| commit | fba1c434a8ab0e0cc67cee08833a0cdc156aab52 | [log] [tgz] |
|---|---|---|
| author | Jing Lu <lujin@google.com> | Thu Nov 02 16:07:30 2023 -0700 |
| committer | Copybara-Service <copybara-worker@google.com> | Thu Nov 02 16:08:03 2023 -0700 |
| tree | 652bab21f5a2dfa83e16be86827d7613925fed3d | |
| parent | 2030ad680997c087c1e15b5f70b7ef01a4b800f4 [diff] |
rs_bindings_from_cc: Add `#[allow(unused_imports)]` to generated re-export statements. [A recent rustc commit](https://github.com/rust-lang/rust/pull/116033/commits/482275b19422b871b986ec0400257a9b80080218) began to flag re-exports of empty modules as a case of unused_imports, which is a warning that cause Crubit-generated code to fail to compile: Crubit may fail to generate bindings for symbols in C++ namespaces but we'd still generate `mod __helper_mod_index` for it and `pub mod canonical_mod`. Add `#[allow(unused_import)]` to disable it for now to avoid CI failure. However, in the long term, we should check if module to be reexported is empty (transitively) before emitting the re-export, to make generated bindings more ergonomic and avoid hiding other kinds of unused_imports errors. PiperOrigin-RevId: 579007904 Change-Id: I34488cad3a2b68030e5bdf58f9c1543467b26803
Crubit is an experimental 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.)
$ 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