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+/* A substitute for POSIX 2008 <stddef.h>, for platforms that have issues.
+
+ Copyright (C) 2009-2020 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3, or (at your option)
+ any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Eric Blake. */
+
+/*
+ * POSIX 2008 <stddef.h> for platforms that have issues.
+ * <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/stddef.h.html>
+ */
+
+#if __GNUC__ >= 3
+@PRAGMA_SYSTEM_HEADER@
+#endif
+@PRAGMA_COLUMNS@
+
+#if defined __need_wchar_t || defined __need_size_t \
+ || defined __need_ptrdiff_t || defined __need_NULL \
+ || defined __need_wint_t
+/* Special invocation convention inside gcc header files. In
+ particular, gcc provides a version of <stddef.h> that blindly
+ redefines NULL even when __need_wint_t was defined, even though
+ wint_t is not normally provided by <stddef.h>. Hence, we must
+ remember if special invocation has ever been used to obtain wint_t,
+ in which case we need to clean up NULL yet again. */
+
+# if !(defined _@GUARD_PREFIX@_STDDEF_H && defined _GL_STDDEF_WINT_T)
+# ifdef __need_wint_t
+# define _GL_STDDEF_WINT_T
+# endif
+# @INCLUDE_NEXT@ @NEXT_STDDEF_H@
+# endif
+
+#else
+/* Normal invocation convention. */
+
+# ifndef _@GUARD_PREFIX@_STDDEF_H
+
+/* The include_next requires a split double-inclusion guard. */
+
+# @INCLUDE_NEXT@ @NEXT_STDDEF_H@
+
+/* On NetBSD 5.0, the definition of NULL lacks proper parentheses. */
+# if (@REPLACE_NULL@ \
+ && (!defined _@GUARD_PREFIX@_STDDEF_H || defined _GL_STDDEF_WINT_T))
+# undef NULL
+# ifdef __cplusplus
+ /* ISO C++ says that the macro NULL must expand to an integer constant
+ expression, hence '((void *) 0)' is not allowed in C++. */
+# if __GNUG__ >= 3
+ /* GNU C++ has a __null macro that behaves like an integer ('int' or
+ 'long') but has the same size as a pointer. Use that, to avoid
+ warnings. */
+# define NULL __null
+# else
+# define NULL 0L
+# endif
+# else
+# define NULL ((void *) 0)
+# endif
+# endif
+
+# ifndef _@GUARD_PREFIX@_STDDEF_H
+# define _@GUARD_PREFIX@_STDDEF_H
+
+/* Some platforms lack wchar_t. */
+#if !@HAVE_WCHAR_T@
+# define wchar_t int
+#endif
+
+/* Some platforms lack max_align_t. The check for _GCC_MAX_ALIGN_T is
+ a hack in case the configure-time test was done with g++ even though
+ we are currently compiling with gcc.
+ On MSVC, max_align_t is defined only in C++ mode, after <cstddef> was
+ included. Its definition is good since it has an alignment of 8 (on x86
+ and x86_64). */
+#if defined _MSC_VER && defined __cplusplus
+# include <cstddef>
+#else
+# if ! (@HAVE_MAX_ALIGN_T@ || defined _GCC_MAX_ALIGN_T)
+# if !GNULIB_defined_max_align_t
+/* On the x86, the maximum storage alignment of double, long, etc. is 4,
+ but GCC's C11 ABI for x86 says that max_align_t has an alignment of 8,
+ and the C11 standard allows this. Work around this problem by
+ using __alignof__ (which returns 8 for double) rather than _Alignof
+ (which returns 4), and align each union member accordingly. */
+# ifdef __GNUC__
+# define _GL_STDDEF_ALIGNAS(type) \
+ __attribute__ ((__aligned__ (__alignof__ (type))))
+# else
+# define _GL_STDDEF_ALIGNAS(type) /* */
+# endif
+typedef union
+{
+ char *__p _GL_STDDEF_ALIGNAS (char *);
+ double __d _GL_STDDEF_ALIGNAS (double);
+ long double __ld _GL_STDDEF_ALIGNAS (long double);
+ long int __i _GL_STDDEF_ALIGNAS (long int);
+} rpl_max_align_t;
+# define max_align_t rpl_max_align_t
+# define GNULIB_defined_max_align_t 1
+# endif
+# endif
+#endif
+
+# endif /* _@GUARD_PREFIX@_STDDEF_H */
+# endif /* _@GUARD_PREFIX@_STDDEF_H */
+#endif /* __need_XXX */