Cargo vs go build: Rust and Go Builds in CI
Cargo and go build are each their language’s native tool - the real CI question is compile time and how well each caches.
Cargo is Rust’s build tool and package manager, with a lockfile and a rich dependency graph. go build (with go modules) compiles Go quickly with a simple dependency model and an aggressive build cache. This compares the two ecosystems’ CI behavior rather than picking a language.
| Cargo (Rust) | go build (Go) | |
|---|---|---|
| Lockfile | Cargo.lock | go.sum + go.mod |
| Typical compile time | Longer (LLVM, monomorphization) | Fast |
| Build cache | target/ + registry cache | Go build cache (very effective) |
| Incremental builds | Yes | Yes (cache-driven) |
| CI cache key | Hash of Cargo.lock | Hash of go.sum |
In CI
Go builds are usually fast and the Go build cache makes repeat CI compiles very cheap once cached. Rust compiles tend to be slower due to LLVM codegen and generics monomorphization, so caching Cargo’s target/ directory and the registry cache matters a lot - and tools like sccache can help further. Neither tool is “better”; they reflect each language’s compile model.
Speed up either
For Rust, cache ~/.cargo/registry and the project target/ keyed on Cargo.lock, and consider sccache for shared compilation caching. For Go, cache the Go build cache and module cache keyed on go.sum. Caching is the single biggest CI lever for both.
The verdict
These are language-native tools, not interchangeable choices: use Cargo for Rust and go build for Go. The CI takeaway is that Rust benefits most from aggressive build caching, while Go is fast out of the box and gets faster with its build cache.