diff --git a/v2/build/alias.jam b/v2/build/alias.jam
index 9df09f125..25344063f 100644
--- a/v2/build/alias.jam
+++ b/v2/build/alias.jam
@@ -49,6 +49,11 @@ class alias-target-class : basic-target
     rule check-for-link-compatibility ( * : * )
     {
     }
+    
+    rule check-for-unused-sources ( * : * )
+    {
+    }
+    
         
     rule compute-usage-requirements ( subvariant ) 
     {
diff --git a/v2/build/generators.jam b/v2/build/generators.jam
index ce2642ebd..8908db008 100644
--- a/v2/build/generators.jam
+++ b/v2/build/generators.jam
@@ -451,6 +451,7 @@ class generator
         for local t in $(targets)
         {
             $(t).action $(a) ;
+            $(t).set-intermediate true ;
         }       
         
         return [ sequence.transform virtual-target.register : $(targets) ] ;
@@ -1007,7 +1008,20 @@ rule construct ( project name ? : target-type multiple ? : property-set * : sour
     {
         ensure-type $(sources) ;
     }
-    
+
+    if ! $(.construct-stack)
+    {
+        local sources2 ;
+        for local s in $(sources)
+        {
+            if ! [ $(s).intermediate ] 
+            {
+                sources2 += $(s) ;
+            }
+        }
+        sources = $(sources2) ;
+    }
+        
     .construct-stack += 1 ;
 
     increase-indent ;
@@ -1037,6 +1051,7 @@ rule construct ( project name ? : target-type multiple ? : property-set * : sour
         
     .construct-stack = $(.construct-stack[2-]) ;
 
+    # For all targets of 'allowed-type', reset the 'intermediate' attribute.
     if ! $(.construct-stack) && $(allowed-type) != * # This is first invocation in stack
     {
         local result2 ;
@@ -1052,14 +1067,12 @@ rule construct ( project name ? : target-type multiple ? : property-set * : sour
             # checking for unused sources a bit harder.
             if $(type) = $(target-type) || [ type.is-derived $(type) $(allowed-type) ]
             {
-                  result2 += $(t) ;
+                $(t).set-intermediate ;
             }
         }                
-        return $(result2) ;
     } 
-    else
-    {                            
-        return $(result) ;        
-    }        
+            
+    
+    return $(result) ;        
 }
 
diff --git a/v2/build/targets.jam b/v2/build/targets.jam
index ad039d7cf..233213cff 100644
--- a/v2/build/targets.jam
+++ b/v2/build/targets.jam
@@ -978,9 +978,12 @@ class basic-target : abstract-target
     }
     
         
-    # Check that each source virtual target is either directly present in the
-    # result, or is in dependency graph of some returned virtual target. 
-    # If this is not the case, issues a warning. 
+    # Check that each source virtual target which is not marked as intermediate
+    # is present dependency graph of 'result'. 
+    # If this is not the case, issues a warning.
+    # Sources which are directly presentin result are not considered used, and 
+    # a warning will be issued for them as well.
+    #
     # Note that 'result' *can* be empty. For
     # example, in this use case:
     #    alias platform-sources ;
@@ -988,18 +991,30 @@ class basic-target : abstract-target
     # result will be empty in the first case.
     local rule check-for-unused-sources ( result * : sources * )
     {
+        local isources ;
+        for local i in $(sources)
+        {
+            if ! [ $(i).intermediate ] 
+            {
+                isources += $(i) ;
+            }
+        }
+        sources = $(isources) ;
+        
         local used-sources ;
         for local r in $(result)
         {
             used-sources += [ virtual-target.traverse $(r) : include-roots : 1 ] ;
         }
+        # Consider sources which are bypassed as unused
+        used-sources = [ set.difference $(used-sources) : $(result) ] ;
         
         local unused = [ set.difference $(sources) : $(used-sources) ] ;
         if $(unused)
         {
             for local u in $(unused)
             {               
-                errors.warning "Unused source" [ $(u).str ] "in main target" [ full-name ] ;                    
+                errors.warning "Unused source" [ $(u).str ] "in main target" [ full-name ] ;
             }                            
         }                                                       
     }
diff --git a/v2/build/virtual-target.jam b/v2/build/virtual-target.jam
index d07ee970f..2767ae3df 100644
--- a/v2/build/virtual-target.jam
+++ b/v2/build/virtual-target.jam
@@ -258,6 +258,18 @@ class abstract-file-target : virtual-target
         }
         return $(self.root) ;
     }
+    
+    rule set-intermediate ( value ? )
+    {
+        self.intermediate = $(value) ;
+    }
+    
+    rule intermediate ( )      
+    {
+        return $(self.intermediate) ;
+    }
+    
+    
 
     # Gets or sets the subvariant which created this target. Subvariant
     # is set when target is brought into existance, and is never changed
@@ -913,6 +925,7 @@ rule clone-template ( target dont-recurse ? : new-source : new-project )
     {
         local cloned = [ new file-target $(new-name) : [ $(target).type ] :
           $(new-project) ] ;
+        $(cloned).set-intermediate [ $(target).intermediate ] ;
 
         if ! $(dont-recurse) && [ $(target).action ]
         {
diff --git a/v2/tools/builtin.jam b/v2/tools/builtin.jam
index fd291e155..b67e82a3b 100644
--- a/v2/tools/builtin.jam
+++ b/v2/tools/builtin.jam
@@ -631,6 +631,7 @@ class linking-generator : generator
     {   
         local libs = [ $(property-set).get <library> ] ;
         sources += $(libs:G=) ;
+
         
         if [ $(property-set).get <hardcode-dll-paths> ] = true
         {
diff --git a/v2/tools/stage.jam b/v2/tools/stage.jam
index ce834e93c..9d45863bd 100644
--- a/v2/tools/stage.jam
+++ b/v2/tools/stage.jam
@@ -146,7 +146,7 @@ class stage-target-class : basic-target
         local result ;
         for local i in $(source-targets)
         {
-            if [ $(i).type ] != SEARCHED_LIB
+            if ! [ $(i).intermediate ] && [ $(i).type ] != SEARCHED_LIB
             {
                 local staged-targets ;