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) 1992-2002, 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,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, 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
  35 --  routine from the command line and referenced throughout the compiler,
  36 --  the binder, gnatmake or other GNAT tools. The comments indicate which
  37 --  options are used by which programs (GNAT, GNATBIND, GNATMAKE, etc).
  38
  39 with Hostparm;       use Hostparm;
  40 with Types;          use Types;
  41 with System.WCh_Con; use System.WCh_Con;
  42
  43 package Opt is
  44
  45    ----------------------------------------------
  46    -- Settings of Modes for Current Processing --
  47    ----------------------------------------------
  48
  49    --  The following mode values represent the current state of processing.
  50    --  The values set here are the default values. Unless otherwise noted,
  51    --  the value may be reset in Switch with an appropropiate switch. In
  52    --  some cases, the values can also be modified by pragmas, and in the
  53    --  case of some binder variables, Gnatbind.Scan_Bind_Arg may modify
  54    --  the default values.
  55
  56    Ada_Bind_File : Boolean := True;
  57    --  GNATBIND, GNATLINK
  58    --  Set True if binder file to be generated in Ada rather than C
  59
  60    Ada_95 : Boolean := True;
  61    --  GNAT
  62    --  Set True if operating in Ada 95 mode
  63    --  Set False if operating in Ada 83 mode
  64
  65    Ada_83 : Boolean := False;
  66    --  GNAT
  67    --  Set True if operating in Ada 83 mode
  68    --  Set False if operating in Ada 95 mode
  69
  70    Ada_Final_Suffix : constant String := "final";
  71    Ada_Final_Name : String_Ptr := new String'("ada" & Ada_Final_Suffix);
  72    --  GNATBIND
  73    --  The name of the procedure that performs the finalization at the end of
  74    --  execution. This variable may be modified by Gnatbind.Scan_Bind_Arg.
  75
  76    Ada_Init_Suffix : constant String := "init";
  77    Ada_Init_Name : String_Ptr := new String'("ada" & Ada_Init_Suffix);
  78    --  GNATBIND
  79    --  The name of the procedure that performs initialization at the start
  80    --  of execution. This variable may be modified by Gnatbind.Scan_Bind_Arg.
  81
  82    Ada_Main_Name_Suffix : constant String := "main";
  83    --  GNATBIND
  84    --  The suffix for Ada_Main_Name. Defined as a constant here so that it
  85    --  can be referenced in a uniform manner to create either the default
  86    --  value of Ada_Main_Name (declared below), or the non-default name
  87    --  set by Gnatbind.Scan_Bind_Arg.
  88
  89    Ada_Main_Name : String_Ptr := new String'("ada_" & Ada_Main_Name_Suffix);
  90    --  GNATBIND
  91    --  The name of the Ada package generated by the binder (when in Ada mode).
  92    --  This variable may be modified by Gnatbind.Scan_Bind_Arg.
  93
  94    Address_Clause_Overlay_Warnings : Boolean := True;
  95    --  GNAT
  96    --  Set False to disable address clause warnings
  97
  98    All_Errors_Mode : Boolean := False;
  99    --  GNAT
 100    --  Flag set to force display of multiple errors on a single line and
 101    --  also repeated error messages for references to undefined identifiers
 102    --  and certain other repeated error messages.
 103
 104    All_Sources : Boolean := False;
 105    --  GNATBIND
 106    --  Set to True to require all source files to be present. This flag is
 107    --  directly modified by gnatmake to affect the shared binder routines.
 108
 109    Alternate_Main_Name : String_Ptr := null;
 110    --  GNATBIND
 111    --  Set to non null when Bind_Alternate_Main_Name is True. This value
 112    --  is modified as needed by Gnatbind.Scan_Bind_Arg.
 113
 114    Assertions_Enabled : Boolean := False;
 115    --  GNAT
 116    --  Enable assertions made using pragma Assert.
 117
 118    Back_Annotate_Rep_Info : Boolean := False;
 119    --  GNAT
 120    --  If set True (by use of -gnatB), enables back annotation of
 121    --  representation information by gigi, even in -gnatc mode.
 122
 123    Bind_Alternate_Main_Name : Boolean := False;
 124    --  GNATBIND
 125    --  True if main should be called Alternate_Main_Name.all.
 126    --  This variable may be set to True by Gnatbind.Scan_Bind_Arg.
 127
 128    Bind_Main_Program : Boolean := True;
 129    --  GNATBIND
 130    --  Set to False if not binding main Ada program.
 131
 132    Bind_For_Library : Boolean := False;
 133    --  GNATBIND
 134    --  Set to True if the binder needs to generate a file designed for
 135    --  building a library. May be set to True by Gnatbind.Scan_Bind_Arg.
 136
 137    Bind_Only : Boolean := False;
 138    --  GNATMAKE
 139    --  Set to True to skip compile and link steps
 140    --  (except when Compile_Only and/or Link_Only are True).
 141
 142    Brief_Output : Boolean := False;
 143    --  GNAT, GNATBIND
 144    --  Force brief error messages to standard error, even if verbose mode is
 145    --  set (so that main error messages go to standard output).
