gcc/ada/opt.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                                  O P T                                   --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2005, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This package contains global flags set by the initialization routine from
  35 --  the command line and referenced throughout the compiler, the binder, or
  36 --  other GNAT tools. The comments indicate which options are used by which
  37 --  programs (GNAT, GNATBIND, GNATMAKE, etc).
  38
  39 with Gnatvsn;  use Gnatvsn;
  40 with Hostparm; use Hostparm;
  41 with Types;    use Types;
  42
  43 with System.WCh_Con; use System.WCh_Con;
  44 with GNAT.Strings;   use GNAT.Strings;
  45
  46 package Opt is
  47
  48    ----------------------------------------------
  49    -- Settings of Modes for Current Processing --
  50    ----------------------------------------------
  51
  52    --  The following mode values represent the current state of processing.
  53    --  The values set here are the default values. Unless otherwise noted,
  54    --  the value may be reset in Switch with an appropropiate switch. In
  55    --  some cases, the values can also be modified by pragmas, and in the
  56    --  case of some binder variables, Gnatbind.Scan_Bind_Arg may modify
  57    --  the default values.
  58
  59    Ada_Bind_File : Boolean := True;
  60    --  GNATBIND, GNATLINK
  61    --  Set True if binder file to be generated in Ada rather than C
  62
  63    type Ada_Version_Type is (Ada_83, Ada_95, Ada_05);
  64    --  Versions of Ada for Ada_Version below. Note that these are ordered,
  65    --  so that tests like Ada_Version >= Ada_95 are legitimate and useful.
  66
  67    Ada_Version_Default : Ada_Version_Type := Ada_95;
  68    --  GNAT
  69    --  Default Ada version if no switch given
  70
  71    Ada_Version : Ada_Version_Type := Ada_Version_Default;
  72    --  GNAT
  73    --  Current Ada version for compiler, as set by configuration pragmas,
  74    --  compiler switches, or implicitly (to Ada_Version_Runtime) when a
  75    --  predefined or internal file is compiled.
  76
  77    Ada_Version_Explicit : Ada_Version_Type := Ada_Version_Default;
  78    --  GNAT
  79    --  Like Ada_Version, but does not get set implicitly for predefined
  80    --  or internal units, so it reflects the Ada version explicitly set
  81    --  using configuration pragmas or compiler switches (or if neither
  82    --  appears, it remains set to Ada_Version_Default). This is used in
  83    --  the rare cases (notably for pragmas Preelaborate_05 and Pure_05)
  84    --  where in the run-time we want the explicit version set.
  85
  86    Ada_Version_Runtime : Ada_Version_Type := Ada_05;
  87    --  GNAT
  88    --  Ada version used to compile the runtime. Used to set Ada_Version (but
  89    --  not Ada_Version_Explicit) when compiling predefined or internal units.
  90
  91    Ada_Final_Suffix : constant String := "final";
  92    Ada_Final_Name : String_Ptr := new String'("ada" & Ada_Final_Suffix);
  93    --  GNATBIND
  94    --  The name of the procedure that performs the finalization at the end of
  95    --  execution. This variable may be modified by Gnatbind.Scan_Bind_Arg.
  96
  97    Ada_Init_Suffix : constant String := "init";
  98    Ada_Init_Name : String_Ptr := new String'("ada" & Ada_Init_Suffix);
  99    --  GNATBIND
 100    --  The name of the procedure that performs initialization at the start
 101    --  of execution. This variable may be modified by Gnatbind.Scan_Bind_Arg.
 102
 103    Ada_Main_Name_Suffix : constant String := "main";
 104    --  GNATBIND
 105    --  The suffix for Ada_Main_Name. Defined as a constant here so that it
 106    --  can be referenced in a uniform manner to create either the default
 107    --  value of Ada_Main_Name (declared below), or the non-default name
 108    --  set by Gnatbind.Scan_Bind_Arg.
 109
 110    Ada_Main_Name : String_Ptr := new String'("ada_" & Ada_Main_Name_Suffix);
 111    --  GNATBIND
 112    --  The name of the Ada package generated by the binder (when in Ada mode).
 113    --  This variable may be modified by Gnatbind.Scan_Bind_Arg.
 114
 115    Address_Clause_Overlay_Warnings : Boolean := True;
 116    --  GNAT
 117    --  Set False to disable address clause warnings
 118
 119    Address_Is_Private : Boolean := False;
 120    --  GNAT, GNATBIND
 121    --  Set True if package System has the line "type Address is private;"
 122
 123    All_Errors_Mode : Boolean := False;
 124    --  GNAT
 125    --  Flag set to force display of multiple errors on a single line and
 126    --  also repeated error messages for references to undefined identifiers
 127    --  and certain other repeated error messages.
 128
 129    All_Sources : Boolean := False;
 130    --  GNATBIND
 131    --  Set to True to require all source files to be present. This flag is
 132    --  directly modified by gnatmake to affect the shared binder routines.
 133
 134    Alternate_Main_Name : String_Ptr := null;
 135    --  GNATBIND
 136    --  Set to non null when Bind_Alternate_Main_Name is True. This value
 137    --  is modified as needed by Gnatbind.Scan_Bind_Arg.
 138
 139    Assertions_Enabled : Boolean := False;
 140    --  GNAT
 141    --  Enable assertions made using pragma Assert
 142
 143    ASIS_Mode : Boolean := False;
 144    --  GNAT
 145    --  Enable semantic checks and tree transformations that are important
 146    --  for ASIS but that are usually skipped if Operating_Mode is set to
 147    --  Check_Semantics. This flag does not have the corresponding option to set
 148    --  it ON. It is set ON when Tree_Output is set ON, it can also be set ON
 149    --  from the code of GNSA-based tool (a client may need to set ON the
 150    --  Back_Annotate_Rep_Info flag in this case. At the moment this does not
 151    --  make very much sense, because GNSA can not do back annotation).
 152
 153    Back_Annotate_Rep_Info : Boolean := False;
 154    --  GNAT
 155    --  If set True, enables back annotation of representation information
 156    --  by gigi, even in -gnatc mode. This is set True by the use of -gnatR
 157    --  (list representation information) or -gnatt (generate tree). It is
 158    --  also set true if certain Unchecked_Conversion instantiations require
 159    --  checking based on annotated values.
 160
 161    Bind_Alternate_Main_Name : Boolean := False;
 162    --  GNATBIND
 163    --  True if main should be called Alternate_Main_Name.all.
 164    --  This variable may be set to True by Gnatbind.Scan_Bind_Arg.
 165
 166    Bind_Main_Program : Boolean := True;
 167    --  GNATBIND
 168    --  Set to False if not binding main Ada program
 169
 170    Bind_For_Library : Boolean := False;
 171    --  GNATBIND
 172    --  Set to True if the binder needs to generate a file designed for
 173    --  building a library. May be set to True by Gnatbind.Scan_Bind_Arg.
 174
 175    Bind_Only : Boolean := False;
 176    --  GNATMAKE
 177    --  Set to True to skip compile and link steps
 178    --  (except when Compile_Only and/or Link_Only are True).
 179
 180    Blank_Deleted_Lines : Boolean := False;
 181    --  GNAT, GNATPREP
 182    --  Output empty lines for each line of preprocessed input that is deleted
 183    --  in the output, including preprocessor lines starting with a '#'.
 184
 185    Brief_Output : Boolean := False;
 186    --  GNAT, GNATBIND
 187    --  Force brief error messages to standard error, even if verbose mode is
 188    --  set (so that main error messages go to standard output).
