Show HN: Modern C++ Build Tools for Module Feature

mcpp is a modern C++ build tool written in pure C++23 modules that provides native support for C++23 module features, including automatic `import std` handling and file-level incremental builds. The tool is self-hosted, fully modular, and works out-of-the-box with bundled compilers (GCC 16/LLVM 20) without requiring manual configuration, plus it includes integrated dependency management and multi-package workspace support. The project is currently in early development and welcomes community contributions from developers interested in modern C++ module-first development.