 146
 147    Check_Object_Consistency : Boolean := False;
 148    --  GNATBIND, GNATMAKE
 149    --  Set to True to check whether every object file is consistent with
 150    --  its corresponding ada library information (ALI) file. An object
 151    --  file is inconsistent with the corresponding ALI file if the object
 152    --  file does not exist or if it has an older time stamp than the ALI file.
 153    --  Default above is for GNATBIND. GNATMAKE overrides this default to
 154    --  True (see Make.Initialize) since we normally do need to check source
 155    --  consistencies in gnatmake.
 156
 157    Check_Only : Boolean := False;
 158    --  GNATBIND
 159    --  Set to True to do checks only, no output of binder file.
 160
 161    Check_Readonly_Files : Boolean := False;
 162    --  GNATMAKE
 163    --  Set to True to check readonly files during the make process.
 164
 165    Check_Source_Files : Boolean := True;
 166    --  GNATBIND, GNATMAKE
 167    --  Set to True to enable consistency checking for any source files that
 168    --  are present (i.e. date must match the date in the library info file).
 169    --  Set to False for object file consistency check only. This flag is
 170    --  directly modified by gnatmake, to affect the shared binder routines.
 171
 172    Check_Switches : Boolean := False;
 173    --  GNATMAKE
 174    --  Set to True to check compiler options during the make process.
 175
 176    Check_Unreferenced : Boolean := False;
 177    --  GNAT
 178    --  Set to True to enable checking for unreferenced entities other
 179    --  than formal parameters (for which see Check_Unreferenced_Formals)
 180
 181    Check_Unreferenced_Formals : Boolean := False;
 182    --  GNAT
 183    --  Set True to check for unreferenced formals. This is turned
 184    --  on by -gnatwa/wf/wu and turned off by -gnatwA/wF/wU.
 185
 186    Check_Withs : Boolean := False;
 187    --  GNAT
 188    --  Set to True to enable checking for unused withs, and also the case
 189    --  of withing a package and using none of the entities in the package.
 190
 191    Compile_Only : Boolean := False;
 192    --  GNATMAKE
 193    --  Set to True to skip bind and link steps (except when Bind_Only is True)
 194
 195    Compress_Debug_Names : Boolean := False;
 196    --  GNAT
 197    --  Set to True if the option to compress debug information is set (-gnatC)
 198
 199    Config_File : Boolean := True;
 200    --  GNAT
 201    --  Set to False to inhibit reading and processing of gnat.adc file
 202
 203    Config_File_Name : String_Ptr := null;
 204    --  GNAT
 205    --  File name of configuration pragmas file (given by switch -gnatec)
 206
 207    Constant_Condition_Warnings : Boolean := False;
 208    --  GNAT
 209    --  Set to True to activate warnings on constant conditions
 210
 211    Create_Mapping_File : Boolean := False;
 212    --  GNATMAKE
 213    --  Set to True (-C switch) to indicate that gnatmake
 214    --  invokes the compiler with a mapping file (-gnatem compiler switch).
 215
 216    subtype Debug_Level_Value is Nat range 0 .. 3;
 217    Debugger_Level : Debug_Level_Value := 0;
 218    --  GNATBIND
 219    --  The value given to the -g parameter.
 220    --  The default value for -g with no value is 2
 221    --  This is usually ignored by GNATBIND, except in the VMS version
 222    --  where it is passed as an argument to __gnat_initialize to trigger
 223    --  the activation of the remote debugging interface (is this true???).
 224
 225    Debug_Generated_Code : Boolean := False;
 226    --  GNAT
 227    --  Set True (-gnatD switch) to debug generated expanded code instead
 228    --  of the original source code. Causes debugging information to be
 229    --  written with respect to the generated code file that is written.
 230
 231    Display_Compilation_Progress : Boolean := False;
 232    --  GNATMAKE
 233    --  Set True (-d switch) to display information on progress while compiling
 234    --  files. Internal flag to be used in conjunction with an IDE such as
 235    --  Glide.
 236
 237    type Distribution_Stub_Mode_Type is
 238    --  GNAT
 239      (No_Stubs,
 240       --  Normal mode, no generation/compilation of distribution stubs
 241
 242       Generate_Receiver_Stub_Body,
 243       --  The unit being compiled is the RCI body, and the compiler will
 244       --  generate the body for the receiver stubs and compile it.
 245
 246       Generate_Caller_Stub_Body);
 247       --  The unit being compiled is the RCI spec, and the compiler will
 248       --  generate the body for the caller stubs and compile it.
 249
 250    Distribution_Stub_Mode : Distribution_Stub_Mode_Type := No_Stubs;
 251    --  GNAT
 252    --  This enumeration variable indicates the five states of distribution
 253    --  annex stub generation/compilation.
 254
 255    Do_Not_Execute : Boolean := False;
 256    --  GNATMAKE
 257    --  Set to True if no actual compilations should be undertaken.
 258
 259    Dynamic_Elaboration_Checks : Boolean := False;
 260    --  GNAT
 261    --  Set True for dynamic elaboration checking mode, as set by the -gnatE
 262    --  switch or by the use of pragma Elaboration_Checks (Dynamic).
