3 # subdirmk - &-filter (makefile generation program)
4 # Copyright 2019 Ian Jackson
5 # SPDX-License-Identifier: LGPL-2.0-or-later
7 # $(srcdir)/subdirmk/generate [--srcdir=SRCDIR] [--] SUBDIR...
9 # generates in each subdirectory from in each subdirectory
10 # Subdir.mk.tmp Subdir.sd.mk
11 # Makefile and included files
12 # and in toplevel and in toplevel
13 # main.mk.tmp Perdir.sd.mk
18 print "$0 @ARGV\n" or die $!;
22 while (@ARGV && $ARGV[0] =~ m/^-/) {
28 die "$0: unknown option \`$_'\n";
33 s{/+$}{} foreach @subdirs;
35 our $root = [ '.', [ ], 1 ];
36 # each node is [ 'relative subdir name', \@children, $mentioned ]
39 foreach my $subdir (@subdirs) {
40 my @path = $subdir eq '.' ? () : split m{/+}, $subdir;
42 foreach my $d (@path) {
43 my ($c,) = grep { $_->[0] eq $d } @{ $node->[1] };
46 push @{ $node->[1] }, $c;
54 sub target_varname ($$) {
55 my ($var_prefix, $target) = @_;
56 return $var_prefix.'TARGETS'.($target eq 'all' ? '' : "_$target");
60 our $buffering_output;
63 our @output_makefiles;
65 sub close_any_output_file() {
66 return unless defined $writing_output;
67 O->error and die "error writing $writing_output.tmp: $! (?)\n";
68 close O or die "error closing $writing_output.tmp: $!\n";
69 $writing_output = undef;
73 if (defined $buffering_output) {
74 $buffering_output .= $_ foreach @_;
77 die unless defined $writing_output;
78 print O @_ or die "error writing $writing_output.tmp: $!\n";
81 sub start_output_file ($) {
82 close_any_output_file();
83 ($writing_output) = @_;
84 die "$writing_output ?" if $output_files{$writing_output}++;
85 my $tmp = "$writing_output.tmp";
86 open O, ">", $tmp or die "create $tmp: $!\n";
87 o "# autogenerated - do not edit\n";
90 sub install_output_files () {
91 close_any_output_file();
92 foreach my $f (sort keys %output_files) {
93 rename "$f.tmp", $f or die "install new $f: $!\n";
97 sub write_makefile ($$) {
98 my ($dir_prefix,$depth) = @_;
99 #print STDERR "write_makefile @_\n";
100 start_output_file("${dir_prefix}Makefile");
101 my $cd = $depth ? join('/', ('..',) x $depth) : '.';
102 my $suppress_templates=
103 '$(if $(filter-out clean real-clean, $(subdirmk_targets)),,'.
104 ' MAKEFILE_TEMPLATES=)';
107 \$(filter-out all,\$(MAKECMDGOALS)) all: run-main.mk
109 subdirmk_targets:=\$(or \$(MAKECMDGOALS),all)
110 Makefile run-main.mk:
111 \$(MAKE) -C $cd -f main.mk \$(addprefix ${dir_prefix},\$(subdirmk_targets))$suppress_templates
117 sub process_input_mk ($$$$$$$$$);
118 sub process_input_mk ($$$$$$$$$) {
119 my ($dir_prefix, $dir_suffix, $dir_name,
120 $var_prefix, $var_prefix_name, $targets,
121 $f, $esclitr, $enoent_ok) = @_;
123 my $caps_re = qr{[A-Z]};
124 my $lc_re = qr{[a-z]};
133 my $input = new IO::File $f, '<';
135 die "open $f: $!\n" unless $!==ENOENT && $enoent_ok;
141 '^' => "\$(top_srcdir)${dir_suffix}",
142 '~' => "\$(top_srcdir)",
147 $pfxmap{$_} = $srcdirmap{$_}.'/' foreach keys %srcdirmap;
150 if (s#^\s*$esc\:##) {
151 $buffering_output='';
154 unless (s{^(.*?)$esc}{}) { o $_; last; }
156 if (s{^\\$esc}{}) { o "$$esclitr" }
157 elsif (s{^\\\$}{}) { o '$' }
158 elsif (s{^$esc}{}) { o "$$esclitr$$esclitr" }
159 elsif (s{^TARGETS(?:_([0-9a-zA-Z_]+))?(?=\W)}{}) {
161 o target_varname($var_prefix, $t);
162 $targets->{$t} //= [ ];
164 elsif (m{^(?=$caps_re)}) { o $var_prefix }
165 elsif (s{^([~^]?)(?=$lc_re)}{}) { o $pfxmap{$1} }
166 elsif (s{^_}{}) { o $var_prefix }
167 elsif (s{^=}{}) { o $var_prefix_name }
168 elsif (s{^([~^]?)/}{}) { o $pfxmap{$1} }
169 elsif (s{^\.}{}) { o $dir_name }
170 elsif (s{^([~^])\.}{}) { o $srcdirmap{$1} }
171 elsif (s{^([~^]?)(?=[ \t])}{}) {
172 my $prefix = $pfxmap{$1} // die;
174 if (m{([ \t])$esc}) { ($_,$after) = ($`, $1.$'); }
175 s{(?<=[ \t])(?=\S)(?!\\\s*$)}{$prefix}g;
180 } elsif (s{^![ \t]+}{}) {
184 die "bad escape $$esclitr$_ ";
187 if (defined $buffering_output) {
188 $_=$buffering_output;
189 $buffering_output=undef;
190 if (m#^(-?)include\s+(\S+)\s+$#) {
191 my $subf = "$srcdir/$2";
192 process_input_mk($dir_prefix, $dir_suffix, $dir_name,
193 $var_prefix, $var_prefix_name, $targets,
194 $subf, $esclitr, $1);
196 } elsif (m#^changequote\s+(\S+)\s+$#) {
200 die "unknown directive $_ ";
204 $input->error and die "read $f: $!\n";
205 close $input or die "close $f: $!\n";
208 sub filter_subdir_mk ($$$$$$) {
209 my ($dir_prefix, $dir_suffix, $dir_name,
210 $var_prefix, $var_prefix_name, $targets) = @_;
213 #print STDERR "filter @_\n";
218 my ($f, $enoentok) = @_;
219 process_input_mk($dir_prefix, $dir_suffix, $dir_name,
220 $var_prefix, $var_prefix_name, $targets,
221 "${srcdir}/$f", \$esclit, $enoentok);
223 $pi->("${dir_prefix}Subdir.sd.mk", 0);
224 $pi->("Perdir.sd.mk", 1);
227 sub process_subtree ($$);
228 sub process_subtree ($$) {
229 # => list of descendants (in form SUBDIR/)
230 # recursive, children first
231 my ($node, $path) = @_;
234 #print STDERR Dumper(\@_);
236 my $dir_prefix = join '', map { "$_/" } @$path;
237 my $dir_suffix = join '', map { "/$_" } @$path;
238 my $dir_name = join '/', @$path ? @$path : '.';
239 my $var_prefix_name = join '_', @$path ? @$path : qw(TOP);
240 my $var_prefix = "${var_prefix_name}_";
242 push @output_makefiles, "${dir_prefix}Subdir.mk";
243 write_makefile($dir_prefix, scalar @$path);
245 my %targets = (all => []);
246 foreach my $child (@{ $node->[1] }) {
247 my @childpath = (@$path, $child->[0]);
248 my $child_subdir = join '/', @childpath;
249 mkdir $child_subdir or $!==EEXIST or die "mkdir $child_subdir: $!";
250 push @{ $targets{$_} }, $child_subdir foreach
251 process_subtree($child, \@childpath);
253 start_output_file("${dir_prefix}Subdir.mk.tmp");
256 filter_subdir_mk($dir_prefix, $dir_suffix, $dir_name,
257 $var_prefix, $var_prefix_name, \%targets);
259 my $sdmk = "${dir_prefix}Subdir.sd.mk";
261 die "$sdmk unexpectedly exists (${dir_prefix} not mentioned)";
262 } elsif ($!==ENOENT) {
264 die "stat $sdmk: $!";
270 my @targets = sort keys %targets;
271 foreach my $target (@targets) {
272 my $target_varname = target_varname($var_prefix, $target);
273 print O "${dir_prefix}${target}:: \$($target_varname)";
274 foreach my $child_subdir (@{ $targets{$target} }) {
275 print O " $child_subdir/$target";
281 print O " ${dir_prefix}${_}" foreach @targets;
289 process_subtree($root, [ ]);
290 start_output_file("main.mk.tmp");
291 foreach my $v (qw(top_srcdir abs_top_srcdir)) {
294 o "SUBDIRMK_MAKEFILES :=\n";
295 o "MAKEFILE_TEMPLATES :=\n";
296 foreach my $mf (@output_makefiles) {
297 o "SUBDIRMK_MAKEFILES += $mf\n";
299 foreach my $input (sort keys %input_files) {
300 o "MAKEFILE_TEMPLATES += $input\n";
302 o "include \$(SUBDIRMK_MAKEFILES)\n";
307 install_output_files();