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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                                  O P T                                   --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2005, 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,  51  Franklin  Street,  Fifth  Floor, --

-- Boston, MA 02110-1301, USA.                                              --

--                                                                          --

-- As a special exception,  if other files  instantiate  generics from this --

-- unit, or you link  this unit with other files  to produce an executable, --

-- this  unit  does not  by itself cause  the resulting  executable  to  be --

-- covered  by the  GNU  General  Public  License.  This exception does not --

-- however invalidate  any other reasons why  the executable file  might be --

-- covered by the  GNU Public License.                                      --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

--  This package contains global flags set by the initialization routine from

--  the command line and referenced throughout the compiler, the binder, or

--  other GNAT tools. The comments indicate which options are used by which

--  programs (GNAT, GNATBIND, GNATLINK, GNATMAKE, GPRMAKE, etc).

with Gnatvsn;  use Gnatvsn;

with Hostparm; use Hostparm;

with Types;    use Types;

with System.WCh_Con; use System.WCh_Con;

with GNAT.Strings;   use GNAT.Strings;

package Opt is

   ----------------------------------------------

   -- Settings of Modes for Current Processing --

   ----------------------------------------------

   --  The following mode values represent the current state of processing.

   --  The values set here are the default values. Unless otherwise noted,

   --  the value may be reset in Switch with an appropropiate switch. In

   --  some cases, the values can also be modified by pragmas, and in the

   --  case of some binder variables, Gnatbind.Scan_Bind_Arg may modify

   --  the default values.

   Ada_Bind_File : Boolean := True;

   --  GNATBIND, GNATLINK

   --  Set True if binder file to be generated in Ada rather than C

   type Ada_Version_Type is (Ada_83, Ada_95, Ada_05);

   pragma Warnings (Off, Ada_Version_Type);

   --  Versions of Ada for Ada_Version below. Note that these are ordered,

   --  so that tests like Ada_Version >= Ada_95 are legitimate and useful.

   --  The Warnings_Off pragma stops warnings for Ada_Version >= Ada_05,

   --  which we want to allow, so that things work OK when Ada_15 is added!

   --  This warning is now removed, so this pragma can be removed some time???

   Ada_Version_Default : Ada_Version_Type := Ada_95;

   --  GNAT

   --  Default Ada version if no switch given

   Ada_Version : Ada_Version_Type := Ada_Version_Default;

   --  GNAT

   --  Current Ada version for compiler, as set by configuration pragmas,

   --  compiler switches, or implicitly (to Ada_Version_Runtime) when a

   --  predefined or internal file is compiled.

   Ada_Version_Explicit : Ada_Version_Type := Ada_Version_Default;

   --  GNAT

   --  Like Ada_Version, but does not get set implicitly for predefined

   --  or internal units, so it reflects the Ada version explicitly set

   --  using configuration pragmas or compiler switches (or if neither

   --  appears, it remains set to Ada_Version_Default). This is used in

   --  the rare cases (notably for pragmas Preelaborate_05 and Pure_05)

   --  where in the run-time we want the explicit version set.

   Ada_Version_Runtime : Ada_Version_Type := Ada_05;

   --  GNAT

   --  Ada version used to compile the runtime. Used to set Ada_Version (but

   --  not Ada_Version_Explicit) when compiling predefined or internal units.

   Ada_Final_Suffix : constant String := "final";

   Ada_Final_Name : String_Ptr := new String'("ada" & Ada_Final_Suffix);

   --  GNATBIND

   --  The name of the procedure that performs the finalization at the end of

   --  execution. This variable may be modified by Gnatbind.Scan_Bind_Arg.

   Ada_Init_Suffix : constant String := "init";

   Ada_Init_Name : String_Ptr := new String'("ada" & Ada_Init_Suffix);

   --  GNATBIND

   --  The name of the procedure that performs initialization at the start

   --  of execution. This variable may be modified by Gnatbind.Scan_Bind_Arg.

   Ada_Main_Name_Suffix : constant String := "main";

   --  GNATBIND

   --  The suffix for Ada_Main_Name. Defined as a constant here so that it

   --  can be referenced in a uniform manner to create either the default

   --  value of Ada_Main_Name (declared below), or the non-default name

   --  set by Gnatbind.Scan_Bind_Arg.

