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 ($$$$$$$$$);
118 sub process_input_mk ($$$$$$$$$) {
119 my ($dir_prefix, $dir_suffix, $dir_name,
120 $var_prefix, $var_prefix_name, $targets,
121 $f, $esclitr, $enoent_ok) = @_;
123 my $caps_re = qr{[A-Z]};
124 my $lc_re = qr{[a-z]};
133 my $input = new IO::File $f, '<';
135 die "open $f: $!\n" unless $!==ENOENT && $enoent_ok;
141 '^' => "\$(top_srcdir)${dir_suffix}",
142 '~' => "\$(top_srcdir)",
147 $pfxmap{$_} = $srcdirmap{$_}.'/' foreach keys %srcdirmap;
150 if (s#^\s*$esc\:changequote\s+(\S+)\s+$##) {
154 } elsif (s#^\s*$esc\:(?=(-?)include)##) {
155 $buffering_output='';
156 } elsif (m#^\s*$esc\:([a-z][-0-9a-z_]*)#) {
157 die "unknown directive $1";
160 unless (s{^(.*?)$esc}{}) { o $_; last; }
162 if (s{^\\$esc}{}) { o "$$esclitr" }
163 elsif (s{^\\\$}{}) { o '$' }
164 elsif (s{^$esc}{}) { o "$$esclitr$$esclitr" }
165 elsif (s{^TARGETS(?:_([0-9a-zA-Z_]+))?(?=\W)}{}) {
167 o target_varname($var_prefix, $t);
168 $targets->{$t} //= [ ];
170 elsif (m{^(?=$caps_re)}) { o $var_prefix }
171 elsif (s{^\$([A-Za-z]\w+)}{}) { o "\$(${var_prefix}$1)" }
172 elsif (s{^([~^]?)(?=$lc_re)}{}) { o $pfxmap{$1} }
173 elsif (s{^_}{}) { o $var_prefix }
174 elsif (s{^=}{}) { o $var_prefix_name }
175 elsif (s{^([~^]?)/}{}) { o $pfxmap{$1} }
176 elsif (s{^\.}{}) { o $dir_name }
177 elsif (s{^([~^])\.}{}) { o $srcdirmap{$1} }
178 elsif (s{^([~^]?)(?=[ \t])}{}) {
179 my $prefix = $pfxmap{$1} // die;
181 if (m{([ \t])$esc}) { ($_,$after) = ($`, $1.$'); }
182 s{(?<=[ \t])(?=\S)(?!\\\s*$)}{$prefix}g;
187 } elsif (s{^![ \t]+}{}) {
191 die "bad escape $$esclitr$_ ";
194 if (defined $buffering_output) {
195 $_=$buffering_output;
196 $buffering_output=undef;
197 if (m#^(-?)include\s+(\S+)\s+$#) {
198 my $subf = "$srcdir/$2";
199 process_input_mk($dir_prefix, $dir_suffix, $dir_name,
200 $var_prefix, $var_prefix_name, $targets,
201 $subf, $esclitr, $1);
204 die "internal error buffering directive $_ ";
208 $input->error and die "read $f: $!\n";
209 close $input or die "close $f: $!\n";
212 sub filter_subdir_mk ($$$$$$) {
213 my ($dir_prefix, $dir_suffix, $dir_name,
214 $var_prefix, $var_prefix_name, $targets) = @_;
217 #print STDERR "filter @_\n";
222 my ($f, $enoentok) = @_;
223 process_input_mk($dir_prefix, $dir_suffix, $dir_name,
224 $var_prefix, $var_prefix_name, $targets,
225 "${srcdir}/$f", \$esclit, $enoentok);
227 $pi->("${dir_prefix}Subdir.sd.mk", 0);
228 $pi->("Perdir.sd.mk", 1);
231 sub process_subtree ($$);
232 sub process_subtree ($$) {
233 # => list of descendants (in form SUBDIR/)
234 # recursive, children first
235 my ($node, $path) = @_;
238 #print STDERR Dumper(\@_);
240 my $dir_prefix = join '', map { "$_/" } @$path;
241 my $dir_suffix = join '', map { "/$_" } @$path;
242 my $dir_name = join '/', @$path ? @$path : '.';
243 my $var_prefix_name = join '_', @$path ? @$path : qw(TOP);
244 my $var_prefix = "${var_prefix_name}_";
246 push @output_makefiles, "${dir_prefix}Subdir.mk";
247 write_makefile($dir_prefix, scalar @$path);
249 my %targets = (all => []);
250 foreach my $child (@{ $node->[1] }) {
251 my @childpath = (@$path, $child->[0]);
252 my $child_subdir = join '/', @childpath;
253 mkdir $child_subdir or $!==EEXIST or die "mkdir $child_subdir: $!";
254 push @{ $targets{$_} }, $child_subdir foreach
255 process_subtree($child, \@childpath);
257 start_output_file("${dir_prefix}Subdir.mk.tmp");
260 filter_subdir_mk($dir_prefix, $dir_suffix, $dir_name,
261 $var_prefix, $var_prefix_name, \%targets);
263 my $sdmk = "${dir_prefix}Subdir.sd.mk";
265 die "$sdmk unexpectedly exists (${dir_prefix} not mentioned)";
266 } elsif ($!==ENOENT) {
268 die "stat $sdmk: $!";
274 my @targets = sort keys %targets;
275 foreach my $target (@targets) {
276 my $target_varname = target_varname($var_prefix, $target);
277 print O "${dir_prefix}${target}:: \$($target_varname)";
278 foreach my $child_subdir (@{ $targets{$target} }) {
279 print O " $child_subdir/$target";
285 print O " ${dir_prefix}${_}" foreach @targets;
293 process_subtree($root, [ ]);
294 start_output_file("main.mk.tmp");
295 foreach my $v (qw(top_srcdir abs_top_srcdir)) {
298 o "SUBDIRMK_MAKEFILES :=\n";
299 o "MAKEFILE_TEMPLATES :=\n";
300 foreach my $mf (@output_makefiles) {
301 o "SUBDIRMK_MAKEFILES += $mf\n";
303 foreach my $input (sort keys %input_files) {
304 o "MAKEFILE_TEMPLATES += $input\n";
306 o "include \$(SUBDIRMK_MAKEFILES)\n";
311 install_output_files();