util/add-depends.pl - third_party/openssl - Git at Google

 #! /usr/bin/env perl
 # Copyright 2018-2022 The OpenSSL Project Authors. All Rights Reserved.
 #
 # Licensed under the Apache License 2.0 (the "License").  You may not use
 # this file except in compliance with the License.  You can obtain a copy
 # in the file LICENSE in the source distribution or at
 # https://www.openssl.org/source/license.html

 use strict;
 use warnings;

 use lib '.';
 use configdata;

 use File::Spec::Functions qw(:DEFAULT rel2abs);
 use File::Compare qw(compare_text);
 use feature 'state';

 # When using stat() on Windows, we can get it to perform better by avoid some
 # data.  This doesn't affect the mtime field, so we're not losing anything...
 ${^WIN32_SLOPPY_STAT} = 1;

 my $debug = $ENV{ADD_DEPENDS_DEBUG};
 my $buildfile = $config{build_file};
 my $build_mtime = (stat($buildfile))[9];
 my $configdata_mtime = (stat('configdata.pm'))[9];
 my $rebuild = 0;
 my $depext = $target{dep_extension} || ".d";
 my @depfiles =
     sort
     grep {
         # This grep has side effects.  Not only does if check the existence
         # of the dependency file given in $_, but it also checks if it's
         # newer than the build file or older than configdata.pm, and if it
         # is, sets $rebuild.
         my @st = stat($_);
         $rebuild = 1
             if @st && ($st[9] > $build_mtime || $st[9] < $configdata_mtime);
         scalar @st > 0;         # Determines the grep result
     }
     map { (my $x = $_) =~ s|\.o$|$depext|; $x; }
     ( ( grep { $unified_info{sources}->{$_}->[0] =~ /\.cc?$/ }
             keys %{$unified_info{sources}} ),
       ( grep { $unified_info{shared_sources}->{$_}->[0] =~ /\.cc?$/ }
             keys %{$unified_info{shared_sources}} ) );

 exit 0 unless $rebuild;

 # Ok, primary checks are done, time to do some real work

 my $producer = shift @ARGV;
 die "Producer not given\n" unless $producer;

 my $srcdir = $config{sourcedir};
 my $blddir = $config{builddir};
 my $abs_srcdir = rel2abs($srcdir);
 my $abs_blddir = rel2abs($blddir);

 # Convenient cache of absolute to relative map.  We start with filling it
 # with mappings for the known generated header files.  They are relative to
 # the current working directory, so that's an easy task.
 # NOTE: there's more than C header files that are generated.  They will also
 # generate entries in this map.  We could of course deal with C header files
 # only, but in case we decide to handle more than just C files in the future,
 # we already have the mechanism in place here.
 # NOTE2: we lower case the index to make it searchable without regard for
 # character case.  That could seem dangerous, but as long as we don't have
 # files we depend on in the same directory that only differ by character case,
 # we're fine.
 my %depconv_cache =
     map { catfile($abs_blddir, $_) => $_ }
     keys %{$unified_info{generate}};

 my %procedures = (
     'gcc' =>
         sub {
             (my $objfile = shift) =~ s|\.d$|.o|i;
             my $line = shift;

             # Remove the original object file
             $line =~ s|^.*\.o: | |;
             # All we got now is a dependency, shave off surrounding spaces
             $line =~ s/^\s+//;
             $line =~ s/\s+$//;
             # Also, shave off any continuation
             $line =~ s/\s*\\$//;

             # Split the line into individual header files, and keep those
             # that exist in some form
             my @headers;
             for (split(/\s+/, $line)) {
                 my $x = rel2abs($_);

                 if (!$depconv_cache{$x}) {
                     if (-f $x) {
                         $depconv_cache{$x} = $_;
                     }
                 }

                 if ($depconv_cache{$x}) {
                     push @headers, $_;
                 } else {
                     print STDERR "DEBUG[$producer]: ignoring $objfile <- $line\n"
                         if $debug;
                 }
             }
             return ($objfile, join(' ', @headers)) if @headers;
             return undef;
     },
     'makedepend' =>
         sub {
             # makedepend, in its infinite wisdom, wants to have the object file
             # in the same directory as the source file.  This doesn't work too
             # well with out-of-source-tree builds, so we must resort to tricks
             # to get things right.  Fortunately, the .d files are always placed
             # parallel with the object files, so all we need to do is construct
             # the object file name from the dep file name.
             (my $objfile = shift) =~ s|\.d$|.o|i;
             my $line = shift;

