WIP

[subdirmk.git] / build-aux / subdirmk-setup

diff --git a/build-aux/subdirmk-setup b/build-aux/subdirmk-setup
index c1866f6bcb29ae5f48858a6c3353e691972046dd..3d8ef7d8221c7fe52f2f41bfd23457398dfd4a83 100644 (file)
--- a/build-aux/subdirmk-setup
+++ b/build-aux/subdirmk-setup
@@ -26,23 +26,130 @@ sub build_tree () {
     }
 }
 
-
+sub target_varname ($$) {
+    my ($var_prefix, $target) = @_;
+    return $vprefix.'TARGETS'.($target eq 'all' ? '' : "_$target");
+}
 
 sub write_makefile ($$) {
-    my ($subdir,$depth) = @_;
-    start_output_file("Makefile");
+    my ($dir_prefix,$depth) = @_;
+    start_output_file("${dir_prefix}Makefile");
     my $cd = $depth ? join('/', ('..',) x $depth) : '.';
-    print O <<END;
+    o <<END;
+default: all
 %:
-       $(MAKE) -C $cd $subdir/$@
+       $(MAKE) -C $cd ${dir_prefix}$@
+END
+}
+
+sub filter_subdir_mk ($$$$$) {
+    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_e = 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 (m{^TARGETS(?:_[0-9a-zA-Z_]+)?(?=\W)}{}) {
+               my $t = $2 // 'all';
+               o target_varname($varname_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$_ ";
+           }
+       }
+    }
+}
+
+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;
 }
 
-sub process_subdir ($$) {
-    my ($subdir) = @_;
-    my $depth = $subdir eq '.' ? 0 : scalar split m{/+}, $subdir;
-    write_makefile($subdir,$depth);
-    filter_subdir_mk();
+sub process_tree() {
+    process_subtree($root, [ ]);
+    start_output_file("subdirs.mk");
+    o "include Subdir.mk\n";
+    foreach my $subdir (@ARGV) {
+       o "include $subdir/Subdir.mk";
+    }
 }
 
 build_tree();
+process_tree();
+install_output_files();