X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?p=subdirmk.git;a=blobdiff_plain;f=build-aux%2Fsubdirmk-setup;h=616f6530f653ddec6e44ad5cb66261feda2f5dfb;hp=9f3c8c62a43ae7858af834a8595db26e7c245d38;hb=1dec8023efc8ce858935f96a09f84d97e69eba77;hpb=3fc89ce9c0395620a92340e8290c18e156ca367e

diff --git a/build-aux/subdirmk-setup b/build-aux/subdirmk-setup
old mode 100644
new mode 100755
index 9f3c8c6..616f653
--- a/build-aux/subdirmk-setup
+++ b/build-aux/subdirmk-setup
@@ -8,25 +8,187 @@
 
 use strict;
 
-our @allsubdirs = @ARGV;
+our $srcdir;
+our @subdirs = @ARGV;
 
-sub write_makefile () {
-    start_output_file("Makefile");
-    print O <<END;
+die unless $ARGV[0] eq '--srcdir';
+die unless @ARGV>=2;
+shift @ARGV;
+($srcdir, @subdirs) = @ARGV;
+
+our $root = [ '.', [ ] ];
+# each node is [ 'relative subdir name', \@children ]
+
+sub build_tree () {
+    foreach my $subdir (@subdirs) {
+	my @path = $subdir eq '.' ? () : split m{/+}, $subdir;
+	my $node = $root;
+	foreach my $d (@path) {
+	    my ($c,) = grep { $_->[0] eq $d } @{ $node->[1] };
+	    if (!$c) {
+		$c = [ $d, [ ] ];
+		push @{ $node->[1] }, $c;
+	    }
+	    $node = $c;
+	}
+    }
+}
+
+sub target_varname ($$) {
+    my ($var_prefix, $target) = @_;
+    return $var_prefix.'TARGETS'.($target eq 'all' ? '' : "_$target");
+}
+
+our $writing_output;
+our %output_files;
+
+sub close_any_output_file() {
+    return unless defined $writing_output;
+    O->error and die "error writing $writing_output.tmp: $! (?)\n";
+    close O or die "error closing $writing_output.tmp: $!\n";
+    $writing_output = undef;
+}
+
+sub start_output_file ($) {
+    close_any_output_file();
+    ($writing_output) = @_;
+    die if $output_files{$writing_output}++;
+    my $tmp = "$writing_output.tmp";
+    open O, ">", $tmp or die "create $tmp: $!\n";
+}
+
+sub install_output_files () {
+    close_any_output_file();
+    foreach my $f (sort keys %output_files) {
+	rename "$f.tmp", $f or die "install new $f: $!\n";
+    }
+}
+
+sub o {
+    die unless defined $writing_output;
+    print O @_ or die "error writing $writing_output.tmp: $!\n";
+}
+
+sub write_makefile ($$) {
+    my ($dir_prefix,$depth) = @_;
+    start_output_file("${dir_prefix}Makefile");
+    my $cd = $depth ? join('/', ('..',) x $depth) : '.';
+    o <<END;
+default: all
 %:
-	$(MAKE) -C @top $subdir/$@
+	\$(MAKE) -C $cd ${dir_prefix}$@
 END
+}
+
+sub filter_subdir_mk ($$$$$) {
+    my ($dir_prefix, $dir_suffix, $dir_name,
+	$var_prefix, $targets) = @_;
+
+    my $in = "${srcdir}/${dir_prefix}Subdir.mk.in";
+    open I, '<', $in or die "open $in: $!\n";
+    my $caps_re = qr{[A-Z][0-9_A-Z]*(?=\W)};
+    my $lc_re = qr{[a-z][-+,0-9_a-z]*(?=\W)};
+    my $esclit = '&';
+    my $esc = '\\&';
+
+    while (<I>) {
+	for (;;) {
+	    unless (s{^(.*?)(\\)?(?=$esc)}{}) { o $_; last; }
+	    o $1;
+	    if ($2) { o $esclit; next; }
+	    s{^$esc}{} or die "$_ ?";
+	    if (s{^$esc}{}) { o "$esclit$esclit" }
+	    elsif (s{^TARGETS(?:_[0-9a-zA-Z_]+)?(?=\W)}{}) {
+		my $t = $2 // 'all';
+		o target_varname($var_prefix, $t);
+		$targets->{$t}=1;
+	    }
+	    elsif (m{^(?=$caps_re)}) { o "${var_prefix}_" }
+	    elsif (m{^(?=$lc_re)}) { o $dir_prefix }
+	    elsif (s{^_}{}) { o "${var_prefix}_" }
+	    elsif (s{^/}{}) { o $dir_prefix }
+	    elsif (s{^=_}{}) { o $var_prefix }
+	    elsif (s{^=/}{}) { o $dir_name }
+	    elsif (s{^\^}{}) { o "\$(top_srcdir)${dir_suffix}" }
+	    elsif (s{^\}}{}) { o "\$(abs_top_srcdir)${dir_suffix}" }
+	    elsif (s{^(?:[ \t]+([~^]))?(?=[ \t]){}}{}) {
+		my $prefix =
+		    !$1       ? $dir_prefix                     :
+		    $1 eq '~' ? '$(abs_top_srcdir)'.$dir_suffix :
+		    $1 eq '~' ? '$(abs_top_srcdir)'.$dir_suffix :
+		    die;
+		my $after='';
+		if (m{([ \t])$esc}) { ($_,$after) = ($`, $1.$'); }
+		s{(?<=[ \t])(?=\S)(?!\\\s*$)}{$prefix}g;
+		o $_;
+		$_ = $after;
+	    } elsif (s{^![ \t]+}{}) {
+		o $_;
+		$_ = '';
+	    } elsif (s{^!(\pPosixWord+|\pPosixPunct+)[ \t]*}{}) {
+		$esclit = $1;
+		$esc = $esclit;
+		$esc =~ s/\W/\\$&/g;
+	    } else {
+		die "bad escape $esclit$_ ";
+	    }
+	}
+    }
+}
 
-    my @thesedirs = $subdir, grep { $_ =~ m{^$subdir/} } @allsubdirs;
-    printf O "include $_/Subdir.mk"
-	
+sub process_subtree ($$);
+sub process_subtree ($$) {
+    # => 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($dir_prefix, scalar @$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($child, [  ]);
+    }
+    start_output_file("${dir_prefix}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, $target);
+	print O <<END;
+${dir_prefix}${target}: \$($target_varname)
+END
+	if (@child_subdirs) {
+	    print O "${dir_prefix}${target}:";
+	    foreach my $child_subdir (@child_subdirs) {
+		print O " $child_subdir/$target";
+	    }
+	    print O "\n";
+	}
+    }
+    
+    return @targets;
+}
 
-sub process_subdir ($$) {
-    my ($subdir) = @_;
-    my $d
-    write_makefile($subdir);
-    filter_subdir_mk();
+sub process_tree() {
+    process_subtree($root, [ ]);
+    start_output_file("subdirs.mk");
+    o "include Subdir.mk\n";
+    foreach my $subdir (@subdirs) {
+	o "include $subdir/Subdir.mk";
+    }
 }
 
-foreach (@allsubdirs) { process_subdir($_); }
+build_tree();
+process_tree();
+install_output_files();