confdata.pm.in: New template for configdata.pm

To have the configdata.pm text embedded in Configure was kind of ugly,
and becomes clearer if put into a template file, configdata.pm.in.  We
can then use OpenSSL::Template to generate it.

We also modify configdata.pm to be the build file generator, and run
it from Configure.  The benefit with that is that developers who
tinker and play with the build file can do a "factory reset" without
having to go through the configuration process, i.e. they can re-use
the config data the already have.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9693)

Configure

@@ -19,6 +19,7 @@ use File::Spec::Functions qw/:DEFAULT abs2rel rel2abs splitdir/;
 use File::Path qw/mkpath/;
 use OpenSSL::fallback "$FindBin::Bin/external/perl/MODULES.txt";
 use OpenSSL::Glob;
+use OpenSSL::Template;
 
 # see INSTALL for instructions.
 
@@ -2387,452 +2388,50 @@ foreach (grep /_(asm|aux)_src$/, keys %target) {
 
 # Write down our configuration where it fits #########################
 
-print "Creating configdata.pm\n";
-open(OUT,">configdata.pm") || die "unable to create configdata.pm: $!\n";
-print OUT <<"EOF";
-#! $config{HASHBANGPERL}
-
-package configdata;
-
-use strict;
-use warnings;
-
-use Exporter;
-#use vars qw(\@ISA \@EXPORT);
-our \@ISA = qw(Exporter);
-our \@EXPORT = qw(\%config \%target \%disabled \%withargs \%unified_info \@disablables \@disablables_int);
-
-EOF
-print OUT "our %config = (\n";
-foreach (sort keys %config) {
-    if (ref($config{$_}) eq "ARRAY") {
-        print OUT "  ", $_, " => [ ", join(", ",
-                                           map { quotify("perl", $_) }
-                                           @{$config{$_}}), " ],\n";
-    } elsif (ref($config{$_}) eq "HASH") {
-        print OUT "  ", $_, " => {";
-        if (scalar keys %{$config{$_}} > 0) {
-            print OUT "\n";
-            foreach my $key (sort keys %{$config{$_}}) {
-                print OUT "      ",
-                    join(" => ",
-                         quotify("perl", $key),
-                         defined $config{$_}->{$key}
-                             ? quotify("perl", $config{$_}->{$key})
-                             : "undef");
-                print OUT ",\n";
-            }
-            print OUT "  ";
-        }
-        print OUT "},\n";
-    } else {
-        print OUT "  ", $_, " => ", quotify("perl", $config{$_}), ",\n"
-    }
-}
-print OUT <<"EOF";
-);
-
-EOF
-print OUT "our %target = (\n";
-foreach (sort keys %target) {
-    if (ref($target{$_}) eq "ARRAY") {
-        print OUT "  ", $_, " => [ ", join(", ",
-                                           map { quotify("perl", $_) }
-                                           @{$target{$_}}), " ],\n";
-    } else {
-        print OUT "  ", $_, " => ", quotify("perl", $target{$_}), ",\n"
-    }
-}
-print OUT <<"EOF";
+my %template_vars = (
+    config => \%config,
+    target => \%target,
+    disablables => \@disablables,
+    disablables_int => \@disablables_int,
+    disabled => \%disabled,
+    withargs => \%withargs,
+    unified_info => \%unified_info,
+    tls => \@tls,
+    dtls => \@dtls,
+    makevars => [ sort keys %user ],
+    disabled_info => \%disabled_info,
+    user_crossable => \@user_crossable,
 );
-
-EOF
-print OUT "our \%available_protocols = (\n";
-print OUT "  tls => [ ", join(", ", map { quotify("perl", $_) } @tls), " ],\n";
-print OUT "  dtls => [ ", join(", ", map { quotify("perl", $_) } @dtls), " ],\n";
-print OUT <<"EOF";
-);
-
-EOF
-print OUT "our \@disablables = (\n";
-foreach (@disablables) {
-    print OUT "  ", quotify("perl", $_), ",\n";
-}
-print OUT <<"EOF";
-);
-
-EOF
-print OUT "# The following come from Configure's @disablables_int\n";
-print OUT "our \@disablables_int = (\n";
-foreach (@disablables_int) {
-    print OUT "  ", quotify("perl", $_), ",\n";
-}
-print OUT <<"EOF";
-);
-
-EOF
-print OUT "our \%disabled = (\n";
-foreach (sort keys %disabled) {
-    print OUT "  ", quotify("perl", $_), " => ", quotify("perl", $disabled{$_}), ",\n";
-}
-print OUT <<"EOF";
-);
-
-EOF
-print OUT "our %withargs = (\n";
