[anybodyz]

Many of them use this tool: https://www.fastbuild.org/docs/home.html

It's was built and is regularly maintained by a Riot Games principal C++ architect, and automatically compiles files in large "unity" chunks, distributes builds across all machines in an organization, and creates convenient Visual Studio .sln files, and XCode projects. It's also all command line driven and open source.

This is industrial strength C++ builds for very large rapidly changing code bases. It works.