------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                            M L I B . P R J                               --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--              Copyright (C) 2001-2005, Ada Core Technologies, 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 ALI;      use ALI;
with Gnatvsn;  use Gnatvsn;
with Hostparm;
with MLib.Fil; use MLib.Fil;
with MLib.Tgt; use MLib.Tgt;
with MLib.Utl; use MLib.Utl;
with Namet;    use Namet;
with Opt;
with Osint;    use Osint;
with Output;   use Output;
with Prj.Com;  use Prj.Com;
with Prj.Env;  use Prj.Env;
with Prj.Util; use Prj.Util;
with Sinput.P;
with Snames;   use Snames;
with Switch;   use Switch;
with Table;
with Types;    use Types;

with Ada.Characters.Handling;

with GNAT.Directory_Operations; use GNAT.Directory_Operations;
with GNAT.HTable;
with GNAT.OS_Lib;               use GNAT.OS_Lib;
with Interfaces.C_Streams;      use Interfaces.C_Streams;
with System;                    use System;
with System.Case_Util;          use System.Case_Util;

package body MLib.Prj is

   Prj_Add_Obj_Files : Types.Int;
   pragma Import (C, Prj_Add_Obj_Files, "__gnat_prj_add_obj_files");
   Add_Object_Files : constant Boolean := Prj_Add_Obj_Files /= 0;
   --  Indicates if object files in pragmas Linker_Options (found in the
   --  binder generated file) should be taken when linking aq stand-alone
   --  library.
   --  False for Windows, True for other platforms.

   ALI_Suffix : constant String := ".ali";
   B_Start    : String := "b~";

   S_Osinte_Ads : Name_Id := No_Name;
   --  Name_Id for "s-osinte.ads"

   S_Dec_Ads : Name_Id := No_Name;
   --  Name_Id for "dec.ads"

   G_Trasym_Ads : Name_Id := No_Name;
   --  Name_Id for "g-trasym.ads"

   No_Argument_List : aliased String_List := (1 .. 0 => null);
   No_Argument      : constant String_List_Access := No_Argument_List'Access;

   Arguments : String_List_Access := No_Argument;
   --  Used to accumulate arguments for the invocation of gnatbind and of
   --  the compiler. Also used to collect the interface ALI when copying
   --  the ALI files to the library directory.

   Argument_Number : Natural := 0;
   --  Index of the last argument in Arguments

   Initial_Argument_Max : constant := 10;

   No_Main_String : aliased String := "-n";
   No_Main : constant String_Access := No_Main_String'Access;

   Output_Switch_String : aliased String := "-o";
   Output_Switch : constant String_Access := Output_Switch_String'Access;

   Compile_Switch_String : aliased String := "-c";
   Compile_Switch : constant String_Access := Compile_Switch_String'Access;

   --  List of objects to put inside the library

   Object_Files : Argument_List_Access;

   package Objects is new Table.Table
     (Table_Name           => "Mlib.Prj.Objects",
      Table_Component_Type => String_Access,
      Table_Index_Type     => Natural,
      Table_Low_Bound      => 1,
      Table_Initial        => 50,
      Table_Increment      => 100);

   package Objects_Htable is new GNAT.HTable.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Boolean,
      No_Element => False,
      Key        => Name_Id,
      Hash       => Hash,
      Equal      => "=");

   --  List of non-Ada object files

   Foreign_Objects : Argument_List_Access;

   package Foreigns is new Table.Table
     (Table_Name           => "Mlib.Prj.Foreigns",
      Table_Component_Type => String_Access,
      Table_Index_Type     => Natural,
      Table_Low_Bound      => 1,
      Table_Initial        => 20,
      Table_Increment      => 100);

   --  List of ALI files

   Ali_Files : Argument_List_Access;

   package ALIs is new Table.Table
     (Table_Name           => "Mlib.Prj.Alis",
      Table_Component_Type => String_Access,
      Table_Index_Type     => Natural,
      Table_Low_Bound      => 1,
      Table_Initial        => 50,
      Table_Increment      => 100);

   --  List of options set in the command line.

   Options : Argument_List_Access;

   package Opts is new Table.Table
     (Table_Name           => "Mlib.Prj.Opts",
      Table_Component_Type => String_Access,
      Table_Index_Type     => Natural,
      Table_Low_Bound      => 1,
      Table_Initial        => 5,
      Table_Increment      => 100);

   --  All the ALI file in the library

   package Library_ALIs is new GNAT.HTable.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Boolean,
      No_Element => False,
      Key        => Name_Id,
      Hash       => Hash,
      Equal      => "=");

   --  The ALI files in the interface sets

   package Interface_ALIs is new GNAT.HTable.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Boolean,
      No_Element => False,
      Key        => Name_Id,
      Hash       => Hash,
      Equal      => "=");

   --  The ALI files that have been processed to check if the corresponding
   --  library unit is in the interface set.

   package Processed_ALIs is new GNAT.HTable.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Boolean,
      No_Element => False,
      Key        => Name_Id,
      Hash       => Hash,
      Equal      => "=");

   --  The projects imported directly or indirectly.

   package Processed_Projects is new GNAT.HTable.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Boolean,
      No_Element => False,
      Key        => Name_Id,
      Hash       => Hash,
      Equal      => "=");

   --  The library projects imported directly or indirectly.

   package Library_Projs is new Table.Table (
     Table_Component_Type => Project_Id,
     Table_Index_Type     => Integer,
     Table_Low_Bound      => 1,
     Table_Initial        => 10,
     Table_Increment      => 10,
     Table_Name           => "Make.Library_Projs");

   type Build_Mode_State is (None, Static, Dynamic, Relocatable);

   procedure Add_Argument (S : String);
   --  Add one argument to the array Arguments.
   --  If Arguments is full, double its size.

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

   procedure Check (Filename : String);
   --  Check if filename is a regular file. Fail if it is not.

   procedure Check_Context;
   --  Check each object files in table Object_Files
   --  Fail if any of them is not a regular file

   procedure Clean (Directory : Name_Id);
   --  Attempt to delete all files in Directory, but not subdirectories

   procedure Copy_Interface_Sources
     (For_Project : Project_Id;
      Interfaces  : Argument_List;
      To_Dir      : Name_Id);
   --  Copy the interface sources of a SAL to directory To_Dir

   procedure Display (Executable : String);
   --  Display invocation of gnatbind and of the compiler with the arguments
   --  in Arguments, except when Quiet_Output is True.

   procedure Process_Binder_File (Name : String);
   --  For Stand-Alone libraries, get the Linker Options in the binder
   --  generated file.

   procedure Reset_Tables;
   --  Make sure that all the above tables are empty
   --  (Objects, Foreign_Objects, Ali_Files, Options).