   Ada_Main_Name : String_Ptr := new String'("ada_" & Ada_Main_Name_Suffix);

   --  GNATBIND

   --  The name of the Ada package generated by the binder (when in Ada mode).

   --  This variable may be modified by Gnatbind.Scan_Bind_Arg.

   Address_Clause_Overlay_Warnings : Boolean := True;

   --  GNAT

   --  Set False to disable address clause warnings

   Address_Is_Private : Boolean := False;

   --  GNAT, GNATBIND

   --  Set True if package System has the line "type Address is private;"

   All_Errors_Mode : Boolean := False;

   --  GNAT

   --  Flag set to force display of multiple errors on a single line and

   --  also repeated error messages for references to undefined identifiers

   --  and certain other repeated error messages.

   All_Sources : Boolean := False;

   --  GNATBIND

   --  Set to True to require all source files to be present. This flag is

   --  directly modified by gnatmake to affect the shared binder routines.

   Alternate_Main_Name : String_Ptr := null;

   --  GNATBIND

   --  Set to non null when Bind_Alternate_Main_Name is True. This value

   --  is modified as needed by Gnatbind.Scan_Bind_Arg.

   Assertions_Enabled : Boolean := False;

   --  GNAT

   --  Enable assertions made using pragma Assert

   ASIS_Mode : Boolean := False;

   --  GNAT

   --  Enable semantic checks and tree transformations that are important

   --  for ASIS but that are usually skipped if Operating_Mode is set to

   --  Check_Semantics. This flag does not have the corresponding option to set

   --  it ON. It is set ON when Tree_Output is set ON, it can also be set ON

   --  from the code of GNSA-based tool (a client may need to set ON the

   --  Back_Annotate_Rep_Info flag in this case. At the moment this does not

   --  make very much sense, because GNSA cannot do back annotation).

   Back_Annotate_Rep_Info : Boolean := False;

   --  GNAT

   --  If set True, enables back annotation of representation information

   --  by gigi, even in -gnatc mode. This is set True by the use of -gnatR

   --  (list representation information) or -gnatt (generate tree). It is

   --  also set true if certain Unchecked_Conversion instantiations require

   --  checking based on annotated values.

   Bind_Alternate_Main_Name : Boolean := False;

   --  GNATBIND

   --  True if main should be called Alternate_Main_Name.all.

   --  This variable may be set to True by Gnatbind.Scan_Bind_Arg.

   Bind_Main_Program : Boolean := True;

   --  GNATBIND

   --  Set to False if not binding main Ada program

   Bind_For_Library : Boolean := False;

   --  GNATBIND

   --  Set to True if the binder needs to generate a file designed for

   --  building a library. May be set to True by Gnatbind.Scan_Bind_Arg.

   Bind_Only : Boolean := False;

   --  GNATMAKE, GPRMAKE

   --  Set to True to skip compile and link steps

   --  (except when Compile_Only and/or Link_Only are True).

   Blank_Deleted_Lines : Boolean := False;

   --  GNAT, GNATPREP

   --  Output empty lines for each line of preprocessed input that is deleted

   --  in the output, including preprocessor lines starting with a '#'.

   Brief_Output : Boolean := False;

   --  GNAT, GNATBIND

   --  Force brief error messages to standard error, even if verbose mode is

   --  set (so that main error messages go to standard output).

   Build_Bind_And_Link_Full_Project : Boolean := False;

   --  GNATMAKE

   --  Set to True to build, bind and link all the sources of a project file

   --  (switch -B)

   Check_Object_Consistency : Boolean := False;

   --  GNATBIND, GNATMAKE

   --  Set to True to check whether every object file is consistent with

   --  its corresponding ada library information (ALI) file. An object

   --  file is inconsistent with the corresponding ALI file if the object

   --  file does not exist or if it has an older time stamp than the ALI file.

   --  Default above is for GNATBIND. GNATMAKE overrides this default to

   --  True (see Make.Initialize) since we normally do need to check source

   --  consistencies in gnatmake.

   Check_Only : Boolean := False;

   --  GNATBIND

   --  Set to True to do checks only, no output of binder file

   Check_Readonly_Files : Boolean := False;

   --  GNATMAKE

   --  Set to True to check readonly files during the make process

   Check_Source_Files : Boolean := True;

   --  GNATBIND, GNATMAKE

   --  Set to True to enable consistency checking for any source files that

   --  are present (i.e. date must match the date in the library info file).

