--- a/gcc/lto-section-out.c	Fri Oct 27 22:46:09 2017 +0900
+++ b/gcc/lto-section-out.c	Thu Oct 25 07:37:49 2018 +0900
@@ -1,6 +1,6 @@
 /* Functions for writing LTO sections.
 
-   Copyright (C) 2009-2017 Free Software Foundation, Inc.
+   Copyright (C) 2009-2018 Free Software Foundation, Inc.
    Contributed by Kenneth Zadeck <zadeck@naturalbridge.com>
 
 This file is part of GCC.
@@ -30,6 +30,7 @@
 #include "data-streamer.h"
 #include "langhooks.h"
 #include "lto-compress.h"
+#include "print-tree.h"
 
 static vec<lto_out_decl_state_ptr> decl_state_stack;
 
@@ -66,6 +67,15 @@
 {
   lang_hooks.lto.begin_section (name);
 
+  if (streamer_dump_file)
+    {
+      if (flag_dump_unnumbered || flag_dump_noaddr)
+	  fprintf (streamer_dump_file, "Creating %ssection\n",
+		   compress ? "compressed " : "");
+	else
+	  fprintf (streamer_dump_file, "Creating %ssection %s\n",
+		   compress ? "compressed " : "", name);
+    }
   gcc_assert (compression_stream == NULL);
   if (compress)
     compression_stream = lto_start_compression (lto_append_data, NULL);
@@ -158,6 +168,12 @@
   if (!existed_p)
     {
       index = encoder->trees.length ();
+      if (streamer_dump_file)
+	{
+	  print_node_brief (streamer_dump_file, "    Encoding indexable ",
+			    name, 4);
+	  fprintf (streamer_dump_file, "  as %i \n", index);
+	}
       encoder->trees.safe_push (name);
       new_entry_p = TRUE;
     }