+sub process_subtree ($$) {
+ # => list of descendants (in form SUBDIR/)
+ # recursive, children first
+ my ($node, $path);
+
+ my $dir_prefix = join '', map { "$_/" } @$path;
+ my $dir_suffix = join '', map { "/$_" } @$path;
+ my $dir_name = join '/', @$path ? @$path : '.';
+ my $var_prefix = map { "${_}_" } @$path ? @$path : qw(TOP);
+
+ write_makefile($subdir, scalar @$path);
+
+ my %targets = qw(all 1);
+ my @child_subdirs;
+ foreach my $child (@{ $node->[1] }) {
+ my @childpath = (@$path, $child->[0]);
+ push @child_subdirs, join '/', @childpath;
+ $targets{$_}++ foreach
+ process_subtree($child, [ ]);
+ }
+ start_output_file("$subdir/Subdir.mk.tmp");
+
+ filter_subdir_mk($dir_prefix, $dir_suffix, $dir_name,
+ $var_prefix, \%targets);
+
+ my @targets = sort keys %targets;
+ foreach my $target (@targets) {
+ my $target_varname = target_varname($var_prefix, target);
+ print O <<END;
+${dprefix}${target}: \$($target_varname)
+END
+ if (@child_subdirs) {
+ print O "${dprefix}${target}:";
+ foreach my $child_subdir (@child_subdirs) {
+ print O " $child_subdir/$target";
+ }
+ print O "\n";
+ }
+ }
+
+ return @targets;
+}