[PATCH 1/3] build: use configure.ac, not configure.in

[Stefano Lattarini]

Support for the latter name will soon start to cause warnings in
Autoconf and Automake, and will likely be later removed altogether
in future versions of those packages.

For more reference, see:
<https://lists.gnu.org/archive/html/autoconf-patches/2012-05/msg00004.html>
<https://lists.gnu.org/archive/html/automake-patches/2012-06/msg00004.html>

Copyright-paperwork-exempt: yes
Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>
---
 INSTALL                      | 4 ++--
 MANIFEST                     | 2 +-
 Makefile.in                  | 4 ++--
 configure.in => configure.ac | 0
 doc/bashref.texi             | 4 ++--
 support/mkconffiles          | 2 +-
 6 files changed, 8 insertions(+), 8 deletions(-)
 rename configure.in => configure.ac (100%)

diff --git a/INSTALL b/INSTALL
index 16fa685..05e741c 100644
--- a/INSTALL
+++ b/INSTALL
@@ -47,8 +47,8 @@ out how `configure' could check whether or not to do them, 
and mail
 diffs or instructions to <bash-maintainers@gnu.org> so they can be
 considered for the next release.
 
-The file `configure.in' is used to create `configure' by a program
-called Autoconf.  You only need `configure.in' if you want to change it
+The file `configure.ac' is used to create `configure' by a program
+called Autoconf.  You only need `configure.ac' if you want to change it
 or regenerate `configure' using a newer version of Autoconf.  If you do
 this, make sure you are using Autoconf version 2.50 or newer.
 
diff --git a/MANIFEST b/MANIFEST
index 11fd275..200e09c 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -51,7 +51,7 @@ README                f
 RBASH          f
 AUTHORS                f
 Y2K            f
-configure.in   f
+configure.ac   f
 configure      f       755
 Makefile.in    f
 config-top.h   f
diff --git a/Makefile.in b/Makefile.in
index 9f9276d..04901a7 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -1,6 +1,6 @@
 # Makefile for bash-4.2, version 4.4
 #
-# Copyright (C) 1996-2010 Free Software Foundation, Inc.
+# Copyright (C) 1996-2012 Free Software Foundation, Inc.
 
 #   This program is free software: you can redistribute it and/or modify
 #   it under the terms of the GNU General Public License as published by
@@ -710,7 +710,7 @@ pathnames.h:                Makefile 
$(srcdir)/pathnames.h.in
        @${RM} pathnames.tmp
 
 # comment out for distribution
-$(srcdir)/configure:   $(srcdir)/configure.in $(srcdir)/aclocal.m4 
$(srcdir)/config.h.in
+$(srcdir)/configure:   $(srcdir)/configure.ac $(srcdir)/aclocal.m4 
$(srcdir)/config.h.in
        cd $(srcdir) && autoconf
 
 # for chet
diff --git a/configure.in b/configure.ac
similarity index 100%
rename from configure.in
rename to configure.ac
diff --git a/doc/bashref.texi b/doc/bashref.texi
index ae982d5..5448302 100644
--- a/doc/bashref.texi
+++ b/doc/bashref.texi
@@ -7232,9 +7232,9 @@ to do them, and mail diffs or instructions to
 @email{bash-maintainers@@gnu.org} so they can be
 considered for the next release.
 
-The file @file{configure.in} is used to create @code{configure}
+The file @file{configure.ac} is used to create @code{configure}
 by a program called Autoconf.  You only need
-@file{configure.in} if you want to change it or regenerate
+@file{configure.ac} if you want to change it or regenerate
 @code{configure} using a newer version of Autoconf.  If
 you do this, make sure you are using Autoconf version 2.50 or
 newer.
diff --git a/support/mkconffiles b/support/mkconffiles
index 9eb2231..59e4c0f 100755
--- a/support/mkconffiles
+++ b/support/mkconffiles
@@ -1,7 +1,7 @@
 #! /bin/sh
 #
 # mkconffiles - create _distribution and _patchlevel files in preparation
-#              for recreating `configure' from `configure.in'
+#              for recreating `configure' from `configure.ac'
 #
 # options:
 #      -s srcdir       directory where `configure' resides (defaults to `.')
-- 
1.7.12