path: root/gcc/ada/gnatcmd.adb

------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                              G N A T C M D                               --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 1996-2004 Free Software Foundation, Inc.          --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
-- MA 02111-1307, USA.                                                      --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

with GNAT.Directory_Operations; use GNAT.Directory_Operations;

with Csets;
with MLib.Tgt; use MLib.Tgt;
with MLib.Utl;
with Namet;    use Namet;
with Opt;
with Osint;    use Osint;
with Output;
with Prj;      use Prj;
with Prj.Com;
with Prj.Env;
with Prj.Ext;  use Prj.Ext;
with Prj.Pars;
with Prj.Util; use Prj.Util;
with Snames;   use Snames;
with Table;
with Types;    use Types;
with Hostparm; use Hostparm;
--  Used to determine if we are in VMS or not for error message purposes

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;

with Table;

with VMS_Conv; use VMS_Conv;

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

   --  This flag indicates a switch -p (for gnatxref and gnatfind) for
   --  an old fashioned project file. -p cannot be used in conjonction
   --  with -P.

   Old_Project_File_Used : Boolean := False;

   --  A table to keep the switches from the project file

   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");

   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.

   Naming_String    : constant String_Access := new String'("naming");
   Binder_String    : constant String_Access := new String'("binder");
   Eliminate_String : constant String_Access := new String'("eliminate");
   Finder_String    : constant String_Access := new String'("finder");
   Linker_String    : constant String_Access := new String'("linker");
   Gnatls_String    : constant String_Access := new String'("gnatls");
   Pretty_String    : constant String_Access := new String'("pretty_printer");
   Gnatstub_String  : constant String_Access := new String'("gnatstub");
   Xref_String      : constant String_Access := new String'("cross_reference");

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

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

   Packages_To_Check_By_Gnatstub  : constant String_List_Access :=
     new String_List'((Naming_String, Gnatstub_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;

   Command_Arg : Positive := 1;

   My_Exit_Status : Exit_Status := Success;

   Current_Work_Dir : constant String := Get_Current_Dir;

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

   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 Name_Id;
   --  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) and gnatelim
   --  (GNAT ELIM).

   procedure Delete_Temp_Config_Files;
   --  Delete all temporary config files

   function Index (Char : Character; Str : String) return Natural;
   --  Returns the first occurrence of Char in Str.
   --  Returns 0 if Char is not in Str.

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

   procedure Set_Library_For
     (Project             : Project_Id;
      There_Are_Libraries : 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
   --  of the library projects.

   procedure Test_If_Relative_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.

   -------------------------------
   -- 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 (Projects.Table
                            (Project).Exec_Directory);

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

         Name_Buffer (Name_Len + 1 ..
                        Name_Len + 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 Name_Id is
   begin
      Prj.Env.Create_Config_Pragmas_File
        (Project, Project, Include_Config_Files => False);
      return Projects.Table (Project).Config_File_Name;
   end Configuration_Pragmas_File;

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

   procedure Delete_Temp_Config_Files is
      Success : Boolean;

   begin
      if Project /= No_Project then
         for Prj in 1 .. Projects.Last loop
            if Projects.Table (Prj).Config_File_Temp then
               if Opt.Verbose_Mode then
                  Output.Write_Str ("Deleting temp configuration file """);
                  Output.Write_Str (Get_Name_String
                                      (Projects.Table (Prj).Config_File_Name));
                  Output.Write_Line ("""");
               end if;

               Delete_File
                 (Name    => Get_Name_String
                  (Projects.Table (Prj).Config_File_Name),
                  Success => Success);
            end if;
         end loop;
      end if;
   end Delete_Temp_Config_Files;

   -----------
   -- Index --
   -----------

   function Index (Char : Character; Str : String) return Natural is
   begin
      for Index in Str'Range loop
         if Str (Index) = Char then
            return Index;
         end if;
      end loop;

      return 0;
   end Index;

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

   procedure Set_Library_For
     (Project             : Project_Id;
      There_Are_Libraries : in out Boolean)
   is
      Path_Option : constant String_Access :=
                      MLib.Linker_Library_Path_Option;

   begin
      --  Case of library project

      if Projects.Table (Project).Library then
         There_Are_Libraries := True;