   ------------------
   -- Add_Argument --
   ------------------

   procedure Add_Argument (S : String) is
   begin
      if Argument_Number = Arguments'Last then
         declare
            New_Args : constant String_List_Access :=
              new String_List (1 .. 2 * Arguments'Last);

         begin
            --  Copy the String_Accesses and set them to null in Arguments
            --  so that they will not be deallocated by the call to
            --  Free (Arguments).

            New_Args (Arguments'Range) := Arguments.all;
            Arguments.all := (others => null);
            Free (Arguments);
            Arguments := New_Args;
         end;
      end if;

      Argument_Number := Argument_Number + 1;
      Arguments (Argument_Number) := new String'(S);
   end Add_Argument;

   -------------------
   -- 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;

   -------------------
   -- Build_Library --
   -------------------

   procedure Build_Library
     (For_Project   : Project_Id;
      Gnatbind      : String;
      Gnatbind_Path : String_Access;
      Gcc           : String;
      Gcc_Path      : String_Access;
      Bind          : Boolean := True;
      Link          : Boolean := True)
   is
      Warning_For_Library : Boolean := False;
      --  Set to True for the first warning about a unit missing from the
      --  interface set.

      Libgnarl_Needed   : Boolean := False;
      --  Set to True if library needs to be linked with libgnarl

      Libdecgnat_Needed : Boolean := False;
      --  On OpenVMS, set to True if library needs to be linked with libdecgnat

      Gtrasymobj_Needed : Boolean := False;
      --  On OpenVMS, set to True if library needs to be linked with
      --  g-trasym.obj.

      Data : Project_Data := Projects.Table (For_Project);

      Object_Directory_Path : constant String :=
                          Get_Name_String (Data.Object_Directory);

      Standalone   : constant Boolean := Data.Standalone_Library;

      Project_Name : constant String := Get_Name_String (Data.Name);

      Current_Dir  : constant String := Get_Current_Dir;

      Lib_Filename : String_Access;
      Lib_Dirpath  : String_Access;
      Lib_Version  : String_Access := new String'("");

      The_Build_Mode : Build_Mode_State := None;

      Success : Boolean := False;

      Library_Options : Variable_Value := Nil_Variable_Value;

      Library_GCC     : Variable_Value := Nil_Variable_Value;

      Driver_Name : Name_Id := No_Name;

      In_Main_Object_Directory : Boolean := True;

      Rpath : String_Access := null;
      --  Allocated only if Path Option is supported

      Rpath_Last : Natural := 0;
      --  Index of last valid character of Rpath

      Initial_Rpath_Length : constant := 200;
      --  Initial size of Rpath, when first allocated

      Path_Option : String_Access := Linker_Library_Path_Option;
      --  If null, Path Option is not supported.
      --  Not a constant so that it can be deallocated.

      Copy_Dir : Name_Id;
      --  Directory where to copy ALI files and possibly interface sources

      First_ALI : Name_Id := No_Name;
      --  Store the ALI file name of a source of the library (the first found)

      procedure Add_ALI_For (Source : Name_Id);
      --  Add the name of the ALI file corresponding to Source to the
      --  Arguments.

      procedure Add_Rpath (Path : String);
      --  Add a path name to Rpath

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

      procedure Check_Libs (ALI_File : String);
      --  Set Libgnarl_Needed if the ALI_File indicates that there is a need
      --  to link with -lgnarl (this is the case when there is a dependency
      --  on s-osinte.ads). On OpenVMS, set Libdecgnat_Needed if the ALI file
      --  indicates that there is a need to link with -ldecgnat (this is the
      --  case when there is a dependency on dec.ads), and set
      --  Gtrasymobj_Needed if there is a dependency on g-trasym.ads.

      procedure Process (The_ALI : File_Name_Type);
      --  Check if the closure of a library unit which is or should be in the
      --  interface set is also in the interface set. Issue a warning for each
      --  missing library unit.

      procedure Process_Imported_Libraries;
      --  Add the -L and -l switches for the imported Library Project Files,
      --  and, if Path Option is supported, the library directory path names
      --  to Rpath.

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

      procedure Add_ALI_For (Source : Name_Id) is
         ALI    : constant String := ALI_File_Name (Get_Name_String (Source));
         ALI_Id : Name_Id;

      begin
         if Bind then
            Add_Argument (ALI);
         end if;

         Name_Len := 0;
         Add_Str_To_Name_Buffer (S => ALI);
         ALI_Id := Name_Find;

         --  Add the ALI file name to the library ALIs

         if Bind then
            Library_ALIs.Set (ALI_Id, True);
         end if;

         --  Set First_ALI, if not already done

         if First_ALI = No_Name then
            First_ALI := ALI_Id;
         end if;
      end Add_ALI_For;

      ---------------
      -- Add_Rpath --
      ---------------

      procedure Add_Rpath (Path : String) is

         procedure Double;
         --  Double Rpath size

         ------------
         -- Double --
         ------------

         procedure Double is
            New_Rpath : constant String_Access :=
                          new String (1 .. 2 * Rpath'Length);
         begin
            New_Rpath (1 .. Rpath_Last) := Rpath (1 .. Rpath_Last);
            Free (Rpath);
            Rpath := New_Rpath;
         end Double;

      --  Start of processing for Add_Rpath

      begin
         --  If firt path, allocate initial Rpath

         if Rpath = null then
            Rpath := new String (1 .. Initial_Rpath_Length);
            Rpath_Last := 0;

         else
            --  Otherwise, add a path separator between two path names

            if Rpath_Last = Rpath'Last then
               Double;
            end if;

            Rpath_Last := Rpath_Last + 1;
            Rpath (Rpath_Last) := Path_Separator;
         end if;

         --  Increase Rpath size until it is large enough

         while Rpath_Last + Path'Length > Rpath'Last loop
            Double;
         end loop;

         --  Add the path name

         Rpath (Rpath_Last + 1 .. Rpath_Last + Path'Length) := Path;
         Rpath_Last := Rpath_Last + Path'Length;
      end Add_Rpath;

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

      function Check_Project (P : Project_Id) return Boolean is
      begin
         if P = For_Project then
            return True;

         elsif P /= No_Project then
            declare
               Data : Project_Data := Projects.Table (For_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;

      ----------------
      -- Check_Libs --
      ----------------

      procedure Check_Libs (ALI_File : String) is
         Lib_File : Name_Id;
         Text     : Text_Buffer_Ptr;
         Id       : ALI.ALI_Id;

      begin
         if not Libgnarl_Needed or
           (Hostparm.OpenVMS and then
              ((not Libdecgnat_Needed) or
               (not Gtrasymobj_Needed)))
         then
            --  Scan the ALI file

            Name_Len := ALI_File'Length;
            Name_Buffer (1 .. Name_Len) := ALI_File;
            Lib_File := Name_Find;
            Text := Read_Library_Info (Lib_File, True);

