X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?p=subdirmk.git;a=blobdiff_plain;f=build-aux%2Fsubdirmk-setup;h=e6e30e039912fd36f5703982199d3d7cc7cad736;hp=3d8ef7d8221c7fe52f2f41bfd23457398dfd4a83;hb=e0d6429b6d8ed4c07f1dec7adeeab6984bb5c56c;hpb=e56b3172a2b14ac09c0d9a3aec433fa43c12cdc2

diff --git a/build-aux/subdirmk-setup b/build-aux/subdirmk-setup
old mode 100644
new mode 100755
index 3d8ef7d..e6e30e0
--- a/build-aux/subdirmk-setup
+++ b/build-aux/subdirmk-setup
@@ -8,11 +8,21 @@
 
 use strict;
 
+our $srcdir;
+our @subdirs = @ARGV;
+
+die unless $ARGV[0] eq '--srcdir';
+die unless @ARGV>=2;
+shift @ARGV;
+($srcdir, @subdirs) = @ARGV;
+
+s{/+$}{} foreach @subdirs;
+
 our $root = [ '.', [ ] ];
 # each node is [ 'relative subdir name', \@children ]
 
 sub build_tree () {
-    foreach my $subdir (@ARGV) {
+    foreach my $subdir (@subdirs) {
 	my @path = $subdir eq '.' ? () : split m{/+}, $subdir;
 	my $node = $root;
 	foreach my $d (@path) {
@@ -28,17 +38,53 @@ sub build_tree () {
 
 sub target_varname ($$) {
     my ($var_prefix, $target) = @_;
-    return $vprefix.'TARGETS'.($target eq 'all' ? '' : "_$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 o {
+    die unless defined $writing_output;
+    print O @_ or die "error writing $writing_output.tmp: $!\n";
+}
+
+sub start_output_file ($) {
+    close_any_output_file();
+    ($writing_output) = @_;
+    die "$writing_output ?" if $output_files{$writing_output}++;
+    my $tmp = "$writing_output.tmp";
+    open O, ">", $tmp or die "create $tmp: $!\n";
+    o "# autogenerated - do not edit\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 write_makefile ($$) {
     my ($dir_prefix,$depth) = @_;
+    #print STDERR "write_makefile @_\n";
     start_output_file("${dir_prefix}Makefile");
     my $cd = $depth ? join('/', ('..',) x $depth) : '.';
     o <<END;
 default: all
-%:
-	$(MAKE) -C $cd ${dir_prefix}$@
+	\@: \$@
+%:	FORCE-ALWAYS-RUN
+	\$(MAKE) -C $cd -f subdirs.mk ${dir_prefix}\$@
+Makefile FORCE-ALWAYS-RUN:
+	\@: \$@
+.SUFFIXES:
 END
 }
 
@@ -46,34 +92,38 @@ 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";
+    #use Data::Dumper;
+    #print STDERR "filter @_\n";
+
+    my $in = "${dir_prefix}Subdir.mk.in";
     my $caps_re = qr{[A-Z][0-9_A-Z]*(?=\W)};
-    my $lc_e = 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 my $f ($in, "Perdir.mk.in") {
+      open I, '<', $f or die "open $f: $!\n";
+      while (<I>) {
 	for (;;) {
 	    unless (s{^(.*?)(\\)?(?=$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);
+	    elsif (s{^TARGETS(?:_([0-9a-zA-Z_]+))?(?=\W)}{}) {
+		my $t = $1 // 'all';
+		o target_varname($var_prefix, $t);
 		$targets->{$t}=1;
 	    }
-	    elsif (m{^(?=$caps_re)}) { o "${var_prefix}_" }
+	    elsif (m{^(?=$caps_re)}) { o $var_prefix }
 	    elsif (m{^(?=$lc_re)}) { o $dir_prefix }
-	    elsif (s{^_}{}) { o "${var_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]){}}{}) {
+	    elsif (s{^(?:[ \t]+([~^]))?(?=[ \t])}{}) {
 		my $prefix =
 		    !$1       ? $dir_prefix                     :
 		    $1 eq '~' ? '$(abs_top_srcdir)'.$dir_suffix :
@@ -95,20 +145,26 @@ sub filter_subdir_mk ($$$$$) {
 		die "bad escape $esclit$_ ";
 	    }
 	}
+      }
+      I->error and die "read $f: $!\n";
     }
 }
 
+sub process_subtree ($$);
 sub process_subtree ($$) {
     # => list of descendants (in form SUBDIR/)
     # recursive, children first
-    my ($node, $path);
+    my ($node, $path) = @_;
+
+    #use Data::Dumper;
+    #print STDERR Dumper(\@_);
 
     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);
+    my $var_prefix = join '', map { "${_}_" } @$path ? @$path : qw(TOP);
 
-    write_makefile($subdir, scalar @$path);
+    write_makefile($dir_prefix, scalar @$path);
 
     my %targets = qw(all 1);
     my @child_subdirs;
@@ -116,26 +172,23 @@ sub process_subtree ($$) {
 	my @childpath = (@$path, $child->[0]);
 	push @child_subdirs, join '/', @childpath;
 	$targets{$_}++ foreach
-	    process_subtree($child, [  ]);
+	    process_subtree($child, \@childpath);
     }
-    start_output_file("$subdir/Subdir.mk.tmp");
+    start_output_file("${dir_prefix}Subdir.mk.tmp");
 
     filter_subdir_mk($dir_prefix, $dir_suffix, $dir_name,
 		     $var_prefix, \%targets);
 
+    o "\n";
+
     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";
+	my $target_varname = target_varname($var_prefix, $target);
+	print O "${dir_prefix}${target}: \$($target_varname)";
+	foreach my $child_subdir (@child_subdirs) {
+	    print O " $child_subdir/$target";
 	}
+	print O "\n";
     }
     
     return @targets;
@@ -143,11 +196,15 @@ END
 
 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";
+    start_output_file("subdirs.mk.tmp");
+    foreach my $v (qw(top_srcdir abs_top_srcdir)) {
+	o "$v=\@$v@\n";
+    }
+    o "MAKEFILES += Subdir.mk\n";
+    foreach my $subdir (@subdirs) {
+	o "MAKEFILES += $subdir/Subdir.mk\n";
     }
+    o "include \$(MAKEFILES)";
 }
 
 build_tree();