Restore makedepend capabilities for Windows and VMS

This got lost somehow.  The methods to do makedepend on Windows and
VMS are hard coded for cl (Windows) and CC/DECC (VMS), because that's
what we currently support natively.

Reviewed-by: Andy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4907)

1 files changed, 10 insertions, 3 deletions

diff --git a/Configure b/Configure
index 5abbd72a97..ba646f030a 100755
--- a/Configure
+++ b/Configure
@@ -1279,12 +1279,19 @@ unless ($disabled{asm}) {
 
 my %predefined = compiler_predefined($target{cc});
 
+# Check for makedepend capabilities.
 if (!$disabled{makedepend}) {
-    # We know that GNU C version 3 and up as well as all clang
-    # versions support dependency generation
-    if ($predefined{__GNUC__} >= 3) {
+    if ($config{target} =~ /^(VC|vms)-/) {
+        # For VC- and vms- targets, there's nothing more to do here.  The
+        # functionality is hard coded in the corresponding build files for
+        # cl (Windows) and CC/DECC (VMS).
+    } elsif ($predefined{__GNUC__} >= 3) {
+        # We know that GNU C version 3 and up as well as all clang
+        # versions support dependency generation
         $config{makedepprog} = "\$(CROSS_COMPILE)$target{cc}";
     } else {
+        # In all other cases, we look for 'makedepend', and disable the
+        # capability if not found.
         $config{makedepprog} = which('makedepend');
         $disabled{makedepend} = "unavailable" unless $config{makedepprog};
     }