   --  Set to False for object file consistency check only. This flag is

   --  directly modified by gnatmake, to affect the shared binder routines.

   Check_Switches : Boolean := False;

   --  GNATMAKE, GPRMAKE

   --  Set to True to check compiler options during the make process

   Check_Unreferenced : Boolean := False;

   --  GNAT

   --  Set to True to enable checking for unreferenced entities other

   --  than formal parameters (for which see Check_Unreferenced_Formals)

   Check_Unreferenced_Formals : Boolean := False;

   --  GNAT

   --  Set True to check for unreferenced formals. This is turned on by

   --  -gnatwa/wf/wu and turned off by -gnatwA/wF/wU.

   Check_Withs : Boolean := False;

   --  GNAT

   --  Set to True to enable checking for unused withs, and also the case

   --  of withing a package and using none of the entities in the package.

   Comment_Deleted_Lines : Boolean := False;

   --  GNATPREP

   --  True if source lines removed by the preprocessor should be commented

   --  in the output file.

   Compile_Only : Boolean := False;

   --  GNATMAKE, GNATCLEAN, GPRMAKE

   --  GNATMAKE, GPRMAKE: set to True to skip bind and link steps (except when

   --                     Bind_Only is True).

   --  GNATCLEAN: set to True to only the files produced by the compiler are to

   --             be deleted, but not the library files or executable files.

   Config_File : Boolean := True;

   --  GNAT

   --  Set to False to inhibit reading and processing of gnat.adc file

   Config_File_Names : String_List_Access := null;

   --  GNAT

   --  Names of configuration pragmas files (given by switches -gnatec)

   Configurable_Run_Time_Mode : Boolean := False;

   --  GNAT, GNATBIND

   --  Set True if the compiler is operating in configurable run-time mode.

   --  This happens if the flag Targparm.Configurable_Run_TimeMode_On_Target

   --  is set True, or if pragma No_Run_Time is used. See the spec of Rtsfind

   --  for details on the handling of the latter pragma.

   Constant_Condition_Warnings : Boolean := False;

   --  GNAT

   --  Set to True to activate warnings on constant conditions

   Create_Mapping_File : Boolean := False;

   --  GNATMAKE, GPRMAKE

   --  Set to True (-C switch) to indicate that the compiler will be invoked

   --  with a mapping file (-gnatem compiler switch).

   Debug_Pragmas_Enabled : Boolean := False;

   --  GNAT

   --  Enable debug statements from pragma Debug

   subtype Debug_Level_Value is Nat range 0 .. 3;

   Debugger_Level : Debug_Level_Value := 0;

   --  GNATBIND

   --  The value given to the -g parameter. The default value for -g with

   --  no value is 2. This is usually ignored by GNATBIND, except in the

   --  VMS version where it is passed as an argument to __gnat_initialize

   --  to trigger the activation of the remote debugging interface.

   --  Is this still true ???

   Debug_Generated_Code : Boolean := False;

   --  GNAT

   --  Set True (-gnatD switch) to debug generated expanded code instead

   --  of the original source code. Causes debugging information to be

   --  written with respect to the generated code file that is written.

   Default_Exit_Status : Int := 0;

   --  GNATBIND

   --  Set the default exit status value. Set by the -Xnnn switch for the

   --  binder.

   Default_Sec_Stack_Size : Int := -1;

   --  GNATBIND

   --  Set to default secondary stack size in units of kilobytes. Set by

   --  the -Dnnn switch for the binder. A value of -1 indicates that no

   --  default was set by the binder, and that the default should be the

   --  initial value of System.Secondary_Stack.Default_Secondary_Stack_Size.

   Detect_Blocking : Boolean := False;

   --  GNAT

   --  Set True to force the run time to raise Program_Error if calls to

   --  potentially blocking operations are detected from protected actions.

   Display_Compilation_Progress : Boolean := False;

   --  GNATMAKE, GPRMAKE

   --  Set True (-d switch) to display information on progress while compiling

   --  files. Internal flag to be used in conjunction with an IDE (e.g GPS).

   type Distribution_Stub_Mode_Type is

   --  GNAT

     (No_Stubs,

      --  Normal mode, no generation/compilation of distribution stubs

      Generate_Receiver_Stub_Body,

      --  The unit being compiled is the RCI body, and the compiler will

      --  generate the body for the receiver stubs and compile it.

