moveconfig: add a second pass for empty #if/#endif blocks

index caa81ac2ed77..ff70925f9ee4 100755
@@ -545,6 +545,28 @@ def confirm(options, prompt):
 
     return True
 
+def cleanup_empty_blocks(header_path, options):
+    """Clean up empty conditional blocks
+
+    Arguments:
+      header_path: path to the cleaned file.
+      options: option flags.
+    """
+    pattern = r'^\s*#\s*if.*$\n^\s*#\s*endif.*$\n*'
+    with open(header_path) as f:
+        data = f.read()
+
+    new_data = re.sub(pattern, '\n', data, flags=re.M)
+
+    show_diff(data.splitlines(True), new_data.splitlines(True), header_path,
+              options.color)
+
+    if options.dry_run:
+        return
+
+    with open(header_path, 'w') as f:
+        f.write(new_data)
+
 def cleanup_one_header(header_path, patterns, options):
     """Clean regex-matched lines away from a file.
 

@@ -626,8 +648,9 @@ def cleanup_headers(configs, options):
                 continue
             for filename in filenames:
                 if not fnmatch.fnmatch(filename, '*~'):
-                    cleanup_one_header(os.path.join(dirpath, filename),
-                                       patterns, options)
+                    header_path = os.path.join(dirpath, filename)
+                    cleanup_one_header(header_path, patterns, options)
+                    cleanup_empty_blocks(header_path, options)
 
 def cleanup_one_extra_option(defconfig_path, configs, options):
     """Delete config defines in CONFIG_SYS_EXTRA_OPTIONS in one defconfig file.