         --  Add the -L switch

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

         --  Add the -l switch

         Last_Switches.Increment_Last;
         Last_Switches.Table (Last_Switches.Last) :=
           new String'("-l" &
                       Get_Name_String
                       (Projects.Table (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 Projects.Table (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
                            (Projects.Table (Project).Library_Dir));
         end if;

      end if;
   end Set_Library_For;

   ---------------------------
   -- Test_If_Relative_Path --
   ---------------------------

   procedure Test_If_Relative_Path
     (Switch : in out String_Access;
      Parent : String)
   is
   begin
      if Switch /= null then

         declare
            Sw : String (1 .. Switch'Length);
            Start : Positive := 1;

         begin
            Sw := Switch.all;

            if Sw (1) = '-' then
               if Sw'Length >= 3
                 and then (Sw (2) = 'A'
                           or else Sw (2) = 'I'
                           or else Sw (2) = 'L')
               then
                  Start := 3;

                  if Sw = "-I-" then
                     return;
                  end if;

               elsif Sw'Length >= 4
                 and then (Sw (2 .. 3) = "aL"
                           or else Sw (2 .. 3) = "aO"
                           or else Sw (2 .. 3) = "aI")
               then
                  Start := 4;

               elsif Sw'Length >= 7
                 and then Sw (2 .. 6) = "-RTS="
               then
                  Start := 7;
               else
                  return;
               end if;
            end if;

            --  If the path is relative, test if it includes directory
            --  information. If it does, prepend Parent to the path.

            if not Is_Absolute_Path (Sw (Start .. Sw'Last)) then
               for J in Start .. Sw'Last loop
                  if Sw (J) = Directory_Separator then
                     Switch :=
                        new String'
                              (Sw (1 .. Start - 1) &
                               Parent &
                               Directory_Separator &
                               Sw (Start .. Sw'Last));
                     return;
                  end if;
               end loop;
            end if;
         end;
      end if;
   end Test_If_Relative_Path;

   -------------------
   -- 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
         if not Command_List (C).VMS_Only then
            Put ("GNAT " & Command_List (C).Cname.all);
            Set_Col (25);
            Put (Command_List (C).Unixcmd.all);

            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 ("Commands FIND, LIST, PRETTY, STUB and XREF accept " &
                "project file switches -vPx, -Pprj and -Xnam=val");
      New_Line;
   end Non_VMS_Usage;

   -------------------------------------
   -- Start of processing for GNATCmd --
   -------------------------------------

begin
   --  Initializations

   Namet.Initialize;
   Csets.Initialize;

   Snames.Initialize;

   Prj.Initialize;

   Last_Switches.Init;
   Last_Switches.Set_Last (0);

   First_Switches.Init;
   First_Switches.Set_Last (0);

   VMS_Conv.Initialize;

   --  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);

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

   else
      if Argument_Count = 0 then
         Non_VMS_Usage;
         return;
      else
         begin
            if Argument_Count > 1 and then Argument (1) = "-v" then
               Opt.Verbose_Mode := True;
               Command_Arg := 2;
            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;
   end if;

   declare
      Program : constant String :=
                  Program_Name (Command_List (The_Command).Unixcmd.all).all;

      Exec_Path : String_Access;

   begin
      --  Locate the executable for the command

      Exec_Path := Locate_Exec_On_Path (Program);

      if Exec_Path = null then
         Put_Line (Standard_Error, "Couldn't locate " & Program);
         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, FIND, LINK, LIST, PRETTY ad  XREF, look for project file
      --  related switches.

      if The_Command = Bind
        or else The_Command = Elim
        or else The_Command = Find
        or else The_Command = Link
        or else The_Command = List
        or else The_Command = Xref
        or else The_Command = Pretty
        or else The_Command = Stub
      then
         case The_Command is
            when Bind =>
               Tool_Package_Name := Name_Binder;
               Packages_To_Check := Packages_To_Check_By_Binder;
            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 Pretty =>
               Tool_Package_Name := Name_Pretty_Printer;
               Packages_To_Check := Packages_To_Check_By_Pretty;
            when Stub =>
               Tool_Package_Name := Name_Gnatstub;
               Packages_To_Check := Packages_To_Check_By_Gnatstub;
            when Xref =>
               Tool_Package_Name := Name_Cross_Reference;
               Packages_To_Check := Packages_To_Check_By_Xref;
            when others =>
               null;
         end case;

