2 # Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
4 # Licensed under the OpenSSL license (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);
18 # When using stat() on Windows, we can get it to perform better by avoid some
19 # data. This doesn't affect the mtime field, so we're not losing anything...
20 ${^WIN32_SLOPPY_STAT} = 1;
22 my $debug = $ENV{ADD_DEPENDS_DEBUG};
23 my $buildfile = $config{build_file};
24 my $build_mtime = (stat($buildfile))[9];
26 my $depext = $target{dep_extension} || ".d";
30 # This grep has side effects. Not only does if check the existence
31 # of the dependency file given in $_, but it also checks if it's
32 # newer than the build file, and if it is, sets $rebuild.
34 $rebuild = 1 if @st && $st[9] > $build_mtime;
35 scalar @st > 0; # Determines the grep result
37 map { (my $x = $_) =~ s|\.o$|$depext|; $x; }
38 grep { $unified_info{sources}->{$_}->[0] =~ /\.cc?$/ }
39 keys %{$unified_info{sources}};
41 exit 0 unless $rebuild;
43 # Ok, primary checks are done, time to do some real work
45 my $producer = shift @ARGV;
46 die "Producer not given\n" unless $producer;
48 my $abs_srcdir = rel2abs($config{sourcedir});
49 my $abs_blddir = rel2abs($config{builddir});
51 # Convenient cache of absolute to relative map. We start with filling it
52 # with mappings for the known generated header files. They are relative to
53 # the current working directory, so that's an easy task.
54 # NOTE: there's more than C header files that are generated. They will also
55 # generate entries in this map. We could of course deal with C header files
56 # only, but in case we decide to handle more than just C files in the future,
57 # we already have the mechanism in place here.
58 # NOTE2: we lower case the index to make it searchable without regard for
59 # character case. That could seem dangerous, but as long as we don't have
60 # files we depend on in the same directory that only differ by character case,
63 map { lc catfile($abs_blddir, $_) => $_ }
64 keys %{$unified_info{generate}};
67 'gcc' => undef, # gcc style dependency files needs no mods
70 # makedepend, in its infinite wisdom, wants to have the object file
71 # in the same directory as the source file. This doesn't work too
72 # well with out-of-source-tree builds, so we must resort to tricks
73 # to get things right. Fortunately, the .d files are always placed
74 # parallel with the object files, so all we need to do is construct
75 # the object file name from the dep file name.
76 (my $objfile = shift) =~ s|\.d$|.o|i;
80 return undef if $line =~ /^(#.*|\s*)$/;
82 # Remove the original object file
83 $line =~ s|^.*\.o: | |;
84 # Also, remove any dependency that starts with a /, because those
85 # are typically system headers
86 $line =~ s/\s+\/(\\.|\S)*//g;
87 # Finally, discard all empty lines
88 return undef if $line =~ /^\s*$/;
90 # All we got now is a dependency, just shave off surrounding spaces
93 return ($objfile, $line);
97 # current versions of DEC / Compaq / HP / VSI C strips away all
98 # directory information from the object file, so we must insert it
99 # back. To make life simpler, we simply replace it with the
100 # corresponding .D file that's had its extension changed. Since
101 # .D files are always written parallel to the object files, we
102 # thereby get the directory information for free.
103 (my $objfile = shift) =~ s|\.D$|.OBJ|i;
106 # Shave off the target.
108 # The pattern for target and dependencies will always take this
111 # target SPACE : SPACE deps
113 # This is so a volume delimiter (a : without any spaces around it)
114 # won't get mixed up with the target / deps delimiter. We use this
115 # to easily identify what needs to be removed.
116 m|\s:\s|; $line = $';
118 # We know that VMS has system header files in text libraries,
119 # extension .TLB. We also know that our header files aren't stored
120 # in text libraries. Finally, we know that VMS C produces exactly
121 # one dependency per line, so we simply discard any line ending with
123 return undef if /\.TLB\s*$/;
125 # All we got now is a dependency, just shave off surrounding spaces
128 return ($objfile, $line);
132 # For the moment, we only support Visual C on native Windows, or
133 # compatible compilers. With those, the flags /Zs /showIncludes
134 # give us the necessary output to be able to create dependencies
135 # that nmake (or any 'make' implementation) should be able to read,
136 # with a bit of help. The output we're interested in looks like
137 # this (it always starts the same)
139 # Note: including file: {whatever header file}
141 # Since there's no object file name at all in that information,
142 # we must construct it ourselves.
144 (my $objfile = shift) =~ s|\.d$|.obj|i;
147 # There are also other lines mixed in, for example compiler
148 # warnings, so we simply discard anything that doesn't start with
151 if (/^Note: including file: */) {
152 (my $tail = $') =~ s/\s*\R$//;
154 # VC gives us absolute paths for all include files, so to
155 # remove system header dependencies, we need to check that
156 # they don't match $abs_srcdir or $abs_blddir.
157 $tail = lc canonpath($tail);
159 unless (defined $depconv_cache{$tail}) {
161 # Since we have already pre-populated the cache with
162 # mappings for generated headers, we only need to deal
163 # with the source tree.
164 if ($dep =~ s|^\Q$abs_srcdir\E\\|\$(SRCDIR)\\|i) {
165 $depconv_cache{$tail} = $dep;
168 return ($objfile, '"'.$depconv_cache{$tail}.'"')
169 if defined $depconv_cache{$tail};
170 print STDERR "DEBUG[VC]: ignoring $objfile <- $tail\n"
177 my %continuations = (
179 'makedepend' => "\\",
184 die "Producer unrecognised: $producer\n"
185 unless exists $procedures{$producer} && exists $continuations{$producer};
187 my $procedure = $procedures{$producer};
188 my $continuation = $continuations{$producer};
190 my $buildfile_new = "$buildfile-$$";
193 if (defined $procedure) {
194 foreach my $depfile (@depfiles) {
195 open IDEP,$depfile or die "Trying to read $depfile: $!\n";
197 s|\R$||; # The better chomp
198 my ($target, $deps) = $procedure->($depfile, $_);
199 $collect{$target}->{$deps} = 1 if defined $target;
205 open IBF, $buildfile or die "Trying to read $buildfile: $!\n";
206 open OBF, '>', $buildfile_new or die "Trying to write $buildfile_new: $!\n";
208 last if /^# DO NOT DELETE THIS LINE/;
209 print OBF or die "$!\n";
213 print OBF "# DO NOT DELETE THIS LINE -- make depend depends on it.\n";
215 if (defined $procedure) {
216 foreach my $target (sort keys %collect) {
217 my $prefix = $target . ' :';
218 my @deps = sort keys %{$collect{$target}};
224 while (@deps && ($buf eq ''
225 || length($buf) + length($deps[0]) <= 77)) {
226 $buf .= ' ' . shift @deps;
228 $buf .= ' '.$continuation if @deps;
230 print OBF $buf,"\n" or die "Trying to print: $!\n"
234 foreach my $depfile (@depfiles) {
235 open IDEP,$depfile or die "Trying to read $depfile: $!\n";
237 print OBF or die "Trying to print: $!\n";
245 if (compare_text($buildfile_new, $buildfile) != 0) {
246 rename $buildfile_new, $buildfile
247 or die "Trying to rename $buildfile_new -> $buildfile: $!\n";
251 # On VMS, we want to remove all generations of this file, in case there
252 # are more than one, so we loop.
253 if (defined $buildfile_new) {
254 while (unlink $buildfile_new) {}