------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                             P R J . N M S C                              --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 2000-2004 Free Software Foundation, Inc.          --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
-- MA 02111-1307, USA.                                                      --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

with Err_Vars; use Err_Vars;
with Fmap;     use Fmap;
with Hostparm;
with MLib.Tgt;
with Namet;    use Namet;
with Osint;    use Osint;
with Output;   use Output;
with MLib.Tgt; use MLib.Tgt;
with Prj.Com;  use Prj.Com;
with Prj.Env;  use Prj.Env;
with Prj.Err;
with Prj.Util; use Prj.Util;
with Sinput.P;
with Snames;   use Snames;
with Types;    use Types;

with Ada.Characters.Handling;    use Ada.Characters.Handling;
with Ada.Strings;                use Ada.Strings;
with Ada.Strings.Fixed;          use Ada.Strings.Fixed;
with Ada.Strings.Maps.Constants; use Ada.Strings.Maps.Constants;

with GNAT.Case_Util;             use GNAT.Case_Util;
with GNAT.Directory_Operations;  use GNAT.Directory_Operations;
with GNAT.OS_Lib;                use GNAT.OS_Lib;
with GNAT.HTable;

package body Prj.Nmsc is

   Error_Report    : Put_Line_Access := null;

   ALI_Suffix : constant String := ".ali";

   type Name_Location is record
      Name     : Name_Id;
      Location : Source_Ptr;
      Found    : Boolean := False;
   end record;
   --  Information about file names found in string list attribute
   --  Source_Files or in a source list file, stored in hash table
   --  Source_Names, used by procedure
   --  Ada_Check.Get_Path_Names_And_Record_Sources.

   No_Name_Location : constant Name_Location :=
     (Name => No_Name, Location => No_Location, Found => False);

   package Source_Names is new GNAT.HTable.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Name_Location,
      No_Element => No_Name_Location,
      Key        => Name_Id,
      Hash       => Hash,
      Equal      => "=");
   --  Hash table to store file names found in string list attribute
   --  Source_Files or in a source list file, stored in hash table
   --  Source_Names, used by procedure
   --  Ada_Check.Get_Path_Names_And_Record_Sources.

   package Recursive_Dirs is new GNAT.HTable.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Boolean,
      No_Element => False,
      Key        => Name_Id,
      Hash       => Hash,
      Equal      => "=");
   --  Hash table to store recursive source directories, to avoid looking
   --  several times, and to avoid cycles that may be introduced by symbolic
   --  links.

   function ALI_File_Name (Source : String) return String;
   --  Return the ALI file name corresponding to a source.

   procedure Check_Ada_Naming_Scheme
     (Project : Project_Id;
      Naming  : Naming_Data);
   --  Check that the package Naming is correct.

   procedure Check_Ada_Name
     (Name : String;
      Unit : out Name_Id);
   --  Check that a name is a valid Ada unit name.

   procedure Error_Msg
     (Project       : Project_Id;
      Msg           : String;
      Flag_Location : Source_Ptr);
   --  Output an error message. If Error_Report is null, simply call
   --  Prj.Err.Error_Msg. Otherwise, disregard Flag_Location and use
   --  Error_Report.

   procedure Get_Unit
     (Canonical_File_Name : Name_Id;
      Naming              : Naming_Data;
      Unit_Name           : out Name_Id;
      Unit_Kind           : out Spec_Or_Body;
      Needs_Pragma        : out Boolean);
   --  Find out, from a file name, the unit name, the unit kind and if a
   --  specific SFN pragma is needed. If the file name corresponds to no
   --  unit, then Unit_Name will be No_Name.

   function Is_Illegal_Suffix
     (Suffix                          : String;
      Dot_Replacement_Is_A_Single_Dot : Boolean) return Boolean;
   --  Returns True if the string Suffix cannot be used as
   --  a spec suffix, a body suffix or a separate suffix.

   procedure Record_Source
     (File_Name       : Name_Id;
      Path_Name       : Name_Id;
      Project         : Project_Id;
      Data            : in out Project_Data;
      Location        : Source_Ptr;
      Current_Source  : in out String_List_Id;
      Source_Recorded : in out Boolean;
      Trusted_Mode    : Boolean);
   --  Put a unit in the list of units of a project, if the file name
   --  corresponds to a valid unit name.

   procedure Show_Source_Dirs (Project : Project_Id);
   --  List all the source directories of a project.

   procedure Locate_Directory
     (Name    : Name_Id;
      Parent  : Name_Id;
      Dir     : out Name_Id;
      Display : out Name_Id);
   --  Locate a directory.
   --  Returns No_Name if directory does not exist.

   function Path_Name_Of
     (File_Name : Name_Id;
      Directory : Name_Id) return String;
   --  Returns the path name of a (non project) file.
   --  Returns an empty string if file cannot be found.

   function Project_Extends
     (Extending : Project_Id;
      Extended  : Project_Id) return Boolean;
   --  Returns True if Extending is extending directly or indirectly Extended.

   procedure Check_Naming_Scheme
     (Data    : in out Project_Data;
      Project : Project_Id);
   --  Check the naming scheme part of Data

   type Unit_Info is record
      Kind : Spec_Or_Body;
      Unit : Name_Id;
   end record;
   No_Unit : constant Unit_Info := (Specification, No_Name);

   package Naming_Exceptions is new GNAT.HTable.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Unit_Info,
      No_Element => No_Unit,
      Key        => Name_Id,
      Hash       => Hash,
      Equal      => "=");

   function Hash (Unit : Unit_Info) return Header_Num;

   package Reverse_Naming_Exceptions is new GNAT.HTable.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Name_Id,
      No_Element => No_Name,
      Key        => Unit_Info,
      Hash       => Hash,
      Equal      => "=");
   --  A table to check if a unit with an exceptional name will hide
   --  a source with a file name following the naming convention.

   procedure Prepare_Naming_Exceptions
     (List : Array_Element_Id;
      Kind : Spec_Or_Body);
   --  Prepare the internal hash tables used for checking naming exceptions.
   --  Insert all elements of List in the tables.

   procedure Free_Naming_Exceptions;
   --  Free the internal hash tables used for checking naming exceptions

   function Compute_Directory_Last (Dir : String) return Natural;
   --  Return the index of the last significant character in Dir. This is used
   --  to avoid duplicates '/' at the end of directory names

   ----------------------------
   -- Compute_Directory_Last --
   ----------------------------

   function Compute_Directory_Last (Dir : String) return Natural is
   begin
      if Dir'Length > 1
        and then (Dir (Dir'Last - 1) = Directory_Separator
                  or else Dir (Dir'Last - 1) = '/')
      then
         return Dir'Last - 1;
      else
         return Dir'Last;
      end if;
   end Compute_Directory_Last;

   -------------------------------
   -- Prepare_Naming_Exceptions --
   -------------------------------

   procedure Prepare_Naming_Exceptions
     (List : Array_Element_Id;
      Kind : Spec_Or_Body)
   is
      Current : Array_Element_Id := List;
      Element : Array_Element;

   begin
      while Current /= No_Array_Element loop
         Element := Array_Elements.Table (Current);

         if Element.Index /= No_Name then
            Naming_Exceptions.Set
              (Element.Value.Value,
               (Kind => Kind, Unit => Element.Index));
            Reverse_Naming_Exceptions.Set
              ((Kind => Kind, Unit => Element.Index),
               Element.Value.Value);
         end if;

         Current := Element.Next;
      end loop;
   end Prepare_Naming_Exceptions;

   ----------
   -- Hash --
   ----------

   function Hash (Unit : Unit_Info) return Header_Num is
   begin
      return Header_Num (Unit.Unit mod 2048);
   end Hash;

   ----------------------------
   -- Free_Naming_Exceptions --
   ----------------------------

   procedure Free_Naming_Exceptions is
   begin
      Naming_Exceptions.Reset;
      Reverse_Naming_Exceptions.Reset;
   end Free_Naming_Exceptions;

   -------------------------
   -- Check_Naming_Scheme --
   -------------------------

   procedure Check_Naming_Scheme
     (Data    : in out Project_Data;
      Project : Project_Id)
   is
      Naming_Id : constant Package_Id :=
                    Util.Value_Of (Name_Naming, Data.Decl.Packages);

      Naming : Package_Element;

      procedure Check_Unit_Names (List : Array_Element_Id);
      --  Check that a list of unit names contains only valid names.

      ----------------------
      -- Check_Unit_Names --
      ----------------------

      procedure Check_Unit_Names (List : Array_Element_Id) is
         Current   : Array_Element_Id := List;
         Element   : Array_Element;
         Unit_Name : Name_Id;

      begin
         --  Loop through elements of the string list

         while Current /= No_Array_Element loop
            Element := Array_Elements.Table (Current);

            --  Put file name in canonical case

            Get_Name_String (Element.Value.Value);
            Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
            Element.Value.Value := Name_Find;

            --  Check that it contains a valid unit name

            Get_Name_String (Element.Index);
            Check_Ada_Name (Name_Buffer (1 .. Name_Len), Unit_Name);

            if Unit_Name = No_Name then
               Err_Vars.Error_Msg_Name_1 := Element.Index;
               Error_Msg
                 (Project,
                  "{ is not a valid unit name.",
                  Element.Value.Location);

            else
               if Current_Verbosity = High then
                  Write_Str ("    Unit (""");
                  Write_Str (Get_Name_String (Unit_Name));
                  Write_Line (""")");
               end if;

               Element.Index := Unit_Name;
               Array_Elements.Table (Current) := Element;
            end if;

            Current := Element.Next;
         end loop;
      end Check_Unit_Names;

   --  Start of processing for Check_Naming_Scheme

   begin
      --  If there is a package Naming, we will put in Data.Naming what is in
      --  this package Naming.

      if Naming_Id /= No_Package then
         Naming := Packages.Table (Naming_Id);

         if Current_Verbosity = High then
            Write_Line ("Checking ""Naming"" for Ada.");
         end if;

         declare
            Bodies : constant Array_Element_Id :=
                       Util.Value_Of (Name_Body, Naming.Decl.Arrays);

            Specs : constant Array_Element_Id :=
                      Util.Value_Of (Name_Spec, Naming.Decl.Arrays);

         begin
            if Bodies /= No_Array_Element then

               --  We have elements in the array Body_Part

               if Current_Verbosity = High then
                  Write_Line ("Found Bodies.");
               end if;

               Data.Naming.Bodies := Bodies;
               Check_Unit_Names (Bodies);

            else
               if Current_Verbosity = High then
                  Write_Line ("No Bodies.");
               end if;
            end if;

            if Specs /= No_Array_Element then

               --  We have elements in the array Specs

               if Current_Verbosity = High then
                  Write_Line ("Found Specs.");
               end if;

               Data.Naming.Specs := Specs;
               Check_Unit_Names (Specs);

            else
               if Current_Verbosity = High then
                  Write_Line ("No Specs.");
               end if;
            end if;
         end;

         --  We are now checking if variables Dot_Replacement, Casing,
         --  Spec_Suffix, Body_Suffix and/or Separate_Suffix
         --  exist.

         --  For each variable, if it does not exist, we do nothing,
         --  because we already have the default.

         --  Check Dot_Replacement

         declare
            Dot_Replacement : constant Variable_Value :=
                                Util.Value_Of
                                  (Name_Dot_Replacement,
                                   Naming.Decl.Attributes);

         begin
            pragma Assert (Dot_Replacement.Kind = Single,
                           "Dot_Replacement is not a single string");

            if not Dot_Replacement.Default then
               Get_Name_String (Dot_Replacement.Value);

               if Name_Len = 0 then
                  Error_Msg
                    (Project,
                     "Dot_Replacement cannot be empty",
                     Dot_Replacement.Location);

               else
                  Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
                  Data.Naming.Dot_Replacement := Name_Find;
                  Data.Naming.Dot_Repl_Loc := Dot_Replacement.Location;
               end if;
            end if;
         end;

         if Current_Verbosity = High then
            Write_Str  ("  Dot_Replacement = """);
            Write_Str  (Get_Name_String (Data.Naming.Dot_Replacement));
            Write_Char ('"');
            Write_Eol;
         end if;

         --  Check Casing

         declare
            Casing_String : constant Variable_Value :=
                              Util.Value_Of
                                (Name_Casing, Naming.Decl.Attributes);

         begin
            pragma Assert (Casing_String.Kind = Single,
                           "Casing is not a single string");

            if not Casing_String.Default then
               declare
                  Casing_Image : constant String :=
                                   Get_Name_String (Casing_String.Value);
               begin
                  declare
                     Casing : constant Casing_Type := Value (Casing_Image);
                  begin
                     Data.Naming.Casing := Casing;
                  end;

               exception
                  when Constraint_Error =>
                     if Casing_Image'Length = 0 then
                        Error_Msg
                          (Project,
                           "Casing cannot be an empty string",
                           Casing_String.Location);

                     else
                        Name_Len := Casing_Image'Length;
                        Name_Buffer (1 .. Name_Len) := Casing_Image;
                        Err_Vars.Error_Msg_Name_1 := Name_Find;
                        Error_Msg
                          (Project,
                           "{ is not a correct Casing",
                           Casing_String.Location);
                     end if;
               end;
            end if;
         end;

         if Current_Verbosity = High then
            Write_Str  ("  Casing = ");
            Write_Str  (Image (Data.Naming.Casing));
            Write_Char ('.');
            Write_Eol;
         end if;

