1 files changed, 25 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/atomic_flag_test_and_set.c b/contrib/llvm-project/compiler-rt/lib/builtins/atomic_flag_test_and_set.c
new file mode 100644
index 000000000000..ee22b08b5669
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/atomic_flag_test_and_set.c
@@ -0,0 +1,25 @@
+//===-- atomic_flag_test_and_set.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_test_and_set 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_test_and_set
+_Bool atomic_flag_test_and_set(volatile atomic_flag *object) {
+  return __c11_atomic_exchange(&(object)->_Value, 1, __ATOMIC_SEQ_CST);
+}
+
+#endif