Revert "Allow partial support for bevy_log in no_std (#18782)" (#18816)

This reverts commit ac52cca.

Fixes #18815

the interest of providing no_std support, specifically no_atomic
support). That tradeoff isn't worth it, especially given that tracing is
likely to get no_atomic support.

Revert #18782

Author: cart

Cargo.toml

@@ -137,6 +137,7 @@ default = [
   "bevy_gizmos",
   "bevy_gltf",
   "bevy_input_focus",
+  "bevy_log",
   "bevy_mesh_picking_backend",
   "bevy_pbr",
   "bevy_picking",
@@ -158,7 +159,6 @@ default = [
   "smaa_luts",
   "sysinfo_plugin",
   "tonemapping_luts",
-  "tracing",
   "vorbis",
   "webgl2",
   "x11",
@@ -274,6 +274,9 @@ bevy_dev_tools = ["bevy_internal/bevy_dev_tools"]
 # Enable the Bevy Remote Protocol
 bevy_remote = ["bevy_internal/bevy_remote"]
 
+# Enable integration with `tracing` and `log`
+bevy_log = ["bevy_internal/bevy_log"]
+
 # Enable input focus subsystem
 bevy_input_focus = ["bevy_internal/bevy_input_focus"]
 
@@ -300,10 +303,7 @@ trace_tracy_memory = [
 ]
 
 # Tracing support
-tracing = ["bevy_internal/tracing", "dep:tracing"]
-
-# Enables traces within Bevy using tracing
-trace = ["bevy_internal/trace", "tracing"]
+trace = ["bevy_internal/trace", "dep:tracing"]
 
 # Basis Universal compressed texture support
 basis-universal = ["bevy_internal/basis-universal"]
@@ -1581,7 +1581,7 @@ wasm = true
 name = "headless"
 path = "examples/app/headless.rs"
 doc-scrape-examples = true
-required-features = []
+required-features = ["bevy_log"]
 
 [package.metadata.example.headless]
 name = "Headless"

crates/bevy_animation/Cargo.toml

@@ -47,18 +47,6 @@ tracing = { version = "0.1", default-features = false, features = ["std"] }
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 # TODO: Assuming all wasm builds are for the browser. Require `no_std` support to break assumption.
 uuid = { version = "1.13.1", default-features = false, features = ["js"] }
-bevy_log = { path = "../bevy_log", version = "0.16.0-rc.4", default-features = false, features = [
-  "web",
-] }
-bevy_app = { path = "../bevy_app", version = "0.16.0-rc.4", default-features = false, features = [
-  "web",
-] }
-bevy_platform = { path = "../bevy_platform", version = "0.16.0-rc.4", default-features = false, features = [
-  "web",
-] }
-bevy_reflect = { path = "../bevy_reflect", version = "0.16.0-rc.4", default-features = false, features = [
-  "web",
-] }
 
 [lints]
 workspace = true

crates/bevy_gltf/Cargo.toml

@@ -66,24 +66,6 @@ serde_json = "1"
 smallvec = "1.11"
 tracing = { version = "0.1", default-features = false, features = ["std"] }
 
-[target.'cfg(target_arch = "wasm32")'.dependencies]
-# TODO: Assuming all wasm builds are for the browser. Require `no_std` support to break assumption.
-bevy_log = { path = "../bevy_log", version = "0.16.0-rc.4", default-features = false, features = [
-  "web",
-] }
-bevy_app = { path = "../bevy_app", version = "0.16.0-rc.4", default-features = false, features = [
-  "web",
-] }
-bevy_platform = { path = "../bevy_platform", version = "0.16.0-rc.4", default-features = false, features = [
-  "web",
-] }
-bevy_reflect = { path = "../bevy_reflect", version = "0.16.0-rc.4", default-features = false, features = [
-  "web",
-] }
-bevy_tasks = { path = "../bevy_tasks", version = "0.16.0-rc.4", default-features = false, features = [
-  "web",
-] }
-
 [dev-dependencies]
 bevy_log = { path = "../bevy_log", version = "0.16.0-rc.4" }
 

crates/bevy_internal/Cargo.toml

@@ -10,9 +10,7 @@ keywords = ["game", "engine", "gamedev", "graphics", "bevy"]
 categories = ["game-engines", "graphics", "gui", "rendering"]
 
