rust-bindgen is a code generator that automatically produces Rust FFI bindings to C and some C++ libraries.
The tool solves the problem of manually writing Rust foreign function interface code to call C and C++ libraries. It works by parsing C header files using libclang and generating corresponding Rust FFI declarations, allowing developers to invoke C library functions and use C types directly from Rust without hand-writing the bindings layer.
Developers should choose rust-bindgen when integrating existing C or C++ libraries into Rust projects and want to avoid the error-prone work of manually transcribing type definitions and function signatures. It suits any project that depends on C libraries and needs to maintain those bindings as the underlying C code evolves. The tool provides both a library API for programmatic use and a command-line interface, and supports customization through environment variables to handle cross-compilation scenarios and non-standard library locations.
The project maintains a minimum supported Rust version of 1.71.0 for the library, though the command-line tool may require a newer version due to its dependencies. The project does not follow a fixed release schedule and requests for releases are handled on demand. Development activity shows responsiveness to user needs through environment variable configuration options that address real-world cross-compilation challenges, including per-target clang argument support. The tool's design acknowledges that generated bindings can remain compatible with older Rust versions even when the generator itself requires a newer compiler.
