diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 0afa34476c3..620c4b09eba 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2017-01-30  Martin Liska  <mliska@suse.cz>
+
+	PR bootstrap/78985
+	* config/aarch64/cortex-a57-fma-steering.c (func_fma_steering::analyze):
+	Initialize variables with NULL value.
+
 2017-01-30  Richard Earnshaw  <rearnsh@arm.com>
 
 	PR target/79260
diff --git a/gcc/config/aarch64/cortex-a57-fma-steering.c b/gcc/config/aarch64/cortex-a57-fma-steering.c
index a5acd71d784..4a3887984b4 100644
--- a/gcc/config/aarch64/cortex-a57-fma-steering.c
+++ b/gcc/config/aarch64/cortex-a57-fma-steering.c
@@ -923,10 +923,10 @@ func_fma_steering::analyze ()
       FOR_BB_INSNS (bb, insn)
 	{
 	  operand_rr_info *dest_op_info;
-	  struct du_chain *chain;
+	  struct du_chain *chain = NULL;
 	  unsigned dest_regno;
-	  fma_forest *forest;
-	  du_head_p head;
+	  fma_forest *forest = NULL;
+	  du_head_p head = NULL;
 	  int i;
 
 	  if (!is_fmul_fmac_insn (insn, true))