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authorLudovic Courtès <ludo@gnu.org>2009-11-15 20:16:40 +0100
committerLudovic Courtès <ludo@gnu.org>2009-11-16 09:23:46 +0100
commit8912421cf3829a4fd65877fd1255125c191f6f89 (patch)
tree6b89fecf0738a1f80792bbe7453730f7882f1d54 /lib/alignof.h
parent3fe87cf7aff396d7bd993aa009f48eb8afd6c1cd (diff)
downloadguile-8912421cf3829a4fd65877fd1255125c191f6f89.tar.gz
Use Gnulib's `inet_ntop' and `inet_pton' modules.
* m4/gnulib-cache.m4: Add `inet_ntop' and `inet_pton'. * configure.ac: Don't check for `inet_ntop' and `inet_pton'. * libguile/socket.c (scm_inet_pton, scm_inet_ntop): Compile regardless of `HAVE_INET_PTON' and `HAVE_INET_NTOP' respectively. * libguile/filesys.c: Use <stdlib.h> instead of <canonicalize.h>.
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+/* Determine alignment of types.
+ Copyright (C) 2003-2004, 2006, 2009 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
+ the Free Software Foundation; either version 2, 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 Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+#ifndef _ALIGNOF_H
+#define _ALIGNOF_H
+
+#include <stddef.h>
+
+/* Determine the alignment of a structure slot (field) of a given type,
+ at compile time. Note that the result depends on the ABI.
+ 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
+ template <class type> struct alignof_helper { char __slot1; type __slot2; };
+# define alignof_slot(type) offsetof (alignof_helper<type>, __slot2)
+#else
+# 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.
+ 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,
+ - when -malign-double is specified: alignof_slot(double) = 8.
+ 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 __GNUC__
+# define alignof_type __alignof__
+#else
+# 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 */