 263
 264    Elab_Dependency_Output : Boolean := False;
 265    --  GNATBIND
 266    --  Set to True to output complete list of elaboration constraints
 267
 268    Elab_Order_Output : Boolean := False;
 269    --  GNATBIND
 270    --  Set to True to output chosen elaboration order
 271
 272    Elab_Warnings : Boolean := False;
 273    --  GNAT
 274    --  Set to True to generate full elaboration warnings (-gnatwl)
 275
 276    Enable_Overflow_Checks : Boolean := False;
 277    --  GNAT
 278    --  Set to True if -gnato (enable overflow checks) switch is set,
 279    --  but not -gnatp.
 280
 281    type Exception_Mechanism_Type is (Setjmp_Longjmp, Front_End_ZCX, GCC_ZCX);
 282    pragma Convention (C, Exception_Mechanism_Type);
 283
 284    Exception_Mechanism : Exception_Mechanism_Type := Setjmp_Longjmp;
 285    --  GNAT
 286    --  Set to the appropriate value depending on the default as given in
 287    --  system.ads (ZCX_By_Default, GCC_ZCX_Support, Front_End_ZCX_Support)
 288    --  and the use of -gnatL -gnatZ (and -gnatdX). The C convention is
 289    --  there to make this variable accessible to gigi.
 290
 291    Exception_Tracebacks : Boolean := False;
 292    --  GNATBIND
 293    --  Set to True to store tracebacks in exception occurrences (-E)
 294
 295    Extensions_Allowed : Boolean := False;
 296    --  GNAT
 297    --  Set to True by switch -gnatX if GNAT specific language extensions
 298    --  are allowed. For example, "with type" is a GNAT extension.
 299
 300    type External_Casing_Type is (
 301      As_Is,       -- External names cased as they appear in the Ada source
 302      Uppercase,   -- External names forced to all uppercase letters
 303      Lowercase);  -- External names forced to all lowercase letters
 304
 305    External_Name_Imp_Casing : External_Casing_Type := Lowercase;
 306    --  GNAT
 307    --  The setting of this flag determines the casing of external names
 308    --  when the name is implicitly derived from an entity name (i.e. either
 309    --  no explicit External_Name or Link_Name argument is used, or, in the
 310    --  case of extended DEC pragmas, the external name is given using an
 311    --  identifier. The As_Is setting is not permitted here (since this would
 312    --  create Ada source programs that were case sensitive).
 313
 314    External_Name_Exp_Casing : External_Casing_Type := As_Is;
 315    --  GNAT
 316    --  The setting of this flag determines the casing of an external name
 317    --  specified explicitly with a string literal. As_Is means the string
 318    --  literal is used as given with no modification to the casing. If
 319    --  Lowercase or Uppercase is set, then the string is forced to all
 320    --  lowercase or all uppercase letters as appropriate. Note that this
 321    --  setting has no effect if the external name is given using an identifier
 322    --  in the case of extended DEC import/export pragmas (in this case the
 323    --  casing is controlled by External_Name_Imp_Casing), and also has no
 324    --  effect if an explicit Link_Name is supplied (a link name is always
 325    --  used exactly as given).
 326
 327    Float_Format : Character := ' ';
 328    --  GNAT
 329    --  A non-blank value indicates that a Float_Format pragma has been
 330    --  processed, in which case this variable is set to 'I' for IEEE or
 331    --  to 'V' for VAX. The setting of 'V' is only possible on OpenVMS
 332    --  versions of GNAT.
 333
 334    Float_Format_Long : Character := ' ';
 335    --  GNAT
 336    --  A non-blank value indicates that a Long_Float pragma has been
 337    --  processed (this pragma is recognized only in OpenVMS versions
 338    --  of GNAT), in which case this variable is set to D or G for
 339    --  D_Float or G_Float.
 340
 341    Force_ALI_Tree_File : Boolean := False;
 342    --  GNAT
 343    --  Force generation of ALI file even if errors are encountered.
 344    --  Also forces generation of tree file if -gnatt is also set.
 345
 346    Force_Compilations : Boolean := False;
 347    --  GNATMAKE
 348    --  Set to force recompilations even when the objects are up-to-date.
 349
 350    Force_RM_Elaboration_Order : Boolean := False;
 351    --  GNATBIND
 352    --  True if binding with forced RM elaboration order (-f switch set)
 353    --  Note: this is considered an obsolescent option, to be removed in
 354    --  some future release. It is no longer documented. The proper way
 355    --  to get this effect is to use -gnatE and suppress elab checks.
 356
 357    Full_List : Boolean := False;
 358    --  GNAT
 359    --  Set True to generate full source listing with embedded errors
 360
 361    Global_Discard_Names : Boolean := False;
 362    --  GNAT
 363    --  Set true if a pragma Discard_Names applies to the current unit
 364
 365    GNAT_Mode : Boolean := False;
 366    --  GNAT
 367    --  True if compiling in GNAT system mode (-gnatg switch)
 368
 369    HLO_Active : Boolean := False;
 370    --  GNAT
 371    --  True if High Level Optimizer is activated (-gnatH switch)
 372
 373    Implementation_Unit_Warnings : Boolean := True;
 374    --  GNAT
 375    --  Set True to active warnings for use of implementation internal units.
 376    --  Can be controlled by use of -gnatwi/-gnatwI.
 377
 378    Identifier_Character_Set : Character;
 379    --  GNAT
 380    --  This variable indicates the character set to be used for identifiers.