-foreach (sort keys %withargs) {
-    if (ref($withargs{$_}) eq "ARRAY") {
-        print OUT "  ", $_, " => [ ", join(", ",
-                                           map { quotify("perl", $_) }
-                                           @{$withargs{$_}}), " ],\n";
-    } else {
-        print OUT "  ", $_, " => ", quotify("perl", $withargs{$_}), ",\n"
-    }
-}
-print OUT <<"EOF";
-);
-
-EOF
-if ($builder eq "unified") {
-    my $recurse;
-    $recurse = sub {
-        my $indent = shift;
-        foreach (@_) {
-            if (ref $_ eq "ARRAY") {
-                print OUT " "x$indent, "[\n";
-                foreach (@$_) {
-                    $recurse->($indent + 4, $_);
-                }
-                print OUT " "x$indent, "],\n";
-            } elsif (ref $_ eq "HASH") {
-                my %h = %$_;
-                print OUT " "x$indent, "{\n";
-                foreach (sort keys %h) {
-                    if (ref $h{$_} eq "") {
-                        print OUT " "x($indent + 4), quotify("perl", $_), " => ", quotify("perl", $h{$_}), ",\n";
-                    } else {
-                        print OUT " "x($indent + 4), quotify("perl", $_), " =>\n";
-                        $recurse->($indent + 8, $h{$_});
-                    }
-                }
-                print OUT " "x$indent, "},\n";
-            } else {
-                print OUT " "x$indent, quotify("perl", $_), ",\n";
-            }
-        }
-    };
-    print OUT "our %unified_info = (\n";
-    foreach (sort keys %unified_info) {
-        if (ref $unified_info{$_} eq "") {
-            print OUT " "x4, quotify("perl", $_), " => ", quotify("perl", $unified_info{$_}), ",\n";
-        } else {
-            print OUT " "x4, quotify("perl", $_), " =>\n";
-            $recurse->(8, $unified_info{$_});
-        }
-    }
-    print OUT <<"EOF";
-);
-
-EOF
-}
-print OUT
-    "# The following data is only used when this files is use as a script\n";
-print OUT "my \@makevars = (\n";
-foreach (sort keys %user) {
-    print OUT "    '",$_,"',\n";
-}
-print OUT ");\n";
-print OUT "my \%disabled_info = (\n";
-foreach my $what (sort keys %disabled_info) {
-    print OUT "    '$what' => {\n";
-    foreach my $info (sort keys %{$disabled_info{$what}}) {
-        if (ref $disabled_info{$what}->{$info} eq 'ARRAY') {
-            print OUT "        $info => [ ",
-                join(', ', map { "'$_'" } @{$disabled_info{$what}->{$info}}),
-                " ],\n";
-        } else {
-            print OUT "        $info => '", $disabled_info{$what}->{$info},
-                "',\n";
-        }
-    }
-    print OUT "    },\n";
-}
-print OUT ");\n";
-print OUT 'my @user_crossable = qw( ', join (' ', @user_crossable), " );\n";
-print OUT << 'EOF';
-# If run directly, we can give some answers, and even reconfigure
-unless (caller) {
-    use Getopt::Long;
-    use File::Spec::Functions;
-    use File::Basename;
-    use Pod::Usage;
-
-    my $here = dirname($0);
-
-    my $dump = undef;
-    my $cmdline = undef;
-    my $options = undef;
-    my $target = undef;
-    my $envvars = undef;
-    my $makevars = undef;
-    my $buildparams = undef;
-    my $reconf = undef;
-    my $verbose = undef;
-    my $help = undef;
-    my $man = undef;
-    GetOptions('dump|d'                 => \$dump,
-               'command-line|c'         => \$cmdline,
-               'options|o'              => \$options,
-               'target|t'               => \$target,
-               'environment|e'          => \$envvars,
-               'make-variables|m'       => \$makevars,
-               'build-parameters|b'     => \$buildparams,
-               'reconfigure|reconf|r'   => \$reconf,
-               'verbose|v'              => \$verbose,
-               'help'                   => \$help,
-               'man'                    => \$man)
-        or die "Errors in command line arguments\n";
-
-    unless ($dump || $cmdline || $options || $target || $envvars || $makevars
-            || $buildparams || $reconf || $verbose || $help || $man) {
-        print STDERR <<"_____";
-You must give at least one option.
