How do I tell Cargo to build files other than main.rs?

Question

Here is my directory structure:

lowks@lowkster ~/src/rustlang/gettingrusty $ tree .
.
├── Cargo.lock
├── Cargo.toml
├── foo.txt
├── src
│   ├── boolean_example.rs
│   ├── function_goodbye_world.rs
│   ├── listdir.rs
│   ├── looping.rs
│   ├── main.rs
│   ├── pattern_match.rs
│   └── write_to_file.rs
└── target
    ├── build
    ├── deps
    ├── examples
    ├── gettingrusty
    └── native

6 directories, 11 files

When I run 'cargo build', it seems to only build main.rs. How should I change Cargo.toml to build the rest of the files too?

score 40 · Answer 1 · edited Dec 01 '18 at 12:26

40

Put other.rs file into bin subfolder of src folder (./src/bin/other.rs). And run cargo build --bin other or cargo run --bin other

edited Dec 01 '18 at 12:26

rofrol

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answered May 25 '18 at 13:02

Andriy Viyatyk

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1

This also works by running `cargo build` . No need to append the file name. – Jerry Ajay Apr 11 '20 at 13:02

Francis Gagné · Accepted Answer · 2020-07-29T22:50:37.000

The Rust compiler compiles all the files at the same time to build a crate, which is either an executable or a library. To add files to your crate, add mod items to your crate root (here, main.rs) or to other modules:

mod boolean_example;
mod function_goodbye_world;
mod listdir;
mod looping;
mod pattern_match;
mod write_to_file;

To access items defined in another module from your crate root, you must qualify that item with the module name. For example, if you have a function named foo in module looping, you must refer to it as looping::foo.

You can also add use statements to import names in the module's scope. For example, if you add use looping::foo;, then you can just use foo to refer to looping::foo.

For more information, see Separating Modules into Different Files in The Rust Programming Language.

score 18 · Answer 3 · answered Mar 19 '20 at 15:19

18

There are a few different types of binaries or targets that cargo recognizes:

For example, if the file boolean_example.rs is a standalone example that you want to run you can put in inside an examples directory and tell cargo about it like so:

[[example]]
name = "boolean" # examples/boolean.rs

This lets you invoke your example with cargo run --example boolean

Read the cargo book's page on package layout as well to see how these target directories can be structured.

answered Mar 19 '20 at 15:19

Gwen

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What file do you put this description into ? – bokan Jul 21 '22 at 14:05
1

@bokan You put that in `Cargo.toml`. – MEMark Aug 07 '22 at 14:54

kimo_ouz · Answer 4 · 2022-09-07T22:08:41.903

you can include your testing in the main.rs file as following >>

Filename: src/main.rs

#[cfg(test)]
mod tests {
    use super::*;
  #[test]
 fn this_test_will_pass() {
    let value = 4;
    assert_eq!(4, value);
  }

  #[test]
  fn this_test_will_fail() {
    let value = 8;
    assert_eq!(5, value);
  }
}

Or call them from your tests file. then run them using test command: cargo test

from filename: lib/tests.rs

mod tests;

tests::run();

in this case main.rs will be built but only tests.rs file will be executed.

How do I tell Cargo to build files other than main.rs?

4 Answers4

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