diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 2807eb23f85d60704637db38a7eb8c0886b26203..f7eecc45d12cd5c5776eb157671fcd4959e213a4 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2017-04-18  Martin Liska  <mliska@suse.cz>
+
+	PR gcov-profile/78783
+	* gcov-tool.c (gcov_output_files): Validate that destination
+	file is either removed by the tool or by a user.
+
 2017-04-14  Andrew Burgess  <andrew.burgess@embecosm.com>
 	    Guy Benyei  <guybe@mellanox.com>
 
diff --git a/gcc/gcov-tool.c b/gcc/gcov-tool.c
index cadf09377ddb56997c92fca8c2efc818ed895e3a..80c08354857b69d5dd9478fc8fa3fc375462845b 100644
--- a/gcc/gcov-tool.c
+++ b/gcc/gcov-tool.c
@@ -46,6 +46,7 @@ extern int gcov_profile_normalize (struct gcov_info*, gcov_type);
 extern int gcov_profile_scale (struct gcov_info*, float, int, int);
 extern struct gcov_info* gcov_read_profile_dir (const char*, int);
 extern void gcov_do_dump (struct gcov_info *, int);
+extern const char *gcov_get_filename (struct gcov_info *list);
 extern void gcov_set_verbose (void);
 
 /* Set to verbose output mode.  */
@@ -114,6 +115,14 @@ gcov_output_files (const char *out, struct gcov_info *profile)
   if (ret)
     fatal_error (input_location, "Cannot change directory to %s", out);
 
+  /* Verify that output file does not exist (either was removed by
+     unlink_profile_data or removed by user).  */
+  const char *filename = gcov_get_filename (profile);
+
+  if (access (filename, F_OK) != -1)
+    fatal_error (input_location, "output file %s already exists in folder %s",
+		 filename, out);
+
   gcov_do_dump (profile, 0);
 
   ret = chdir (pwd);
diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog
index 1dc5469cd8c7a2e7168fe2687611ab86e6bb21f0..593cd09db8be94b4a13f0cbe54aa0d2acb7c315a 100644
--- a/libgcc/ChangeLog
+++ b/libgcc/ChangeLog
@@ -1,3 +1,8 @@
+2017-04-18  Martin Liska  <mliska@suse.cz>
+
+	PR gcov-profile/78783
+	* libgcov-driver.c (gcov_get_filename): New function.
+
 2017-04-07  Jeff Law  <law@redhat.com>
 
 	* Makefile.in: Swap definition of LIBGCC_LINKS and inclusion of
diff --git a/libgcc/libgcov-driver.c b/libgcc/libgcov-driver.c
index 70fe69f26b5b1563ae8f25dd66a642f81322b2f1..c3b2fd4d5ce4db3fd85cd3e901df7e314a4b94d3 100644
--- a/libgcc/libgcov-driver.c
+++ b/libgcc/libgcov-driver.c
@@ -852,6 +852,15 @@ gcov_do_dump (struct gcov_info *list, int run_counted)
   free (gf.filename);
 }
 
+#if IN_GCOV_TOOL
+const char *
+__attribute__ ((unused))
+gcov_get_filename (struct gcov_info *list)
+{
+  return list->filename;
+}
+#endif
+
 #if !IN_GCOV_TOOL
 void
 __gcov_dump_one (struct gcov_root *root)