         --  Check Spec_Suffix

         declare
            Ada_Spec_Suffix : constant Variable_Value :=
                                Prj.Util.Value_Of
                                 (Index => Name_Ada,
                                  In_Array => Data.Naming.Spec_Suffix);

         begin
            if Ada_Spec_Suffix.Kind = Single
              and then Get_Name_String (Ada_Spec_Suffix.Value) /= ""
            then
               Data.Naming.Current_Spec_Suffix := Ada_Spec_Suffix.Value;
               Data.Naming.Spec_Suffix_Loc := Ada_Spec_Suffix.Location;

            else
               Data.Naming.Current_Spec_Suffix := Default_Ada_Spec_Suffix;
            end if;
         end;

         if Current_Verbosity = High then
            Write_Str  ("  Spec_Suffix = """);
            Write_Str  (Get_Name_String (Data.Naming.Current_Spec_Suffix));
            Write_Char ('"');
            Write_Eol;
         end if;

         --  Check Body_Suffix

         declare
            Ada_Body_Suffix : constant Variable_Value :=
              Prj.Util.Value_Of
              (Index => Name_Ada,
               In_Array => Data.Naming.Body_Suffix);

         begin
            if Ada_Body_Suffix.Kind = Single
              and then Get_Name_String (Ada_Body_Suffix.Value) /= ""
            then
               Data.Naming.Current_Body_Suffix := Ada_Body_Suffix.Value;
               Data.Naming.Body_Suffix_Loc := Ada_Body_Suffix.Location;

            else
               Data.Naming.Current_Body_Suffix := Default_Ada_Body_Suffix;
            end if;
         end;

         if Current_Verbosity = High then
            Write_Str  ("  Body_Suffix = """);
            Write_Str  (Get_Name_String (Data.Naming.Current_Body_Suffix));
            Write_Char ('"');
            Write_Eol;
         end if;

         --  Check Separate_Suffix

         declare
            Ada_Sep_Suffix : constant Variable_Value :=
                               Prj.Util.Value_Of
                                 (Variable_Name => Name_Separate_Suffix,
                                  In_Variables  => Naming.Decl.Attributes);

         begin
            if Ada_Sep_Suffix.Default then
               Data.Naming.Separate_Suffix :=
                 Data.Naming.Current_Body_Suffix;

            else
               if Get_Name_String (Ada_Sep_Suffix.Value) = "" then
                  Error_Msg
                    (Project,
                     "Separate_Suffix cannot be empty",
                     Ada_Sep_Suffix.Location);

               else
                  Data.Naming.Separate_Suffix := Ada_Sep_Suffix.Value;
                  Data.Naming.Sep_Suffix_Loc  := Ada_Sep_Suffix.Location;
               end if;
            end if;
         end;

         if Current_Verbosity = High then
            Write_Str  ("  Separate_Suffix = """);
            Write_Str  (Get_Name_String (Data.Naming.Separate_Suffix));
            Write_Char ('"');
            Write_Eol;
         end if;

         --  Check if Data.Naming is valid

         Check_Ada_Naming_Scheme (Project, Data.Naming);

      else
         Data.Naming.Current_Spec_Suffix := Default_Ada_Spec_Suffix;
         Data.Naming.Current_Body_Suffix := Default_Ada_Body_Suffix;
         Data.Naming.Separate_Suffix     := Default_Ada_Body_Suffix;
      end if;
   end Check_Naming_Scheme;

   ---------------
   -- Ada_Check --
   ---------------

   procedure Ada_Check
     (Project      : Project_Id;
      Report_Error : Put_Line_Access;
      Trusted_Mode : Boolean)
   is
      Data         : Project_Data;
      Languages    : Variable_Value := Nil_Variable_Value;

      Extending    : Boolean := False;

      function Check_Project (P : Project_Id) return Boolean;
      --  Returns True if P is Project or a project extended by Project

      procedure Find_Sources;
      --  Find all the sources in all of the source directories
      --  of a project.

      procedure Get_Path_Names_And_Record_Sources;
      --  Find the path names of the source files in the Source_Names table
      --  in the source directories and record those that are Ada sources.

      procedure Get_Sources_From_File
        (Path     : String;
         Location : Source_Ptr);
      --  Get the sources of a project from a text file

      procedure Warn_If_Not_Sources
        (Conventions : Array_Element_Id;
         Specs       : Boolean);
      --  Check that individual naming conventions apply to immediate
      --  sources of the project; if not, issue a warning.

      -------------------
      -- Check_Project --
      -------------------

      function Check_Project (P : Project_Id) return Boolean is
      begin
         if P = Project then
            return True;
         elsif Extending then
            declare
               Data : Project_Data := Projects.Table (Project);

            begin
               while Data.Extends /= No_Project loop
                  if P = Data.Extends then
                     return True;
                  end if;

                  Data := Projects.Table (Data.Extends);
               end loop;
            end;
         end if;

         return False;
      end Check_Project;

      ------------------
      -- Find_Sources --
      ------------------

      procedure Find_Sources is
         Source_Dir      : String_List_Id := Data.Source_Dirs;
         Element         : String_Element;
         Dir             : Dir_Type;
         Current_Source  : String_List_Id := Nil_String;
         Source_Recorded : Boolean := False;

      begin
         if Current_Verbosity = High then
            Write_Line ("Looking for sources:");
         end if;

         --  For each subdirectory

         while Source_Dir /= Nil_String loop
            begin
               Source_Recorded := False;
               Element := String_Elements.Table (Source_Dir);
               if Element.Value /= No_Name then
                  Get_Name_String (Element.Display_Value);
                  declare
                     Source_Directory : constant String :=
                        Name_Buffer (1 .. Name_Len) & Directory_Separator;
                     Dir_Last  : constant Natural :=
                        Compute_Directory_Last (Source_Directory);

                  begin
                     if Current_Verbosity = High then
                        Write_Str ("Source_Dir = ");
                        Write_Line (Source_Directory);
                     end if;

                     --  We look to every entry in the source directory

                     Open (Dir, Source_Directory
                             (Source_Directory'First .. Dir_Last));

                     --  Canonical_Case_File_Name (Source_Directory);

                     loop
                        Read (Dir, Name_Buffer, Name_Len);

                        if Current_Verbosity = High then
                           Write_Str  ("   Checking ");
                           Write_Line (Name_Buffer (1 .. Name_Len));
                        end if;

                        exit when Name_Len = 0;

                        declare
                           File_Name : constant Name_Id := Name_Find;
                           Path      : constant String :=
                                  Normalize_Pathname
                                    (Name      => Name_Buffer (1 .. Name_Len),
                                     Directory => Source_Directory
                                       (Source_Directory'First .. Dir_Last),
                                     Resolve_Links => False,
                                     Case_Sensitive => True);
                           Path_Name : Name_Id;

                        begin
                           if Trusted_Mode or else Is_Regular_File (Path) then
                              Name_Len := Path'Length;
                              Name_Buffer (1 .. Name_Len) := Path;
                              Path_Name := Name_Find;

                              --  We attempt to register it as a source.
                              --  However, there is no error if the file
                              --  does not contain a valid source.
                              --  But there is an error if we have a
                              --  duplicate unit name.

                              Record_Source
                                (File_Name       => File_Name,
                                 Path_Name       => Path_Name,
                                 Project         => Project,
                                 Data            => Data,
                                 Location        => No_Location,
                                 Current_Source  => Current_Source,
                                 Source_Recorded => Source_Recorded,
                                 Trusted_Mode    => Trusted_Mode);
                           end if;
                        end;
                     end loop;

                     Close (Dir);
                  end;
               end if;

            exception
               when Directory_Error =>
                  null;
            end;

            if Source_Recorded then
               String_Elements.Table (Source_Dir).Flag := True;
            end if;

            Source_Dir := Element.Next;
         end loop;

         if Current_Verbosity = High then
            Write_Line ("end Looking for sources.");
         end if;

         --  If we have looked for sources and found none, then
         --  it is an error, except if it is an extending project.
         --  If a non extending project is not supposed to contain
         --  any source, then we never call Find_Sources.

         if Current_Source /= Nil_String then
            Data.Sources_Present := True;

         elsif Data.Extends = No_Project then
            Error_Msg
              (Project,
               "there are no Ada sources in this project",
               Data.Location);
         end if;
      end Find_Sources;

      ---------------------------------------
      -- Get_Path_Names_And_Record_Sources --
      ---------------------------------------

      procedure Get_Path_Names_And_Record_Sources is
         Source_Dir : String_List_Id := Data.Source_Dirs;
         Element    : String_Element;
         Path       : Name_Id;

         Dir      : Dir_Type;
         Name     : Name_Id;
         Canonical_Name : Name_Id;
         Name_Str : String (1 .. 1_024);
         Last     : Natural := 0;
         NL       : Name_Location;

         Current_Source : String_List_Id := Nil_String;

         First_Error : Boolean := True;

         Source_Recorded : Boolean := False;

      begin
         --  We look in all source directories for this file name

         while Source_Dir /= Nil_String loop
            Source_Recorded := False;
            Element := String_Elements.Table (Source_Dir);

            declare
               Dir_Path : constant String := Get_Name_String (Element.Value);
            begin
               if Current_Verbosity = High then
                  Write_Str ("checking directory """);
                  Write_Str (Dir_Path);
                  Write_Line ("""");
               end if;

               Open (Dir, Dir_Path);

               loop
                  Read (Dir, Name_Str, Last);
                  exit when Last = 0;
                  Name_Len := Last;
                  Name_Buffer (1 .. Name_Len) := Name_Str (1 .. Last);
                  Name := Name_Find;
                  Canonical_Case_File_Name (Name_Str (1 .. Last));
                  Name_Len := Last;
                  Name_Buffer (1 .. Name_Len) := Name_Str (1 .. Last);
                  Canonical_Name := Name_Find;
                  NL := Source_Names.Get (Canonical_Name);

                  if NL /= No_Name_Location and then not NL.Found then
                     NL.Found := True;
                     Source_Names.Set (Canonical_Name, NL);
                     Name_Len := Dir_Path'Length;
                     Name_Buffer (1 .. Name_Len) := Dir_Path;
                     Add_Char_To_Name_Buffer (Directory_Separator);
                     Add_Str_To_Name_Buffer (Name_Str (1 .. Last));
                     Path := Name_Find;

                     if Current_Verbosity = High then
                        Write_Str  ("  found ");
                        Write_Line (Get_Name_String (Name));
                     end if;

                     --  Register the source if it is an Ada compilation unit..

                     Record_Source
                       (File_Name       => Name,
                        Path_Name       => Path,
                        Project         => Project,
                        Data            => Data,
                        Location        => NL.Location,
                        Current_Source  => Current_Source,
                        Source_Recorded => Source_Recorded,
                        Trusted_Mode    => Trusted_Mode);
                  end if;
               end loop;

               Close (Dir);
            end;

            if Source_Recorded then
               String_Elements.Table (Source_Dir).Flag := True;
            end if;

            Source_Dir := Element.Next;
         end loop;

         --  It is an error if a source file name in a source list or
         --  in a source list file is not found.

         NL := Source_Names.Get_First;

         while NL /= No_Name_Location loop
            if not NL.Found then
               Err_Vars.Error_Msg_Name_1 := NL.Name;

               if First_Error then
                  Error_Msg
                    (Project,
                     "source file { cannot be found",
                     NL.Location);
                  First_Error := False;

               else
                  Error_Msg
                    (Project,
                     "\source file { cannot be found",
                     NL.Location);
               end if;
            end if;

            NL := Source_Names.Get_Next;
         end loop;
      end Get_Path_Names_And_Record_Sources;

      ---------------------------
      -- Get_Sources_From_File --
      ---------------------------

      procedure Get_Sources_From_File
        (Path     : String;
         Location : Source_Ptr)
      is
         File           : Prj.Util.Text_File;
         Line           : String (1 .. 250);
         Last           : Natural;
         Source_Name    : Name_Id;

      begin
         if Current_Verbosity = High then
            Write_Str  ("Opening """);
            Write_Str  (Path);
            Write_Line (""".");
         end if;

         --  We open the file

         Prj.Util.Open (File, Path);

         if not Prj.Util.Is_Valid (File) then
            Error_Msg (Project, "file does not exist", Location);
         else
            Source_Names.Reset;

            while not Prj.Util.End_Of_File (File) loop
               Prj.Util.Get_Line (File, Line, Last);

               --  If the line is not empty and does not start with "--",
               --  then it should contain a file name. However, if the
               --  file name does not exist, it may be for another language
               --  and we don't fail.

               if Last /= 0
                 and then (Last = 1 or else Line (1 .. 2) /= "--")
               then
                  Name_Len := Last;
                  Name_Buffer (1 .. Name_Len) := Line (1 .. Last);
                  Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
                  Source_Name := Name_Find;
                  Source_Names.Set
                    (K => Source_Name,
                     E =>
                       (Name     => Source_Name,
                        Location => Location,
                        Found    => False));
               end if;
            end loop;

            Prj.Util.Close (File);

         end if;

         Get_Path_Names_And_Record_Sources;

         --  We should have found at least one source.
         --  If not, report an error.

         if Data.Sources = Nil_String then
            Error_Msg (Project,
                       "there are no Ada sources in this project",
                       Location);
         end if;
      end Get_Sources_From_File;

