--- gcc/config/x-rs6000	2018/04/24 17:51:33	1.1.1.1
+++ gcc/config/x-rs6000	2018/04/24 17:54:04	1.1.1.2
@@ -9,4 +9,7 @@ ALLOCA_FLAGS=-c
 ALLOCA_FINISH=
 
 # For some reason, we need -lm for cc1.
-CLIB=-lm
+# We need -lld for collect2 (actually this only matters
+# for a native compiler, but this is as good a place as any
+# to define the symbol).
+CLIB=-lm -lld