Buildy

Buildy is a simple Rust-based build tool for C/C++ projects. It tracks file dependencies (via gcc -MM), computes hashes, and performs incremental compilation with a daemon mode and a REPL interface.

Features

• Scans source (.c, .cpp, .h, etc.) files and builds a dependency graph
• Computes file hashes and last-modified times to detect dirtiness
• Topologically sorts changed files and compiles in parallel using all CPU cores
• Parses user headers using GCC/G++ flags; ignores system headers
• Maintains a cache to avoid unnecessary recompilation
• Watch mode with interactive REPL (build, run, close, help)
• Tracks deleted/renamed files and invalidates cache accordingly
• Supports specifying project root via --root option

Usage

Build from source:

cargo build --release

Run one-shot build in current or specified directory:

cargo run -- build           # build in current directory
cargo run -- --root=path build # build in given path

Start the daemon with REPL:

cargo run -- watch

Commands available in REPL:

• build – trigger a build based on changed files
• run – execute the linked binary (named after project directory)
• close or exit – save state and quit the daemon
• help – display command list

The tool stores its cache in .buildy_cache.json in the project root.

Notes

Currently only C and C++ compilation is supported (using gcc/g++). For release builds you can modify flags or extend configuration.

This repository is a starting point; further enhancements such as compiler-version detection, custom flags, or more intelligent incremental scanning can be added. EOF"