[PATCH x11proto] Xfuncproto: add _X_NONNULL

[Jeff Smith]

Signed-off-by: Jeff Smith <whydoubt at yahoo.com>
---
 Xfuncproto.h.in |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/Xfuncproto.h.in b/Xfuncproto.h.in
index 96a585c..be3e052 100644
--- a/Xfuncproto.h.in
+++ b/Xfuncproto.h.in
@@ -123,4 +123,10 @@ in this Software without prior written authorization from The Open Group.
 # define _X_NORETURN
 #endif /* GNUC  */
 
+#if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 303)
+# define _X_NONNULL(x)  __attribute__((nonnull(x)))
+#else /* not gcc >= 3.3 */
+# define _X_NONNULL
+#endif
+
 #endif /* _XFUNCPROTO_H_ */
-- 
1.6.0.6

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