How to Create Different Build Profiles (Dev, Staging, Production) in Rust

Define custom profiles in Cargo.toml under [profile.*] sections to control build settings for different environments. Add [profile.dev], [profile.staging], and [profile.prod] blocks with your specific optimization and debug settings, then build using cargo build --profile <name>.

[profile.dev]
opt-level = 0
debug = true

[profile.staging]
opt-level = 2
debug = true

[profile.prod]
opt-level = 3
debug = false
lto = true

cargo build --profile staging
cargo build --profile prod

Build profiles are like different settings presets for your project. You use them to make your code compile faster while you are working, or to make it run faster when you release it to users. It is like choosing between a 'draft' mode for quick edits and a 'final' mode for the finished product.