Rust workspace

Sure! Let's create a simple example to demonstrate how to build a specific package in a Cargo workspace.

1. Set up a Cargo workspace:
   • Create a new directory for your workspace.
   • Inside this directory, create a Cargo.toml file for the workspace.
   • Create subdirectories for each package.

Here’s an example structure:

my_workspace/
│
├── Cargo.toml
├── package_a/
│   ├── Cargo.toml
│   └── src/
│       └── main.rs
└── package_b/
    ├── Cargo.toml
    └── src/
        └── main.rs

2. Workspace Cargo.toml:

In the root of your workspace (my_workspace/Cargo.toml):

[workspace]
members = [
    "package_a",
    "package_b",
]

3. Package Cargo.toml files:

For package_a (my_workspace/package_a/Cargo.toml):

[package]
name = "package_a"
version = "0.1.0"
edition = "2021"

[dependencies]

For package_b (my_workspace/package_b/Cargo.toml):

[package]
name = "package_b"
version = "0.1.0"
edition = "2021"

[dependencies]

4. Main.rs files:

For package_a (my_workspace/package_a/src/main.rs):

fn main() {
    println!("Hello from package_a!");
}

For package_b (my_workspace/package_b/src/main.rs):

fn main() {
    println!("Hello from package_b!");
}

5. Building a specific package:

To build only package_a, navigate to the workspace root (my_workspace) and run:

cargo build -p package_a --release

This command will compile only package_a in release mode, ignoring package_b. You should see output indicating that package_a is being built and optimized.

Similarly, to build only package_b, use:

cargo build -p package_b --release

This setup shows how to organize a Cargo workspace and build specific packages within it using the -p flag.