[3.11] gh-109191: Fix build with newer editline (gh-110239) (#110575)

(cherry picked from commit f4cb0d2)

Author: Bo98

Misc/NEWS.d/next/Build/2023-10-05-11-46-20.gh-issue-109191.imUkVN.rst

@@ -0,0 +1 @@
+Fix compile error when building with recent versions of libedit.

Modules/readline.c

@@ -440,7 +440,7 @@ readline_set_completion_display_matches_hook_impl(PyObject *module,
        default completion display. */
     rl_completion_display_matches_hook =
         readlinestate_global->completion_display_matches_hook ?
-#if defined(_RL_FUNCTION_TYPEDEF)
+#if defined(HAVE_RL_COMPDISP_FUNC_T)
         (rl_compdisp_func_t *)on_completion_display_matches_hook : 0;
 #else
         (VFunction *)on_completion_display_matches_hook : 0;

configure

@@ -5918,6 +5918,20 @@ if test "$py_cv_lib_readline" = yes; then
   AC_CHECK_LIB($LIBREADLINE, append_history,
     AC_DEFINE(HAVE_RL_APPEND_HISTORY, 1,
       [Define if readline supports append_history]),,$READLINE_LIBS)
+
+  # in readline as well as newer editline (April 2023)
+  AC_CHECK_TYPE([rl_compdisp_func_t],
+                [AC_DEFINE([HAVE_RL_COMPDISP_FUNC_T], [1],
+                           [Define if readline supports rl_compdisp_func_t])],
+                [],
+                [
+#include <stdio.h> /* Must be first for Gnu Readline */
+#ifdef WITH_EDITLINE
+# include <editline/readline.h>
+#else
+# include <readline/readline.h>
+#endif
+                ])
 fi
 
 # End of readline checks: restore LIBS

configure.ac

@@ -968,6 +968,9 @@
 /* Define if you can turn off readline's signal handling. */
 #undef HAVE_RL_CATCH_SIGNAL
 
+/* Define if readline supports rl_compdisp_func_t */
+#undef HAVE_RL_COMPDISP_FUNC_T
+
 /* Define if you have readline 2.2 */
 #undef HAVE_RL_COMPLETION_APPEND_CHARACTER