av_builtin_constant_p()

Originally committed as revision 22770 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavutil/attributes.h

@@ -104,4 +104,10 @@
 #endif
 #endif
 
+#ifdef __GNUC__
+#    define av_builtin_constant_p __builtin_constant_p
+#else
+#    define av_builtin_constant_p(x) 0
+#endif
+
 #endif /* AVUTIL_ATTRIBUTES_H */