         --  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;

                  --  -vPx  Specify verbosity while parsing project files

                  if Argv'Length = 4
                    and then Argv (Argv'First + 1 .. Argv'First + 2) = "vP"
                  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 =>
                           Fail ("Invalid switch: ", Argv.all);
                     end case;

                     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
                     declare
                        Equal_Pos : constant Natural :=
                          Index ('=', Argv (Argv'First + 2 .. Argv'Last));
                     begin
                        if Equal_Pos >= Argv'First + 3 and then
                          Equal_Pos /= Argv'Last then
                           Add (External_Name =>
                                  Argv (Argv'First + 2 .. Equal_Pos - 1),
                                Value => Argv (Equal_Pos + 1 .. Argv'Last));
                        else
                           Fail
                             (Argv.all,
                              " is not a valid external assignment.");
                        end if;
                     end;

                     Remove_Switch (Arg_Num);

                  else
                     Arg_Num := Arg_Num + 1;
                  end if;

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

      --  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,
            Project_File_Name => Project_File.all,
            Packages_To_Check => Packages_To_Check);

         if Project = Prj.No_Project then
            Fail ("""", Project_File.all, """ processing failed");
         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
            Data : constant Prj.Project_Data :=
                     Prj.Projects.Table (Project);

            Pkg : constant Prj.Package_Id :=
                    Prj.Util.Value_Of
                      (Name        => Tool_Package_Name,
                       In_Packages => Data.Decl.Packages);

            Element : Package_Element;

            Default_Switches_Array : Array_Element_Id;

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

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

               --  Packages Gnatls has a single attribute Switches, that is
               --  not an associative array.

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

               --  Packages Binder (for gnatbind), Cross_Reference (for
               --  gnatxref), Linker (for gnatlink) Finder (for gnatfind),
               --  Pretty_Printer (for gnatpp) and Eliminate (for gnatelim)
               --  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
                  if The_Switches.Kind = Prj.Undefined then
                     Default_Switches_Array :=
                       Prj.Util.Value_Of
                         (Name => Name_Default_Switches,
                          In_Arrays => Element.Decl.Arrays);
                     The_Switches := Prj.Util.Value_Of
                       (Index     => Name_Ada,
                        Src_Index => 0,
                        In_Array  => Default_Switches_Array);
                  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 := 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
            Change_Dir
              (Get_Name_String
                 (Projects.Table (Project).Object_Directory));
         end if;

         --  Set up the env vars for project path files

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

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

         if The_Command = Pretty
           or else The_Command = Stub
           or else The_Command = Elim
         then
            declare
               CP_File : constant Name_Id := Configuration_Pragmas_File;

            begin
               if CP_File /= No_Name then
                  First_Switches.Increment_Last;

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

                  else
                     First_Switches.Table (First_Switches.Last) :=
                       new String'("-gnatec=" & Get_Name_String (CP_File));
                  end if;
               end if;
            end;
         end if;

         if The_Command = Link then

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

            Add_Default_Search_Dirs;

            declare
               There_Are_Libraries  : Boolean := False;
               Path_Option : constant String_Access :=
                               MLib.Linker_Library_Path_Option;

            begin
               Library_Paths.Set_Last (0);

               --  Check if there are library project files

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

               --  If there are, add the necessary additional switches

               if There_Are_Libraries then

                  --  Add -L<lib_dir> -lgnarl -lgnat -Wl,-rpath,<lib_dir>

                  Last_Switches.Increment_Last;
                  Last_Switches.Table (Last_Switches.Last) :=
                    new String'("-L" & MLib.Utl.Lib_Directory);
                  Last_Switches.Increment_Last;
                  Last_Switches.Table (Last_Switches.Last) :=
                    new String'("-lgnarl");
                  Last_Switches.Increment_Last;
                  Last_Switches.Table (Last_Switches.Last) :=
                    new String'("-lgnat");

                  --  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
                        --  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;
                  end if;
               end if;
            end;

            --  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.

            declare
               Skip_Executable : Boolean := False;

            begin
               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";

                        Last           : Natural := Switch'Length;
                        Test_Existence : Boolean := False;

                     begin
                        --  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;

                           else
                              --  Look in the object directories if the ALI
                              --  file exists.

