Rollup merge of rust-lang#45882 - japaric:gh45802, r=kennytm

kennytm · web-flow · commit 20e11db8f77b · 2017-11-10T17:07:09.000+08:00
fix core for targets with max-atomic-width = 0 closes rust-lang#45802 cc @kennytm
diff --git a/src/libcore/sync/atomic.rs b/src/libcore/sync/atomic.rs
@@ -927,6 +927,7 @@ impl<T> AtomicPtr<T> {
     }
 }
 
+#[cfg(target_has_atomic = "ptr")]
 #[stable(feature = "atomic_from", since = "1.23.0")]
 impl<T> From<*mut T> for AtomicPtr<T> {
     #[inline]

Original file line number	Diff line number	Diff line change
`@@ -927,6 +927,7 @@ impl<T> AtomicPtr<T> {`
`927`	`927`	`}`
`928`	`928`	`}`
`929`	`929`
	`930`	`+#[cfg(target_has_atomic = "ptr")]`
`930`	`931`	`#[stable(feature = "atomic_from", since = "1.23.0")]`
`931`	`932`	`impl<T> From<*mut T> for AtomicPtr<T> {`
`932`	`933`	`#[inline]`