Apps: divide the modules in direct command modules, support library and init

Most modules are direct implementations of openssl application
sub-commands, but some constitute a support library, which can be used
by more than one program (and is, incidently, by test/uitest).

For practical purposes, we place the support library modules in a
private, static library.

Finally, there are some modules that don't have direct references in
the rest of the apps code, but are still crucial.  See them as some
kind of extra crt0 or similar for your platform.

Inspiration from David von Oheimb
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5222)

Configurations/00-base-templates.conf

@@ -11,6 +11,7 @@ my %targets=(
 	thread_defines	=> [],
 
 	apps_aux_src	=> "",
+	apps_init_src	=> "",
 	cpuid_asm_src	=> "mem_clr.c",
 	uplink_aux_src	=> "",
 	bn_asm_src	=> "bn_asm.c",
@@ -134,7 +135,7 @@ my %targets=(
 
     uplink_common => {
 	template	=> 1,
-	apps_aux_src	=> add("../ms/applink.c"),
+	apps_init_src	=> add("../ms/applink.c"),
 	uplink_aux_src	=> add("../ms/uplink.c"),
 	defines		=> add("OPENSSL_USE_APPLINK"),
     },

Configurations/10-main.conf

@@ -1852,7 +1852,8 @@ my %targets = (
         dso_scheme       => "vms",
         thread_scheme    => "pthreads",
 
-        apps_aux_src     => "vms_decc_init.c vms_term_sock.c",
+        apps_aux_src     => "vms_term_sock.c",
+        apps_init_src    => "vms_decc_init.c",
     },
 
     "vms-alpha" => {

Configurations/README

@@ -212,8 +212,14 @@ In each table entry, the following keys are significant:
                                                 export vars as
                                                 accessor functions.
 
-        apps_extra_src  => Extra source to build apps/openssl, as
-                           needed by the target.
+        apps_aux_src    => Extra source to build apps/openssl and other
+                           apps, as needed by the target and that can be
+                           collected in a library.
+        apps_init_src   => Init source to build apps/openssl and other
+                           apps, as needed by the target.  This code
+                           cannot be placed in a library, as the rest
+                           of the code isn't expected to link to it
+                           explicitely.
         cpuid_asm_src   => assembler implementation of cpuid code as
                            well as OPENSSL_cleanse().
                            Default to mem_clr.c

Configurations/windows-checker.pm

@@ -6,7 +6,7 @@ use Config;
 # we expect for the platform
 use File::Spec::Functions qw(:DEFAULT rel2abs);
 
-if (rel2abs('.') !~ m|\\|) {
+if (!$ENV{CONFIGURE_INSIST} && rel2abs('.') !~ m|\\|) {
     die <<EOF;
 
 ******************************************************************************

apps/build.info

 {- our $tsget_name = $config{target} =~ /^(VC|vms)-/ ? "tsget.pl" : "tsget";
    our @apps_openssl_src =
-       ( qw(openssl.c
+       qw(openssl.c
           asn1pars.c ca.c ciphers.c cms.c crl.c crl2p7.c dgst.c dhparam.c
           dsa.c dsaparam.c ec.c ecparam.c enc.c engine.c errstr.c gendsa.c
           genpkey.c genrsa.c nseq.c ocsp.c passwd.c pkcs12.c pkcs7.c pkcs8.c
           pkey.c pkeyparam.c pkeyutl.c prime.c rand.c req.c rsa.c rsautl.c
           s_client.c s_server.c s_time.c sess_id.c smime.c speed.c spkac.c
-            srp.c ts.c verify.c version.c x509.c rehash.c storeutl.c
-            apps.c opt.c s_cb.c s_socket.c
-            app_rand.c),
+          srp.c ts.c verify.c version.c x509.c rehash.c storeutl.c);
+   our @apps_lib_src =
+       ( qw(apps.c opt.c s_cb.c s_socket.c app_rand.c),
          split(/\s+/, $target{apps_aux_src}) );
+   our @apps_init_src = split(/\s+/, $target{apps_init_src});
    "" -}
 IF[{- !$disabled{apps} -}]
+  LIBS_NO_INST=libapps.a
+  SOURCE[libapps.a]={- join(" ", @apps_lib_src) -}
+  INCLUDE[libapps.a]=.. ../include
+
   PROGRAMS=openssl
+  SOURCE[openssl]={- join(" ", @apps_init_src) -}
   SOURCE[openssl]={- join(" ", @apps_openssl_src) -}
   INCLUDE[openssl]=.. ../include
-  DEPEND[openssl]=../libssl
+  DEPEND[openssl]=libapps.a ../libssl
 
   {- join("\n  ", map { (my $x = $_) =~ s|\.c$|.o|; "DEPEND[$x]=progs.h" }
                   @apps_openssl_src) -}