1 files changed, 33 insertions, 0 deletions

diff --git a/gl/alignof.h b/gl/alignof.h
new file mode 100644
index 00000000..896382b0
--- /dev/null
+++ b/gl/alignof.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 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, 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 type at compile time.  */
+#if defined __GNUC__
+# define alignof __alignof__
+#elif defined __cplusplus
+  template <class type> struct alignof_helper { char __slot1; type __slot2; };
+# define alignof(type) offsetof (alignof_helper<type>, __slot2)
+#else
+# define alignof(type) offsetof (struct { char __slot1; type __slot2; }, __slot2)
+#endif
+
+#endif /* _ALIGNOF_H */