Index: ChangeLog
--- ChangeLog
+++ ChangeLog
@@ -1,1 +1,9 @@
+2001-11-01  Alexandre Duret-Lutz  <address@hidden>
+
+	* automake.in (handle_single_transform_list): Don't call
+	$lang->target_hook for undefinied langages.
+	* tests/suffix4.test: New test.
+	* tests/Makefile.am (TESTS): Add suffix4.test.
+	Reported by Dmitry Mikhin <dmitrym.acres.com.au>.
+

Index: THANKS
===================================================================
RCS file: /cvs/automake/automake/THANKS,v
retrieving revision 1.152
diff -u -r1.152 THANKS
--- THANKS 2001/11/01 11:45:25 1.152
+++ THANKS 2001/11/01 20:10:22
@@ -34,6 +34,7 @@
 David Zaroski		address@hidden
 Derek R. Price		address@hidden
 Dieter Baron		address@hidden
+Dmitry Mikhin		dmitrym.acres.com.au
 Doug Evans		address@hidden
 Eleftherios Gkioulekas	address@hidden
 Elrond			address@hidden
Index: automake.in
===================================================================
RCS file: /cvs/automake/automake/automake.in,v
retrieving revision 1.1225
diff -u -r1.1225 automake.in
--- automake.in 2001/10/31 18:39:34 1.1225
+++ automake.in 2001/11/01 20:10:42
@@ -1892,8 +1892,10 @@
             }
         }
 
-	# Let the language do some special magic if required.
-	$lang->target_hook ($aggregate, $object, $full);
+	if (defined $lang) {
+	    # Let the language do some special magic if required.
+	    $lang->target_hook ($aggregate, $object, $full);
+	}
 
 	if ($derived_source)
 	{
Index: tests/Makefile.am
===================================================================
RCS file: /cvs/automake/automake/tests/Makefile.am,v
retrieving revision 1.349
diff -u -r1.349 Makefile.am
--- tests/Makefile.am 2001/10/26 10:01:05 1.349
+++ tests/Makefile.am 2001/11/01 20:10:43
@@ -288,6 +288,7 @@
 suffix.test \
 suffix2.test \
 suffix3.test \
+suffix4.test \
 symlink.test \
 symlink2.test \
 symlink3.test \
Index: tests/suffix4.test
===================================================================
RCS file: suffix4.test
diff -N suffix4.test
--- /dev/null	Tue May  5 13:32:27 1998
+++ tests/suffix4.test Thu Nov 1 12:10:43 2001
@@ -0,0 +1,22 @@
+#! /bin/sh
+
+# Test to make sure Automake doesn't abort on user-defined extensions.
+# Based on a report from Dmitry Mikhin <dmitrym.acres.com.au>.
+
+# Also make sure that .SUFFIXES is automatically adjusted with
+# extensions from implicit rules.
+
+. $srcdir/defs || exit 1
+
+cat > Makefile.am << 'END'
+.k.o:
+	echo $< > $@
+
+bin_PROGRAMS = foo
+foo_SOURCES = foo.k
+END
+
+$ACLOCAL || exit 1
+$AUTOMAKE --Wno-error || exit 1
+grep '.SUFFIXES:.*\.k' Makefile.in || exit 1
+exit 0