[bug] Unable to find dependencies' headers about conan HOT 2 CLOSED

Hi @Todiq thanks a lot for taking the time to open the report, and for creating a repro to share your use-case, it's really appreciated! :)

This would not be a bug, but expected behaviour from Conan. Requirements can specify how and what of its contents is propagated by using traits (docs here)
In this case, as alpha exposes rapidjson headers in its public api, its requirement clause should set the transitive_headers=True trait, like self.requires("rapidjson/cci.20230929", transitive_headers=True), which will tell Conan that this dependency's headers should be propagated downstream.

Let me know if any of this makes sense and helps with your issue, happy to answer further questions if not :)

from conan.

Thank you! That indeed works now.

My real project's tree is quite complex and it looked like this issue happened specifically with rapidjson.

It was actually because the downstream packages had direct dependencies to the other requirements, but not that one, hence the false hint.

Thanks a lot once again!

from conan.