1 files changed, 110 insertions, 0 deletions
diff --git a/tests/pr8365-remake-timing.test b/tests/pr8365-remake-timing.test
new file mode 100755
index 000000000..079b0c00a
--- /dev/null
+++ b/tests/pr8365-remake-timing.test
@@ -0,0 +1,110 @@
+#! /bin/sh
+# Copyright (C) 2011 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/>.
+
+# Test for automake bug#8365, related to Makefile remake rules.
+# The bug is due to subtle timestamp issues and limitations in
+# make's behaviour, and is very unlikely to be triggered (we have
+# to resort to timestamp edit hacks to consistently expose it); in
+# any account, it is nigh to impossible to trigger it by running
+# make by hand.  Thus, fixing it would not be worth the hassle, but
+# we prefer to keep it exposed anyway.
+
+. ./defs || Exit 1
+
+set -e
+
+# We'll use calls to stat to get debugging information.
+if stat /dev/null; then stat=stat; else stat=:; fi
+
+cat >> configure.in << 'END'
+FOOBAR=zardoz
+AC_OUTPUT
+END
+
+: > Makefile.am
+
+$ACLOCAL
+# Run automake *before* autoconf, because we want to ensure that
+# Makefile.in is not newer than configure.
+$AUTOMAKE
+$AUTOCONF
+
+./configure
+$MAKE Makefile
+$EGREP 'FOOBAR|zardoz' Makefile && Exit 99 # Sanity check.
+
+echo 'AC_SUBST([FOOBAR])' >> configure.in
+
+# Modified configure dependencies must have the same timestamp of
+# config.status and Makefile in order to trigger the bug.
+# We also re-touch config.status, because "touch -r" can truncate
+# timestamps on file systems with sub-second resolutions (see the
+# autoconf manual).  Finally, we also sleep before touching, to ensure
+# that the (possibly truncated) timestamps of config.status etc. are
+# strictly newer than the non-truncated configure timestamp.
+$stat config.status Makefile configure.in
+$sleep
+touch config.status
+touch -r config.status config.status Makefile configure.in
+$stat config.status Makefile configure.in
+
+# Also, the race condition is triggered only when aclocal, automake
+# and aclocal run fast enough to keep the timestamp of the generated
+# aclocal.m4, Makefile.in and configure equal to the timestamp of
+# Makefile & config.status.  To reproduce this race consistently, we
+# need the following hackish wrappers.
+
+save_AUTOCONF=$AUTOCONF
+
+cat > aclocal-wrap <<END
+#!/bin/sh
+set -ex
+# aclocal shouldn't use our autoconf wrapper when extracting
+# the races from configure.in.
+AUTOCONF='$save_AUTOCONF'; export AUTOCONF
+$ACLOCAL "\$@"
+touch -r config.status aclocal.m4
+$stat aclocal.m4
+END
+
+cat > automake-wrap <<END
+#!/bin/sh
+set -ex
+# automake shouldn't use our autoconf wrapper when extracting
+# the races from configure.in.
+AUTOCONF='$save_AUTOCONF'; export AUTOCONF
+$AUTOMAKE "\$@"
+touch -r config.status Makefile.in
+$stat Makefile.in
+END
+
+cat > autoconf-wrap <<END
+#!/bin/sh
+set -ex
+$AUTOCONF "\$@"
+touch -r config.status configure
+$stat configure
+END
+
+chmod a+x aclocal-wrap automake-wrap autoconf-wrap
+
+env \
+  ACLOCAL=./aclocal-wrap AUTOMAKE=./automake-wrap AUTOCONF=./autoconf-wrap \
+  $MAKE -e Makefile
+grep '^FOOBAR =' Makefile.in
+grep '^FOOBAR *= *zardoz *$' Makefile
+
+: