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COMPILER_VERSIONS.md

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Compiler versions

In this repository, various different Rust and Go compiler versions are used. The following explains those compilers and their role.

Go

This repository is a Go project that is included in the destination project as a source code import. As such, the Go version used here is never the one building the final binary. Also no library is built with Go here.

The Go version here has the following goals:

  • Serve as a minimal supported version. We keep the range of supported Go versions reasonably wide to avoid unnecessary friction for users. I.e. just because Cosmos SDK now uses Go 1.19 does not mean we make 1.19 the minimal supported version here. However, the project should work with the latest stable Go version. When the majority of our users is between 1.18 and 1.19, we can slowly remove 1.17 support by bumping the min version to 1.18.
  • Be stable enough to test Go code. We always pin the patch version to ensure CI runs are reproducible. Those versions will contain security issues from time to time, but that's fine for how they are used here.

Go version locations:

  1. go.mod, e.g. go 1.17: The min Go version supported by the source code
  2. CI config, e.g. image: cimg/go:1.17.4: The min Go version we test
  3. Alpine docker, e.g. FROM golang:1.17.7-alpine: Used for testing the Go code (see ALPINE_TESTER in Makefile)

Rust

In contrast to Go, the Rust compiler used here produces actual artifacts used directly by consumer projects. This are the shared .dylib, .so, .dll libraries as well as the static .a libraries. Those libwasmvm builds contain all the Rust code executing contracts, especially cosmwasm-vm. New Rust versions usually add features which are not necessarily used or needed. But we should move with the ecosystem to keep the dependency tree compiling. Also new Rust versions tend to increase runtime speed through optimizer improvements, which never hurts.

While we should update the Rust version for the production builds, there is also a Rust version which serves as a min version for the project. This is lower to ensure we can switch between compiler versions in some range.

Production Rust compiler

This is the version set in the builders: builders/Dockerfile.alpine, builders/Dockerfile.centos7 and Dockerfile.cross.

Min Rust compiler

This is the version used in the CI. It should always be >= the min Rust version supported by cosmwasm-std/cosmwasm-vm.

Tooling Rust compiler

This Rust version is not related to our codebase directy. It's sufficiently modern to install and execute tools like cargo-audit.

Versions in use

We currently use the following version:

Type Rust version Note
Production Rust compiler 1.68.2 Builders version 0015
Min Rust compiler 1.60.0 Supports builder versions >= 0012
Tooling Rust compiler 1.65.0