Refactor file writing - make configdata.pm the info center for "reconf"

Now that configdata.pm is the centre of information, use that instead
of Makefile to figure out reconfiguration parameters.  This will help
future development with different Makefile file names.

The code to read necessary configuration data from Makefile is retained
for an easy transition to configdata.pm based information gathering.  It
will be removed later on.

This change includes moving the variable $cross_compile_prefix to %config.

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Viktor Dukhovni <viktor@openssl.org>

Configure

diff --git a/Configure b/Configure
index 4f32e4e..5e973c6 100755
--- a/Configure
+++ b/Configure
@@ -181,7 +181,7 @@
 my $libdir="";
 my $exe_ext="";
 my $install_prefix= "$ENV{'INSTALL_PREFIX'}";
-my $cross_compile_prefix="";
+$config{cross_compile_prefix}="";
 my $fipslibdir="/usr/local/ssl/fips-2.0/lib/";
 my $nofipscanistercheck=0;
 my $baseaddr="0xFB00000";
@@ -406,36 +406,54 @@
 my @argvcopy=@ARGV;
 
 if (grep /^reconf(igure)?$/, @argvcopy) {
-    if (open IN, "<$Makefile") {
-	while (<IN>) {
-	    chomp;
-	    if (/^CONFIGURE_ARGS=\s*(.*)\s*/) {
-		my $line = $1;
-		if ($line =~ /^\s*\(/) {
-		    # New form perl expression saved in Makefile, eval it
-		    @argvcopy = eval $line;
-		} else {
-		    # Older form, we split the string and hope for the best
-		    @argvcopy = split /\s+/, $line;
-		}
-		die "Incorrect data to reconfigure, please do a normal configuration\n"
-		    if (grep(/^reconf/,@argvcopy));
-	    } elsif (/^CROSS_COMPILE=\s*(.*)/) {
-		$ENV{CROSS_COMPILE}=$1;
-	    } elsif (/^CC=\s*(?:\$\(CROSS_COMPILE\))?(.*?)$/) {
-		$ENV{CC}=$1;
-	    }
+    if (-f "./configdata.pm") {
+	my $file = "./configdata.pm";
+	unless (my $return = do $file) {
+	    die "couldn't parse $file: $@" if $@;
+            die "couldn't do $file: $!"    unless defined $return;
+            die "couldn't run $file"       unless $return;
 	}
+
+	@argvcopy = defined($configdata::config{perlargv}) ?
+	    @{$configdata::config{perlargv}} : ();
+	die "Incorrect data to reconfigure, please do a normal configuration\n"
+	    if (grep(/^reconf/,@argvcopy));
+	$ENV{CROSS_COMPILE} = $configdata::config{cross_compile_prefix}
+	    if defined($configdata::config{cross_compile_prefix});
+	$ENV{CROSS_COMPILE} = $configdata::config{cc}
+	    if defined($configdata::config{cc});
+
 	print "Reconfiguring with: ", join(" ",@argvcopy), "\n";
 	print "    CROSS_COMPILE = ",$ENV{CROSS_COMPILE},"\n"
 	    if $ENV{CROSS_COMPILE};
 	print "    CC = ",$ENV{CC},"\n" if $ENV{CC};
-	close IN;
+    } elsif (open IN, "<Makefile") {
+        #
+        # THIS SECTION IS TEMPORARY, it helps transitioning from Makefile
+        # centered information gathering the reading configdata.pm
+        #
+        while (<IN>) {
+            chomp;
+            if (/^CONFIGURE_ARGS=\s*(.*)\s*/) {
+                # Older form, we split the string and hope for the best
+                @argvcopy = split /\s+/, $_;
+                die "Incorrect data to reconfigure, please do a normal configuration\n"
+                    if (grep(/^reconf/,@argvcopy));
+            } elsif (/^CROSS_COMPILE=\s*(.*)/) {
+                $ENV{CROSS_COMPILE}=$1;
+            } elsif (/^CC=\s*(?:\$\(CROSS_COMPILE\))?(.*?)$/) {
+                $ENV{CC}=$1;
+            }
+        }
+        #
+        # END OF TEMPORARY SECTION
+        #
     } else {
 	die "Insufficient data to reconfigure, please do a normal configuration\n";
     }
 }
 
+$config{perlargv} = [ @argvcopy ];
 
 my %unsupported_options = ();
 foreach (@argvcopy)
@@ -579,7 +597,7 @@
 			}
 		elsif (/^--cross-compile-prefix=(.*)$/)
 			{
-			$cross_compile_prefix=$1;
+			$config{cross_compile_prefix}=$1;
 			}
 		elsif (/^--config=(.*)$/)
 			{
@@ -768,7 +786,8 @@
 $config{perl}	= $ENV{'PERL'} || which("perl5") || which("perl") || "perl";
 my $make	= $ENV{'MAKE'} || "make";
 
-$cross_compile_prefix=$ENV{'CROSS_COMPILE'} if $cross_compile_prefix eq "";
+$config{cross_compile_prefix} = $ENV{'CROSS_COMPILE'}
+    if $config{cross_compile_prefix} eq "";
 
 $config{prefix} = "/usr/local" if !$config{prefix};
 $config{openssldir} = "ssl" if !$config{openssldir};
@@ -1007,7 +1026,7 @@
 if ($target{sys_id} ne "")
 	{
 	#$cflags="-DOPENSSL_SYS_$target{sys_id} $cflags";
-	push @{$config{openssl_sys_defines}}="OPENSSL_SYS_$target{sys_id}";
+	push @{$config{openssl_sys_defines}}, "OPENSSL_SYS_$target{sys_id}";
 	}
 
 if ($target{ranlib} eq "")
@@ -1292,9 +1311,9 @@
 	s/^OPTIONS=.*$/OPTIONS=$config{options}/;
 	my $argvstring = "(".join(", ", map { quotify("perl", $_) } @argvcopy).")";
 	s/^CONFIGURE_ARGS=.*$/CONFIGURE_ARGS=$argvstring/;
-	if ($cross_compile_prefix)
+	if ($config{cross_compile_prefix})
 		{
-		s/^CC=.*$/CROSS_COMPILE= $cross_compile_prefix\nCC= \$\(CROSS_COMPILE\)$target{cc}/;
+		s/^CC=.*$/CROSS_COMPILE= $config{cross_compile_prefix}\nCC= \$\(CROSS_COMPILE\)$target{cc}/;
 		s/^AR=\s*/AR= \$\(CROSS_COMPILE\)/;
 		s/^NM=\s*/NM= \$\(CROSS_COMPILE\)/;
 		s/^RANLIB=\s*/RANLIB= \$\(CROSS_COMPILE\)/;