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-/* A substitute for ISO C11 <stdalign.h>.
-
- Copyright 2011-2022 Free Software Foundation, Inc.
-
- This file is free software: you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as
- published by the Free Software Foundation; either version 2.1 of the
- License, or (at your option) any later version.
-
- This file is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with this program. If not, see <https://www.gnu.org/licenses/>. */
-
-/* Written by Paul Eggert and Bruno Haible. */
-
-#ifndef _GL_STDALIGN_H
-#define _GL_STDALIGN_H
-
-/* ISO C11 <stdalign.h> for platforms that lack it.
-
- References:
- ISO C11 (latest free draft
- <http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf>)
- sections 6.5.3.4, 6.7.5, 7.15.
- C++11 (latest free draft
- <http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3242.pdf>)
- section 18.10. */
-
-/* alignof (TYPE), also known as _Alignof (TYPE), yields the alignment
- requirement of a structure member (i.e., slot or field) that is of
- type TYPE, as an integer constant expression.
-
- This differs from GCC's and clang's __alignof__ operator, which can
- yield a better-performing alignment for an object of that type. For
- example, on x86 with GCC and on Linux/x86 with clang,
- __alignof__ (double) and __alignof__ (long long) are 8, whereas
- alignof (double) and alignof (long long) are 4 unless the option
- '-malign-double' is used.
-
- The result cannot be used as a value for an 'enum' constant, if you
- want to be portable to HP-UX 10.20 cc and AIX 3.2.5 xlc. */
-
-/* FreeBSD 9.1 <sys/cdefs.h>, included by <stddef.h> and lots of other
- standard headers, defines conflicting implementations of _Alignas
- and _Alignof that are no better than ours; override them. */
-#undef _Alignas
-#undef _Alignof
-
-/* GCC releases before GCC 4.9 had a bug in _Alignof. See GCC bug 52023
- <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023>.
- clang versions < 8.0.0 have the same bug. */
-#if (!defined __STDC_VERSION__ || __STDC_VERSION__ < 201112 \
- || (defined __GNUC__ && __GNUC__ < 4 + (__GNUC_MINOR__ < 9) \
- && !defined __clang__) \
- || (defined __clang__ && __clang_major__ < 8))
-# ifdef __cplusplus
-# if (201103 <= __cplusplus || defined _MSC_VER)
-# define _Alignof(type) alignof (type)
-# else
- template <class __t> struct __alignof_helper { char __a; __t __b; };
-# define _Alignof(type) offsetof (__alignof_helper<type>, __b)
-# define _GL_STDALIGN_NEEDS_STDDEF 1
-# endif
-# else
-# define _Alignof(type) offsetof (struct { char __a; type __b; }, __b)
-# define _GL_STDALIGN_NEEDS_STDDEF 1
-# endif
-#endif
-#if ! (defined __cplusplus && (201103 <= __cplusplus || defined _MSC_VER))
-# define alignof _Alignof
-#endif
-#define __alignof_is_defined 1
-
-/* alignas (A), also known as _Alignas (A), aligns a variable or type
- to the alignment A, where A is an integer constant expression. For
- example:
-
- int alignas (8) foo;
- struct s { int a; int alignas (8) bar; };
-
- aligns the address of FOO and the offset of BAR to be multiples of 8.
-
- A should be a power of two that is at least the type's alignment
- and at most the implementation's alignment limit. This limit is
- 2**28 on typical GNUish hosts, and 2**13 on MSVC. To be portable
- to MSVC through at least version 10.0, A should be an integer
- constant, as MSVC does not support expressions such as 1 << 3.
- To be portable to Sun C 5.11, do not align auto variables to
- anything stricter than their default alignment.
-
- The following C11 requirements are not supported here:
-
- - If A is zero, alignas has no effect.
- - alignas can be used multiple times; the strictest one wins.
- - alignas (TYPE) is equivalent to alignas (alignof (TYPE)).
-
- */
-
-#if !defined __STDC_VERSION__ || __STDC_VERSION__ < 201112
-# if defined __cplusplus && (201103 <= __cplusplus || defined _MSC_VER)
-# define _Alignas(a) alignas (a)
-# elif (!defined __attribute__ \
- && ((defined __APPLE__ && defined __MACH__ \
- ? 4 < __GNUC__ + (1 <= __GNUC_MINOR__) \
- : __GNUC__ && !defined __ibmxl__) \
- || (4 <= __clang_major__) \
- || (__ia64 && (61200 <= __HP_cc || 61200 <= __HP_aCC)) \
- || __ICC || 0x590 <= __SUNPRO_C || 0x0600 <= __xlC__))
-# define _Alignas(a) __attribute__ ((__aligned__ (a)))
-# elif 1300 <= _MSC_VER
-# define _Alignas(a) __declspec (align (a))
-# endif
-#endif
-#if ((defined _Alignas \
- && !(defined __cplusplus && (201103 <= __cplusplus || defined _MSC_VER))) \
- || (defined __STDC_VERSION__ && 201112 <= __STDC_VERSION__))
-# define alignas _Alignas
-#endif
-#if (defined alignas \
- || (defined __cplusplus && (201103 <= __cplusplus || defined _MSC_VER)))
-# define __alignas_is_defined 1
-#endif
-
-/* Include <stddef.h> if needed for offsetof. */
-#if _GL_STDALIGN_NEEDS_STDDEF
-# include <stddef.h>
-#endif
-
-#endif /* _GL_STDALIGN_H */