 381    --  The possible settings are:
 382    --    '1'  Latin-5 (ISO-8859-1)
 383    --    '2'  Latin-5 (ISO-8859-2)
 384    --    '3'  Latin-5 (ISO-8859-3)
 385    --    '4'  Latin-5 (ISO-8859-4)
 386    --    '5'  Latin-5 (ISO-8859-5, Cyrillic)
 387    --    '9'  Latin-5 (ISO-8859-9)
 388    --    'p'  PC (US, IBM page 437)
 389    --    '8'  PC (European, IBM page 850)
 390    --    'f'  Full upper set (all distinct)
 391    --    'n'  No upper characters (Ada/83 rules)
 392    --    'w'  Latin-1 plus wide characters allowed in identifiers
 393    --
 394    --  The setting affects the set of letters allowed in identifiers and the
 395    --  upper/lower case equivalences. It does not affect the interpretation of
 396    --  character and string literals, which are always stored using the actual
 397    --  coding in the source program. This variable is initialized to the
 398    --  default value appropriate to the system (in Osint.Initialize), and then
 399    --  reset if a command line switch is used to change the setting.
 400
 401    Ineffective_Inline_Warnings : Boolean := False;
 402    --  GNAT
 403    --  Set True to activate warnings if front-end inlining (-gnatN) is not
 404    --  able to actually inline a particular call (or all calls). Can be
 405    --  controlled by use of -gnatwp/-gnatwP.
 406
 407    Init_Or_Norm_Scalars : Boolean := False;
 408    --  GNAT
 409    --  Set True if a pragma Initialize_Scalars applies to the current unit.
 410    --  Also set True if a pragma Normalize_Scalars applies.
 411
 412    Initialize_Scalars : Boolean := False;
 413    --  GNAT
 414    --  Set True if a pragma Initialize_Scalars applies to the current unit.
 415    --  Note that Init_Or_Norm_Scalars is also set to True if this is True.
 416
 417    Initialize_Scalars_Mode : Character := 'I';
 418    --  GNATBIND
 419    --  Set to 'I' for -Sin (default), 'L' for -Slo, 'H' for -Shi, 'X' for -Sxx
 420
 421    Initialize_Scalars_Val : String (1 .. 2);
 422    --  GNATBIND
 423    --  Valid only if Initialize_Scalars_Mode is set to 'X' (-Shh). Contains
 424    --  the two hex bytes from the -Shh switch.
 425
 426    Inline_Active : Boolean := False;
 427    --  GNAT
 428    --  Set True to activate pragma Inline processing across modules. Default
 429    --  for now is not to inline across module boundaries.
 430
 431    Front_End_Inlining : Boolean := False;
 432    --  GNAT
 433    --  Set True to activate inlining by front-end expansion.
 434
 435    Inline_Processing_Required : Boolean := False;
 436    --  GNAT
 437    --  Set True if inline processing is required. Inline processing is
 438    --  required if an active Inline pragma is processed. The flag is set
 439    --  for a pragma Inline or Inline_Always that is actually active.
 440
 441    In_Place_Mode : Boolean := False;
 442    --  GNATMAKE
 443    --  Set True to store ALI and object files in place ie in the object
 444    --  directory if these files already exist or in the source directory
 445    --  if not.
 446
 447    Keep_Going : Boolean := False;
 448    --  GNATMAKE
 449    --  When True signals gnatmake to ignore compilation errors and keep
 450    --  processing sources until there is no more work.
 451
 452    Link_Only : Boolean := False;
 453    --  GNATMAKE
 454    --  Set to True to skip compile and bind steps
 455    --  (except when Bind_Only is set to True).
 456
 457    List_Restrictions : Boolean := False;
 458    --  GNATBIND
 459    --  Set to True to list restrictions pragmas that could apply to partition
 460
 461    List_Units : Boolean := False;
 462    --  GNAT
 463    --  List units in the active library for a compilation (-gnatu switch)
 464
 465    List_Dependencies : Boolean := False;
 466    --  GNATMAKE
 467    --  When True gnatmake verifies that the objects are up to date and
 468    --  outputs the list of object dependencies (-M switch).
 469    --  Output depends if -a switch is used or not.
 470    --  This list can be used directly in a Makefile.
 471
 472    List_Representation_Info : Int range 0 .. 3 := 0;
 473    --  GNAT
 474    --  Set non-zero by -gnatR switch to list representation information.
 475    --  The settings are as follows:
 476    --
 477    --    0 = no listing of representation information (default as above)
 478    --    1 = list rep info for user defined record and array types
 479    --    2 = list rep info for all user defined types and objects
 480    --    3 = like 2, but variable fields are decoded symbolically
 481
 482    List_Representation_Info_To_File : Boolean := False;
 483    --  GNAT
 484    --  Set true by -gnatRs switch. Causes information from -gnatR/1/2/3
 485    --  to be written to file.rep (where file is the name of the source
 486    --  file) instead of stdout. For example, if file x.adb is compiled
 487    --  using -gnatR2s then representation info is written to x.adb.ref.
