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Documentation
C/C++ Language Guide
Setup

Setup development environment for C/C++

To write Golem components in C or C++, a couple of common WebAssembly tools need to be installed, as well as the latest version of the WASM SDK.

Install WebAssembly tooling

First of all, to install wasm-tools via cargo, you need to install the latest stable version of Rust. The recommended way to do so is using https://rustup.rs (opens in a new tab):

Install Rust

Install rustup

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

Install the latest stable version of Rust

rustup install stable && rustup default stable

Add the WASI target

rustup target add wasm32-wasip1

Install wasm-tools

cargo install --force --locked  wasm-tools@1.223.0

Confirm the installation:

wasm-tools --version
wasm-tools 1.223.0

Install wit-bindgen

cargo install --force --locked wit-bindgen-cli@0.37.0

Confirm the installation:

wit-bindgen --version
wit-bindgen-cli 0.37.0
⚠️

Golem requires a specific version of wasm-tools and wit-bindgen. Please make sure the correct version is installed with the commands described above.

Install WASI SDK 25.0

Download and extract WASI SDK 25.0 (opens in a new tab) somewhere. In the examples we assume that the WASI_SDK_PATH environment variable is set up pointing to the extracted SDK.

The SDK contains a version of Clang that can compile to WebAssembly modules, which can be converted into Golem components using the wit-bindgen and wasm-tools command line tools.

Worker to Worker CommunicationDefining Components