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

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                                  O P T                                   --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2011, 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.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- 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).

--  Some flags are labelled "PROJECT MANAGER". These are used by tools that

--  use the Project Manager. These tools include gnatmake, gnatname, the gnat

--  driver, gnatclean, gprbuild and gprclean.

with Hostparm; use Hostparm;

with Types;    use Types;

pragma Warnings (Off);

--  This package is used also by gnatcoll

with System.Strings; use System.Strings;

with System.WCh_Con; use System.WCh_Con;

pragma Warnings (On);

package Opt is

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

   -- Checksum Control --

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

   --  Checksums are computed for sources to check for sources being the same

   --  from a compilation point of view (e.g. spelling of identifiers and

   --  white space layout do not count in this computation).

   --  The way the checksum is computed has evolved across the various versions

   --  of GNAT. When gprbuild is called with -m, the checksums must be computed

   --  the same way in gprbuild as it was in the GNAT version of the compiler.

   --  The different ways are

   --    Version 6.4 and later:

   --      The Accumulate_Token_Checksum procedure is called after each numeric

   --      literal and each identifier/keyword. For keywords, Tok_Identifier is

   --      used in the call to Accumulate_Token_Checksum.

   --    Versions 5.04 to 6.3:

   --      For keywords, the token value were used in the call to procedure

   --      Accumulate_Token_Checksum. Type Token_Type did not include Tok_Some.

   --    Versions 5.03:

   --      For keywords, the token value were used in the call to

   --      Accumulate_Token_Checksum. Type Token_Type did not include

   --      Tok_Interface, Tok_Overriding, Tok_Synchronized and Tok_Some.

   --    Versions 5.02 and before:

   --      No calls to procedure Accumulate_Token_Checksum (the checksum

   --      mechanism was introduced in version 5.03).

   --  To signal to the scanner whether Accumulate_Token_Checksum needs to be

   --  called and what versions to call, the following Boolean flags are used:

   Checksum_Accumulate_Token_Checksum : Boolean := True;

   --  GPRBUILD

   --  Set to False by gprbuild when the version of GNAT is 5.02 or before. If

   --  this switch is False, then we do not call Accumulate_Token_Checksum, so

   --  the setting of the following two flags is irrelevant.

   Checksum_GNAT_6_3 : Boolean := False;

   --  GPRBUILD

   --  Set to True by gprbuild when the version of GNAT is 6.3 or before.

   Checksum_GNAT_5_03 : Boolean := False;

   --  GPRBUILD

   --  Set to True by gprbuild when the version of GNAT is 5.03 or before.

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

   -- 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 appropriate 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.

   type Ada_Version_Type is (Ada_83, Ada_95, Ada_2005, Ada_2012);

   pragma Ordered (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.

   --  Think twice before using "="; Ada_Version >= Ada_2012 is more likely

   --  what you want, because it will apply to future versions of the language.

   Ada_Version_Default : constant Ada_Version_Type := Ada_2005;

   pragma Warnings (Off, Ada_Version_Default);

   --  GNAT

   --  Default Ada version if no switch given. The Warnings off is to kill

   --  constant condition warnings.

   --

   --  WARNING: some scripts rely on the format of this line of code. Any

   --  change must be coordinated with the scripts requirements.

   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_05/12)

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

   Ada_Version_Runtime : Ada_Version_Type := Ada_2012;

   --  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. Set by use of -gnatf.

   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.

   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).

   Assertions_Enabled : Boolean := False;

   --  GNAT

   --  Enable assertions made using pragma Assert

   Assume_No_Invalid_Values : Boolean := False;

   --  GNAT

   --  Normally, in accordance with (RM 13.9.1 (9-11)) the front end assumes

   --  that values could have invalid representations, unless it can clearly

   --  prove that the values are valid. If this switch is set (by -gnatB or by

   --  pragma Assume_No_Invalid_Values (Off)), then the compiler assumes values

   --  are valid and in range of their representations. This feature is now

   --  fully enabled in the compiler.

   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.

