Configure - Rename BASE to DEFAULTS and add a few inheritable BASEs

These BASE templates are intended to hold values that are common for
all configuration variants for whole families of configurations.

So far, three "families" are identified: Unix, Windows and VMS, mostly
characterised by the build system they currently use.
Reviewed-by: NAndy Polyakov <appro@openssl.org>

Configurations/00-base-templates.conf

 # -*- Mode: perl -*-
 %targets=(
-    BASE => {
+    DEFAULTS => {
 	template	=> 1,
 
 	cflags		=> "",
@@ -39,8 +39,35 @@
 	shared_ldflag	=> "",
 	shared_rcflag	=> "",
 	shared_extension	=> "",
+
 	build_scheme	=> "unixmake",
-	build_file      => "Makefile",
+	build_file	=> "Makefile",
+    },
+
+    BASE_common => {
+    },
+
+    BASE_unix => {
+        inherit_from    => [ "BASE_common" ],
+        template        => 1,
+
+        build_scheme    => "unixmake",
+        build_file      => "Makefile",
+    },
+
+    BASE_Windows => {
+        inherit_from    => [ "BASE_common" ],
+        template        => 1,
+
+        build_scheme    => [ "mk1mf" ],
+    },
+
+    BASE_VMS => {
+        inherit_from    => [ "BASE_common" ],
+        template        => 1,
+
+        build_file       => "descrip.mms",
+        build_scheme     => [ "unified", "VMS" ],
     },
 
     uplink_common => {

Configure

@@ -136,7 +136,6 @@ my $apitable = {
     "0.9.8" => "0x00908000L",
 };
 
-my $base_target = "BASE";   # The template that all other inherit from
 our %table = ();
 our %config = ();
 
@@ -835,13 +834,11 @@ if ($d) {
     }
 }
 $config{target} = $target;
-delete $table{$base_target}->{template}; # or the next test will fail.
 my %target = resolve_config($target);
 
 &usage if (!%target || $target{template});
 
-# Set up defaults
-my %target = ( %{$table{$base_target}}, %target );
+%target = ( %{$table{DEFAULTS}}, %target );
 
 $target{exe_extension}="";
 $target{exe_extension}=".exe" if ($config{target} eq "DJGPP"
@@ -1047,7 +1044,7 @@ if ($target{sys_id} ne "")
 	}
 
 unless ($disabled{asm}) {
-    $target{cpuid_asm_src}=$table{BASE}->{cpuid_asm_src} if ($config{processor} eq "386");
+    $target{cpuid_asm_src}=$table{DEFAULTS}->{cpuid_asm_src} if ($config{processor} eq "386");
     $target{bn_asm_src} =~ s/\w+-gf2m.c// if (defined($disabled{ec2m}));
 
     # bn-586 is the only one implementing bn_*_part_words
@@ -1070,7 +1067,7 @@ unless ($disabled{asm}) {
     if ($target{md5_asm_src}) {
 	push @{$config{defines}}, "MD5_ASM";
     }
-    $target{cast_asm_src}=$table{BASE}->{cast_asm_src} unless $disabled{pic}; # CAST assembler is not PIC
+    $target{cast_asm_src}=$table{DEFAULTS}->{cast_asm_src} unless $disabled{pic}; # CAST assembler is not PIC
     if ($target{rmd160_asm_src}) {
 	push @{$config{defines}}, "RMD160_ASM";
     }
@@ -1087,7 +1084,7 @@ unless ($disabled{asm}) {
     }
     if ($target{wp_asm_src} =~ /mmx/) {
         if ($config{processor} eq "386") {
-	    $target{wp_asm_src}=$table{BASE}->{wp_asm_src};
+	    $target{wp_asm_src}=$table{DEFAULTS}->{wp_asm_src};
 	} elsif (!$disabled{"whirlpool"}) {
 	    $config{cflags}.=" -DWHIRLPOOL_ASM";
 	}