llvm/lib/clang/19/include/__stddef_unreachable.h

/*===---- __stddef_unreachable.h - Definition of unreachable ---------------===
 *
 * 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 __cplusplus

/*
 * When -fbuiltin-headers-in-system-modules is set this is a non-modular header
 * and needs to behave as if it was textual.
 */
#if !defined(unreachable) ||                                                   \
    (__has_feature(modules) && !__building_module(_Builtin_stddef))
#define unreachable() __builtin_unreachable()
#endif

#endif