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Use __builtin_offsetof for GCC 4.1.

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This commit is contained in:
kan 2006-09-21 01:38:58 +00:00
parent c9b2659ee8
commit a5ba0f4e08
1 changed files with 4 additions and 0 deletions

4
sys/sys/cdefs.h

@ -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))