/* Determine alignment of types.
- Copyright (C) 2003-2004, 2006, 2009-2010 Free Software Foundation, Inc.
+ Copyright (C) 2003-2004, 2006, 2009-2012 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
#include <stddef.h>
-/* Determine the alignment of a structure slot (field) of a given type,
+/* alignof_slot (TYPE)
+ Determine the alignment of a structure slot (field) of a given type,
at compile time. Note that the result depends on the ABI.
+ This is the same as alignof (TYPE) and _Alignof (TYPE), defined in
+ <stdalign.h> if __alignof_is_defined is 1.
Note: The result cannot be used as a value for an 'enum' constant,
due to bugs in HP-UX 10.20 cc and AIX 3.2.5 xlc. */
#if defined __cplusplus
# define alignof_slot(type) offsetof (struct { char __slot1; type __slot2; }, __slot2)
#endif
-/* Determine the good alignment of a object of the given type at compile time.
+/* alignof_type (TYPE)
+ Determine the good alignment of an object of the given type at compile time.
Note that this is not necessarily the same as alignof_slot(type).
For example, with GNU C on x86 platforms: alignof_type(double) = 8, but
- when -malign-double is not specified: alignof_slot(double) = 4,
# define alignof_type alignof_slot
#endif
-/* alignof is an alias for alignof_slot semantics, since that's what most
- callers need.
- Note: The result cannot be used as a value for an 'enum' constant,
- due to bugs in HP-UX 10.20 cc and AIX 3.2.5 xlc. */
-#define alignof alignof_slot
-
#endif /* _ALIGNOF_H */