From ceb0d0c4f2141c6393b92a0721634b03a4c567fe Mon Sep 17 00:00:00 2001
From: Joerg Sonnenberger <joerg@dragonflybsd.org>
Date: Wed, 16 Feb 2005 21:50:00 +0000
Subject: [PATCH] Add __pure as attribute. A __pure function can only depend on
 the arguments, not on global memory. A __pure2 function in contrast just has
 to return the same value for the same arguments. It can use a hash table or
 similiar means.

For GCC before 3.0 __pure is mapped to __pure2.

Inspired-by: FreeBSD
---
 sys/sys/cdefs.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h
index a8eedfe429..21b64b253f 100644
--- a/sys/sys/cdefs.h
+++ b/sys/sys/cdefs.h
@@ -35,7 +35,7 @@
  *
  *	@(#)cdefs.h	8.8 (Berkeley) 1/9/95
  * $FreeBSD: src/sys/sys/cdefs.h,v 1.28.2.8 2002/09/18 04:05:13 mikeh Exp $
- * $DragonFly: src/sys/sys/cdefs.h,v 1.14 2005/02/04 22:28:23 joerg Exp $
+ * $DragonFly: src/sys/sys/cdefs.h,v 1.15 2005/02/16 21:50:00 joerg Exp $
  */
 
 #ifndef	_SYS_CDEFS_H_
@@ -141,6 +141,7 @@
 #ifdef lint
 
 #define __dead2
+#define	__pure
 #define __pure2
 #define __unused
 #define __packed
@@ -166,6 +167,12 @@
 #define __section(x)    __attribute__((__section__(x)))
 #endif
 
+#if __GNUC_PREREQ__(3, 0)
+#define	__pure		__attribute__((__pure__))
+#else
+#define	__pure		__pure2
+#endif
+
 #if __GNUC_PREREQ__(3, 1)
 #define __always_inline __attribute__((__always_inline__))
 #else
-- 
2.41.0