2 //===----------------------------------------------------------------------===//
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
8 //===----------------------------------------------------------------------===//
10 #ifndef _LIBCPP_CSTDALIGN
11 #define _LIBCPP_CSTDALIGN
25 // <stdalign.h> is not provided by libc++
26 #if __has_include(<stdalign.h>)
27 # include <stdalign.h>
28 # ifdef _LIBCPP_STDALIGN_H
29 # error "If libc++ starts defining <stdalign.h>, the __has_include check should move to libc++'s <stdalign.h>"
33 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
34 # pragma GCC system_header
37 #undef __alignas_is_defined
38 #define __alignas_is_defined 1
40 #undef __alignof_is_defined
41 #define __alignof_is_defined 1
43 #if _LIBCPP_STD_VER >= 20
45 using __standard_header_cstdalign _LIBCPP_DEPRECATED_("removed in C++20.") = void;
46 using __use_standard_header_cstdalign = __standard_header_cstdalign;
48 #elif _LIBCPP_STD_VER >= 17
50 using __standard_header_cstdalign _LIBCPP_DEPRECATED = void;
51 using __use_standard_header_cstdalign = __standard_header_cstdalign;
55 #endif // _LIBCPP_CSTDALIGN