      -------------------------
      -- Warn_If_Not_Sources --
      -------------------------

      procedure Warn_If_Not_Sources
        (Conventions : Array_Element_Id;
         Specs       : Boolean)
      is
         Conv          : Array_Element_Id := Conventions;
         Unit          : Name_Id;
         The_Unit_Id   : Unit_Id;
         The_Unit_Data : Unit_Data;
         Location      : Source_Ptr;

      begin
         while Conv /= No_Array_Element loop
            Unit := Array_Elements.Table (Conv).Index;
            Error_Msg_Name_1 := Unit;
            Get_Name_String (Unit);
            To_Lower (Name_Buffer (1 .. Name_Len));
            Unit := Name_Find;
            The_Unit_Id := Units_Htable.Get (Unit);
            Location := Array_Elements.Table (Conv).Value.Location;

            if The_Unit_Id = Prj.Com.No_Unit then
               Error_Msg
                 (Project,
                  "?unknown unit {",
                  Location);

            else
               The_Unit_Data := Units.Table (The_Unit_Id);

               if Specs then
                  if not Check_Project
                    (The_Unit_Data.File_Names (Specification).Project)
                  then
                     Error_Msg
                       (Project,
                        "?unit{ has no spec in this project",
                        Location);
                  end if;

               else
                  if not Check_Project
                    (The_Unit_Data.File_Names (Com.Body_Part).Project)
                  then
                     Error_Msg
                       (Project,
                        "?unit{ has no body in this project",
                        Location);
                  end if;
               end if;
            end if;

            Conv := Array_Elements.Table (Conv).Next;
         end loop;
      end Warn_If_Not_Sources;

   --  Start of processing for Ada_Check

   begin
      Language_Independent_Check (Project, Report_Error);

      Error_Report    := Report_Error;

      Data      := Projects.Table (Project);
      Extending := Data.Extends /= No_Project;
      Languages := Prj.Util.Value_Of (Name_Languages, Data.Decl.Attributes);

      Data.Naming.Current_Language := Name_Ada;
      Data.Sources_Present         := Data.Source_Dirs /= Nil_String;

      if not Languages.Default then
         declare
            Current   : String_List_Id := Languages.Values;
            Element   : String_Element;
            Ada_Found : Boolean := False;

         begin
            Look_For_Ada : while Current /= Nil_String loop
               Element := String_Elements.Table (Current);
               Get_Name_String (Element.Value);
               To_Lower (Name_Buffer (1 .. Name_Len));

               if Name_Buffer (1 .. Name_Len) = "ada" then
                  Ada_Found := True;
                  exit Look_For_Ada;
               end if;

               Current := Element.Next;
            end loop Look_For_Ada;

            if not Ada_Found then

               --  Mark the project file as having no sources for Ada

               Data.Sources_Present := False;
            end if;
         end;
      end if;

      Check_Naming_Scheme (Data, Project);

      Prepare_Naming_Exceptions (Data.Naming.Bodies, Body_Part);
      Prepare_Naming_Exceptions (Data.Naming.Specs,  Specification);

      --  If we have source directories, then find the sources

      if Data.Sources_Present then
         if Data.Source_Dirs = Nil_String then
            Data.Sources_Present := False;

         else
            declare
               Sources : constant Variable_Value :=
                           Util.Value_Of
                             (Name_Source_Files,
                              Data.Decl.Attributes);

               Source_List_File : constant Variable_Value :=
                                    Util.Value_Of
                                      (Name_Source_List_File,
                                       Data.Decl.Attributes);

               Locally_Removed : constant Variable_Value :=
                           Util.Value_Of
                             (Name_Locally_Removed_Files,
                              Data.Decl.Attributes);

            begin
               pragma Assert
                 (Sources.Kind = List,
                    "Source_Files is not a list");

               pragma Assert
                 (Source_List_File.Kind = Single,
                    "Source_List_File is not a single string");

               if not Sources.Default then
                  if not Source_List_File.Default then
                     Error_Msg
                       (Project,
                        "?both variables source_files and " &
                        "source_list_file are present",
                        Source_List_File.Location);
                  end if;

                  --  Sources is a list of file names

                  declare
                     Current        : String_List_Id := Sources.Values;
                     Element        : String_Element;
                     Location       : Source_Ptr;
                     Name           : Name_Id;

                  begin
                     Source_Names.Reset;

                     Data.Sources_Present := Current /= Nil_String;

                     while Current /= Nil_String loop
                        Element := String_Elements.Table (Current);
                        Get_Name_String (Element.Value);
                        Canonical_Case_File_Name
                          (Name_Buffer (1 .. Name_Len));
                        Name := Name_Find;

                        --  If the element has no location, then use the
                        --  location of Sources to report possible errors.

                        if Element.Location = No_Location then
                           Location := Sources.Location;

                        else
                           Location := Element.Location;
                        end if;

                        Source_Names.Set
                          (K => Name,
                           E =>
                             (Name     => Name,
                              Location => Location,
                              Found    => False));

                        Current := Element.Next;
                     end loop;

                     Get_Path_Names_And_Record_Sources;
                  end;

                  --  No source_files specified.
                  --  We check Source_List_File has been specified.

               elsif not Source_List_File.Default then

                  --  Source_List_File is the name of the file
                  --  that contains the source file names

                  declare
                     Source_File_Path_Name : constant String :=
                       Path_Name_Of
                       (Source_List_File.Value,
                        Data.Directory);

                  begin
                     if Source_File_Path_Name'Length = 0 then
                        Err_Vars.Error_Msg_Name_1 := Source_List_File.Value;
                        Error_Msg
                          (Project,
                           "file with sources { does not exist",
                           Source_List_File.Location);

                     else
                        Get_Sources_From_File
                          (Source_File_Path_Name,
                           Source_List_File.Location);
                     end if;
                  end;

               else
                  --  Neither Source_Files nor Source_List_File has been
                  --  specified.
                  --  Find all the files that satisfy
                  --  the naming scheme in all the source directories.

                  Find_Sources;
               end if;

               --  If there are sources that are locally removed, mark them as
               --  such in the Units table.

               if not Locally_Removed.Default then
                  --  Sources can be locally removed only in extending
                  --  project files.

                  if Data.Extends = No_Project then
                     Error_Msg
                       (Project,
                        "Locally_Removed_Files can only be used " &
                        "in an extending project file",
                        Locally_Removed.Location);

                  else
                     declare
                        Current        : String_List_Id :=
                                           Locally_Removed.Values;
                        Element        : String_Element;
                        Location       : Source_Ptr;
                        OK             : Boolean;
                        Unit           : Unit_Data;
                        Name           : Name_Id;
                        Extended       : Project_Id;

                     begin
                        while Current /= Nil_String loop
                           Element := String_Elements.Table (Current);
                           Get_Name_String (Element.Value);
                           Canonical_Case_File_Name
                             (Name_Buffer (1 .. Name_Len));
                           Name := Name_Find;

                           --  If the element has no location, then use the
                           --  location of Locally_Removed to report
                           --  possible errors.

                           if Element.Location = No_Location then
                              Location := Locally_Removed.Location;

                           else
                              Location := Element.Location;
                           end if;

                           OK := False;

                           for Index in 1 .. Units.Last loop
                              Unit := Units.Table (Index);

                              if
                                Unit.File_Names (Specification).Name = Name
                              then
                                 OK := True;

                                 --  Check that this is from a project that
                                 --  the current project extends, but not the
                                 --  current project.

                                 Extended := Unit.File_Names
                                                    (Specification).Project;

                                 if Extended = Project then
                                    Error_Msg
                                      (Project,
                                       "cannot remove a source " &
                                       "of the same project",
                                       Location);

                                 elsif
                                   Project_Extends (Project, Extended)
                                 then
                                    Unit.File_Names
                                      (Specification).Path := Slash;
                                    Unit.File_Names
                                      (Specification).Needs_Pragma := False;
                                    Units.Table (Index) := Unit;
                                    Add_Forbidden_File_Name
                                      (Unit.File_Names (Specification).Name);
                                    exit;

                                 else
                                    Error_Msg
                                      (Project,
                                       "cannot remove a source from " &
                                       "another project",
                                       Location);
                                 end if;

                              elsif
                                Unit.File_Names (Body_Part).Name = Name
                              then
                                 OK := True;

                                 --  Check that this is from a project that
                                 --  the current project extends, but not the
                                 --  current project.

                                 Extended := Unit.File_Names
                                                    (Body_Part).Project;

                                 if Extended = Project then
                                    Error_Msg
                                      (Project,
                                       "cannot remove a source " &
                                       "of the same project",
                                       Location);

                                 elsif
                                   Project_Extends (Project, Extended)
                                 then
                                    Unit.File_Names (Body_Part).Path := Slash;
                                    Unit.File_Names (Body_Part).Needs_Pragma
                                      := False;
                                    Units.Table (Index) := Unit;
                                    Add_Forbidden_File_Name
                                      (Unit.File_Names (Body_Part).Name);
                                    exit;
                                 end if;

                              end if;
                           end loop;

                           if not OK then
                              Err_Vars.Error_Msg_Name_1 := Name;
                              Error_Msg (Project, "unknown file {", Location);
                           end if;

                           Current := Element.Next;
                        end loop;
                     end;
                  end if;
               end if;
            end;
         end if;
      end if;

      if Data.Sources_Present then

         --  Check that all individual naming conventions apply to
         --  sources of this project file.

         Warn_If_Not_Sources (Data.Naming.Bodies, Specs => False);
         Warn_If_Not_Sources (Data.Naming.Specs,  Specs => True);
      end if;

      --  If it is a library project file, check if it is a standalone library

      if Data.Library then
         Standalone_Library : declare
            Lib_Interfaces : constant Prj.Variable_Value :=
                               Prj.Util.Value_Of
                                 (Snames.Name_Library_Interface,
                                  Data.Decl.Attributes);
            Lib_Auto_Init  : constant Prj.Variable_Value :=
                               Prj.Util.Value_Of
                                 (Snames.Name_Library_Auto_Init,
                                  Data.Decl.Attributes);

            Lib_Src_Dir : constant Prj.Variable_Value :=
                            Prj.Util.Value_Of
                              (Snames.Name_Library_Src_Dir,
                               Data.Decl.Attributes);

            Lib_Symbol_File : constant Prj.Variable_Value :=
                                Prj.Util.Value_Of
                                  (Snames.Name_Library_Symbol_File,
                                   Data.Decl.Attributes);

            Lib_Symbol_Policy : constant Prj.Variable_Value :=
                                  Prj.Util.Value_Of
                                    (Snames.Name_Library_Symbol_Policy,
                                     Data.Decl.Attributes);

            Lib_Ref_Symbol_File : constant Prj.Variable_Value :=
                                  Prj.Util.Value_Of
                                    (Snames.Name_Library_Reference_Symbol_File,
                                     Data.Decl.Attributes);

            Auto_Init_Supported : constant Boolean :=
                                    MLib.Tgt.
                                     Standalone_Library_Auto_Init_Is_Supported;

            OK : Boolean := True;

         begin
            pragma Assert (Lib_Interfaces.Kind = List);

            --  It is a stand-alone library project file if attribute
            --  Library_Interface is defined.

            if not Lib_Interfaces.Default then
               declare
                  Interfaces : String_List_Id := Lib_Interfaces.Values;
                  Interface_ALIs : String_List_Id := Nil_String;
                  Unit : Name_Id;
                  The_Unit_Id : Unit_Id;
                  The_Unit_Data : Unit_Data;

                  procedure Add_ALI_For (Source : Name_Id);
                  --  Add an ALI file name to the list of Interface ALIs

                  -----------------
                  -- Add_ALI_For --
                  -----------------

                  procedure Add_ALI_For (Source : Name_Id) is
                  begin
                     Get_Name_String (Source);

                     declare
                        ALI : constant String :=
                                ALI_File_Name (Name_Buffer (1 .. Name_Len));
                        ALI_Name_Id : Name_Id;
                     begin
                        Name_Len := ALI'Length;
                        Name_Buffer (1 .. Name_Len) := ALI;
                        ALI_Name_Id := Name_Find;

                        String_Elements.Increment_Last;
                        String_Elements.Table (String_Elements.Last) :=
                          (Value    => ALI_Name_Id,
                           Display_Value => ALI_Name_Id,
                           Location => String_Elements.Table
                                                         (Interfaces).Location,
                           Flag     => False,
                           Next     => Interface_ALIs);
                        Interface_ALIs := String_Elements.Last;
                     end;
                  end Add_ALI_For;

               begin
                  Data.Standalone_Library := True;

                  --  Library_Interface cannot be an empty list

                  if Interfaces = Nil_String then
                     Error_Msg
                       (Project,
                        "Library_Interface cannot be an empty list",
                        Lib_Interfaces.Location);
                  end if;

                  --  Process each unit name specified in the attribute
                  --  Library_Interface.

                  while Interfaces /= Nil_String loop
                     Get_Name_String
                       (String_Elements.Table (Interfaces).Value);
                     To_Lower (Name_Buffer (1 .. Name_Len));

                     if Name_Len = 0 then
                        Error_Msg
                          (Project,
                           "an interface cannot be an empty string",
                           String_Elements.Table (Interfaces).Location);

                     else
                        Unit := Name_Find;
                        Error_Msg_Name_1 := Unit;
                        The_Unit_Id := Units_Htable.Get (Unit);

                        if The_Unit_Id = Prj.Com.No_Unit then
                           Error_Msg
                             (Project,
                              "unknown unit {",
                              String_Elements.Table (Interfaces).Location);

                        else
                           --  Check that the unit is part of the project

                           The_Unit_Data := Units.Table (The_Unit_Id);

                           if The_Unit_Data.File_Names
                                (Com.Body_Part).Name /= No_Name
                             and then The_Unit_Data.File_Names
                                        (Com.Body_Part).Path /= Slash
                           then
                              if Check_Project
                                 (The_Unit_Data.File_Names (Body_Part).Project)
                              then
                                 --  There is a body for this unit.
                                 --  If there is no spec, we need to check
                                 --  that it is not a subunit.

