[#if !defined HAVE_C_ALIGNASOF && __cplusplus < 201103 && !defined alignof
# if HAVE_STDALIGN_H
# include <stdalign.h>
-# else
+# endif
+
/* ISO C23 alignas and alignof for platforms that lack it.
References:
/* 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
+# if (!defined __STDC_VERSION__ || __STDC_VERSION__ < 201112 \
+ || (defined __GNUC__ && __GNUC__ < 4 + (__GNUC_MINOR__ < 9) \
+ && !defined __clang__) \
+ || (defined __clang__ && __clang_major__ < 8))
+# undef/**/_Alignof
+# ifdef __cplusplus
+# if (201103 <= __cplusplus || defined _MSC_VER)
+# define _Alignof(type) alignof (type)
# else
-# if (defined __GNUC__ && 4 <= __GNUC__) || defined __clang__
-# define _Alignof(type) __builtin_offsetof (struct { char __a; type __b; }, __b)
-# else
-# define _Alignof(type) offsetof (struct { char __a; type __b; }, __b)
-# define _GL_STDALIGN_NEEDS_STDDEF 1
-# endif
+ 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
+# if (defined __GNUC__ && 4 <= __GNUC__) || defined __clang__
+# define _Alignof(type) __builtin_offsetof (struct { char __a; type __b; }, __b)
+# 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
+# endif
+# if ! (defined __cplusplus && (201103 <= __cplusplus || defined _MSC_VER))
+# undef/**/alignof
+# define alignof _Alignof
+# endif
/* alignas (A), also known as _Alignas (A), aligns a variable or type
to the alignment A, where A is an integer constant expression. For
- alignas (TYPE) is equivalent to alignas (alignof (TYPE)).
*/
+# if !HAVE_STDALIGN_H
# if !defined __STDC_VERSION__ || __STDC_VERSION__ < 201112
# if defined __cplusplus && (201103 <= __cplusplus || defined _MSC_VER)
# define _Alignas(a) alignas (a)
|| (defined __STDC_VERSION__ && 201112 <= __STDC_VERSION__))
# define alignas _Alignas
# endif
-# if _GL_STDALIGN_NEEDS_STDDEF
-# include <stddef.h>
-# endif
+# endif
+
+# if _GL_STDALIGN_NEEDS_STDDEF
+# include <stddef.h>
# endif
#endif])
])