--- gcc/config/xm-iris.h	2018/04/24 16:53:27	1.1
+++ gcc/config/xm-iris.h	2018/04/24 16:57:02	1.1.1.2
@@ -5,7 +5,3 @@
 #define bcopy(a,b,c) memcpy (b,a,c)
 #define bzero(a,b) memset (a,0,b)
 #define bcmp(a,b,c) memcmp (a,b,c)
-
-#ifdef __GNUC__
-#define alloca(n) __builtin_alloca(n)
-#endif