                                 if The_Unit_Data.File_Names
                                      (Specification).Name = No_Name
                                 then
                                    declare
                                       Src_Ind : Source_File_Index;

                                    begin
                                       Src_Ind := Sinput.P.Load_Project_File
                                                   (Get_Name_String
                                                      (The_Unit_Data.File_Names
                                                         (Body_Part).Path));

                                       if Sinput.P.Source_File_Is_Subunit
                                                     (Src_Ind)
                                       then
                                          Error_Msg
                                            (Project,
                                             "{ is a subunit; " &
                                             "it cannot be an interface",
                                             String_Elements.Table
                                               (Interfaces).Location);
                                       end if;
                                    end;
                                 end if;

                                 --  The unit is not a subunit, so we add
                                 --  to the Interface ALIs the ALI file
                                 --  corresponding to the body.

                                 Add_ALI_For
                                   (The_Unit_Data.File_Names (Body_Part).Name);

                              else
                                 Error_Msg
                                   (Project,
                                    "{ is not an unit of this project",
                                    String_Elements.Table
                                      (Interfaces).Location);
                              end if;

                           elsif The_Unit_Data.File_Names
                                   (Com.Specification).Name /= No_Name
                              and then The_Unit_Data.File_Names
                                         (Com.Specification).Path /= Slash
                              and then Check_Project
                                         (The_Unit_Data.File_Names
                                            (Specification).Project)

                           then
                              --  The unit is part of the project, it has
                              --  a spec, but no body. We add to the Interface
                              --  ALIs the ALI file corresponding to the spec.

                              Add_ALI_For
                               (The_Unit_Data.File_Names (Specification).Name);

                           else
                              Error_Msg
                                (Project,
                                 "{ is not an unit of this project",
                                 String_Elements.Table (Interfaces).Location);
                           end if;
                        end if;

                     end if;

                     Interfaces := String_Elements.Table (Interfaces).Next;
                  end loop;

                  --  Put the list of Interface ALIs in the project data

                  Data.Lib_Interface_ALIs := Interface_ALIs;

                  --  Check value of attribute Library_Auto_Init and set
                  --  Lib_Auto_Init accordingly.

                  if Lib_Auto_Init.Default then
                     --  If no attribute Library_Auto_Init is declared, then
                     --  set auto init only if it is supported.

                     Data.Lib_Auto_Init := Auto_Init_Supported;

                  else
                     Get_Name_String (Lib_Auto_Init.Value);
                     To_Lower (Name_Buffer (1 .. Name_Len));

                     if Name_Buffer (1 .. Name_Len) = "false" then
                        Data.Lib_Auto_Init := False;

                     elsif Name_Buffer (1 .. Name_Len) = "true" then
                        if Auto_Init_Supported then
                           Data.Lib_Auto_Init := True;

                        else
                           --  Library_Auto_Init cannot be "true" if auto init
                           --  is not supported

                           Error_Msg
                             (Project,
                              "library auto init not supported " &
                              "on this platform",
                              Lib_Auto_Init.Location);
                        end if;

                     else
                        Error_Msg
                          (Project,
                           "invalid value for attribute Library_Auto_Init",
                           Lib_Auto_Init.Location);
                     end if;
                  end if;
               end;

               --  If attribute Library_Src_Dir is defined and not the
               --  empty string, check if the directory exist and is not
               --  the object directory or one of the source directories.
               --  This is the directory where copies of the interface
               --  sources will be copied. Note that this directory may be
               --  the library directory.

               if Lib_Src_Dir.Value /= Empty_String then
                  declare
                     Dir_Id : constant Name_Id := Lib_Src_Dir.Value;

                  begin
                     Locate_Directory
                       (Dir_Id, Data.Display_Directory,
                        Data.Library_Src_Dir,
                        Data.Display_Library_Src_Dir);

                     --  If directory does not exist, report an error

                     if Data.Library_Src_Dir = No_Name then

                        --  Get the absolute name of the library directory
                        --  that does not exist, to report an error.

                        declare
                           Dir_Name : constant String :=
                                        Get_Name_String (Dir_Id);

                        begin
                           if Is_Absolute_Path (Dir_Name) then
                              Err_Vars.Error_Msg_Name_1 := Dir_Id;

                           else
                              Get_Name_String (Data.Directory);

                              if Name_Buffer (Name_Len) /=
                                Directory_Separator
                              then
                                 Name_Len := Name_Len + 1;
                                 Name_Buffer (Name_Len) :=
                                   Directory_Separator;
                              end if;

                              Name_Buffer
                                (Name_Len + 1 ..
                                   Name_Len + Dir_Name'Length) :=
                                  Dir_Name;
                              Name_Len := Name_Len + Dir_Name'Length;
                              Err_Vars.Error_Msg_Name_1 := Name_Find;
                           end if;

                           --  Report the error

                           Error_Msg
                             (Project,
                              "Directory { does not exist",
                              Lib_Src_Dir.Location);
                        end;

                     --  Report an error if it is the same as the object
                     --  directory.

                     elsif Data.Library_Src_Dir = Data.Object_Directory then
                        Error_Msg
                          (Project,
                           "directory to copy interfaces cannot be " &
                           "the object directory",
                           Lib_Src_Dir.Location);
                        Data.Library_Src_Dir := No_Name;

                     --  Check if it is the same as one of the source
                     --  directories.

                     else
                        declare
                           Src_Dirs : String_List_Id := Data.Source_Dirs;
                           Src_Dir  : String_Element;

                        begin
                           while Src_Dirs /= Nil_String loop
                              Src_Dir := String_Elements.Table (Src_Dirs);
                              Src_Dirs := Src_Dir.Next;

                              --  Report an error if it is one of the
                              --  source directories.

                              if Data.Library_Src_Dir = Src_Dir.Value then
                                 Error_Msg
                                   (Project,
                                    "directory to copy interfaces cannot " &
                                    "be one of the source directories",
                                    Lib_Src_Dir.Location);
                                 Data.Library_Src_Dir := No_Name;
                                 exit;
                              end if;
                           end loop;
                        end;

                        if Data.Library_Src_Dir /= No_Name
                          and then Current_Verbosity = High
                        then
                           Write_Str ("Directory to copy interfaces =""");
                           Write_Str (Get_Name_String (Data.Library_Dir));
                           Write_Line ("""");
                        end if;
                     end if;
                  end;
               end if;

               if not Lib_Symbol_File.Default then
                  Data.Symbol_Data.Symbol_File := Lib_Symbol_File.Value;

                  Get_Name_String (Lib_Symbol_File.Value);

                  if Name_Len = 0 then
                     Error_Msg
                       (Project,
                        "symbol file name cannot be an empty string",
                        Lib_Symbol_File.Location);

                  else
                     OK := not Is_Absolute_Path (Name_Buffer (1 .. Name_Len));

                     if OK then
                        for J in 1 .. Name_Len loop
                           if Name_Buffer (J) = '/'
                             or else Name_Buffer (J) = Directory_Separator
                           then
                              OK := False;
                              exit;
                           end if;
                        end loop;
                     end if;

                     if not OK then
                        Error_Msg_Name_1 := Lib_Symbol_File.Value;
                        Error_Msg
                          (Project,
                           "symbol file name { is illegal. " &
                           "Name canot include directory info.",
                           Lib_Symbol_File.Location);
                     end if;
                  end if;
               end if;

               if not Lib_Symbol_Policy.Default then
                  declare
                     Value : constant String :=
                               To_Lower
                                 (Get_Name_String (Lib_Symbol_Policy.Value));

                  begin
                     if Value = "autonomous" or else Value = "default" then
                        Data.Symbol_Data.Symbol_Policy := Autonomous;

                     elsif Value = "compliant" then
                        Data.Symbol_Data.Symbol_Policy := Compliant;

                     elsif Value = "controlled" then
                        Data.Symbol_Data.Symbol_Policy := Controlled;

                     else
                        Error_Msg
                          (Project,
                           "illegal value for Library_Symbol_Policy",
                           Lib_Symbol_Policy.Location);
                     end if;
                  end;
               end if;

               if Lib_Ref_Symbol_File.Default then
                  if Data.Symbol_Data.Symbol_Policy /= Autonomous then
                     Error_Msg
                       (Project,
                        "a reference symbol file need to be defined",
                        Lib_Symbol_Policy.Location);
                  end if;

               else
                  Data.Symbol_Data.Reference := Lib_Ref_Symbol_File.Value;

                  Get_Name_String (Lib_Symbol_File.Value);

                  if Name_Len = 0 then
                     Error_Msg
                       (Project,
                        "reference symbol file name cannot be an empty string",
                        Lib_Symbol_File.Location);

                  else
                     OK := not Is_Absolute_Path (Name_Buffer (1 .. Name_Len));

                     if OK then
                        for J in 1 .. Name_Len loop
                           if Name_Buffer (J) = '/'
                             or else Name_Buffer (J) = Directory_Separator
                           then
                              OK := False;
                              exit;
                           end if;
                        end loop;
                     end if;

                     if not OK then
                        Error_Msg_Name_1 := Lib_Ref_Symbol_File.Value;
                        Error_Msg
                          (Project,
                           "reference symbol file { name is illegal. " &
                           "Name canot include directory info.",
                           Lib_Ref_Symbol_File.Location);
                     end if;

                     if not Is_Regular_File
                       (Get_Name_String (Data.Object_Directory) &
                        Directory_Separator &
                        Get_Name_String (Lib_Ref_Symbol_File.Value))
                     then
                        Error_Msg_Name_1 := Lib_Ref_Symbol_File.Value;
                        Error_Msg
                          (Project,
                           "library reference symbol file { does not exist",
                           Lib_Ref_Symbol_File.Location);
                     end if;

                     if Data.Symbol_Data.Symbol_File /= No_Name then
                        declare
                           Symbol : String :=
                                      Get_Name_String
                                        (Data.Symbol_Data.Symbol_File);

                           Reference : String :=
                                         Get_Name_String
                                           (Data.Symbol_Data.Reference);

                        begin
                           Canonical_Case_File_Name (Symbol);
                           Canonical_Case_File_Name (Reference);

                           if Symbol = Reference then
                              Error_Msg
                                (Project,
                                 "reference symbol file and symbol file " &
                                 "cannot be the same file",
                                 Lib_Ref_Symbol_File.Location);
                           end if;
                        end;
                     end if;
                  end if;
               end if;
            end if;
         end Standalone_Library;
      end if;

      --  Put the list of Mains, if any, in the project data

      declare
         Mains : constant Variable_Value :=
                   Prj.Util.Value_Of (Name_Main, Data.Decl.Attributes);

      begin
         Data.Mains := Mains.Values;

         --  If no Mains were specified, and if we are an extending
         --  project, inherit the Mains from the project we are extending.

         if Mains.Default then
            if Data.Extends /= No_Project then
               Data.Mains := Projects.Table (Data.Extends).Mains;
            end if;

         --  In a library project file, Main cannot be specified

         elsif Data.Library then
            Error_Msg
              (Project,
               "a library project file cannot have Main specified",
               Mains.Location);
         end if;
      end;

      Projects.Table (Project) := Data;

      Free_Naming_Exceptions;
   end Ada_Check;

   -------------------
   -- ALI_File_Name --
   -------------------

   function ALI_File_Name (Source : String) return String is
   begin
      --  If the source name has an extension, then replace it with
      --  the ALI suffix.

      for Index in reverse Source'First + 1 .. Source'Last loop
         if Source (Index) = '.' then
            return Source (Source'First .. Index - 1) & ALI_Suffix;
         end if;
      end loop;

      --  If there is no dot, or if it is the first character, just add the
      --  ALI suffix.

      return Source & ALI_Suffix;
   end ALI_File_Name;

   --------------------
   -- Check_Ada_Name --
   --------------------

   procedure Check_Ada_Name
     (Name : String;
      Unit : out Name_Id)
   is
      The_Name        : String := Name;
      Real_Name       : Name_Id;
      Need_Letter     : Boolean := True;
      Last_Underscore : Boolean := False;
      OK              : Boolean := The_Name'Length > 0;

   begin
      To_Lower (The_Name);

      Name_Len := The_Name'Length;
      Name_Buffer (1 .. Name_Len) := The_Name;
      Real_Name := Name_Find;

      --  Check first that the given name is not an Ada reserved word

      if Get_Name_Table_Byte (Real_Name) /= 0
        and then Real_Name /= Name_Project
        and then Real_Name /= Name_Extends
        and then Real_Name /= Name_External
      then
         Unit := No_Name;

         if Current_Verbosity = High then
            Write_Str (The_Name);
            Write_Line (" is an Ada reserved word.");
         end if;

         return;
      end if;

      for Index in The_Name'Range loop
         if Need_Letter then

            --  We need a letter (at the beginning, and following a dot),
            --  but we don't have one.

            if Is_Letter (The_Name (Index)) then
               Need_Letter := False;

            else
               OK := False;

               if Current_Verbosity = High then
                  Write_Int  (Types.Int (Index));
                  Write_Str  (": '");
                  Write_Char (The_Name (Index));
                  Write_Line ("' is not a letter.");
               end if;

               exit;
            end if;

         elsif Last_Underscore
           and then (The_Name (Index) = '_' or else The_Name (Index) = '.')
         then
            --  Two underscores are illegal, and a dot cannot follow
            --  an underscore.

