FYI: spy.test for ::-rules

[Alexandre Duret-Lutz]

This was discussed in April/May, when Eric Siegerman (IIRC) suggested
using ::-rules to simplify

http://mail.gnu.org/archive/html/automake/2003-05/msg00089.html

2003-11-10  Alexandre Duret-Lutz  <address@hidden>

        * tests/spy.test: New file.
        * tests/Makefile.am (TESTS): Add spy.test.

Index: tests/Makefile.am
===================================================================
RCS file: /cvs/automake/automake/tests/Makefile.am,v
retrieving revision 1.525
diff -u -r1.525 Makefile.am
--- tests/Makefile.am   10 Nov 2003 20:55:33 -0000      1.525
+++ tests/Makefile.am   10 Nov 2003 21:47:50 -0000
@@ -409,6 +409,7 @@
 spell2.test \
 spell3.test \
 spelling.test \
+spy.test \
 stamph2.test \
 stdlib.test \
 stdlib2.test \
Index: tests/spy.test
===================================================================
RCS file: tests/spy.test
diff -N tests/spy.test
--- /dev/null   1 Jan 1970 00:00:00 -0000
+++ tests/spy.test      10 Nov 2003 21:47:51 -0000
@@ -0,0 +1,84 @@
+#! /bin/sh
+# Copyright (C) 2003  Free Software Foundation, Inc.
+#
+# This file is part of GNU Automake.
+#
+# GNU Automake 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.
+#
+# GNU Automake 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 autoconf; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
+# Check whether double colon rules work.  The Unix V7 make manual
+# mentions double-colon rules, but POSIX does not.  They seem to be
+# supported by all Make implementation as we can tell. This test case
+# is a spy: we want to detect if there exist implementations where
+# these do not work.  We might use these rules to simplify the rebuild
+# rules (instead of the $? hack).
+
+. ./defs || exit 1
+
+set -e
+
+cat >Makefile <<\EOF
+a :: b
+       echo rule1 >> $@
+a :: c
+       echo rule2 >> $@
+a :: b c
+       echo rule3 >> $@
+EOF
+
+touch b c
+$MAKE
+test "`cat a`" = rule1
+: > a
+$sleep
+touch b
+$MAKE
+test "`cat a`" = rule1
+: > a
+$sleep
+touch c
+$MAKE
+test "`cat a`" = rule2
+: > a
+$sleep
+touch b c
+$MAKE
+test "`cat a`" = rule1
+
+
+: > a
+$sleep
+cat >Makefile <<\EOF
+a :: b c
+       echo rule1 >> $@
+a :: c
+       echo rule2 >> $@
+a :: b
+       echo rule3 >> $@
+EOF
+
+touch b
+$MAKE
+test "`cat a`" = rule1
+: > a
+$sleep
+touch c
+$MAKE
+test "`cat a`" = rule1
+: > a
+$sleep
+touch b c
+$MAKE
+test "`cat a`" = rule1
-- 
Alexandre Duret-Lutz