 189
 190    Build_Bind_And_Link_Full_Project : Boolean := False;
 191    --  GNATMAKE
 192    --  Set to True to build, bind and link all the sources of a project file
 193    --  (switch -B)
 194
 195    Check_Object_Consistency : Boolean := False;
 196    --  GNATBIND, GNATMAKE
 197    --  Set to True to check whether every object file is consistent with
 198    --  its corresponding ada library information (ALI) file. An object
 199    --  file is inconsistent with the corresponding ALI file if the object
 200    --  file does not exist or if it has an older time stamp than the ALI file.
 201    --  Default above is for GNATBIND. GNATMAKE overrides this default to
 202    --  True (see Make.Initialize) since we normally do need to check source
 203    --  consistencies in gnatmake.
 204
 205    Check_Only : Boolean := False;
 206    --  GNATBIND
 207    --  Set to True to do checks only, no output of binder file
 208
 209    Check_Readonly_Files : Boolean := False;
 210    --  GNATMAKE
 211    --  Set to True to check readonly files during the make process
 212
 213    Check_Source_Files : Boolean := True;
 214    --  GNATBIND, GNATMAKE
 215    --  Set to True to enable consistency checking for any source files that
 216    --  are present (i.e. date must match the date in the library info file).
 217    --  Set to False for object file consistency check only. This flag is
 218    --  directly modified by gnatmake, to affect the shared binder routines.
 219
 220    Check_Switches : Boolean := False;
 221    --  GNATMAKE
 222    --  Set to True to check compiler options during the make process
 223
 224    Check_Unreferenced : Boolean := False;
 225    --  GNAT
 226    --  Set to True to enable checking for unreferenced entities other
 227    --  than formal parameters (for which see Check_Unreferenced_Formals)
 228
 229    Check_Unreferenced_Formals : Boolean := False;
 230    --  GNAT
 231    --  Set True to check for unreferenced formals. This is turned on by
 232    --  -gnatwa/wf/wu and turned off by -gnatwA/wF/wU.
 233
 234    Check_Withs : Boolean := False;
 235    --  GNAT
 236    --  Set to True to enable checking for unused withs, and also the case
 237    --  of withing a package and using none of the entities in the package.
 238
 239    Comment_Deleted_Lines : Boolean := False;
 240    --  GNATPREP
 241    --  True if source lines removed by the preprocessor should be commented
 242    --  in the output file.
 243
 244    Compile_Only : Boolean := False;
 245    --  GNATMAKE, GNATCLEAN
 246    --  GNATMAKE: set to True to skip bind and link steps (except when
 247    --            Bind_Only is True).
 248    --  GNATCLEAN: set to True to only the files produced by the compiler are to
 249    --             be deleted, but not the library files or executable files.
 250
 251    Config_File : Boolean := True;
 252    --  GNAT
 253    --  Set to False to inhibit reading and processing of gnat.adc file
 254
 255    Config_File_Names : String_List_Access := null;
 256    --  GNAT
 257    --  Names of configuration pragmas files (given by switches -gnatec)
 258
 259    Configurable_Run_Time_Mode : Boolean := False;
 260    --  GNAT, GNATBIND
 261    --  Set True if the compiler is operating in configurable run-time mode.
 262    --  This happens if the flag Targparm.Configurable_Run_TimeMode_On_Target
 263    --  is set True, or if pragma No_Run_Time is used. See the spec of Rtsfind
 264    --  for details on the handling of the latter pragma.
 265
 266    Constant_Condition_Warnings : Boolean := False;
 267    --  GNAT
 268    --  Set to True to activate warnings on constant conditions
 269
 270    Create_Mapping_File : Boolean := False;
 271    --  GNATMAKE
 272    --  Set to True (-C switch) to indicate that gnatmake will invoke
 273    --  the compiler with a mapping file (-gnatem compiler switch).
 274
 275    subtype Debug_Level_Value is Nat range 0 .. 3;
 276    Debugger_Level : Debug_Level_Value := 0;
 277    --  GNATBIND
 278    --  The value given to the -g parameter. The default value for -g with
 279    --  no value is 2. This is usually ignored by GNATBIND, except in the
 280    --  VMS version where it is passed as an argument to __gnat_initialize
 281    --  to trigger the activation of the remote debugging interface.
 282    --  Is this still true ???
 283
 284    Debug_Generated_Code : Boolean := False;
 285    --  GNAT
 286    --  Set True (-gnatD switch) to debug generated expanded code instead
 287    --  of the original source code. Causes debugging information to be
 288    --  written with respect to the generated code file that is written.
 289
 290    Default_Exit_Status : Int := 0;
 291    --  GNATBIND
 292    --  Set the default exit status value. Set by the -Xnnn switch for the
 293    --  binder.
 294
 295    Default_Sec_Stack_Size : Int := -1;
 296    --  GNATBIND
 297    --  Set to default secondary stack size in units of kilobytes. Set by
 298    --  the -Dnnn switch for the binder. A value of -1 indicates that no
 299    --  default was set by the binder, and that the default should be the
 300    --  initial value of System.Secondary_Stack.Default_Secondary_Stack_Size.
 301
 302    Detect_Blocking : Boolean := False;
 303    --  GNAT
 304    --  Set True to force the run time to raise Program_Error if calls to
 305    --  potentially blocking operations are detected from protected actions.
 306
 307    Display_Compilation_Progress : Boolean := False;
 308    --  GNATMAKE
 309    --  Set True (-d switch) to display information on progress while compiling
 310    --  files. Internal flag to be used in conjunction with an IDE (e.g GPS).
 311
 312    type Distribution_Stub_Mode_Type is
 313    --  GNAT
 314      (No_Stubs,
 315       --  Normal mode, no generation/compilation of distribution stubs
 316
 317       Generate_Receiver_Stub_Body,
 318       --  The unit being compiled is the RCI body, and the compiler will
 319       --  generate the body for the receiver stubs and compile it.
 320
 321       Generate_Caller_Stub_Body);
 322       --  The unit being compiled is the RCI spec, and the compiler will
 323       --  generate the body for the caller stubs and compile it.
 324
 325    Distribution_Stub_Mode : Distribution_Stub_Mode_Type := No_Stubs;
 326    --  GNAT
 327    --  This enumeration variable indicates the five states of distribution
 328    --  annex stub generation/compilation.
 329
 330    Do_Not_Execute : Boolean := False;
 331    --  GNATMAKE
 332    --  Set to True if no actual compilations should be undertaken.
 333
 334    Dynamic_Elaboration_Checks : Boolean := False;
 335    --  GNAT
 336    --  Set True for dynamic elaboration checking mode, as set by the -gnatE
 337    --  switch or by the use of pragma Elaboration_Checks (Dynamic).
 338
 339    Elab_Dependency_Output : Boolean := False;
 340    --  GNATBIND
 341    --  Set to True to output complete list of elaboration constraints
 342
 343    Elab_Order_Output : Boolean := False;
 344    --  GNATBIND
 345    --  Set to True to output chosen elaboration order
 346
 347    Elab_Warnings : Boolean := False;
 348    --  GNAT
 349    --  Set to True to generate full elaboration warnings (-gnatwl)
 350
 351    Enable_Overflow_Checks : Boolean := False;
 352    --  GNAT
 353    --  Set to True if -gnato (enable overflow checks) switch is set,
 354    --  but not -gnatp.
 355
 356    Exception_Locations_Suppressed : Boolean := False;
 357    --  GNAT
 358    --  This flag is set True if a Suppress_Exception_Locations configuration
 359    --  pragma is currently active.
