bevy/crates
Zachary Harrold 6963b58eba
Modify derive_label to support no_std environments (#15465)
# Objective

- Contributes to #15460

## Solution

- Wrap `derive_label` `quote!` in an anonymous constant which contains
an `extern crate alloc` statement, allowing use of the `alloc` namespace
even when a user has not brought in the crate themselves.

## Testing

- CI passed locally.

## Notes

We can't generate code that uses `::std::boxed::Box` in `no_std`
environments, but we also can't rely on `::alloc::boxed::Box` either,
since the user might not have declared `extern crate alloc`. To resolve
this, the generated code is wrapped in an anonymous constant which
contains the `extern crate alloc` invocation.

This does mean the macro is no longer hygienic against cases where the
user provides an alternate `alloc` crate, however I believe this is an
acceptable compromise.

Additionally, this crate itself doesn't need to be `no_std`, it just
needs to _generate_ `no_std` compatible code.

---------

Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
2024-09-27 20:23:26 +00:00
..
bevy_a11y Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_animation Include AnimationTarget directly in the animation query rather than reading it through the EntityMut (#15413) 2024-09-27 18:18:03 +00:00
bevy_app Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_asset Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_audio Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_color Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_core Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_core_pipeline Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_derive Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_dev_tools Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_diagnostic Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_dylib Generate links to definition in source code pages on docs.rs and dev-docs.bevyengine.org (#12965) 2024-07-29 23:10:16 +00:00
bevy_ecs Reduce memory usage in component fetches and change detection filters (#15283) 2024-09-27 14:06:40 +00:00
bevy_encase_derive Update `glam to 0.29, encase` to 0.10. (#15249) 2024-09-23 19:44:02 +00:00
bevy_gilrs Implement gamepads as entities (#12770) 2024-09-27 20:07:20 +00:00
bevy_gizmos Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_gltf Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_hierarchy Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_input Implement gamepads as entities (#12770) 2024-09-27 20:07:20 +00:00
bevy_internal Initial implementation of the Bevy Remote Protocol (Adopted) (#14880) 2024-09-23 18:36:16 +00:00
bevy_log Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_macro_utils Modify derive_label to support no_std environments (#15465) 2024-09-27 20:23:26 +00:00
bevy_math Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_mikktspace Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_pbr Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_picking Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_ptr Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_reflect Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_remote Refactor BRP to allow for 3rd-party transports (#15438) 2024-09-27 20:09:46 +00:00
bevy_render Migrate visibility to required components (#15474) 2024-09-27 19:06:16 +00:00
bevy_scene Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_sprite Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_state Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_tasks Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_text Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_time Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_transform Migrate visibility to required components (#15474) 2024-09-27 19:06:16 +00:00
bevy_ui Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_utils Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_window Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
bevy_winit Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00