             # Discard comments
             return undef if $line =~ /^(#.*|\s*)$/;

             # Remove the original object file
             $line =~ s|^.*\.o: | |;
             # Also, remove any dependency that starts with a /, because those
             # are typically system headers
             $line =~ s/\s+\/(\\.|\S)*//g;
             # Finally, discard all empty lines
             return undef if $line =~ /^\s*$/;

             # All we got now is a dependency, just shave off surrounding spaces
             $line =~ s/^\s+//;
             $line =~ s/\s+$//;
             return ($objfile, $line);
         },
     'VMS C' =>
         sub {
             state $abs_srcdir_shaved = undef;
             state $srcdir_shaved = undef;

             unless (defined $abs_srcdir_shaved) {
                 ($abs_srcdir_shaved = $abs_srcdir) =~ s|[>\]]$||;
                 ($srcdir_shaved = $srcdir) =~ s|[>\]]$||;
             }

             # current versions of DEC / Compaq / HP / VSI C strips away all
             # directory information from the object file, so we must insert it
             # back.  To make life simpler, we simply replace it with the
             # corresponding .D file that's had its extension changed.  Since
             # .D files are always written parallel to the object files, we
             # thereby get the directory information for free.
             (my $objfile = shift) =~ s|\.D$|.OBJ|i;
             my $line = shift;

             # Shave off the target.
             #
             # The pattern for target and dependencies will always take this
             # form:
             #
             #   target SPACE : SPACE deps
             #
             # This is so a volume delimiter (a : without any spaces around it)
             # won't get mixed up with the target / deps delimiter.  We use this
             # to easily identify what needs to be removed.
             m|\s:\s|; $line = $';

             # We know that VMS has system header files in text libraries,
             # extension .TLB.  We also know that our header files aren't stored
             # in text libraries.  Finally, we know that VMS C produces exactly
             # one dependency per line, so we simply discard any line ending with
             # .TLB.
             return undef if /\.TLB\s*$/;

             # All we got now is a dependency, just shave off surrounding spaces
             $line =~ s/^\s+//;
             $line =~ s/\s+$//;

             # VMS C gives us absolute paths, always.  Let's see if we can
             # make them relative instead.
             $line = canonpath($line);

             unless (defined $depconv_cache{$line}) {
                 my $dep = $line;
                 # Since we have already pre-populated the cache with
                 # mappings for generated headers, we only need to deal
                 # with the source tree.
                 if ($dep =~ s|^\Q$abs_srcdir_shaved\E([\.>\]])?|$srcdir_shaved$1|i) {
                     # Also check that the header actually exists
                     if (-f $line) {
                         $depconv_cache{$line} = $dep;
                     }
                 }
             }
             return ($objfile, $depconv_cache{$line})
                 if defined $depconv_cache{$line};
             print STDERR "DEBUG[$producer]: ignoring $objfile <- $line\n"
                 if $debug;

             return undef;
         },
     'VC' =>
         sub {
             # With Microsoft Visual C the flags /Zs /showIncludes give us the
             # necessary output to be able to create dependencies that nmake
             # (or any 'make' implementation) should be able to read, with a
             # bit of help.  The output we're interested in looks something
             # like this (it always starts the same)
             #
             #   Note: including file: {whatever header file}
             #
             # This output is localized, so for example, the German pack gives
             # us this:
             #
             #   Hinweis: Einlesen der Datei:   {whatever header file}
             #
             # To accommodate, we need to use a very general regular expression
             # to parse those lines.
             #
             # Since there's no object file name at all in that information,
             # we must construct it ourselves.

             (my $objfile = shift) =~ s|\.d$|.obj|i;
             my $line = shift;

             # There are also other lines mixed in, for example compiler
             # warnings, so we simply discard anything that doesn't start with
             # the Note:

             if (/^[^:]*: [^:]*: */) {
                 (my $tail = $') =~ s/\s*\R$//;

