Introduce the project- nay, the organization-wide mangling scheme! Every symbol is now required to have the library's version name in its name, may as well throw in some namespaces there too. Then maintain some sort of metainfo of what part is requiring what versions, and what project is providing what versions, and... and well, at this stage you're kinda reinventing the package management, but at least you don't need a custom linker, which is a good thing, right?