-For more information, do '$0 --help'
-_____
-        exit(2);
-    }
-
-    if ($help) {
-        pod2usage(-exitval => 0,
-                  -verbose => 1);
-    }
-    if ($man) {
-        pod2usage(-exitval => 0,
-                  -verbose => 2);
-    }
-    if ($dump || $cmdline) {
-        print "\nCommand line (with current working directory = $here):\n\n";
-        print '    ',join(' ',
-                          $config{PERL},
-                          catfile($config{sourcedir}, 'Configure'),
-                          @{$config{perlargv}}), "\n";
-        print "\nPerl information:\n\n";
-        print '    ',$config{perl_cmd},"\n";
-        print '    ',$config{perl_version},' for ',$config{perl_archname},"\n";
-    }
-    if ($dump || $options) {
-        my $longest = 0;
-        my $longest2 = 0;
-        foreach my $what (@disablables) {
-            $longest = length($what) if $longest < length($what);
-            $longest2 = length($disabled{$what})
-                if $disabled{$what} && $longest2 < length($disabled{$what});
-        }
-        print "\nEnabled features:\n\n";
-        foreach my $what (@disablables) {
-            print "    $what\n" unless $disabled{$what};
-        }
-        print "\nDisabled features:\n\n";
-        foreach my $what (@disablables) {
-            if ($disabled{$what}) {
-                print "    $what", ' ' x ($longest - length($what) + 1),
-                    "[$disabled{$what}]", ' ' x ($longest2 - length($disabled{$what}) + 1);
-                print $disabled_info{$what}->{macro}
-                    if $disabled_info{$what}->{macro};
-                print ' (skip ',
-                    join(', ', @{$disabled_info{$what}->{skipped}}),
-                    ')'
-                    if $disabled_info{$what}->{skipped};
-                print "\n";
-            }
-        }
-    }
-    if ($dump || $target) {
-        print "\nConfig target attributes:\n\n";
-        foreach (sort keys %target) {
-            next if $_ =~ m|^_| || $_ eq 'template';
-            my $quotify = sub {
-                map { (my $x = $_) =~ s|([\\\$\@"])|\\$1|g; "\"$x\""} @_;
-            };
-            print '    ', $_, ' => ';
-            if (ref($target{$_}) eq "ARRAY") {
-                print '[ ', join(', ', $quotify->(@{$target{$_}})), " ],\n";
-            } else {
-                print $quotify->($target{$_}), ",\n"
-            }
-        }
-    }
-    if ($dump || $envvars) {
-        print "\nRecorded environment:\n\n";
-        foreach (sort keys %{$config{perlenv}}) {
-            print '    ',$_,' = ',($config{perlenv}->{$_} || ''),"\n";
-        }
-    }
-    if ($dump || $makevars) {
-        print "\nMakevars:\n\n";
-        foreach my $var (@makevars) {
-            my $prefix = '';
-            $prefix = $config{CROSS_COMPILE}
-                if grep { $var eq $_ } @user_crossable;
-            $prefix //= '';
-            print '    ',$var,' ' x (16 - length $var),'= ',
-                (ref $config{$var} eq 'ARRAY'
-                 ? join(' ', @{$config{$var}})
-                 : $prefix.$config{$var}),
-                "\n"
-                if defined $config{$var};
-        }
-
-        my @buildfile = ($config{builddir}, $config{build_file});
-        unshift @buildfile, $here
-            unless file_name_is_absolute($config{builddir});
-        my $buildfile = canonpath(catdir(@buildfile));
-        print <<"_____";