 488
 489    type Creat_Repinfo_File_Proc is access procedure (Src : File_Name_Type);
 490    type Write_Repinfo_Line_Proc is access procedure (Info : String);
 491    type Close_Repinfo_File_Proc is access procedure;
 492    --  Types used for procedure addresses below
 493
 494    Creat_Repinfo_File_Access : Creat_Repinfo_File_Proc := null;
 495    Write_Repinfo_Line_Access : Write_Repinfo_Line_Proc := null;
 496    Close_Repinfo_File_Access : Close_Repinfo_File_Proc := null;
 497    --  GNAT
 498    --  These three locations are left null when operating in non-compiler
 499    --  (e.g. ASIS mode), but when operating in compiler mode, they are
 500    --  set to point to the three corresponding procedures in Osint. The
 501    --  reason for this slightly strange interface is to prevent Repinfo
 502    --  from dragging in Osint in ASIS mode, which would include a lot of
 503    --  unwanted units in the ASIS build.
 504
 505    Locking_Policy : Character := ' ';
 506    --  GNAT
 507    --  Set to ' ' for the default case (no locking policy specified).
 508    --  Reset to first character (uppercase) of locking policy name if a
 509    --  valid pragma Locking_Policy is encountered.
 510
 511    Look_In_Primary_Dir : Boolean := True;
 512    --  GNAT, GNATBIND, GNATMAKE
 513    --  Set to False if a -I- was present on the command line.
 514    --  When True we are allowed to look in the primary directory to locate
 515    --  other source or library files.
 516
 517    Mapping_File_Name : String_Ptr := null;
 518    --  GNAT
 519    --  File name of mapping between unit names, file names and path names.
 520    --  (given by switch -gnatem)
 521
 522    Maximum_Errors : Int := 9999;
 523    --  GNAT, GNATBIND
 524    --  Maximum number of errors before compilation is terminated
 525
 526    Maximum_File_Name_Length : Int;
 527    --  GNAT, GNATBIND
 528    --  Maximum number of characters allowed in a file name, not counting the
 529    --  extension, as set by the appropriate switch. If no switch is given,
 530    --  then this value is initialized by Osint to the appropriate value.
 531
 532    Maximum_Processes : Positive := 1;
 533    --  GNATMAKE
 534    --  Maximum number of processes that should be spawned to carry out
 535    --  compilations.
 536
 537    Minimal_Recompilation : Boolean := False;
 538    --  GNATMAKE
 539    --  Set to True if minimal recompilation mode requested.
 540
 541    No_Stdlib : Boolean := False;
 542    --  GNATMAKE, GNATBIND, GNATFIND, GNATXREF
 543    --  Set to True if no default library search dirs added to search list.
 544
 545    No_Stdinc : Boolean := False;
 546    --  GNAT, GNATBIND, GNATMAKE, GNATFIND, GNATXREF
 547    --  Set to True if no default source search dirs added to search list.
 548
 549    No_Main_Subprogram : Boolean := False;
 550    --  GNATMAKE, GNATBIND
 551    --  Set to True if compilation/binding of a program without main
 552    --  subprogram requested.
 553
 554    Normalize_Scalars : Boolean := False;
 555    --  GNAT
 556    --  Set True if a pragma Normalize_Scalars applies to the current unit.
 557    --  Note that Init_Or_Norm_Scalars is also set to True if this is True.
 558
 559    No_Run_Time : Boolean := False;
 560    --  GNAT
 561    --  Set True if a valid pragma No_Run_Time is processed or if the
 562    --  flag Targparm.High_Integrity_Mode_On_Target is set True.
 563
 564    type Operating_Mode_Type is (Check_Syntax, Check_Semantics, Generate_Code);
 565    Operating_Mode : Operating_Mode_Type := Generate_Code;
 566    --  GNAT
 567    --  Indicates the operating mode of the compiler. The default is generate
 568    --  code, which runs the parser, semantics and backend. Switches can be
 569    --  used to set syntax checking only mode, or syntax and semantics checking
 570    --  only mode. Operating_Mode can also be modified as a result of detecting
 571    --  errors during the compilation process. In particular if any error is
 572    --  detected then this flag is reset from Generate_Code to Check_Semantics
 573    --  after generating an error message.
 574
 575    Output_File_Name_Present : Boolean := False;
 576    --  GNATBIND, GNAT, GNATMAKE
 577    --  Set to True when the output C file name is given with option -o
 578    --  for GNATBIND, when the object file name is given with option
 579    --  -gnatO for GNAT or when the executable is given with option -o
 580    --  for GNATMAKE.
 581
 582    Output_Linker_Option_List : Boolean := False;
 583    --  GNATBIND
 584    --  True if output of list of linker options is requested (-K switch set)
 585
 586    Output_Object_List : Boolean := False;
 587    --  GNATBIND
 588    --  True if output of list of objects is requested (-O switch set)
 589
 590    Pessimistic_Elab_Order : Boolean := False;
 591    --  GNATBIND
 592    --  True if pessimistic elaboration order is to be chosen (-p switch set)
 593
 594    Polling_Required : Boolean := False;
 595    --  GNAT
 596    --  Set to True if polling for asynchronous abort is enabled by using
 597    --  the -gnatP option for GNAT.
 598
 599    Print_Generated_Code : Boolean := False;
 600    --  GNAT
 601    --  Set to True to enable output of generated code in source form. This
 602    --  flag is set by the -gnatG switch.
