CMake ≥ 3.21 supports C++20 modules. NOTE: At this time, C++20 modules and CMake only work with Visual Studio compiler AND Visual Studio generator. For example ...

C++20 will be a significant revision of C++, bringing modules, coroutines, and concepts, among its major new features. BT. ... The following is an example of generator: ...

clang:driver 'clang' and 'clang++' user-facing binaries. Not 'clang-cl' 'clang' and 'clang++' user-facing binaries. Not 'clang-cl' clang:modules C++20 modules and Clang Header Modules C++20 modules ...