From 8515fd79fef1ac16d7848cec5ec1797294cb5366 Mon Sep 17 00:00:00 2001
From: Joshua Root <jmr@macports.org>
Date: Wed, 17 Apr 2024 19:26:10 +1000
Subject: [PATCH] gh-117845: Detect libedit hook function signature in
 configure (#117870)

Older libedit versions (like Apple's) use a different type signature
for rl_startup_hook and rl_pre_input_hook. Add a configure check to
determine which signature is accepted by introducing the
Py_RL_STARTUP_HOOK_TAKES_ARGS macro in pyconfig.h.
---
 ...-04-15-08-35-06.gh-issue-117845.IowzyW.rst |  1 +
 Modules/readline.c                            |  4 +-
 configure                                     | 50 +++++++++++++++++++
 configure.ac                                  | 15 ++++++
 pyconfig.h.in                                 |  3 ++
 5 files changed, 71 insertions(+), 2 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Build/2024-04-15-08-35-06.gh-issue-117845.IowzyW.rst

diff --git a/Misc/NEWS.d/next/Build/2024-04-15-08-35-06.gh-issue-117845.IowzyW.rst b/Misc/NEWS.d/next/Build/2024-04-15-08-35-06.gh-issue-117845.IowzyW.rst
new file mode 100644
index 00000000000..02d62da15b2
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2024-04-15-08-35-06.gh-issue-117845.IowzyW.rst
@@ -0,0 +1 @@
+Fix building against recent libedit versions by detecting readline hook signatures in :program:`configure`.
diff --git a/Modules/readline.c b/Modules/readline.c
index e29051c37f8..c5c34535de0 100644
--- a/Modules/readline.c
+++ b/Modules/readline.c
@@ -1041,7 +1041,7 @@ on_hook(PyObject *func)
 }
 
 static int
-#if defined(_RL_FUNCTION_TYPEDEF)
+#if defined(_RL_FUNCTION_TYPEDEF) || !defined(Py_RL_STARTUP_HOOK_TAKES_ARGS)
 on_startup_hook(void)
 #else
 on_startup_hook(const char *Py_UNUSED(text), int Py_UNUSED(state))
@@ -1061,7 +1061,7 @@ on_startup_hook(const char *Py_UNUSED(text), int Py_UNUSED(state))
 
 #ifdef HAVE_RL_PRE_INPUT_HOOK
 static int
-#if defined(_RL_FUNCTION_TYPEDEF)
+#if defined(_RL_FUNCTION_TYPEDEF) || !defined(Py_RL_STARTUP_HOOK_TAKES_ARGS)
 on_pre_input_hook(void)
 #else
 on_pre_input_hook(const char *Py_UNUSED(text), int Py_UNUSED(state))
diff --git a/configure b/configure
index 6782d470aad..29a7d5b2b86 100755
--- a/configure
+++ b/configure
@@ -25367,6 +25367,56 @@ printf "%s\n" "#define HAVE_RL_COMPDISP_FUNC_T 1" >>confdefs.h
 fi
 
 
+    # Some editline versions declare rl_startup_hook as taking no args, others
+    # declare it as taking 2.
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if rl_startup_hook takes arguments" >&5
+printf %s "checking if rl_startup_hook takes arguments... " >&6; }
+if test ${ac_cv_readline_rl_startup_hook_takes_args+y}
+then :
+  printf %s "(cached) " >&6
+else $as_nop
+
+        cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+      #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
+
+                extern int test_hook_func(const char *text, int state);
+int
+main (void)
+{
+rl_startup_hook=test_hook_func;
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  ac_cv_readline_rl_startup_hook_takes_args=yes
+else $as_nop
+  ac_cv_readline_rl_startup_hook_takes_args=no
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_readline_rl_startup_hook_takes_args" >&5
+printf "%s\n" "$ac_cv_readline_rl_startup_hook_takes_args" >&6; }
+    if test "x$ac_cv_readline_rl_startup_hook_takes_args" = xyes
+then :
+
+
+printf "%s\n" "#define Py_RL_STARTUP_HOOK_TAKES_ARGS 1" >>confdefs.h
+
+
+fi
+
 
 
 CFLAGS=$save_CFLAGS
diff --git a/configure.ac b/configure.ac
index 51a0d35dbc3..7723c805b93 100644
--- a/configure.ac
+++ b/configure.ac
@@ -6341,6 +6341,21 @@ AS_VAR_IF([with_readline], [no], [
     # in readline as well as newer editline (April 2023)
     AC_CHECK_TYPES([rl_compdisp_func_t], [], [], [readline_includes])
 
+    # Some editline versions declare rl_startup_hook as taking no args, others
+    # declare it as taking 2.
+    AC_CACHE_CHECK([if rl_startup_hook takes arguments], [ac_cv_readline_rl_startup_hook_takes_args], [
+        AC_COMPILE_IFELSE(
+            [AC_LANG_PROGRAM([readline_includes]
+                [extern int test_hook_func(const char *text, int state);],
+                [rl_startup_hook=test_hook_func;])],
+            [ac_cv_readline_rl_startup_hook_takes_args=yes],
+            [ac_cv_readline_rl_startup_hook_takes_args=no]
+        )
+    ])
+    AS_VAR_IF([ac_cv_readline_rl_startup_hook_takes_args], [yes], [
+      AC_DEFINE([Py_RL_STARTUP_HOOK_TAKES_ARGS], [1], [Define if rl_startup_hook takes arguments])
+    ])
+
     m4_undefine([readline_includes])
   ])dnl WITH_SAVE_ENV()
 ])
diff --git a/pyconfig.h.in b/pyconfig.h.in
index e28baef51d5..c279b147db3 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -1659,6 +1659,9 @@
    SipHash13: 3, externally defined: 0 */
 #undef Py_HASH_ALGORITHM
 
+/* Define if rl_startup_hook takes arguments */
+#undef Py_RL_STARTUP_HOOK_TAKES_ARGS
+
 /* Define if you want to enable internal statistics gathering. */
 #undef Py_STATS