gh-109191: Fix build with newer editline (gh-110239)

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

@@ -446,7 +446,7 @@ 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

@@ -24668,6 +24668,25 @@ printf "%s\n" "#define HAVE_RL_APPEND_HISTORY 1" >>confdefs.h
 
 fi
 
+    # in readline as well as newer editline (April 2023)
+    ac_fn_c_check_type "$LINENO" "rl_compdisp_func_t" "ac_cv_type_rl_compdisp_func_t" "
+      #include <stdio.h> /* Must be first for Gnu Readline */
+      #ifdef WITH_EDITLINE
+      # include <editline/readline.h>
+      #else
+      # include <readline/readline.h>
+      # include <readline/history.h>
+      #endif
+
+"
+if test "x$ac_cv_type_rl_compdisp_func_t" = xyes
+then :
+
+printf "%s\n" "#define HAVE_RL_COMPDISP_FUNC_T 1" >>confdefs.h
+
+fi
+
+
 
 
 CFLAGS=$save_CFLAGS

configure.ac

@@ -5999,6 +5999,13 @@ AS_VAR_IF([with_readline], [no], [
       AC_DEFINE([HAVE_RL_APPEND_HISTORY], [1], [Define if readline supports append_history])
     ])
 
+    # 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])],
+                  [],
+                  [readline_includes])
+
     m4_undefine([readline_includes])
   ])dnl WITH_SAVE_ENV()
 ])

pyconfig.h.in

@@ -983,6 +983,9 @@
 /* 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