py/makedefs: Use io.open with utf-8 encoding when processing source.

In case (user) source code contains utf-8 encoded data and the default
locale is not utf-8.

See #4592.

1 files changed, 2 insertions, 1 deletions

diff --git a/py/makemoduledefs.py b/py/makemoduledefs.py
index 18d327f00..f17b0e38d 100644
--- a/py/makemoduledefs.py
+++ b/py/makemoduledefs.py
@@ -8,6 +8,7 @@
 from __future__ import print_function
 
 import re
+import io
 import os
 import argparse
 
@@ -49,7 +50,7 @@ def find_module_registrations(c_file):
         # No c file to match the object file, skip
         return set()
 
-    with open(c_file) as c_file_obj:
+    with io.open(c_file, encoding='utf-8') as c_file_obj:
         return set(re.findall(pattern, c_file_obj.read()))