-
-NOTE: These variables only represent the configuration view.  The build file
-template may have processed these variables further, please have a look at the
-build file for more exact data:
-    $buildfile
-_____
-    }
-    if ($dump || $buildparams) {
-        my @buildfile = ($config{builddir}, $config{build_file});
-        unshift @buildfile, $here
-            unless file_name_is_absolute($config{builddir});
-        print "\nbuild file:\n\n";
-        print "    ", canonpath(catfile(@buildfile)),"\n";
-
-        print "\nbuild file templates:\n\n";
-        foreach (@{$config{build_file_templates}}) {
-            my @tmpl = ($_);
-            unshift @tmpl, $here
-                unless file_name_is_absolute($config{sourcedir});
-            print '    ',canonpath(catfile(@tmpl)),"\n";
-        }
-    }
-    if ($reconf) {
-        if ($verbose) {
-            print 'Reconfiguring with: ', join(' ',@{$config{perlargv}}), "\n";
-            foreach (sort keys %{$config{perlenv}}) {
-                print '    ',$_,' = ',($config{perlenv}->{$_} || ""),"\n";
-            }
-        }
-
-        chdir $here;
-        exec $^X,catfile($config{sourcedir}, 'Configure'),'reconf';
-    }
-}
-
-1;
-
-__END__
-
-=head1 NAME
-
-configdata.pm - configuration data for OpenSSL builds
-
-=head1 SYNOPSIS
-
-Interactive:
-
-  perl configdata.pm [options]
-
-As data bank module:
-
-  use configdata;
-
-=head1 DESCRIPTION
-
-This module can be used in two modes, interactively and as a module containing
-all the data recorded by OpenSSL's Configure script.
-
-When used interactively, simply run it as any perl script, with at least one
-option, and you will get the information you ask for.  See L</OPTIONS> below.
-
-When loaded as a module, you get a few databanks with useful information to
-perform build related tasks.  The databanks are:
-
-    %config             Configured things.
-    %target             The OpenSSL config target with all inheritances
-                        resolved.
-    %disabled           The features that are disabled.
-    @disablables        The list of features that can be disabled.
-    %withargs           All data given through --with-THING options.
-    %unified_info       All information that was computed from the build.info
-                        files.
-
-=head1 OPTIONS
-
-=over 4
-
-=item B<--help>
-
-Print a brief help message and exit.
-
-=item B<--man>
-
-Print the manual page and exit.
-
-=item B<--dump> | B<-d>
-
-Print all relevant configuration data.  This is equivalent to B<--command-line>
-B<--options> B<--target> B<--environment> B<--make-variables>
-B<--build-parameters>.
-
-=item B<--command-line> | B<-c>
-
-Print the current configuration command line.
-
-=item B<--options> | B<-o>
-
-Print the features, both enabled and disabled, and display defined macro and
-skipped directories where applicable.
-
-=item B<--target> | B<-t>
-
-Print the config attributes for this config target.
-
-=item B<--environment> | B<-e>
-
-Print the environment variables and their values at the time of configuration.
-
-=item B<--make-variables> | B<-m>
-
-Print the main make variables generated in the current configuration
-
-=item B<--build-parameters> | B<-b>
-
-Print the build parameters, i.e. build file and build file templates.
-
-=item B<--reconfigure> | B<--reconf> | B<-r>
-
-Redo the configuration.
-
-=item B<--verbose> | B<-v>
-
-Verbose output.
