fix: Make adjustments

crates/bevy_app/src/lib.rs

@@ -32,13 +32,14 @@ pub mod prelude {
  #[cfg(feature = "fixed_time")]
  pub use crate::main_schedule::{
  FixedFirst, FixedLast, FixedPostUpdate, FixedPreUpdate, FixedUpdate, RunFixedMainLoop,
+ RunFixedMainLoopSystem,
  };
  #[doc(hidden)]
  pub use crate::{
  app::{App, AppExit},
  main_schedule::{
- First, Last, Main, PostStartup, PostUpdate, PreStartup, PreUpdate,
- RunFixedMainLoopSystem, SpawnScene, Startup, Update,
+ First, Last, Main, PostStartup, PostUpdate, PreStartup, PreUpdate, SpawnScene, Startup,
+ Update,
  },
  sub_app::SubApp,
  Plugin, PluginGroup,

crates/bevy_app/src/main_schedule.rs

@@ -394,6 +394,7 @@ impl FixedMain {
 ///
 /// Note that in contrast to most other Bevy schedules, systems added directly to
 /// [`RunFixedMainLoop`] will *not* be parallelized between each other.
+#[cfg(feature = "fixed_time")]
 #[derive(Debug, Hash, PartialEq, Eq, Copy, Clone, SystemSet)]
 pub enum RunFixedMainLoopSystem {
  /// Runs before the fixed update logic.

crates/bevy_time/src/fixed.rs

@@ -69,12 +69,14 @@ use crate::virt::Virtual;
 /// frame. Any [`overstep()`](Time::overstep) present in the accumulator will be
 /// processed according to the new [`timestep()`](Time::timestep) value.
 #[derive(Debug, Copy, Clone)]
+#[cfg(feature = "fixed_time")]
 #[cfg_attr(feature = "bevy_reflect", derive(Reflect))]
 pub struct Fixed {
  timestep: Duration,
  overstep: Duration,
 }
 
+#[cfg(feature = "fixed_time")]
 impl Time<Fixed> {
  /// Corresponds to 64 Hz.
  const DEFAULT_TIMESTEP: Duration = Duration::from_micros(15625);
@@ -229,6 +231,7 @@ impl Time<Fixed> {
  }
 }
 
+#[cfg(feature = "fixed_time")]
 impl Default for Fixed {
  fn default() -> Self {
  Self {

crates/bevy_time/src/lib.rs

@@ -194,6 +194,7 @@ mod tests {
  counter.0 += 1;
  }
 
+ #[cfg(feature = "fixed_time")]
  fn report_time(
  mut frame_count: Local<u64>,
  virtual_time: Res<Time<Virtual>>,
@@ -214,6 +215,7 @@ mod tests {
  }
 
  #[test]
+ #[cfg(feature = "fixed_time")]
  fn fixed_main_schedule_should_run_with_time_plugin_enabled() {
  // Set the time step to just over half the fixed update timestep
  // This way, it will have not accumulated enough time to run the fixed update after one update
@@ -222,7 +224,6 @@ mod tests {
  let time_step = fixed_update_timestep / 2 + Duration::from_millis(1);
 
  let mut app = App::new();
- #[cfg(feature = "fixed_time")]
  app.add_systems(FixedUpdate, count_fixed_updates);
 
  app.add_plugins(TimePlugin)
@@ -272,6 +273,7 @@ mod tests {
  }
 
  #[test]
+ #[cfg(feature = "fixed_time")]
  fn events_get_dropped_regression_test_11528() -> Result<(), impl Error> {
  let (tx1, rx1) = std::sync::mpsc::channel();
  let (tx2, rx2) = std::sync::mpsc::channel();
@@ -313,6 +315,7 @@ mod tests {
  }
 
  #[test]
+ #[cfg(feature = "fixed_time")]
  fn event_update_should_wait_for_fixed_main() {
  // Set the time step to just over half the fixed update timestep
  // This way, it will have not accumulated enough time to run the fixed update after one update