Bug: 153207424

Clone this repo:
  1. 439138e Update TEST_MAPPING by Jeff Vander Stoep · 9 days ago master
  2. e945fa8 Merge "Upgrade bindgen to 0.63.0" by Treehugger Robot · 5 weeks ago emu-33-release main-16k-with-phones
  3. 78dc16f Upgrade bindgen to 0.63.0 by Jeff Vander Stoep · 9 weeks ago
  4. 4041b3b Temporarily use libclap_deprecated am: 256c6901a5 am: c83eb534c4 am: ff964683cf am: b8520ce7a3 by Jeff Vander Stoep · 7 months ago
  5. b8520ce Temporarily use libclap_deprecated am: 256c6901a5 am: c83eb534c4 am: ff964683cf by Jeff Vander Stoep · 7 months ago

crates.io docs.rs


bindgen automatically generates Rust FFI bindings to C (and some C++) libraries.

For example, given the C header doggo.h:

typedef struct Doggo {
    int many;
    char wow;
} Doggo;

void eleven_out_of_ten_majestic_af(Doggo* pupper);

bindgen produces Rust FFI code allowing you to call into the doggo library's functions and use its types:

/* automatically generated by rust-bindgen 0.99.9 */

pub struct Doggo {
    pub many: ::std::os::raw::c_int,
    pub wow: ::std::os::raw::c_char,

extern "C" {
    pub fn eleven_out_of_ten_majestic_af(pupper: *mut Doggo);

Users Guide

📚 Read the bindgen users guide here! 📚


The minimum supported Rust version is 1.57.0.

No MSRV bump policy has been established yet, so MSRV may increase in any release.

The MSRV is the minimum Rust version that can be used to compile bindgen. However, bindgen can generate bindings that are compatible with Rust versions below the current MSRV.

API Reference

API reference documentation is on docs.rs

Environment Variables

In addition to the library API and executable command-line API, bindgen can be controlled through environment variables.

End-users should set these environment variables to modify bindgen's behavior without modifying the source code of direct consumers of bindgen.

  • BINDGEN_EXTRA_CLANG_ARGS: extra arguments to pass to clang
    • Arguments are whitespace-separated
    • Use shell-style quoting to pass through whitespace
    • Examples:
      • Specify alternate sysroot: --sysroot=/path/to/sysroot
      • Add include search path with spaces: -I"/path/with spaces"
  • BINDGEN_EXTRA_CLANG_ARGS_<TARGET>: similar to BINDGEN_EXTRA_CLANG_ARGS, but used to set per-target arguments to pass to clang. Useful to set system include directories in a target-specific way in cross-compilation environments with multiple targets. Has precedence over BINDGEN_EXTRA_CLANG_ARGS.

Additionally, bindgen uses libclang to parse C and C++ header files. To modify how bindgen searches for libclang, see the clang-sys documentation. For more details on how bindgen uses libclang, see the bindgen users guide.


We don't follow a specific release calendar, but if you need a release please file an issue requesting that (ping @emilio for increased effectiveness).


See CONTRIBUTING.md for hacking on bindgen!