svn commit: r211335 - head/sys/sys

[Konstantin Belousov]

Author: kib
Date: Sun Aug 15 14:38:01 2010
New Revision: 211335
URL: http://svn.freebsd.org/changeset/base/211335

Log:
  Add convenience defines for hidden and default/exported attributes.
  
  MFC after:	2 weeks

Modified:
  head/sys/sys/cdefs.h

Modified: head/sys/sys/cdefs.h
==============================================================================
--- head/sys/sys/cdefs.h	Sun Aug 15 14:11:58 2010	(r211334)
+++ head/sys/sys/cdefs.h	Sun Aug 15 14:38:01 2010	(r211335)
@@ -305,6 +305,14 @@
 #define __predict_false(exp)    (exp)
 #endif
 
+#if __GNUC_PREREQ__(4, 2)
+#define	__hidden	__attribute((visibility("hidden")))
+#define	__exported	__attribute((visibility("default")))
+#else
+#define	__hidden
+#define	__exported
+#endif
+
 /*
  * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
  * require it.