setup compiler

.gitignore

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+/target

Cargo.toml

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+cargo-features = ["codegen-backend"]
+
+[[bin]]
+name = "game"
+path = "src/game/main.rs"
+
+[[bin]]
+name = "snake"
+path = "src/snake/main.rs"
+
+[package]
+name = "glite"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+bevy = { version = "0.15.0", features = ["dynamic_linking"] }
+
+# Enable a small amount of optimization in the dev profile.
+[profile.dev]
+opt-level = 1
+codegen-backend = "cranelift"
+
+# Enable a large amount of optimization in the dev profile for dependencies.
+[profile.dev.package."*"]
+codegen-backend = "llvm"
+opt-level = 3
+
+[unstable]
+codegen-backend = true
+
+# Enable more optimization in the release profile at the cost of compile time.
+[profile.release]
+# Compile the entire create as one unit.
+# Slows compile times, marginal improvements.
+codegen-units = 1
+# Do a second optimization pass over the entire program, including dependencies.
+# Slows compile times, marginal improvements.
+lto = "thin"
+
+# Optimize for size in the wasm-release profile to reduce load times and bandwidth usage on web.
+[profile.wasm-release]
+# Default to release profile values.
+inherits = "release"
+# Optimize with size in mind (also try "z", sometimes it is better).
+# Slightly slows compile times, great improvements to file size and runtime performance.
+opt-level = "s"
+# Strip all debugging information from the binary to slightly reduce file size.
+strip = "debuginfo"
+

src/game/main.rs

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+use bevy::prelude::*;
+
+#[derive(Component)]
+struct Person;
+
+#[derive(Component)]
+struct Name(String);
+
+fn add_people(mut commands: Commands) {
+    commands.spawn((Person, Name("Elaina Proctor".to_string())));
+    commands.spawn((Person, Name("Renzo Hume".to_string())));
+    commands.spawn((Person, Name("Zayna Nieves".to_string())));
+}
+
+#[derive(Resource)]
+struct GreetTimer(Timer);
+fn greet_people(time: Res<Time>, mut timer: ResMut<GreetTimer>, query: Query<&Name, With<Person>>) {
+    // update our timer with the time elapsed since the last update
+    // if that caused the timer to finish, we say hello to everyone
+    if timer.0.tick(time.delta()).just_finished() {
+        for name in &query {
+            println!("hello {}!", name.0);
+        }
+    }
+}
+fn change_names(mut query: Query<&mut Name, With<Person>>) {
+    for mut name in &mut query {
+        if name.0 == "Elaina Proctor" {
+            name.0 = "Elain Hume".to_string();
+            break;
+        }
+    }
+}
+
+fn hello_world() {
+    println!("hello world!");
+}
+
+pub struct HelloPlugin;
+
+impl Plugin for HelloPlugin {
+    fn build(&self, app: &mut App) {
+        app.insert_resource(GreetTimer(Timer::from_seconds(2.0, TimerMode::Repeating)));
+        app.add_systems(Startup, add_people);
+        app.add_systems(Update, (change_names, greet_people).chain());
+    }
+}
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .add_plugins(HelloPlugin)
+        .run();
+}

src/snake/main.rs

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+fn main() {
+    App::new().add_plugins(DefaultPlugins).run();
+}