Mega repo or microrepos? Llvm-dev take

There is an interesting discussion going on at the llvm-dev mailing list as to whether to split their massive svn repo into multiple smaller repositories with git.

http://lists.llvm.org/pipermail/llvm-dev/2016-July/103097.html

I have come across the problem so many time and the issue ultimately boils down to workflow: tools really don't support this. I want to build the modules individually and then sometimes for integration all together. If there is a dependency between repositories I sometimes need to express it.

Surely there is a better way.