commit | b5bd025ce14f0f1a898cd29f0aa3b7abf1d7f757 | [log] [tgz] |
---|---|---|
author | Dmitri Gribenko <dmitrig@google.com> | Mon Aug 05 02:58:22 2024 -0700 |
committer | Copybara-Service <copybara-worker@google.com> | Mon Aug 05 02:59:07 2024 -0700 |
tree | cffefa8c47b9c610029a0b9f153269b30d66b908 | |
parent | 94ef642d0f2f92352fe749aa0a456aa1de3ccf2c [diff] |
Pass down `extra_rustc_flag` when compiling bindings for the C++ standard library The `bindings_for_toolchain_headers` rule that compiles the `cc_std` target eventually calls `construct_arguments()` which reads `extra_rustc_flag`. `extra_rustc_flag` can be used, for example, to enable Memory Sanitizer, and thus it is critical that it is passed down to every rustc action. PiperOrigin-RevId: 659488753 Change-Id: I5f5c630b08d6f62ebf3358efc2c283fc2f336c4d
NOTE: Crubit currently expects deep integration with the build system, and is difficult to deploy to environments dissimilar to Google's monorepo. We do not have our tooling set up to accept external contributions at this time.
Crubit is a bidirectional bindings generator for C++ and Rust, with the goal of integrating the C++ and Rust ecosystems.
Support for calling FFI-friendly C++ from Rust is in progress.
Support for calling Rust from C++ will arrive in 2024H2.
Consider the following C++ function:
extern "C" bool IsGreater(int lhs, int rhs);
This function, if present in a header file which is processed by Crubit, becomes callable from Rust as if it were defined as:
pub fn IsGreater(lhs: ffi::c_int, rhs: ffi::c_int) -> bool {...}
Note: There are some temporary restrictions on the API shape. For example, functions that are not extern "C"
, or that accept a type like std::string
, can't be called from Rust directly via Crubit. These restrictions will be relaxed over time.
Here are some resources for getting started with Crubit:
Rust Bindings for C++ Libraries is a detailed walkthrough on how to use C++ from Rust using Crubit.
The examples/cpp/
directory has copy-pastable examples of calling C++ from Rust, together with snapshots of what the generated Rust interface looks like.
$ apt install clang lld bazel $ git clone git@github.com:google/crubit.git $ cd crubit $ bazel build --linkopt=-fuse-ld=/usr/bin/ld.lld //rs_bindings_from_cc:rs_bindings_from_cc_impl
$ git clone https://github.com/llvm/llvm-project $ 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