11 files changed, 19 insertions, 15 deletions
diff --git a/library/std/src/sys/unsupported/alloc.rs b/library/std/src/sys/unsupported/alloc.rs
index 8d5d0a2f5..d715ae454 100644
--- a/library/std/src/sys/unsupported/alloc.rs
+++ b/library/std/src/sys/unsupported/alloc.rs
@@ -1,15 +1,16 @@
 use crate::alloc::{GlobalAlloc, Layout, System};
+use crate::ptr::null_mut;
 
 #[stable(feature = "alloc_system_type", since = "1.28.0")]
 unsafe impl GlobalAlloc for System {
     #[inline]
     unsafe fn alloc(&self, _layout: Layout) -> *mut u8 {
-        0 as *mut u8
+        null_mut()
     }
 
     #[inline]
     unsafe fn alloc_zeroed(&self, _layout: Layout) -> *mut u8 {
-        0 as *mut u8
+        null_mut()
     }
 
     #[inline]
@@ -17,6 +18,6 @@ unsafe impl GlobalAlloc for System {
 
     #[inline]
     unsafe fn realloc(&self, _ptr: *mut u8, _layout: Layout, _new_size: usize) -> *mut u8 {
-        0 as *mut u8
+        null_mut()
     }
 }
diff --git a/library/std/src/sys/unsupported/common.rs b/library/std/src/sys/unsupported/common.rs
index 4c9ade4a8..5cd9e57de 100644
--- a/library/std/src/sys/unsupported/common.rs
+++ b/library/std/src/sys/unsupported/common.rs
@@ -6,7 +6,7 @@ pub mod memchr {
 
 // SAFETY: must be called only once during runtime initialization.
 // NOTE: this is not guaranteed to run, for example when Rust code is called externally.
-pub unsafe fn init(_argc: isize, _argv: *const *const u8) {}
+pub unsafe fn init(_argc: isize, _argv: *const *const u8, _sigpipe: u8) {}
 
 // SAFETY: must be called only once during runtime cleanup.
 // NOTE: this is not guaranteed to run, for example when the program aborts.
diff --git a/library/std/src/sys/unsupported/fs.rs b/library/std/src/sys/unsupported/fs.rs
index 0e1a6257e..6ac1b5d2b 100644
--- a/library/std/src/sys/unsupported/fs.rs
+++ b/library/std/src/sys/unsupported/fs.rs
@@ -1,7 +1,7 @@
 use crate::ffi::OsString;
 use crate::fmt;
 use crate::hash::{Hash, Hasher};
-use crate::io::{self, IoSlice, IoSliceMut, ReadBuf, SeekFrom};
+use crate::io::{self, BorrowedCursor, IoSlice, IoSliceMut, SeekFrom};
 use crate::path::{Path, PathBuf};
 use crate::sys::time::SystemTime;
 use crate::sys::unsupported;
@@ -214,7 +214,7 @@ impl File {
         self.0
     }
 
-    pub fn read_buf(&self, _buf: &mut ReadBuf<'_>) -> io::Result<()> {
+    pub fn read_buf(&self, _cursor: BorrowedCursor<'_>) -> io::Result<()> {
         self.0
     }
 
diff --git a/library/std/src/sys/unsupported/io.rs b/library/std/src/sys/unsupported/io.rs
index d5f475b43..82610ffab 100644
--- a/library/std/src/sys/unsupported/io.rs
+++ b/library/std/src/sys/unsupported/io.rs
@@ -45,3 +45,7 @@ impl<'a> IoSliceMut<'a> {
         self.0
     }
 }
+
+pub fn is_terminal<T>(_: &T) -> bool {
+    false
+}
diff --git a/library/std/src/sys/unsupported/locks/condvar.rs b/library/std/src/sys/unsupported/locks/condvar.rs
index e703fd0d2..527a26a12 100644
--- a/library/std/src/sys/unsupported/locks/condvar.rs
+++ b/library/std/src/sys/unsupported/locks/condvar.rs
@@ -7,6 +7,7 @@ pub type MovableCondvar = Condvar;
 
