CPU: Remove codegen directory if it exists

src/ngraph/file_util.cpp

@@ -78,6 +78,12 @@ size_t ngraph::file_util::get_file_size(const string& filename)
 
 void ngraph::file_util::remove_directory(const string& dir)
 {
+    struct stat status;
+    if (stat(dir.c_str(), &status) == -1)
+    {
+        return;
+    }
+
     file_util::iterate_files(dir,
                              [](const string& file, bool is_dir) {
                                  if (is_dir)

src/ngraph/runtime/cpu/external_function.cpp

@@ -328,6 +328,7 @@ extern "C" void free_aligned_buffer(void* allocated);
 
     string output_dir = "cpu_codegen";
     string function_name = m_function->get_name();
+    file_util::remove_directory(output_dir);
     file_util::make_directory(output_dir);
     string filename = file_util::path_join(output_dir, function_name + "_codegen.cpp");
     ofstream out(filename);