, but that maybe doesn't mean that it depends on samples?

As I said.
Besides that it is questionable why it even does.