Compile a Rust smart contract module#

This guide will show you how to compile smart contract module written in Rust to a Wasm module.


Make sure to have Rust and Cargo installed and the wasm32-unknown-unknown target, together with cargo-concordium and the Rust source code for a smart contract module, you wish to compile.

See also

For instructions on how to install the developer tools see Install tools for development.

Compiling to Wasm#

To help building smart contract modules and to take advantage of features such as contract schemas, we recommend using the cargo-concordium tool for building Rust smart contracts.

In order to build a smart contract, run:

$cargo concordium build

This uses Cargo for building, but runs further optimizations on the result.

See also

For building the schema for a smart contract module, some further preparation is required.


It is also possible to compile using Cargo directly by running:

$cargo build --target=wasm32-unknown-unknown [--release]

Note that even with --release set, the produced Wasm module includes debug information.