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-rw-r--r--lib/stddef.in.h56
1 files changed, 40 insertions, 16 deletions
diff --git a/lib/stddef.in.h b/lib/stddef.in.h
index 204c4bcf0..927bc2db4 100644
--- a/lib/stddef.in.h
+++ b/lib/stddef.in.h
@@ -1,6 +1,6 @@
/* A substitute for POSIX 2008 <stddef.h>, for platforms that have issues.
- Copyright (C) 2009-2014 Free Software Foundation, Inc.
+ Copyright (C) 2009-2016 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
@@ -39,7 +39,6 @@
# if !(defined _@GUARD_PREFIX@_STDDEF_H && defined _GL_STDDEF_WINT_T)
# ifdef __need_wint_t
-# undef _@GUARD_PREFIX@_STDDEF_H
# define _GL_STDDEF_WINT_T
# endif
# @INCLUDE_NEXT@ @NEXT_STDDEF_H@
@@ -54,33 +53,58 @@
# @INCLUDE_NEXT@ @NEXT_STDDEF_H@
-# ifndef _@GUARD_PREFIX@_STDDEF_H
-# define _@GUARD_PREFIX@_STDDEF_H
-
/* On NetBSD 5.0, the definition of NULL lacks proper parentheses. */
-#if @REPLACE_NULL@
-# undef NULL
-# ifdef __cplusplus
+# 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
+# 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
+# define NULL __null
+# else
+# define NULL 0L
+# endif
+# else
+# define NULL ((void *) 0)
+# endif
# 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 */