--- gcc/config/rs6000-mach.h	2018/04/24 17:51:30	1.1
+++ gcc/config/rs6000-mach.h	2018/04/24 18:03:45	1.1.1.2
@@ -29,7 +29,7 @@ the Free Software Foundation, 675 Mass A
 /* Define different binder options for MACH.  */
 #undef LINK_SPEC
 #define LINK_SPEC \
- "-T0x10000000 -D0x20000000 -K -e __start \
+ "-T0x10000000 -D0x20000000 -K %{!nostdlib:%{!r*:%{!e*:-e __start}}} \
   -bnoso -berrmsg -btextro -bhalt:4 -bnodelcsect"
 
 /* MACH doesn't have atexit.  */