Index: tools/build/v2/build/configure.jam
===================================================================
--- tools/build/v2/build/configure.jam	(revision 71198)
+++ tools/build/v2/build/configure.jam	(working copy)
@@ -123,12 +123,13 @@
 {   
     local result ;
            
-    if ! $(retry) && ! $(.$(what)-tested.$(ps))
+    local targets = [ targets.generate-from-reference 
+        $(metatarget-reference) : $(project) : $(ps) ] ;
+    local targets-str = $(targets[2-]:J=$) ;
+    if ! $(retry) && ! $(.$(targets-str)-tested)
     {        
-        .$(what)-tested.$(ps) = true ;
+        .$(targets-str)-tested = true ;
         
-        local targets = [ targets.generate-from-reference 
-            $(metatarget-reference) : $(project) : $(ps) ] ;
         
         local jam-targets ;
         for local t in $(targets[2-])
@@ -146,7 +147,7 @@
             if [ UPDATE_NOW $(jam-targets) :
                  $(.log-fd) : ignore-minus-n : ignore-minus-q ] 
             {
-                .$(what)-supported.$(ps) = yes ;
+                .$(targets-str)-supported = yes ;
                 result = true ;
                 log-check-result "$(x) : yes" ;
             }        
@@ -159,7 +160,7 @@
     }    
     else
     {
-        return $(.$(what)-supported.$(ps)) ;
+        return $(.$(targets-str)-supported) ;
     }
 }