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# Objective - Fixes #15460 (will open new issues for further `no_std` efforts) - Supersedes #17715 ## Solution - Threaded in new features as required - Made certain crates optional but default enabled - Removed `compile-check-no-std` from internal `ci` tool since GitHub CI can now simply check `bevy` itself now - Added CI task to check `bevy` on `thumbv6m-none-eabi` to ensure `portable-atomic` support is still valid [^1] [^1]: This may be controversial, since it could be interpreted as implying Bevy will maintain support for `thumbv6m-none-eabi` going forward. In reality, just like `x86_64-unknown-none`, this is a [canary](https://en.wiktionary.org/wiki/canary_in_a_coal_mine) target to make it clear when `portable-atomic` no longer works as intended (fixing atomic support on atomically challenged platforms). If a PR comes through and makes supporting this class of platforms impossible, then this CI task can be removed. I however wager this won't be a problem. ## Testing - CI --- ## Release Notes Bevy now has support for `no_std` directly from the `bevy` crate. Users can disable default features and enable a new `default_no_std` feature instead, allowing `bevy` to be used in `no_std` applications and libraries. ```toml # Bevy for `no_std` platforms bevy = { version = "0.16", default-features = false, features = ["default_no_std"] } ``` `default_no_std` enables certain required features, such as `libm` and `critical-section`, and as many optional crates as possible (currently just `bevy_state`). For atomically-challenged platforms such as the Raspberry Pi Pico, `portable-atomic` will be used automatically. For library authors, we recommend depending on `bevy` with `default-features = false` to allow `std` and `no_std` users to both depend on your crate. Here are some recommended features a library crate may want to expose: ```toml [features] # Most users will be on a platform which has `std` and can use the more-powerful `async_executor`. default = ["std", "async_executor"] # Features for typical platforms. std = ["bevy/std"] async_executor = ["bevy/async_executor"] # Features for `no_std` platforms. libm = ["bevy/libm"] critical-section = ["bevy/critical-section"] [dependencies] # We disable default features to ensure we don't accidentally enable `std` on `no_std` targets, for example. bevy = { version = "0.16", default-features = false } ``` While this is verbose, it gives the maximum control to end-users to decide how they wish to use Bevy on their platform. We encourage library authors to experiment with `no_std` support. For libraries relying exclusively on `bevy` and no other dependencies, it may be as simple as adding `#![no_std]` to your `lib.rs` and exposing features as above! Bevy can also provide many `std` types, such as `HashMap`, `Mutex`, and `Instant` on all platforms. See `bevy::platform_support` for details on what's available out of the box! ## Migration Guide - If you were previously relying on `bevy` with default features disabled, you may need to enable the `std` and `async_executor` features. - `bevy_reflect` has had its `bevy` feature removed. If you were relying on this feature, simply enable `smallvec` and `smol_str` instead. --------- Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
75 lines
2.1 KiB
TOML
75 lines
2.1 KiB
TOML
[package]
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name = "bevy_time"
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version = "0.16.0-dev"
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edition = "2024"
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description = "Provides time functionality for Bevy Engine"
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homepage = "https://bevyengine.org"
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repository = "https://github.com/bevyengine/bevy"
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license = "MIT OR Apache-2.0"
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keywords = ["bevy"]
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[features]
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default = ["std", "bevy_reflect", "bevy_app/default"]
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# Functionality
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## Adds runtime reflection support using `bevy_reflect`.
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bevy_reflect = [
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"dep:bevy_reflect",
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"bevy_ecs/bevy_reflect",
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"bevy_app/bevy_reflect",
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]
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## Adds serialization support through `serde`.
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serialize = [
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"dep:serde",
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"bevy_ecs/serialize",
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"bevy_platform_support/serialize",
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]
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# Platform Compatibility
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## Allows access to the `std` crate. Enabling this feature will prevent compilation
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## on `no_std` targets, but provides access to certain additional features on
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## supported platforms.
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std = [
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"serde?/std",
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"bevy_reflect?/std",
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"bevy_ecs/std",
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"bevy_app/std",
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"bevy_platform_support/std",
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"dep:crossbeam-channel",
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]
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## `critical-section` provides the building blocks for synchronization primitives
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## on all platforms, including `no_std`.
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critical-section = [
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"bevy_ecs/critical-section",
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"bevy_platform_support/critical-section",
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"bevy_reflect?/critical-section",
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"bevy_app/critical-section",
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]
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[dependencies]
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# bevy
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bevy_app = { path = "../bevy_app", version = "0.16.0-dev", default-features = false }
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bevy_ecs = { path = "../bevy_ecs", version = "0.16.0-dev", default-features = false }
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bevy_reflect = { path = "../bevy_reflect", version = "0.16.0-dev", default-features = false, optional = true }
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bevy_platform_support = { path = "../bevy_platform_support", version = "0.16.0-dev", default-features = false }
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# other
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crossbeam-channel = { version = "0.5.0", default-features = false, features = [
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"std",
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], optional = true }
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serde = { version = "1", features = [
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"derive",
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], default-features = false, optional = true }
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log = { version = "0.4", default-features = false }
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[lints]
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workspace = true
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[package.metadata.docs.rs]
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rustdoc-args = ["-Zunstable-options", "--generate-link-to-definition"]
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all-features = true
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