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diff --git a/gl/stddef.in.h b/gl/stddef.in.h
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--- a/gl/stddef.in.h
+++ /dev/null
@@ -1,110 +0,0 @@
-/* A substitute for POSIX 2008 <stddef.h>, for platforms that have issues.
-
- Copyright (C) 2009-2017 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 <http://www.gnu.org/licenses/>. */
-
-/* Written by Eric Blake. */
-
-/*
- * POSIX 2008 <stddef.h> for platforms that have issues.
- * <http://www.opengroup.org/susv3xbd/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. */
-#if ! (@HAVE_MAX_ALIGN_T@ || defined _GCC_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);
-} max_align_t;
-#endif
-
-# endif /* _@GUARD_PREFIX@_STDDEF_H */
-# endif /* _@GUARD_PREFIX@_STDDEF_H */
-#endif /* __need_XXX */