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-rw-r--r--misc/sys/cdefs.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index c9495a479e..165a94a64b 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1992-2001, 2002, 2004, 2005, 2006, 2007, 2009
+/* Copyright (C) 1992-2001, 2002, 2004, 2005, 2006, 2007, 2009, 2011
    Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -218,6 +218,13 @@
 # define __attribute_pure__ /* Ignore */
 #endif
 
+/* This declaration tells the compiler that the value is constant.  */
+#if __GNUC_PREREQ (2,5)
+# define __attribute_const__ __attribute__ ((__const__))
+#else
+# define __attribute_const__ /* Ignore */
+#endif
+
 /* At some point during the gcc 3.1 development the `used' attribute
    for functions was introduced.  We don't want to use it unconditionally
    (although this would be possible) since it generates warnings.  */