            OK := False;

            if Current_Verbosity = High then
               Write_Int  (Types.Int (Index));
               Write_Str  (": '");
               Write_Char (The_Name (Index));
               Write_Line ("' is illegal here.");
            end if;

            exit;

         elsif The_Name (Index) = '.' then

            --  We need a letter after a dot

            Need_Letter := True;

         elsif The_Name (Index) = '_' then
            Last_Underscore := True;

         else
            --  We need an letter or a digit

            Last_Underscore := False;

            if not Is_Alphanumeric (The_Name (Index)) then
               OK := False;

               if Current_Verbosity = High then
                  Write_Int  (Types.Int (Index));
                  Write_Str  (": '");
                  Write_Char (The_Name (Index));
                  Write_Line ("' is not alphanumeric.");
               end if;

               exit;
            end if;
         end if;
      end loop;

      --  Cannot end with an underscore or a dot

      OK := OK and then not Need_Letter and then not Last_Underscore;

      if OK then
         Unit := Real_Name;

      else
         --  Signal a problem with No_Name

         Unit := No_Name;
      end if;
   end Check_Ada_Name;

   -----------------------------
   -- Check_Ada_Naming_Scheme --
   -----------------------------

   procedure Check_Ada_Naming_Scheme
     (Project : Project_Id;
      Naming  : Naming_Data)
   is
   begin
      --  Only check if we are not using the standard naming scheme

      if Naming /= Standard_Naming_Data then
         declare
            Dot_Replacement       : constant String :=
                                     Get_Name_String
                                       (Naming.Dot_Replacement);

            Spec_Suffix : constant String :=
                                     Get_Name_String
                                       (Naming.Current_Spec_Suffix);

            Body_Suffix : constant String :=
                                     Get_Name_String
                                       (Naming.Current_Body_Suffix);

            Separate_Suffix       : constant String :=
                                     Get_Name_String
                                       (Naming.Separate_Suffix);

         begin
            --  Dot_Replacement cannot
            --   - be empty
            --   - start or end with an alphanumeric
            --   - be a single '_'
            --   - start with an '_' followed by an alphanumeric
            --   - contain a '.' except if it is "."

            if Dot_Replacement'Length = 0
              or else Is_Alphanumeric
                        (Dot_Replacement (Dot_Replacement'First))
              or else Is_Alphanumeric
                        (Dot_Replacement (Dot_Replacement'Last))
              or else (Dot_Replacement (Dot_Replacement'First) = '_'
                        and then
                        (Dot_Replacement'Length = 1
                          or else
                           Is_Alphanumeric
                             (Dot_Replacement (Dot_Replacement'First + 1))))
              or else (Dot_Replacement'Length > 1
                         and then
                           Index (Source => Dot_Replacement,
                                  Pattern => ".") /= 0)
            then
               Error_Msg
                 (Project,
                  '"' & Dot_Replacement &
                  """ is illegal for Dot_Replacement.",
                  Naming.Dot_Repl_Loc);
            end if;

            --  Suffixes cannot
            --   - be empty

            if Is_Illegal_Suffix
                 (Spec_Suffix, Dot_Replacement = ".")
            then
               Err_Vars.Error_Msg_Name_1 := Naming.Current_Spec_Suffix;
               Error_Msg
                 (Project,
                  "{ is illegal for Spec_Suffix",
                  Naming.Spec_Suffix_Loc);
            end if;

            if Is_Illegal_Suffix
                 (Body_Suffix, Dot_Replacement = ".")
            then
               Err_Vars.Error_Msg_Name_1 := Naming.Current_Body_Suffix;
               Error_Msg
                 (Project,
                  "{ is illegal for Body_Suffix",
                  Naming.Body_Suffix_Loc);
            end if;

            if Body_Suffix /= Separate_Suffix then
               if Is_Illegal_Suffix
                    (Separate_Suffix, Dot_Replacement = ".")
               then
                  Err_Vars.Error_Msg_Name_1 := Naming.Separate_Suffix;
                  Error_Msg
                    (Project,
                     "{ is illegal for Separate_Suffix",
                     Naming.Sep_Suffix_Loc);
               end if;
            end if;

            --  Spec_Suffix cannot have the same termination as
            --  Body_Suffix or Separate_Suffix

            if Spec_Suffix'Length <= Body_Suffix'Length
              and then
                Body_Suffix (Body_Suffix'Last -
                             Spec_Suffix'Length + 1 ..
                             Body_Suffix'Last) = Spec_Suffix
            then
               Error_Msg
                 (Project,
                  "Body_Suffix (""" &
                  Body_Suffix &
                  """) cannot end with" &
                  " Spec_Suffix  (""" &
                  Spec_Suffix & """).",
                  Naming.Body_Suffix_Loc);
            end if;

            if Body_Suffix /= Separate_Suffix
              and then Spec_Suffix'Length <= Separate_Suffix'Length
              and then
                Separate_Suffix
                  (Separate_Suffix'Last - Spec_Suffix'Length + 1
                    ..
                   Separate_Suffix'Last) = Spec_Suffix
            then
               Error_Msg
                 (Project,
                  "Separate_Suffix (""" &
                  Separate_Suffix &
                  """) cannot end with" &
                  " Spec_Suffix (""" &
                  Spec_Suffix & """).",
                  Naming.Sep_Suffix_Loc);
            end if;
         end;
      end if;
   end Check_Ada_Naming_Scheme;

   ---------------
   -- Error_Msg --
   ---------------

   procedure Error_Msg
     (Project       : Project_Id;
      Msg           : String;
      Flag_Location : Source_Ptr)
   is
      Error_Buffer : String (1 .. 5_000);
      Error_Last   : Natural := 0;
      Msg_Name     : Natural := 0;
      First        : Positive := Msg'First;

      procedure Add (C : Character);
      --  Add a character to the buffer

      procedure Add (S : String);
      --  Add a string to the buffer

      procedure Add (Id : Name_Id);
      --  Add a name to the buffer

      ---------
      -- Add --
      ---------

      procedure Add (C : Character) is
      begin
         Error_Last := Error_Last + 1;
         Error_Buffer (Error_Last) := C;
      end Add;

      procedure Add (S : String) is
      begin
         Error_Buffer (Error_Last + 1 .. Error_Last + S'Length) := S;
         Error_Last := Error_Last + S'Length;
      end Add;

      procedure Add (Id : Name_Id) is
      begin
         Get_Name_String (Id);
         Add (Name_Buffer (1 .. Name_Len));
      end Add;

   --  Start of processing for Error_Msg

   begin
      if Error_Report = null then
         Prj.Err.Error_Msg (Msg, Flag_Location);
         return;
      end if;

      if Msg (First) = '\' then

         --  Continuation character, ignore.

         First := First + 1;

      elsif Msg (First) = '?' then

         --  Warning character. It is always the first one in this package

         First := First + 1;
         Add ("Warning: ");
      end if;

      for Index in First .. Msg'Last loop
         if Msg (Index) = '{' or else Msg (Index) = '%' then

            --  Include a name between double quotes.

            Msg_Name := Msg_Name + 1;
            Add ('"');

            case Msg_Name is
               when 1 => Add (Err_Vars.Error_Msg_Name_1);
               when 2 => Add (Err_Vars.Error_Msg_Name_2);
               when 3 => Add (Err_Vars.Error_Msg_Name_3);

               when others => null;
            end case;

            Add ('"');

         else
            Add (Msg (Index));
         end if;

      end loop;

      Error_Report (Error_Buffer (1 .. Error_Last), Project);
   end Error_Msg;

   --------------
   -- Get_Unit --
   --------------

   procedure Get_Unit
     (Canonical_File_Name : Name_Id;
      Naming              : Naming_Data;
      Unit_Name           : out Name_Id;
      Unit_Kind           : out Spec_Or_Body;
      Needs_Pragma        : out Boolean)
   is
      function Check_Exception (Canonical : Name_Id) return Boolean;
      pragma Inline (Check_Exception);
      --  Check if Canonical is one of the exceptions in List.
      --  Returns True if Get_Unit should exit

      ---------------------
      -- Check_Exception --
      ---------------------

      function Check_Exception (Canonical : Name_Id) return Boolean is
         Info     : Unit_Info := Naming_Exceptions.Get (Canonical);
         VMS_Name : Name_Id;

      begin
         if Info = No_Unit then
            if Hostparm.OpenVMS then
               VMS_Name := Canonical;
               Get_Name_String (VMS_Name);

               if Name_Buffer (Name_Len) = '.' then
                  Name_Len := Name_Len - 1;
                  VMS_Name := Name_Find;
               end if;

               Info := Naming_Exceptions.Get (VMS_Name);
            end if;

            if Info = No_Unit then
               return False;
            end if;
         end if;

         Unit_Kind := Info.Kind;
         Unit_Name := Info.Unit;
         Needs_Pragma := True;
         return True;
      end Check_Exception;

   --  Start of processing for Get_Unit

   begin
      Needs_Pragma := False;

      if Check_Exception (Canonical_File_Name) then
         return;
      end if;

      Get_Name_String (Canonical_File_Name);

      declare
         File          : String := Name_Buffer (1 .. Name_Len);
         First         : constant Positive := File'First;
         Last          : Natural           := File'Last;
         Standard_GNAT : Boolean;

      begin
         Standard_GNAT :=
           Naming.Current_Spec_Suffix = Default_Ada_Spec_Suffix
             and then Naming.Current_Body_Suffix = Default_Ada_Body_Suffix;

         --  Check if the end of the file name is Specification_Append

         Get_Name_String (Naming.Current_Spec_Suffix);

         if File'Length > Name_Len
           and then File (Last - Name_Len + 1 .. Last) =
                                                Name_Buffer (1 .. Name_Len)
         then
            --  We have a spec

            Unit_Kind := Specification;
            Last := Last - Name_Len;

            if Current_Verbosity = High then
               Write_Str  ("   Specification: ");
               Write_Line (File (First .. Last));
            end if;

         else
            Get_Name_String (Naming.Current_Body_Suffix);

            --  Check if the end of the file name is Body_Append

            if File'Length > Name_Len
              and then File (Last - Name_Len + 1 .. Last) =
                                                Name_Buffer (1 .. Name_Len)
            then
               --  We have a body

               Unit_Kind := Body_Part;
               Last := Last - Name_Len;

               if Current_Verbosity = High then
                  Write_Str  ("   Body: ");
                  Write_Line (File (First .. Last));
               end if;

            elsif Naming.Separate_Suffix /= Naming.Current_Spec_Suffix then
               Get_Name_String (Naming.Separate_Suffix);

               --  Check if the end of the file name is Separate_Append

               if File'Length > Name_Len
                 and then File (Last - Name_Len + 1 .. Last) =
                                                Name_Buffer (1 .. Name_Len)
               then
                  --  We have a separate (a body)

                  Unit_Kind := Body_Part;
                  Last := Last - Name_Len;

                  if Current_Verbosity = High then
                     Write_Str  ("   Separate: ");
                     Write_Line (File (First .. Last));
                  end if;

               else
                  Last := 0;
               end if;

            else
               Last := 0;
            end if;
         end if;

         if Last = 0 then

            --  This is not a source file

            Unit_Name := No_Name;
            Unit_Kind := Specification;

            if Current_Verbosity = High then
               Write_Line ("   Not a valid file name.");
            end if;

            return;
         end if;

         Get_Name_String (Naming.Dot_Replacement);
         Standard_GNAT :=
           Standard_GNAT and then Name_Buffer (1 .. Name_Len) = "-";

         if Name_Buffer (1 .. Name_Len) /= "." then

            --  If Dot_Replacement is not a single dot,
            --  then there should not be any dot in the name.

            for Index in First .. Last loop
               if File (Index) = '.' then
                  if Current_Verbosity = High then
                     Write_Line
                       ("   Not a valid file name (some dot not replaced).");
                  end if;

                  Unit_Name := No_Name;
                  return;

               end if;
            end loop;

            --  Replace the substring Dot_Replacement with dots

            declare
               Index : Positive := First;

            begin
               while Index <= Last - Name_Len + 1 loop

                  if File (Index .. Index + Name_Len - 1) =
                    Name_Buffer (1 .. Name_Len)
                  then
                     File (Index) := '.';

                     if Name_Len > 1 and then Index < Last then
                        File (Index + 1 .. Last - Name_Len + 1) :=
                          File (Index + Name_Len .. Last);
                     end if;

                     Last := Last - Name_Len + 1;
                  end if;

                  Index := Index + 1;
               end loop;
            end;
         end if;

         --  Check if the casing is right

         declare
            Src : String := File (First .. Last);

         begin
            case Naming.Casing is
               when All_Lower_Case =>
                  Fixed.Translate
                    (Source  => Src,
                     Mapping => Lower_Case_Map);

               when All_Upper_Case =>
                  Fixed.Translate
                    (Source  => Src,
                     Mapping => Upper_Case_Map);

               when Mixed_Case | Unknown =>
                  null;
            end case;

            if Src /= File (First .. Last) then
               if Current_Verbosity = High then
                  Write_Line ("   Not a valid file name (casing).");
               end if;

