There is no classical treatise on the design and implementation build systems; no faithful textbook every toolchain engineer has on their bookshelf. If there were we would need to throw it out anyway, because C++20 modules required a significant rethink of how build systems orchestrate compilation of C++ software.
It's been said over and over again that C++20 modules complicate the classic compile and link steps for C++. However, few have dived into how exactly build systems are dealing with this step-change in complexity. Talks will demo a few raw compiler invocations and say no more about the subject. This leaves engineers unequipped to deal with problems that arise in their builds; frustrated by opaque error messages and baffling build logs.
In this talk, we're going to fill in the rest of the blanks and explore exactly how build systems are tackling modules.