 360
 361    type Exception_Mechanism_Type is
 362    --  Determines the handling of exceptions. See Exp_Ch11 for details
 363    --
 364      (Front_End_Setjmp_Longjmp_Exceptions,
 365       --  Exceptions use setjmp/longjmp generated explicitly by the
 366       --  front end (this includes gigi or other equivalent parts of
 367       --  the code generator). AT END handlers are converted into
 368       --  exception handlers by the front end in this mode.
 369
 370       Front_End_ZCX_Exceptions,
 371       --  Exceptions use the zero cost table mechanism with explicit
 372       --  tables and exception regions generated by the front end.
 373       --  AT END handlers are converted into exception handlers by
 374       --  the front end in this mode.
 375
 376       Back_End_ZCX_Exceptions);
 377       --  Exceptions are handled by the back end. The front end simply
 378       --  generates the handlers as they appear in the source, and AT
 379       --  END handlers are left untouched (they are not converted into
 380       --  exception handlers when operating in this mode. Note that the
 381       --  name includes ZCX, since the expectation is that the back end
 382       --  mechanism will in fact be a ZCX approach, but nothing in the
 383       --  compiler depends on this, so for example if GNAT is run with
 384       --  a version of GCC configured for setjmp/longjmp exception handling,
 385       --  then everything will work fine.
 386    pragma Convention (C, Exception_Mechanism_Type);
 387
 388    Exception_Mechanism : Exception_Mechanism_Type :=
 389                            Front_End_Setjmp_Longjmp_Exceptions;
 390    --  GNAT
 391    --  Set to the appropriate value depending on the default as given in
 392    --  system.ads (ZCX_By_Default, GCC_ZCX_Support, Front_End_ZCX_Support) and
 393    --  the use of -gnatL -gnatZ (and -gnatdX). The C convention is there to
 394    --  make this variable accessible to gigi.
 395
 396    Exception_Tracebacks : Boolean := False;
 397    --  GNATBIND
 398    --  Set to True to store tracebacks in exception occurrences (-E)
 399
 400    Extensions_Allowed : Boolean := False;
 401    --  GNAT
 402    --  Set to True by switch -gnatX if GNAT specific language extensions
 403    --  are allowed. For example, "limited with" is a GNAT extension.
 404
 405    type External_Casing_Type is (
 406      As_Is,       -- External names cased as they appear in the Ada source
 407      Uppercase,   -- External names forced to all uppercase letters
 408      Lowercase);  -- External names forced to all lowercase letters
 409
 410    External_Name_Imp_Casing : External_Casing_Type := Lowercase;
 411    --  GNAT
 412    --  The setting of this flag determines the casing of external names
 413    --  when the name is implicitly derived from an entity name (i.e. either
 414    --  no explicit External_Name or Link_Name argument is used, or, in the
 415    --  case of extended DEC pragmas, the external name is given using an
 416    --  identifier. The As_Is setting is not permitted here (since this would
 417    --  create Ada source programs that were case sensitive).
 418
 419    External_Name_Exp_Casing : External_Casing_Type := As_Is;
 420    --  GNAT
 421    --  The setting of this flag determines the casing of an external name
 422    --  specified explicitly with a string literal. As_Is means the string
 423    --  literal is used as given with no modification to the casing. If
 424    --  Lowercase or Uppercase is set, then the string is forced to all
 425    --  lowercase or all uppercase letters as appropriate. Note that this
 426    --  setting has no effect if the external name is given using an identifier
 427    --  in the case of extended DEC import/export pragmas (in this case the
 428    --  casing is controlled by External_Name_Imp_Casing), and also has no
 429    --  effect if an explicit Link_Name is supplied (a link name is always
 430    --  used exactly as given).
 431
 432    External_Unit_Compilation_Allowed : Boolean := False;
 433    --  GNATMAKE
 434    --  When True (set by gnatmake switch -x), allow compilation of sources
 435    --  that are not part of any project file.
 436
 437    Float_Format : Character := ' ';
 438    --  GNAT
 439    --  A non-blank value indicates that a Float_Format pragma has been
 440    --  processed, in which case this variable is set to 'I' for IEEE or
 441    --  to 'V' for VAX. The setting of 'V' is only possible on OpenVMS
 442    --  versions of GNAT.
 443
 444    Float_Format_Long : Character := ' ';
 445    --  GNAT
 446    --  A non-blank value indicates that a Long_Float pragma has been
 447    --  processed (this pragma is recognized only in OpenVMS versions
 448    --  of GNAT), in which case this variable is set to D or G for
 449    --  D_Float or G_Float.
 450
 451    Force_ALI_Tree_File : Boolean := False;
 452    --  GNAT
 453    --  Force generation of ALI file even if errors are encountered.
 454    --  Also forces generation of tree file if -gnatt is also set.
 455
 456    Force_Checking_Of_Elaboration_Flags : Boolean := False;
 457    --  GNATBIND
 458    --  True if binding with forced checking of the elaboration flags
 459    --  (-F switch set).
 460
 461    Force_Compilations : Boolean := False;
 462    --  GNATMAKE
 463    --  Set to force recompilations even when the objects are up-to-date.
 464
 465    Full_Path_Name_For_Brief_Errors : Boolean := False;
 466    --  GNAT, GNATMAKE, GNATCLEAN
 467    --  When True, in Brief_Output mode, each error message line
 468    --  will start with the full path name of the source.
 469    --  When False, only the file name without directory information
 470    --  is used.
 471
 472    Full_List : Boolean := False;
 473    --  GNAT
 474    --  Set True to generate full source listing with embedded errors
 475
 476    function get_gcc_version return Int;
 477    pragma Import (C, get_gcc_version, "get_gcc_version");
 478
 479    GCC_Version : constant Nat := get_gcc_version;
 480    --  GNATMAKE
 481    --  Indicates which version of gcc is in use (2 = 2.8.1, 3 = 3.x)
 482
 483    Global_Discard_Names : Boolean := False;
 484    --  GNAT, GNATBIND
 485    --  Set true if a pragma Discard_Names applies to the current unit
 486
 487    GNAT_Mode : Boolean := False;
 488    --  GNAT
 489    --  True if compiling in GNAT system mode (-gnatg switch)
 490
 491    HLO_Active : Boolean := False;
 492    --  GNAT
 493    --  True if High Level Optimizer is activated (-gnatH switch)
 494
 495    Implementation_Unit_Warnings : Boolean := True;
 496    --  GNAT
 497    --  Set True to active warnings for use of implementation internal units.
 498    --  Can be controlled by use of -gnatwi/-gnatwI.
 499
 500    Identifier_Character_Set : Character;
 501    --  GNAT
 502    --  This variable indicates the character set to be used for identifiers.
 503    --  The possible settings are:
 504    --    '1'  Latin-5 (ISO-8859-1)
 505    --    '2'  Latin-5 (ISO-8859-2)
 506    --    '3'  Latin-5 (ISO-8859-3)
 507    --    '4'  Latin-5 (ISO-8859-4)
 508    --    '5'  Latin-5 (ISO-8859-5, Cyrillic)
 509    --    '9'  Latin-5 (ISO-8859-9)
 510    --    'p'  PC (US, IBM page 437)
 511    --    '8'  PC (European, IBM page 850)
 512    --    'f'  Full upper set (all distinct)
 513    --    'n'  No upper characters (Ada 83 rules)
 514    --    'w'  Latin-1 plus wide characters allowed in identifiers
 515    --
 516    --  The setting affects the set of letters allowed in identifiers and the
 517    --  upper/lower case equivalences. It does not affect the interpretation of
 518    --  character and string literals, which are always stored using the actual
 519    --  coding in the source program. This variable is initialized to the
 520    --  default value appropriate to the system (in Osint.Initialize), and then
 521    --  reset if a command line switch is used to change the setting.