                 # VC gives us absolute paths for all include files, so to
                 # remove system header dependencies, we need to check that
                 # they don't match $abs_srcdir or $abs_blddir.
                 $tail = canonpath($tail);

                 unless (defined $depconv_cache{$tail}) {
                     my $dep = $tail;
                     # Since we have already pre-populated the cache with
                     # mappings for generated headers, we only need to deal
                     # with the source tree.
                     if ($dep =~ s|^\Q$abs_srcdir\E\\|\$(SRCDIR)\\|i) {
                         # Also check that the header actually exists
                         if (-f $line) {
                             $depconv_cache{$tail} = $dep;
                         }
                     }
                 }
                 return ($objfile, '"'.$depconv_cache{$tail}.'"')
                     if defined $depconv_cache{$tail};
                 print STDERR "DEBUG[$producer]: ignoring $objfile <- $tail\n"
                     if $debug;
             }

             return undef;
         },
     'embarcadero' =>
         sub {
             # With Embarcadero C++Builder's preprocessor (cpp32.exe) the -Sx -Hp
             # flags give us the list of #include files read, like the following:
             #
             #   Including ->->{whatever header file}
             #
             # where each "->" indicates the nesting level of the #include.  The
             # logic here is otherwise the same as the 'VC' scheme.
             #
             # Since there's no object file name at all in that information,
             # we must construct it ourselves.

             (my $objfile = shift) =~ s|\.d$|.obj|i;
             my $line = shift;

             # There are also other lines mixed in, for example compiler
             # warnings, so we simply discard anything that doesn't start with
             # the Note:

             if (/^Including (->)*/) {
                 (my $tail = $') =~ s/\s*\R$//;

                 # C++Builder gives us relative paths when possible, so to
                 # remove system header dependencies, we convert them to
                 # absolute paths and check that they don't match $abs_srcdir
                 # or $abs_blddir, just as the 'VC' scheme.
                 $tail = rel2abs($tail);

                 unless (defined $depconv_cache{$tail}) {
                     my $dep = $tail;
                     # Since we have already pre-populated the cache with
                     # mappings for generated headers, we only need to deal
                     # with the source tree.
                     if ($dep =~ s|^\Q$abs_srcdir\E\\|\$(SRCDIR)\\|i) {
                         # Also check that the header actually exists
                         if (-f $line) {
                             $depconv_cache{$tail} = $dep;
                         }
                     }
                 }
                 return ($objfile, '"'.$depconv_cache{$tail}.'"')
                     if defined $depconv_cache{$tail};
                 print STDERR "DEBUG[$producer]: ignoring $objfile <- $tail\n"
                     if $debug;
             }

             return undef;
         },
 );
 my %continuations = (
     'gcc' => "\\",
     'makedepend' => "\\",
     'VMS C' => "-",
     'VC' => "\\",
     'embarcadero' => "\\",
 );

 die "Producer unrecognised: $producer\n"
     unless exists $procedures{$producer} && exists $continuations{$producer};

 my $procedure = $procedures{$producer};
 my $continuation = $continuations{$producer};

 my $buildfile_new = "$buildfile-$$";

 my %collect = ();
 foreach my $depfile (@depfiles) {
     open IDEP,$depfile or die "Trying to read $depfile: $!\n";
     while (<IDEP>) {
         s|\R$||;                # The better chomp
         my ($target, $deps) = $procedure->($depfile, $_);
         $collect{$target}->{$deps} = 1 if defined $target;
     }
     close IDEP;
 }

 open IBF, $buildfile or die "Trying to read $buildfile: $!\n";
 open OBF, '>', $buildfile_new or die "Trying to write $buildfile_new: $!\n";
 while (<IBF>) {
     last if /^# DO NOT DELETE THIS LINE/;
     print OBF or die "$!\n";
 }
 close IBF;

 print OBF "# DO NOT DELETE THIS LINE -- make depend depends on it.\n";

 foreach my $target (sort keys %collect) {
     my $prefix = $target . ' :';
     my @deps = sort keys %{$collect{$target}};

     while (@deps) {
         my $buf = $prefix;
         $prefix = '';

         while (@deps && ($buf eq ''
                          || length($buf) + length($deps[0]) <= 77)) {
             $buf .= ' ' . shift @deps;
         }
         $buf .= ' '.$continuation if @deps;

         print OBF $buf,"\n" or die "Trying to print: $!\n"
     }
 }

 close OBF;

 if (compare_text($buildfile_new, $buildfile) != 0) {
     rename $buildfile_new, $buildfile
         or die "Trying to rename $buildfile_new -> $buildfile: $!\n";
 }