 603
 604    Propagate_Exceptions : Boolean := False;
 605    --  GNAT
 606    --  Indicates if subprogram descriptor exception tables should be
 607    --  built for imported subprograms. Set True if a Propagate_Exceptions
 608    --  pragma applies to the extended main unit.
 609
 610    Queuing_Policy : Character := ' ';
 611    --  GNAT
 612    --  Set to ' ' for the default case (no queuing policy specified).
 613    --  Reset to first character (uppercase) of locking policy name if a valid
 614    --  Queuing_Policy pragma is encountered.
 615
 616    Quiet_Output : Boolean := False;
 617    --  GNATMAKE
 618    --  Set to True if the list of compilation commands should not be output.
 619
 620    RTS_Switch : Boolean := False;
 621    --  GNAT, GNATMAKE, GNATBIND, GNATLS, GNATFIND, GNATXREF
 622    --  Set to True when the --RTS switch is set
 623
 624    Shared_Libgnat : Boolean;
 625    --  GNATBIND
 626    --  Set to True if a shared libgnat is requested by using the -shared
 627    --  option for GNATBIND and to False when using the -static option. The
 628    --  value of this flag is set by Gnatbind.Scan_Bind_Arg.
 629
 630    Stack_Checking_Enabled : Boolean;
 631    --  GNAT
 632    --  Set to indicate if -fstack-check switch is set for the compilation.
 633    --  True means that the switch is set, so that stack checking is enabled.
 634    --  False means that the switch is not set (no stack checking). This
 635    --  value is obtained from the external imported value flag_stack_check
 636    --  in the gcc backend (see Frontend) and may be referenced throughout
 637    --  the compilation phases.
 638
 639    Style_Check : Boolean := False;
 640    --  GNAT
 641    --  Set True to perform style checks. Activates checks carried out
 642    --  in package Style (see body of this package for details of checks)
 643    --  This flag is set True by either the -gnatg or -gnaty switches.
 644
 645    System_Extend_Pragma_Arg : Node_Id := Empty;
 646    --  GNAT
 647    --  Set non-empty if and only if a correct Extend_System pragma was present
 648    --  in which case it points to the argument of the pragma, and the name can
 649    --  be located as Chars (Expression (System_Extend_Pragma_Arg)).
 650
 651    Subunits_Missing : Boolean := False;
 652    --  GNAT
 653    --  This flag is set true if missing subunits are detected with code
 654    --  generation active. This causes code generation to be skipped.
 655
 656    Suppress_Checks : Boolean := False;
 657    --  GNAT
 658    --  Set to True if -gnatp (suppress all checks) switch present.
 659
 660    Suppress_Options : Suppress_Record;
 661    --  GNAT
 662    --  Flags set True to suppress corresponding check, i.e. add an implicit
 663    --  pragma Suppress at the outer level of each unit compiled. Note that
 664    --  these suppress actions can be overridden by the use of the Unsuppress
 665    --  pragma. This variable is initialized by Osint.Initialize.
 666
 667    Table_Factor : Int := 1;
 668    --  GNAT
 669    --  Factor by which all initial table sizes set in Alloc are multiplied.
 670    --  Used in Table to calculate initial table sizes (the initial table
 671    --  size is the value in Alloc, used as the Table_Initial parameter
 672    --  value, multiplied by the factor given here. The default value is
 673    --  used if no -gnatT switch appears.
 674
 675    Task_Dispatching_Policy : Character := ' ';
 676    --  GNAT
 677    --  Set to ' ' for the default case (no task dispatching policy specified).
 678    --  Reset to first character (uppercase) of task dispatching policy name
 679    --  if a valid Task_Dispatching_Policy pragma is encountered.
 680
 681    Tasking_Used : Boolean := False;
 682    --  Set True if any tasking construct is encountered. Used to activate the
 683    --  output of the Q, L and T lines in ALI files.
 684
 685    Time_Slice_Set : Boolean := False;
 686    --  GNATBIND
 687    --  Set True if a pragma Time_Slice is processed in the main unit, or
 688    --  if the -gnatTnn switch is present to set a time slice value.
 689
 690    Time_Slice_Value : Nat;
 691    --  GNATBIND
 692    --  Time slice value. Valid only if Time_Slice_Set is True, i.e. if a
 693    --  Time_Slice pragma has been processed. Set to the time slice value
 694    --  in microseconds. Negative values are stored as zero, and the value
 695    --  is not larger than 1_000_000_000 (1000 seconds). Values larger than
 696    --  this are reset to this maximum. This can also be set with the -gnatTnn
 697    --  switch.
 698
 699    Tolerate_Consistency_Errors : Boolean := False;
 700    --  GNATBIND
 701    --  Tolerate time stamp and other consistency errors. If this flag is
 702    --  set to True (-t), then inconsistencies result in warnings rather than
 703    --  errors.
 704
 705    Tree_Output : Boolean := False;
 706    --  GNAT
 707    --  Set to True (-gnatt) to generate output tree file
 708
 709    Try_Semantics : Boolean := False;
 710    --  GNAT
 711    --  Flag set to force attempt at semantic analysis, even if parser errors
 712    --  occur. This will probably cause blowups at this stage in the game. On
 713    --  the other hand, most such blowups will be caught cleanly and simply
 714    --  say compilation abandoned. This flag is set to True by -gnatq or -gnatQ.