      Generate_Caller_Stub_Body);

      --  The unit being compiled is the RCI spec, and the compiler will

      --  generate the body for the caller stubs and compile it.

   Distribution_Stub_Mode : Distribution_Stub_Mode_Type := No_Stubs;

   --  GNAT

   --  This enumeration variable indicates the five states of distribution

   --  annex stub generation/compilation.

   Do_Not_Execute : Boolean := False;

   --  GNATMAKE

   --  Set to True if no actual compilations should be undertaken.

   Dynamic_Elaboration_Checks : Boolean := False;

   --  GNAT

   --  Set True for dynamic elaboration checking mode, as set by the -gnatE

   --  switch or by the use of pragma Elaboration_Checks (Dynamic).

   Elab_Dependency_Output : Boolean := False;

   --  GNATBIND

   --  Set to True to output complete list of elaboration constraints

   Elab_Order_Output : Boolean := False;

   --  GNATBIND

   --  Set to True to output chosen elaboration order

   Elab_Warnings : Boolean := False;

   --  GNAT

   --  Set to True to generate full elaboration warnings (-gnatwl)

   Enable_Overflow_Checks : Boolean := False;

   --  GNAT

   --  Set to True if -gnato (enable overflow checks) switch is set,

   --  but not -gnatp.

   Exception_Locations_Suppressed : Boolean := False;

   --  GNAT

   --  This flag is set True if a Suppress_Exception_Locations configuration

   --  pragma is currently active.

   type Exception_Mechanism_Type is

   --  Determines the handling of exceptions. See Exp_Ch11 for details

   --

     (Front_End_Setjmp_Longjmp_Exceptions,

      --  Exceptions use setjmp/longjmp generated explicitly by the

      --  front end (this includes gigi or other equivalent parts of

      --  the code generator). AT END handlers are converted into

      --  exception handlers by the front end in this mode.

      Back_End_Exceptions);

      --  Exceptions are handled by the back end. The front end simply

      --  generates the handlers as they appear in the source, and AT

      --  END handlers are left untouched (they are not converted into

      --  exception handlers when operating in this mode.

   pragma Convention (C, Exception_Mechanism_Type);

   Exception_Mechanism : Exception_Mechanism_Type :=

                           Front_End_Setjmp_Longjmp_Exceptions;

   --  GNAT

   --  Set to the appropriate value depending on the default as given in

   --  system.ads (ZCX_By_Default, GCC_ZCX_Support).

   --  The C convention is there to make this variable accessible to gigi.

   Exception_Tracebacks : Boolean := False;

   --  GNATBIND

   --  Set to True to store tracebacks in exception occurrences (-E)

   Extensions_Allowed : Boolean := False;

   --  GNAT

   --  Set to True by switch -gnatX if GNAT specific language extensions

   --  are allowed. For example, "limited with" is a GNAT extension.

   type External_Casing_Type is (

     As_Is,       -- External names cased as they appear in the Ada source

     Uppercase,   -- External names forced to all uppercase letters

     Lowercase);  -- External names forced to all lowercase letters

   External_Name_Imp_Casing : External_Casing_Type := Lowercase;

   --  GNAT

   --  The setting of this flag determines the casing of external names

   --  when the name is implicitly derived from an entity name (i.e. either

   --  no explicit External_Name or Link_Name argument is used, or, in the

   --  case of extended DEC pragmas, the external name is given using an

   --  identifier. The As_Is setting is not permitted here (since this would

   --  create Ada source programs that were case sensitive).

   External_Name_Exp_Casing : External_Casing_Type := As_Is;

   --  GNAT

   --  The setting of this flag determines the casing of an external name

   --  specified explicitly with a string literal. As_Is means the string

   --  literal is used as given with no modification to the casing. If

   --  Lowercase or Uppercase is set, then the string is forced to all

   --  lowercase or all uppercase letters as appropriate. Note that this

   --  setting has no effect if the external name is given using an identifier

   --  in the case of extended DEC import/export pragmas (in this case the

   --  casing is controlled by External_Name_Imp_Casing), and also has no

   --  effect if an explicit Link_Name is supplied (a link name is always

   --  used exactly as given).