 END {
     # On VMS, we want to remove all generations of this file, in case there
     # are more than one, so we loop.
     if (defined $buildfile_new) {
         while (unlink $buildfile_new) {}
     }
 }
	#! /usr/bin/env perl
	# Copyright 2018-2022 The OpenSSL Project Authors. All Rights Reserved.
	#
	# Licensed under the Apache License 2.0 (the "License"). You may not use
	# this file except in compliance with the License. You can obtain a copy
	# in the file LICENSE in the source distribution or at
	# https://www.openssl.org/source/license.html

	use strict;
	use warnings;

	use lib '.';
	use configdata;

	use File::Spec::Functions qw(:DEFAULT rel2abs);
	use File::Compare qw(compare_text);
	use feature 'state';

	# When using stat() on Windows, we can get it to perform better by avoid some
	# data. This doesn't affect the mtime field, so we're not losing anything...
	${^WIN32_SLOPPY_STAT} = 1;

	my $debug = $ENV{ADD_DEPENDS_DEBUG};
	my $buildfile = $config{build_file};
	my $build_mtime = (stat($buildfile))[9];
	my $configdata_mtime = (stat('configdata.pm'))[9];
	my $rebuild = 0;
	my $depext = $target{dep_extension} \|\| ".d";
	my @depfiles =
	sort
	grep {
	# This grep has side effects. Not only does if check the existence
	# of the dependency file given in $_, but it also checks if it's
	# newer than the build file or older than configdata.pm, and if it
	# is, sets $rebuild.
	my @st = stat($_);
	$rebuild = 1
	if @st && ($st[9] > $build_mtime \|\| $st[9] < $configdata_mtime);
	scalar @st > 0; # Determines the grep result
	}
	map { (my $x = $_) =~ s\|\.o$\|$depext\|; $x; }
	( ( grep { $unified_info{sources}->{$_}->[0] =~ /\.cc?$/ }
	keys %{$unified_info{sources}} ),
	( grep { $unified_info{shared_sources}->{$_}->[0] =~ /\.cc?$/ }
	keys %{$unified_info{shared_sources}} ) );

	exit 0 unless $rebuild;

	# Ok, primary checks are done, time to do some real work

	my $producer = shift @ARGV;
	die "Producer not given\n" unless $producer;

	my $srcdir = $config{sourcedir};
	my $blddir = $config{builddir};
	my $abs_srcdir = rel2abs($srcdir);
	my $abs_blddir = rel2abs($blddir);

	# Convenient cache of absolute to relative map. We start with filling it
	# with mappings for the known generated header files. They are relative to
	# the current working directory, so that's an easy task.
	# NOTE: there's more than C header files that are generated. They will also
	# generate entries in this map. We could of course deal with C header files
	# only, but in case we decide to handle more than just C files in the future,
	# we already have the mechanism in place here.
	# NOTE2: we lower case the index to make it searchable without regard for
	# character case. That could seem dangerous, but as long as we don't have
	# files we depend on in the same directory that only differ by character case,
	# we're fine.
	my %depconv_cache =
	map { catfile($abs_blddir, $_) => $_ }
	keys %{$unified_info{generate}};

	my %procedures = (
	'gcc' =>
	sub {
	(my $objfile = shift) =~ s\|\.d$\|.o\|i;
	my $line = shift;

	# Remove the original object file
	$line =~ s\|^.*\.o: \| \|;
	# All we got now is a dependency, shave off surrounding spaces
	$line =~ s/^\s+//;
	$line =~ s/\s+$//;
	# Also, shave off any continuation
	$line =~ s/\s*\\$//;

	# Split the line into individual header files, and keep those
	# that exist in some form
	my @headers;
	for (split(/\s+/, $line)) {
	my $x = rel2abs($_);

	if (!$depconv_cache{$x}) {
	if (-f $x) {
	$depconv_cache{$x} = $_;
	}
	}

	if ($depconv_cache{$x}) {
	push @headers, $_;
	} else {
	print STDERR "DEBUG[$producer]: ignoring $objfile <- $line\n"
	if $debug;
	}
	}
	return ($objfile, join(' ', @headers)) if @headers;
	return undef;
	},
	'makedepend' =>
	sub {
	# makedepend, in its infinite wisdom, wants to have the object file
	# in the same directory as the source file. This doesn't work too
	# well with out-of-source-tree builds, so we must resort to tricks
	# to get things right. Fortunately, the .d files are always placed
	# parallel with the object files, so all we need to do is construct
	# the object file name from the dep file name.
	(my $objfile = shift) =~ s\|\.d$\|.o\|i;
	my $line = shift;

