Index: include/isc/platform.h
===================================================================
RCS file: /cvsroot/src/external/mpl/bind/include/isc/platform.h,v
retrieving revision 1.2
diff -p -u -r1.2 platform.h
--- include/isc/platform.h	12 Aug 2018 20:16:10 -0000	1.2
+++ include/isc/platform.h	13 Aug 2018 07:16:16 -0000
@@ -346,7 +346,11 @@
 /*
  * Define with the busy wait nop asm or function call.
  */
+#if defined(__x86_64__) || defined(__i386__)
 #define ISC_PLATFORM_BUSYWAITNOP asm("rep; nop")
+#else
+#undef ISC_PLATFORM_BUSYWAITNOP
+#endif
 
 /*
  * Define if the platform has <strings.h>.