Fix Savannah bug #35410: handle escape chars in filter/filter-out

Also add a valgrind suppression file for Guile-enabled make.

tests/scripts/functions/filter-out

@@ -1,6 +1,6 @@
 #                                                                    -*-perl-*-
 
-$description = "Test the filter-out function.";
+$description = "Test the filter and filter-out functions.";
 
 $details = "The makefile created in this test has two variables.  The
 filter-out function is first used to discard names ending in
@@ -11,18 +11,32 @@ which is only used if there are multiple literals present in both
 the pattern and text arguments.  The result of both filter-out
 functions is the same single .elc name.\n";
 
-open(MAKEFILE,"> $makefile");
+# Basic test -- filter
+run_make_test(q!
+files1 := $(filter %.o, foo.elc bar.o lose.o)
+files2 := $(filter %.o foo.i, foo.i bar.i lose.i foo.elc bar.o lose.o)
+all: ; @echo '$(files1) $(files2)'
+!,
+              '', "bar.o lose.o foo.i bar.o lose.o\n");
 
-print MAKEFILE <<'EOF';
+# Basic test -- filter-out
+run_make_test(q!
 files1 := $(filter-out %.o, foo.elc bar.o lose.o)
 files2 := $(filter-out foo.i bar.i lose.i %.o, foo.i bar.i lose.i foo.elc bar.o lose.o)
-all: ; @echo $(files1) $(files2)
-EOF
+all: ; @echo '$(files1) $(files2)'
+!,
+              '', "foo.elc foo.elc\n");
 
-close(MAKEFILE);
+# Escaped patterns
+run_make_test(q!all:;@echo '$(filter foo\%bar,foo%bar fooXbar)'!,
+              '', "foo%bar\n");
 
-&run_make_with_options($makefile, "", &get_logfile, 0);
-$answer = "foo.elc foo.elc\n";
-&compare_output($answer,&get_logfile(1));
+run_make_test(q!all:;@echo '$(filter foo\%\%\\\\\%\%bar,foo%%\\%%bar fooX\\Ybar)'!,
+              '', "foo%%\\%%bar\n");
+
+run_make_test(q!
+X = $(filter foo\\\\\%bar,foo\%bar foo\Xbar)
+all:;@echo '$(X)'!,
+              '', "foo\\%bar\n");
 
 1;