gcov-tool: fix merge operation for summary

libgcc/ChangeLog:

	* libgcov-driver.c (merge_summary): Remove function as its name
	is misleading and doing something different.
	(dump_one_gcov): Add ATTRIBUTE_UNUSED for 2 args. Take read summary
	in gcov-tool.
	* libgcov-util.c (curr_object_summary): Remove.
	(read_gcda_file): Remove unused curr_object_summary.
	(gcov_merge): Merge summaries.
	* libgcov.h: Add summary argument for gcov_info struct.

libgcc/libgcov-driver.c

@@ -442,19 +442,6 @@ write_one_data (const struct gcov_info *gi_ptr,
   gcov_write_unsigned (0);
 }
 
-/* Helper function for merging summary.  */
-
-static void
-merge_summary (int run_counted, struct gcov_summary *summary,
-	      gcov_type run_max)
-{
-  if (!run_counted)
-    {
-      summary->runs++;
-      summary->sum_max += run_max;
-    }
-}
-
 /* Dump the coverage counts for one gcov_info object. We merge with existing
    counts when possible, to avoid growing the .da files ad infinitum. We use
    this program's checksum to make sure we only accumulate whole program
@@ -464,7 +451,8 @@ merge_summary (int run_counted, struct gcov_summary *summary,
 
 static void
 dump_one_gcov (struct gcov_info *gi_ptr, struct gcov_filename *gf,
-	       unsigned run_counted, gcov_type run_max)
+	       unsigned run_counted ATTRIBUTE_UNUSED,
+	       gcov_type run_max ATTRIBUTE_UNUSED)
 {
   struct gcov_summary summary = {};
   int error;
@@ -492,7 +480,15 @@ dump_one_gcov (struct gcov_info *gi_ptr, struct gcov_filename *gf,
 
   gcov_rewrite ();
 
-  merge_summary (run_counted, &summary, run_max);
+#if !IN_GCOV_TOOL
+  if (!run_counted)
+    {
+      summary.runs++;
+      summary.sum_max += run_max;
+    }
+#else
+  summary = gi_ptr->summary;
+#endif
 
   write_one_data (gi_ptr, &summary);
   /* fall through */

libgcc/libgcov-util.c

@@ -80,8 +80,6 @@ static int k_ctrs_mask[GCOV_COUNTERS];
 static struct gcov_ctr_info k_ctrs[GCOV_COUNTERS];
 /* Number of kind of counters that have been seen.  */
 static int k_ctrs_types;
-/* The object summary being processed.  */
-static struct gcov_summary *curr_object_summary;
 
 /* Merge functions for counters.  */
 #define DEF_GCOV_COUNTER(COUNTER, NAME, FN_TYPE) __gcov_merge ## FN_TYPE,
@@ -225,8 +223,7 @@ tag_counters (unsigned tag, unsigned length)
 static void
 tag_summary (unsigned tag ATTRIBUTE_UNUSED, unsigned length ATTRIBUTE_UNUSED)
 {
-  curr_object_summary = (gcov_summary *) xcalloc (sizeof (gcov_summary), 1);
+  gcov_read_summary (&curr_gcov_info->summary);
-  gcov_read_summary (curr_object_summary);
 }
 
 /* This function is called at the end of reading a gcda file.
@@ -300,7 +297,6 @@ read_gcda_file (const char *filename)
   obstack_init (&fn_info);
   num_fn_info = 0;
   curr_fn_info = 0;
-  curr_object_summary = NULL;
   {
     size_t len = strlen (filename) + 1;
     char *str_dup = (char*) xmalloc (len);
@@ -584,6 +580,11 @@ gcov_merge (struct gcov_info *info1, struct gcov_info *info2, int w)
   int has_mismatch = 0;
 
   gcc_assert (info2->n_functions == n_functions);
+
+  /* Merge summary.  */
+  info1->summary.runs += info2->summary.runs;
+  info1->summary.sum_max += info2->summary.sum_max;
+
   for (f_ix = 0; f_ix < n_functions; f_ix++)
     {
       unsigned t_ix;

libgcc/libgcov.h

@@ -217,6 +217,7 @@ struct gcov_info
                                                   to function information  */
 #else
   struct gcov_fn_info **functions;
+  struct gcov_summary summary;
 #endif /* !IN_GCOV_TOOL */
 };