#! /bin/sh
# Copyright (C) 2003, 2006  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
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Make sure aclocal does not overwrite aclocal.m4 needlessly.
# Also make sure automake --no-force does not overwrite Makefile.in needlessly.

. ./defs || Exit 1

set -e

cat >> configure.in << 'END'
SOME_DEFS
AC_CONFIG_FILES([sub/Makefile])
END

mkdir sub
: > sub/Makefile.am

cat >> Makefile.am << 'END'
SUBDIRS = sub
include fragment.inc
END

: > fragment.inc

mkdir m4
echo 'AC_DEFUN([SOME_DEFS], [])' > m4/somedefs.m4

$sleep

$ACLOCAL -I m4

# Automake will take aclocal.m4 to be newer if it has the same timestamp
# as Makefile.in.  Avoid the confusing by sleeping.
$sleep

$AUTOMAKE --no-force

$sleep

touch foo
$ACLOCAL -I m4
$AUTOMAKE --no-force

# aclocal.m4 and Makefile.in should not have been updated, so `foo'
# should be younger
test `ls -1t aclocal.m4 Makefile.in sub/Makefile.in foo | sed 1q` = foo

$sleep
$ACLOCAL -I m4 --force
test `ls -1t aclocal.m4 foo | sed 1q` = aclocal.m4
# We still use --no-force for automake, but since aclocal.m4 has
# changed all Makefile.ins should be updated.
$sleep
$AUTOMAKE --no-force
test `ls -1t Makefile.in foo | sed 1q` = Makefile.in
test `ls -1t sub/Makefile.in foo | sed 1q` = sub/Makefile.in

touch m4/somedefs.m4
$sleep
touch foo
$sleep
$ACLOCAL -I m4
$sleep
$AUTOMAKE --no-force

# aclocal.m4 should have been updated, although its contents haven't changed.
test `ls -1t aclocal.m4 foo | sed 1q` = aclocal.m4
test `ls -1t Makefile.in foo | sed 1q` = Makefile.in
test `ls -1t sub/Makefile.in foo | sed 1q` = sub/Makefile.in

touch fragment.inc
$sleep
touch foo
$sleep
$ACLOCAL -I m4
$AUTOMAKE --no-force
# Only ./Makefile.in should change.
test `ls -1t aclocal.m4 foo | sed 1q` = foo
test `ls -1t Makefile.in foo | sed 1q` = Makefile.in
test `ls -1t sub/Makefile.in foo | sed 1q` = foo

grep README Makefile.in && Exit 1

: > README
$sleep
touch foo
$sleep
$AUTOMAKE --no-force
# Even if no dependency change, the content changed.
test `ls -1t Makefile.in foo | sed 1q` = Makefile.in
test `ls -1t sub/Makefile.in foo | sed 1q` = foo

grep README Makefile.in

: > sub/Makefile.in
$sleep
touch foo
$sleep
$ACLOCAL -I m4
$AUTOMAKE --no-force
# Only sub/Makefile.in should change.
test `ls -1t aclocal.m4 foo | sed 1q` = foo
test `ls -1t Makefile.in foo | sed 1q` = foo
test `ls -1t sub/Makefile.in foo | sed 1q` = sub/Makefile.in