After working as a C++ developer almost all my career I am moving away from it, so I do not follow it as much. I heard that C++ modules are a step forward and a

After working as a C++ developer almost all my career I am moving away from it, so I do not follow it as much. I heard that C++ modules are a step forward and a step back. Don't remember the exact criticism. Is there a build system where one would point to a one source file and it would find its way around the whole thing? Things it wouldn't be able to deduce would be given as a comment or some preprocessor fluff. Basically implementing module system. Or maybe I did not think it through too much.