c 20 modules notes

Page to store info for working on c++20 modules support.

Links to c++20 modules code samples

• cxx-modules-sandbox
• cxx20-modules-examples

Other build systems c++20 module support articles

• How to Use C++20 Modules with Bazel and Clang

User Notes on possible ways to implement in SCons

• vspefs-1
• vspefs-2