               Unit_Name := No_Name;
               return;
            end if;

            --  We put the name in lower case

            Fixed.Translate
              (Source  => Src,
               Mapping => Lower_Case_Map);

            --  In the standard GNAT naming scheme, check for special cases:
            --  children or separates of A, G, I or S, and run time sources.

            if Standard_GNAT and then Src'Length >= 3 then
               declare
                  S1 : constant Character := Src (Src'First);
                  S2 : constant Character := Src (Src'First + 1);

               begin
                  if S1 = 'a' or else S1 = 'g'
                    or else S1 = 'i' or else S1 = 's'
                  then
                     --  Children or separates of packages A, G, I or S

                     if (Hostparm.OpenVMS and then S2 = '$')
                       or else (not Hostparm.OpenVMS and then S2 = '~')
                     then
                        Src (Src'First + 1) := '.';

                     --  If it is potentially a run time source, disable
                     --  filling of the mapping file to avoid warnings.

                     elsif S2 = '.' then
                        Set_Mapping_File_Initial_State_To_Empty;
                     end if;

                  end if;
               end;
            end if;

            if Current_Verbosity = High then
               Write_Str  ("      ");
               Write_Line (Src);
            end if;

            --  Now, we check if this name is a valid unit name

            Check_Ada_Name (Name => Src, Unit => Unit_Name);
         end;

      end;
   end Get_Unit;

   -----------------------
   -- Is_Illegal_Suffix --
   -----------------------

   function Is_Illegal_Suffix
     (Suffix                          : String;
      Dot_Replacement_Is_A_Single_Dot : Boolean) return Boolean
   is
   begin
      if Suffix'Length = 0 or else Index (Suffix, ".") = 0 then
         return True;
      end if;

      --  If dot replacement is a single dot, and first character of
      --  suffix is also a dot

      if Dot_Replacement_Is_A_Single_Dot
        and then Suffix (Suffix'First) = '.'
      then
         for Index in Suffix'First + 1 .. Suffix'Last loop

            --  If there is another dot

            if Suffix (Index) = '.' then

               --  It is illegal to have a letter following the initial dot

               return Is_Letter (Suffix (Suffix'First + 1));
            end if;
         end loop;
      end if;

      --  Everything is OK

      return False;
   end Is_Illegal_Suffix;

   --------------------------------
   -- Language_Independent_Check --
   --------------------------------

   procedure Language_Independent_Check
     (Project      : Project_Id;
      Report_Error : Put_Line_Access)
   is
      Last_Source_Dir : String_List_Id  := Nil_String;
      Data            : Project_Data    := Projects.Table (Project);

      procedure Find_Source_Dirs (From : Name_Id; Location : Source_Ptr);
      --  Find one or several source directories, and add them
      --  to the list of source directories of the project.

      ----------------------
      -- Find_Source_Dirs --
      ----------------------

      procedure Find_Source_Dirs (From : Name_Id; Location : Source_Ptr) is
         Directory : constant String := Get_Name_String (From);
         Element   : String_Element;

         procedure Recursive_Find_Dirs (Path : Name_Id);
         --  Find all the subdirectories (recursively) of Path and add them
         --  to the list of source directories of the project.

         -------------------------
         -- Recursive_Find_Dirs --
         -------------------------

         procedure Recursive_Find_Dirs (Path : Name_Id) is
            Dir      : Dir_Type;
            Name     : String (1 .. 250);
            Last     : Natural;
            List     : String_List_Id := Data.Source_Dirs;
            Element  : String_Element;
            Found    : Boolean := False;

            Non_Canonical_Path : Name_Id := No_Name;
            Canonical_Path     : Name_Id := No_Name;

            The_Path : constant String :=
                         Normalize_Pathname (Get_Name_String (Path)) &
                         Directory_Separator;

            The_Path_Last : constant Natural :=
                              Compute_Directory_Last (The_Path);

         begin
            Name_Len := The_Path_Last - The_Path'First + 1;
            Name_Buffer (1 .. Name_Len) :=
              The_Path (The_Path'First .. The_Path_Last);
            Non_Canonical_Path := Name_Find;
            Get_Name_String (Non_Canonical_Path);
            Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
            Canonical_Path := Name_Find;

            --  To avoid processing the same directory several times, check
            --  if the directory is already in Recursive_Dirs. If it is,
            --  then there is nothing to do, just return. If it is not, put
            --  it there and continue recursive processing.

            if Recursive_Dirs.Get (Canonical_Path) then
               return;

            else
               Recursive_Dirs.Set (Canonical_Path, True);
            end if;

            --  Check if directory is already in list

            while List /= Nil_String loop
               Element := String_Elements.Table (List);

               if Element.Value /= No_Name then
                  Found := Element.Value = Canonical_Path;
                  exit when Found;
               end if;

               List := Element.Next;
            end loop;

            --  If directory is not already in list, put it there

            if not Found then
               if Current_Verbosity = High then
                  Write_Str  ("   ");
                  Write_Line (The_Path (The_Path'First .. The_Path_Last));
               end if;

               String_Elements.Increment_Last;
               Element :=
                 (Value    => Canonical_Path,
                  Display_Value => Non_Canonical_Path,
                  Location => No_Location,
                  Flag     => False,
                  Next     => Nil_String);

               --  Case of first source directory

               if Last_Source_Dir = Nil_String then
                  Data.Source_Dirs := String_Elements.Last;

                  --  Here we already have source directories.

               else
                  --  Link the previous last to the new one

                  String_Elements.Table (Last_Source_Dir).Next :=
                    String_Elements.Last;
               end if;

               --  And register this source directory as the new last

               Last_Source_Dir  := String_Elements.Last;
               String_Elements.Table (Last_Source_Dir) := Element;
            end if;

            --  Now look for subdirectories. We do that even when this
            --  directory is already in the list, because some of its
            --  subdirectories may not be in the list yet.

            Open (Dir, The_Path (The_Path'First .. The_Path_Last));

            loop
               Read (Dir, Name, Last);
               exit when Last = 0;

               if Name (1 .. Last) /= "."
                 and then Name (1 .. Last) /= ".."
               then
                  --  Avoid . and ..

                  if Current_Verbosity = High then
                     Write_Str  ("   Checking ");
                     Write_Line (Name (1 .. Last));
                  end if;

                  declare
                     Path_Name : constant String :=
                                   Normalize_Pathname
                                     (Name      => Name (1 .. Last),
                                      Directory =>
                                        The_Path
                                          (The_Path'First .. The_Path_Last),
                                      Resolve_Links  => False,
                                      Case_Sensitive => True);

                  begin
                     if Is_Directory (Path_Name) then

                        --  We have found a new subdirectory, call self

                        Name_Len := Path_Name'Length;
                        Name_Buffer (1 .. Name_Len) := Path_Name;
                        Recursive_Find_Dirs (Name_Find);
                     end if;
                  end;
               end if;
            end loop;

            Close (Dir);

         exception
            when Directory_Error =>
               null;
         end Recursive_Find_Dirs;

      --  Start of processing for Find_Source_Dirs

      begin
         if Current_Verbosity = High then
            Write_Str ("Find_Source_Dirs (""");
            Write_Str (Directory);
            Write_Line (""")");
         end if;

         --  First, check if we are looking for a directory tree,
         --  indicated by "/**" at the end.

         if Directory'Length >= 3
           and then Directory (Directory'Last - 1 .. Directory'Last) = "**"
           and then (Directory (Directory'Last - 2) = '/'
                       or else
                     Directory (Directory'Last - 2) = Directory_Separator)
         then
            Data.Known_Order_Of_Source_Dirs := False;

            Name_Len := Directory'Length - 3;

            if Name_Len = 0 then

               --  This is the case of "/**": all directories
               --  in the file system.

               Name_Len := 1;
               Name_Buffer (1) := Directory (Directory'First);

            else
               Name_Buffer (1 .. Name_Len) :=
                 Directory (Directory'First .. Directory'Last - 3);
            end if;

            if Current_Verbosity = High then
               Write_Str ("Looking for all subdirectories of """);
               Write_Str (Name_Buffer (1 .. Name_Len));
               Write_Line ("""");
            end if;

            declare
               Base_Dir : constant Name_Id := Name_Find;
               Root_Dir : constant String :=
                            Normalize_Pathname
                              (Name      => Get_Name_String (Base_Dir),
                               Directory =>
                                 Get_Name_String (Data.Display_Directory),
                               Resolve_Links  => False,
                               Case_Sensitive => True);

            begin
               if Root_Dir'Length = 0 then
                  Err_Vars.Error_Msg_Name_1 := Base_Dir;

                  if Location = No_Location then
                     Error_Msg
                       (Project,
                        "{ is not a valid directory.",
                        Data.Location);
                  else
                     Error_Msg
                       (Project,
                        "{ is not a valid directory.",
                        Location);
                  end if;

               else
                  --  We have an existing directory,
                  --  we register it and all of its subdirectories.

                  if Current_Verbosity = High then
                     Write_Line ("Looking for source directories:");
                  end if;

                  Name_Len := Root_Dir'Length;
                  Name_Buffer (1 .. Name_Len) := Root_Dir;
                  Recursive_Find_Dirs (Name_Find);

                  if Current_Verbosity = High then
                     Write_Line ("End of looking for source directories.");
                  end if;
               end if;
            end;

         --  We have a single directory

         else
            declare
               Path_Name : Name_Id;
               Display_Path_Name : Name_Id;
            begin
               Locate_Directory
                 (From, Data.Display_Directory, Path_Name, Display_Path_Name);
               if Path_Name = No_Name then
                  Err_Vars.Error_Msg_Name_1 := From;

                  if Location = No_Location then
                     Error_Msg
                       (Project,
                        "{ is not a valid directory",
                        Data.Location);
                  else
                     Error_Msg
                       (Project,
                        "{ is not a valid directory",
                        Location);
                  end if;
               else

                  --  As it is an existing directory, we add it to
                  --  the list of directories.

                  String_Elements.Increment_Last;
                  Element.Value := Path_Name;
                  Element.Display_Value := Display_Path_Name;

                  if Last_Source_Dir = Nil_String then

                     --  This is the first source directory

                     Data.Source_Dirs := String_Elements.Last;

                  else
                     --  We already have source directories,
                     --  link the previous last to the new one.

                     String_Elements.Table (Last_Source_Dir).Next :=
                       String_Elements.Last;
                  end if;

                  --  And register this source directory as the new last

                  Last_Source_Dir := String_Elements.Last;
                  String_Elements.Table (Last_Source_Dir) := Element;
               end if;
            end;
         end if;
      end Find_Source_Dirs;

   --  Start of processing for Language_Independent_Check

   begin
      if Data.Language_Independent_Checked then
         return;
      end if;

      Data.Language_Independent_Checked := True;

      Error_Report := Report_Error;

      Recursive_Dirs.Reset;

      if Current_Verbosity = High then
         Write_Line ("Starting to look for directories");
      end if;

      --  Check the object directory

      declare
         Object_Dir : constant Variable_Value :=
                        Util.Value_Of (Name_Object_Dir, Data.Decl.Attributes);

      begin
         pragma Assert (Object_Dir.Kind = Single,
                        "Object_Dir is not a single string");

         --  We set the object directory to its default

         Data.Object_Directory   := Data.Directory;
         Data.Display_Object_Dir := Data.Display_Directory;

         if Object_Dir.Value /= Empty_String then

            Get_Name_String (Object_Dir.Value);

            if Name_Len = 0 then
               Error_Msg
                 (Project,
                  "Object_Dir cannot be empty",
                  Object_Dir.Location);

            else
               --  We check that the specified object directory
               --  does exist.

               Locate_Directory
                 (Object_Dir.Value, Data.Display_Directory,
                  Data.Object_Directory, Data.Display_Object_Dir);

               if Data.Object_Directory = No_Name then
                  --  The object directory does not exist, report an error
                  Err_Vars.Error_Msg_Name_1 := Object_Dir.Value;
                  Error_Msg
                    (Project,
                     "the object directory { cannot be found",
                     Data.Location);

                  --  Do not keep a nil Object_Directory. Set it to the
                  --  specified (relative or absolute) path.
                  --  This is for the benefit of tools that recover from
                  --  errors; for example, these tools could create the
                  --  non existent directory.

                  Data.Display_Object_Dir := Object_Dir.Value;
                  Get_Name_String (Object_Dir.Value);
                  Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
                  Data.Object_Directory := Name_Find;
               end if;
            end if;
         end if;
      end;

      if Current_Verbosity = High then
         if Data.Object_Directory = No_Name then
            Write_Line ("No object directory");
         else
            Write_Str ("Object directory: """);
            Write_Str (Get_Name_String (Data.Display_Object_Dir));
            Write_Line ("""");
         end if;
      end if;

      --  Check the exec directory

      declare
         Exec_Dir : constant Variable_Value :=
                      Util.Value_Of (Name_Exec_Dir, Data.Decl.Attributes);

      begin
         pragma Assert (Exec_Dir.Kind = Single,
                        "Exec_Dir is not a single string");

         --  We set the object directory to its default

         Data.Exec_Directory   := Data.Object_Directory;
         Data.Display_Exec_Dir := Data.Display_Object_Dir;

         if Exec_Dir.Value /= Empty_String then

            Get_Name_String (Exec_Dir.Value);

            if Name_Len = 0 then
               Error_Msg
                 (Project,
                  "Exec_Dir cannot be empty",
                  Exec_Dir.Location);

            else
               --  We check that the specified object directory
               --  does exist.

