prj-attr.adb (Package_Node_Id_Of): Returns Unknown_Package when package is not known

2007-12-19  Vincent Celier  <celier@adacore.com>

	* prj-attr.adb (Package_Node_Id_Of): Returns Unknown_Package when
	package is not known

	* prj-attr.ads (Unknown_Package): New constant
	Do not crash when an unknown package is in several projects

	* prj-dect.adb (Parse_Package_Declaration): Mark an unknown package as
	ignored

	* prj-nmsc.adb (Check): Remove obsolete code related to no longer
	existing package Language_Processing.

From-SVN: r131078

gcc/ada/prj-attr.adb

@@ -602,7 +602,11 @@ package body Prj.Attr is
    begin
       for Index in Package_Attributes.First .. Package_Attributes.Last loop
          if Package_Attributes.Table (Index).Name = Name then
-            return (Value => Index);
+            if Package_Attributes.Table (Index).Known then
+               return (Value => Index);
+            else
+               return Unknown_Package;
+            end if;
          end if;
       end loop;
 
@@ -689,6 +693,7 @@ package body Prj.Attr is
          Attr_Kind      => Real_Attr_Kind,
          Read_Only      => False,
          Next           => First_Attr);
+
       Package_Attributes.Table (In_Package.Value).First_Attribute :=
         Attrs.Last;
    end Register_New_Attribute;

gcc/ada/prj-attr.ads

@@ -171,6 +171,9 @@ package Prj.Attr is
    Empty_Package : constant Package_Node_Id;
    --  Default value of Package_Node_Id objects
 
+   Unknown_Package : constant Package_Node_Id;
+   --  Value of an unknown package that has been found but is unknown.
+
    procedure Register_New_Package (Name : String; Id : out Package_Node_Id);
    --  Add a new package. Fails if Name (the package name) is empty or is
    --  already the name of a package, and set Id to Empty_Package,
@@ -250,11 +253,11 @@ private
    end record;
    --  Full declaration of self-initialized private type
 
-   Empty_Pkg : constant Pkg_Node_Id := Package_Node_Low_Bound;
-
-   Empty_Package : constant Package_Node_Id := (Value => Empty_Pkg);
-
-   First_Package : constant Pkg_Node_Id := Package_Node_Low_Bound + 1;
+   Empty_Pkg       : constant Pkg_Node_Id     := Package_Node_Low_Bound;
+   Empty_Package   : constant Package_Node_Id := (Value => Empty_Pkg);
+   Unknown_Pkg     : constant Pkg_Node_Id     := Package_Node_High_Bound;
+   Unknown_Package : constant Package_Node_Id := (Value => Unknown_Pkg);
+   First_Package   : constant Pkg_Node_Id     := Package_Node_Low_Bound + 1;
 
    First_Package_Node_Id  : constant Package_Node_Id :=
                               (Value => First_Package);

gcc/ada/prj-dect.adb

@@ -981,10 +981,7 @@ package body Prj.Dect is
 
          Current_Package := Package_Node_Id_Of (Token_Name);
 
-         if Current_Package  /= Empty_Package then
-            First_Attribute := First_Attribute_Of (Current_Package);
-
-         else
+         if Current_Package = Empty_Package then
             if not Quiet_Output then
                Error_Msg ("?""" &
                           Get_Name_String
@@ -1001,6 +998,16 @@ package body Prj.Dect is
             --  Add the unknown package in the list of packages
 
             Add_Unknown_Package (Token_Name, Current_Package);
+
+         elsif Current_Package = Unknown_Package then
+
+            --  Set the package declaration to "ignored" so that it is not
+            --  processed by Prj.Proc.Process.
+
+            Set_Expression_Kind_Of (Package_Declaration, In_Tree, Ignored);
+
+         else
+            First_Attribute := First_Attribute_Of (Current_Package);
          end if;
 
          Set_Package_Id_Of

gcc/ada/prj-nmsc.adb

@@ -714,8 +714,6 @@ package body Prj.Nmsc is
    is
       Data      : Project_Data := In_Tree.Projects.Table (Project);
       Extending : Boolean := False;
-      Lang_Proc_Pkg   : Package_Id;
-      Linker_Name     : Variable_Value;
 
    begin
       Nmsc.When_No_Sources := When_No_Sources;
@@ -840,33 +838,6 @@ package body Prj.Nmsc is
 
       Get_Mains (Project, In_Tree, Data);
 
-      --  In multi-language mode, check if there is a linker specified
-
-      if Get_Mode = Multi_Language then
-         Lang_Proc_Pkg :=
-           Value_Of (Name_Language_Processing, Data.Decl.Packages, In_Tree);
-
-         if Lang_Proc_Pkg /= No_Package then
-            Linker_Name :=
-              Value_Of
-                (Variable_Name => Name_Linker,
-                 In_Variables  =>
-                   In_Tree.Packages.Table (Lang_Proc_Pkg).Decl.Attributes,
-                 In_Tree       => In_Tree);
-
-            if Linker_Name /= Nil_Variable_Value then
-               Get_Name_String (Linker_Name.Value);
-
-               if Name_Len > 0 then
-                  --  A non empty linker name was specified
-
-                  Data.Linker_Name := File_Name_Type (Linker_Name.Value);
-
-               end if;
-            end if;
-         end if;
-      end if;
-
       --  Update the project data in the Projects table
 
       In_Tree.Projects.Table (Project) := Data;