Cbindgen can be used to generate C bindings for Rust code. It is currently being developed to support creating bindings for WebRender (by Mozilla for Firefox), but has been designed to support any project.

Features:

* Builds bindings for a crate, its mods, its dependent crates, and their mods * Only the necessary types for exposed functions are given bindings * Can specify annotations for controlling some aspects of binding * Support for generic structs and unions * Support for exporting constants and statics * Customizable formatting, can be used in C or C++ projects * Support for generating #ifdef's for #[cfg] attributes * Support for #[repr(sized)] tagged enum's