            Id  := ALI.Scan_ALI
                         (F          => Lib_File,
                          T          => Text,
                          Ignore_ED  => False,
                          Err        => True,
                          Read_Lines => "D");
            Free (Text);

            --  Look for s-osinte.ads in the dependencies

            for Index in ALI.ALIs.Table (Id).First_Sdep ..
                         ALI.ALIs.Table (Id).Last_Sdep
            loop
               if ALI.Sdep.Table (Index).Sfile = S_Osinte_Ads then
                  Libgnarl_Needed := True;

               elsif Hostparm.OpenVMS then
                  if ALI.Sdep.Table (Index).Sfile = S_Dec_Ads then
                     Libdecgnat_Needed := True;

                  elsif ALI.Sdep.Table (Index).Sfile = G_Trasym_Ads then
                     Gtrasymobj_Needed := True;
                  end if;
               end if;
            end loop;
         end if;
      end Check_Libs;

      -------------
      -- Process --
      -------------

      procedure Process (The_ALI : File_Name_Type) is
         Text       : Text_Buffer_Ptr;
         Idread     : ALI_Id;
         First_Unit : ALI.Unit_Id;
         Last_Unit  : ALI.Unit_Id;
         Unit_Data  : Unit_Record;
         Afile      : File_Name_Type;

      begin
         --  Nothing to do if the ALI file has already been processed.
         --  This happens if an interface imports another interface.

         if not Processed_ALIs.Get (The_ALI) then
            Processed_ALIs.Set (The_ALI, True);
            Text := Read_Library_Info (The_ALI);

            if Text /= null then
               Idread :=
                 Scan_ALI
                   (F         => The_ALI,
                    T         => Text,
                    Ignore_ED => False,
                    Err       => True);
               Free (Text);

               if Idread /= No_ALI_Id then
                  First_Unit := ALI.ALIs.Table (Idread).First_Unit;
                  Last_Unit  := ALI.ALIs.Table (Idread).Last_Unit;

                  --  Process both unit (spec and body) if the body is needed
                  --  by the spec (inline or generic). Otherwise, just process
                  --  the spec.

                  if First_Unit /= Last_Unit and then
                    not ALI.Units.Table (Last_Unit).Body_Needed_For_SAL
                  then
                     First_Unit := Last_Unit;
                  end if;

                  for Unit in First_Unit .. Last_Unit loop
                     Unit_Data := ALI.Units.Table (Unit);

                     --  Check if each withed unit which is in the library is
                     --  also in the interface set, if it has not yet been
                     --  processed.

                     for W in Unit_Data.First_With .. Unit_Data.Last_With loop
                        Afile := Withs.Table (W).Afile;

                        if Afile /= No_Name and then Library_ALIs.Get (Afile)
                          and then not Processed_ALIs.Get (Afile)
                        then
                           if not Interface_ALIs.Get (Afile) then
                              if not Warning_For_Library then
                                 Write_Str ("Warning: In library project """);
                                 Get_Name_String (Data.Name);
                                 To_Mixed (Name_Buffer (1 .. Name_Len));
                                 Write_Str (Name_Buffer (1 .. Name_Len));
                                 Write_Line ("""");
                                 Warning_For_Library := True;
                              end if;

                              Write_Str ("         Unit """);
                              Get_Name_String (Withs.Table (W).Uname);
                              To_Mixed (Name_Buffer (1 .. Name_Len - 2));
                              Write_Str (Name_Buffer (1 .. Name_Len - 2));
                              Write_Line (""" is not in the interface set");
                              Write_Str ("         but it is needed by ");

                              case Unit_Data.Utype is
                                 when Is_Spec =>
                                    Write_Str ("the spec of ");

                                 when Is_Body =>
                                    Write_Str ("the body of ");

                                 when others =>
                                    null;
                              end case;

                              Write_Str ("""");
                              Get_Name_String (Unit_Data.Uname);
                              To_Mixed (Name_Buffer (1 .. Name_Len - 2));
                              Write_Str (Name_Buffer (1 .. Name_Len - 2));
                              Write_Line ("""");
                           end if;

                           --  Now, process this unit

                           Process (Afile);
                        end if;
                     end loop;
                  end loop;
               end if;
            end if;
         end if;
      end Process;

      --------------------------------
      -- Process_Imported_Libraries --
      --------------------------------

      procedure Process_Imported_Libraries is
         Current : Project_Id;

         procedure Process_Project (Project : Project_Id);
         --  Process Project and its imported projects recursively.
         --  Add any library projects to table Library_Projs.

         ---------------------
         -- Process_Project --
         ---------------------

         procedure Process_Project (Project : Project_Id) is
            Data     : constant Project_Data := Projects.Table (Project);
            Imported : Project_List := Data.Imported_Projects;
            Element  : Project_Element;

         begin
            --  Nothing to do if process has already been processed

            if not Processed_Projects.Get (Data.Name) then
               Processed_Projects.Set (Data.Name, True);

               --  Call Process_Project recursively for any imported project.
               --  We first process the imported projects to guarantee that
               --  we have a proper reverse order for the libraries.

               while Imported /= Empty_Project_List loop
                  Element := Project_Lists.Table (Imported);

                  if Element.Project /= No_Project then
                     Process_Project (Element.Project);
                  end if;

                  Imported := Element.Next;
               end loop;

               --  If it is a library project, add it to Library_Projs

               if Project /= For_Project and then Data.Library then
                  Library_Projs.Increment_Last;
                  Library_Projs.Table (Library_Projs.Last) := Project;
               end if;

            end if;
         end Process_Project;

      --  Start of processing for Process_Imported_Libraries

      begin
         --  Build list of library projects imported directly or indirectly,
         --  in the reverse order.

         Process_Project (For_Project);

         --  Add the -L and -l switches and, if the Rpath option is supported,
         --  add the directory to the Rpath.
         --  As the library projects are in the wrong order, process from the
         --  last to the first.

         for Index in reverse 1 .. Library_Projs.Last loop
            Current := Library_Projs.Table (Index);

            Get_Name_String (Projects.Table (Current).Library_Dir);
            Opts.Increment_Last;
            Opts.Table (Opts.Last) :=
              new String'("-L" & Name_Buffer (1 .. Name_Len));

            if Path_Option /= null then
               Add_Rpath (Name_Buffer (1 .. Name_Len));
            end if;

            Opts.Increment_Last;
            Opts.Table (Opts.Last) :=
              new String'
                ("-l" &
                 Get_Name_String
                   (Projects.Table (Current).Library_Name));
         end loop;
      end Process_Imported_Libraries;

   --  Start of processing for Build_Library

   begin
      Reset_Tables;

      --  Fail if project is not a library project

      if not Data.Library then
         Com.Fail ("project """, Project_Name, """ has no library");
      end if;