 [features]
-tracing = ["bevy_log/tracing"]
 trace = [
-  "tracing",
   "bevy_app/trace",
   "bevy_asset?/trace",
   "bevy_core_pipeline?/trace",
@@ -22,18 +20,10 @@ trace = [
   "bevy_render?/trace",
   "bevy_winit?/trace",
 ]
-trace_chrome = ["tracing", "bevy_log/tracing-chrome"]
-trace_tracy = [
-  "tracing",
-  "bevy_render?/tracing-tracy",
-  "bevy_log/tracing-tracy",
-]
-trace_tracy_memory = ["tracing", "bevy_log/trace_tracy_memory"]
-detailed_trace = [
-  "tracing",
-  "bevy_ecs/detailed_trace",
-  "bevy_render?/detailed_trace",
-]
+trace_chrome = ["bevy_log/tracing-chrome"]
+trace_tracy = ["bevy_render?/tracing-tracy", "bevy_log/tracing-tracy"]
+trace_tracy_memory = ["bevy_log/trace_tracy_memory"]
+detailed_trace = ["bevy_ecs/detailed_trace", "bevy_render?/detailed_trace"]
 
 sysinfo_plugin = ["bevy_diagnostic/sysinfo_plugin"]
 
@@ -304,7 +294,6 @@ std = [
   "bevy_ecs/std",
   "bevy_input/std",
   "bevy_input_focus?/std",
-  "bevy_log/std",
   "bevy_math/std",
   "bevy_platform/std",
   "bevy_reflect/std",
@@ -356,7 +345,6 @@ async_executor = [
 # Note this is currently only applicable on `wasm32` architectures.
 web = [
   "bevy_app/web",
-  "bevy_log/web",
   "bevy_platform/web",
   "bevy_reflect/web",
   "bevy_tasks/web",
@@ -398,7 +386,8 @@ bevy_utils = { path = "../bevy_utils", version = "0.16.0-rc.4", default-features
 ] }
 bevy_tasks = { path = "../bevy_tasks", version = "0.16.0-rc.4", default-features = false }
 
-bevy_log = { path = "../bevy_log", version = "0.16.0-rc.4", default-features = false }
+# bevy (std required)
+bevy_log = { path = "../bevy_log", version = "0.16.0-rc.4", optional = true }
 
 # bevy (optional)
 bevy_a11y = { path = "../bevy_a11y", optional = true, version = "0.16.0-rc.4", features = [

crates/bevy_internal/src/default_plugins.rs

@@ -4,7 +4,7 @@ plugin_group! {
     /// This plugin group will add all the default plugins for a *Bevy* application:
     pub struct DefaultPlugins {
         bevy_app:::PanicHandlerPlugin,
-        #[cfg(feature = "tracing")]
+        #[cfg(feature = "bevy_log")]
         bevy_log:::LogPlugin,
         bevy_app:::TaskPoolPlugin,
         bevy_diagnostic:::FrameCountPlugin,

crates/bevy_internal/src/lib.rs

@@ -42,6 +42,7 @@ pub use bevy_image as image;
 pub use bevy_input as input;
 #[cfg(feature = "bevy_input_focus")]
 pub use bevy_input_focus as input_focus;
+#[cfg(feature = "bevy_log")]
 pub use bevy_log as log;
 pub use bevy_math as math;
 #[cfg(feature = "bevy_pbr")]

crates/bevy_internal/src/prelude.rs

@@ -1,10 +1,14 @@
 #[doc(hidden)]
 pub use crate::{
-    app::prelude::*, ecs::prelude::*, input::prelude::*, log::prelude::*, math::prelude::*,
-    platform::prelude::*, reflect::prelude::*, time::prelude::*, transform::prelude::*,
-    utils::prelude::*, DefaultPlugins, MinimalPlugins,
+    app::prelude::*, ecs::prelude::*, input::prelude::*, math::prelude::*, platform::prelude::*,
+    reflect::prelude::*, time::prelude::*, transform::prelude::*, utils::prelude::*,
+    DefaultPlugins, MinimalPlugins,
 };
 
