clang/lib/Headers/__stdarg_va_copy.h

/*===---- __stdarg_va_copy.h - Definition of va_copy------------------------===
 *
 * 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
 *
 *===-----------------------------------------------------------------------===
 */

#ifndef va_copy
#define va_copy(dest, src) __builtin_va_copy(dest, src)
#endif