      --  If this is the first time Build_Library is called, get the Name_Id
      --  of "s-osinte.ads".

      if S_Osinte_Ads = No_Name then
         Name_Len := 0;
         Add_Str_To_Name_Buffer ("s-osinte.ads");
         S_Osinte_Ads := Name_Find;
      end if;

      if S_Dec_Ads = No_Name then
         Name_Len := 0;
         Add_Str_To_Name_Buffer ("dec.ads");
         S_Dec_Ads := Name_Find;
      end if;

      if G_Trasym_Ads = No_Name then
         Name_Len := 0;
         Add_Str_To_Name_Buffer ("g-trasym.ads");
         G_Trasym_Ads := Name_Find;
      end if;

      --  We work in the object directory

      Change_Dir (Object_Directory_Path);

      if Standalone then
         --  Call gnatbind only if Bind is True

         if Bind then
            if Gnatbind_Path = null then
               Com.Fail ("unable to locate ", Gnatbind);
            end if;

            if Gcc_Path = null then
               Com.Fail ("unable to locate ", Gcc);
            end if;

            --  Allocate Arguments, if it is the first time we see a standalone
            --  library.

            if Arguments = No_Argument then
               Arguments := new String_List (1 .. Initial_Argument_Max);
            end if;

            --  Add "-n -o b~<lib>.adb (b$<lib>.adb on VMS) -L<lib>"

            Argument_Number := 2;
            Arguments (1) := No_Main;
            Arguments (2) := Output_Switch;

            if Hostparm.OpenVMS then
               B_Start (B_Start'Last) := '$';
            end if;

            Add_Argument
              (B_Start & Get_Name_String (Data.Library_Name) & ".adb");
            Add_Argument ("-L" & Get_Name_String (Data.Library_Name));

            --  Check if Binder'Default_Switches ("Ada) is defined. If it is,
            --  add these switches to call gnatbind.

            declare
               Binder_Package : constant Package_Id :=
                                  Value_Of
                                    (Name        => Name_Binder,
                                     In_Packages => Data.Decl.Packages);

            begin
               if Binder_Package /= No_Package then
                  declare
                     Defaults : constant Array_Element_Id :=
                                  Value_Of
                                    (Name      => Name_Default_Switches,
                                     In_Arrays =>
                                       Packages.Table
                                         (Binder_Package).Decl.Arrays);
                     Switches : Variable_Value := Nil_Variable_Value;

                     Switch : String_List_Id := Nil_String;

                  begin
                     if Defaults /= No_Array_Element then
                        Switches :=
                          Value_Of
                            (Index     => Name_Ada,
                             Src_Index => 0,
                             In_Array  => Defaults);

                        if not Switches.Default then
                           Switch := Switches.Values;

                           while Switch /= Nil_String loop
                              Add_Argument
                                (Get_Name_String
                                   (String_Elements.Table (Switch).Value));
                              Switch := String_Elements.Table (Switch).Next;
                           end loop;
                        end if;
                     end if;
                  end;
               end if;
            end;
         end if;

         --  Get all the ALI files of the project file. We do that even if
         --  Bind is False, so that First_ALI is set.

         declare
            Unit : Unit_Data;

         begin
            Library_ALIs.Reset;
            Interface_ALIs.Reset;
            Processed_ALIs.Reset;

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

               if Unit.File_Names (Body_Part).Name /= No_Name
                 and then Unit.File_Names (Body_Part).Path /= Slash
               then
                  if
                    Check_Project (Unit.File_Names (Body_Part).Project)
                  then
                     if Unit.File_Names (Specification).Name = No_Name then
                        declare
                           Src_Ind : Source_File_Index;

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

                           --  Add the ALI file only if it is not a subunit

                           if
                           not Sinput.P.Source_File_Is_Subunit (Src_Ind)
                           then
                              Add_ALI_For
                                (Unit.File_Names (Body_Part).Name);
                              exit when not Bind;
                           end if;
                        end;

                     else
                        Add_ALI_For (Unit.File_Names (Body_Part).Name);
                        exit when not Bind;
                     end if;
                  end if;

               elsif Unit.File_Names (Specification).Name /= No_Name
                 and then Unit.File_Names (Specification).Path /= Slash
                 and then Check_Project
                   (Unit.File_Names (Specification).Project)
               then
                  Add_ALI_For (Unit.File_Names (Specification).Name);
                  exit when not Bind;
               end if;
            end loop;
         end;

         --  Continue setup and call gnatbind if Bind is True

         if Bind then

            --  Get an eventual --RTS from the ALI file

            if First_ALI /= No_Name then
               declare
                  use Types;
                  T : Text_Buffer_Ptr;
                  A : ALI_Id;

               begin
                  --  Load the ALI file

                  T := Read_Library_Info (First_ALI, True);

                  --  Read it

                  A := Scan_ALI
                         (First_ALI, T, Ignore_ED => False, Err => False);

                  if A /= No_ALI_Id then
                     for Index in
                       ALI.Units.Table
                         (ALI.ALIs.Table (A).First_Unit).First_Arg ..
                       ALI.Units.Table
                         (ALI.ALIs.Table (A).First_Unit).Last_Arg
                     loop
                        --  Look for --RTS. If found, add the switch to call
                        --  gnatbind.

                        declare
                           Arg : String_Ptr renames Args.Table (Index);
                        begin
                           if
                             Arg (Arg'First + 2 .. Arg'First + 5) = "RTS="
                           then
                              Add_Argument (Arg.all);
                              exit;
                           end if;
                        end;
                     end loop;
                  end if;
               end;
            end if;

            --  Set the paths

            Set_Ada_Paths
              (Project => For_Project, Including_Libraries => True);

            --  Display the gnatbind command, if not in quiet output

            Display (Gnatbind);

            --  Invoke gnatbind

            GNAT.OS_Lib.Spawn
              (Gnatbind_Path.all, Arguments (1 .. Argument_Number), Success);

            if not Success then
               Com.Fail ("could not bind standalone library ",
                         Get_Name_String (Data.Library_Name));
            end if;
         end if;

         --  Compile the binder generated file only if Link is true

         if Link then
            --  Set the paths

            Set_Ada_Paths
              (Project => For_Project, Including_Libraries => True);

            --  Invoke <gcc> -c b$$<lib>.adb

            --  Allocate Arguments, if it is the first time we see a standalone
            --  library.

            if Arguments = No_Argument then
               Arguments := new String_List (1 .. Initial_Argument_Max);
            end if;

            Argument_Number := 1;
            Arguments (1) := Compile_Switch;

            if Hostparm.OpenVMS then
               B_Start (B_Start'Last) := '$';
            end if;

            Add_Argument
              (B_Start & Get_Name_String (Data.Library_Name) & ".adb");

            --  If necessary, add the PIC option

            if PIC_Option /= "" then
               Add_Argument (PIC_Option);
            end if;

            --  Get the back-end switches and --RTS from the ALI file

            if First_ALI /= No_Name then
               declare
                  use Types;
                  T : Text_Buffer_Ptr;
                  A : ALI_Id;

               begin
                  --  Load the ALI file

                  T := Read_Library_Info (First_ALI, True);

                  --  Read it

                  A := Scan_ALI
                         (First_ALI, T, Ignore_ED => False, Err => False);

                  if A /= No_ALI_Id then
                     for Index in
                       ALI.Units.Table
                         (ALI.ALIs.Table (A).First_Unit).First_Arg ..
                       ALI.Units.Table
                         (ALI.ALIs.Table (A).First_Unit).Last_Arg
                     loop
                        --  Do not compile with the front end switches except
                        --  for --RTS.

                        declare
                           Arg : String_Ptr renames Args.Table (Index);
                        begin
                           if not Is_Front_End_Switch (Arg.all)
                             or else
                               Arg (Arg'First + 2 .. Arg'First + 5) = "RTS="
                           then
                              Add_Argument (Arg.all);
                           end if;
                        end;
                     end loop;
                  end if;
               end;
            end if;

            --  Now that all the arguments are set, compile the binder
            --  generated file.

            Display (Gcc);
            GNAT.OS_Lib.Spawn
              (Gcc_Path.all, Arguments (1 .. Argument_Number), Success);

            if not Success then
               Com.Fail
                 ("could not compile binder generated file for library ",
                  Get_Name_String (Data.Library_Name));
            end if;

            --  Process binder generated file for pragmas Linker_Options

            Process_Binder_File (Arguments (2).all & ASCII.NUL);
         end if;
      end if;

      --  Build the library only if Link is True

      if Link then
         --  If attribute Library_GCC was specified, get the driver name

         Library_GCC := Value_Of (Name_Library_GCC, Data.Decl.Attributes);

         if not Library_GCC.Default then
            Driver_Name := Library_GCC.Value;
         end if;

         --  If attribute Library_Options was specified, add these additional
         --  options.

         Library_Options :=
           Value_Of (Name_Library_Options, Data.Decl.Attributes);

         if not Library_Options.Default then
            declare
               Current : String_List_Id := Library_Options.Values;
               Element : String_Element;

            begin
               while Current /= Nil_String loop
                  Element := String_Elements.Table (Current);
                  Get_Name_String (Element.Value);

                  if Name_Len /= 0 then
                     Opts.Increment_Last;
                     Opts.Table (Opts.Last) :=
                       new String'(Name_Buffer (1 .. Name_Len));
                  end if;

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

         Lib_Dirpath  := new String'(Get_Name_String (Data.Library_Dir));
         Lib_Filename := new String'(Get_Name_String (Data.Library_Name));

         case Data.Library_Kind is
            when Static =>
               The_Build_Mode := Static;

            when Dynamic =>
               The_Build_Mode := Dynamic;

            when Relocatable =>
               The_Build_Mode := Relocatable;

               if PIC_Option /= "" then
                  Opts.Increment_Last;
                  Opts.Table (Opts.Last) := new String'(PIC_Option);
               end if;
         end case;

         --  Get the library version, if any

         if Data.Lib_Internal_Name /= No_Name then
            Lib_Version :=
              new String'(Get_Name_String (Data.Lib_Internal_Name));
         end if;

         --  Add the objects found in the object directory and the object
         --  directories of the extended files, if any, except for generated
         --  object files (b~.. or B$..) from extended projects.
         --  When there are one or more extended files, only add an object file
         --  if no object file with the same name have already been added.

         In_Main_Object_Directory := True;

         loop
            declare
               Object_Dir_Path : constant String :=
                                   Get_Name_String (Data.Object_Directory);
               Object_Dir      : Dir_Type;
               Filename        : String (1 .. 255);
               Last            : Natural;
               Id              : Name_Id;

            begin
               Open (Dir => Object_Dir, Dir_Name => Object_Dir_Path);

               --  For all entries in the object directory

               loop
                  Read (Object_Dir, Filename, Last);

                  exit when Last = 0;

                  --  Check if it is an object file

                  if Is_Obj (Filename (1 .. Last)) then
                     declare
                        Object_Path : String :=
                          Normalize_Pathname
                            (Object_Dir_Path & Directory_Separator &
                             Filename (1 .. Last));

                     begin
                        Canonical_Case_File_Name (Object_Path);
                        Canonical_Case_File_Name (Filename (1 .. Last));

                        --  If in the object directory of an extended project,
                        --  do not consider generated object files.

                        if In_Main_Object_Directory
                          or else Last < 5
                          or else Filename (1 .. B_Start'Length) /= B_Start
                        then
                           Name_Len := Last;
                           Name_Buffer (1 .. Name_Len) := Filename (1 .. Last);
                           Id := Name_Find;

                           if not Objects_Htable.Get (Id) then

                              --  Record this object file

                              Objects_Htable.Set (Id, True);
                              Objects.Increment_Last;
                              Objects.Table (Objects.Last) :=
                                new String'(Object_Path);

                              declare
                                 ALI_File : constant String :=
                                              Ext_To (Object_Path, "ali");

                              begin
                                 if Is_Regular_File (ALI_File) then

                                    --  Record the ALI file

                                    ALIs.Increment_Last;
                                    ALIs.Table (ALIs.Last) :=
                                      new String'(ALI_File);

                                    --  Find out if for this ALI file,
                                    --  libgnarl or libdecgnat or g-trasym.obj
                                    --  (on OpenVMS) is necessary.

                                    Check_Libs (ALI_File);

                                 else
                                    --  Object file is a foreign object file

                                    Foreigns.Increment_Last;
                                    Foreigns.Table (Foreigns.Last) :=
                                      new String'(Object_Path);
                                 end if;
                              end;
                           end if;
                        end if;
                     end;
                  end if;
               end loop;

               Close (Dir => Object_Dir);

            exception
               when Directory_Error =>
                  Com.Fail ("cannot find object directory """,
                            Get_Name_String (Data.Object_Directory),
                            """");
            end;

            exit when Data.Extends = No_Project;

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

         --  Add the -L and -l switches for the imported Library Project Files,
         --  and, if Path Option is supported, the library directory path names
         --  to Rpath.

         Process_Imported_Libraries;

         --  Link with libgnat and possibly libgnarl

         Opts.Increment_Last;
         Opts.Table (Opts.Last) := new String'("-L" & Lib_Directory);

         --  If Path Option is supported, add libgnat directory path name to
         --  Rpath.

         if Path_Option /= null then
            Add_Rpath (Lib_Directory);
         end if;

         if Libgnarl_Needed then
            Opts.Increment_Last;

            if The_Build_Mode = Static then
               Opts.Table (Opts.Last) := new String'("-lgnarl");
            else
               Opts.Table (Opts.Last) := new String'(Shared_Lib ("gnarl"));
            end if;
         end if;

         if Gtrasymobj_Needed then
            Opts.Increment_Last;
            Opts.Table (Opts.Last) :=
              new String'(Lib_Directory & "/g-trasym.obj");
         end if;

         if Libdecgnat_Needed then
            Opts.Increment_Last;
            Opts.Table (Opts.Last) :=
              new String'("-L" & Lib_Directory & "/../declib");
            Opts.Increment_Last;
            Opts.Table (Opts.Last) := new String'("-ldecgnat");
         end if;

         Opts.Increment_Last;

         if The_Build_Mode = Static then
            Opts.Table (Opts.Last) := new String'("-lgnat");
         else
            Opts.Table (Opts.Last) := new String'(Shared_Lib ("gnat"));
         end if;

         --  If Path Option is supported, add the necessary switch with the
         --  content of Rpath. As Rpath contains at least libgnat directory
         --  path name, it is guaranteed that it is not null.

         if Path_Option /= null then
            Opts.Increment_Last;
            Opts.Table (Opts.Last) :=
              new String'(Path_Option.all & Rpath (1 .. Rpath_Last));
            Free (Path_Option);
            Free (Rpath);
         end if;

         Object_Files :=
           new Argument_List'
             (Argument_List (Objects.Table (1 .. Objects.Last)));

         Foreign_Objects :=
           new Argument_List'(Argument_List
                                (Foreigns.Table (1 .. Foreigns.Last)));

         Ali_Files :=
           new Argument_List'(Argument_List (ALIs.Table (1 .. ALIs.Last)));

         Options :=
           new Argument_List'(Argument_List (Opts.Table (1 .. Opts.Last)));

         --  We fail if there are no object to put in the library
         --  (Ada or foreign objects).

         if Object_Files'Length = 0 then
            Com.Fail ("no object files for library """ &
                      Lib_Filename.all & '"');
         end if;

         if not Opt.Quiet_Output then
            Write_Eol;
            Write_Str  ("building ");
            Write_Str (Ada.Characters.Handling.To_Lower
                         (Build_Mode_State'Image (The_Build_Mode)));
            Write_Str  (" library for project ");
            Write_Line (Project_Name);

            Write_Eol;

            Write_Line ("object files:");

            for Index in Object_Files'Range loop
               Write_Str  ("   ");
               Write_Line (Object_Files (Index).all);
            end loop;

            Write_Eol;

            if Ali_Files'Length = 0 then
               Write_Line ("NO ALI files");

            else
               Write_Line ("ALI files:");

               for Index in Ali_Files'Range loop
                  Write_Str  ("   ");
                  Write_Line (Ali_Files (Index).all);
               end loop;
            end if;

            Write_Eol;
         end if;

         --  We check that all object files are regular files

         Check_Context;

         --  Delete the existing library file, if it exists.
         --  Fail if the library file is not writable, or if it is not possible
         --  to delete the file.

         declare
            DLL_Name : aliased String :=
                         Lib_Dirpath.all & "/lib" &
                           Lib_Filename.all & "." & DLL_Ext;

            Archive_Name : aliased String :=
                             Lib_Dirpath.all & "/lib" &
                               Lib_Filename.all & "." & Archive_Ext;

            type Str_Ptr is access all String;
            --  This type is necessary to meet the accessibility rules of Ada.
            --  It is not possible to use String_Access here.

            Full_Lib_Name : Str_Ptr;
            --  Designates the full library path name. Either DLL_Name or
            --  Archive_Name, depending on the library kind.

            Success : Boolean := False;
            --  Used to call Delete_File

         begin
            if The_Build_Mode = Static then
               Full_Lib_Name := Archive_Name'Access;
            else
               Full_Lib_Name := DLL_Name'Access;
            end if;

            if Is_Regular_File (Full_Lib_Name.all) then
               if Is_Writable_File (Full_Lib_Name.all) then
                  Delete_File (Full_Lib_Name.all, Success);
               end if;

               if Is_Regular_File (Full_Lib_Name.all) then
                  Com.Fail ("could not delete """ & Full_Lib_Name.all & """");
               end if;
            end if;
         end;

         Argument_Number := 0;

         --  If we have a standalone library, gather all the interface ALI.
         --  They are passed to Build_Dynamic_Library, where they are used by
         --  some platforms (VMS, for example) to decide what symbols should be
         --  exported. They are also flagged as Interface when we copy them to
         --  the library directory (by Copy_ALI_Files, below).

         if Standalone then
            Data := Projects.Table (For_Project);

            declare
               Iface : String_List_Id := Data.Lib_Interface_ALIs;
               ALI   : File_Name_Type;

            begin
               while Iface /= Nil_String loop
                  ALI := String_Elements.Table (Iface).Value;
                  Interface_ALIs.Set (ALI, True);
                  Get_Name_String (String_Elements.Table (Iface).Value);
                  Add_Argument (Name_Buffer (1 .. Name_Len));
                  Iface := String_Elements.Table (Iface).Next;
               end loop;

               Iface := Data.Lib_Interface_ALIs;

               if not Opt.Quiet_Output then

                  --  Check that the interface set is complete: any unit in the
                  --  library that is needed by an interface should also be an
                  --  interface. If it is not the case, output a warning.

                  while Iface /= Nil_String loop
                     ALI := String_Elements.Table (Iface).Value;
                     Process (ALI);
                     Iface := String_Elements.Table (Iface).Next;
                  end loop;
               end if;
            end;
         end if;

         --  Clean the library directory, if it is also the directory where
         --  the ALI files are copied, either because there is no interface
         --  copy directory or because the interface copy directory is the
         --  same as the library directory.

         Copy_Dir := Projects.Table (For_Project).Library_Dir;
         Clean (Copy_Dir);

         --  Call procedure to build the library, depending on the build mode

         case The_Build_Mode is
            when Dynamic | Relocatable =>
               Build_Dynamic_Library
                 (Ofiles        => Object_Files.all,
                  Foreign       => Foreign_Objects.all,
                  Afiles        => Ali_Files.all,
                  Options       => Options.all,
                  Options_2     => No_Argument_List,
                  Interfaces    => Arguments (1 .. Argument_Number),
                  Lib_Filename  => Lib_Filename.all,
                  Lib_Dir       => Lib_Dirpath.all,
                  Symbol_Data   => Data.Symbol_Data,
                  Driver_Name   => Driver_Name,
                  Lib_Version   => Lib_Version.all,
                  Auto_Init     => Data.Lib_Auto_Init);

            when Static =>
               MLib.Build_Library
                 (Object_Files.all,
                  Ali_Files.all,
                  Lib_Filename.all,
                  Lib_Dirpath.all);

            when None =>
               null;
         end case;

         --  We need to copy the ALI files from the object directory to
         --  the library directory, so that the linker find them there,
         --  and does not need to look in the object directory where it
         --  would also find the object files; and we don't want that:
         --  we want the linker to use the library.

         --  Copy the ALI files and make the copies read-only. For interfaces,
         --  mark the copies as interfaces.

         Copy_ALI_Files
           (Files      => Ali_Files.all,
            To         => Copy_Dir,
            Interfaces => Arguments (1 .. Argument_Number));

         --  Copy interface sources if Library_Src_Dir specified

         if Standalone
           and then Projects.Table (For_Project).Library_Src_Dir /= No_Name
         then
            --  Clean the interface copy directory, if it is not also the
            --  library directory. If it is also the library directory, it
            --  has already been cleaned before generation of the library.

            if Projects.Table (For_Project).Library_Src_Dir /= Copy_Dir then
               Copy_Dir := Projects.Table (For_Project).Library_Src_Dir;
               Clean (Copy_Dir);
            end if;

            Copy_Interface_Sources
              (For_Project => For_Project,
               Interfaces => Arguments (1 .. Argument_Number),
               To_Dir => Copy_Dir);
         end if;
      end if;

      --  Reset the current working directory to its previous value

      Change_Dir (Current_Dir);
   end Build_Library;

   -----------
   -- Check --
   -----------

   procedure Check (Filename : String) is
   begin
      if not Is_Regular_File (Filename) then
         Com.Fail (Filename, " not found.");
      end if;
   end Check;

   -------------------
   -- Check_Context --
   -------------------

   procedure Check_Context is
   begin
      --  Check that each object file exists

      for F in Object_Files'Range loop
         Check (Object_Files (F).all);
      end loop;
   end Check_Context;

   -------------------
   -- Check_Library --
   -------------------

   procedure Check_Library (For_Project : Project_Id) is
      Data : constant Project_Data := Projects.Table (For_Project);

   begin
      --  No need to build the library if there is no object directory,
      --  hence no object files to build the library.

      if Data.Library
        and then not Data.Need_To_Build_Lib
        and then Data.Object_Directory /= No_Name
      then
         declare
            Current  : constant Dir_Name_Str := Get_Current_Dir;
            Lib_Name : constant Name_Id := Library_File_Name_For (For_Project);
            Lib_TS   : Time_Stamp_Type;
            Obj_TS   : Time_Stamp_Type;

            Object_Dir : Dir_Type;

         begin
            if Hostparm.OpenVMS then
               B_Start (B_Start'Last) := '$';
            end if;

            Change_Dir (Get_Name_String (Data.Library_Dir));

            Lib_TS := File_Stamp (Lib_Name);

            --  If the library file does not exist, then the time stamp will
            --  be Empty_Time_Stamp, earlier than any other time stamp.

            Change_Dir (Get_Name_String (Data.Object_Directory));
            Open (Dir => Object_Dir, Dir_Name => ".");

            --  For all entries in the object directory

            loop
               Read (Object_Dir, Name_Buffer, Name_Len);
               exit when Name_Len = 0;

               --  Check if it is an object file, but ignore any binder
               --  generated file.

               if Is_Obj (Name_Buffer (1 .. Name_Len))
                  and then Name_Buffer (1 .. B_Start'Length) /= B_Start
               then
                  --  Get the object file time stamp

                  Obj_TS := File_Stamp (Name_Find);

                  --  If library file time stamp is earlier, set
                  --  Need_To_Build_Lib and return. String comparaison is used,
                  --  otherwise time stamps may be too close and the
                  --  comparaison would return True, which would trigger
                  --  an unnecessary rebuild of the library.

                  if String (Lib_TS) < String (Obj_TS) then

                     --  Library must be rebuilt

                     Projects.Table (For_Project).Need_To_Build_Lib := True;
                     exit;
                  end if;
               end if;
            end loop;

            Change_Dir (Current);
         end;
      end if;
   end Check_Library;

   -----------
   -- Clean --
   -----------

   procedure Clean (Directory : Name_Id) is
      Current  : constant Dir_Name_Str := Get_Current_Dir;

      Dir : Dir_Type;

      Name : String (1 .. 200);
      Last : Natural;

      Disregard : Boolean;

   begin
      Get_Name_String (Directory);

      --  Change the working directory to the directory to clean

      begin
         Change_Dir (Name_Buffer (1 .. Name_Len));

      exception
         when others =>
            Com.Fail
              ("unable to access directory """,
               Name_Buffer (1 .. Name_Len),
               """");
      end;

      Open (Dir, ".");

      --  For each regular file in the directory, make it writable and
      --  delete the file.

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

         if Is_Regular_File (Name (1 .. Last)) then
            Set_Writable (Name (1 .. Last));
            Delete_File (Name (1 .. Last), Disregard);
         end if;
      end loop;

      Close (Dir);

      --  Restore the initial working directory

      Change_Dir (Current);
   end Clean;

   ----------------------------
   -- Copy_Interface_Sources --
   ----------------------------

   procedure Copy_Interface_Sources
     (For_Project : Project_Id;
      Interfaces  : Argument_List;
      To_Dir      : Name_Id)
   is
      Current  : constant Dir_Name_Str := Get_Current_Dir;
      Target   : constant Dir_Name_Str := Get_Name_String (To_Dir);

      Text     : Text_Buffer_Ptr;
      The_ALI  : ALI.ALI_Id;
      Lib_File : Name_Id;

      First_Unit  : ALI.Unit_Id;
      Second_Unit : ALI.Unit_Id;

      Data : Unit_Data;

      Copy_Subunits : Boolean := False;

      procedure Copy (File_Name : Name_Id);
      --  Copy one source of the project to the target directory

      ----------
      -- Copy --
      ----------

      procedure Copy (File_Name : Name_Id) is
         Success : Boolean := False;

      begin
         Unit_Loop :
         for Index in 1 .. Com.Units.Last loop
            Data := Com.Units.Table (Index);

            for J in Data.File_Names'Range loop
               if Data.File_Names (J).Project = For_Project
                 and then Data.File_Names (J).Name = File_Name
               then
                  Copy_File
                    (Get_Name_String (Data.File_Names (J).Path),
                     Target,
                     Success,
                     Mode => Overwrite,
                     Preserve => Preserve);
                  exit Unit_Loop;
               end if;
            end loop;
         end loop Unit_Loop;
      end Copy;

      use ALI;

   --  Start of processing for Copy_Interface_Sources

   begin
      --  Change the working directory to the object directory

      Change_Dir
        (Get_Name_String (Projects.Table (For_Project).Object_Directory));

      for Index in Interfaces'Range loop

         --  First, load the ALI file

         Name_Len := 0;
         Add_Str_To_Name_Buffer (Interfaces (Index).all);
         Lib_File := Name_Find;
         Text := Read_Library_Info (Lib_File);
         The_ALI := Scan_ALI (Lib_File, Text, Ignore_ED => False, Err => True);
         Free (Text);

         Second_Unit := No_Unit_Id;
         First_Unit := ALI.ALIs.Table (The_ALI).First_Unit;
         Copy_Subunits := True;

         --  If there is both a spec and a body, check if they are both needed

         if ALI.Units.Table (First_Unit).Utype = Is_Body then
            Second_Unit := ALI.ALIs.Table (The_ALI).Last_Unit;

            --  If the body is not needed, then reset First_Unit

            if not ALI.Units.Table (Second_Unit).Body_Needed_For_SAL then
               First_Unit := No_Unit_Id;
               Copy_Subunits := False;
            end if;

         elsif ALI.Units.Table (First_Unit).Utype = Is_Spec_Only then
            Copy_Subunits := False;
         end if;

         --  Copy the file(s) that need to be copied

         if First_Unit /= No_Unit_Id then
            Copy (File_Name => ALI.Units.Table (First_Unit).Sfile);
         end if;

         if Second_Unit /= No_Unit_Id then
            Copy (File_Name => ALI.Units.Table (Second_Unit).Sfile);
         end if;

         --  Copy all the separates, if any

         if Copy_Subunits then
            for Dep in ALI.ALIs.Table (The_ALI).First_Sdep ..
              ALI.ALIs.Table (The_ALI).Last_Sdep
            loop
               if Sdep.Table (Dep).Subunit_Name /= No_Name then
                  Copy (File_Name => Sdep.Table (Dep).Sfile);
               end if;
            end loop;
         end if;
      end loop;

      --  Restore the initial working directory

      Change_Dir (Current);
   end Copy_Interface_Sources;

   -------------
   -- Display --
   -------------

   procedure Display (Executable : String) is
   begin
      if not Opt.Quiet_Output then
         Write_Str (Executable);

         for Index in 1 .. Argument_Number loop
            Write_Char (' ');
            Write_Str (Arguments (Index).all);
         end loop;

         Write_Eol;
      end if;
   end Display;

   -------------------------
   -- Process_Binder_File --
   -------------------------

   procedure Process_Binder_File (Name : String) is
      Fd : FILEs;
      --  Binder file's descriptor

      Read_Mode  : constant String := "r" & ASCII.Nul;
      --  For fopen

      Status : Interfaces.C_Streams.int;
      pragma Unreferenced (Status);
      --  For fclose

      Begin_Info : constant String := "--  BEGIN Object file/option list";
      End_Info   : constant String := "--  END Object file/option list   ";

      Next_Line : String (1 .. 1000);
      --  Current line value
      --  Where does this odd constant 1000 come from, looks suspicious ???

      Nlast : Integer;
      --  End of line slice (the slice does not contain the line terminator)

      procedure Get_Next_Line;
      --  Read the next line from the binder file without the line terminator

      -------------------
      -- Get_Next_Line --
      -------------------

      procedure Get_Next_Line is
         Fchars : chars;

      begin
         Fchars := fgets (Next_Line'Address, Next_Line'Length, Fd);

         if Fchars = System.Null_Address then
            Fail ("Error reading binder output");
         end if;

         Nlast := 1;
         while Nlast <= Next_Line'Last
           and then Next_Line (Nlast) /= ASCII.LF
           and then Next_Line (Nlast) /= ASCII.CR
         loop
            Nlast := Nlast + 1;
         end loop;

         Nlast := Nlast - 1;
      end Get_Next_Line;

   --  Start of processing for Process_Binder_File

   begin
      Fd := fopen (Name'Address, Read_Mode'Address);

      if Fd = NULL_Stream then
         Fail ("Failed to open binder output");
      end if;

      --  Skip up to the Begin Info line

      loop
         Get_Next_Line;
         exit when Next_Line (1 .. Nlast) = Begin_Info;
      end loop;

      --  Find the first switch

      loop
         Get_Next_Line;

         exit when Next_Line (1 .. Nlast) = End_Info;

         --  As the binder generated file is in Ada, remove the first eight
         --  characters "   --   ".

         Next_Line (1 .. Nlast - 8) := Next_Line (9 .. Nlast);
         Nlast := Nlast - 8;

         --  Stop when the first switch is found

         exit when Next_Line (1) = '-';
      end loop;

      if Next_Line (1 .. Nlast) /= End_Info then
         loop
            --  Ignore -static and -shared, since -shared will be used
            --  in any case.

            --  Ignore -lgnat, -lgnarl and -ldecgnat as they will be added
            --  later, because they are also needed for non Stand-Alone shared
            --  libraries.

            --  Also ignore the shared libraries which are :

            --  UNIX / Windows    VMS
            --  -lgnat-<version>  -lgnat_<version>  (7 + version'length chars)
            --  -lgnarl-<version> -lgnarl_<version> (8 + version'length chars)

            if Next_Line (1 .. Nlast) /= "-static" and then
               Next_Line (1 .. Nlast) /= "-shared" and then
               Next_Line (1 .. Nlast) /= "-ldecgnat" and then
               Next_Line (1 .. Nlast) /= "-lgnarl" and then
               Next_Line (1 .. Nlast) /= "-lgnat" and then
               Next_Line
                 (1 .. Natural'Min (Nlast, 8 + Library_Version'Length)) /=
                   Shared_Lib ("gnarl") and then
               Next_Line
                 (1 .. Natural'Min (Nlast, 7 + Library_Version'Length)) /=
                   Shared_Lib ("gnat")
            then
               if Next_Line (1) /= '-' then

                  --  This is not an option, should we add it?

                  if Add_Object_Files then
                     Opts.Increment_Last;
                     Opts.Table (Opts.Last) :=
                       new String'(Next_Line (1 .. Nlast));
                  end if;

               else
                  --  Add all other options

                  Opts.Increment_Last;
                  Opts.Table (Opts.Last) :=
                    new String'(Next_Line (1 .. Nlast));
               end if;
            end if;

            --  Next option, if any

            Get_Next_Line;
            exit when Next_Line (1 .. Nlast) = End_Info;

            --  Remove first eight characters "   --   "

            Next_Line (1 .. Nlast - 8) := Next_Line (9 .. Nlast);
            Nlast := Nlast - 8;
         end loop;
      end if;

      Status := fclose (Fd);
      --  Is it really right to ignore any close error ???
   end Process_Binder_File;

   ------------------
   -- Reset_Tables --
   ------------------

   procedure Reset_Tables is
   begin
      Objects.Init;
      Objects_Htable.Reset;
      Foreigns.Init;
      ALIs.Init;
      Opts.Init;
      Processed_Projects.Reset;
      Library_Projs.Init;
   end Reset_Tables;

end MLib.Prj;