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bazel / crubit / 503e0b75daaf8e8b993f6b2a0376a7420fdcb9ff
commit503e0b75daaf8e8b993f6b2a0376a7420fdcb9ff[log] [tgz]
authorGoogler <no-reply@google.com>Tue Aug 20 10:24:16 2024 -0700
committerCopybara-Service <copybara-worker@google.com>Tue Aug 20 10:25:18 2024 -0700
tree75478bc1c606e3d8c60f334e6c4adf3135e3bfa5
parentf857e773119081ef0d807f63dc431a5ad64163aa [diff]
Add "-fretain-subst-template-type-parm-type-ast-nodes" in necessary locations in Nullability code.

Clang commit https://github.com/llvm/llvm-project/commit/7f78f99fe5af82361d37adcbd2daa4d04afba13d broke crucial functionality in the nullability infrastructure. Consequently, the flag `-fretain-subst-template-type-parm-type-ast-nodes` was added in https://github.com/llvm/llvm-project/commit/661dda9df13c65ce021407bb726b558c7a414731 to reinstate that feature.

This CL adds that flag to the various places needed for the code to work properly and reinstates all tests that were broken (and consequently disabled) by the original commit.

PiperOrigin-RevId: 665420846
Change-Id: I0628e950e760393ef68312fff0ba62aa748e8dff
7 files changed
tree: 75478bc1c606e3d8c60f334e6c4adf3135e3bfa5
  1. .bazelci/
  2. bazel/
  3. cc_bindings_from_rs/
  4. common/
  5. docs/
  6. examples/
  7. features/
  8. lifetime_analysis/
  9. lifetime_annotations/
  10. migrator/
  11. nullability/
  12. rs_bindings_from_cc/
  13. support/
  14. .bazelrc
  15. .gitignore
  16. BUILD
  17. Cargo.lock
  18. CODE_OF_CONDUCT
  19. CONTRIBUTING
  20. LICENSE
  21. MODULE.bazel
  22. README.md
  23. WORKSPACE.bzlmod
README.md

Crubit: C++/Rust Bidirectional Interop Tool

Build status

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.

Status

Support for calling FFI-friendly C++ from Rust is in progress.

Support for calling Rust from C++ will arrive in 2024H2.

Example

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.

Getting Started

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.

Building Crubit

$ 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

Using a prebuilt LLVM tree

$ 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