 impl Condvar {
     #[inline]
+    #[rustc_const_stable(feature = "const_locks", since = "1.63.0")]
     pub const fn new() -> Condvar {
         Condvar {}
     }
diff --git a/library/std/src/sys/unsupported/locks/mod.rs b/library/std/src/sys/unsupported/locks/mod.rs
index d412ff152..602a2d623 100644
--- a/library/std/src/sys/unsupported/locks/mod.rs
+++ b/library/std/src/sys/unsupported/locks/mod.rs
@@ -3,4 +3,4 @@ mod mutex;
 mod rwlock;
 pub use condvar::{Condvar, MovableCondvar};
 pub use mutex::{MovableMutex, Mutex};
-pub use rwlock::{MovableRwLock, RwLock};
+pub use rwlock::MovableRwLock;
diff --git a/library/std/src/sys/unsupported/locks/mutex.rs b/library/std/src/sys/unsupported/locks/mutex.rs
index d7cb12e0c..87ea475c6 100644
--- a/library/std/src/sys/unsupported/locks/mutex.rs
+++ b/library/std/src/sys/unsupported/locks/mutex.rs
@@ -12,14 +12,12 @@ unsafe impl Sync for Mutex {} // no threads on this platform
 
 impl Mutex {
     #[inline]
+    #[rustc_const_stable(feature = "const_locks", since = "1.63.0")]
     pub const fn new() -> Mutex {
         Mutex { locked: Cell::new(false) }
     }
 
     #[inline]
-    pub unsafe fn init(&mut self) {}
-
-    #[inline]
     pub unsafe fn lock(&self) {
         assert_eq!(self.locked.replace(true), false, "cannot recursively acquire mutex");
     }
diff --git a/library/std/src/sys/unsupported/locks/rwlock.rs b/library/std/src/sys/unsupported/locks/rwlock.rs
index aca5fb715..5292691b9 100644
--- a/library/std/src/sys/unsupported/locks/rwlock.rs
+++ b/library/std/src/sys/unsupported/locks/rwlock.rs
@@ -12,6 +12,7 @@ unsafe impl Sync for RwLock {} // no threads on this platform
 
 impl RwLock {
     #[inline]
+    #[rustc_const_stable(feature = "const_locks", since = "1.63.0")]
     pub const fn new() -> RwLock {
         RwLock { mode: Cell::new(0) }
     }
diff --git a/library/std/src/sys/unsupported/process.rs b/library/std/src/sys/unsupported/process.rs
index 42a1ff730..633f17c05 100644
--- a/library/std/src/sys/unsupported/process.rs
+++ b/library/std/src/sys/unsupported/process.rs
@@ -200,6 +200,9 @@ impl<'a> Iterator for CommandArgs<'a> {
     fn next(&mut self) -> Option<&'a OsStr> {
         None
     }
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        (0, Some(0))
+    }
 }
 
 impl<'a> ExactSizeIterator for CommandArgs<'a> {}
diff --git a/library/std/src/sys/unsupported/thread_local_dtor.rs b/library/std/src/sys/unsupported/thread_local_dtor.rs
index 85d660983..84660ea58 100644
--- a/library/std/src/sys/unsupported/thread_local_dtor.rs
+++ b/library/std/src/sys/unsupported/thread_local_dtor.rs
@@ -1,5 +1,6 @@
 #![unstable(feature = "thread_local_internals", issue = "none")]
 
+#[cfg_attr(target_family = "wasm", allow(unused))] // unused on wasm32-unknown-unknown
 pub unsafe fn register_dtor(_t: *mut u8, _dtor: unsafe extern "C" fn(*mut u8)) {
     // FIXME: right now there is no concept of "thread exit", but this is likely
     // going to show up at some point in the form of an exported symbol that the
diff --git a/library/std/src/sys/unsupported/thread_local_key.rs b/library/std/src/sys/unsupported/thread_local_key.rs
index c31b61cbf..b6e5e4cd2 100644
--- a/library/std/src/sys/unsupported/thread_local_key.rs
+++ b/library/std/src/sys/unsupported/thread_local_key.rs
@@ -19,8 +19,3 @@ pub unsafe fn get(_key: Key) -> *mut u8 {
 pub unsafe fn destroy(_key: Key) {
     panic!("should not be used on this target");
 }
-
-#[inline]
-pub fn requires_synchronized_create() -> bool {
-    panic!("should not be used on this target");
-}