GNU readline() mistakenly sets the LC_CTYPE locale.
This is evil. Only the user or the app's main() should do this!
We must save and restore the locale around the rl_initialize() call.
diff --git a/Modules/readline.c b/Modules/readline.c
index a2efd47..59ae8eb 100644
--- a/Modules/readline.c
+++ b/Modules/readline.c
@@ -12,6 +12,15 @@
#include <signal.h>
#include <errno.h>
+#if defined(HAVE_LOCALE_H) && defined(HAVE_SETLOCALE)
+/* GNU readline() mistakenly sets the LC_CTYPE locale.
+ * This is evil. Only the user or the app's main() should do this!
+ * We must save and restore the locale around the rl_initialize() call.
+ */
+#define SAVE_LOCALE
+#include <locale.h>
+#endif
+
/* GNU readline definitions */
#undef HAVE_CONFIG_H /* Else readline/chardefs.h includes strings.h */
#include <readline/readline.h>
@@ -538,6 +547,10 @@
static void
setup_readline(void)
{
+#ifdef SAVE_LOCALE
+ char *saved_locale = setlocale(LC_CTYPE, NULL);
+#endif
+
using_history();
rl_readline_name = "python";
@@ -571,6 +584,10 @@
* inside this function. Nothing we can do about it.
*/
rl_initialize();
+
+#ifdef SAVE_LOCALE
+ setlocale(LC_CTYPE, saved_locale); /* Restore locale */
+#endif
}