Clone this repo:


  1. b8f68e7 Google-internal change. by Jing Lu · 12 minutes ago main
  2. 828c3dd Internal-only change by Googler · 11 hours ago
  3. b112cfc Move and document Crubit features. by Devin Jeanpierre · 13 hours ago
  4. 95df6a7 [nullability] Add the shell of a `nullability_test` for smart pointers. by Martin Brænne · 20 hours ago
  5. edf5272 Use cc_embed_data for gtests too by Sam McCall · 20 hours ago

Crubit: C++/Rust Bidirectional Interop Tool

Build status

Crubit is a bidirectional bindings generator for C++ and Rust.

Please don‘t use, this is an experiment and we don’t yet know where will it take us. There will be breaking changes without warning. Unfortunately, we can't take contributions at this point.

Crubit allows for C++ code and Rust code to call each other without manually wrapping the APIs in an FFI-friendly interop layer. For example, a C++ function like this:

bool IsAbsPath(std::string_view path);

... becomes callable from Rust as if it were defined as:

pub fn IsAbsPath(path: std::string_view) -> bool {...}

Crubit automatically generates ABI-compatible bindings for structs (which can be passed both by value and by reference), functions, and methods, for a large variety of types. (Trivial types, nontrivial types, templated types, etc.)

Building Crubit

$ apt install clang lld bazel
$ git clone
$ cd crubit
$ bazel build --linkopt=-fuse-ld=/usr/bin/ld.lld //rs_bindings_from_cc:rs_bindings_from_cc_impl

Using a prebuilt LLVM tree

$ git clone
$ cd llvm-project
$ CC=clang CXX=clang++ cmake -S llvm -B build -DLLVM_ENABLE_PROJECTS='clang' -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=install
$ cmake --build build -j
$ # wait...
$ cmake --install build
$ cd ../crubit
$ LLVM_INSTALL_PATH=../llvm-project/install bazel build //rs_bindings_from_cc:rs_bindings_from_cc_impl