 522
 523    Ineffective_Inline_Warnings : Boolean := False;
 524    --  GNAT
 525    --  Set True to activate warnings if front-end inlining (-gnatN) is not
 526    --  able to actually inline a particular call (or all calls). Can be
 527    --  controlled by use of -gnatwp/-gnatwP.
 528
 529    Init_Or_Norm_Scalars : Boolean := False;
 530    --  GNAT, GANTBIND
 531    --  Set True if a pragma Initialize_Scalars applies to the current unit.
 532    --  Also set True if a pragma Normalize_Scalars applies.
 533
 534    Initialize_Scalars : Boolean := False;
 535    --  GNAT
 536    --  Set True if a pragma Initialize_Scalars applies to the current unit.
 537    --  Note that Init_Or_Norm_Scalars is also set to True if this is True.
 538
 539    Initialize_Scalars_Mode1 : Character := 'I';
 540    Initialize_Scalars_Mode2 : Character := 'N';
 541    --  GNATBIND
 542    --  Set to two characters from -S switch (IN/LO/HI/EV/xx). The default
 543    --  is IN (invalid values), used if no -S switch is used.
 544
 545    Inline_Active : Boolean := False;
 546    --  GNAT
 547    --  Set True to activate pragma Inline processing across modules. Default
 548    --  for now is not to inline across module boundaries.
 549
 550    Interface_Library_Unit : Boolean := False;
 551    --  GNATBIND
 552    --  Set to True to indicate that at least one ALI file is an interface ALI:
 553    --  then elaboration flag checks are to be generated in the binder
 554    --  generated file.
 555
 556    Follow_Links : Boolean := False;
 557    --  GNATMAKE
 558    --  Set to True (-eL) to process the project files in trusted mode
 559
 560    Front_End_Inlining : Boolean := False;
 561    --  GNAT
 562    --  Set True to activate inlining by front-end expansion
 563
 564    Inline_Processing_Required : Boolean := False;
 565    --  GNAT
 566    --  Set True if inline processing is required. Inline processing is
 567    --  required if an active Inline pragma is processed. The flag is set
 568    --  for a pragma Inline or Inline_Always that is actually active.
 569
 570    In_Place_Mode : Boolean := False;
 571    --  GNATMAKE
 572    --  Set True to store ALI and object files in place ie in the object
 573    --  directory if these files already exist or in the source directory
 574    --  if not.
 575
 576    Keep_Going : Boolean := False;
 577    --  GNATMAKE
 578    --  When True signals gnatmake to ignore compilation errors and keep
 579    --  processing sources until there is no more work.
 580
 581    Keep_Temporary_Files : Boolean := False;
 582    --  GNATCMD
 583    --  When True the temporary files created by the GNAT driver are not
 584    --  deleted. Set by switch -dn or qualifier /KEEP_TEMPORARY_FILES.
 585
 586    Link_Only : Boolean := False;
 587    --  GNATMAKE
 588    --  Set to True to skip compile and bind steps
 589    --  (except when Bind_Only is set to True).
 590
 591    List_Restrictions : Boolean := False;
 592    --  GNATBIND
 593    --  Set to True to list restrictions pragmas that could apply to partition
 594
 595    List_Units : Boolean := False;
 596    --  GNAT
 597    --  List units in the active library for a compilation (-gnatu switch)
 598
 599    List_Dependencies : Boolean := False;
 600    --  GNATMAKE
 601    --  When True gnatmake verifies that the objects are up to date and
 602    --  outputs the list of object dependencies (-M switch).
 603    --  Output depends if -a switch is used or not.
 604    --  This list can be used directly in a Makefile.
 605
 606    List_Representation_Info : Int range 0 .. 3 := 0;
 607    --  GNAT
 608    --  Set non-zero by -gnatR switch to list representation information.
 609    --  The settings are as follows:
 610    --
 611    --    0 = no listing of representation information (default as above)
 612    --    1 = list rep info for user defined record and array types
 613    --    2 = list rep info for all user defined types and objects
 614    --    3 = like 2, but variable fields are decoded symbolically
 615
 616    List_Representation_Info_To_File : Boolean := False;
 617    --  GNAT
 618    --  Set true by -gnatRs switch. Causes information from -gnatR/1/2/3
 619    --  to be written to file.rep (where file is the name of the source
 620    --  file) instead of stdout. For example, if file x.adb is compiled
 621    --  using -gnatR2s then representation info is written to x.adb.ref.
 622
 623    List_Representation_Info_Mechanisms : Boolean := False;
 624    --  GNAT
 625    --  Set true by -gnatRm switch. Causes information on mechanisms to
 626    --  be included in the representation output information.
 627
 628    List_Preprocessing_Symbols : Boolean := False;
 629    --  GNAT, GNATPREP
 630    --  Set to True if symbols for preprocessing a source are to be listed
 631    --  before preprocessing occurs. Set to True by switch -s of gnatprep
 632    --  or -s in preprocessing data file for the compiler.
 633
 634    type Creat_Repinfo_File_Proc is access procedure (Src : File_Name_Type);
 635    type Write_Repinfo_Line_Proc is access procedure (Info : String);
 636    type Close_Repinfo_File_Proc is access procedure;
 637    --  Types used for procedure addresses below
 638
 639    Creat_Repinfo_File_Access : Creat_Repinfo_File_Proc := null;
 640    Write_Repinfo_Line_Access : Write_Repinfo_Line_Proc := null;
 641    Close_Repinfo_File_Access : Close_Repinfo_File_Proc := null;
 642    --  GNAT
 643    --  These three locations are left null when operating in non-compiler
 644    --  (e.g. ASIS mode), but when operating in compiler mode, they are
 645    --  set to point to the three corresponding procedures in Osint. The
 646    --  reason for this slightly strange interface is to prevent Repinfo
 647    --  from dragging in Osint in ASIS mode, which would include a lot of
 648    --  unwanted units in the ASIS build.
 649
 650    Locking_Policy : Character := ' ';
 651    --  GNAT, GNATBIND
 652    --  Set to ' ' for the default case (no locking policy specified).
 653    --  Reset to first character (uppercase) of locking policy name if a
 654    --  valid pragma Locking_Policy is encountered.
 655
 656    Locking_Policy_Sloc : Source_Ptr := No_Location;
 657    --  GNAT, GNATBIND
 658    --  Remember location of previous Locking_Policy pragma. This is used
 659    --  for inconsistency error messages. A value of System_Location is
 660    --  used if the policy is set in package System.
 661
 662    Look_In_Primary_Dir : Boolean := True;
 663    --  GNAT, GNATBIND, GNATMAKE, GNATCLEAN
 664    --  Set to False if a -I- was present on the command line.
 665    --  When True we are allowed to look in the primary directory to locate
 666    --  other source or library files.
 667
 668    Make_Steps : Boolean := False;
 669    --  GNATMAKE
 670    --  Set to True when either Compile_Only, Bind_Only or Link_Only is
 671    --  set to True.
 672
 673    Main_Index : Int := 0;
 674    --  GNATMAKE
 675    --  This is set to non-zero by gnatmake switch -eInnn to indicate that
 676    --  the main program is the nnn unit in a multi-unit source file.
 677
 678    Mapping_File_Name : String_Ptr := null;
 679    --  GNAT
 680    --  File name of mapping between unit names, file names and path names.
 681    --  (given by switch -gnatem)
 682
 683    Maximum_Errors : Int := 9999;
 684    --  GNAT, GNATBIND
 685    --  Maximum default number of errors before compilation is terminated.
