CMake file for using CXX and Corrosion in CMake project to call Rust functions from C++ and C++ from Rust

This is a fork of the rusty_cmake repository to use CXX and Corrosion in a CMake project with the following modifications:

cxx_corrosion.cmake file:

• Function to get STEM is removed in a favor of one-line solution;
• Simplify by using a simple one CMakeLists file for the project;
• Windows-related code is removed (Linux and MacOS are supported);
• Minor code changes to simplify and use a modern C++.

Why?

This cmake/corrosion_cxx.cmake can be imported in any CMake project to simplify Rust code usage in C++.

Current solution is a battle-tested and cmake/corrosion_cxx.cmake file is used in a Comm application development.

Current examples

Examples are located in examples folder.

This repo examples can be used as a sandbox playground for testing simple ideas of the Rust library integration in the current C++ CMake project (examples/rust-from-cpp) and as examples of the usage and calling C++ code from Rust (examples/cpp-from-rust).

Calling Rust code from C++

Code examples to call Rust functions from C++:

• Example of using a different primitive types for arguments and returns;
• Example of using Rust Result type and Anyhow in return to C++;
• Example of using panics in Rust when calling from C++.

Dependencies

• Linux or MacOS
• CMake
• Clang
• Corrosion
• Rustup
• Nix (optional) or Docker (optional)

Build

Using CMake

Run CMake and build commands in the examples/rust-from-cpp folder:

cmake -B build . && make -C build -j4.

Then you can run the example app by calling:

build/cxx_cmake.

In Nix

If you are using Nix as a development environment you can use a nix shell with all dependencies:

nix-shell -p cmake -p clang -p rustup -p corrosion -p libiconv -p git --pure

And then run build commands from the CMake section above.

In Docker

There is a Docker file to build and run the example app in Docker container. To build it run the build command from the project root directory:

docker build . -t cxx-corrosion-cmake -f examples/Dockerfile

Then you can run the example app by calling:

docker run cxx-corrosion-cmake

Todo

Create a packages in package managers to help tracking updates in the project instead of manually track the changes.

• Make it nix package
• Make it vcpkg package

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