2 # Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
4 # Licensed under the Apache License 2.0 (the "License"). You may not use
5 # this file except in compliance with the License. You can obtain a copy
6 # in the file LICENSE in the source distribution or at
7 # https://www.openssl.org/source/license.html
15 use File::Spec::Functions qw(:DEFAULT rel2abs);
16 use File::Compare qw(compare_text);
19 # When using stat() on Windows, we can get it to perform better by avoid some
20 # data. This doesn't affect the mtime field, so we're not losing anything...
21 ${^WIN32_SLOPPY_STAT} = 1;
23 my $debug = $ENV{ADD_DEPENDS_DEBUG};
24 my $buildfile = $config{build_file};
25 my $build_mtime = (stat($buildfile))[9];
27 my $depext = $target{dep_extension} || ".d";
31 # This grep has side effects. Not only does if check the existence
32 # of the dependency file given in $_, but it also checks if it's
33 # newer than the build file, and if it is, sets $rebuild.
35 $rebuild = 1 if @st && $st[9] > $build_mtime;
36 scalar @st > 0; # Determines the grep result
38 map { (my $x = $_) =~ s|\.o$|$depext|; $x; }
39 ( ( grep { $unified_info{sources}->{$_}->[0] =~ /\.cc?$/ }
40 keys %{$unified_info{sources}} ),
41 ( grep { $unified_info{shared_sources}->{$_}->[0] =~ /\.cc?$/ }
42 keys %{$unified_info{shared_sources}} ) );
44 exit 0 unless $rebuild;
46 # Ok, primary checks are done, time to do some real work
48 my $producer = shift @ARGV;
49 die "Producer not given\n" unless $producer;
51 my $srcdir = $config{sourcedir};
52 my $blddir = $config{builddir};
53 my $abs_srcdir = rel2abs($srcdir);
54 my $abs_blddir = rel2abs($blddir);
56 # Convenient cache of absolute to relative map. We start with filling it
57 # with mappings for the known generated header files. They are relative to
58 # the current working directory, so that's an easy task.
59 # NOTE: there's more than C header files that are generated. They will also
60 # generate entries in this map. We could of course deal with C header files
61 # only, but in case we decide to handle more than just C files in the future,
62 # we already have the mechanism in place here.
63 # NOTE2: we lower case the index to make it searchable without regard for
64 # character case. That could seem dangerous, but as long as we don't have
65 # files we depend on in the same directory that only differ by character case,
68 map { catfile($abs_blddir, $_) => $_ }
69 keys %{$unified_info{generate}};
72 'gcc' => undef, # gcc style dependency files needs no mods
75 # makedepend, in its infinite wisdom, wants to have the object file
76 # in the same directory as the source file. This doesn't work too
77 # well with out-of-source-tree builds, so we must resort to tricks
78 # to get things right. Fortunately, the .d files are always placed
79 # parallel with the object files, so all we need to do is construct
80 # the object file name from the dep file name.
81 (my $objfile = shift) =~ s|\.d$|.o|i;
85 return undef if $line =~ /^(#.*|\s*)$/;
87 # Remove the original object file
88 $line =~ s|^.*\.o: | |;
89 # Also, remove any dependency that starts with a /, because those
90 # are typically system headers
91 $line =~ s/\s+\/(\\.|\S)*//g;
92 # Finally, discard all empty lines
93 return undef if $line =~ /^\s*$/;
95 # All we got now is a dependency, just shave off surrounding spaces
98 return ($objfile, $line);
102 state $abs_srcdir_shaved = undef;
103 state $srcdir_shaved = undef;
105 unless (defined $abs_srcdir_shaved) {
106 ($abs_srcdir_shaved = $abs_srcdir) =~ s|[>\]]$||;
107 ($srcdir_shaved = $srcdir) =~ s|[>\]]$||;
110 # current versions of DEC / Compaq / HP / VSI C strips away all
111 # directory information from the object file, so we must insert it
112 # back. To make life simpler, we simply replace it with the
113 # corresponding .D file that's had its extension changed. Since
114 # .D files are always written parallel to the object files, we
115 # thereby get the directory information for free.
116 (my $objfile = shift) =~ s|\.D$|.OBJ|i;
119 # Shave off the target.
121 # The pattern for target and dependencies will always take this
124 # target SPACE : SPACE deps
126 # This is so a volume delimiter (a : without any spaces around it)
127 # won't get mixed up with the target / deps delimiter. We use this
128 # to easily identify what needs to be removed.