-
-=back
-
-=cut
-
-EOF
-close(OUT);
+my $configdata_outname = 'configdata.pm';
+print "Creating $configdata_outname\n";
+open CONFIGDATA, ">$configdata_outname.new"
+            or die "Trying to create $configdata_outname.new: $!";
+my $configdata_tmplname = cleanfile($srcdir, "configdata.pm.in", $blddir);
+my $configdata_tmpl =
+    OpenSSL::Template->new(TYPE => 'FILE', SOURCE => $configdata_tmplname);
+$configdata_tmpl->fill_in(
+    FILENAME => $configdata_tmplname,
+    OUTPUT => \*CONFIGDATA,
+    HASH => { %template_vars,
+              autowarntext => [
+                  'WARNING: do not edit!',
+                  "Generated by Configure from $configdata_tmplname",
+              ] }
+) or die $Text::Template::ERROR;
+close CONFIGDATA;
+rename "$configdata_outname.new", $configdata_outname;
 if ($builder_platform eq 'unix') {
     my $mode = (0755 & ~umask);
     chmod $mode, 'configdata.pm'
         or warn sprintf("WARNING: Couldn't change mode for 'configdata.pm' to 0%03o: %s\n",$mode,$!);
 }
 
-my %builders = (
-    unified => sub {
-        print 'Creating ',$target{build_file},"\n";
-        run_dofile(catfile($blddir, $target{build_file}),
-                   @{$config{build_file_templates}});
-    },
-    );
-
-$builders{$builder}->($builder_platform, @builder_opts);
+print "Running $configdata_outname\n";
+my $perlcmd = (quotify("maybeshell", $config{PERL}))[0];
+my $cmd = "$perlcmd $configdata_outname";
+#print STDERR "DEBUG[run_dofile]: \$cmd = $cmd\n";
+system($cmd);
+exit 1 if $? != 0;
 
 $SIG{__DIE__} = $orig_death_handler;
 
@@ -3223,24 +2822,6 @@ sub usage
         exit(1);
         }
 
-sub run_dofile
-{
-    my $out = shift;
-    my @templates = @_;
-
-    unlink $out || warn "Can't remove $out, $!"
-        if -f $out;
-    foreach (@templates) {
-        die "Can't open $_, $!" unless -f $_;
-    }
-    my $perlcmd = (quotify("maybeshell", $config{PERL}))[0];
-    my $cmd = "$perlcmd \"-I.\" \"-Mconfigdata\" \"$dofile\" -o\"Configure\" \"".join("\" \"",@templates)."\" > \"$out.new\"";
-    #print STDERR "DEBUG[run_dofile]: \$cmd = $cmd\n";
-    system($cmd);
-    exit 1 if $? != 0;
-    rename("$out.new", $out) || die "Can't rename $out.new, $!";
-}
-
 sub compiler_predefined {
     state %predefined;
     my $cc = shift;

configdata.pm.in

@@ -0,0 +1,418 @@
+#! {- $config{HASHBANGPERL} -}
+# -*- mode: perl -*-
+{-
+ sub out_item {
+     my $ref = shift;
+     # Available options:
+     # indent           => callers indentation (int)
+     # delimiters       => 1 if outer delimiters should be added
+     my %opts = @_;
+
+     my $indent = $opts{indent} // 0;
+     # Indentation of the whole structure, where applicable
+     my $nlindent1 = "\n" . ' ' x $indent;
+     # Indentation of individual items, where applicable
+     my $nlindent2 = "\n" . ' ' x ($indent + 4);
+
+     my $product;      # Finished product, or reference to a function that
+                       # produces a string, given $_
+     # The following are only used when $product is a function reference
+     my $delim_l;      # Left delimiter of structure
+     my $delim_r;      # Right delimiter of structure
+     my $separator;    # Item separator
+     my @items;        # Items to iterate over
+
+     if (ref($ref) eq "ARRAY") {
+         if (scalar @$ref == 0) {
+             $product = $opts{delimiters} ? '[]' : '';
+         } else {
+             $product = sub {
+                 out_item(\$_, delimiters => 1, indent => $indent + 4)
+             };
+             $delim_l = ($opts{delimiters} ? '[' : '').$nlindent2;
+             $delim_r = $nlindent1.($opts{delimiters} ? ']' : '');
+             $separator = ",$nlindent2";
+             @items = @$ref;
+         }
+     } elsif (ref($ref) eq "HASH") {
+         if (scalar keys %$ref == 0) {
+             $product = $opts{delimiters} ? '{}' : '';
+         } else {
+             $product = sub {
+                 quotify1($_) . " => "
+                 . out_item($ref->{$_}, delimiters => 1, indent => $indent + 4)
+             };
+             $delim_l = ($opts{delimiters} ? '{' : '').$nlindent2;
+             $delim_r = $nlindent1.($opts{delimiters} ? '}' : '');
+             $separator = ",$nlindent2";
+             @items = sort keys %$ref;
+         }
+     } elsif (ref($ref) eq "SCALAR") {
+         $product = defined $$ref ? quotify1 $$ref : "undef";
+     } else {
+         $product = defined $ref ? quotify1 $ref : "undef";
+     }
+
+     if (ref($product) eq "CODE") {
+         $delim_l . join($separator, map { &$product } @items) . $delim_r;
+     } else {
+         $product;
+     }
+ }
+
+ # We must make sourcedir() return an absolute path, because configdata.pm
+ # may be loaded as a module from any script in any directory, making