               Locate_Directory
                 (Exec_Dir.Value, Data.Directory,
                  Data.Exec_Directory, Data.Display_Exec_Dir);

               if Data.Exec_Directory = No_Name then
                  Err_Vars.Error_Msg_Name_1 := Exec_Dir.Value;
                  Error_Msg
                    (Project,
                     "the exec directory { cannot be found",
                     Data.Location);
               end if;
            end if;
         end if;
      end;

      if Current_Verbosity = High then
         if Data.Exec_Directory = No_Name then
            Write_Line ("No exec directory");
         else
            Write_Str ("Exec directory: """);
            Write_Str (Get_Name_String (Data.Display_Exec_Dir));
            Write_Line ("""");
         end if;
      end if;

      --  Look for the source directories

      declare
         Source_Dirs : constant Variable_Value :=
                         Util.Value_Of
                           (Name_Source_Dirs, Data.Decl.Attributes);

      begin
         if Current_Verbosity = High then
            Write_Line ("Starting to look for source directories");
         end if;

         pragma Assert (Source_Dirs.Kind = List,
                          "Source_Dirs is not a list");

         if Source_Dirs.Default then

            --  No Source_Dirs specified: the single source directory
            --  is the one containing the project file

            String_Elements.Increment_Last;
            Data.Source_Dirs := String_Elements.Last;
            String_Elements.Table (Data.Source_Dirs) :=
              (Value    => Data.Directory,
               Display_Value => Data.Display_Directory,
               Location => No_Location,
               Flag     => False,
               Next     => Nil_String);

            if Current_Verbosity = High then
               Write_Line ("Single source directory:");
               Write_Str ("    """);
               Write_Str (Get_Name_String (Data.Display_Directory));
               Write_Line ("""");
            end if;

         elsif Source_Dirs.Values = Nil_String then

            --  If Source_Dirs is an empty string list, this means
            --  that this project contains no source. For projects that
            --  don't extend other projects, this also means that there is no
            --  need for an object directory, if not specified.

            if Data.Extends = No_Project
              and then  Data.Object_Directory = Data.Directory
            then
               Data.Object_Directory := No_Name;
            end if;

            Data.Source_Dirs     := Nil_String;
            Data.Sources_Present := False;

         else
            declare
               Source_Dir : String_List_Id := Source_Dirs.Values;
               Element    : String_Element;

            begin
               --  We will find the source directories for each
               --  element of the list

               while Source_Dir /= Nil_String loop
                  Element := String_Elements.Table (Source_Dir);
                  Find_Source_Dirs (Element.Value, Element.Location);
                  Source_Dir := Element.Next;
               end loop;
            end;
         end if;

         if Current_Verbosity = High then
            Write_Line ("Putting source directories in canonical cases");
         end if;

         declare
            Current : String_List_Id := Data.Source_Dirs;
            Element : String_Element;

         begin
            while Current /= Nil_String loop
               Element := String_Elements.Table (Current);
               if Element.Value /= No_Name then
                  Get_Name_String (Element.Value);
                  Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
                  Element.Value := Name_Find;
                  String_Elements.Table (Current) := Element;
               end if;

               Current := Element.Next;
            end loop;
         end;
      end;

      --  Library attributes

      declare
         Attributes : constant Prj.Variable_Id := Data.Decl.Attributes;

         Lib_Dir : constant Prj.Variable_Value :=
                     Prj.Util.Value_Of (Snames.Name_Library_Dir, Attributes);

         Lib_Name : constant Prj.Variable_Value :=
                      Prj.Util.Value_Of (Snames.Name_Library_Name, Attributes);

         Lib_Version : constant Prj.Variable_Value :=
                         Prj.Util.Value_Of
                           (Snames.Name_Library_Version, Attributes);

         The_Lib_Kind : constant Prj.Variable_Value :=
                          Prj.Util.Value_Of
                            (Snames.Name_Library_Kind, Attributes);

      begin
         --  Special case of extending project

         if Data.Extends /= No_Project then
            declare
               Extended_Data : constant Project_Data :=
                 Projects.Table (Data.Extends);

            begin
               --  If the project extended is a library project, we inherit
               --  the library name, if it is not redefined; we check that
               --  the library directory is specified; and we reset the
               --  library flag for the extended project.

               if Extended_Data.Library then
                  if Lib_Name.Default then
                     Data.Library_Name := Extended_Data.Library_Name;
                  end if;

                  if Lib_Dir.Default then

                     --  If the extending project is a virtual project, we
                     --  put the error message in the library project that
                     --  is extended, rather than in the extending all project.
                     --  Of course, we cannot put it in the virtual extending
                     --  project, because it has no source.

                     if Data.Virtual then
                        Error_Msg_Name_1 := Extended_Data.Name;

                        Error_Msg
                          (Project,
                           "library project % cannot be virtually extended",
                           Extended_Data.Location);

                     else
                        Error_Msg
                          (Project,
                           "a project extending a library project must " &
                           "specify an attribute Library_Dir",
                           Data.Location);
                     end if;
                  end if;

                  Projects.Table (Data.Extends).Library := False;
               end if;
            end;
         end if;

         pragma Assert (Lib_Dir.Kind = Single);

         if Lib_Dir.Value = Empty_String then

            if Current_Verbosity = High then
               Write_Line ("No library directory");
            end if;

         else
            --  Find path name, check that it is a directory

            Locate_Directory
              (Lib_Dir.Value, Data.Display_Directory,
               Data.Library_Dir, Data.Display_Library_Dir);

            if Data.Library_Dir = No_Name then

               --  Get the absolute name of the library directory that
               --  does not exist, to report an error.

               declare
                  Dir_Name : constant String :=
                    Get_Name_String (Lib_Dir.Value);
               begin
                  if Is_Absolute_Path (Dir_Name) then
                     Err_Vars.Error_Msg_Name_1 := Lib_Dir.Value;

                  else
                     Get_Name_String (Data.Display_Directory);

                     if Name_Buffer (Name_Len) /= Directory_Separator then
                        Name_Len := Name_Len + 1;
                        Name_Buffer (Name_Len) := Directory_Separator;
                     end if;

                     Name_Buffer
                       (Name_Len + 1 .. Name_Len + Dir_Name'Length) :=
                       Dir_Name;
                     Name_Len := Name_Len + Dir_Name'Length;
                     Err_Vars.Error_Msg_Name_1 := Name_Find;
                  end if;

                  --  Report the error

                  Error_Msg
                    (Project,
                     "library directory { does not exist",
                     Lib_Dir.Location);
               end;

            elsif Data.Library_Dir = Data.Object_Directory then
               Error_Msg
                 (Project,
                  "library directory cannot be the same " &
                  "as object directory",
                  Lib_Dir.Location);
               Data.Library_Dir := No_Name;
               Data.Display_Library_Dir := No_Name;

            else
               if Current_Verbosity = High then
                  Write_Str ("Library directory =""");
                  Write_Str (Get_Name_String (Data.Display_Library_Dir));
                  Write_Line ("""");
               end if;
            end if;
         end if;

         pragma Assert (Lib_Name.Kind = Single);

         if Lib_Name.Value = Empty_String then
            if Current_Verbosity = High
              and then Data.Library_Name = No_Name
            then
               Write_Line ("No library name");
            end if;

         else
            --  There is no restriction on the syntax of library names

            Data.Library_Name := Lib_Name.Value;
         end if;

         if Data.Library_Name /= No_Name
           and then Current_Verbosity = High
         then
            Write_Str ("Library name = """);
            Write_Str (Get_Name_String (Data.Library_Name));
            Write_Line ("""");
         end if;

         Data.Library :=
           Data.Library_Dir /= No_Name
             and then
           Data.Library_Name /= No_Name;

         if Data.Library then
            if MLib.Tgt.Support_For_Libraries = MLib.Tgt.None then
               Error_Msg
                 (Project,
                  "?libraries are not supported on this platform",
                  Lib_Name.Location);
               Data.Library := False;

            else
               pragma Assert (Lib_Version.Kind = Single);

               if Lib_Version.Value = Empty_String then
                  if Current_Verbosity = High then
                     Write_Line ("No library version specified");
                  end if;

               else
                  Data.Lib_Internal_Name := Lib_Version.Value;
               end if;

               pragma Assert (The_Lib_Kind.Kind = Single);

               if The_Lib_Kind.Value = Empty_String then
                  if Current_Verbosity = High then
                     Write_Line ("No library kind specified");
                  end if;

               else
                  Get_Name_String (The_Lib_Kind.Value);

                  declare
                     Kind_Name : constant String :=
                                   To_Lower (Name_Buffer (1 .. Name_Len));

                     OK : Boolean := True;

                  begin
                     if Kind_Name = "static" then
                        Data.Library_Kind := Static;

                     elsif Kind_Name = "dynamic" then
                        Data.Library_Kind := Dynamic;

                     elsif Kind_Name = "relocatable" then
                        Data.Library_Kind := Relocatable;

                     else
                        Error_Msg
                          (Project,
                           "illegal value for Library_Kind",
                           The_Lib_Kind.Location);
                        OK := False;
                     end if;

                     if Current_Verbosity = High and then OK then
                        Write_Str ("Library kind = ");
                        Write_Line (Kind_Name);
                     end if;

                     if Data.Library_Kind /= Static and then
                       MLib.Tgt.Support_For_Libraries = MLib.Tgt.Static_Only
                     then
                        Error_Msg
                          (Project,
                           "only static libraries are supported " &
                           "on this platform",
                          The_Lib_Kind.Location);
                        Data.Library := False;
                     end if;
                  end;
               end if;

               if Data.Library and then Current_Verbosity = High then
                  Write_Line ("This is a library project file");
               end if;

            end if;
         end if;
      end;

      if Current_Verbosity = High then
         Show_Source_Dirs (Project);
      end if;

      declare
         Naming_Id : constant Package_Id :=
                       Util.Value_Of (Name_Naming, Data.Decl.Packages);

         Naming    : Package_Element;

      begin
         --  If there is a package Naming, we will put in Data.Naming
         --  what is in this package Naming.

         if Naming_Id /= No_Package then
            Naming := Packages.Table (Naming_Id);

            if Current_Verbosity = High then
               Write_Line ("Checking ""Naming"".");
            end if;

            --  Check Spec_Suffix

            declare
               Spec_Suffixs : Array_Element_Id :=
                                Util.Value_Of
                                  (Name_Spec_Suffix,
                                   Naming.Decl.Arrays);
               Suffix  : Array_Element_Id;
               Element : Array_Element;
               Suffix2 : Array_Element_Id;

            begin
               --  If some suffixs have been specified, we make sure that
               --  for each language for which a default suffix has been
               --  specified, there is a suffix specified, either the one
               --  in the project file or if there were none, the default.

               if Spec_Suffixs /= No_Array_Element then
                  Suffix := Data.Naming.Spec_Suffix;

                  while Suffix /= No_Array_Element loop
                     Element := Array_Elements.Table (Suffix);
                     Suffix2 := Spec_Suffixs;

                     while Suffix2 /= No_Array_Element loop
                        exit when Array_Elements.Table (Suffix2).Index =
                          Element.Index;
                        Suffix2 := Array_Elements.Table (Suffix2).Next;
                     end loop;

                     --  There is a registered default suffix, but no
                     --  suffix specified in the project file.
                     --  Add the default to the array.

                     if Suffix2 = No_Array_Element then
                        Array_Elements.Increment_Last;
                        Array_Elements.Table (Array_Elements.Last) :=
                          (Index => Element.Index,
                           Index_Case_Sensitive => False,
                           Value => Element.Value,
                           Next  => Spec_Suffixs);
                        Spec_Suffixs := Array_Elements.Last;
                     end if;

                     Suffix := Element.Next;
                  end loop;

                  --  Put the resulting array as the specification suffixs

                  Data.Naming.Spec_Suffix := Spec_Suffixs;
               end if;
            end;

            declare
               Current : Array_Element_Id := Data.Naming.Spec_Suffix;
               Element : Array_Element;

            begin
               while Current /= No_Array_Element loop
                  Element := Array_Elements.Table (Current);
                  Get_Name_String (Element.Value.Value);

                  if Name_Len = 0 then
                     Error_Msg
                       (Project,
                        "Spec_Suffix cannot be empty",
                        Element.Value.Location);
                  end if;

                  Array_Elements.Table (Current) := Element;
                  Current := Element.Next;
               end loop;
            end;

            --  Check Body_Suffix

            declare
               Impl_Suffixs : Array_Element_Id :=
                                Util.Value_Of
                                  (Name_Body_Suffix,
                                   Naming.Decl.Arrays);

               Suffix  : Array_Element_Id;
               Element : Array_Element;
               Suffix2 : Array_Element_Id;

            begin
               --  If some suffixs have been specified, we make sure that
               --  for each language for which a default suffix has been
               --  specified, there is a suffix specified, either the one
               --  in the project file or if there were noe, the default.

