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288 lines
11 KiB
Perl
288 lines
11 KiB
Perl
#! /usr/bin/env perl
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# Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
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#
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# Licensed under the OpenSSL license (the "License"). You may not use
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# this file except in compliance with the License. You can obtain a copy
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# in the file LICENSE in the source distribution or at
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# https://www.openssl.org/source/license.html
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use strict;
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use warnings;
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use lib '.';
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use configdata;
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use File::Spec::Functions qw(:DEFAULT rel2abs);
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use File::Compare qw(compare_text);
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use feature 'state';
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# When using stat() on Windows, we can get it to perform better by avoid some
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# data. This doesn't affect the mtime field, so we're not losing anything...
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${^WIN32_SLOPPY_STAT} = 1;
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my $debug = $ENV{ADD_DEPENDS_DEBUG};
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my $buildfile = $config{build_file};
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my $build_mtime = (stat($buildfile))[9];
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my $rebuild = 0;
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my $depext = $target{dep_extension} || ".d";
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my @depfiles =
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sort
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grep {
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# This grep has side effects. Not only does if check the existence
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# of the dependency file given in $_, but it also checks if it's
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# newer than the build file, and if it is, sets $rebuild.
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my @st = stat($_);
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$rebuild = 1 if @st && $st[9] > $build_mtime;
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scalar @st > 0; # Determines the grep result
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}
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map { (my $x = $_) =~ s|\.o$|$depext|; $x; }
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( ( grep { $unified_info{sources}->{$_}->[0] =~ /\.cc?$/ }
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keys %{$unified_info{sources}} ),
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( grep { $unified_info{shared_sources}->{$_}->[0] =~ /\.cc?$/ }
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keys %{$unified_info{shared_sources}} ) );
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exit 0 unless $rebuild;
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# Ok, primary checks are done, time to do some real work
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my $producer = shift @ARGV;
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die "Producer not given\n" unless $producer;
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my $srcdir = $config{sourcedir};
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my $blddir = $config{builddir};
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my $abs_srcdir = rel2abs($srcdir);
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my $abs_blddir = rel2abs($blddir);
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# Convenient cache of absolute to relative map. We start with filling it
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# with mappings for the known generated header files. They are relative to
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# the current working directory, so that's an easy task.
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# NOTE: there's more than C header files that are generated. They will also
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# generate entries in this map. We could of course deal with C header files
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# only, but in case we decide to handle more than just C files in the future,
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# we already have the mechanism in place here.
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# NOTE2: we lower case the index to make it searchable without regard for
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# character case. That could seem dangerous, but as long as we don't have
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# files we depend on in the same directory that only differ by character case,
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# we're fine.
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my %depconv_cache =
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map { catfile($abs_blddir, $_) => $_ }
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keys %{$unified_info{generate}};
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my %procedures = (
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'gcc' => undef, # gcc style dependency files needs no mods
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'makedepend' =>
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sub {
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# makedepend, in its infinite wisdom, wants to have the object file
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# in the same directory as the source file. This doesn't work too
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# well with out-of-source-tree builds, so we must resort to tricks
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# to get things right. Fortunately, the .d files are always placed
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# parallel with the object files, so all we need to do is construct
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# the object file name from the dep file name.
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(my $objfile = shift) =~ s|\.d$|.o|i;
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my $line = shift;
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# Discard comments
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return undef if $line =~ /^(#.*|\s*)$/;
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# Remove the original object file
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$line =~ s|^.*\.o: | |;
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# Also, remove any dependency that starts with a /, because those
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# are typically system headers
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$line =~ s/\s+\/(\\.|\S)*//g;
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# Finally, discard all empty lines
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return undef if $line =~ /^\s*$/;
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# All we got now is a dependency, just shave off surrounding spaces
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$line =~ s/^\s+//;
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$line =~ s/\s+$//;
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return ($objfile, $line);
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},
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'VMS C' =>
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sub {
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state $abs_srcdir_shaved = undef;
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state $srcdir_shaved = undef;
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unless (defined $abs_srcdir_shaved) {
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($abs_srcdir_shaved = $abs_srcdir) =~ s|[>\]]$||;
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($srcdir_shaved = $srcdir) =~ s|[>\]]$||;
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}
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# current versions of DEC / Compaq / HP / VSI C strips away all
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# directory information from the object file, so we must insert it
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# back. To make life simpler, we simply replace it with the
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# corresponding .D file that's had its extension changed. Since
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# .D files are always written parallel to the object files, we
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# thereby get the directory information for free.
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(my $objfile = shift) =~ s|\.D$|.OBJ|i;
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my $line = shift;
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# Shave off the target.
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#
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# The pattern for target and dependencies will always take this
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# form:
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#
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# target SPACE : SPACE deps
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#
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# This is so a volume delimiter (a : without any spaces around it)
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# won't get mixed up with the target / deps delimiter. We use this
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# to easily identify what needs to be removed.
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m|\s:\s|; $line = $';
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# We know that VMS has system header files in text libraries,
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# extension .TLB. We also know that our header files aren't stored
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# in text libraries. Finally, we know that VMS C produces exactly
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# one dependency per line, so we simply discard any line ending with
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# .TLB.