+ # relative paths untrustable.  Because the result is used with 'use lib',
+ # we must ensure that it returns a Unix style path.  Cwd::abs_path does
+ # that (File::Spec::Functions::rel2abs return O/S specific paths)
+ use File::Spec::Functions;
+ use Cwd qw(abs_path);
+ sub sourcedir {
+     return abs_path(catdir($config{sourcedir}, @_));
+ }
+ sub sourcefile {
+     return abs_path(catfile($config{sourcedir}, @_));
+ }
+-}
+package configdata;
+
+use strict;
+use warnings;
+
+use Exporter;
+our @ISA = qw(Exporter);
+our @EXPORT = qw(
+    %config %target %disabled %withargs %unified_info
+    @disablables @disablables_int
+);
+
+our %config = ({- out_item(\%config); -});
+our %target = ({- out_item(\%target); -});
+our @disablables = ({- out_item(\@disablables) -});
+our @disablables_int = ({- out_item(\@disablables_int) -});
+our %disabled = ({- out_item(\%disabled); -});
+our %withargs = ({- out_item(\%withargs); -});
+our %unified_info = ({- out_item(\%unified_info); -});
+
+# Unexported, only used by OpenSSL::Test::Utils::available_protocols()
+our %available_protocols = (
+    tls  => [{- out_item(\@tls) -}],
+    dtls => [{- out_item(\@dtls) -}],
+);
+
+# The following data is only used when this files is use as a script
+my @makevars = ({- out_item(\@makevars); -});
+my %disabled_info = ({- out_item(\%disabled_info); -});
+my @user_crossable = qw( {- join (' ', @user_crossable) -} );
+
+# If run directly, we can give some answers, and even reconfigure
+unless (caller) {
+    use Getopt::Long;
+    use File::Spec::Functions;
+    use File::Basename;
+    use Pod::Usage;
+
+    my $here = dirname($0);
+
+    if (scalar @ARGV == 0) {
+        # With no arguments, re-create the build file
+
+        use lib '{- sourcedir('util', 'perl') -}';
+        use OpenSSL::fallback '{- sourcefile('external', 'perl', 'MODULES.txt') -}';
+        use OpenSSL::Template;
+
+        my $prepend = <<"_____";
+use File::Spec::Functions;
+use lib '{- sourcedir('util', 'perl') -}';
+_____
+        $prepend .= <<"_____" if defined $target{perl_platform};
+use lib '{- sourcedir('Configurations') -}';
+use lib '{- $config{builddir} -}';
+use platform;
+_____
+
+        my @autowarntext = (
+            'WARNING: do not edit!',
+            "Generated by configdata.pm from "
+            .join(", ", @{$config{build_file_templates}})
+        );
+
+        print 'Creating ',$target{build_file},"\n";
+        open BUILDFILE, ">$target{build_file}.new"
+            or die "Trying to create $target{build_file}.new: $!";
+        foreach (@{$config{build_file_templates}}) {
+            my $tmpl = OpenSSL::Template->new(TYPE => 'FILE',
+                                              SOURCE => $_);
+            $tmpl->fill_in(FILENAME => $_,
+                           OUTPUT => \*BUILDFILE,
+                           HASH => { config => \%config,
+                                     target => \%target,
+                                     disabled => \%disabled,
+                                     withargs => \%withargs,
+                                     unified_info => \%unified_info,
+                                     autowarntext => \@autowarntext },
+                           PREPEND => $prepend,
+                           # To ensure that global variables and functions
+                           # defined in one template stick around for the
+                           # next, making them combinable
+                           PACKAGE => 'OpenSSL::safe')
+                or die $Text::Template::ERROR;
+        }
+        close BUILDFILE;
+        rename("$target{build_file}.new", $target{build_file})
+            or die "Trying to rename $target{build_file}.new to $target{build_file}: $!";
+
+        exit(0);
+    }
+
+    my $dump = undef;
+    my $cmdline = undef;
+    my $options = undef;
+    my $target = undef;
+    my $envvars = undef;
+    my $makevars = undef;
+    my $buildparams = undef;
+    my $reconf = undef;
+    my $verbose = undef;
+    my $help = undef;
+    my $man = undef;
+    GetOptions('dump|d'                 => \$dump,
+               'command-line|c'         => \$cmdline,
+               'options|o'              => \$options,
+               'target|t'               => \$target,
+               'environment|e'          => \$envvars,
+               'make-variables|m'       => \$makevars,
+               'build-parameters|b'     => \$buildparams,
+               'reconfigure|reconf|r'   => \$reconf,
+               'verbose|v'              => \$verbose,
+               'help'                   => \$help,
+               'man'                    => \$man)
+        or die "Errors in command line arguments\n";
+
+    if (scalar @ARGV > 0) {
+        print STDERR <<"_____";
+Unrecognised arguments.