                              declare
                                 Prj : Project_Id := Project;
                              begin
                                 Project_Loop :
                                 loop
                                    declare
                                       Dir : constant String :=
                                         Get_Name_String
                                           (Projects.Table (Prj).
                                              Object_Directory);
                                    begin
                                       if Is_Regular_File
                                         (Dir & Directory_Separator &
                                          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 & Directory_Separator &
                                               ALI_File (1 .. Last));

                                          --  And we are done

                                          exit Switch_Loop;
                                       end if;
                                    end;

                                    --  Go to the project being extended,
                                    --  if any.

                                    Prj := Projects.Table (Prj).Extends;
                                    exit Project_Loop when Prj = No_Project;
                                 end loop Project_Loop;
                              end;
                           end if;
                        end if;
                     end;
                  end if;
               end loop Switch_Loop;
            end;

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

            declare
               Look_For_Executable : Boolean := True;

            begin

               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
                     declare
                        Arg  : constant String_Access :=
                                 Last_Switches.Table (J);
                        Last : Natural := 0;

                     begin
                        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
                              declare
                                 Executable_Name : constant String :=
                                   Base_Name (Arg (Arg'First .. Last));
                              begin
                                 Last_Switches.Increment_Last;
                                 Last_Switches.Table (Last_Switches.Last) :=
                                   new String'("-o");
                                 Get_Name_String
                                   (Projects.Table (Project).Exec_Directory);
                                 Last_Switches.Increment_Last;
                                 Last_Switches.Table (Last_Switches.Last) :=
                                    new String'(Name_Buffer (1 .. Name_Len) &
                                                  Directory_Separator &
                                                  Executable_Name &
                                                  Get_Executable_Suffix.all);
                                 exit;
                              end;
                           end if;
                        end if;
                     end;
                  end loop;
               end if;
            end;
         end if;

         if The_Command = Link or 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
               Test_If_Relative_Path
                 (Last_Switches.Table (J), Current_Work_Dir);
            end loop;

            Get_Name_String (Projects.Table (Project).Directory);

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

            begin
               for J in 1 .. First_Switches.Last loop
                  Test_If_Relative_Path
                    (First_Switches.Table (J), Project_Dir);
               end loop;
            end;

         elsif The_Command = Stub then
            declare
               Data : constant Prj.Project_Data :=
                        Prj.Projects.Table (Project);
               File_Index : Integer := 0;
               Dir_Index  : Integer := 0;
               Last       : constant Integer := Last_Switches.Last;

            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 naming scheme of the project file 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 Data.Naming.Current_Spec_Suffix /=
                 Prj.Default_Ada_Spec_Suffix
               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 (Data.Naming.Current_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 (Data.Naming.Current_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 gnat pretty, if no file has been put on the command line,
         --  call gnatpp with all the sources of the main project.

         if The_Command = Pretty then
            declare
               Add_Sources : Boolean := True;
               Unit_Data   : Prj.Com.Unit_Data;
            begin
               --  Check if there is at least one argument that is not a switch

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

               --  If all arguments were switches, add the path names of
               --  all the sources of the main project.

               if Add_Sources then
                  for Unit in 1 .. Prj.Com.Units.Last loop
                     Unit_Data := Prj.Com.Units.Table (Unit);

                     for Kind in Prj.Com.Spec_Or_Body loop

                        --  Put only sources that belong to the main project

                        if Unit_Data.File_Names (Kind).Project = Project then
                           Last_Switches.Increment_Last;
                           Last_Switches.Table (Last_Switches.Last) :=
                             new String'
                               (Get_Name_String
                                  (Unit_Data.File_Names (Kind).Display_Path));
                        end if;
                     end loop;
                  end loop;
               end if;
            end;
         end if;
      end if;

      --  Gather all the arguments and invoke the executable

      declare
         The_Args : Argument_List
           (1 .. First_Switches.Last + Last_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;

         --  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 Opt.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 =>
      Prj.Env.Delete_All_Path_Files;
      Delete_Temp_Config_Files;
      Set_Exit_Status (Failure);

   when Normal_Exit =>
      Prj.Env.Delete_All_Path_Files;
      Delete_Temp_Config_Files;

      --  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;