129 m|\s:\s|; $line = $';
131 # We know that VMS has system header files in text libraries,
132 # extension .TLB. We also know that our header files aren't stored
133 # in text libraries. Finally, we know that VMS C produces exactly
134 # one dependency per line, so we simply discard any line ending with
136 return undef if /\.TLB\s*$/;
138 # All we got now is a dependency, just shave off surrounding spaces
142 # VMS C gives us absolute paths, always. Let's see if we can
143 # make them relative instead.
144 $line = canonpath($line);
146 unless (defined $depconv_cache{$line}) {
148 # Since we have already pre-populated the cache with
149 # mappings for generated headers, we only need to deal
150 # with the source tree.
151 if ($dep =~ s|^\Q$abs_srcdir_shaved\E([\.>\]])?|$srcdir_shaved$1|i) {
152 $depconv_cache{$line} = $dep;
155 return ($objfile, $depconv_cache{$line})
156 if defined $depconv_cache{$line};
157 print STDERR "DEBUG[VMS C]: ignoring $objfile <- $line\n"
164 # For the moment, we only support Visual C on native Windows, or
165 # compatible compilers. With those, the flags /Zs /showIncludes
166 # give us the necessary output to be able to create dependencies
167 # that nmake (or any 'make' implementation) should be able to read,
168 # with a bit of help. The output we're interested in looks like
169 # this (it always starts the same)
171 # Note: including file: {whatever header file}
173 # Since there's no object file name at all in that information,
174 # we must construct it ourselves.
176 (my $objfile = shift) =~ s|\.d$|.obj|i;
179 # There are also other lines mixed in, for example compiler
180 # warnings, so we simply discard anything that doesn't start with
183 if (/^Note: including file: */) {
184 (my $tail = $') =~ s/\s*\R$//;
186 # VC gives us absolute paths for all include files, so to
187 # remove system header dependencies, we need to check that
188 # they don't match $abs_srcdir or $abs_blddir.
189 $tail = canonpath($tail);
191 unless (defined $depconv_cache{$tail}) {
193 # Since we have already pre-populated the cache with
194 # mappings for generated headers, we only need to deal
195 # with the source tree.
196 if ($dep =~ s|^\Q$abs_srcdir\E\\|\$(SRCDIR)\\|i) {
197 $depconv_cache{$tail} = $dep;
200 return ($objfile, '"'.$depconv_cache{$tail}.'"')
201 if defined $depconv_cache{$tail};
202 print STDERR "DEBUG[VC]: ignoring $objfile <- $tail\n"
209 my %continuations = (
211 'makedepend' => "\\",
216 die "Producer unrecognised: $producer\n"
217 unless exists $procedures{$producer} && exists $continuations{$producer};
219 my $procedure = $procedures{$producer};
220 my $continuation = $continuations{$producer};
222 my $buildfile_new = "$buildfile-$$";
225 if (defined $procedure) {
226 foreach my $depfile (@depfiles) {
227 open IDEP,$depfile or die "Trying to read $depfile: $!\n";
229 s|\R$||; # The better chomp
230 my ($target, $deps) = $procedure->($depfile, $_);
231 $collect{$target}->{$deps} = 1 if defined $target;
237 open IBF, $buildfile or die "Trying to read $buildfile: $!\n";
238 open OBF, '>', $buildfile_new or die "Trying to write $buildfile_new: $!\n";
240 last if /^# DO NOT DELETE THIS LINE/;
241 print OBF or die "$!\n";
245 print OBF "# DO NOT DELETE THIS LINE -- make depend depends on it.\n";
247 if (defined $procedure) {
248 foreach my $target (sort keys %collect) {
249 my $prefix = $target . ' :';
250 my @deps = sort keys %{$collect{$target}};
256 while (@deps && ($buf eq ''
257 || length($buf) + length($deps[0]) <= 77)) {
258 $buf .= ' ' . shift @deps;
260 $buf .= ' '.$continuation if @deps;
262 print OBF $buf,"\n" or die "Trying to print: $!\n"
266 foreach my $depfile (@depfiles) {
267 open IDEP,$depfile or die "Trying to read $depfile: $!\n";
269 print OBF or die "Trying to print: $!\n";
277 if (compare_text($buildfile_new, $buildfile) != 0) {
278 rename $buildfile_new, $buildfile
279 or die "Trying to rename $buildfile_new -> $buildfile: $!\n";
283 # On VMS, we want to remove all generations of this file, in case there
284 # are more than one, so we loop.
285 if (defined $buildfile_new) {
286 while (unlink $buildfile_new) {}