How to enable bevy_dev_tools?

[fhgaha]

This example says Try enabling bevy_dev_tools. How to do that?

[rparrett]

bevy_dev_tools is a cargo feature.

You can enable it in your own projects by adding the feature to the Bevy dependency declaration in your Cargo.toml file.

bevy = { version = "0.14", features = ["bevy_dev_tools"] }

Or you can enable it when running examples in the Bevy repo with

cargo run --example ui --features=bevy_dev_tools

[fhgaha]

I'm running this ui example. It uses #[cfg(feature = "bevy_dev_tools")]. It doesn't do anything like use bevy_dev_tools::*. It's not exactly the error message, its text from the code to display, line 107: "Try enabling feature "bevy_dev_tools"."

I added

use bevy_dev_tools::*;
use bevy::dev_tools::*;

but it doesn't seem to help

[rparrett]

The conditional compilation in that example won't work if you're running it outside of the Bevy project. You can either remove it:

- #[cfg(feature = "bevy_dev_tools")]

Or add a cargo feature to your own project that enables the bevy feature.

[features]
bevy_dev_tools = ["bevy/bevy_dev_tools"]

cargo run --features=bevy_dev_tools

[fhgaha]

By saying "running outside my bevy project" you mean I can't run example like cargo run --example ui? This is outside my bevy project? examples folder is right next to src folder and Cargo.toml file. Is this bevy reason or rust reason?

Also this

[features]
bevy_dev_tools = ["bevy/bevy_dev_tools"]

didn't work:

error: failed to parse manifest at `D:\MyProjects\Bevy\my_project\Cargo.toml`

Caused by:
  failed to parse the version requirement `bevy/bevy_dev_tools` for dependency `bevy_dev_tools`

Caused by:
  unexpected character 'b' while parsing major version number

[BD103]

By saying "running outside my bevy project" you mean I can't run example like cargo run --example ui? This is outside my bevy project?

I believe he means outside of the engine source code.

Caused by:
unexpected character 'b' while parsing major version number

It looks like you put bevy_dev_tools = ["bevy/bevy_dev_tools"] under [dependencies] instead of [features].

[rparrett]

Is this bevy reason or rust reason?

This is a rust thing. You can't do conditional compilation based on features of a dependency. So it works for examples within the Bevy repository/project, but not in a separate project with a Bevy dependency.

[fhgaha]

Understood. Thank you guys.