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return undef if /\.TLB\s*$/;
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# All we got now is a dependency, just shave off surrounding spaces
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$line =~ s/^\s+//;
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$line =~ s/\s+$//;
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# VMS C gives us absolute paths, always. Let's see if we can
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# make them relative instead.
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$line = canonpath($line);
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unless (defined $depconv_cache{$line}) {
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my $dep = $line;
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# Since we have already pre-populated the cache with
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# mappings for generated headers, we only need to deal
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# with the source tree.
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if ($dep =~ s|^\Q$abs_srcdir_shaved\E([\.>\]])?|$srcdir_shaved$1|i) {
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$depconv_cache{$line} = $dep;
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}
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}
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return ($objfile, $depconv_cache{$line})
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if defined $depconv_cache{$line};
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print STDERR "DEBUG[VMS C]: ignoring $objfile <- $line\n"
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if $debug;
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return undef;
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},
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'VC' =>
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sub {
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# For the moment, we only support Visual C on native Windows, or
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# compatible compilers. With those, the flags /Zs /showIncludes
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# give us the necessary output to be able to create dependencies
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# that nmake (or any 'make' implementation) should be able to read,
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# with a bit of help. The output we're interested in looks like
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# this (it always starts the same)
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#
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# Note: including file: {whatever header file}
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#
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# Since there's no object file name at all in that information,
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# we must construct it ourselves.
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(my $objfile = shift) =~ s|\.d$|.obj|i;
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my $line = shift;
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# There are also other lines mixed in, for example compiler
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# warnings, so we simply discard anything that doesn't start with
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# the Note:
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if (/^Note: including file: */) {
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(my $tail = $') =~ s/\s*\R$//;
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# VC gives us absolute paths for all include files, so to
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# remove system header dependencies, we need to check that
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# they don't match $abs_srcdir or $abs_blddir.
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$tail = canonpath($tail);
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unless (defined $depconv_cache{$tail}) {
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my $dep = $tail;
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# Since we have already pre-populated the cache with
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# mappings for generated headers, we only need to deal
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# with the source tree.
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if ($dep =~ s|^\Q$abs_srcdir\E\\|\$(SRCDIR)\\|i) {
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$depconv_cache{$tail} = $dep;
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}
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}
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return ($objfile, '"'.$depconv_cache{$tail}.'"')
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if defined $depconv_cache{$tail};
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print STDERR "DEBUG[VC]: ignoring $objfile <- $tail\n"
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if $debug;
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}
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return undef;
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},
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);
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my %continuations = (
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'gcc' => undef,
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'makedepend' => "\\",
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'VMS C' => "-",
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'VC' => "\\",
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);
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die "Producer unrecognised: $producer\n"
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unless exists $procedures{$producer} && exists $continuations{$producer};
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my $procedure = $procedures{$producer};
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my $continuation = $continuations{$producer};
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my $buildfile_new = "$buildfile-$$";
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my %collect = ();
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if (defined $procedure) {
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foreach my $depfile (@depfiles) {
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open IDEP,$depfile or die "Trying to read $depfile: $!\n";
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while (<IDEP>) {
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s|\R$||; # The better chomp
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my ($target, $deps) = $procedure->($depfile, $_);
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$collect{$target}->{$deps} = 1 if defined $target;
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}
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close IDEP;
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}
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}
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open IBF, $buildfile or die "Trying to read $buildfile: $!\n";
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open OBF, '>', $buildfile_new or die "Trying to write $buildfile_new: $!\n";
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while (<IBF>) {
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last if /^# DO NOT DELETE THIS LINE/;
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print OBF or die "$!\n";
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}
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close IBF;
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print OBF "# DO NOT DELETE THIS LINE -- make depend depends on it.\n";
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if (defined $procedure) {
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foreach my $target (sort keys %collect) {
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my $prefix = $target . ' :';
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my @deps = sort keys %{$collect{$target}};
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while (@deps) {
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my $buf = $prefix;
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$prefix = '';
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while (@deps && ($buf eq ''
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|| length($buf) + length($deps[0]) <= 77)) {
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$buf .= ' ' . shift @deps;
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}
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$buf .= ' '.$continuation if @deps;
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print OBF $buf,"\n" or die "Trying to print: $!\n"
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}
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}
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} else {
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foreach my $depfile (@depfiles) {
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open IDEP,$depfile or die "Trying to read $depfile: $!\n";
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while (<IDEP>) {
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print OBF or die "Trying to print: $!\n";
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}
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close IDEP;
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}
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}
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close OBF;
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if (compare_text($buildfile_new, $buildfile) != 0) {
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rename $buildfile_new, $buildfile
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or die "Trying to rename $buildfile_new -> $buildfile: $!\n";
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}
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END {
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# On VMS, we want to remove all generations of this file, in case there
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# are more than one, so we loop.
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if (defined $buildfile_new) {
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while (unlink $buildfile_new) {}
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}
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}
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