+For more information, do '$0 --help'
+_____
+        exit(2);
+    }
+
+    if ($help) {
+        pod2usage(-exitval => 0,
+                  -verbose => 1);
+    }
+    if ($man) {
+        pod2usage(-exitval => 0,
+                  -verbose => 2);
+    }
+    if ($dump || $cmdline) {
+        print "\nCommand line (with current working directory = $here):\n\n";
+        print '    ',join(' ',
+                          $config{PERL},
+                          catfile($config{sourcedir}, 'Configure'),
+                          @{$config{perlargv}}), "\n";
+        print "\nPerl information:\n\n";
+        print '    ',$config{perl_cmd},"\n";
+        print '    ',$config{perl_version},' for ',$config{perl_archname},"\n";
+    }
+    if ($dump || $options) {
+        my $longest = 0;
+        my $longest2 = 0;
+        foreach my $what (@disablables) {
+            $longest = length($what) if $longest < length($what);
+            $longest2 = length($disabled{$what})
+                if $disabled{$what} && $longest2 < length($disabled{$what});
+        }
+        print "\nEnabled features:\n\n";
+        foreach my $what (@disablables) {
+            print "    $what\n" unless $disabled{$what};
+        }
+        print "\nDisabled features:\n\n";
+        foreach my $what (@disablables) {
+            if ($disabled{$what}) {
+                print "    $what", ' ' x ($longest - length($what) + 1),
+                    "[$disabled{$what}]", ' ' x ($longest2 - length($disabled{$what}) + 1);
+                print $disabled_info{$what}->{macro}
+                    if $disabled_info{$what}->{macro};
+                print ' (skip ',
+                    join(', ', @{$disabled_info{$what}->{skipped}}),
+                    ')'
+                    if $disabled_info{$what}->{skipped};
+                print "\n";
+            }
+        }
+    }
+    if ($dump || $target) {
+        print "\nConfig target attributes:\n\n";
+        foreach (sort keys %target) {
+            next if $_ =~ m|^_| || $_ eq 'template';
+            my $quotify = sub {
+                map { (my $x = $_) =~ s|([\\\$\@"])|\\$1|g; "\"$x\""} @_;
+            };
+            print '    ', $_, ' => ';
+            if (ref($target{$_}) eq "ARRAY") {
+                print '[ ', join(', ', $quotify->(@{$target{$_}})), " ],\n";
+            } else {
+                print $quotify->($target{$_}), ",\n"
+            }
+        }
+    }
+    if ($dump || $envvars) {
+        print "\nRecorded environment:\n\n";
+        foreach (sort keys %{$config{perlenv}}) {
+            print '    ',$_,' = ',($config{perlenv}->{$_} || ''),"\n";
+        }
+    }
+    if ($dump || $makevars) {
+        print "\nMakevars:\n\n";
+        foreach my $var (@makevars) {
+            my $prefix = '';
+            $prefix = $config{CROSS_COMPILE}
+                if grep { $var eq $_ } @user_crossable;
+            $prefix //= '';
+            print '    ',$var,' ' x (16 - length $var),'= ',
+                (ref $config{$var} eq 'ARRAY'
+                 ? join(' ', @{$config{$var}})
+                 : $prefix.$config{$var}),
+                "\n"
+                if defined $config{$var};
+        }
+
+        my @buildfile = ($config{builddir}, $config{build_file});
+        unshift @buildfile, $here
+            unless file_name_is_absolute($config{builddir});
+        my $buildfile = canonpath(catdir(@buildfile));
+        print <<"_____";
+
+NOTE: These variables only represent the configuration view.  The build file
