pythongh-105323: Update readline module to detect apple editline variant (pythongh-108665)

Author: corona10

Doc/using/configure.rst

@@ -758,11 +758,12 @@ Libraries options
 
    .. versionadded:: 3.3
 
-.. cmdoption:: --with-readline=editline
+.. cmdoption:: --with-readline=readline|editline
 
-   Use ``editline`` library for backend of the :mod:`readline` module.
+   Designate a backend library for the :mod:`readline` module.
 
-   Define the ``WITH_EDITLINE`` macro.
+   * readline: Use readline as the backend.
+   * editline: Use editline as the backend.
 
    .. versionadded:: 3.10
 

Modules/readline.c

@@ -1018,6 +1018,8 @@ on_hook(PyObject *func)
 static int
 #if defined(_RL_FUNCTION_TYPEDEF)
 on_startup_hook(void)
+#elif defined(WITH_APPLE_EDITLINE)
+on_startup_hook(const char *Py_UNUSED(text), int Py_UNUSED(state))
 #else
 on_startup_hook(void)
 #endif
@@ -1033,6 +1035,8 @@ on_startup_hook(void)
 static int
 #if defined(_RL_FUNCTION_TYPEDEF)
 on_pre_input_hook(void)
+#elif defined(WITH_APPLE_EDITLINE)
+on_pre_input_hook(const char *Py_UNUSED(text), int Py_UNUSED(state))
 #else
 on_pre_input_hook(void)
 #endif

configure

@@ -5832,6 +5832,7 @@ dnl library (tinfo ncursesw ncurses termcap). We now assume that libreadline
 dnl or readline.pc provide correct linker information.
 
 AH_TEMPLATE([WITH_EDITLINE], [Define to build the readline module against libedit.])
+AH_TEMPLATE([WITH_APPLE_EDITLINE], [Define to build the readline module against Apple BSD editline.])
 
 AC_ARG_WITH(
   [readline],
@@ -5848,6 +5849,15 @@ AC_ARG_WITH(
   [with_readline=readline]
 )
 
+# gh-105323: Need to handle the macOS editline as an alias of readline.
+AS_CASE([$ac_sys_system/$ac_sys_release],
+  [Darwin/*], [AC_CHECK_TYPE([Function],
+                             [AC_DEFINE([WITH_APPLE_EDITLINE])],
+                             [],
+                             [@%:@include <readline/readline.h>])],
+  []
+)
+
 AS_VAR_IF([with_readline], [readline], [
   PKG_CHECK_MODULES([LIBREADLINE], [readline], [
     LIBREADLINE=readline

configure.ac

@@ -1788,6 +1788,9 @@
 /* Define if WINDOW in curses.h offers a field _flags. */
 #undef WINDOW_HAS_FLAGS
 
+/* Define to build the readline module against Apple BSD editline. */
+#undef WITH_APPLE_EDITLINE
+
 /* Define if you want build the _decimal module using a coroutine-local rather
    than a thread-local context */
 #undef WITH_DECIMAL_CONTEXTVAR