From 6e3282fe3893a42eb9c5cc4eba5387a3be4e8d10 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Tue, 28 Jun 2022 17:10:53 -0500
Subject: [PATCH] Refactor recent AC_FUNC_ALLOCA fix

* lib/autoconf/functions.m4 (AC_FUNC_ALLOCA): Simplify and use
AS_IF.  Had I done it this way originally I would have avoided the
bug that Jim just fixed.
---
 lib/autoconf/functions.m4 | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/lib/autoconf/functions.m4 b/lib/autoconf/functions.m4
index 51aeb0b9..70eb8760 100644
--- a/lib/autoconf/functions.m4
+++ b/lib/autoconf/functions.m4
@@ -426,10 +426,9 @@ if test $ac_cv_working_alloca_h = yes; then
 fi
 
 AC_CACHE_CHECK([for alloca], ac_cv_func_alloca_works,
-[if test $ac_cv_working_alloca_h = yes; then
-  ac_cv_func_alloca_works=yes
-else
-  AC_LINK_IFELSE([AC_LANG_PROGRAM(
+[ac_cv_func_alloca_works=$ac_cv_working_alloca_h
+AS_IF([test "$ac_cv_func_alloca_works" != yes],
+  [AC_LINK_IFELSE([AC_LANG_PROGRAM(
 [[#include <stdlib.h>
 #include <stddef.h>
 #ifndef alloca
@@ -447,11 +446,7 @@ void *alloca (size_t);
 #endif
 ]],                               [[char *p = (char *) alloca (1);
 				    if (p) return 0;]])],
-		[ac_cv_func_alloca_works=yes],
-		[ac_cv_func_alloca_works=no]
-		)
-fi
-])
+		[ac_cv_func_alloca_works=yes])])])
 
 if test $ac_cv_func_alloca_works = yes; then
   AC_DEFINE(HAVE_ALLOCA, 1,
-- 
2.36.1