 686    --  Can be overridden using -gnatm (GNAT) or -m (GNATBIND) switch.
 687
 688    Maximum_File_Name_Length : Int;
 689    --  GNAT, GNATBIND
 690    --  Maximum number of characters allowed in a file name, not counting the
 691    --  extension, as set by the appropriate switch. If no switch is given,
 692    --  then this value is initialized by Osint to the appropriate value.
 693
 694    Max_Line_Length : Int := Hostparm.Max_Line_Length;
 695    --  This is a copy of Max_Line_Length used by the scanner. It is usually
 696    --  set to be a copy of Hostparm.Max_Line_Length, and is used to check
 697    --  the maximum line length in the scanner when style checking is inactive.
 698    --  The only time it is set to a different value is during the scanning of
 699    --  configuration pragma files, where we want to turn off all checking and
 700    --  in particular we want to allow long lines. So we reset this value to
 701    --  Column_Number'Last during scanning of configuration pragma files.
 702
 703    Maximum_Processes : Positive := 1;
 704    --  GNATMAKE
 705    --  Maximum number of processes that should be spawned to carry out
 706    --  compilations.
 707
 708    Minimal_Recompilation : Boolean := False;
 709    --  GNATMAKE
 710    --  Set to True if minimal recompilation mode requested
 711
 712    Multiple_Unit_Index : Int;
 713    --  GNAT
 714    --  This is set non-zero if the current unit is being compiled in multiple
 715    --  unit per file mode, meaning that the current unit is selected from the
 716    --  sequence of units in the current source file, using the value stored
 717    --  in this variable (e.g. 2 = select second unit in file). A value of
 718    --  zero indicates that we are in normal (one unit per file) mode.
 719
 720    No_Main_Subprogram : Boolean := False;
 721    --  GNATMAKE, GNATBIND
 722    --  Set to True if compilation/binding of a program without main
 723    --  subprogram requested.
 724
 725    No_Run_Time_Mode : Boolean := False;
 726    --  GNAT, GNATBIND
 727    --  This flag is set True if a No_Run_Time pragma is encountered. See
 728    --  spec of Rtsfind for a full description of handling of this pragma.
 729
 730    No_Stdinc : Boolean := False;
 731    --  GNAT, GNATBIND, GNATMAKE, GNATFIND, GNATXREF
 732    --  Set to True if no default source search dirs added to search list
 733
 734    No_Stdlib : Boolean := False;
 735    --  GNATMAKE, GNATBIND, GNATFIND, GNATXREF
 736    --  Set to True if no default library search dirs added to search list
 737
 738    No_Strict_Aliasing : Boolean := False;
 739    --  GNAT
 740    --  Set True if pragma No_Strict_Aliasing with no parameters encountered
 741
 742    Normalize_Scalars : Boolean := False;
 743    --  GNAT, GNATBIND
 744    --  Set True if a pragma Normalize_Scalars applies to the current unit.
 745    --  Note that Init_Or_Norm_Scalars is also set to True if this is True.
 746
 747    Object_Directory_Present : Boolean := False;
 748    --  GNATMAKE
 749    --  Set to True when an object directory is specified with option -D
 750
 751    type Operating_Mode_Type is (Check_Syntax, Check_Semantics, Generate_Code);
 752    Operating_Mode : Operating_Mode_Type := Generate_Code;
 753    --  GNAT
 754    --  Indicates the operating mode of the compiler. The default is generate
 755    --  code, which runs the parser, semantics and backend. Switches can be
 756    --  used to set syntax checking only mode, or syntax and semantics checking
 757    --  only mode. Operating_Mode can also be modified as a result of detecting
 758    --  errors during the compilation process. In particular if any serious
 759    --  error is detected then this flag is reset from Generate_Code to
 760    --  Check_Semantics after generating an error message.
 761
 762    Original_Operating_Mode : Operating_Mode_Type := Generate_Code;
 763    --  GNAT
 764    --  Indicates the original operating mode of the compiler as set by
 765    --  compiler options. This is identical to Operating_Mode except that
 766    --  this is not affected by errors.
 767
 768    Optimization_Level : Int;
 769    pragma Import (C, Optimization_Level, "optimize");
 770    --  This constant reflects the optimization level (0,1,2 for -O0,-O1,-O2)
 771
 772    Output_File_Name_Present : Boolean := False;
 773    --  GNATBIND, GNAT, GNATMAKE
 774    --  Set to True when the output C file name is given with option -o
 775    --  for GNATBIND, when the object file name is given with option
 776    --  -gnatO for GNAT or when the executable is given with option -o
 777    --  for GNATMAKE.
 778
 779    Output_Linker_Option_List : Boolean := False;
 780    --  GNATBIND
 781    --  True if output of list of linker options is requested (-K switch set)
 782
 783    Output_Object_List : Boolean := False;
 784    --  GNATBIND
 785    --  True if output of list of objects is requested (-O switch set)
 786
 787    Persistent_BSS_Mode : Boolean := False;
 788    --  GNAT
 789    --  True if a Persistent_BSS configuration pragma is in effect, causing
 790    --  potentially persistent data to be placed in the persistent_bss section.
 791
 792    Pessimistic_Elab_Order : Boolean := False;
 793    --  GNATBIND
 794    --  True if pessimistic elaboration order is to be chosen (-p switch set)
 795
 796    Polling_Required : Boolean := False;
 797    --  GNAT
 798    --  Set to True if polling for asynchronous abort is enabled by using
 799    --  the -gnatP option for GNAT.
 800
 801    Preprocessing_Data_File : String_Ptr := null;
 802    --  GNAT
 803    --  Set by switch -gnatep=. The file name of the prepocessing data file.
 804
 805    Print_Generated_Code : Boolean := False;
 806    --  GNAT
 807    --  Set to True to enable output of generated code in source form. This
 808    --  flag is set by the -gnatG switch.
 809
 810    Print_Standard : Boolean := False;
 811    --  GNAT
 812    --  Set to true to enable printing of package standard in source form.
 813    --  This flag is set by the -gnatS switch
 814
 815    Propagate_Exceptions : Boolean := False;
 816    --  GNAT
 817    --  Indicates if subprogram descriptor exception tables should be
 818    --  built for imported subprograms. Set True if a Propagate_Exceptions
 819    --  pragma applies to the extended main unit.
 820
 821    type Usage is (Unknown, Not_In_Use, In_Use);
 822    Project_File_In_Use : Usage := Unknown;
 823    --  GNAT
 824    --  Indicates if a project file is used or not.
 825    --  Set to In_Use by the first SFNP pragma.
 826
 827    Queuing_Policy : Character := ' ';
 828    --  GNAT, GNATBIND
 829    --  Set to ' ' for the default case (no queuing policy specified).
 830    --  Reset to first character (uppercase) of locking policy name if a valid
 831    --  Queuing_Policy pragma is encountered.
 832
 833    Queuing_Policy_Sloc : Source_Ptr := No_Location;
 834    --  GNAT, GNATBIND
 835    --  Remember location of previous Queuing_Policy pragma. This is used
 836    --  for inconsistency error messages. A value of System_Location is
 837    --  used if the policy is set in package System.
 838
 839    Quiet_Output : Boolean := False;
 840    --  GNATMAKE, GNATCLEAN, GPR2MAKE
 841    --  Set to True if the tool should not have any output if there are no
 842    --  errors or warnings.
 843
 844    RTS_Lib_Path_Name : String_Ptr := null;
 845    RTS_Src_Path_Name : String_Ptr := null;
 846    --  GNAT
 847    --  Set to the "adalib" and "adainclude" directories of the run time
 848    --  specified by --RTS=.
