Author: emaste
Date: Mon Feb 8 18:37:10 2010
New Revision: 203674
URL: http://svn.freebsd.org/changeset/base/203674
Log:
MFC r162488:
Use __builtin_offsetof for GCC 4.1.
Submitted by: Ryan Stone
Modified:
stable/6/sys/sys/cdefs.h
Directory Properties:
stable/6/sys/ (props changed)
stable/6/sys/contrib/pf/ (props changed)
stable/6/sys/dev/cxgb/ (props changed)
Modified: stable/6/sys/sys/cdefs.h
==============================================================================
--- stable/6/sys/sys/cdefs.h Mon Feb 8 18:16:59 2010 (r203673)
+++ stable/6/sys/sys/cdefs.h Mon Feb 8 18:37:10 2010 (r203674)
@@ -304,6 +304,9 @@
* We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
* require it.
*/
+#if __GNUC_PREREQ__(4, 1)
+#define __offsetof(type, field) __builtin_offsetof(type, field)
+#else
#ifndef __cplusplus
#define __offsetof(type, field) ((size_t)(&((type *)0)->field))
#else
@@ -312,6 +315,7 @@
(&reinterpret_cast <const volatile char &> \
(static_cast<type *> (0)->field))))
#endif
+#endif
#define __rangeof(type, start, end) \
(__offsetof(type, end) - __offsetof(type, start))
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