	# Discard comments
	return undef if $line =~ /^(#.\|\s)$/;

	# Remove the original object file
	$line =~ s\|^.*\.o: \| \|;
	# Also, remove any dependency that starts with a /, because those
	# are typically system headers
	$line =~ s/\s+\/(\\.\|\S)*//g;
	# Finally, discard all empty lines
	return undef if $line =~ /^\s*$/;

	# All we got now is a dependency, just shave off surrounding spaces
	$line =~ s/^\s+//;
	$line =~ s/\s+$//;
	return ($objfile, $line);
	},
	'VMS C' =>
	sub {
	state $abs_srcdir_shaved = undef;
	state $srcdir_shaved = undef;

	unless (defined $abs_srcdir_shaved) {
	($abs_srcdir_shaved = $abs_srcdir) =~ s\|[>\]]$\|\|;
	($srcdir_shaved = $srcdir) =~ s\|[>\]]$\|\|;
	}

	# current versions of DEC / Compaq / HP / VSI C strips away all
	# directory information from the object file, so we must insert it
	# back. To make life simpler, we simply replace it with the
	# corresponding .D file that's had its extension changed. Since
	# .D files are always written parallel to the object files, we
	# thereby get the directory information for free.
	(my $objfile = shift) =~ s\|\.D$\|.OBJ\|i;
	my $line = shift;

	# Shave off the target.
	#
	# The pattern for target and dependencies will always take this
	# form:
	#
	# target SPACE : SPACE deps
	#
	# This is so a volume delimiter (a : without any spaces around it)
	# won't get mixed up with the target / deps delimiter. We use this
	# to easily identify what needs to be removed.
	m\|\s:\s\|; $line = $';

	# We know that VMS has system header files in text libraries,
	# extension .TLB. We also know that our header files aren't stored
	# in text libraries. Finally, we know that VMS C produces exactly
	# one dependency per line, so we simply discard any line ending with
	# .TLB.
	return undef if /\.TLB\s*$/;

	# All we got now is a dependency, just shave off surrounding spaces
	$line =~ s/^\s+//;
	$line =~ s/\s+$//;

	# VMS C gives us absolute paths, always. Let's see if we can
	# make them relative instead.
	$line = canonpath($line);

	unless (defined $depconv_cache{$line}) {
	my $dep = $line;
	# Since we have already pre-populated the cache with
	# mappings for generated headers, we only need to deal
	# with the source tree.
	if ($dep =~ s\|^\Q$abs_srcdir_shaved\E([\.>\]])?\|$srcdir_shaved$1\|i) {
	# Also check that the header actually exists
	if (-f $line) {
	$depconv_cache{$line} = $dep;
	}
	}
	}
	return ($objfile, $depconv_cache{$line})
	if defined $depconv_cache{$line};
	print STDERR "DEBUG[$producer]: ignoring $objfile <- $line\n"
	if $debug;

	return undef;
	},
	'VC' =>
	sub {
	# With Microsoft Visual C the flags /Zs /showIncludes give us the
	# necessary output to be able to create dependencies that nmake
	# (or any 'make' implementation) should be able to read, with a
	# bit of help. The output we're interested in looks something
	# like this (it always starts the same)
	#
	# Note: including file: {whatever header file}
	#
	# This output is localized, so for example, the German pack gives
	# us this:
	#
	# Hinweis: Einlesen der Datei: {whatever header file}
	#
	# To accommodate, we need to use a very general regular expression
	# to parse those lines.
	#
	# Since there's no object file name at all in that information,
	# we must construct it ourselves.

	(my $objfile = shift) =~ s\|\.d$\|.obj\|i;
	my $line = shift;

	# There are also other lines mixed in, for example compiler
	# warnings, so we simply discard anything that doesn't start with
	# the Note:

	if (/^[^:]: [^:]: */) {
	(my $tail = $') =~ s/\s*\R$//;

