[ng] tests: Automake should let us append to undefined variables (someday)

This is not the case yet, mostly for historical reason.  However, allowing
that would mimic the behaviour of GNU make more closely (see the test case
't/spy-var-append.sh').  Likely (and hopefully), it would also simplify
the implementation.

* t/var-undef-append.sh: New test, still failing.
* Makefile.am (XFAIL_TESTS): Add it.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

diff --git a/Makefile.am b/Makefile.am
index 60d5ab7322797583919469fc9c76c9a60cbb850b..3eeb0327ec869debd90547b97a53441e511651ce 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -389,6 +389,7 @@ XFAIL_TESTS = \
   t/remake-am-pr10111.sh \
   t/remake-m4-pr10111.sh \
   t/txinfo5.sh \
+  t/var-undef-append.sh \
   $(perl_fake_XFAIL_TESTS)
 
 # Some testsuite-influential variables should be overridable from the

diff --git a/t/var-undef-append.sh b/t/var-undef-append.sh
new file mode 100755 (executable)
index 0000000..f59bacc
--- /dev/null
+++ b/t/var-undef-append.sh
@@ -0,0 +1,100 @@
+#! /bin/sh
+# Copyright (C) 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
+# 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/>.
+
+# Automake should allow us top append to undefined variables, for
+# consistency with GNU make.  For the same reason, if we override
+# a variable definition from the command line, any '+=' appending
+# to it should get overridden as well.
+# See also "spy" test 'spy-var-append.sh'.
+
+. ./defs || Exit 1
+
+cat >> configure.ac << 'END'
+AM_CONDITIONAL([COND_NO], [false])
+AM_CONDITIONAL([COND_YES], [:])
+AM_CONDITIONAL([COND_YES2], [:])
+AC_OUTPUT
+END
+
+cat > Makefile.am << 'END'
+var0 += foo0
+
+if COND_NO
+var00 += foo00
+endif
+
+if COND_YES
+if COND_YES2
+var000 += foo000
+endif
+endif
+
+if COND_NO
+var1 = oops
+endif
+var1 += bar
+if COND_YES
+var1 += baz
+endif
+if COND_NO
+var1 += oops
+endif
+
+if COND_YES
+var2 = a
+endif
+var2 += b
+
+if COND_YES
+var3 := c
+endif
+var3 += d
+
+var4 = cuckoo
+var4 += nightingale
+
+.PHONY: test1 test2
+test1:
+       test x'$(var0)' = x'foo0'
+       test x'$(var00)' = x''
+       test x'$(var000)' = x'foo000'
+       test x'$(var1)' = x'bar baz'
+       test x'$(var2)' = x'a b'
+       test x'$(var3)' = x'c d'
+        test x'$(var4)' = x'cuckoo nightingale'
+test2:
+       test x'$(var0)' = x
+       test x'$(var1)' = x'one'
+       test x'$(var2)' = x'two'
+       test x'$(var3)' = x'three'
+       test x'$(var4)' = x''
+END
+
+$ACLOCAL
+$AUTOMAKE
+$AUTOCONF
+
+./configure
+
+checkit ()
+{
+  $MAKE "$@" 2>stderr && test ! -s stderr || { cat stderr >&2; Exit 1; }
+}
+
+checkit test1
+checkit test2 var0= var1=one var2=two var3=three var4=
+
+: