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 ($$) {
55 my ($var_prefix, $target) = @_;
56 return $var_prefix.'TARGETS'.($target eq 'all' ? '' : "_$target");
60 our $buffering_output;
64 sub close_any_output_file() {
65 return unless defined $writing_output;
66 O->error and die "error writing $writing_output.tmp: $! (?)\n";
67 close O or die "error closing $writing_output.tmp: $!\n";
68 $writing_output = undef;
72 if (defined $buffering_output) {
73 $buffering_output .= $_ foreach @_;
76 die unless defined $writing_output;
77 print O @_ or die "error writing $writing_output.tmp: $!\n";
80 sub start_output_file ($) {
81 close_any_output_file();
82 ($writing_output) = @_;
83 die "$writing_output ?" if $output_files{$writing_output}++;
84 my $tmp = "$writing_output.tmp";
85 open O, ">", $tmp or die "create $tmp: $!\n";
86 o "# autogenerated - do not edit\n";
89 sub install_output_files () {
90 close_any_output_file();
91 foreach my $f (sort keys %output_files) {
92 rename "$f.tmp", $f or die "install new $f: $!\n";
96 sub write_makefile ($$) {
97 my ($dir_prefix,$depth) = @_;
98 #print STDERR "write_makefile @_\n";
99 start_output_file("${dir_prefix}Makefile");
100 my $cd = $depth ? join('/', ('..',) x $depth) : '.';
101 my $suppress_templates=
102 '$(if $(filter-out clean real-clean, $(subdirmk_targets)),,'.
103 ' MAKEFILE_TEMPLATES=)';
106 \$(filter-out all,\$(MAKECMDGOALS)) all: run-main.mk
108 subdirmk_targets:=\$(or \$(MAKECMDGOALS),all)
109 Makefile run-main.mk:
110 \$(MAKE) -C $cd -f main.mk \$(addprefix ${dir_prefix},\$(subdirmk_targets))$suppress_templates
116 sub process_input_mk ($$$$$$$$);
117 sub process_input_mk ($$$$$$$$) {
118 my ($dir_prefix, $dir_suffix, $dir_name,
119 $var_prefix, $targets,
120 $f, $esclitr, $enoent_ok) = @_;
122 my $caps_re = qr{[A-Z]};
123 my $lc_re = qr{[a-z]};
132 my $input = new IO::File $f, '<';
134 die "open $f: $!\n" unless $!==ENOENT && $enoent_ok;
141 '^' => "\$(top_srcdir)${dir_suffix}/",
142 '~' => "\$(top_srcdir)/",
146 if (s#^\s*$esc\:##) {
147 $buffering_output='';
150 unless (s{^(.*?)(\\)?(?=$esc)}{}) { o $_; last; }
152 if ($2) { s#^$esc##; o $$esclitr; next; }
153 s{^$esc}{} or die "$_ ?";
154 if (s{^$esc}{}) { o "$$esclitr$$esclitr" }
155 elsif (s{^TARGETS(?:_([0-9a-zA-Z_]+))?(?=\W)}{}) {
157 o target_varname($var_prefix, $t);
158 $targets->{$t} //= [ ];
160 elsif (m{^(?=$caps_re)}) { o $var_prefix }
161 elsif (s{^([~^]?)(?=$lc_re)}{}) { o $pfxmap{$1} }
162 elsif (s{^_}{}) { o $var_prefix }
163 elsif (s{^=_}{}) { o $var_prefix }
164 elsif (s{^([~^]?)/}{}) { o $pfxmap{$1} }
165 elsif (s{^=/}{}) { o $dir_name }
166 elsif (s{^([~^]?)(?=[ \t])}{}) {
167 my $prefix = $pfxmap{$1} // die;
169 if (m{([ \t])$esc}) { ($_,$after) = ($`, $1.$'); }
170 s{(?<=[ \t])(?=\S)(?!\\\s*$)}{$prefix}g;
175 } elsif (s{^![ \t]+}{}) {
178 } elsif (s{^!(\S+)(?:[ \t]+|$)}{}) {
182 die "bad escape $$esclitr$_ ";
185 if (defined $buffering_output) {
186 $_=$buffering_output;
187 $buffering_output=undef;
188 if (m#^(-?)include\s+(\S+)\s+$#) {
189 my $subf = "$srcdir/$2";
190 process_input_mk($dir_prefix, $dir_suffix, $dir_name,
191 $var_prefix, $targets,
192 $subf, $esclitr, $1);
195 die "unknown directive $_ ";
199 $input->error and die "read $f: $!\n";
200 close $input or die "close $f: $!\n";
203 sub filter_subdir_mk ($$$$$) {
204 my ($dir_prefix, $dir_suffix, $dir_name,
205 $var_prefix, $targets) = @_;
208 #print STDERR "filter @_\n";
213 my ($f, $enoentok) = @_;
214 process_input_mk($dir_prefix, $dir_suffix, $dir_name,
215 $var_prefix, $targets,
216 "${srcdir}/$f", \$esclit, $enoentok);
218 $pi->("${dir_prefix}Subdir.sd.mk", 0);
219 $pi->("Perdir.sd.mk", 1);
222 sub process_subtree ($$);
223 sub process_subtree ($$) {
224 # => list of descendants (in form SUBDIR/)
225 # recursive, children first
226 my ($node, $path) = @_;
229 #print STDERR Dumper(\@_);
231 my $dir_prefix = join '', map { "$_/" } @$path;
232 my $dir_suffix = join '', map { "/$_" } @$path;
233 my $dir_name = join '/', @$path ? @$path : '.';
234 my $var_prefix = join '', map { "${_}_" } @$path ? @$path : qw(TOP);
236 write_makefile($dir_prefix, scalar @$path);
238 my %targets = (all => []);
239 foreach my $child (@{ $node->[1] }) {
240 my @childpath = (@$path, $child->[0]);
241 my $child_subdir = join '/', @childpath;
242 mkdir $child_subdir or $!==EEXIST or die "mkdir $child_subdir: $!";
243 push @{ $targets{$_} }, $child_subdir foreach
244 process_subtree($child, \@childpath);
246 start_output_file("${dir_prefix}Subdir.mk.tmp");
249 filter_subdir_mk($dir_prefix, $dir_suffix, $dir_name,
250 $var_prefix, \%targets);
252 my $sdmk = "${dir_prefix}Subdir.sd.mk";
254 die "$sdmk unexpectedly exists (${dir_prefix} not mentioned)";
255 } elsif ($!==ENOENT) {
257 die "stat $sdmk: $!";
263 my @targets = sort keys %targets;
264 foreach my $target (@targets) {
265 my $target_varname = target_varname($var_prefix, $target);
266 print O "${dir_prefix}${target}:: \$($target_varname)";
267 foreach my $child_subdir (@{ $targets{$target} }) {
268 print O " $child_subdir/$target";
274 print O " ${dir_prefix}${_}" foreach @targets;
282 process_subtree($root, [ ]);
283 start_output_file("main.mk.tmp");
284 foreach my $v (qw(top_srcdir abs_top_srcdir)) {
287 o "SUBDIRMK_MAKEFILES :=\n";
288 o "MAKEFILE_TEMPLATES :=\n";
289 o "SUBDIRMK_MAKEFILES += Subdir.mk\n";
290 foreach my $subdir (@subdirs) {
291 o "SUBDIRMK_MAKEFILES += $subdir/Subdir.mk\n";
293 foreach my $input (sort keys %input_files) {
294 o "MAKEFILE_TEMPLATES += $input\n";
296 o "include \$(SUBDIRMK_MAKEFILES)\n";
301 install_output_files();