Auto-linking support for clang on Windows was added in Boost 1.71, so if
you're using something older than that: this is why it's not working.
Thank you very much, that explains it: I'm using boost 1.70 for this project on all platforms.
Ok now I need to decide if it's worth upgrading or switch to explicit linking, but at least the situation is clearer.
Thank you all for your time.
A. Joël Lamotte