From ca23fa130c766ce0febf610b0e02ffbcab6bdb82 Mon Sep 17 00:00:00 2001
From: Stefan Fritsch <sf@apache.org>
Date: Mon, 14 Jun 2010 18:53:02 +0000
Subject: [PATCH] prevent an error message if an old autoconf without
 AC_PROG_CC_C99 is used but print a meaningful warning instead

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@954588 13f79535-47bb-0310-9956-ffa450edef68
---
 buildconf    | 12 ++++++++++++
 configure.in |  2 +-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/buildconf b/buildconf
index ad43fe53c9..772610343a 100755
--- a/buildconf
+++ b/buildconf
@@ -19,6 +19,18 @@
 # buildconf: Build the support scripts needed to compile from a
 #            checked-out version of the source code.
 
+# version check for AC_PROG_CC_C99
+ac_version=`${AUTOCONF:-autoconf} --version 2>/dev/null|sed -e 's/^[^0-9]*//;s/[a-z]* *$//;q'`
+case "$ac_version" in
+# versions older than 2.50 are denied by AC_PREREQ
+2.5*)
+    echo WARNING: You are using an outdated version of autoconf.
+    echo WARNING: This may lead to less than optimal performance of httpd.
+    echo WARNING: You should use autoconf 2.60 or newer.
+    sleep 1
+    ;;
+esac
+
 # set a couple of defaults for where we should be looking for our support libs.
 # can be overridden with --with-apr=[dir] and --with-apr-util=[dir]
 
diff --git a/configure.in b/configure.in
index 252a3599cf..765f59506e 100644
--- a/configure.in
+++ b/configure.in
@@ -171,7 +171,7 @@ AC_PROG_CC
 AC_PROG_CPP
 
 dnl Try to get c99 support for variadic macros
-AC_PROG_CC_C99
+ifdef([AC_PROG_CC_C99], [AC_PROG_CC_C99])
 
 if test "x${cache_file}" = "x/dev/null"; then
   # Likewise, ensure that CC and CPP are passed through to the pcre
-- 
2.50.1