   Back_End_Handles_Limited_Types : Boolean;

   --  This flag is set true if the back end can properly handle limited or

   --  other by reference types, and avoid copies. If this flag is False, then

   --  the front end does special expansion for conditional expressions to make

   --  sure that no copy occurs. If the flag is True, then the expansion for

   --  conditional expressions relies on the back end properly handling things.

   --  Currently the default is False for all cases (set in gnat1drv). The

   --  default can be modified using -gnatd.L (sets the flag True).

   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, GPRBUILD

   --  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_Policy_List : Node_Id := Empty;

   --  GNAT

   --  This points to the list of N_Pragma nodes for Check_Policy pragmas

   --  that are linked through the Next_Pragma fields, with the list being

   --  terminated by Empty. The order is most recently processed first. Note

   --  that Push_Scope and Pop_Scope in Sem_Ch8 save and restore the value

   --  of this variable, implementing the required scope control for pragmas

   --  appearing a declarative part.

   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, GPBUILD

   --  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.

   CodePeer_Mode : Boolean := False;

   --  GNAT, GNATBIND

   --  Enable full CodePeer mode (SCIL generation, disable switches that

   --  interact badly with it, etc...).

   Commands_To_Stdout : Boolean := False;

   --  GNATMAKE

   --  True if echoed commands to be written to stdout instead of stderr

   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, GPBUILD, GPRCLEAN

   --  GNATMAKE, GPRMAKE, GPRMAKE:

   --    set to True to skip bind and link steps (except when Bind_Only is

   --    True).

   --  GNATCLEAN, GPRCLEAN:

   --    set to True to delete only the files produced by the compiler but not

   --    the library files or the 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

   Debug_Pragmas_Disabled : Boolean := False;

   --  GNAT

   --  Debug pragmas completely disabled (no semantic checking)

   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_Stack_Size : Int := -1;

   --  GNATBIND

   --  Set to default primary stack size in units of bytes. Set by

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

   --  default was set by the binder.

   Default_Sec_Stack_Size : Int := -1;

   --  GNATBIND

   --  Set to default secondary stack size in units of bytes. 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.

   Default_Pool : Node_Id := Empty;

   --  GNAT

   --  Used to record the storage pool name (or null literal) that is the

   --  argument of an applicable pragma Default_Storage_Pool.

   --    Empty:       No pragma Default_Storage_Pool applies.

   --    N_Null node: "pragma Default_Storage_Pool (null);" applies.

   --    otherwise:   "pragma Default_Storage_Pool (X);" applies, and

   --                 this points to the name X.

   --  Push_Scope and Pop_Scope in Sem_Ch8 save and restore this value.

   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, GPRBUILD

   --  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.

   Dump_Source_Text : Boolean := False;

   --  GNAT

   --  Set to True (by -gnatL) to dump source text intermingled with generated

   --  code. Effective only if either of Debug/Print_Generated_Code is true.

   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).

   Dynamic_Stack_Measurement : Boolean := False;

   --  GNATBIND

   --  Set True to enable dynamic stack measurement (-u flag for gnatbind)

   Dynamic_Stack_Measurement_Array_Size : Nat := 100;

   --  GNATBIND

   --  Number of measurements we want to store during dynamic stack analysis.

   --  When the buffer is full, non-storable results will be output on the fly.

   --  The value is relevant only if Dynamic_Stack_Measurement is set. Set

   --  by processing of -u flag for gnatbind.

   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.

   Error_Msg_Line_Length : Nat := 0;

   --  GNAT

   --  Records the error message line length limit. If this is set to zero,

   --  then we get the old style behavior, in which each call to the error

   --  message routines generates one line of output as a separate message.

   --  If it is set to a non-zero value, then continuation lines are folded

   --  to make a single long message, and then this message is split up into

   --  multiple lines not exceeding the specified length. Set by -gnatj=nn.

   Exception_Handler_Encountered : Boolean := False;

   --  GNAT

   --  This flag is set true if the parser encounters an exception handler.

   --  It is used to set Warn_On_Exception_Propagation True if the restriction

   --  No_Exception_Propagation is set.

   Exception_Extra_Info : Boolean := False;

   --  GNAT

   --  True when switch -gnateE is used. When True, generate extra information

   --  associated with exception messages (in particular range and index

   --  checks).

