Better direct request handling.

* new/build-request.jam
  (directly-requested-properties-adjuster): Redo.

* new/targets.jam
  (main-target.generate-really): Adjust properties here.

* new/virtual-target.jam
  (register-actual-name): New rule.
  (virtual-target.actualize-no-scanner): Call the above, to detected bugs,
  where two virtual target correspond to one Jam target name.


[SVN r17955]

new/build-request.jam

@@ -227,29 +227,45 @@ local rule convert-command-line-element ( e : feature-space )
 # targets.
 rule directly-requested-properties-adjuster
 {
+    self.empty-request-requirements = ;
+    self.all-requests = [ new property-map ] ;
     rule add-requested-property-set ( property-set )
     {        
         local base = [ $(property-set).base ] ;
-        local ep = $(self.direct-request.$(base:J=-)) ;
-        if $(ep) && $(ep) != $(properties) 
-        {            
-            error "Conflicting direct build requests" $(ep) "and" $(properties) ;
+        if ! $(base)
+        {
+            self.empty-request-requirements = $(property-set) ;
         }
         else
         {
-            self.direct-request.$(base:J=-) = $(property-set) ;
-        }                
+            $(self.all-requests).insert $(base) : $(property-set) ;
+        }
     }        
     
     rule adjust ( property-set )
     {
         local base = [ $(property-set).base ] ;
-        local ep = $(self.direct-request.$(base:J=-)) ;
-        if $(ep) 
+        local extra ;
+        local result ; 
+                
+        if $(self.empty-request-requirements)
         {
-            property-set = $(ep) ;
+            extra = $(self.empty-request-requirements) ;
         }
-        return $(property-set) ;
+        else
+        {
+            extra = [ $(self.all-requests).find $(base) ] ;
+        }
+        if $(extra)
+        {
+            result = [ $(property-set).add 
+              [ property-set.create [ $(extra).free ] ] ] ;
+        }
+        else
+        {
+            result = $(property-set) ;
+        }
+        return $(result) ;
     }    
 }
 

new/targets.jam

@@ -265,7 +265,7 @@ rule main-target ( name : project )
 
     rule set-property-adjuster ( property-adjuster )
     {
-        self.direct-request-property-adjuster = $(property-adjuster) ;
+        self.property-adjuster = $(property-adjuster) ;
     }
 
     local rule select-alternatives ( property-set )
@@ -344,12 +344,6 @@ rule main-target ( name : project )
     # Returns the result of calling 'generate' on that alternative.
     rule generate ( property-set )
     {
-        if $(self.property-adjuster)
-        {
-            property-set = [ $(self.property-adjuster).adjust 
-              $(property-set) ] ;
-        }
-                        
         local all-property-sets = [ apply-default-build $(property-set) ] ;
         local result ;
         for local p in $(all-property-sets)
@@ -361,6 +355,12 @@ rule main-target ( name : project )
         
     local rule generate-really ( property-set )
     {    
+        if $(self.property-adjuster)
+        {
+            property-set = [ $(self.property-adjuster).adjust 
+              $(property-set) ] ;
+        }
+                                                
         local best-alternatives = [ select-alternatives $(property-set) ] ;
         if ! $(best-alternatives)
         {

new/virtual-target.jam

@@ -162,6 +162,8 @@ rule virtual-target ( name  # Name of this target -- specifies the name of
         # Do anything only on the first invocation
         if ! $(self.made.$(name)) {
             self.made.$(name) = true ;
+            
+            virtual-target.register-actual-name $(name) : $(__name__) ;            
 
             for local i in $(self.dependencies) {
                 DEPENDS $(name) : [ $(i).actualize ] ;
@@ -738,6 +740,21 @@ rule register ( target )
     return $(result) ;
 }
 