   External_Unit_Compilation_Allowed : Boolean := False;

   --  GNATMAKE

   --  When True (set by gnatmake switch -x), allow compilation of sources

   --  that are not part of any project file.

   Float_Format : Character := ' ';

   --  GNAT

   --  A non-blank value indicates that a Float_Format pragma has been

   --  processed, in which case this variable is set to 'I' for IEEE or

   --  to 'V' for VAX. The setting of 'V' is only possible on OpenVMS

   --  versions of GNAT.

   Float_Format_Long : Character := ' ';

   --  GNAT

   --  A non-blank value indicates that a Long_Float pragma has been

   --  processed (this pragma is recognized only in OpenVMS versions

   --  of GNAT), in which case this variable is set to D or G for

   --  D_Float or G_Float.

   Force_ALI_Tree_File : Boolean := False;

   --  GNAT

   --  Force generation of ALI file even if errors are encountered.

   --  Also forces generation of tree file if -gnatt is also set.

   Force_Checking_Of_Elaboration_Flags : Boolean := False;

   --  GNATBIND

   --  True if binding with forced checking of the elaboration flags

   --  (-F switch set).

   Force_Compilations : Boolean := False;

   --  GNATMAKE, GPRMAKE

   --  Set to force recompilations even when the objects are up-to-date.

   Full_Path_Name_For_Brief_Errors : Boolean := False;

   --  GNAT, GNATMAKE, GNATCLEAN, GPRMAKE

   --  When True, in Brief_Output mode, each error message line

   --  will start with the full path name of the source.

   --  When False, only the file name without directory information

   --  is used.

   Full_List : Boolean := False;

   --  GNAT

   --  Set True to generate full source listing with embedded errors

   function get_gcc_version return Int;

   pragma Import (C, get_gcc_version, "get_gcc_version");

   GCC_Version : constant Nat := get_gcc_version;

   --  GNATMAKE

   --  Indicates which version of gcc is in use (2 = 2.8.1, 3 = 3.x)

   Global_Discard_Names : Boolean := False;

   --  GNAT, GNATBIND

   --  Set true if a pragma Discard_Names applies to the current unit

   GNAT_Mode : Boolean := False;

   --  GNAT

   --  True if compiling in GNAT system mode (-gnatg switch)

   HLO_Active : Boolean := False;

   --  GNAT

   --  True if High Level Optimizer is activated (-gnatH switch)

   Implementation_Unit_Warnings : Boolean := True;

   --  GNAT

   --  Set True to active warnings for use of implementation internal units.

   --  Can be controlled by use of -gnatwi/-gnatwI.

   Identifier_Character_Set : Character;

   --  GNAT

   --  This variable indicates the character set to be used for identifiers.

   --  The possible settings are:

   --    '1'  Latin-5 (ISO-8859-1)

   --    '2'  Latin-5 (ISO-8859-2)

   --    '3'  Latin-5 (ISO-8859-3)

   --    '4'  Latin-5 (ISO-8859-4)

   --    '5'  Latin-5 (ISO-8859-5, Cyrillic)

   --    '9'  Latin-5 (ISO-8859-9)

   --    'p'  PC (US, IBM page 437)

   --    '8'  PC (European, IBM page 850)

   --    'f'  Full upper set (all distinct)

   --    'n'  No upper characters (Ada 83 rules)

   --    'w'  Latin-1 plus wide characters allowed in identifiers

   --

   --  The setting affects the set of letters allowed in identifiers and the

   --  upper/lower case equivalences. It does not affect the interpretation of

   --  character and string literals, which are always stored using the actual

   --  coding in the source program. This variable is initialized to the

   --  default value appropriate to the system (in Osint.Initialize), and then

   --  reset if a command line switch is used to change the setting.

   Ineffective_Inline_Warnings : Boolean := False;

   --  GNAT

   --  Set True to activate warnings if front-end inlining (-gnatN) is not

   --  able to actually inline a particular call (or all calls). Can be

   --  controlled by use of -gnatwp/-gnatwP.

   Init_Or_Norm_Scalars : Boolean := False;

   --  GNAT, GANTBIND

   --  Set True if a pragma Initialize_Scalars applies to the current unit.

   --  Also set True if a pragma Normalize_Scalars applies.

   Initialize_Scalars : Boolean := False;

   --  GNAT

   --  Set True if a pragma Initialize_Scalars applies to the current unit.