 715
 716    Unique_Error_Tag : Boolean := Tag_Errors;
 717    --  GNAT
 718    --  Indicates if error messages are to be prefixed by the string error:
 719    --  Initialized from Tag_Errors, can be forced on with the -gnatU switch.
 720
 721    Unreserve_All_Interrupts : Boolean := False;
 722    --  GNAT, GNATBIND
 723    --  Normally set False, set True if a valid Unreserve_All_Interrupts
 724    --  pragma appears anywhere in the main unit for GNAT, or if any ALI
 725    --  file has the corresponding attribute set in GNATBIND.
 726
 727    Upper_Half_Encoding : Boolean := False;
 728    --  GNAT
 729    --  Normally set False, indicating that upper half ASCII characters are
 730    --  used in the normal way to represent themselves. If the wide character
 731    --  encoding method uses the upper bit for this encoding, then this flag
 732    --  is set True, and upper half characters in the source indicate the
 733    --  start of a wide character sequence.
 734
 735    Usage_Requested : Boolean := False;
 736    --  GNAT, GNATBIND, GNATMAKE
 737    --  Set to True if -h (-gnath for the compiler) switch encountered
 738    --  requesting usage information
 739
 740    Use_VADS_Size : Boolean := False;
 741    --  GNAT
 742    --  Set to True if a valid pragma Use_VADS_Size is processed
 743
 744    Validity_Checks_On  : Boolean := True;
 745    --  GNAT
 746    --  This flag determines if validity checking is on or off. The initial
 747    --  state is on, and the required default validity checks are active. The
 748    --  actual set of checks that is performed if Validity_Checks_On is set
 749    --  is defined by the switches in package Sem_Val. The Validity_Checks_On
 750    --  flag is controlled by pragma Validity_Checks (On | Off), and also
 751    --  some generated compiler code (typically code that has to do with
 752    --  validity check generation) is compiled with this flag set to False.
 753    --  This flag is set to False by the -gnatp switch.
 754
 755    Verbose_Mode : Boolean := False;
 756    --  GNAT, GNATBIND, GNATMAKE, GNATLINK, GNATLS, GNATCHOP, GNATNAME
 757    --  Set to True to get verbose mode (full error message text and location
 758    --  information sent to standard output, also header, copyright and summary)
 759
 760    Warn_On_Biased_Rounding : Boolean := False;
 761    --  GNAT
 762    --  Set to True to generate warnings for static constants that are rounded
 763    --  in a manner inconsistent with unbiased rounding (round to even). Can
 764    --  be modified by use of -gnatwb/B.
 765
 766    Warn_On_Dereference : Boolean := False;
 767    --  GNAT
 768    --  Set to True to generate warnings for implicit dereferences for array
 769    --  indexing and record component access. Modified by use of -gnatwd/D.
 770
 771    Warn_On_Hiding : Boolean := False;
 772    --  GNAT
 773    --  Set to True to generate warnings if a declared entity hides another
 774    --  entity. The default is that this warning is suppressed.
 775
 776    Warn_On_Redundant_Constructs : Boolean := False;
 777    --  GNAT
 778    --  Set to True to generate warnings for redundant constructs (e.g. useless
 779    --  assignments/conversions). The default is that this warning is disabled.
 780
 781    type Warning_Mode_Type is (Suppress, Normal, Treat_As_Error);
 782    Warning_Mode : Warning_Mode_Type := Normal;
 783    --  GNAT, GNATBIND
 784    --  Controls treatment of warning messages. If set to Suppress, warning
 785    --  messages are not generated at all. In Normal mode, they are generated
 786    --  but do not count as errors. In Treat_As_Error mode, warning messages
 787    --  are generated and are treated as errors.
 788
 789    Wide_Character_Encoding_Method : WC_Encoding_Method := WCEM_Brackets;
 790    --  GNAT
 791    --  Method used for encoding wide characters in the source program. See
 792    --  description of type in unit System.WCh_Con for a list of the methods
 793    --  that are currently supported. Note that brackets notation is always
 794    --  recognized in source programs regardless of the setting of this
 795    --  variable. The default setting causes only the brackets notation
 796    --  to be recognized. If this is the main unit, this setting also
 797    --  controls the output of the W=? parameter in the ALI file, which
 798    --  is used to provide the default for Wide_Text_IO files.
 799
 800    Xref_Active : Boolean := True;
 801    --  GNAT
 802    --  Set if cross-referencing is enabled (i.e. xref info in ALI files)
 803
 804    Zero_Cost_Exceptions_Val : Boolean;
 805    Zero_Cost_Exceptions_Set : Boolean := False;
 806    --  GNAT
 807    --  These values are to record the setting of the zero cost exception
 808    --  handling mode set by argument switches (-gnatZ/-gnatL). If the
 809    --  value is set by one of these switches, then Zero_Cost_Exceptions_Set
 810    --  is set to True, and Zero_Cost_Exceptions_Val indicates the setting.
 811
 812    ----------------------------
 813    -- Configuration Settings --
 814    ----------------------------
 815
 816    --  These are settings that are used to establish the mode at the start
 817    --  of each unit. The values defined below can be affected either by
 818    --  command line switches, or by the use of appropriate configuration
 819    --  pragmas in the gnat.adc file.
