Fix no_std build

Author: Nemo157

futures-util/src/lib.rs

@@ -1,8 +1,8 @@
 //! Combinators and utilities for working with `Future`s, `Stream`s, `Sink`s,
 //! and the `AsyncRead` and `AsyncWrite` traits.
 
-#![feature(futures_api, box_into_pin)]
-#![cfg_attr(feature = "std", feature(async_await, await_macro))]
+#![feature(futures_api)]
+#![cfg_attr(feature = "std", feature(async_await, await_macro, box_into_pin))]
 #![cfg_attr(feature = "cfg-target-has-atomic", feature(cfg_target_has_atomic))]
 
 #![cfg_attr(not(feature = "std"), no_std)]

futures-util/src/task/mod.rs

@@ -6,7 +6,9 @@ mod arc_wake;
 pub use self::arc_wake::ArcWake;
 
 mod noop_waker;
-pub use self::noop_waker::{noop_waker, noop_waker_ref};
+pub use self::noop_waker::noop_waker;
+#[cfg(feature = "std")]
+pub use self::noop_waker::noop_waker_ref;
 
 mod spawn;
 pub use self::spawn::{SpawnExt, LocalSpawnExt};

futures-util/src/task/noop_waker.rs

@@ -1,6 +1,7 @@
 //! Utilities for creating zero-cost wakers that don't do anything.
 use futures_core::task::{RawWaker, RawWakerVTable, Waker};
 use core::ptr::null;
+#[cfg(feature = "std")]
 use core::cell::UnsafeCell;
 
 unsafe fn noop_clone(_data: *const()) -> RawWaker {
@@ -52,6 +53,7 @@ pub fn noop_waker() -> Waker {
 /// lw.wake();
 /// ```
 #[inline]
+#[cfg(feature = "std")]
 pub fn noop_waker_ref() -> &'static Waker {
     thread_local! {
         static NOOP_WAKER_INSTANCE: UnsafeCell<Waker> =

futures/src/lib.rs

@@ -207,6 +207,10 @@ pub mod future {
         AndThen, ErrInto, FlattenSink, IntoFuture, MapErr, MapOk, OrElse,
         UnwrapOrElse,
         TryJoin, TryJoin3, TryJoin4, TryJoin5,
+    };
+
+    #[cfg(feature = "std")]
+    pub use futures_util::try_future::{
         try_join_all, TryJoinAll,
     };
 }
@@ -364,18 +368,17 @@ pub mod task {
         Waker, RawWaker, RawWakerVTable
     };
 
+    pub use futures_util::task::noop_waker;
+
     #[cfg(feature = "std")]
     pub use futures_util::task::{
         WakerRef, waker_ref, ArcWake,
         SpawnExt, LocalSpawnExt,
-    };
-
-    pub use futures_util::task::{
-        noop_waker, noop_waker_ref,
+        noop_waker_ref,
     };
 
     #[cfg_attr(
-        feature = "target-has-atomic",
+        feature = "cfg-target-has-atomic",
         cfg(all(target_has_atomic = "cas", target_has_atomic = "ptr"))
     )]
     pub use futures_util::task::AtomicWaker;