 849
 850    RTS_Switch : Boolean := False;
 851    --  GNAT, GNATMAKE, GNATBIND, GNATLS, GNATFIND, GNATXREF
 852    --  Set to True when the --RTS switch is set
 853
 854    Run_Path_Option : Boolean := True;
 855    --  GNATMAKE, GNATLINK
 856    --  Set to False when no run_path_option should be issued to the linker
 857
 858    Sec_Stack_Used : Boolean := False;
 859    --  GNAT, GBATBIND
 860    --  Set True if generated code uses the System.Secondary_Stack package.
 861    --  For the binder, set if any unit uses the secondary stack package.
 862
 863    Setup_Projects : Boolean := False;
 864    --  GNAT DRIVER
 865    --  Set to True for GNAT SETUP: the Project Manager creates non existing
 866    --  object, library and exec directories.
 867
 868    Shared_Libgnat : Boolean;
 869    --  GNATBIND
 870    --  Set to True if a shared libgnat is requested by using the -shared
 871    --  option for GNATBIND and to False when using the -static option. The
 872    --  value of this flag is set by Gnatbind.Scan_Bind_Arg.
 873
 874    Stack_Checking_Enabled : Boolean;
 875    --  GNAT
 876    --  Set to indicate if -fstack-check switch is set for the compilation. True
 877    --  means that the switch is set, so that stack checking is enabled. False
 878    --  means that the switch is not set (no stack checking). This value is
 879    --  obtained from the external imported value flag_stack_check in the gcc
 880    --  backend (see Frontend) and may be referenced throughout the compilation
 881    --  phases.
 882
 883    Style_Check : Boolean := False;
 884    --  GNAT
 885    --  Set True to perform style checks. Activates checks carried out
 886    --  in package Style (see body of this package for details of checks)
 887    --  This flag is set True by either the -gnatg or -gnaty switches.
 888
 889    System_Extend_Pragma_Arg : Node_Id := Empty;
 890    --  GNAT
 891    --  Set non-empty if and only if a correct Extend_System pragma was present
 892    --  in which case it points to the argument of the pragma, and the name can
 893    --  be located as Chars (Expression (System_Extend_Pragma_Arg)).
 894
 895    System_Extend_Unit : Node_Id := Empty;
 896    --  GNAT
 897    --  This is set to Empty if GNAT_Mode is set, since pragma Extend_System
 898    --  is never appropriate in GNAT_Mode (and causes troubles, including
 899    --  bogus circularities, if we try to compile the run-time library with
 900    --  a System extension). If GNAT_Mode is not set, then System_Extend_Unit
 901    --  is a copy of the value set in System_Extend_Pragma_Arg.
 902
 903    Subunits_Missing : Boolean := False;
 904    --  GNAT
 905    --  This flag is set true if missing subunits are detected with code
 906    --  generation active. This causes code generation to be skipped.
 907
 908    Suppress_Checks : Boolean := False;
 909    --  GNAT
 910    --  Set to True if -gnatp (suppress all checks) switch present.
 911
 912    Suppress_Options : Suppress_Array;
 913    --  GNAT
 914    --  Flags set True to suppress corresponding check, i.e. add an implicit
 915    --  pragma Suppress at the outer level of each unit compiled. Note that
 916    --  these suppress actions can be overridden by the use of the Unsuppress
 917    --  pragma. This variable is initialized by Osint.Initialize.
 918
 919    Suppress_Back_Annotation : Boolean := False;
 920    --  GNAT
 921    --  This flag is set True if back annotation of representation information
 922    --  is to be suppressed. This is set if neither -gnatt or -gnatR0-3 is set.
 923    --  This avoids unnecessary time being spent on back annotation.
 924
 925    Table_Factor : Int := 1;
 926    --  GNAT
 927    --  Factor by which all initial table sizes set in Alloc are multiplied.
 928    --  Used in Table to calculate initial table sizes (the initial table size
 929    --  is the value in Alloc, used as the Table_Initial parameter value,
 930    --  multiplied by the factor given here. The default value is used if no
 931    --  -gnatT switch appears.
 932
 933    Task_Dispatching_Policy : Character := ' ';
 934    --  GNAT, GNATBIND
 935    --  Set to ' ' for the default case (no task dispatching policy specified).
 936    --  Reset to first character (uppercase) of task dispatching policy name
 937    --  if a valid Task_Dispatching_Policy pragma is encountered.
 938
 939    Task_Dispatching_Policy_Sloc : Source_Ptr := No_Location;
 940    --  GNAT, GNATBIND
 941    --  Remember location of previous Task_Dispatching_Policy pragma. This is
 942    --  used for inconsistency error messages. A value of System_Location is
 943    --  used if the policy is set in package System.
 944
 945    Tasking_Used : Boolean := False;
 946    --  Set True if any tasking construct is encountered. Used to activate the
 947    --  output of the Q, L and T lines in ALI files.
 948
 949    Time_Slice_Set : Boolean := False;
 950    --  GNATBIND
 951    --  Set True if a pragma Time_Slice is processed in the main unit, or
 952    --  if the -gnatTnn switch is present to set a time slice value.
 953
 954    Time_Slice_Value : Nat;
 955    --  GNATBIND
 956    --  Time slice value. Valid only if Time_Slice_Set is True, i.e. if
 957    --  Time_Slice pragma has been processed. Set to the time slice value in
 958    --  microseconds. Negative values are stored as zero, and the value is not
 959    --  larger than 1_000_000_000 (1000 seconds). Values larger than this are
 960    --  reset to this maximum. This can also be set with the -gnatTnn switch.
 961
 962    Tolerate_Consistency_Errors : Boolean := False;
 963    --  GNATBIND
 964    --  Tolerate time stamp and other consistency errors. If this flag is set to
 965    --  True (-t), then inconsistencies result in warnings rather than errors.
 966
 967    Tree_Output : Boolean := False;
 968    --  GNAT
 969    --  Set to True (-gnatt) to generate output tree file
 970
 971    Try_Semantics : Boolean := False;
 972    --  GNAT
 973    --  Flag set to force attempt at semantic analysis, even if parser errors
 974    --  occur. This will probably cause blowups at this stage in the game. On
 975    --  the other hand, most such blowups will be caught cleanly and simply
 976    --  say compilation abandoned. This flag is set to True by -gnatq or -gnatQ.
 977
 978    Undefined_Symbols_Are_False : Boolean := False;
 979    --  GNAT, GNATPREP
 980    --  Set to True by switch -u of gnatprep or -u in the preprocessing data
 981    --  file for the compiler. Indicates that while preprocessing sources,
 982    --  symbols that are not defined have the value FALSE.
 983
 984    Unique_Error_Tag : Boolean := Tag_Errors;
 985    --  GNAT
 986    --  Indicates if error messages are to be prefixed by the string error:
 987    --  Initialized from Tag_Errors, can be forced on with the -gnatU switch.
 988
 989    Universal_Addressing_On_AAMP : Boolean := False;
 990    --  GNAAMP
 991    --  Indicates if library-level objects should be accessed and updated using
 992    --  universal addressing instructions on the AAMP architecture. This flag is
 993    --  set to True when pragma Universal_Data is given as a configuration
 994    --  pragma.
 995
 996    Unreserve_All_Interrupts : Boolean := False;
 997    --  GNAT, GNATBIND
 998    --  Normally set False, set True if a valid Unreserve_All_Interrupts pragma
 999    --  appears anywhere in the main unit for GNAT, or if any ALI file has the
1000    --  corresponding attribute set in GNATBIND.