+#[doc(hidden)]
+#[cfg(feature = "bevy_log")]
+pub use crate::log::prelude::*;
+
 #[doc(hidden)]
 #[cfg(feature = "bevy_window")]
 pub use crate::window::prelude::*;

crates/bevy_log/Cargo.toml

@@ -9,44 +9,24 @@ license = "MIT OR Apache-2.0"
 keywords = ["bevy"]
 
 [features]
-default = ["std", "tracing"]
-
-tracing = ["dep:tracing", "dep:tracing-subscriber", "dep:tracing-log"]
-trace = ["tracing", "tracing-error"]
-trace_tracy_memory = ["tracing", "dep:tracy-client"]
-tracing-chrome = ["tracing", "dep:tracing-chrome"]
-tracing-error = ["tracing", "dep:tracing-error"]
-tracing-tracy = ["tracing", "dep:tracing-tracy"]
-
-# Allows access to the `std` crate. Enabling this feature will prevent compilation
-# on `no_std` targets, but provides access to certain additional features on
-# supported platforms.
-std = ["bevy_app/std", "bevy_utils/std", "bevy_ecs/std"]
-
-# Enables use of browser APIs.
-# Note this is currently only applicable on `wasm32` architectures.
-web = ["bevy_app/web", "dep:tracing-wasm"]
+trace = ["tracing-error"]
+trace_tracy_memory = ["dep:tracy-client"]
 
 [dependencies]
 # bevy
-bevy_app = { path = "../bevy_app", version = "0.16.0-rc.4", default-features = false }
-bevy_utils = { path = "../bevy_utils", version = "0.16.0-rc.4", default-features = false, features = [
-  "alloc",
-] }
-bevy_ecs = { path = "../bevy_ecs", version = "0.16.0-rc.4", default-features = false }
+bevy_app = { path = "../bevy_app", version = "0.16.0-rc.4" }
+bevy_utils = { path = "../bevy_utils", version = "0.16.0-rc.4" }
+bevy_ecs = { path = "../bevy_ecs", version = "0.16.0-rc.4" }
 
 # other
-log = { version = "0.4", default-features = false }
-tracing-subscriber = { version = "0.3.1", optional = true, features = [
+tracing-subscriber = { version = "0.3.1", features = [
   "registry",
   "env-filter",
 ] }
 tracing-chrome = { version = "0.7.0", optional = true }
-tracing-log = { version = "0.2.0", optional = true }
+tracing-log = "0.2.0"
 tracing-error = { version = "0.2.0", optional = true }
-tracing = { version = "0.1", default-features = false, optional = true, features = [
-  "std",
-] }
+tracing = { version = "0.1", default-features = false, features = ["std"] }
 
 # Tracy dependency compatibility table:
 # https://github.com/nagisa/rust_tracy_client
@@ -57,7 +37,11 @@ tracy-client = { version = "0.18.0", optional = true }
 android_log-sys = "0.3.0"
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
-tracing-wasm = { version = "0.2.1", optional = true }
+tracing-wasm = "0.2.1"
+# TODO: Assuming all wasm builds are for the browser. Require `no_std` support to break assumption.
+bevy_app = { path = "../bevy_app", version = "0.16.0-dev", default-features = false, features = [
+  "web",
+] }
 
 [target.'cfg(target_os = "ios")'.dependencies]
 tracing-oslog = "0.2"

crates/bevy_log/src/android_tracing.rs

@@ -1,4 +1,4 @@
-use alloc::{ffi::CString, format, string::String, vec::Vec};
+use alloc::ffi::CString;
 use core::fmt::{Debug, Write};
 use tracing::{
     field::Field,