Added new script from Larry Doolittle that builds each applet individually.

tests/multibuild.pl

@@ -0,0 +1,51 @@
+#!/usr/bin/perl
+
+# multibuild.pl
+# Tests BusyBox-0.48 (at least) to see if each applet builds
+# properly on its own.  The most likely problems this will
+# flush out are those involving preprocessor instructions in
+# utility.c.
+
+$logfile = "multibuild.log";
+
+# Support building from pristine source
+$make_opt = "-f $ARGV[0]/Makefile BB_SRC_DIR=$ARGV[0]" if ($ARGV[0] ne "");
+
+# Move the config file to a safe place
+-e "Config.h.orig" || 0==system("mv -f Config.h Config.h.orig") || die;
+
+# Clear previous log file, if any
+unlink($logfile);
+
+# Parse the config file
+open(C,"<Config.h.orig") || die;
+while (<C>) {
+	if ($in_trailer) {
+		$trailer .= $_;
+	} else {
+		$in_trailer=1 if /End of Applications List/;
+		if (/^\/*#define BB_([A-Z_]*)/) {
+			push @apps, $1;
+		}
+	}
+}
+close C;
+
+# Do the real work ...
+for $a (@apps) {
+	# print "Testing build of applet $a ...\n";
+	open (O, ">Config.h") || die;
+	print O "#define BB_$a\n", $trailer;
+	close O;
+	system("echo -e '\n***\n$a\n***' >>$logfile");
+	# todo: figure out why the "rm -f *.o" is needed
+	$result{$a} = system("rm -f *.o; make $make_opt busybox >>$logfile 2>&1");
+	$flag = $result{$a} ? "FAIL" : "OK";
+	print "Applet $a: $flag\n";
+}
+
+# Clean up our mess
+system("mv -f Config.h.orig Config.h");
+
+print "See $logfile for details.\n";
+