Demonstrates how a library crate can access build time information about an end-user crate via a build script.

You can run the user binaries with

cargo run --bin app_init

and

cargo run --bin app_main

Crates

• user: The "user" of our library crate build-ctx which calls into build-ctx-codegen in its build script.
• build-ctx: The actual library crate that will provide most of the functionality to the dependent crate.
• build-ctx-codegen: The crate that the build script will call to do the code generation required for build-ctx to do its work.

References

• Cargo Environment Variables
• Cargo Build Scripts
• Cargo Workspace Dependencies