   Exception_Locations_Suppressed : Boolean := False;

   --  GNAT

   --  Set to 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). 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, the use of 'Constrained with objects of

   --  generic types 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.

   Fast_Math : Boolean := False;

   --  GNAT

   --  Indicates the current setting of Fast_Math mode, as set by the use

   --  of a Fast_Math pragma (set on by Fast_Math (On)).

   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.

   Disable_ALI_File : Boolean := False;

   --  GNAT

   --  Disable generation of ALI file

   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, GPRBUILD

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

   Full_Path_Name_For_Brief_Errors : Boolean := False;

   --  PROJECT MANAGER

   --  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

   Full_List_File_Name : String_Ptr := null;

   --  GNAT

   --  Set to file name to generate full source listing to named file (or if

   --  the name is of the form .xxx, then to name.xxx where name is the source

   --  file name with extension stripped.

   Generate_Processed_File : Boolean := False;

   --  GNAT

   --  True when switch -gnateG is used. When True, create in a file

   --  <source>.prep, if the source is preprocessed.

   Generate_SCO : Boolean := False;

   --  GNAT

   --  True when switch -gnateS is used. When True, Source Coverage Obligation

   --  (SCO) information is generated and output in the ALI file. See unit

   --  Par_SCO for full details.

   Generating_Code : Boolean := False;

   --  GNAT

   --  True if the frontend finished its work and has called the backend to

   --  process the tree and generate the object file.

   Global_Discard_Names : Boolean := False;

   --  GNAT, GNATBIND

   --  True if a pragma Discard_Names appeared as a configuration pragma for

   --  the current compilation unit.

   GNAT_Mode : Boolean := False;

   --  GNAT

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

   Heap_Size : Nat := 0;

   --  GNATBIND

   --  Heap size for memory allocations. Valid values are 32 and 64. Only

   --  available on VMS.

   HLO_Active : Boolean := False;

   --  GNAT

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

   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.

   Ignore_Rep_Clauses : Boolean := False;

   --  GNAT

   --  Set True to ignore all representation clauses. Useful when compiling

   --  code from foreign compilers for checking or ASIS purposes. Can be

   --  set True by use of -gnatI.

   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.

   Implicit_Packing : Boolean := False;

   --  GNAT

   --  If set True, then a Size attribute clause on an array is allowed to

   --  cause implicit packing instead of generating an error message. Set by

   --  use of pragma Implicit_Packing.

   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.

   Generate_SCIL : Boolean := False;

   --  GNAT

   --  Set True to activate SCIL code generation.

   Invalid_Value_Used : Boolean := False;

   --  GNAT

   --  Set True if a valid Invalid_Value attribute is encountered

   Follow_Links_For_Files : Boolean := False;

   --  PROJECT MANAGER

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

   --  Follow_Links is False, it is assumed that the project doesn't contain

   --  any file duplicated through symbolic links (although the latter are

   --  still valid if they point to a file which is outside of the project),

   --  and that no directory has a name which is a valid source name.

   Follow_Links_For_Dirs : Boolean := False;

   --  PROJECT MANAGER

   --  Set to True if directories can be links in this project, and therefore

   --  additional system calls must be performed to ensure that we always see

   --  the same full name for each directory.

   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 i.e. in the object

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

   --  if not.

   Keep_Going : Boolean := False;

   --  GNATMAKE, GPRMAKE, GPRBUILD

   --  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.

   Leap_Seconds_Support : Boolean := False;

   --  GNATBIND

   --  Set to True to enable leap seconds support in Ada.Calendar and its

   --  children.

   Link_Only : Boolean := False;

   --  GNATMAKE, GPRMAKE, GPRBUILD

   --  Set to True to skip compile and bind steps (except when Bind_Only is

   --  set to True).

   List_Inherited_Aspects : Boolean := False;

   --  GNAT

   --  List inherited invariants, preconditions, and postconditions from

   --  Invariant'Class, Pre'Class, and Post'Class aspects. Also list inherited

   --  subtype predicates. Set True by use of -gnatw.l and False by use of

   --  -gnatw.L.

   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_Closure : Boolean := False;

   --  GNATBIND

   --  List all sources in the closure of a main (-R gnatbind 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