Dynamic dependencies are supported by build2 (this is, for example, how we handle auto-generated C/C++ headers) but it's not something that is exposed in ad hoc recipes that are written in Buildscript yet (but is exposed in those written in C++). Our plan is to start with the ability to "ingest" make dependency declarations since quite a few tools are able to produce those. Would something like this cover your use-cases?
Very likely, yes. I'm generating my own makefiles anyways, so generating something that build2 could consume should be possible, too.
Would it be appropriate to open a github issue for discussing this further? I would like to share some example for how my current setup is working and having the github syntax available would be helpful.