+rule register-actual-name ( actual-name : virtual-target )
+{
+    if $(.actual.$(actual-name))
+    {
+        errors.error "Duplicate name of actual target:" $(actual-name) 
+          : "previous virtual target" [ $(.actual.$(actual-name)).str ] 
+          : "another virtual target" [ $(virtual-target).str ] ;
+    }
+    else
+    {
+        .actual.$(actual-name) = $(virtual-target) ;
+    }        
+}
+
+
 # Traverses the dependency graph of 'target' and return all targets that will
 # be created before this one is created. If root of some dependency graph is
 # found during traversal, it's either included or not, dependencing of the

v2/build/build-request.jam

@@ -227,29 +227,45 @@ local rule convert-command-line-element ( e : feature-space )
 # targets.
 rule directly-requested-properties-adjuster
 {
+    self.empty-request-requirements = ;
+    self.all-requests = [ new property-map ] ;
     rule add-requested-property-set ( property-set )
     {        
         local base = [ $(property-set).base ] ;
-        local ep = $(self.direct-request.$(base:J=-)) ;
-        if $(ep) && $(ep) != $(properties) 
-        {            
-            error "Conflicting direct build requests" $(ep) "and" $(properties) ;
+        if ! $(base)
+        {
+            self.empty-request-requirements = $(property-set) ;
         }
         else
         {
-            self.direct-request.$(base:J=-) = $(property-set) ;
-        }                
+            $(self.all-requests).insert $(base) : $(property-set) ;
+        }
     }        
     
     rule adjust ( property-set )
     {
         local base = [ $(property-set).base ] ;
-        local ep = $(self.direct-request.$(base:J=-)) ;
-        if $(ep) 
+        local extra ;
+        local result ; 
+                
+        if $(self.empty-request-requirements)
         {
-            property-set = $(ep) ;
+            extra = $(self.empty-request-requirements) ;
         }
-        return $(property-set) ;
+        else
+        {
+            extra = [ $(self.all-requests).find $(base) ] ;
+        }
+        if $(extra)
+        {
+            result = [ $(property-set).add 
+              [ property-set.create [ $(extra).free ] ] ] ;
+        }
+        else
+        {
+            result = $(property-set) ;
+        }
+        return $(result) ;
     }    
 }
 

v2/build/targets.jam

@@ -265,7 +265,7 @@ rule main-target ( name : project )
 
     rule set-property-adjuster ( property-adjuster )
     {
-        self.direct-request-property-adjuster = $(property-adjuster) ;
+        self.property-adjuster = $(property-adjuster) ;
     }
 
     local rule select-alternatives ( property-set )
@@ -344,12 +344,6 @@ rule main-target ( name : project )
     # Returns the result of calling 'generate' on that alternative.
     rule generate ( property-set )
     {
-        if $(self.property-adjuster)
-        {
-            property-set = [ $(self.property-adjuster).adjust 
-              $(property-set) ] ;
-        }
-                        
         local all-property-sets = [ apply-default-build $(property-set) ] ;
         local result ;
         for local p in $(all-property-sets)
@@ -361,6 +355,12 @@ rule main-target ( name : project )
         
     local rule generate-really ( property-set )
     {    
+        if $(self.property-adjuster)
+        {
+            property-set = [ $(self.property-adjuster).adjust 
+              $(property-set) ] ;
+        }
+                                                
         local best-alternatives = [ select-alternatives $(property-set) ] ;
         if ! $(best-alternatives)
         {

v2/build/virtual-target.jam

@@ -162,6 +162,8 @@ rule virtual-target ( name  # Name of this target -- specifies the name of
         # Do anything only on the first invocation
         if ! $(self.made.$(name)) {
             self.made.$(name) = true ;
+            
+            virtual-target.register-actual-name $(name) : $(__name__) ;            
 
             for local i in $(self.dependencies) {
                 DEPENDS $(name) : [ $(i).actualize ] ;
@@ -738,6 +740,21 @@ rule register ( target )
     return $(result) ;
 }
 
+rule register-actual-name ( actual-name : virtual-target )
+{
+    if $(.actual.$(actual-name))
+    {
+        errors.error "Duplicate name of actual target:" $(actual-name) 
+          : "previous virtual target" [ $(.actual.$(actual-name)).str ] 
+          : "another virtual target" [ $(virtual-target).str ] ;
+    }
+    else
+    {
+        .actual.$(actual-name) = $(virtual-target) ;
+    }        
+}
+
+
 # Traverses the dependency graph of 'target' and return all targets that will
 # be created before this one is created. If root of some dependency graph is
 # found during traversal, it's either included or not, dependencing of the