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

A modern C++ module-first build tool — written in pure C++23 modules, fully self-hosted

Native C++23 module support — import std handled automatically, file-level incremental builds, automatic module dependency analysis, zero manual configuration Pure modular self-hosting — mcpp itself consists of 43+ C++23 modules and builds itself; the module pipeline is battle-tested Works out of the box — one-command install, bundled GCC 16 / LLVM 20 toolchains downloaded into an isolated sandbox, never polluting your system Integrated dependency management — SemVer constraint resolution, lockfile, cross-project BMI cache, custom package indices Multi-package workspaces — unified lockfile and version management for larger projects Why mcpp mcpp is built specifically for C++23 module-first development . If you want to use import std , module interface units ( .cppm ), module partitions, and other modern C++ features in your project, mcpp gives you a smooth, friendly experience on Linux, macOS ARM64, and Windows x86_64: