path: root/gcc/ada/gnatcmd.adb

------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                              G N A T C M D                               --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 1996-2014, 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 3,  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 COPYING3.  If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license.          --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

with GNAT.Directory_Operations; use GNAT.Directory_Operations;

with Csets;
with Hostparm; use Hostparm;
with Makeutl;  use Makeutl;
with MLib.Tgt; use MLib.Tgt;
with MLib.Utl;
with MLib.Fil;
with Namet;    use Namet;
with Opt;      use Opt;
with Osint;    use Osint;
with Output;   use Output;
with Prj;      use Prj;
with Prj.Env;
with Prj.Ext;  use Prj.Ext;
with Prj.Pars;
with Prj.Tree; use Prj.Tree;
with Prj.Util; use Prj.Util;
with Sdefault;
with Sinput.P;
with Snames;   use Snames;
with Stringt;
with Switch;   use Switch;
with Table;
with Targparm;
with Tempdir;
with Types;    use Types;
with VMS_Conv; use VMS_Conv;
with VMS_Cmds; use VMS_Cmds;

with Ada.Characters.Handling; use Ada.Characters.Handling;
with Ada.Command_Line;        use Ada.Command_Line;
with Ada.Text_IO;             use Ada.Text_IO;

with GNAT.OS_Lib; use GNAT.OS_Lib;

procedure GNATCmd is
   Project_Node_Tree : Project_Node_Tree_Ref;
   Project_File      : String_Access;
   Project           : Prj.Project_Id;
   Current_Verbosity : Prj.Verbosity := Prj.Default;
   Tool_Package_Name : Name_Id       := No_Name;

   B_Start : String_Ptr    := new String'("b~");
   --  Prefix of binder generated file, changed to b__ for VMS

   Project_Tree : constant Project_Tree_Ref :=
                    new Project_Tree_Data (Is_Root_Tree => True);
   --  The project tree

   Old_Project_File_Used : Boolean := False;
   --  This flag indicates a switch -p (for gnatxref and gnatfind) for
   --  an old fashioned project file. -p cannot be used in conjunction
   --  with -P.

   Temp_File_Name : Path_Name_Type := No_Path;
   --  The name of the temporary text file to put a list of source/object
   --  files to pass to a tool.

   ASIS_Main : String_Access := null;
   --  Main for commands Check, Metric and Pretty, when -U is used

   package First_Switches is new Table.Table
     (Table_Component_Type => String_Access,
      Table_Index_Type     => Integer,
      Table_Low_Bound      => 1,
      Table_Initial        => 20,
      Table_Increment      => 100,
      Table_Name           => "Gnatcmd.First_Switches");
   --  A table to keep the switches from the project file

   package Carg_Switches is new Table.Table
     (Table_Component_Type => String_Access,
      Table_Index_Type     => Integer,
      Table_Low_Bound      => 1,
      Table_Initial        => 20,
      Table_Increment      => 100,
      Table_Name           => "Gnatcmd.Carg_Switches");
   --  A table to keep the switches following -cargs for ASIS tools

   package Rules_Switches is new Table.Table
     (Table_Component_Type => String_Access,
      Table_Index_Type     => Integer,
      Table_Low_Bound      => 1,
      Table_Initial        => 20,
      Table_Increment      => 100,
      Table_Name           => "Gnatcmd.Rules_Switches");
   --  A table to keep the switches following -rules for gnatcheck

   package Library_Paths is new Table.Table (
     Table_Component_Type => String_Access,
     Table_Index_Type     => Integer,
     Table_Low_Bound      => 1,
     Table_Initial        => 20,
     Table_Increment      => 100,
     Table_Name           => "Make.Library_Path");

   --  Packages of project files to pass to Prj.Pars.Parse, depending on the
   --  tool. We allocate objects because we cannot declare aliased objects
   --  as we are in a procedure, not a library level package.

   subtype SA is String_Access;

   Naming_String      : constant SA := new String'("naming");
   Binder_String      : constant SA := new String'("binder");
   Builder_String     : constant SA := new String'("builder");
   Compiler_String    : constant SA := new String'("compiler");
   Check_String       : constant SA := new String'("check");
   Synchronize_String : constant SA := new String'("synchronize");
   Eliminate_String   : constant SA := new String'("eliminate");
   Finder_String      : constant SA := new String'("finder");
   Linker_String      : constant SA := new String'("linker");
   Gnatls_String      : constant SA := new String'("gnatls");
   Pretty_String      : constant SA := new String'("pretty_printer");
   Stack_String       : constant SA := new String'("stack");
   Gnatstub_String    : constant SA := new String'("gnatstub");
   Metric_String      : constant SA := new String'("metrics");
   Xref_String        : constant SA := new String'("cross_reference");

   Packages_To_Check_By_Binder   : constant String_List_Access :=
     new String_List'((Naming_String, Binder_String));

   Packages_To_Check_By_Check : constant String_List_Access :=
     new String_List'
          ((Naming_String, Builder_String, Check_String, Compiler_String));

   Packages_To_Check_By_Sync : constant String_List_Access :=
     new String_List'((Naming_String, Synchronize_String, Compiler_String));

   Packages_To_Check_By_Eliminate : constant String_List_Access :=
     new String_List'((Naming_String, Eliminate_String, Compiler_String));

   Packages_To_Check_By_Finder    : constant String_List_Access :=
     new String_List'((Naming_String, Finder_String));

   Packages_To_Check_By_Linker    : constant String_List_Access :=
     new String_List'((Naming_String, Linker_String));

   Packages_To_Check_By_Gnatls    : constant String_List_Access :=
     new String_List'((Naming_String, Gnatls_String));

   Packages_To_Check_By_Pretty    : constant String_List_Access :=
     new String_List'((Naming_String, Pretty_String, Compiler_String));

   Packages_To_Check_By_Stack     : constant String_List_Access :=
     new String_List'((Naming_String, Stack_String));

   Packages_To_Check_By_Gnatstub  : constant String_List_Access :=
     new String_List'((Naming_String, Gnatstub_String, Compiler_String));

   Packages_To_Check_By_Metric  : constant String_List_Access :=
     new String_List'((Naming_String, Metric_String, Compiler_String));

   Packages_To_Check_By_Xref      : constant String_List_Access :=
     new String_List'((Naming_String, Xref_String));

   Packages_To_Check : String_List_Access := Prj.All_Packages;

   ----------------------------------
   -- Declarations for GNATCMD use --
   ----------------------------------

   The_Command : Command_Type;
   --  The command specified in the invocation of the GNAT driver

   Command_Arg : Positive := 1;
   --  The index of the command in the arguments of the GNAT driver

   My_Exit_Status : Exit_Status := Success;
   --  The exit status of the spawned tool. Used to set the correct VMS
   --  exit status.

   Current_Work_Dir : constant String := Get_Current_Dir;
   --  The path of the working directory

   All_Projects : Boolean := False;
   --  Flag used for GNAT CHECK, GNAT PRETTY, GNAT METRIC, and GNAT STACK to
   --  indicate that the underlying tool (gnatcheck, gnatpp or gnatmetric)
   --  should be invoked for all sources of all projects.

   Max_OpenVMS_Logical_Length : constant Integer := 255;
   --  The maximum length of OpenVMS logicals

   -----------------------
   -- Local Subprograms --
   -----------------------

   procedure Add_To_Carg_Switches (Switch : String_Access);
   --  Add a switch to the Carg_Switches table. If it is the first one, put the
   --  switch "-cargs" at the beginning of the table.

   procedure Add_To_Rules_Switches (Switch : String_Access);
   --  Add a switch to the Rules_Switches table. If it is the first one, put
   --  the switch "-crules" at the beginning of the table.

   procedure Check_Files;
   --  For GNAT LIST, GNAT PRETTY, GNAT METRIC, and GNAT STACK, check if a
   --  project file is specified, without any file arguments and without a
   --  switch -files=. If it is the case, invoke the GNAT tool with the proper
   --  list of files, derived from the sources of the project.

   function Check_Project
     (Project      : Project_Id;
      Root_Project : Project_Id) return Boolean;
   --  Returns True if Project = Root_Project or if we want to consider all
   --  sources of all projects. For GNAT METRIC, also returns True if Project
   --  is extended by Root_Project.

   procedure Check_Relative_Executable (Name : in out String_Access);
   --  Check if an executable is specified as a relative path. If it is, and
   --  the path contains directory information, fail. Otherwise, prepend the
   --  exec directory. This procedure is only used for GNAT LINK when a project
   --  file is specified.

   function Configuration_Pragmas_File return Path_Name_Type;
   --  Return an argument, if there is a configuration pragmas file to be
   --  specified for Project, otherwise return No_Name. Used for gnatstub
   --  (GNAT STUB), gnatpp (GNAT PRETTY), gnatelim (GNAT ELIM), and gnatmetric
   --  (GNAT METRIC).

   procedure Delete_Temp_Config_Files;
   --  Delete all temporary config files. The caller is responsible for
   --  ensuring that Keep_Temporary_Files is False.

   procedure Ensure_Absolute_Path
     (Switch : in out String_Access;
      Parent : String);
   --  Test if Switch is a relative search path switch. If it is and it
   --  includes directory information, prepend the path with Parent. This
   --  subprogram is only called when using project files.

   procedure Get_Closure;
   --  Get the sources in the closure of the ASIS_Main and add them to the
   --  list of arguments.

   function Mapping_File return Path_Name_Type;
   --  Create and return the path name of a mapping file. Used for gnatstub
   --  (GNAT STUB), gnatpp (GNAT PRETTY), gnatelim (GNAT ELIM), and gnatmetric
   --  (GNAT METRIC).

   procedure Non_VMS_Usage;
   --  Display usage for platforms other than VMS

   procedure Process_Link;
   --  Process GNAT LINK, when there is a project file specified

   procedure Set_Library_For
     (Project           : Project_Id;
      Tree              : Project_Tree_Ref;
      Libraries_Present : in out Boolean);
   --  If Project is a library project, add the correct -L and -l switches to
   --  the linker invocation.

   procedure Set_Libraries is new
     For_Every_Project_Imported (Boolean, Set_Library_For);
   --  Add the -L and -l switches to the linker for all the library projects

   --------------------------
   -- Add_To_Carg_Switches --
   --------------------------

   procedure Add_To_Carg_Switches (Switch : String_Access) is
   begin
      --  If the Carg_Switches table is empty, put "-cargs" at the beginning

      if Carg_Switches.Last = 0 then
         Carg_Switches.Increment_Last;
         Carg_Switches.Table (Carg_Switches.Last) := new String'("-cargs");
      end if;

      Carg_Switches.Increment_Last;
      Carg_Switches.Table (Carg_Switches.Last) := Switch;
   end Add_To_Carg_Switches;

   ---------------------------
   -- Add_To_Rules_Switches --
   ---------------------------

   procedure Add_To_Rules_Switches (Switch : String_Access) is
   begin
      --  If the Rules_Switches table is empty, put "-rules" at the beginning

      if Rules_Switches.Last = 0 then
         Rules_Switches.Increment_Last;
         Rules_Switches.Table (Rules_Switches.Last) := new String'("-rules");
      end if;

      Rules_Switches.Increment_Last;
      Rules_Switches.Table (Rules_Switches.Last) := Switch;
   end Add_To_Rules_Switches;

   -----------------
   -- Check_Files --
   -----------------

   procedure Check_Files is
      Add_Sources : Boolean := True;
      Unit        : Prj.Unit_Index;
      Subunit     : Boolean := False;
      FD          : File_Descriptor := Invalid_FD;
      Status      : Integer;
      Success     : Boolean;

      procedure Add_To_Response_File
        (File_Name  : String;
         Check_File : Boolean := True);
      --  Include the file name passed as parameter in the response file for
      --  the tool being called. If the response file can not be written then
      --  the file name is passed in the parameter list of the tool. If the
      --  Check_File parameter is True then the procedure verifies the
      --  existence of the file before adding it to the response file.

      --------------------------
      -- Add_To_Response_File --
      --------------------------

      procedure Add_To_Response_File
        (File_Name  : String;
         Check_File : Boolean := True)
      is
      begin
         Name_Len := 0;

         Add_Str_To_Name_Buffer (File_Name);

         if not Check_File or else
           Is_Regular_File (Name_Buffer (1 .. Name_Len))
         then
            if FD /= Invalid_FD then
               Name_Len := Name_Len + 1;
               Name_Buffer (Name_Len) := ASCII.LF;

               Status := Write (FD, Name_Buffer (1)'Address, Name_Len);

               if Status /= Name_Len then
                  Osint.Fail ("disk full");
               end if;
            else
               Last_Switches.Increment_Last;
               Last_Switches.Table (Last_Switches.Last) :=
                 new String'(File_Name);
            end if;
         end if;
      end Add_To_Response_File;

   --  Start of processing for Check_Files

   begin
      --  Check if there is at least one argument that is not a switch or if
      --  there is a -files= switch.

      for Index in 1 .. Last_Switches.Last loop
         if Last_Switches.Table (Index).all'Length > 7
           and then Last_Switches.Table (Index) (1 .. 7) = "-files="
         then
            Add_Sources := False;
            exit;

         elsif Last_Switches.Table (Index) (1) /= '-' then
            if Index = 1
              or else
                (The_Command = Check
                   and then Last_Switches.Table (Index - 1).all /= "-o")
              or else
                (The_Command = Pretty
                   and then Last_Switches.Table (Index - 1).all /= "-o"
                   and then Last_Switches.Table (Index - 1).all /= "-of")
              or else
                (The_Command = Metric
                   and then
                     Last_Switches.Table (Index - 1).all /= "-o"  and then
                     Last_Switches.Table (Index - 1).all /= "-og" and then
                     Last_Switches.Table (Index - 1).all /= "-ox" and then
                     Last_Switches.Table (Index - 1).all /= "-d")
              or else
                (The_Command /= Check  and then
                 The_Command /= Pretty and then
                 The_Command /= Metric)
            then
               Add_Sources := False;
               exit;
            end if;
         end if;
      end loop;

      --  If all arguments are switches and there is no switch -files=, add the
      --  path names of all the sources of the main project.

      if Add_Sources then

         --  For gnatcheck, gnatpp, and gnatmetric, create a temporary file and
         --  put the list of sources in it. For gnatstack create a temporary
         --  file with the list of .ci files.

         if The_Command = Check  or else
            The_Command = Pretty or else
            The_Command = Metric or else
            The_Command = List   or else
            The_Command = Stack
         then
            Tempdir.Create_Temp_File (FD, Temp_File_Name);
            Last_Switches.Increment_Last;
            Last_Switches.Table (Last_Switches.Last) :=
              new String'("-files=" & Get_Name_String (Temp_File_Name));
         end if;

         declare
            Proj : Project_List;

         begin
            --  Gnatstack needs to add the .ci file for the binder generated
            --  files corresponding to all of the library projects and main
            --  units belonging to the application.

            if The_Command = Stack then
               Proj := Project_Tree.Projects;
               while Proj /= null loop
                  if Check_Project (Proj.Project, Project) then
                     declare
                        Main : String_List_Id;

                     begin
                        --  Include binder generated files for main programs

                        Main := Proj.Project.Mains;
                        while Main /= Nil_String loop
                           Add_To_Response_File
                             (Get_Name_String
                                (Proj.Project.Object_Directory.Name) &
                              B_Start.all                            &
                              MLib.Fil.Ext_To
                                (Get_Name_String
                                   (Project_Tree.Shared.String_Elements.Table
                                      (Main).Value),
                                 "ci"));

                           --  When looking for the .ci file for a binder
                           --  generated file, look for both b~xxx and b__xxx
                           --  as gprbuild always uses b__ as the prefix of
                           --  such files.

                           if not Is_Regular_File (Name_Buffer (1 .. Name_Len))
                             and then B_Start.all /= "b__"
                           then
                              Add_To_Response_File
                                (Get_Name_String
                                   (Proj.Project.Object_Directory.Name) &
                                 "b__"                                  &
                                 MLib.Fil.Ext_To
                                   (Get_Name_String
                                      (Project_Tree.Shared
                                       .String_Elements.Table (Main).Value),
                                    "ci"));
                           end if;

                           Main := Project_Tree.Shared.String_Elements.Table
                                     (Main).Next;
                        end loop;

                        if Proj.Project.Library then

                           --  Include the .ci file for the binder generated
                           --  files that contains the initialization and
                           --  finalization of the library.

                           Add_To_Response_File
                             (Get_Name_String
                                (Proj.Project.Object_Directory.Name)      &
                              B_Start.all                                 &
                              Get_Name_String (Proj.Project.Library_Name) &
                              ".ci");

                           --  When looking for the .ci file for a binder
                           --  generated file, look for both b~xxx and b__xxx
                           --  as gprbuild always uses b__ as the prefix of
                           --  such files.

                           if not Is_Regular_File (Name_Buffer (1 .. Name_Len))
                               and then B_Start.all /= "b__"
                           then
                              Add_To_Response_File
                                (Get_Name_String
                                   (Proj.Project.Object_Directory.Name)      &
                                 "b__"                                       &
                                 Get_Name_String (Proj.Project.Library_Name) &
                                 ".ci");
                           end if;
                        end if;
                     end;
                  end if;

                  Proj := Proj.Next;
               end loop;
            end if;

            Unit := Units_Htable.Get_First (Project_Tree.Units_HT);
            while Unit /= No_Unit_Index loop

               --  For gnatls, we only need to put the library units, body or
               --  spec, but not the subunits.

               if The_Command = List then
                  if Unit.File_Names (Impl) /= null
                    and then not Unit.File_Names (Impl).Locally_Removed
                  then
                     --  There is a body, check if it is for this project

                     if All_Projects
                       or else Unit.File_Names (Impl).Project = Project
                     then
                        Subunit := False;

                        if Unit.File_Names (Spec) = null
                          or else Unit.File_Names (Spec).Locally_Removed
                        then
                           --  We have a body with no spec: we need to check if
                           --  this is a subunit, because gnatls will complain
                           --  about subunits.

                           declare
                              Src_Ind : constant Source_File_Index :=
                                          Sinput.P.Load_Project_File
                                            (Get_Name_String
                                              (Unit.File_Names
                                                (Impl).Path.Name));
                           begin
                              Subunit :=
                                Sinput.P.Source_File_Is_Subunit (Src_Ind);
                           end;
                        end if;

                        if not Subunit then
                           Add_To_Response_File
                             (Get_Name_String
                                (Unit.File_Names (Impl).Display_File),
                              Check_File => False);
                        end if;
                     end if;

                  elsif Unit.File_Names (Spec) /= null
                    and then not Unit.File_Names (Spec).Locally_Removed
                  then
                     --  We have a spec with no body. Check if it is for this
                     --  project.

                     if All_Projects or else
                        Unit.File_Names (Spec).Project = Project
                     then
                        Add_To_Response_File
                          (Get_Name_String
                             (Unit.File_Names (Spec).Display_File),
                           Check_File => False);
                     end if;
                  end if;

               --  For gnatstack, we put the .ci files corresponding to the
               --  different units, including the binder generated files. We
               --  only need to do that for the library units, body or spec,
               --  but not the subunits.

               elsif The_Command = Stack then
                  if Unit.File_Names (Impl) /= null
                    and then not Unit.File_Names (Impl).Locally_Removed
                  then
                     --  There is a body. Check if .ci files for this project
                     --  must be added.

                     if Check_Project
                          (Unit.File_Names (Impl).Project, Project)
                     then
                        Subunit := False;

                        if Unit.File_Names (Spec) = null
                          or else Unit.File_Names (Spec).Locally_Removed
                        then
                           --  We have a body with no spec: we need to check
                           --  if this is a subunit, because .ci files are not
                           --  generated for subunits.

                           declare
                              Src_Ind : constant Source_File_Index :=
                                          Sinput.P.Load_Project_File
                                            (Get_Name_String
                                              (Unit.File_Names
                                                (Impl).Path.Name));
                           begin
                              Subunit :=
                                Sinput.P.Source_File_Is_Subunit (Src_Ind);
                           end;
                        end if;

                        if not Subunit then
                           Add_To_Response_File
                             (Get_Name_String
                                (Unit.File_Names
                                   (Impl).Project. Object_Directory.Name) &
                              MLib.Fil.Ext_To
                                (Get_Name_String
                                   (Unit.File_Names (Impl).Display_File),
                                 "ci"));
                        end if;
                     end if;

                  elsif Unit.File_Names (Spec) /= null
                    and then not Unit.File_Names (Spec).Locally_Removed
                  then
                     --  Spec with no body, check if it is for this project

                     if Check_Project
                          (Unit.File_Names (Spec).Project, Project)
                     then
                        Add_To_Response_File
                          (Get_Name_String
                             (Unit.File_Names
                                (Spec).Project. Object_Directory.Name) &
                           Dir_Separator                               &
                           MLib.Fil.Ext_To
                             (Get_Name_String (Unit.File_Names (Spec).File),
                              "ci"));
                     end if;
                  end if;

               else
                  --  For gnatcheck, gnatsync, gnatpp and gnatmetric, put all
                  --  sources of the project, or of all projects if -U was
                  --  specified.

                  for Kind in Spec_Or_Body loop
                     if Unit.File_Names (Kind) /= null
                       and then Check_Project
                                  (Unit.File_Names (Kind).Project, Project)
                       and then not Unit.File_Names (Kind).Locally_Removed
                     then
                        Add_To_Response_File
                          (""""                                         &
                           Get_Name_String
                             (Unit.File_Names (Kind).Path.Display_Name) &
                           """",
                           Check_File => False);
                     end if;
                  end loop;
               end if;

               Unit := Units_Htable.Get_Next (Project_Tree.Units_HT);
            end loop;
         end;

         if FD /= Invalid_FD then
            Close (FD, Success);

            if not Success then
               Osint.Fail ("disk full");
            end if;
         end if;
      end if;
   end Check_Files;

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

   function Check_Project
     (Project      : Project_Id;
      Root_Project : Project_Id) return Boolean
   is
      Proj : Project_Id;

   begin
      if Project = No_Project then
         return False;

      elsif All_Projects or else Project = Root_Project then
         return True;

      elsif The_Command = Metric then
         Proj := Root_Project;
         while Proj.Extends /= No_Project loop
            if Project = Proj.Extends then
               return True;
            end if;

            Proj := Proj.Extends;
         end loop;
      end if;

      return False;
   end Check_Project;

   -------------------------------
   -- Check_Relative_Executable --
   -------------------------------

   procedure Check_Relative_Executable (Name : in out String_Access) is
      Exec_File_Name : constant String := Name.all;

   begin
      if not Is_Absolute_Path (Exec_File_Name) then
         for Index in Exec_File_Name'Range loop
            if Exec_File_Name (Index) = Directory_Separator then
               Fail ("relative executable (""" &
                       Exec_File_Name &
                       """) with directory part not allowed " &
                       "when using project files");
            end if;
         end loop;

         Get_Name_String (Project.Exec_Directory.Name);

         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 + Exec_File_Name'Length) :=
           Exec_File_Name;
         Name_Len := Name_Len + Exec_File_Name'Length;
         Name := new String'(Name_Buffer (1 .. Name_Len));
      end if;
   end Check_Relative_Executable;

   --------------------------------
   -- Configuration_Pragmas_File --
   --------------------------------

   function Configuration_Pragmas_File return Path_Name_Type is
   begin
      Prj.Env.Create_Config_Pragmas_File (Project, Project_Tree);
      return Project.Config_File_Name;
   end Configuration_Pragmas_File;

   ------------------------------
   -- Delete_Temp_Config_Files --
   ------------------------------

   procedure Delete_Temp_Config_Files is
      Success : Boolean;
      Proj    : Project_List;
      pragma Warnings (Off, Success);

   begin
      --  This should only be called if Keep_Temporary_Files is False

      pragma Assert (not Keep_Temporary_Files);

      if Project /= No_Project then
         Proj := Project_Tree.Projects;
         while Proj /= null loop
            if Proj.Project.Config_File_Temp then
               Delete_Temporary_File
                 (Project_Tree.Shared, Proj.Project.Config_File_Name);
            end if;

            Proj := Proj.Next;
         end loop;
      end if;

      --  If a temporary text file that contains a list of files for a tool
      --  has been created, delete this temporary file.

      if Temp_File_Name /= No_Path then
         Delete_Temporary_File (Project_Tree.Shared, Temp_File_Name);
      end if;
   end Delete_Temp_Config_Files;

   ---------------------------
   -- Ensure_Absolute_Path --
   ---------------------------

   procedure Ensure_Absolute_Path
     (Switch : in out String_Access;
      Parent : String)
   is
   begin
      Makeutl.Ensure_Absolute_Path
        (Switch, Parent,
         Do_Fail              => Osint.Fail'Access,
         Including_Non_Switch => False,
         Including_RTS        => True);
   end Ensure_Absolute_Path;

   -----------------
   -- Get_Closure --
   -----------------

   procedure Get_Closure is
      Args : constant Argument_List :=
               (1 => new String'("-q"),
                2 => new String'("-b"),
                3 => new String'("-P"),
                4 => Project_File,
                5 => ASIS_Main,
                6 => new String'("-bargs"),
                7 => new String'("-R"),
                8 => new String'("-Z"));
      --  Arguments for the invocation of gnatmake which are added to the
      --  Last_Arguments list by this procedure.

      FD : File_Descriptor;
      --  File descriptor for the temp file that will get the output of the
      --  invocation of gnatmake.

      Name : Path_Name_Type;
      --  Path of the file FD

      GN_Name : constant String := Program_Name ("gnatmake", "gnat").all;
      --  Name for gnatmake

      GN_Path : constant String_Access := Locate_Exec_On_Path (GN_Name);
      --  Path of gnatmake

      Return_Code : Integer;

      Unused : Boolean;
      pragma Warnings (Off, Unused);

      File : Ada.Text_IO.File_Type;
      Line : String (1 .. 250);
      Last : Natural;
      --  Used to read file if there is an error, it is good enough to display
      --  just 250 characters if the first line of the file is very long.

      Unit  : Unit_Index;
      Path  : Path_Name_Type;

      Files_File     : Ada.Text_IO.File_Type;
      Temp_File_Name : Path_Name_Type;

   begin
      if GN_Path = null then
         Put_Line (Standard_Error, "could not locate " & GN_Name);
         raise Error_Exit;
      end if;

      --  Create the temp file

      Prj.Env.Create_Temp_File (Project_Tree.Shared, FD, Name, "files");

      --  And close it, because on VMS Spawn with a file descriptor created
      --  with Create_Temp_File does not redirect output.

      Close (FD);

      --  Spawn "gnatmake -q -b -P <project> <main> -bargs -R -Z"

      Spawn
        (Program_Name => GN_Path.all,
         Args         => Args,
         Output_File  => Get_Name_String (Name),
         Success      => Unused,
         Return_Code  => Return_Code,
         Err_To_Out   => True);

      --  Read the output of the invocation of gnatmake

      Open (File, In_File, Get_Name_String (Name));

      --  If it was unsuccessful, display the first line in the file and exit
      --  with error.

      if Return_Code /= 0 then
         Get_Line (File, Line, Last);

         begin
            if not Keep_Temporary_Files then
               Delete (File);
            else
               Close (File);
            end if;

         --  Don't crash if it is not possible to delete or close the file,
         --  just ignore the situation.

         exception
            when others =>
               null;
         end;

         Put_Line (Standard_Error, Line (1 .. Last));
         Put_Line
           (Standard_Error, "could not get closure of " & ASIS_Main.all);
         raise Error_Exit;

      else
         --  Create a temporary file to put the list of files in the closure

         Tempdir.Create_Temp_File (FD, Temp_File_Name);
         Last_Switches.Increment_Last;
         Last_Switches.Table (Last_Switches.Last) :=
           new String'("-files=" & Get_Name_String (Temp_File_Name));

         Close (FD);

         Open (Files_File, Out_File, Get_Name_String (Temp_File_Name));

         --  Get each file name in the file, find its path and add it the list
         --  of arguments.

         while not End_Of_File (File) loop
            Get_Line (File, Line, Last);
            Path := No_Path;

            Unit := Units_Htable.Get_First (Project_Tree.Units_HT);
            while Unit /= No_Unit_Index loop
               if Unit.File_Names (Spec) /= null
                 and then
                   Get_Name_String (Unit.File_Names (Spec).File) =
                      Line (1 .. Last)
               then
                  Path := Unit.File_Names (Spec).Path.Name;
                  exit;

               elsif Unit.File_Names (Impl) /= null
                 and then
                   Get_Name_String (Unit.File_Names (Impl).File) =
                     Line (1 .. Last)
               then
                  Path := Unit.File_Names (Impl).Path.Name;
                  exit;
               end if;

               Unit := Units_Htable.Get_Next (Project_Tree.Units_HT);
            end loop;

            if Path /= No_Path then
               Put_Line (Files_File, Get_Name_String (Path));

            else
               Put_Line (Files_File, Line (1 .. Last));
            end if;
         end loop;

         Close (Files_File);

         begin
            if not Keep_Temporary_Files then
               Delete (File);
            else
               Close (File);
            end if;

         --  Don't crash if it is not possible to delete or close the file,
         --  just ignore the situation.

         exception
            when others =>
               null;
         end;
      end if;
   end Get_Closure;

   ------------------
   -- Mapping_File --
   ------------------

   function Mapping_File return Path_Name_Type is
      Result : Path_Name_Type;
   begin
      Prj.Env.Create_Mapping_File
        (Project  => Project,
         Language => Name_Ada,
         In_Tree  => Project_Tree,
         Name     => Result);
      return Result;
   end Mapping_File;

   -------------------
   -- Non_VMS_Usage --
   -------------------

   procedure Non_VMS_Usage is
   begin
      Output_Version;
      New_Line;
      Put_Line ("List of available commands");
      New_Line;

      for C in Command_List'Range loop

         --  No usage for VMS only command or for Sync

         if not Command_List (C).VMS_Only and then C /= Sync then
            if Targparm.AAMP_On_Target then
               Put ("gnaampcmd ");
            else
               Put ("gnat ");
            end if;

            Put (To_Lower (Command_List (C).Cname.all));
            Set_Col (25);

            --  Never call gnatstack with a prefix

            if C = Stack then
               Put (Command_List (C).Unixcmd.all);
            else
               Put (Program_Name (Command_List (C).Unixcmd.all, "gnat").all);
            end if;

            declare
               Sws : Argument_List_Access renames Command_List (C).Unixsws;
            begin
               if Sws /= null then
                  for J in Sws'Range loop
                     Put (' ');
                     Put (Sws (J).all);
                  end loop;
               end if;
            end;

            New_Line;
         end if;
      end loop;

      New_Line;
      Put_Line ("All commands except chop, krunch and preprocess " &
                "accept project file switches -vPx, -Pprj and -Xnam=val");
      New_Line;
   end Non_VMS_Usage;

   ------------------
   -- Process_Link --
   ------------------

   procedure Process_Link is
      Look_For_Executable : Boolean := True;
      Libraries_Present   : Boolean := False;
      Path_Option         : constant String_Access :=
                              MLib.Linker_Library_Path_Option;
      Prj                 : Project_Id := Project;
      Arg                 : String_Access;
      Last                : Natural := 0;
      Skip_Executable     : Boolean := False;

   begin
      --  Add the default search directories, to be able to find
      --  libgnat in call to MLib.Utl.Lib_Directory.

      Add_Default_Search_Dirs;

      Library_Paths.Set_Last (0);

      --  Check if there are library project files

      if MLib.Tgt.Support_For_Libraries /= None then
         Set_Libraries (Project, Project_Tree, Libraries_Present);
      end if;

      --  If there are, add the necessary additional switches

      if Libraries_Present then

         --  Add -Wl,-rpath,<lib_dir>

         --  If Path_Option is not null, create the switch ("-Wl,-rpath," or
         --  equivalent) with all the library dirs plus the standard GNAT
         --  library dir.

         if Path_Option /= null then
            declare
               Option  : String_Access;
               Length  : Natural := Path_Option'Length;
               Current : Natural;

            begin
               if MLib.Separate_Run_Path_Options then

                  --  We are going to create one switch of the form
                  --  "-Wl,-rpath,dir_N" for each directory to consider.

                  --  One switch for each library directory

                  for Index in
                    Library_Paths.First .. Library_Paths.Last
                  loop
                     Last_Switches.Increment_Last;
                     Last_Switches.Table
                       (Last_Switches.Last) := new String'
                       (Path_Option.all &
                        Last_Switches.Table (Index).all);
                  end loop;

                  --  One switch for the standard GNAT library dir

                  Last_Switches.Increment_Last;
                  Last_Switches.Table
                    (Last_Switches.Last) := new String'
                    (Path_Option.all & MLib.Utl.Lib_Directory);

               else
                  --  First, compute the exact length for the switch

                  for Index in
                    Library_Paths.First .. Library_Paths.Last
                  loop
                     --  Add the length of the library dir plus one for the
                     --  directory separator.

                     Length :=
                       Length +
                         Library_Paths.Table (Index)'Length + 1;
                  end loop;

                  --  Finally, add the length of the standard GNAT library dir

                  Length := Length + MLib.Utl.Lib_Directory'Length;
                  Option := new String (1 .. Length);
                  Option (1 .. Path_Option'Length) := Path_Option.all;
                  Current := Path_Option'Length;

                  --  Put each library dir followed by a dir separator

                  for Index in
                    Library_Paths.First .. Library_Paths.Last
                  loop
                     Option
                       (Current + 1 ..
                          Current +
                            Library_Paths.Table (Index)'Length) :=
                       Library_Paths.Table (Index).all;
                     Current :=
                       Current +
                         Library_Paths.Table (Index)'Length + 1;
                     Option (Current) := Path_Separator;
                  end loop;

                  --  Finally put the standard GNAT library dir

                  Option
                    (Current + 1 ..
                       Current + MLib.Utl.Lib_Directory'Length) :=
                      MLib.Utl.Lib_Directory;

                  --  And add the switch to the last switches

                  Last_Switches.Increment_Last;
                  Last_Switches.Table (Last_Switches.Last) :=
                    Option;
               end if;
            end;
         end if;
      end if;

      --  Check if the first ALI file specified can be found, either in the
      --  object directory of the main project or in an object directory of a
      --  project file extended by the main project. If the ALI file can be
      --  found, replace its name with its absolute path.

      Skip_Executable := False;

      Switch_Loop : for J in 1 .. Last_Switches.Last loop

         --  If we have an executable just reset the flag

         if Skip_Executable then
            Skip_Executable := False;

         --  If -o, set flag so that next switch is not processed

         elsif Last_Switches.Table (J).all = "-o" then
            Skip_Executable := True;

         --  Normal case

         else
            declare
               Switch    : constant String :=
                             Last_Switches.Table (J).all;
               ALI_File  : constant String (1 .. Switch'Length + 4) :=
                             Switch & ".ali";

               Test_Existence : Boolean := False;

            begin
               Last := Switch'Length;

               --  Skip real switches

               if Switch'Length /= 0
                 and then Switch (Switch'First) /= '-'
               then
                  --  Append ".ali" if file name does not end with it

                  if Switch'Length <= 4
                    or else Switch (Switch'Last - 3 .. Switch'Last) /= ".ali"
                  then
                     Last := ALI_File'Last;
                  end if;

                  --  If file name includes directory information, stop if ALI
                  --  file exists.

                  if Is_Absolute_Path (ALI_File (1 .. Last)) then
                     Test_Existence := True;

                  else
                     for K in Switch'Range loop
                        if Switch (K) = '/'
                          or else Switch (K) = Directory_Separator
                        then
                           Test_Existence := True;
                           exit;
                        end if;
                     end loop;
                  end if;

                  if Test_Existence then
                     if Is_Regular_File (ALI_File (1 .. Last)) then
                        exit Switch_Loop;
                     end if;

                  --  Look in object directories if ALI file exists

                  else
                     Project_Loop : loop
                        declare
                           Dir : constant String :=
                                   Get_Name_String (Prj.Object_Directory.Name);
                        begin
                           if Is_Regular_File
                                (Dir &
                                 ALI_File (1 .. Last))
                           then
                              --  We have found the correct project, so we
                              --  replace the file with the absolute path.

                              Last_Switches.Table (J) :=
                                new String'(Dir & ALI_File (1 .. Last));

                              --  And we are done

                              exit Switch_Loop;
                           end if;
                        end;

                        --  Go to the project being extended, if any

                        Prj := Prj.Extends;
                        exit Project_Loop when Prj = No_Project;
                     end loop Project_Loop;
                  end if;
               end if;
            end;
         end if;
      end loop Switch_Loop;

      --  If a relative path output file has been specified, we add the exec
      --  directory.

      for J in reverse 1 .. Last_Switches.Last - 1 loop
         if Last_Switches.Table (J).all = "-o" then
            Check_Relative_Executable
              (Name => Last_Switches.Table (J + 1));
            Look_For_Executable := False;
            exit;
         end if;
      end loop;

      if Look_For_Executable then
         for J in reverse 1 .. First_Switches.Last - 1 loop
            if First_Switches.Table (J).all = "-o" then
               Look_For_Executable := False;
               Check_Relative_Executable
                 (Name => First_Switches.Table (J + 1));
               exit;
            end if;
         end loop;
      end if;

      --  If no executable is specified, then find the name of the first ALI
      --  file on the command line and issue a -o switch with the absolute path
      --  of the executable in the exec directory.

      if Look_For_Executable then
         for J in 1 .. Last_Switches.Last loop
            Arg  := Last_Switches.Table (J);
            Last := 0;

            if Arg'Length /= 0 and then Arg (Arg'First) /= '-' then
               if Arg'Length > 4
                 and then Arg (Arg'Last - 3 .. Arg'Last) = ".ali"
               then
                  Last := Arg'Last - 4;

               elsif Is_Regular_File (Arg.all & ".ali") then
                  Last := Arg'Last;
               end if;

               if Last /= 0 then
                  Last_Switches.Increment_Last;
                  Last_Switches.Table (Last_Switches.Last) :=
                    new String'("-o");
                  Get_Name_String (Project.Exec_Directory.Name);
                  Last_Switches.Increment_Last;
                  Last_Switches.Table (Last_Switches.Last) :=
                    new String'(Name_Buffer (1 .. Name_Len) &
                                Executable_Name
                                  (Base_Name (Arg (Arg'First .. Last))));
                  exit;
               end if;
            end if;
         end loop;
      end if;
   end Process_Link;

   ---------------------
   -- Set_Library_For --
   ---------------------

   procedure Set_Library_For
     (Project           : Project_Id;
      Tree              : Project_Tree_Ref;
      Libraries_Present : in out Boolean)
   is
      pragma Unreferenced (Tree);

      Path_Option : constant String_Access :=
                      MLib.Linker_Library_Path_Option;

   begin
      --  Case of library project

      if Project.Library then
         Libraries_Present := True;

         --  Add the -L switch

         Last_Switches.Increment_Last;
         Last_Switches.Table (Last_Switches.Last) :=
           new String'("-L" & Get_Name_String (Project.Library_Dir.Name));

         --  Add the -l switch

         Last_Switches.Increment_Last;
         Last_Switches.Table (Last_Switches.Last) :=
           new String'("-l" & Get_Name_String (Project.Library_Name));

         --  Add the directory to table Library_Paths, to be processed later
         --  if library is not static and if Path_Option is not null.

         if Project.Library_Kind /= Static
           and then Path_Option /= null
         then
            Library_Paths.Increment_Last;
            Library_Paths.Table (Library_Paths.Last) :=
              new String'(Get_Name_String (Project.Library_Dir.Name));
         end if;
      end if;
   end Set_Library_For;

   procedure Check_Version_And_Help is
     new Check_Version_And_Help_G (Non_VMS_Usage);

--  Start of processing for GNATCmd

begin
   --  All output from GNATCmd is debugging or error output: send to stderr

   Set_Standard_Error;

   --  Initializations

   Csets.Initialize;
   Snames.Initialize;
   Stringt.Initialize;

   Prj.Tree.Initialize (Root_Environment, Gnatmake_Flags);

   Project_Node_Tree := new Project_Node_Tree_Data;
   Prj.Tree.Initialize (Project_Node_Tree);

   Prj.Initialize (Project_Tree);

   Last_Switches.Init;
   Last_Switches.Set_Last (0);

   First_Switches.Init;
   First_Switches.Set_Last (0);
   Carg_Switches.Init;
   Carg_Switches.Set_Last (0);
   Rules_Switches.Init;
   Rules_Switches.Set_Last (0);

   VMS_Conv.Initialize;

   --  Add the default search directories, to be able to find system.ads in the
   --  subsequent call to Targparm.Get_Target_Parameters.

   Add_Default_Search_Dirs;

   --  Get target parameters so that AAMP_On_Target will be set, for testing in
   --  Osint.Program_Name to handle the mapping of GNAAMP tool names.

   Targparm.Get_Target_Parameters;

   --  Put the command line in environment variable GNAT_DRIVER_COMMAND_LINE,
   --  so that the spawned tool may know the way the GNAT driver was invoked.

   Name_Len := 0;
   Add_Str_To_Name_Buffer (Command_Name);

   for J in 1 .. Argument_Count loop
      Add_Char_To_Name_Buffer (' ');
      Add_Str_To_Name_Buffer (Argument (J));
   end loop;

   --  On OpenVMS, setenv creates a logical whose length is limited to
   --  255 bytes.

   if OpenVMS and then Name_Len > Max_OpenVMS_Logical_Length then
      Name_Buffer (Max_OpenVMS_Logical_Length - 2
                     .. Max_OpenVMS_Logical_Length) := "...";
      Name_Len := Max_OpenVMS_Logical_Length;
   end if;

   Setenv ("GNAT_DRIVER_COMMAND_LINE", Name_Buffer (1 .. Name_Len));

   --  Add the directory where the GNAT driver is invoked in front of the path,
   --  if the GNAT driver is invoked with directory information. Do not do this
   --  for VMS, where the notion of path does not really exist.

   if not OpenVMS then
      declare
         Command : constant String := Command_Name;

      begin
         for Index in reverse Command'Range loop
            if Command (Index) = Directory_Separator then
               declare
                  Absolute_Dir : constant String :=
                                   Normalize_Pathname
                                     (Command (Command'First .. Index));

                  PATH : constant String :=
                           Absolute_Dir & Path_Separator & Getenv ("PATH").all;

               begin
                  Setenv ("PATH", PATH);
               end;

               exit;
            end if;
         end loop;
      end;
   end if;

   --  If on VMS, or if VMS emulation is on, convert VMS style /qualifiers,
   --  filenames and pathnames to Unix style.

   if Hostparm.OpenVMS
     or else To_Lower (Getenv ("EMULATE_VMS").all) = "true"
   then
      VMS_Conversion (The_Command);

      B_Start := new String'("b__");

   --  If not on VMS, scan the command line directly

   else
      --  First, scan to detect --version and/or --help

      Check_Version_And_Help ("GNAT", "1996");

      begin
         loop
            if Command_Arg <= Argument_Count
              and then Argument (Command_Arg) = "-v"
            then
               Verbose_Mode := True;
               Command_Arg := Command_Arg + 1;

            elsif Command_Arg <= Argument_Count
              and then Argument (Command_Arg) = "-dn"
            then
               Keep_Temporary_Files := True;
               Command_Arg := Command_Arg + 1;

            else
               exit;
            end if;
         end loop;

         --  If there is no command, just output the usage

         if Command_Arg > Argument_Count then
            Non_VMS_Usage;
            return;
         end if;

         The_Command := Real_Command_Type'Value (Argument (Command_Arg));

         if Command_List (The_Command).VMS_Only then
            Non_VMS_Usage;
            Fail
              ("command """
               & Command_List (The_Command).Cname.all
               & """ can only be used on VMS");
         end if;

      exception
         when Constraint_Error =>

            --  Check if it is an alternate command

            declare
               Alternate : Alternate_Command;

            begin
               Alternate := Alternate_Command'Value
                              (Argument (Command_Arg));
               The_Command := Corresponding_To (Alternate);

            exception
               when Constraint_Error =>
                  Non_VMS_Usage;
                  Fail ("unknown command: " & Argument (Command_Arg));
            end;
      end;

      --  Get the arguments from the command line and from the eventual
      --  argument file(s) specified on the command line.

      for Arg in Command_Arg + 1 .. Argument_Count loop
         declare
            The_Arg : constant String := Argument (Arg);

         begin
            --  Check if an argument file is specified

            if The_Arg (The_Arg'First) = '@' then
               declare
                  Arg_File : Ada.Text_IO.File_Type;
                  Line     : String (1 .. 256);
                  Last     : Natural;

               begin
                  --  Open the file and fail if the file cannot be found

                  begin
                     Open
                       (Arg_File, In_File,
                        The_Arg (The_Arg'First + 1 .. The_Arg'Last));

                  exception
                     when others =>
                        Put (Standard_Error, "Cannot open argument file """);
                        Put (Standard_Error,
                             The_Arg (The_Arg'First + 1 .. The_Arg'Last));
                        Put_Line (Standard_Error, """");
                        raise Error_Exit;
                  end;

                  --  Read line by line and put the content of each non-
                  --  empty line in the Last_Switches table.

                  while not End_Of_File (Arg_File) loop
                     Get_Line (Arg_File, Line, Last);

                     if Last /= 0 then
                        Last_Switches.Increment_Last;
                        Last_Switches.Table (Last_Switches.Last) :=
                          new String'(Line (1 .. Last));
                     end if;
                  end loop;

                  Close (Arg_File);
               end;

            else
               --  It is not an argument file; just put the argument in
               --  the Last_Switches table.

               Last_Switches.Increment_Last;
               Last_Switches.Table (Last_Switches.Last) :=
                 new String'(The_Arg);
            end if;
         end;
      end loop;
   end if;

   declare
      Program   : String_Access;
      Exec_Path : String_Access;

   begin
      if The_Command = Stack then

         --  Never call gnatstack with a prefix

         Program := new String'(Command_List (The_Command).Unixcmd.all);

      else
         Program :=
           Program_Name (Command_List (The_Command).Unixcmd.all, "gnat");
      end if;

      --  For the tools where the GNAT driver processes the project files,
      --  allow shared library projects to import projects that are not shared
      --  library projects, to avoid adding a switch for these tools. For the
      --  builder (gnatmake), if a shared library project imports a project
      --  that is not a shared library project and the appropriate switch is
      --  not specified, the invocation of gnatmake will fail.

      Opt.Unchecked_Shared_Lib_Imports := True;

      --  Locate the executable for the command

      Exec_Path := Locate_Exec_On_Path (Program.all);

      if Exec_Path = null then
         Put_Line (Standard_Error, "could not locate " & Program.all);
         raise Error_Exit;
      end if;

      --  If there are switches for the executable, put them as first switches

      if Command_List (The_Command).Unixsws /= null then
         for J in Command_List (The_Command).Unixsws'Range loop
            First_Switches.Increment_Last;
            First_Switches.Table (First_Switches.Last) :=
              Command_List (The_Command).Unixsws (J);
         end loop;
      end if;

      --  For BIND, CHECK, ELIM, FIND, LINK, LIST, METRIC, PRETTY, STACK, STUB,
      --  SYNC and XREF, look for project file related switches.

      case The_Command is
         when Bind =>
            Tool_Package_Name := Name_Binder;
            Packages_To_Check := Packages_To_Check_By_Binder;
         when Check =>
            Tool_Package_Name := Name_Check;
            Packages_To_Check := Packages_To_Check_By_Check;
         when Elim =>
            Tool_Package_Name := Name_Eliminate;
            Packages_To_Check := Packages_To_Check_By_Eliminate;
         when Find =>
            Tool_Package_Name := Name_Finder;
            Packages_To_Check := Packages_To_Check_By_Finder;
         when Link =>
            Tool_Package_Name := Name_Linker;
            Packages_To_Check := Packages_To_Check_By_Linker;
         when List =>
            Tool_Package_Name := Name_Gnatls;
            Packages_To_Check := Packages_To_Check_By_Gnatls;
         when Metric =>
            Tool_Package_Name := Name_Metrics;
            Packages_To_Check := Packages_To_Check_By_Metric;
         when Pretty =>
            Tool_Package_Name := Name_Pretty_Printer;
            Packages_To_Check := Packages_To_Check_By_Pretty;
         when Stack =>
            Tool_Package_Name := Name_Stack;
            Packages_To_Check := Packages_To_Check_By_Stack;
         when Stub =>
            Tool_Package_Name := Name_Gnatstub;
            Packages_To_Check := Packages_To_Check_By_Gnatstub;
         when Sync =>
            Tool_Package_Name := Name_Synchronize;
            Packages_To_Check := Packages_To_Check_By_Sync;
         when Xref =>
            Tool_Package_Name := Name_Cross_Reference;
            Packages_To_Check := Packages_To_Check_By_Xref;
         when others =>
            Tool_Package_Name := No_Name;
      end case;

      if Tool_Package_Name /= No_Name then

         --  Check that the switches are consistent. Detect project file
         --  related switches.

         Inspect_Switches : declare
            Arg_Num : Positive := 1;
            Argv    : String_Access;

            procedure Remove_Switch (Num : Positive);
            --  Remove a project related switch from table Last_Switches

            -------------------
            -- Remove_Switch --
            -------------------

            procedure Remove_Switch (Num : Positive) is
            begin
               Last_Switches.Table (Num .. Last_Switches.Last - 1) :=
                 Last_Switches.Table (Num + 1 .. Last_Switches.Last);
               Last_Switches.Decrement_Last;
            end Remove_Switch;

         --  Start of processing for Inspect_Switches

         begin
            while Arg_Num <= Last_Switches.Last loop
               Argv := Last_Switches.Table (Arg_Num);

               if Argv (Argv'First) = '-' then
                  if Argv'Length = 1 then
                     Fail
                       ("switch character cannot be followed by a blank");
                  end if;

                  --  The two style project files (-p and -P) cannot be used
                  --  together

                  if (The_Command = Find or else The_Command = Xref)
                    and then Argv (2) = 'p'
                  then
                     Old_Project_File_Used := True;
                     if Project_File /= null then
                        Fail ("-P and -p cannot be used together");
                     end if;
                  end if;

                  --  --subdirs=... Specify Subdirs

                  if Argv'Length > Makeutl.Subdirs_Option'Length
                    and then
                      Argv
                       (Argv'First ..
                        Argv'First + Makeutl.Subdirs_Option'Length - 1) =
                          Makeutl.Subdirs_Option
                  then
                     Subdirs :=
                       new String'
                         (Argv
                           (Argv'First + Makeutl.Subdirs_Option'Length ..
                            Argv'Last));

                     Remove_Switch (Arg_Num);

                  --  -aPdir  Add dir to the project search path

                  elsif Argv'Length > 3
                    and then Argv (Argv'First + 1 .. Argv'First + 2) = "aP"
                  then
                     Prj.Env.Add_Directories
                       (Root_Environment.Project_Path,
                        Argv (Argv'First + 3 .. Argv'Last));

                     --  Pass -aPdir to gnatls, but not to other tools

                     if The_Command = List then
                        Arg_Num := Arg_Num + 1;
                     else
                        Remove_Switch (Arg_Num);
                     end if;

                  --  -eL  Follow links for files

                  elsif Argv.all = "-eL" then
                     Follow_Links_For_Files := True;
                     Follow_Links_For_Dirs  := True;

                     Remove_Switch (Arg_Num);

                  --  -vPx  Specify verbosity while parsing project files

                  elsif Argv'Length >= 3
                    and then  Argv (Argv'First + 1 .. Argv'First + 2) = "vP"
                  then
                     if Argv'Length = 4
                          and then Argv (Argv'Last) in '0' .. '2'
                     then
                        case Argv (Argv'Last) is
                           when '0' =>
                              Current_Verbosity := Prj.Default;
                           when '1' =>
                              Current_Verbosity := Prj.Medium;
                           when '2' =>
                              Current_Verbosity := Prj.High;
                           when others =>

                              --  Cannot happen

                              raise Program_Error;
                        end case;
                     else
                        Fail ("invalid verbosity level: "
                              & Argv (Argv'First + 3 .. Argv'Last));
                     end if;

                     Remove_Switch (Arg_Num);

                  --  -Pproject_file  Specify project file to be used

                  elsif Argv (Argv'First + 1) = 'P' then

                     --  Only one -P switch can be used

                     if Project_File /= null then
                        Fail
                          (Argv.all
                           & ": second project file forbidden (first is """
                           & Project_File.all
                           & """)");

                     --  The two style project files (-p and -P) cannot be
                     --  used together.

                     elsif Old_Project_File_Used then
                        Fail ("-p and -P cannot be used together");

                     elsif Argv'Length = 2 then

                        --  There is space between -P and the project file
                        --  name. -P cannot be the last option.

                        if Arg_Num = Last_Switches.Last then
                           Fail ("project file name missing after -P");

                        else
                           Remove_Switch (Arg_Num);
                           Argv := Last_Switches.Table (Arg_Num);

                           --  After -P, there must be a project file name,
                           --  not another switch.

                           if Argv (Argv'First) = '-' then
                              Fail ("project file name missing after -P");

                           else
                              Project_File := new String'(Argv.all);
                           end if;
                        end if;

                     else
                        --  No space between -P and project file name

                        Project_File :=
                          new String'(Argv (Argv'First + 2 .. Argv'Last));
                     end if;

                     Remove_Switch (Arg_Num);

                  --  -Xexternal=value Specify an external reference to be
                  --                   used in project files

                  elsif Argv'Length >= 5
                    and then Argv (Argv'First + 1) = 'X'
                  then
                     if not Check (Root_Environment.External,
                                    Argv (Argv'First + 2 .. Argv'Last))
                     then
                        Fail (Argv.all
                              & " is not a valid external assignment.");
                     end if;

                     Remove_Switch (Arg_Num);

                  elsif
                    (The_Command = Check  or else
                     The_Command = Sync   or else
                     The_Command = Pretty or else
                     The_Command = Metric or else
                     The_Command = Stack  or else
                     The_Command = List)
                    and then Argv'Length = 2
                    and then Argv (2) = 'U'
                  then
                     All_Projects := True;
                     Remove_Switch (Arg_Num);

                  else
                     Arg_Num := Arg_Num + 1;
                  end if;

               elsif ((The_Command = Check and then Argv (Argv'First) /= '+')
                        or else The_Command = Sync
                        or else The_Command = Metric
                        or else The_Command = Pretty)
                 and then Project_File /= null
                 and then All_Projects
               then
                  if ASIS_Main /= null then
                     Fail ("cannot specify more than one main after -U");
                  else
                     ASIS_Main := Argv;
                     Remove_Switch (Arg_Num);
                  end if;

               else
                  Arg_Num := Arg_Num + 1;
               end if;
            end loop;
         end Inspect_Switches;
      end if;

      --  Add the default project search directories now, after the directories
      --  that have been specified by switches -aP<dir>.

      Prj.Env.Initialize_Default_Project_Path
        (Root_Environment.Project_Path,
         Target_Name => Sdefault.Target_Name.all);

      --  If there is a project file specified, parse it, get the switches
      --  for the tool and setup PATH environment variables.

      if Project_File /= null then
         Prj.Pars.Set_Verbosity (To => Current_Verbosity);

         Prj.Pars.Parse
           (Project           => Project,
            In_Tree           => Project_Tree,
            In_Node_Tree      => Project_Node_Tree,
            Project_File_Name => Project_File.all,
            Env               => Root_Environment,
            Packages_To_Check => Packages_To_Check);

         --  Prj.Pars.Parse calls Set_Standard_Output, reset to stderr

         Set_Standard_Error;

         if Project = Prj.No_Project then
            Fail ("""" & Project_File.all & """ processing failed");

         elsif Project.Qualifier = Aggregate then
            Fail ("aggregate projects are not supported");

         elsif Aggregate_Libraries_In (Project_Tree) then
            Fail ("aggregate library projects are not supported");
         end if;

         --  Check if a package with the name of the tool is in the project
         --  file and if there is one, get the switches, if any, and scan them.

         declare
            Pkg : constant Prj.Package_Id :=
                    Prj.Util.Value_Of
                      (Name        => Tool_Package_Name,
                       In_Packages => Project.Decl.Packages,
                       Shared      => Project_Tree.Shared);

            Element : Package_Element;

            Switches_Array : Array_Element_Id;

            The_Switches : Prj.Variable_Value;
            Current      : Prj.String_List_Id;
            The_String   : String_Element;

            Main : String_Access := null;

         begin
            if Pkg /= No_Package then
               Element := Project_Tree.Shared.Packages.Table (Pkg);

               --  Packages Gnatls and Gnatstack have a single attribute
               --  Switches, that is not an associative array.

               if The_Command = List or else The_Command = Stack then
                  The_Switches :=
                    Prj.Util.Value_Of
                    (Variable_Name => Snames.Name_Switches,
                     In_Variables  => Element.Decl.Attributes,
                     Shared        => Project_Tree.Shared);

               --  Packages Binder (for gnatbind), Cross_Reference (for
               --  gnatxref), Linker (for gnatlink), Finder (for gnatfind),
               --  Pretty_Printer (for gnatpp), Eliminate (for gnatelim), Check
               --  (for gnatcheck), and Metric (for gnatmetric) have an
               --  attributed Switches, an associative array, indexed by the
               --  name of the file.

               --  They also have an attribute Default_Switches, indexed by the
               --  name of the programming language.

               else
                  --  First check if there is a single main

                  for J in 1 .. Last_Switches.Last loop
                     if Last_Switches.Table (J) (1) /= '-' then
                        if Main = null then
                           Main := Last_Switches.Table (J);

                        else
                           Main := null;
                           exit;
                        end if;
                     end if;
                  end loop;

                  if Main /= null then
                     Switches_Array :=
                       Prj.Util.Value_Of
                         (Name      => Name_Switches,
                          In_Arrays => Element.Decl.Arrays,
                          Shared    => Project_Tree.Shared);
                     Name_Len := 0;

                     --  If the single main has been specified as an absolute
                     --  path, use only the simple file name. If the absolute
                     --  path is incorrect, an error will be reported by the
                     --  underlying tool and it does not make a difference
                     --  what switches are used.

                     if Is_Absolute_Path (Main.all) then
                        Add_Str_To_Name_Buffer (File_Name (Main.all));
                     else
                        Add_Str_To_Name_Buffer (Main.all);
                     end if;

                     The_Switches := Prj.Util.Value_Of
                       (Index     => Name_Find,
                        Src_Index => 0,
                        In_Array  => Switches_Array,
                        Shared    => Project_Tree.Shared);
                  end if;

                  if The_Switches.Kind = Prj.Undefined then
                     Switches_Array :=
                       Prj.Util.Value_Of
                         (Name      => Name_Default_Switches,
                          In_Arrays => Element.Decl.Arrays,
                          Shared    => Project_Tree.Shared);
                     The_Switches := Prj.Util.Value_Of
                       (Index     => Name_Ada,
                        Src_Index => 0,
                        In_Array  => Switches_Array,
                        Shared    => Project_Tree.Shared);
                  end if;
               end if;

               --  If there are switches specified in the package of the
               --  project file corresponding to the tool, scan them.

               case The_Switches.Kind is
                  when Prj.Undefined =>
                     null;

                  when Prj.Single =>
                     declare
                        Switch : constant String :=
                                   Get_Name_String (The_Switches.Value);

                     begin
                        if Switch'Length > 0 then
                           First_Switches.Increment_Last;
                           First_Switches.Table (First_Switches.Last) :=
                             new String'(Switch);
                        end if;
                     end;

                  when Prj.List =>
                     Current := The_Switches.Values;
                     while Current /= Prj.Nil_String loop
                        The_String := Project_Tree.Shared.String_Elements.
                                        Table (Current);

                        declare
                           Switch : constant String :=
                             Get_Name_String (The_String.Value);

                        begin
                           if Switch'Length > 0 then
                              First_Switches.Increment_Last;
                              First_Switches.Table (First_Switches.Last) :=
                                new String'(Switch);
                           end if;
                        end;

                        Current := The_String.Next;
                     end loop;
               end case;
            end if;
         end;

         if The_Command = Bind or else
            The_Command = Link or else
            The_Command = Elim
         then
            if Project.Object_Directory.Name = No_Path then
               Fail ("project " & Get_Name_String (Project.Display_Name)
                     & " has no object directory");
            end if;

            Change_Dir (Get_Name_String (Project.Object_Directory.Name));
         end if;

         --  Set up the env vars for project path files

         Prj.Env.Set_Ada_Paths
           (Project, Project_Tree, Including_Libraries => True);

         --  For gnatcheck, gnatstub, gnatmetric, gnatpp and gnatelim, create
         --  a configuration pragmas file, if necessary.

         if        The_Command = Pretty
           or else The_Command = Metric
           or else The_Command = Stub
           or else The_Command = Elim
           or else The_Command = Check
           or else The_Command = Sync
         then
            --  If there are switches in package Compiler, put them in the
            --  Carg_Switches table.

            declare
               Pkg  : constant Prj.Package_Id :=
                        Prj.Util.Value_Of
                          (Name        => Name_Compiler,
                           In_Packages => Project.Decl.Packages,
                           Shared      => Project_Tree.Shared);

               Element : Package_Element;

               Switches_Array : Array_Element_Id;

               The_Switches : Prj.Variable_Value;
               Current      : Prj.String_List_Id;
               The_String   : String_Element;

               Main    : String_Access := null;
               Main_Id : Name_Id;

            begin
               if Pkg /= No_Package then

                  --  First, check if there is a single main specified

                  for J in 1  .. Last_Switches.Last loop
                     if Last_Switches.Table (J) (1) /= '-' then
                        if Main = null then
                           Main := Last_Switches.Table (J);

                        else
                           Main := null;
                           exit;
                        end if;
                     end if;
                  end loop;

                  Element := Project_Tree.Shared.Packages.Table (Pkg);

                  --  If there is a single main and there is compilation
                  --  switches specified in the project file, use them.

                  if Main /= null and then not All_Projects then
                     Name_Len := Main'Length;
                     Name_Buffer (1 .. Name_Len) := Main.all;
                     Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
                     Main_Id := Name_Find;

                     Switches_Array :=
                       Prj.Util.Value_Of
                         (Name      => Name_Switches,
                          In_Arrays => Element.Decl.Arrays,
                          Shared    => Project_Tree.Shared);
                     The_Switches := Prj.Util.Value_Of
                       (Index     => Main_Id,
                        Src_Index => 0,
                        In_Array  => Switches_Array,
                        Shared    => Project_Tree.Shared);
                  end if;

                  --  Otherwise, get the Default_Switches ("Ada")

                  if The_Switches.Kind = Undefined then
                     Switches_Array :=
                       Prj.Util.Value_Of
                         (Name      => Name_Default_Switches,
                          In_Arrays => Element.Decl.Arrays,
                          Shared    => Project_Tree.Shared);
                     The_Switches := Prj.Util.Value_Of
                       (Index     => Name_Ada,
                        Src_Index => 0,
                        In_Array  => Switches_Array,
                        Shared    => Project_Tree.Shared);
                  end if;

                  --  If there are switches specified, put them in the
                  --  Carg_Switches table.

                  case The_Switches.Kind is
                     when Prj.Undefined =>
                        null;

                     when Prj.Single =>
                        declare
                           Switch : constant String :=
                                      Get_Name_String (The_Switches.Value);
                        begin
                           if Switch'Length > 0 then
                              Add_To_Carg_Switches (new String'(Switch));
                           end if;
                        end;

                     when Prj.List =>
                        Current := The_Switches.Values;
                        while Current /= Prj.Nil_String loop
                           The_String := Project_Tree.Shared.String_Elements
                             .Table (Current);

                           declare
                              Switch : constant String :=
                                         Get_Name_String (The_String.Value);
                           begin
                              if Switch'Length > 0 then
                                 Add_To_Carg_Switches (new String'(Switch));
                              end if;
                           end;

                           Current := The_String.Next;
                        end loop;
                  end case;
               end if;
            end;

            --  If -cargs is one of the switches, move the following switches
            --  to the Carg_Switches table.

            for J in 1 .. First_Switches.Last loop
               if First_Switches.Table (J).all = "-cargs" then
                  declare
                     K    : Positive;
                     Last : Natural;

                  begin
                     --  Move the switches that are before -rules when the
                     --  command is CHECK.

                     K := J + 1;
                     while K <= First_Switches.Last
                       and then
                        (The_Command /= Check
                          or else First_Switches.Table (K).all /= "-rules")
                     loop
                        Add_To_Carg_Switches (First_Switches.Table (K));
                        K := K + 1;
                     end loop;

                     if K > First_Switches.Last then
                        First_Switches.Set_Last (J - 1);

                     else
                        Last := J - 1;
                        while K <= First_Switches.Last loop
                           Last := Last + 1;
                           First_Switches.Table (Last) :=
                             First_Switches.Table (K);
                           K := K + 1;
                        end loop;

                        First_Switches.Set_Last (Last);
                     end if;
                  end;

                  exit;
               end if;
            end loop;

            for J in 1 .. Last_Switches.Last loop
               if Last_Switches.Table (J).all = "-cargs" then
                  declare
                     K    : Positive;
                     Last : Natural;

                  begin
                     --  Move the switches that are before -rules when the
                     --  command is CHECK.

                     K := J + 1;
                     while K <= Last_Switches.Last
                       and then
                        (The_Command /= Check
                          or else Last_Switches.Table (K).all /= "-rules")
                     loop
                        Add_To_Carg_Switches (Last_Switches.Table (K));
                        K := K + 1;
                     end loop;

                     if K > Last_Switches.Last then
                        Last_Switches.Set_Last (J - 1);

                     else
                        Last := J - 1;
                        while K <= Last_Switches.Last loop
                           Last := Last + 1;
                           Last_Switches.Table (Last) :=
                             Last_Switches.Table (K);
                           K := K + 1;
                        end loop;

                        Last_Switches.Set_Last (Last);
                     end if;
                  end;

                  exit;
               end if;
            end loop;

            declare
               CP_File : constant Path_Name_Type := Configuration_Pragmas_File;
               M_File  : constant Path_Name_Type := Mapping_File;

            begin
               if CP_File /= No_Path then
                  if The_Command = Elim then
                     First_Switches.Increment_Last;
                     First_Switches.Table (First_Switches.Last)  :=
                       new String'("-C" & Get_Name_String (CP_File));

                  else
                     Add_To_Carg_Switches
                       (new String'("-gnatec=" & Get_Name_String (CP_File)));
                  end if;
               end if;

               if M_File /= No_Path then
                  Add_To_Carg_Switches
                    (new String'("-gnatem=" & Get_Name_String (M_File)));
               end if;

               --  For gnatcheck, gnatpp, gnatstub and gnatmetric, also
               --  indicate a global configuration pragmas file and, if -U
               --  is not used, a local one.

               if The_Command = Check  or else
                  The_Command = Pretty or else
                  The_Command = Stub   or else
                  The_Command = Metric
               then
                  declare
                     Pkg  : constant Prj.Package_Id :=
                              Prj.Util.Value_Of
                                (Name        => Name_Builder,
                                 In_Packages => Project.Decl.Packages,
                                 Shared      => Project_Tree.Shared);

                     Variable : Variable_Value :=
                                  Prj.Util.Value_Of
                                    (Name                    => No_Name,
                                     Attribute_Or_Array_Name =>
                                       Name_Global_Configuration_Pragmas,
                                     In_Package              => Pkg,
                                     Shared            => Project_Tree.Shared);

                  begin
                     if (Variable = Nil_Variable_Value
                          or else Length_Of_Name (Variable.Value) = 0)
                       and then Pkg /= No_Package
                     then
                        Variable :=
                          Prj.Util.Value_Of
                            (Name                    => Name_Ada,
                             Attribute_Or_Array_Name =>
                               Name_Global_Config_File,
                             In_Package              => Pkg,
                             Shared                  => Project_Tree.Shared);
                     end if;

                     if Variable /= Nil_Variable_Value
                       and then Length_Of_Name (Variable.Value) /= 0
                     then
                        declare
                           Path : constant String :=
                                    Absolute_Path
                                      (Path_Name_Type (Variable.Value),
                                       Variable.Project);
                        begin
                           Add_To_Carg_Switches
                             (new String'("-gnatec=" & Path));
                        end;
                     end if;
                  end;

                  if not All_Projects then
                     declare
                        Pkg : constant Prj.Package_Id :=
                                Prj.Util.Value_Of
                                  (Name        => Name_Compiler,
                                   In_Packages => Project.Decl.Packages,
                                   Shared      => Project_Tree.Shared);

                        Variable : Variable_Value :=
                                     Prj.Util.Value_Of
                                       (Name        => No_Name,
                                        Attribute_Or_Array_Name =>
                                          Name_Local_Configuration_Pragmas,
                                        In_Package  => Pkg,
                                        Shared      => Project_Tree.Shared);

                     begin
                        if (Variable = Nil_Variable_Value
                             or else Length_Of_Name (Variable.Value) = 0)
                          and then Pkg /= No_Package
                        then
                           Variable :=
                             Prj.Util.Value_Of
                               (Name                    => Name_Ada,
                                Attribute_Or_Array_Name =>
                                  Name_Local_Config_File,
                                In_Package              => Pkg,
                                Shared                  =>
                                  Project_Tree.Shared);
                        end if;

                        if Variable /= Nil_Variable_Value
                          and then Length_Of_Name (Variable.Value) /= 0
                        then
                           declare
                              Path : constant String :=
                                       Absolute_Path
                                         (Path_Name_Type (Variable.Value),
                                          Variable.Project);
                           begin
                              Add_To_Carg_Switches
                                (new String'("-gnatec=" & Path));
                           end;
                        end if;
                     end;
                  end if;
               end if;
            end;
         end if;

         if The_Command = Link then
            Process_Link;
         end if;

         if The_Command = Link or else The_Command = Bind then

            --  For files that are specified as relative paths with directory
            --  information, we convert them to absolute paths, with parent
            --  being the current working directory if specified on the command
            --  line and the project directory if specified in the project
            --  file. This is what gnatmake is doing for linker and binder
            --  arguments.

            for J in 1 .. Last_Switches.Last loop
               GNATCmd.Ensure_Absolute_Path
                 (Last_Switches.Table (J), Current_Work_Dir);
            end loop;

            Get_Name_String (Project.Directory.Name);

            declare
               Project_Dir : constant String := Name_Buffer (1 .. Name_Len);
            begin
               for J in 1 .. First_Switches.Last loop
                  GNATCmd.Ensure_Absolute_Path
                    (First_Switches.Table (J), Project_Dir);
               end loop;
            end;

         elsif The_Command = Stub then
            declare
               File_Index : Integer := 0;
               Dir_Index  : Integer := 0;
               Last       : constant Integer := Last_Switches.Last;
               Lang       : constant Language_Ptr :=
                              Get_Language_From_Name (Project, "ada");

            begin
               for Index in 1 .. Last loop
                  if Last_Switches.Table (Index)
                    (Last_Switches.Table (Index)'First) /= '-'
                  then
                     File_Index := Index;
                     exit;
                  end if;
               end loop;

               --  If the project file naming scheme is not standard, and if
               --  the file name ends with the spec suffix, then indicate to
               --  gnatstub the name of the body file with a -o switch.

               if Lang /= No_Language_Index
                 and then not Is_Standard_GNAT_Naming (Lang.Config.Naming_Data)
               then
                  if File_Index /= 0 then
                     declare
                        Spec : constant String :=
                                 Base_Name
                                   (Last_Switches.Table (File_Index).all);
                        Last : Natural := Spec'Last;

                     begin
                        Get_Name_String (Lang.Config.Naming_Data.Spec_Suffix);

                        if Spec'Length > Name_Len
                          and then Spec (Last - Name_Len + 1 .. Last) =
                                                  Name_Buffer (1 .. Name_Len)
                        then
                           Last := Last - Name_Len;
                           Get_Name_String
                             (Lang.Config.Naming_Data.Body_Suffix);
                           Last_Switches.Increment_Last;
                           Last_Switches.Table (Last_Switches.Last) :=
                             new String'("-o");
                           Last_Switches.Increment_Last;
                           Last_Switches.Table (Last_Switches.Last) :=
                             new String'(Spec (Spec'First .. Last) &
                                           Name_Buffer (1 .. Name_Len));
                        end if;
                     end;
                  end if;
               end if;

               --  Add the directory of the spec as the destination directory
               --  of the body, if there is no destination directory already
               --  specified.

               if File_Index /= 0 then
                  for Index in File_Index + 1 .. Last loop
                     if Last_Switches.Table (Index)
                         (Last_Switches.Table (Index)'First) /= '-'
                     then
                        Dir_Index := Index;
                        exit;
                     end if;
                  end loop;

                  if Dir_Index = 0 then
                     Last_Switches.Increment_Last;
                     Last_Switches.Table (Last_Switches.Last) :=
                       new String'
                             (Dir_Name (Last_Switches.Table (File_Index).all));
                  end if;
               end if;
            end;
         end if;

         --  For gnatmetric, the generated files should be put in the object
         --  directory. This must be the first switch, because it may be
         --  overridden by a switch in package Metrics in the project file or
         --  by a command line option. Note that we don't add the -d= switch
         --  if there is no object directory available.

         if The_Command = Metric
           and then Project.Object_Directory /= No_Path_Information
         then
            First_Switches.Increment_Last;
            First_Switches.Table (2 .. First_Switches.Last) :=
              First_Switches.Table (1 .. First_Switches.Last - 1);
            First_Switches.Table (1) :=
              new String'("-d=" &
                          Get_Name_String (Project.Object_Directory.Name));
         end if;

         --  For gnat check, -rules and the following switches need to be the
         --  last options, so move all these switches to table Rules_Switches.

         if The_Command = Check then
            declare
               New_Last : Natural;
               --  Set to rank of options preceding "-rules"

               In_Rules_Switches : Boolean;
               --  Set to True when options "-rules" is found

            begin
               New_Last := First_Switches.Last;
               In_Rules_Switches := False;

               for J in 1 .. First_Switches.Last loop
                  if In_Rules_Switches then
                     Add_To_Rules_Switches (First_Switches.Table (J));

                  elsif First_Switches.Table (J).all = "-rules" then
                     New_Last := J - 1;
                     In_Rules_Switches := True;
                  end if;
               end loop;

               if In_Rules_Switches then
                  First_Switches.Set_Last (New_Last);
               end if;

               New_Last := Last_Switches.Last;
               In_Rules_Switches := False;

               for J in 1 .. Last_Switches.Last loop
                  if In_Rules_Switches then
                     Add_To_Rules_Switches (Last_Switches.Table (J));

                  elsif Last_Switches.Table (J).all = "-rules" then
                     New_Last := J - 1;
                     In_Rules_Switches := True;
                  end if;
               end loop;

               if In_Rules_Switches then
                  Last_Switches.Set_Last (New_Last);
               end if;
            end;
         end if;

         --  For gnat check, sync, metric or pretty with -U + a main, get the
         --  list of sources from the closure and add them to the arguments.

         if ASIS_Main /= null then
            Get_Closure;

            --  On VMS, set up the env var again for source dirs file. This is
            --  because the call to gnatmake has set this env var to another
            --  file that has now been deleted.

            if Hostparm.OpenVMS then

               --  First make sure that the recorded file names are empty

               Prj.Env.Initialize (Project_Tree);

               Prj.Env.Set_Ada_Paths
                 (Project, Project_Tree, Including_Libraries => False);
            end if;

         --  For gnat check, gnat sync, gnat pretty, gnat metric, gnat list,
         --  and gnat stack, if no file has been put on the command line, call
         --  tool with all the sources of the main project.

         elsif The_Command = Check  or else
               The_Command = Sync   or else
               The_Command = Pretty or else
               The_Command = Metric or else
               The_Command = List   or else
               The_Command = Stack
         then
            Check_Files;
         end if;
      end if;

      --  Gather all the arguments and invoke the executable

      declare
         The_Args : Argument_List
                      (1 .. First_Switches.Last +
                            Last_Switches.Last +
                            Carg_Switches.Last +
                            Rules_Switches.Last);
         Arg_Num  : Natural := 0;

      begin
         for J in 1 .. First_Switches.Last loop
            Arg_Num := Arg_Num + 1;
            The_Args (Arg_Num) := First_Switches.Table (J);
         end loop;

         for J in 1 .. Last_Switches.Last loop
            Arg_Num := Arg_Num + 1;
            The_Args (Arg_Num) := Last_Switches.Table (J);
         end loop;

         for J in 1 .. Carg_Switches.Last loop
            Arg_Num := Arg_Num + 1;
            The_Args (Arg_Num) := Carg_Switches.Table (J);
         end loop;

         for J in 1 .. Rules_Switches.Last loop
            Arg_Num := Arg_Num + 1;
            The_Args (Arg_Num) := Rules_Switches.Table (J);
         end loop;

         --  If Display_Command is on, only display the generated command

         if Display_Command then
            Put (Standard_Error, "generated command -->");
            Put (Standard_Error, Exec_Path.all);

            for Arg in The_Args'Range loop
               Put (Standard_Error, " ");
               Put (Standard_Error, The_Args (Arg).all);
            end loop;

            Put (Standard_Error, "<--");
            New_Line (Standard_Error);
            raise Normal_Exit;
         end if;

         if Verbose_Mode then
            Output.Write_Str (Exec_Path.all);

            for Arg in The_Args'Range loop
               Output.Write_Char (' ');
               Output.Write_Str (The_Args (Arg).all);
            end loop;

            Output.Write_Eol;
         end if;

         My_Exit_Status :=
           Exit_Status (Spawn (Exec_Path.all, The_Args));
         raise Normal_Exit;
      end;
   end;

exception
   when Error_Exit =>
      if not Keep_Temporary_Files then
         Prj.Delete_All_Temp_Files (Project_Tree.Shared);
         Delete_Temp_Config_Files;
      end if;

      Set_Exit_Status (Failure);

   when Normal_Exit =>
      if not Keep_Temporary_Files then
         Prj.Delete_All_Temp_Files (Project_Tree.Shared);
         Delete_Temp_Config_Files;
      end if;

      --  Since GNATCmd is normally called from DCL (the VMS shell), it must
      --  return an understandable VMS exit status. However the exit status
      --  returned *to* GNATCmd is a Posix style code, so we test it and return
      --  just a simple success or failure on VMS.

      if Hostparm.OpenVMS and then My_Exit_Status /= Success then
         Set_Exit_Status (Failure);
      else
         Set_Exit_Status (My_Exit_Status);
      end if;
end GNATCmd;