               if Impl_Suffixs /= No_Array_Element then
                  Suffix := Data.Naming.Body_Suffix;

                  while Suffix /= No_Array_Element loop
                     Element := Array_Elements.Table (Suffix);
                     Suffix2 := Impl_Suffixs;

                     while Suffix2 /= No_Array_Element loop
                        exit when Array_Elements.Table (Suffix2).Index =
                          Element.Index;
                        Suffix2 := Array_Elements.Table (Suffix2).Next;
                     end loop;

                     --  There is a registered default suffix, but no
                     --  suffix specified in the project file.
                     --  Add the default to the array.

                     if Suffix2 = No_Array_Element then
                        Array_Elements.Increment_Last;
                        Array_Elements.Table (Array_Elements.Last) :=
                          (Index => Element.Index,
                           Index_Case_Sensitive => False,
                           Value => Element.Value,
                           Next  => Impl_Suffixs);
                        Impl_Suffixs := Array_Elements.Last;
                     end if;

                     Suffix := Element.Next;
                  end loop;

                  --  Put the resulting array as the implementation suffixs

                  Data.Naming.Body_Suffix := Impl_Suffixs;
               end if;
            end;

            declare
               Current : Array_Element_Id := Data.Naming.Body_Suffix;
               Element : Array_Element;

            begin
               while Current /= No_Array_Element loop
                  Element := Array_Elements.Table (Current);
                  Get_Name_String (Element.Value.Value);

                  if Name_Len = 0 then
                     Error_Msg
                       (Project,
                        "Body_Suffix cannot be empty",
                        Element.Value.Location);
                  end if;

                  Array_Elements.Table (Current) := Element;
                  Current := Element.Next;
               end loop;
            end;

            --  Get the exceptions, if any

            Data.Naming.Specification_Exceptions :=
              Util.Value_Of
                (Name_Specification_Exceptions,
                 In_Arrays => Naming.Decl.Arrays);

            Data.Naming.Implementation_Exceptions :=
              Util.Value_Of
                (Name_Implementation_Exceptions,
                 In_Arrays => Naming.Decl.Arrays);
         end if;
      end;

      Projects.Table (Project) := Data;
   end Language_Independent_Check;

   ----------------------
   -- Locate_Directory --
   ----------------------

   procedure Locate_Directory
     (Name    : Name_Id;
      Parent  : Name_Id;
      Dir     : out Name_Id;
      Display : out Name_Id)
   is
      The_Name   : constant String := Get_Name_String (Name);
      The_Parent : constant String :=
                     Get_Name_String (Parent) & Directory_Separator;
      The_Parent_Last : constant Natural :=
                     Compute_Directory_Last (The_Parent);

   begin
      if Current_Verbosity = High then
         Write_Str ("Locate_Directory (""");
         Write_Str (The_Name);
         Write_Str (""", """);
         Write_Str (The_Parent);
         Write_Line (""")");
      end if;

      Dir     := No_Name;
      Display := No_Name;

      if Is_Absolute_Path (The_Name) then
         if Is_Directory (The_Name) then
            declare
               Normed : constant String :=
                          Normalize_Pathname
                            (The_Name,
                             Resolve_Links  => False,
                             Case_Sensitive => True);

               Canonical_Path : constant String :=
                                  Normalize_Pathname
                                    (Normed,
                                     Resolve_Links  => True,
                                     Case_Sensitive => False);

            begin
               Name_Len := Normed'Length;
               Name_Buffer (1 .. Name_Len) := Normed;
               Display := Name_Find;

               Name_Len := Canonical_Path'Length;
               Name_Buffer (1 .. Name_Len) := Canonical_Path;
               Dir := Name_Find;
            end;
         end if;

      else
         declare
            Full_Path : constant String :=
                          The_Parent (The_Parent'First .. The_Parent_Last) &
                          The_Name;

         begin
            if Is_Directory (Full_Path) then
               declare
                  Normed : constant String :=
                             Normalize_Pathname
                               (Full_Path,
                                Resolve_Links  => False,
                                Case_Sensitive => True);

                  Canonical_Path : constant String :=
                                     Normalize_Pathname
                                       (Normed,
                                        Resolve_Links  => True,
                                        Case_Sensitive => False);

               begin
                  Name_Len := Normed'Length;
                  Name_Buffer (1 .. Name_Len) := Normed;
                  Display := Name_Find;

                  Name_Len := Canonical_Path'Length;
                  Name_Buffer (1 .. Name_Len) := Canonical_Path;
                  Dir := Name_Find;
               end;
            end if;
         end;
      end if;
   end Locate_Directory;

   ------------------
   -- Path_Name_Of --
   ------------------

   function Path_Name_Of
     (File_Name : Name_Id;
      Directory : Name_Id) return String
   is
      Result : String_Access;
      The_Directory : constant String := Get_Name_String (Directory);

   begin
      Get_Name_String (File_Name);
      Result := Locate_Regular_File
        (File_Name => Name_Buffer (1 .. Name_Len),
         Path      => The_Directory);

      if Result = null then
         return "";
      else
         Canonical_Case_File_Name (Result.all);
         return Result.all;
      end if;
   end Path_Name_Of;

   ---------------------
   -- Project_Extends --
   ---------------------

   function Project_Extends
     (Extending : Project_Id;
      Extended  : Project_Id) return Boolean
   is
      Current : Project_Id := Extending;
   begin
      loop
         if Current = No_Project then
            return False;

         elsif Current = Extended then
            return True;
         end if;

         Current := Projects.Table (Current).Extends;
      end loop;
   end Project_Extends;

   -------------------
   -- Record_Source --
   -------------------

   procedure Record_Source
     (File_Name       : Name_Id;
      Path_Name       : Name_Id;
      Project         : Project_Id;
      Data            : in out Project_Data;
      Location        : Source_Ptr;
      Current_Source  : in out String_List_Id;
      Source_Recorded : in out Boolean;
      Trusted_Mode    : Boolean)
   is
      Canonical_File_Name : Name_Id;
      Canonical_Path_Name : Name_Id;
      Unit_Name    : Name_Id;
      Unit_Kind    : Spec_Or_Body;
      Needs_Pragma : Boolean;

      The_Location    : Source_Ptr     := Location;
      Previous_Source : constant String_List_Id := Current_Source;
      Except_Name     : Name_Id        := No_Name;

      Unit_Prj : Unit_Project;

   begin
      Get_Name_String (File_Name);
      Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
      Canonical_File_Name := Name_Find;

      declare
         Canonical_Path : constant String :=
                            Normalize_Pathname
                              (Get_Name_String (Path_Name),
                               Resolve_Links => not Trusted_Mode,
                               Case_Sensitive => False);
      begin
         Name_Len := 0;
         Add_Str_To_Name_Buffer (Canonical_Path);
         Canonical_Path_Name := Name_Find;
      end;

      --  Find out the unit name, the unit kind and if it needs
      --  a specific SFN pragma.

      Get_Unit
        (Canonical_File_Name => Canonical_File_Name,
         Naming              => Data.Naming,
         Unit_Name           => Unit_Name,
         Unit_Kind           => Unit_Kind,
         Needs_Pragma        => Needs_Pragma);

      if Unit_Name = No_Name then
         if Current_Verbosity = High then
            Write_Str  ("   """);
            Write_Str  (Get_Name_String (Canonical_File_Name));
            Write_Line (""" is not a valid source file name (ignored).");
         end if;

      else
         --  Check to see if the source has been hidden by an exception,
         --  but only if it is not an exception.

         if not Needs_Pragma then
            Except_Name :=
              Reverse_Naming_Exceptions.Get ((Unit_Kind, Unit_Name));

            if Except_Name /= No_Name then
               if Current_Verbosity = High then
                  Write_Str  ("   """);
                  Write_Str  (Get_Name_String (Canonical_File_Name));
                  Write_Str  (""" contains a unit that is found in """);
                  Write_Str  (Get_Name_String (Except_Name));
                  Write_Line (""" (ignored).");
               end if;

               --  The file is not included in the source of the project,
               --  because it is hidden by the exception.
               --  So, there is nothing else to do.

               return;
            end if;
         end if;

         --  Put the file name in the list of sources of the project

         String_Elements.Increment_Last;
         String_Elements.Table (String_Elements.Last) :=
           (Value         => Canonical_File_Name,
            Display_Value => File_Name,
            Location      => No_Location,
            Flag          => False,
            Next          => Nil_String);

         if Current_Source = Nil_String then
            Data.Sources := String_Elements.Last;

         else
            String_Elements.Table (Current_Source).Next :=
              String_Elements.Last;
         end if;

         Current_Source := String_Elements.Last;

         --  Put the unit in unit list

         declare
            The_Unit      : Unit_Id := Units_Htable.Get (Unit_Name);
            The_Unit_Data : Unit_Data;

         begin
            if Current_Verbosity = High then
               Write_Str  ("Putting ");
               Write_Str  (Get_Name_String (Unit_Name));
               Write_Line (" in the unit list.");
            end if;

            --  The unit is already in the list, but may be it is
            --  only the other unit kind (spec or body), or what is
            --  in the unit list is a unit of a project we are extending.

            if The_Unit /= Prj.Com.No_Unit then
               The_Unit_Data := Units.Table (The_Unit);

               if The_Unit_Data.File_Names (Unit_Kind).Name = No_Name
                 or else Project_Extends
                           (Data.Extends,
                            The_Unit_Data.File_Names (Unit_Kind).Project)
               then
                  if The_Unit_Data.File_Names (Unit_Kind).Path = Slash then
                     Remove_Forbidden_File_Name
                       (The_Unit_Data.File_Names (Unit_Kind).Name);
                  end if;

                  --  Record the file name in the hash table Files_Htable

                  Unit_Prj := (Unit => The_Unit, Project => Project);
                  Files_Htable.Set (Canonical_File_Name, Unit_Prj);

                  The_Unit_Data.File_Names (Unit_Kind) :=
                    (Name         => Canonical_File_Name,
                     Display_Name => File_Name,
                     Path         => Canonical_Path_Name,
                     Display_Path => Path_Name,
                     Project      => Project,
                     Needs_Pragma => Needs_Pragma);
                  Units.Table (The_Unit) := The_Unit_Data;
                  Source_Recorded := True;

               elsif The_Unit_Data.File_Names (Unit_Kind).Project = Project
                 and then (Data.Known_Order_Of_Source_Dirs or else
                           The_Unit_Data.File_Names (Unit_Kind).Path =
                                                          Canonical_Path_Name)
               then
                  if Previous_Source = Nil_String then
                     Data.Sources := Nil_String;
                  else
                     String_Elements.Table (Previous_Source).Next :=
                       Nil_String;
                     String_Elements.Decrement_Last;
                  end if;

                  Current_Source := Previous_Source;

               else
                  --  It is an error to have two units with the same name
                  --  and the same kind (spec or body).

                  if The_Location = No_Location then
                     The_Location := Projects.Table (Project).Location;
                  end if;

                  Err_Vars.Error_Msg_Name_1 := Unit_Name;
                  Error_Msg (Project, "duplicate source {", The_Location);

                  Err_Vars.Error_Msg_Name_1 :=
                    Projects.Table
                      (The_Unit_Data.File_Names (Unit_Kind).Project).Name;
                  Err_Vars.Error_Msg_Name_2 :=
                    The_Unit_Data.File_Names (Unit_Kind).Path;
                  Error_Msg (Project, "\   project file {, {", The_Location);

                  Err_Vars.Error_Msg_Name_1 := Projects.Table (Project).Name;
                  Err_Vars.Error_Msg_Name_2 := Canonical_Path_Name;
                  Error_Msg (Project, "\   project file {, {", The_Location);

               end if;

            --  It is a new unit, create a new record

            else
               --  First, check if there is no other unit with this file name
               --  in another project. If it is, report an error.

               Unit_Prj := Files_Htable.Get (Canonical_File_Name);

               if Unit_Prj /= No_Unit_Project then
                  Error_Msg_Name_1 := File_Name;
                  Error_Msg_Name_2 := Projects.Table (Unit_Prj.Project).Name;
                  Error_Msg
                    (Project,
                     "{ is already a source of project {",
                     Location);

               else
                  Units.Increment_Last;
                  The_Unit := Units.Last;
                  Units_Htable.Set (Unit_Name, The_Unit);
                  Unit_Prj := (Unit => The_Unit, Project => Project);
                  Files_Htable.Set (Canonical_File_Name, Unit_Prj);
                  The_Unit_Data.Name := Unit_Name;
                  The_Unit_Data.File_Names (Unit_Kind) :=
                    (Name         => Canonical_File_Name,
                     Display_Name => File_Name,
                     Path         => Canonical_Path_Name,
                     Display_Path => Path_Name,
                     Project      => Project,
                     Needs_Pragma => Needs_Pragma);
                  Units.Table (The_Unit) := The_Unit_Data;
                  Source_Recorded := True;
               end if;
            end if;
         end;
      end if;
   end Record_Source;

   ----------------------
   -- Show_Source_Dirs --
   ----------------------

   procedure Show_Source_Dirs (Project : Project_Id) is
      Current : String_List_Id := Projects.Table (Project).Source_Dirs;
      Element : String_Element;

   begin
      Write_Line ("Source_Dirs:");

      while Current /= Nil_String loop
         Element := String_Elements.Table (Current);
         Write_Str  ("   ");
         Write_Line (Get_Name_String (Element.Value));
         Current := Element.Next;
      end loop;

      Write_Line ("end Source_Dirs.");
   end Show_Source_Dirs;

end Prj.Nmsc;
