gh-133967: Do not normalize locale name 'C.UTF-8' to 'en_US.UTF-8' (#135347)

diff --git a/Lib/locale.py b/Lib/locale.py
index 2feb10e59c96a38592c28c33845ff335237e6cb1..dfedc6386cb891e0c0f312b4f52d880fa993bf31 100644 (file)
--- a/Lib/locale.py
+++ b/Lib/locale.py
@@ -883,6 +883,10 @@ del k, v
 #    updated 'sr@latn' -> 'sr_CS.UTF-8@latin' to 'sr_RS.UTF-8@latin'
 #    removed 'univ'
 #    removed 'universal'
+#
+# SS 2025-06-10:
+# Remove 'c.utf8' -> 'en_US.UTF-8' because 'en_US.UTF-8' does not exist
+# on all platforms.
 
 locale_alias = {
     'a3':                                   'az_AZ.KOI8-C',
@@ -962,7 +966,6 @@ locale_alias = {
     'c.ascii':                              'C',
     'c.en':                                 'C',
     'c.iso88591':                           'en_US.ISO8859-1',
-    'c.utf8':                               'en_US.UTF-8',
     'c_c':                                  'C',
     'c_c.c':                                'C',
     'ca':                                   'ca_ES.ISO8859-1',

diff --git a/Lib/test/test_locale.py b/Lib/test/test_locale.py
index 455d2af37efdc80b5877b028a0a0eda23a8ce24e..55b502e52ca45450b4942127aabafa06734dc773 100644 (file)
--- a/Lib/test/test_locale.py
+++ b/Lib/test/test_locale.py
@@ -387,6 +387,10 @@ class NormalizeTest(unittest.TestCase):
         self.check('c', 'C')
         self.check('posix', 'C')
 
+    def test_c_utf8(self):
+        self.check('c.utf8', 'C.UTF-8')
+        self.check('C.UTF-8', 'C.UTF-8')
+
     def test_english(self):
         self.check('en', 'en_US.ISO8859-1')
         self.check('EN', 'en_US.ISO8859-1')

diff --git a/Misc/NEWS.d/next/Library/2025-06-10-16-11-00.gh-issue-133967.P0c24q.rst b/Misc/NEWS.d/next/Library/2025-06-10-16-11-00.gh-issue-133967.P0c24q.rst
new file mode 100644 (file)
index 0000000..1976981
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-06-10-16-11-00.gh-issue-133967.P0c24q.rst
@@ -0,0 +1 @@
+Do not normalize :mod:`locale` name 'C.UTF-8' to 'en_US.UTF-8'.

diff --git a/Tools/i18n/makelocalealias.py b/Tools/i18n/makelocalealias.py
index b407a8a643be7c047d93c21405cb7ae0295ca10f..02af1caff7d499813f8846c50422617d5e783ea1 100755 (executable)
--- a/Tools/i18n/makelocalealias.py
+++ b/Tools/i18n/makelocalealias.py
@@ -140,6 +140,9 @@ if __name__ == '__main__':
     data = locale.locale_alias.copy()
     data.update(parse_glibc_supported(args.glibc_supported))
     data.update(parse(args.locale_alias))
+    # Hardcode 'c.utf8' -> 'C.UTF-8' because 'en_US.UTF-8' does not exist
+    # on all platforms.
+    data['c.utf8'] = 'C.UTF-8'
     while True:
         # Repeat optimization while the size is decreased.
         n = len(data)