Inline start_thread into its callers.

src/libstd/sys/cloudabi/thread.rs

@@ -4,8 +4,8 @@ use crate::io;
 use crate::mem;
 use crate::ptr;
 use crate::sys::cloudabi::abi;
+use crate::sys::stack_overflow;
 use crate::sys::time::checked_dur2intervals;
-use crate::sys_common::thread::*;
 use crate::time::Duration;
 
 pub const DEFAULT_MIN_STACK_SIZE: usize = 2 * 1024 * 1024;
@@ -49,7 +49,11 @@ impl Thread {
 
         extern "C" fn thread_start(main: *mut libc::c_void) -> *mut libc::c_void {
             unsafe {
-                start_thread(main as *mut u8);
+                // Next, set up our stack overflow handler which may get triggered if we run
+                // out of stack.
+                let _handler = stack_overflow::Handler::new();
+                // Finally, let's run some code.
+                Box::from_raw(main as *mut Box<dyn FnOnce()>)();
             }
             ptr::null_mut()
         }

src/libstd/sys/hermit/thread.rs

@@ -5,11 +5,10 @@ use crate::fmt;
 use crate::io;
 use crate::mem;
 use crate::sys::hermit::abi;
+use crate::sys::stack_overflow;
 use crate::time::Duration;
 use core::u32;
 
-use crate::sys_common::thread::*;
-
 pub type Tid = abi::Tid;
 
 /// Priority of a task
@@ -70,7 +69,11 @@ impl Thread {
 
         extern "C" fn thread_start(main: usize) {
             unsafe {
-                start_thread(main as *mut u8);
+                // Next, set up our stack overflow handler which may get triggered if we run
+                // out of stack.
+                let _handler = stack_overflow::Handler::new();
+                // Finally, let's run some code.
+                Box::from_raw(main as *mut Box<dyn FnOnce()>)();
             }
         }
     }

src/libstd/sys/unix/thread.rs

@@ -3,11 +3,9 @@ use crate::ffi::CStr;
 use crate::io;
 use crate::mem;
 use crate::ptr;
-use crate::sys::os;
+use crate::sys::{os, stack_overflow};
 use crate::time::Duration;
 
-use crate::sys_common::thread::*;
-
 #[cfg(not(target_os = "l4re"))]
 pub const DEFAULT_MIN_STACK_SIZE: usize = 2 * 1024 * 1024;
 #[cfg(target_os = "l4re")]
@@ -84,7 +82,11 @@ impl Thread {
 
         extern "C" fn thread_start(main: *mut libc::c_void) -> *mut libc::c_void {
             unsafe {
-                start_thread(main as *mut u8);
+                // Next, set up our stack overflow handler which may get triggered if we run
+                // out of stack.
+                let _handler = stack_overflow::Handler::new();
+                // Finally, let's run some code.
+                Box::from_raw(main as *mut Box<dyn FnOnce()>)();
             }
             ptr::null_mut()
         }

src/libstd/sys/vxworks/thread.rs

@@ -3,11 +3,9 @@ use crate::ffi::CStr;
 use crate::io;
 use crate::mem;
 use crate::ptr;
-use crate::sys::os;
+use crate::sys::{os, stack_overflow};
 use crate::time::Duration;
 
-use crate::sys_common::thread::*;
-
 pub const DEFAULT_MIN_STACK_SIZE: usize = 0x40000; // 256K
 
 pub struct Thread {
@@ -72,7 +70,11 @@ impl Thread {
 
         extern "C" fn thread_start(main: *mut libc::c_void) -> *mut libc::c_void {
             unsafe {
-                start_thread(main as *mut u8);
+                // Next, set up our stack overflow handler which may get triggered if we run
+                // out of stack.
+                let _handler = stack_overflow::Handler::new();
+                // Finally, let's run some code.
+                Box::from_raw(main as *mut Box<dyn FnOnce()>)();
             }
             ptr::null_mut()
         }

src/libstd/sys/windows/thread.rs

@@ -4,7 +4,7 @@ use crate::mem;
 use crate::ptr;
 use crate::sys::c;
 use crate::sys::handle::Handle;
-use crate::sys_common::thread::*;
+use crate::sys::stack_overflow;
 use crate::time::Duration;
 
 use libc::c_void;
@@ -50,7 +50,11 @@ impl Thread {
 
         extern "system" fn thread_start(main: *mut c_void) -> c::DWORD {
             unsafe {
-                start_thread(main as *mut u8);
+                // Next, set up our stack overflow handler which may get triggered if we run
+                // out of stack.
+                let _handler = stack_overflow::Handler::new();
+                // Finally, let's run some code.
+                Box::from_raw(main as *mut Box<dyn FnOnce()>)();
             }
             0
         }

src/libstd/sys_common/thread.rs

@@ -1,18 +1,7 @@
 use crate::env;
 use crate::sync::atomic::{self, Ordering};
-use crate::sys::stack_overflow;
 use crate::sys::thread as imp;
 
-#[allow(dead_code)]
-pub unsafe fn start_thread(main: *mut u8) {
-    // Next, set up our stack overflow handler which may get triggered if we run
-    // out of stack.
-    let _handler = stack_overflow::Handler::new();
-
-    // Finally, let's run some code.
-    Box::from_raw(main as *mut Box<dyn FnOnce()>)()
-}
-
 pub fn min_stack() -> usize {
     static MIN: atomic::AtomicUsize = atomic::AtomicUsize::new(0);
     match MIN.load(Ordering::SeqCst) {