Always pass an encoding to open() using text mode

Otherwise we'll end up using the locale encoding. While it's usually utf-8,
that's not the case on Windows.

There is one place where a file with filenames is passed, not sure there
so I left it and passed a explicit None.

2 files changed, 2 insertions, 2 deletions

diff --git a/misc/update-gtkdoc-tests.py b/misc/update-gtkdoc-tests.py
index c182fc11..6f45e348 100644
--- a/misc/update-gtkdoc-tests.py
+++ b/misc/update-gtkdoc-tests.py
@@ -191,7 +191,7 @@ if __name__ == '__main__':
                 writer = GtkDocCommentBlockWriter(indent=True)
                 logger.enable_warnings(True)
 
-                with io.open(path, 'r') as f:
+                with io.open(path, 'r', encoding='utf-8') as f:
                     lines = f.readlines()
 
                 chunks = []
diff --git a/misc/update-vulkan-gir.py b/misc/update-vulkan-gir.py
index 89792c12..4154702a 100644
--- a/misc/update-vulkan-gir.py
+++ b/misc/update-vulkan-gir.py
@@ -24,7 +24,7 @@ def show_func_defs(filename, output, extra_cpp_args=None):
     ast = parse_file(filename, use_cpp=True,
                      cpp_args=extra_cpp_args)
 
-    with open(output, 'w') as f:
+    with open(output, 'w', encoding='utf-8') as f:
         f.write("""<?xml version="1.0"?>
 <repository version="1.2"
             xmlns="http://www.gtk.org/introspection/core/1.0"