1001
1002    Upper_Half_Encoding : Boolean := False;
1003    --  GNAT
1004    --  Normally set False, indicating that upper half ASCII characters are
1005    --  used in the normal way to represent themselves. If the wide character
1006    --  encoding method uses the upper bit for this encoding, then this flag is
1007    --  set True, and upper half characters in the source indicate the start of
1008    --  a wide character sequence.
1009
1010    Usage_Requested : Boolean := False;
1011    --  GNAT, GNATBIND, GNATMAKE
1012    --  Set to True if -h (-gnath for the compiler) switch encountered
1013    --  requesting usage information
1014
1015    Use_VADS_Size : Boolean := False;
1016    --  GNAT
1017    --  Set to True if a valid pragma Use_VADS_Size is processed
1018
1019    Validity_Checks_On  : Boolean := True;
1020    --  GNAT
1021    --  This flag determines if validity checking is on or off. The initial
1022    --  state is on, and the required default validity checks are active. The
1023    --  actual set of checks that is performed if Validity_Checks_On is set is
1024    --  defined by the switches in package Sem_Val. The Validity_Checks_On flag
1025    --  is controlled by pragma Validity_Checks (On | Off), and also some
1026    --  generated compiler code (typically code that has to do with validity
1027    --  check generation) is compiled with this flag set to False. This flag is
1028    --  set to False by the -gnatp switch.
1029
1030    Verbose_Mode : Boolean := False;
1031    --  GNAT, GNATBIND, GNATMAKE, GNATLINK, GNATLS, GNATNAME, GNATCLEAN
1032    --  Set to True to get verbose mode (full error message text and location
1033    --  information sent to standard output, also header, copyright and summary)
1034
1035    Warn_On_Ada_2005_Compatibility : Boolean := True;
1036    --  GNAT
1037    --  Set to True to active all warnings on Ada 2005 compatibility issues,
1038    --  including warnings on Ada 2005 obsolescent features used in Ada 2005
1039    --  mode. Set False by -gnatwY.
1040
1041    Warn_On_Bad_Fixed_Value : Boolean := False;
1042    --  GNAT
1043    --  Set to True to generate warnings for static fixed-point expression
1044    --  values that are not an exact multiple of the small value of the type.
1045
1046    Warn_On_Constant : Boolean := False;
1047    --  GNAT
1048    --  Set to True to generate warnings for variables that could be declared
1049    --  as constants. Modified by use of -gnatwk/K.
1050
1051    Warn_On_Dereference : Boolean := False;
1052    --  GNAT
1053    --  Set to True to generate warnings for implicit dereferences for array
1054    --  indexing and record component access. Modified by use of -gnatwd/D.
1055
1056    Warn_On_Export_Import : Boolean := True;
1057    --  GNAT
1058    --  Set to True to generate warnings for suspicious use of export or
1059    --  import pragmas. Modified by use of -gnatwx/X.
1060
1061    Warn_On_Hiding : Boolean := False;
1062    --  GNAT
1063    --  Set to True to generate warnings if a declared entity hides another
1064    --  entity. The default is that this warning is suppressed.
1065
1066    Warn_On_Modified_Unread : Boolean := False;
1067    --  GNAT
1068    --  Set to True to generate warnings if a variable is assigned but is never
1069    --  read. The default is that this warning is suppressed.
1070
1071    Warn_On_No_Value_Assigned : Boolean := True;
1072    --  GNAT
1073    --  Set to True to generate warnings if no value is ever assigned to a
1074    --  variable that is at least partially uninitialized. Set to false to
1075    --  suppress such warnings. The default is that such warnings are enabled.
1076
1077    Warn_On_Obsolescent_Feature : Boolean := False;
1078    --  GNAT
1079    --  Set to True to generate warnings on use of any feature in Annex or if a
1080    --  subprogram is called for which a pragma Obsolescent applies.
1081
1082    Warn_On_Redundant_Constructs : Boolean := False;
1083    --  GNAT
1084    --  Set to True to generate warnings for redundant constructs (e.g. useless
1085    --  assignments/conversions). The default is that this warning is disabled.
1086
1087    Warn_On_Unchecked_Conversion : Boolean := True;
1088    --  GNAT
1089    --  Set to True to generate warnings for unchecked conversions that may have
1090    --  non-portable semantics (e.g. because sizes of types differ). The default
1091    --  is that this warning is enabled.
1092
1093    Warn_On_Unrecognized_Pragma : Boolean := True;
1094    --  GNAT
1095    --  Set to True to generate warnings for unrecognized pragmas. The default
1096    --  is that this warning is enabled.
1097
1098    type Warning_Mode_Type is (Suppress, Normal, Treat_As_Error);
1099    Warning_Mode : Warning_Mode_Type := Normal;
1100    --  GNAT, GNATBIND
1101    --  Controls treatment of warning messages. If set to Suppress, warning
1102    --  messages are not generated at all. In Normal mode, they are generated
1103    --  but do not count as errors. In Treat_As_Error mode, warning messages
1104    --  are generated and are treated as errors.
1105
1106    Wide_Character_Encoding_Method : WC_Encoding_Method := WCEM_Brackets;
1107    --  GNAT
1108    --  Method used for encoding wide characters in the source program. See
1109    --  description of type in unit System.WCh_Con for a list of the methods
1110    --  that are currently supported. Note that brackets notation is always
1111    --  recognized in source programs regardless of the setting of this
1112    --  variable. The default setting causes only the brackets notation to be
1113    --  recognized. If this is the main unit, this setting also controls the
1114    --  output of the W=? parameter in the ALI file, which is used to provide
1115    --  the default for Wide_Text_IO files.
1116
1117    Xref_Active : Boolean := True;
1118    --  GNAT
1119    --  Set if cross-referencing is enabled (i.e. xref info in ALI files)
1120
1121    Zero_Cost_Exceptions_Val : Boolean;
1122    Zero_Cost_Exceptions_Set : Boolean := False;
1123    --  GNAT
1124    --  These values are to record the setting of the zero cost exception
1125    --  handling mode set by argument switches (-gnatZ/-gnatL). If the value is
1126    --  set by one of these switches, then Zero_Cost_Exceptions_Set is set to
1127    --  True, and Zero_Cost_Exceptions_Val indicates the setting.
1128
1129    ----------------------------
1130    -- Configuration Settings --
1131    ----------------------------
1132
1133    --  These are settings that are used to establish the mode at the start of
1134    --  each unit. The values defined below can be affected either by command
1135    --  line switches, or by the use of appropriate configuration pragmas in the
1136    --  gnat.adc file.
1137
1138    Ada_Version_Config : Ada_Version_Type;
1139    --  GNAT
1140    --  This is the value of the configuration switch for the Ada 83 mode, as
1141    --  set by the command line switches -gnat83/95/05, and possibly modified by
1142    --  the use of configuration pragmas Ada_83/Ada95/Ada05. This switch is used
1143    --  to set the initial value for Ada_Version mode at the start of analysis
1144    --  of a unit. Note however, that the setting of this flag is ignored for
1145    --  internal and predefined units (which are always compiled in the most up
1146    --  to date version of Ada).
1147
1148    Ada_Version_Explicit_Config : Ada_Version_Type;
1149    --  GNAT
1150    --  Same as above but used to initialize Ada_Version_Explicit. Currently
1151    --  this will always have the same value as Ada_Version_Config.
1152
1153    Assertions_Enabled_Config : Boolean;
1154    --  GNAT
1155    --  This is the value of the configuration switch for assertions enabled
1156    --  mode, as possibly set by the command line switch -gnata, and possibly
1157    --  modified by the use of the configuration pragma Assertion_Policy.
