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xmtp-sys

Raw FFI bindings to libxmtp_ffi — the XMTP messaging protocol static library.

Note: This crate provides unsafe, low-level bindings. Prefer the safe xmtp crate for application code.

How it works

All types and functions are auto-generated by bindgen from the C header xmtp_ffi.h produced by cbindgen. Pre-generated bindings are committed to the repository so end users do not need libclang installed.

At build time, the build script:

Downloads the pre-built static library from GitHub Releases for the current target platform (or uses a local path via XMTP_FFI_DIR).
Configures the linker to link the static library plus required system dependencies.

Environment variables

Variable	Description
`XMTP_FFI_DIR`	Path to a local FFI build directory. Skips downloading.
`XMTP_FFI_VERSION`	Override the FFI release version (default: crate version).
`XMTP_UPDATE_BINDINGS`	When set with `regenerate` feature, copy generated bindings back to `src/bindings.rs`.

Features

Feature	Description
`regenerate`	Re-generate bindings from `xmtp_ffi.h` at build time (requires `libclang`).

Supported platforms

Target	Status
`x86_64-unknown-linux-gnu`	✅
`aarch64-unknown-linux-gnu`	✅
`aarch64-apple-darwin`	✅
`x86_64-pc-windows-msvc`	✅
`aarch64-pc-windows-msvc`	✅

License