summaryrefslogtreecommitdiffstats
path: root/gl/alignof.h
diff options
context:
space:
mode:
Diffstat (limited to 'gl/alignof.h')
-rw-r--r--gl/alignof.h53
1 files changed, 0 insertions, 53 deletions
diff --git a/gl/alignof.h b/gl/alignof.h
deleted file mode 100644
index 240468c6..00000000
--- a/gl/alignof.h
+++ /dev/null
@@ -1,53 +0,0 @@
1/* Determine alignment of types.
2 Copyright (C) 2003-2004, 2006, 2009-2010 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3, or (at your option)
7 any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
17
18#ifndef _ALIGNOF_H
19#define _ALIGNOF_H
20
21#include <stddef.h>
22
23/* Determine the alignment of a structure slot (field) of a given type,
24 at compile time. Note that the result depends on the ABI.
25 Note: The result cannot be used as a value for an 'enum' constant,
26 due to bugs in HP-UX 10.20 cc and AIX 3.2.5 xlc. */
27#if defined __cplusplus
28 template <class type> struct alignof_helper { char __slot1; type __slot2; };
29# define alignof_slot(type) offsetof (alignof_helper<type>, __slot2)
30#else
31# define alignof_slot(type) offsetof (struct { char __slot1; type __slot2; }, __slot2)
32#endif
33
34/* Determine the good alignment of a object of the given type at compile time.
35 Note that this is not necessarily the same as alignof_slot(type).
36 For example, with GNU C on x86 platforms: alignof_type(double) = 8, but
37 - when -malign-double is not specified: alignof_slot(double) = 4,
38 - when -malign-double is specified: alignof_slot(double) = 8.
39 Note: The result cannot be used as a value for an 'enum' constant,
40 due to bugs in HP-UX 10.20 cc and AIX 3.2.5 xlc. */
41#if defined __GNUC__
42# define alignof_type __alignof__
43#else
44# define alignof_type alignof_slot
45#endif
46
47/* alignof is an alias for alignof_slot semantics, since that's what most
48 callers need.
49 Note: The result cannot be used as a value for an 'enum' constant,
50 due to bugs in HP-UX 10.20 cc and AIX 3.2.5 xlc. */
51#define alignof alignof_slot
52
53#endif /* _ALIGNOF_H */