--- gcc/config/xm-i386.h	2018/04/24 16:53:27	1.1
+++ gcc/config/xm-i386.h	2018/04/24 16:55:06	1.1.1.2
@@ -36,3 +36,7 @@ the Free Software Foundation, 675 Mass A
    tm.h is a symbolic link to the actual target specific file.   */
 
 #include "tm.h"
+
+#ifdef __GNUC__
+#define alloca(n) __builtin_alloca(n)
+#endif