+template may have processed these variables further, please have a look at the
+build file for more exact data:
+    $buildfile
+_____
+    }
+    if ($dump || $buildparams) {
+        my @buildfile = ($config{builddir}, $config{build_file});
+        unshift @buildfile, $here
+            unless file_name_is_absolute($config{builddir});
+        print "\nbuild file:\n\n";
+        print "    ", canonpath(catfile(@buildfile)),"\n";
+
+        print "\nbuild file templates:\n\n";
+        foreach (@{$config{build_file_templates}}) {
+            my @tmpl = ($_);
+            unshift @tmpl, $here
+                unless file_name_is_absolute($config{sourcedir});
+            print '    ',canonpath(catfile(@tmpl)),"\n";
+        }
+    }
+    if ($reconf) {
+        if ($verbose) {
+            print 'Reconfiguring with: ', join(' ',@{$config{perlargv}}), "\n";
+            foreach (sort keys %{$config{perlenv}}) {
+                print '    ',$_,' = ',($config{perlenv}->{$_} || ""),"\n";
+            }
+        }
+
+        chdir $here;
+        exec $^X,catfile($config{sourcedir}, 'Configure'),'reconf';
+    }
+}
+
+1;
+
+__END__
+
+=head1 NAME
+
+configdata.pm - configuration data for OpenSSL builds
+
+=head1 SYNOPSIS
+
+Interactive:
+
+  perl configdata.pm [options]
+
+As data bank module:
+
+  use configdata;
+
+=head1 DESCRIPTION
+
+This module can be used in two modes, interactively and as a module containing
+all the data recorded by OpenSSL's Configure script.
+
+When used interactively, simply run it as any perl script.
+If run with no arguments, it will rebuild the build file (Makefile or
+corresponding).
+With at least one option, it will instead get the information you ask for, or
+re-run the configuration process.
+See L</OPTIONS> below for more information.
+
+When loaded as a module, you get a few databanks with useful information to
+perform build related tasks.  The databanks are:
+
+    %config             Configured things.
+    %target             The OpenSSL config target with all inheritances
+                        resolved.
+    %disabled           The features that are disabled.
+    @disablables        The list of features that can be disabled.
+    %withargs           All data given through --with-THING options.
+    %unified_info       All information that was computed from the build.info
+                        files.
+
+=head1 OPTIONS
+
+=over 4
+
+=item B<--help>
+
+Print a brief help message and exit.
+
+=item B<--man>
+
+Print the manual page and exit.
+
+=item B<--dump> | B<-d>
+
+Print all relevant configuration data.  This is equivalent to B<--command-line>
+B<--options> B<--target> B<--environment> B<--make-variables>
+B<--build-parameters>.
+
+=item B<--command-line> | B<-c>
+
+Print the current configuration command line.
+
+=item B<--options> | B<-o>
+
+Print the features, both enabled and disabled, and display defined macro and
+skipped directories where applicable.
+
+=item B<--target> | B<-t>
+
+Print the config attributes for this config target.
+
+=item B<--environment> | B<-e>
+
+Print the environment variables and their values at the time of configuration.
+
+=item B<--make-variables> | B<-m>
+
+Print the main make variables generated in the current configuration
+
+=item B<--build-parameters> | B<-b>
+
+Print the build parameters, i.e. build file and build file templates.
+
+=item B<--reconfigure> | B<--reconf> | B<-r>
+
+Re-run the configuration process.
+
+=item B<--verbose> | B<-v>
+
+Verbose output.
+
+=back
+
+=cut
+
+EOF