   --  Note that Init_Or_Norm_Scalars is also set to True if this is True.

   Initialize_Scalars_Mode1 : Character := 'I';

   Initialize_Scalars_Mode2 : Character := 'N';

   --  GNATBIND

   --  Set to two characters from -S switch (IN/LO/HI/EV/xx). The default

   --  is IN (invalid values), used if no -S switch is used.

   Inline_Active : Boolean := False;

   --  GNAT

   --  Set True to activate pragma Inline processing across modules. Default

   --  for now is not to inline across module boundaries.

   Interface_Library_Unit : Boolean := False;

   --  GNATBIND

   --  Set to True to indicate that at least one ALI file is an interface ALI:

   --  then elaboration flag checks are to be generated in the binder

   --  generated file.

   Follow_Links : Boolean := False;

   --  GNATMAKE

   --  Set to True (-eL) to process the project files in trusted mode

   Front_End_Inlining : Boolean := False;

   --  GNAT

   --  Set True to activate inlining by front-end expansion

   Inline_Processing_Required : Boolean := False;

   --  GNAT

   --  Set True if inline processing is required. Inline processing is

   --  required if an active Inline pragma is processed. The flag is set

   --  for a pragma Inline or Inline_Always that is actually active.

   In_Place_Mode : Boolean := False;

   --  GNATMAKE

   --  Set True to store ALI and object files in place ie in the object

   --  directory if these files already exist or in the source directory

   --  if not.

   Keep_Going : Boolean := False;

   --  GNATMAKE, GPRMAKE

   --  When True signals to ignore compilation errors and keep

   --  processing sources until there is no more work.

   Keep_Temporary_Files : Boolean := False;

   --  GNATCMD

   --  When True the temporary files created by the GNAT driver are not

   --  deleted. Set by switch -dn or qualifier /KEEP_TEMPORARY_FILES.

   Link_Only : Boolean := False;

   --  GNATMAKE, GPRMAKE

   --  Set to True to skip compile and bind steps

   --  (except when Bind_Only is set to True).

   List_Restrictions : Boolean := False;

   --  GNATBIND

   --  Set to True to list restrictions pragmas that could apply to partition

   List_Units : Boolean := False;

   --  GNAT

   --  List units in the active library for a compilation (-gnatu switch)

   List_Dependencies : Boolean := False;

   --  GNATMAKE

   --  When True gnatmake verifies that the objects are up to date and

   --  outputs the list of object dependencies (-M switch).

   --  Output depends if -a switch is used or not.

   --  This list can be used directly in a Makefile.

   List_Representation_Info : Int range 0 .. 3 := 0;

   --  GNAT

   --  Set non-zero by -gnatR switch to list representation information.

   --  The settings are as follows:

   --

   --    0 = no listing of representation information (default as above)

   --    1 = list rep info for user defined record and array types

   --    2 = list rep info for all user defined types and objects

   --    3 = like 2, but variable fields are decoded symbolically

   List_Representation_Info_To_File : Boolean := False;

   --  GNAT

   --  Set true by -gnatRs switch. Causes information from -gnatR/1/2/3

   --  to be written to file.rep (where file is the name of the source

   --  file) instead of stdout. For example, if file x.adb is compiled

   --  using -gnatR2s then representation info is written to x.adb.ref.

   List_Representation_Info_Mechanisms : Boolean := False;

   --  GNAT

   --  Set true by -gnatRm switch. Causes information on mechanisms to

   --  be included in the representation output information.

   List_Preprocessing_Symbols : Boolean := False;

   --  GNAT, GNATPREP

   --  Set to True if symbols for preprocessing a source are to be listed

   --  before preprocessing occurs. Set to True by switch -s of gnatprep

   --  or -s in preprocessing data file for the compiler.

   type Creat_Repinfo_File_Proc is access procedure (Src : File_Name_Type);

   type Write_Repinfo_Line_Proc is access procedure (Info : String);

   type Close_Repinfo_File_Proc is access procedure;

   --  Types used for procedure addresses below

   Creat_Repinfo_File_Access : Creat_Repinfo_File_Proc := null;

   Write_Repinfo_Line_Access : Write_Repinfo_Line_Proc := null;

   Close_Repinfo_File_Access : Close_Repinfo_File_Proc := null;

   --  GNAT

   --  These three locations are left null when operating in non-compiler

   --  (e.g. ASIS mode), but when operating in compiler mode, they are

   --  set to point to the three corresponding procedures in Osint. The

   --  reason for this slightly strange interface is to prevent Repinfo

   --  from dragging in Osint in ASIS mode, which would include a lot of

   --  unwanted units in the ASIS build.

