[riot-notifications] [RIOT-OS/RIOT] Define requirements for configuration in the build system (#14027)

Marian Buschsieweke notifications at github.com
Wed May 6 09:31:38 CEST 2020

>     * Must not allow circular dependencies

I think this is hard to avoid. I know how much of an issue this is for Linux distribution when package A depends on B and B depends on A. In that case you have to e.g. build A first in a stripped down version that does not depend on B in order to build B. And often you have to loop rebuild them over and over until finally all features can be build.

But the difference here is: In RIOT the headers will just always be available. Thus, it should be no issue to build A without B already being build in the other way round. (If this is a concern: We could write this down that we expect that every module should be able to compile without any of its dependencies being compiled yet - so that only at the linking stage all dependencies need to be available. But as every module happened to comply with this already, I guess this either is just so natural or so obvious, that we could just rely on this not going to happen without a written rule.)

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