==== Patch <embed-manifest> level 1
Source: [No source]
Target: b8fc166d-592f-0410-95f2-cb63ce0dd405:/trunk/tools/build/v2:50869
        (http://svn.boost.org/svn/boost/trunk)
Log:
Avoiding duplicate target error when using <embed-manifest>off.
=== build/virtual-target.jam
==================================================================
--- build/virtual-target.jam	(revision 50869)

+++ build/virtual-target.jam	(patch embed-manifest level 1)

@@ -675,6 +675,7 @@

     import property-set ;
     import indirect ;
     import path ;
+    import set : difference ;
 
     rule __init__ ( sources * : action-name + : property-set ? )
     {
@@ -700,6 +701,12 @@

         self.targets += $(targets) ;
     }
 
+    rule replace-targets ( old-targets * : new-targets * )
+    {
+        self.targets = [ set.difference $(self.targets) : $(old-targets) ] ;
+        self.targets += $(new-targets) ;
+    }
+
     rule targets ( )
     {
         return $(self.targets) ;
=== tools/msvc.jam
==================================================================
--- tools/msvc.jam	(revision 50869)

+++ tools/msvc.jam	(patch embed-manifest level 1)

@@ -981,16 +981,22 @@

     {
         local result = [ linking-generator.generated-targets $(sources)
           : $(property-set) : $(project) $(name) ] ;
-        if [ $(property-set).get <embed-manifest> ] = "off"
+
+        if $(result)
         {
-            if ! $(name)
+            local name = [ $(result[0]).name ] ;
+            local action = [ $(result[0]).action ] ;
+
+            if [ $(property-set).get <embed-manifest> ] = "off"
             {
-                name = [ determine-output-name $(sources) ] ;
+                local target = [ class.new file-target $(name) : MANIFEST : $(project) : $(action) ] ;
+                local registered-target = [ virtual-target.register $(target) ] ;
+                if $(action) && ( $(target) != $(registered-target) )
+                {
+                    $(action).replace-targets $(target) : $(registered-target) ;
+                }
+                result += $(registered-target) ;
             }
-            
-            local action = [ $(result[0]).action ] ;
-            result += [ virtual-target.register
-                [ class.new file-target $(name) : MANIFEST : $(project) : $(action) ] ] ;
         }
         return $(result) ;
     }

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==== END SVK PATCH BLOCK ====