Fix typo in variable name

Cherry-pick upstream patch f460883035ef849a2248b1713f711292ec19f4f0

Fixes BZ#2132715

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

0001-_AC_PROG_CXX_STDCXX_EDITION_TRY-fix-typo-in-variable.patch

@@ -0,0 +1,31 @@
+From f460883035ef849a2248b1713f711292ec19f4f0 Mon Sep 17 00:00:00 2001
+From: Emanuele Giaquinta <emanuele.giaquinta@gmail.com>
+Date: Fri, 14 May 2021 09:06:20 +0300
+Subject: [PATCH] _AC_PROG_CXX_STDCXX_EDITION_TRY: fix typo in variable name
+
+The typo causes "ac_prog_cxx_stdcxx" to be always set to "cxx11",
+regardless of whether the C++ compiler supports C++11.
+Message-Id: <YJ4TXAeJcvU0oSec@FSAPPLE2215.fi.f-secure.com>
+(tiny change)
+---
+ lib/autoconf/c.m4 | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4
+index 9f881f0b..47434c89 100644
+--- a/lib/autoconf/c.m4
++++ b/lib/autoconf/c.m4
+@@ -2749,8 +2749,8 @@ AC_DEFUN([_AC_PROG_CXX_STDCXX_EDITION_TRY],
+ [AC_REQUIRE([_AC_CXX_CXX$1_TEST_PROGRAM])]dnl
+ [AS_IF([test x$ac_prog_cxx_stdcxx = xno],
+ [AC_MSG_CHECKING([for $CXX option to enable C++$1 features])
+-AC_CACHE_VAL(ac_cv_prog_cxx_$1,
+-[ac_cv_prog_cxx_$1=no
++AC_CACHE_VAL(ac_cv_prog_cxx_cxx$1,
++[ac_cv_prog_cxx_cxx$1=no
+ ac_save_CXX=$CXX
+ AC_LANG_CONFTEST([AC_LANG_DEFINES_PROVIDED][$][ac_cxx_conftest_cxx$1_program])
+ for ac_arg in '' m4_normalize(m4_defn([_AC_CXX_CXX$1_OPTIONS]))
+-- 
+2.37.2
+

autoconf.spec

@@ -6,13 +6,16 @@
 Summary:    A GNU tool for automatically configuring source code
 Name:       autoconf
 Version:    2.71
-Release:    3%{?dist}
+Release:    4%{?dist}
 License:    GPLv2+ and GFDL
 Source0:    https://ftp.gnu.org/gnu/autoconf/autoconf-%{version}.tar.xz
 Source1:    config.site
 Source2:    autoconf-init.el
 URL:        https://www.gnu.org/software/autoconf/
 
+# Cherry-pick from upstream f460883035ef849a2248b1713f711292ec19f4f0
+Patch0: 0001-_AC_PROG_CXX_STDCXX_EDITION_TRY-fix-typo-in-variable.patch
+
 BuildArch:  noarch
 
 
@@ -124,6 +127,9 @@ install -p -m 0644 %{SOURCE2} %{buildroot}%{_emacs_sitestartdir}
 
 
 %changelog
+* Tue Oct 11 2022 Frederic Berat <fberat@redhat.com> - 2.71-4
+- Cherry-pick: Fix typo in variable name (#2132715)
+
 * Wed Jul 20 2022 Fedora Release Engineering <releng@fedoraproject.org> - 2.71-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_37_Mass_Rebuild