	# VC gives us absolute paths for all include files, so to
	# remove system header dependencies, we need to check that
	# they don't match $abs_srcdir or $abs_blddir.
	$tail = canonpath($tail);

	unless (defined $depconv_cache{$tail}) {
	my $dep = $tail;
	# Since we have already pre-populated the cache with
	# mappings for generated headers, we only need to deal
	# with the source tree.
	if ($dep =~ s\|^\Q$abs_srcdir\E\\\|\$(SRCDIR)\\\|i) {
	# Also check that the header actually exists
	if (-f $line) {
	$depconv_cache{$tail} = $dep;
	}
	}
	}
	return ($objfile, '"'.$depconv_cache{$tail}.'"')
	if defined $depconv_cache{$tail};
	print STDERR "DEBUG[$producer]: ignoring $objfile <- $tail\n"
	if $debug;
	}

	return undef;
	},
	'embarcadero' =>
	sub {
	# With Embarcadero C++Builder's preprocessor (cpp32.exe) the -Sx -Hp
	# flags give us the list of #include files read, like the following:
	#
	# Including ->->{whatever header file}
	#
	# where each "->" indicates the nesting level of the #include. The
	# logic here is otherwise the same as the 'VC' scheme.
	#
	# Since there's no object file name at all in that information,
	# we must construct it ourselves.

	(my $objfile = shift) =~ s\|\.d$\|.obj\|i;
	my $line = shift;

	# There are also other lines mixed in, for example compiler
	# warnings, so we simply discard anything that doesn't start with
	# the Note:

	if (/^Including (->)*/) {
	(my $tail = $') =~ s/\s*\R$//;

	# C++Builder gives us relative paths when possible, so to
	# remove system header dependencies, we convert them to
	# absolute paths and check that they don't match $abs_srcdir
	# or $abs_blddir, just as the 'VC' scheme.
	$tail = rel2abs($tail);

	unless (defined $depconv_cache{$tail}) {
	my $dep = $tail;
	# Since we have already pre-populated the cache with
	# mappings for generated headers, we only need to deal
	# with the source tree.
	if ($dep =~ s\|^\Q$abs_srcdir\E\\\|\$(SRCDIR)\\\|i) {
	# Also check that the header actually exists
	if (-f $line) {
	$depconv_cache{$tail} = $dep;
	}
	}
	}
	return ($objfile, '"'.$depconv_cache{$tail}.'"')
	if defined $depconv_cache{$tail};
	print STDERR "DEBUG[$producer]: ignoring $objfile <- $tail\n"
	if $debug;
	}

	return undef;
	},
	);
	my %continuations = (
	'gcc' => "\\",
	'makedepend' => "\\",
	'VMS C' => "-",
	'VC' => "\\",
	'embarcadero' => "\\",
	);

	die "Producer unrecognised: $producer\n"
	unless exists $procedures{$producer} && exists $continuations{$producer};

	my $procedure = $procedures{$producer};
	my $continuation = $continuations{$producer};

	my $buildfile_new = "$buildfile-$$";

	my %collect = ();
	foreach my $depfile (@depfiles) {
	open IDEP,$depfile or die "Trying to read $depfile: $!\n";
	while (<IDEP>) {
	s\|\R$\|\|; # The better chomp
	my ($target, $deps) = $procedure->($depfile, $_);
	$collect{$target}->{$deps} = 1 if defined $target;
	}
	close IDEP;
	}

	open IBF, $buildfile or die "Trying to read $buildfile: $!\n";
	open OBF, '>', $buildfile_new or die "Trying to write $buildfile_new: $!\n";
	while (<IBF>) {
	last if /^# DO NOT DELETE THIS LINE/;
	print OBF or die "$!\n";
	}
	close IBF;

	print OBF "# DO NOT DELETE THIS LINE -- make depend depends on it.\n";

	foreach my $target (sort keys %collect) {
	my $prefix = $target . ' :';
	my @deps = sort keys %{$collect{$target}};

	while (@deps) {
	my $buf = $prefix;
	$prefix = '';

	while (@deps && ($buf eq ''
	\|\| length($buf) + length($deps[0]) <= 77)) {
	$buf .= ' ' . shift @deps;
	}
	$buf .= ' '.$continuation if @deps;

	print OBF $buf,"\n" or die "Trying to print: $!\n"
	}
	}

	close OBF;

	if (compare_text($buildfile_new, $buildfile) != 0) {
	rename $buildfile_new, $buildfile
	or die "Trying to rename $buildfile_new -> $buildfile: $!\n";
	}

	END {
	# On VMS, we want to remove all generations of this file, in case there
	# are more than one, so we loop.
	if (defined $buildfile_new) {
	while (unlink $buildfile_new) {}
	}
	}