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docs: describe IsTopLevelProject for test-only dependencies

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Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Jorijn van der Graaf 2026-10-02 22:02:40 +02:00
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@ -83,6 +83,8 @@ cfg.dependencies = { math };
Clones share the external cache and identical specs share one `Configuration`. An unpinned source is `git pull`ed on every invocation; set `.commit` for reproducible, offline-after-first-fetch builds.
A project loaded this way runs its `CrafterBuildProject` as a dependency, and `IsTopLevelProject()` is `false` while it does (`true` in the project crafter-build was pointed at, and outside any project file). Wire test-only dependencies behind it: a library whose test links crafter-build itself would otherwise load crafter-build's `project.cpp` from inside crafter-build and recurse.
### Dependencies of project.cpp itself
`project.cpp` can import modules from another crafter-build project. The file has to compile before it can say anything, so the dependency is a directive next to the `import` it enables: