1 files changed, 25 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/atomic_flag_clear.c b/contrib/llvm-project/compiler-rt/lib/builtins/atomic_flag_clear.c
new file mode 100644
index 000000000000..983e5d7f076b
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/atomic_flag_clear.c
@@ -0,0 +1,25 @@
+//===-- atomic_flag_clear.c -----------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements atomic_flag_clear from C11's stdatomic.h.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __has_include
+#define __has_include(inc) 0
+#endif
+
+#if __has_include(<stdatomic.h>)
+
+#include <stdatomic.h>
+#undef atomic_flag_clear
+void atomic_flag_clear(volatile atomic_flag *object) {
+  __c11_atomic_store(&(object)->_Value, 0, __ATOMIC_SEQ_CST);
+}
+
+#endif