   Locking_Policy : Character := ' ';

   --  GNAT, GNATBIND

   --  Set to ' ' for the default case (no locking policy specified).

   --  Reset to first character (uppercase) of locking policy name if a

   --  valid pragma Locking_Policy is encountered.

   Locking_Policy_Sloc : Source_Ptr := No_Location;

   --  GNAT, GNATBIND

   --  Remember location of previous Locking_Policy pragma. This is used

   --  for inconsistency error messages. A value of System_Location is

   --  used if the policy is set in package System.

   Look_In_Primary_Dir : Boolean := True;

   --  GNAT, GNATBIND, GNATMAKE, GNATCLEAN

   --  Set to False if a -I- was present on the command line.

   --  When True we are allowed to look in the primary directory to locate

   --  other source or library files.

   Make_Steps : Boolean := False;

   --  GNATMAKE

   --  Set to True when either Compile_Only, Bind_Only or Link_Only is

   --  set to True.

   Main_Index : Int := 0;

   --  GNATMAKE

   --  This is set to non-zero by gnatmake switch -eInnn to indicate that

   --  the main program is the nnn unit in a multi-unit source file.

   Mapping_File_Name : String_Ptr := null;

   --  GNAT

   --  File name of mapping between unit names, file names and path names.

   --  (given by switch -gnatem)

   Maximum_Errors : Int := 9999;

   --  GNAT, GNATBIND

   --  Maximum default number of errors before compilation is terminated.

   --  Can be overridden using -gnatm (GNAT) or -m (GNATBIND) switch.

   Maximum_File_Name_Length : Int;

   --  GNAT, GNATBIND

   --  Maximum number of characters allowed in a file name, not counting the

   --  extension, as set by the appropriate switch. If no switch is given,

   --  then this value is initialized by Osint to the appropriate value.

   Max_Line_Length : Int := Hostparm.Max_Line_Length;

   --  This is a copy of Max_Line_Length used by the scanner. It is usually

   --  set to be a copy of Hostparm.Max_Line_Length, and is used to check

   --  the maximum line length in the scanner when style checking is inactive.

   --  The only time it is set to a different value is during the scanning of

   --  configuration pragma files, where we want to turn off all checking and

   --  in particular we want to allow long lines. So we reset this value to

   --  Column_Number'Last during scanning of configuration pragma files.

   Maximum_Processes : Positive := 1;

   --  GNATMAKE, GPRMAKE

   --  Maximum number of processes that should be spawned to carry out

   --  compilations.

   Minimal_Recompilation : Boolean := False;

   --  GNATMAKE

   --  Set to True if minimal recompilation mode requested

   Multiple_Unit_Index : Int;

   --  GNAT

   --  This is set non-zero if the current unit is being compiled in multiple

   --  unit per file mode, meaning that the current unit is selected from the

   --  sequence of units in the current source file, using the value stored

   --  in this variable (e.g. 2 = select second unit in file). A value of

   --  zero indicates that we are in normal (one unit per file) mode.

   No_Main_Subprogram : Boolean := False;

   --  GNATMAKE, GNATBIND

   --  Set to True if compilation/binding of a program without main

   --  subprogram requested.

   No_Run_Time_Mode : Boolean := False;

   --  GNAT, GNATBIND

   --  This flag is set True if a No_Run_Time pragma is encountered. See

   --  spec of Rtsfind for a full description of handling of this pragma.

   No_Stdinc : Boolean := False;

   --  GNAT, GNATBIND, GNATMAKE, GNATFIND, GNATXREF

   --  Set to True if no default source search dirs added to search list

   No_Stdlib : Boolean := False;

   --  GNATMAKE, GNATBIND, GNATFIND, GNATXREF

   --  Set to True if no default library search dirs added to search list

   No_Strict_Aliasing : Boolean := False;

   --  GNAT

   --  Set True if pragma No_Strict_Aliasing with no parameters encountered

   Normalize_Scalars : Boolean := False;

   --  GNAT, GNATBIND

   --  Set True if a pragma Normalize_Scalars applies to the current unit.

