api: avoid triggering the LTO bug

Author: mertcandav

api/async.hpp

@@ -45,7 +45,6 @@
 #include <cstddef>
 
 #include "types.hpp"
-#include "ptr.hpp"
 
 #define __jule_AsyncRet co_return  // Equivalent to `ret` in async functions.
 #define __jule_AsyncAwait co_await // Equivalent to `await` in async functions.
@@ -80,7 +79,11 @@ class __jule_thread;
 
 // Each OS thread executing Jule code has a TLS pointer to its associated
 // runtime thread object.
-inline thread_local __jule_Ptr<__jule_thread> __jule_ct;
+//
+// Historically, this field was a smart pointer.
+// However, due to a toolchain bug in Windows, it's supposed to be a trivial type.
+// See: https://github.com/mstorsjo/llvm-mingw/issues/541
+inline thread_local __jule_thread *__jule_ct = nullptr;
 
 // Non-templated coroutine handle used by the runtime.
 // The runtime never needs promise-type information.

std/runtime/thread.jule

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD 3-Clause
 // license that can be found in the LICENSE file.
 
-extern let mut __jule_ct: &thread
+extern let mut __jule_ct: *thread
 
 const (
 	// Thread roles.
@@ -41,13 +41,13 @@ struct thread {
 // Returns the current thread.
 // Uses the thread-local data.
 fn gett(): &thread {
-	ret extern.__jule_ct
+	ret unsafe { (&thread)(extern.__jule_ct) }
 }
 
 // Sets the current thread as t.
 // Writes to the thread-local data.
 fn sett(mut t: &thread) {
-	extern.__jule_ct = t
+	extern.__jule_ct = (*thread)(t)
 }
 
 // Pointer to the main M, the main program thread.