1158
1159    Dynamic_Elaboration_Checks_Config : Boolean := False;
1160    --  GNAT
1161    --  Set True for dynamic elaboration checking mode, as set by the -gnatE
1162    --  switch or by the use of pragma Elaboration_Checking (Dynamic).
1163
1164    Exception_Locations_Suppressed_Config : Boolean := False;
1165    --  GNAT
1166    --  Set True by use of the configuration pragma Suppress_Exception_Messages
1167
1168    Extensions_Allowed_Config : Boolean;
1169    --  GNAT
1170    --  This is the flag that indicates whether extensions are allowed. It can
1171    --  be set True either by use of the -gnatX switch, or by use of the
1172    --  configuration pragma Extensions_Allowed (On). It is always set to True
1173    --  for internal GNAT units, since extensions are always permitted in such
1174    --  units.
1175
1176    External_Name_Exp_Casing_Config : External_Casing_Type;
1177    --  GNAT
1178    --  This is the value of the configuration switch that controls casing of
1179    --  external symbols for which an explicit external name is given. It can be
1180    --  set to Uppercase by the command line switch -gnatF, and further modified
1181    --  by the use of the configuration pragma External_Name_Casing in the
1182    --  gnat.adc file. This flag is used to set the initial value for
1183    --  External_Name_Exp_Casing at the start of analyzing each unit. Note
1184    --  however that the setting of this flag is ignored for internal and
1185    --  predefined units (which are always compiled with As_Is mode).
1186
1187    External_Name_Imp_Casing_Config : External_Casing_Type;
1188    --  GNAT
1189    --  This is the value of the configuration switch that controls casing of
1190    --  external symbols where the external name is implicitly given. It can be
1191    --  set to Uppercase by the command line switch -gnatF, and further modified
1192    --  by the use of the configuration pragma External_Name_Casing in the
1193    --  gnat.adc file. This flag is used to set the initial value for
1194    --  External_Name_Imp_Casing at the start of analyzing each unit. Note
1195    --  however that the setting of this flag is ignored for internal and
1196    --  predefined units (which are always compiled with Lowercase mode).
1197
1198    Persistent_BSS_Mode_Config : Boolean;
1199    --  GNAT
1200    --  This is the value of the configuration switch that controls whether
1201    --  potentially persistent data is to be placed in the persistent_bss
1202    --  section. It can be set True by use of the pragma Persistent_BSS.
1203    --  This flag is used to set the initial value of Persistent_BSS_Mode
1204    --  at the start of each compilation unit, except that it is always
1205    --  set False for predefined units.
1206
1207    Polling_Required_Config : Boolean;
1208    --  GNAT
1209    --  This is the value of the configuration switch that controls polling
1210    --  mode. It can be set True by the command line switch -gnatP, and then
1211    --  further modified by the use of pragma Polling in the gnat.adc file. This
1212    --  flag is used to set the initial value for Polling_Required at the start
1213    --  of analyzing each unit.
1214
1215    Use_VADS_Size_Config : Boolean;
1216    --  GNAT
1217    --  This is the value of the configuration switch that controls the use of
1218    --  VADS_Size instead of Size whereever the attribute Size is used. It can
1219    --  be set True by the use of the pragma Use_VADS_Size in the gnat.adc file.
1220    --  This flag is used to set the initial value for Use_VADS_Size at the
1221    --  start of analyzing each unit. Note however that the setting of this flag
1222    --  is ignored for internal and predefined units (which are always compiled
1223    --  with the standard Size semantics).
1224
1225    type Config_Switches_Type is private;
1226    --  Type used to save values of the switches set from Config values
1227
1228    procedure Save_Opt_Config_Switches (Save : out Config_Switches_Type);
1229    --  This procedure saves the current values of the switches which are
1230    --  initialized from the above Config values, and then resets these switches
1231    --  according to the Config value settings.
1232
1233    procedure Set_Opt_Config_Switches (Internal_Unit : Boolean);
1234    --  This procedure sets the switches to the appropriate initial values. The
1235    --  parameter Internal_Unit is True for an internal or predefined unit, and
1236    --  affects the way the switches are set (see above).
1237
1238    procedure Restore_Opt_Config_Switches (Save : Config_Switches_Type);
1239    --  This procedure restores a set of switch values previously saved by a
1240    --  call to Save_Opt_Switches.
1241
1242    procedure Register_Opt_Config_Switches;
1243    --  This procedure is called after processing the gnat.adc file to record
1244    --  the values of the Config switches, as possibly modified by the use of
1245    --  command line switches and configuration pragmas.
1246
1247    ------------------------
1248    -- Other Global Flags --
1249    ------------------------
1250
1251    Expander_Active : Boolean := False;
1252    --  A flag that indicates if expansion is active (True) or deactivated
1253    --  (False). When expansion is deactivated all calls to expander routines
1254    --  have no effect. Note that the initial setting of False is merely to
1255    --  prevent saving of an undefined value for an initial call to the
1256    --  Expander_Mode_Save_And_Set procedure. For more information on the use of
1257    --  this flag, see package Expander. Indeed this flag might more logically
1258    --  be in the spec of Expander, but it is referenced by Errout, and it
1259    --  really seems wrong for Errout to depend on Expander.
1260
1261    -----------------------
1262    -- Tree I/O Routines --
1263    -----------------------
1264
1265    procedure Tree_Read;
1266    --  Reads switch settings from current tree file using Tree_Read
1267
1268    procedure Tree_Write;
1269    --  Writes out switch settings to current tree file using Tree_Write
1270
1271    --------------------------
1272    -- ASIS Version Control --
1273    --------------------------
1274
1275    --  These two variables (Tree_Version_String and Tree_ASIS_Version_Number)
1276    --  are supposed to be used in the GNAT/ASIS version check performed in
1277    --  the ASIS code (this package is also a part of the ASIS implementation).
1278    --  They are set by Tree_Read procedure, so they represent the version
1279    --  number (and the version string) of the compiler which has created the
1280    --  tree, and they are supposed to be compared with the corresponding values
1281    --  from the Gnatvsn package which is a part of ASIS implementation.
1282
1283    Tree_Version_String : String (Gnat_Version_String'Range);
1284    --  Used to store the compiler version string read from a tree file to check
1285    --  if it is the same as stored in the version string in Gnatvsn. Therefore
1286    --  its length is taken directly from the version string in Gnatvsn. If the
1287    --  length of the version string stored in the tree is different, then
1288    --  versions are for sure different, and a string containing '?' characters
1289    --  is assigned to this variable as a result of tree read.
1290
1291    Tree_ASIS_Version_Number : Int;
1292    --  Used to store the ASIS version number read from a tree file to check if
1293    --  it is the same as stored in the ASIS version number in Gnatvsn.
1294
1295 private
1296
1297    type Config_Switches_Type is record
1298       Ada_Version                    : Ada_Version_Type;
1299       Ada_Version_Explicit           : Ada_Version_Type;
1300       Assertions_Enabled             : Boolean;
1301       Dynamic_Elaboration_Checks     : Boolean;
1302       Exception_Locations_Suppressed : Boolean;
1303       Extensions_Allowed             : Boolean;
1304       External_Name_Exp_Casing       : External_Casing_Type;
1305       External_Name_Imp_Casing       : External_Casing_Type;
1306       Persistent_BSS_Mode            : Boolean;
1307       Polling_Required               : Boolean;
1308       Use_VADS_Size                  : Boolean;
1309    end record;
1310
1311 end Opt;