   --  Note that Init_Or_Norm_Scalars is also set to True if this is True.

   Object_Directory_Present : Boolean := False;

   --  GNATMAKE

   --  Set to True when an object directory is specified with option -D

   type Operating_Mode_Type is (Check_Syntax, Check_Semantics, Generate_Code);

   Operating_Mode : Operating_Mode_Type := Generate_Code;

   --  GNAT

   --  Indicates the operating mode of the compiler. The default is generate

   --  code, which runs the parser, semantics and backend. Switches can be

   --  used to set syntax checking only mode, or syntax and semantics checking

   --  only mode. Operating_Mode can also be modified as a result of detecting

   --  errors during the compilation process. In particular if any serious

   --  error is detected then this flag is reset from Generate_Code to

   --  Check_Semantics after generating an error message.

   Original_Operating_Mode : Operating_Mode_Type := Generate_Code;

   --  GNAT

   --  Indicates the original operating mode of the compiler as set by

   --  compiler options. This is identical to Operating_Mode except that

   --  this is not affected by errors.

   Optimization_Level : Int;

   pragma Import (C, Optimization_Level, "optimize");

   --  This constant reflects the optimization level (0,1,2 for -O0,-O1,-O2)

   Output_File_Name_Present : Boolean := False;

   --  GNATBIND, GNAT, GNATMAKE, GPRMAKE

   --  Set to True when the output C file name is given with option -o

   --  for GNATBIND, when the object file name is given with option

   --  -gnatO for GNAT or when the executable is given with option -o

   --  for GNATMAKE or GPRMAKE.

   Output_Linker_Option_List : Boolean := False;

   --  GNATBIND

   --  True if output of list of linker options is requested (-K switch set)

   Output_Object_List : Boolean := False;

   --  GNATBIND

   --  True if output of list of objects is requested (-O switch set)

   Persistent_BSS_Mode : Boolean := False;

   --  GNAT

   --  True if a Persistent_BSS configuration pragma is in effect, causing

   --  potentially persistent data to be placed in the persistent_bss section.

   Pessimistic_Elab_Order : Boolean := False;

   --  GNATBIND

   --  True if pessimistic elaboration order is to be chosen (-p switch set)

   Polling_Required : Boolean := False;

   --  GNAT

   --  Set to True if polling for asynchronous abort is enabled by using

   --  the -gnatP option for GNAT.

   Preprocessing_Data_File : String_Ptr := null;

   --  GNAT

   --  Set by switch -gnatep=. The file name of the prepocessing data file.

   Print_Generated_Code : Boolean := False;

   --  GNAT

   --  Set to True to enable output of generated code in source form. This

   --  flag is set by the -gnatG switch.

   Print_Standard : Boolean := False;

   --  GNAT

   --  Set to true to enable printing of package standard in source form.

   --  This flag is set by the -gnatS switch

   Propagate_Exceptions : Boolean := False;

   --  GNAT

   --  Indicates if subprogram descriptor exception tables should be

   --  built for imported subprograms. Set True if a Propagate_Exceptions

   --  pragma applies to the extended main unit.

   type Usage is (Unknown, Not_In_Use, In_Use);

   Project_File_In_Use : Usage := Unknown;

   --  GNAT

   --  Indicates if a project file is used or not.

   --  Set to In_Use by the first SFNP pragma.

   Queuing_Policy : Character := ' ';

   --  GNAT, GNATBIND

   --  Set to ' ' for the default case (no queuing policy specified).

   --  Reset to first character (uppercase) of locking policy name if a valid

   --  Queuing_Policy pragma is encountered.

   Queuing_Policy_Sloc : Source_Ptr := No_Location;

   --  GNAT, GNATBIND

   --  Remember location of previous Queuing_Policy pragma. This is used

   --  for inconsistency error messages. A value of System_Location is

   --  used if the policy is set in package System.

   Quiet_Output : Boolean := False;

   --  GNATMAKE, GNATCLEAN, GPRMAKE

   --  Set to True if the tool should not have any output if there are no

   --  errors or warnings.

   Replace_In_Comments : Boolean := False;

   --  GNATPREP

   --  Set to True if -C switch used

   RTS_Lib_Path_Name : String_Ptr := null;

   RTS_Src_Path_Name : String_Ptr := null;

   --  GNAT