 820
 821    Ada_83_Config : Boolean;
 822    --  GNAT
 823    --  This is the value of the configuration switch for Ada 83 mode, as set
 824    --  by the command line switch -gnat83, and possibly modified by the use
 825    --  of configuration pragmas Ada_95 and Ada_83 in the gnat.adc file. This
 826    --  switch is used to set the initial value for Ada_83 mode at the start
 827    --  of analysis of a unit. Note however, that the setting of this flag
 828    --  is ignored for internal and predefined units (which are always compiled
 829    --  in Ada 95 mode).
 830
 831    Dynamic_Elaboration_Checks_Config : Boolean := False;
 832    --  GNAT
 833    --  Set True for dynamic elaboration checking mode, as set by the -gnatE
 834    --  switch or by the use of pragma Elaboration_Checking (Dynamic).
 835
 836    Extensions_Allowed_Config : Boolean;
 837    --  GNAT
 838    --  This is the flag that indicates whether extensions are allowed.
 839    --  It can be set True either by use of the -gnatX switch, or by use
 840    --  of the configuration pragma Extensions_Allowed (On). It is always
 841    --  set to True for internal GNAT units, since extensions are always
 842    --  permitted in such units.
 843
 844    External_Name_Exp_Casing_Config : External_Casing_Type;
 845    --  GNAT
 846    --  This is the value of the configuration switch that controls casing
 847    --  of external symbols for which an explicit external name is given. It
 848    --  can be set to Uppercase by the command line switch -gnatF, and further
 849    --  modified by the use of the configuration pragma External_Name_Casing
 850    --  in the gnat.adc file. This flag is used to set the initial value
 851    --  for External_Name_Exp_Casing at the start of analyzing each unit.
 852    --  Note however that the setting of this flag is ignored for internal
 853    --  and predefined units (which are always compiled with As_Is mode).
 854
 855    External_Name_Imp_Casing_Config : External_Casing_Type;
 856    --  GNAT
 857    --  This is the value of the configuration switch that controls casing
 858    --  of external symbols where the external name is implicitly given. It
 859    --  can be set to Uppercase by the command line switch -gnatF, and further
 860    --  modified by the use of the configuration pragma External_Name_Casing
 861    --  in the gnat.adc file. This flag is used to set the initial value
 862    --  for External_Name_Imp_Casing at the start of analyzing each unit.
 863    --  Note however that the setting of this flag is ignored for internal
 864    --  and predefined units (which are always compiled with Lowercase mode).
 865
 866    Polling_Required_Config : Boolean;
 867    --  GNAT
 868    --  This is the value of the configuration switch that controls polling
 869    --  mode. It can be set True by the command line switch -gnatP, and then
 870    --  further modified by the use of pragma Polling in the gnat.adc file.
 871    --  This flag is used to set the initial value for Polling_Required
 872    --  at the start of analyzing each unit.
 873
 874    Use_VADS_Size_Config : Boolean;
 875    --  GNAT
 876    --  This is the value of the configuration switch that controls the use
 877    --  of VADS_Size instead of Size whereever the attribute Size is used.
 878    --  It can be set True by the use of the pragma Use_VADS_Size in the
 879    --  gnat.adc file. This flag is used to set the initial value for
 880    --  Use_VADS_Size at the start of analyzing each unit. Note however that
 881    --  the setting of this flag is ignored for internal and predefined
 882    --  units (which are always compiled with the standard Size semantics).
 883
 884    type Config_Switches_Type is private;
 885    --  Type used to save values of the switches set from Config values
 886
 887    procedure Save_Opt_Config_Switches (Save : out Config_Switches_Type);
 888    --  This procedure saves the current values of the switches which are
 889    --  initialized from the above Config values, and then resets these
 890    --  switches according to the Config value settings.
 891
 892    procedure Set_Opt_Config_Switches (Internal_Unit : Boolean);
 893    --  This procedure sets the switches to the appropriate initial values.
 894    --  The parameter Internal_Unit is True for an internal or predefined
 895    --  unit, and affects the way the switches are set (see above).
 896
 897    procedure Restore_Opt_Config_Switches (Save : Config_Switches_Type);
 898    --  This procedure restores a set of switch values previously saved
 899    --  by a call to Save_Opt_Switches.
 900
 901    procedure Register_Opt_Config_Switches;
 902    --  This procedure is called after processing the gnat.adc file to record
 903    --  the values of the Config switches, as possibly modified by the use
 904    --  of command line switches and configuration pragmas.
 905
 906    ------------------------
 907    -- Other Global Flags --
 908    ------------------------
 909
 910    Expander_Active : Boolean := False;
 911    --  A flag that indicates if expansion is active (True) or deactivated
 912    --  (False). When expansion is deactivated all calls to expander routines
 913    --  have no effect. Note that the initial setting of False is merely to
 914    --  prevent saving of an undefined value for an initial call to the
 915    --  Expander_Mode_Save_And_Set procedure. For more information on the
 916    --  use of this flag, see package Expander. Indeed this flag might more
 917    --  logically be in the spec of Expander, but it is referenced by Errout,
 918    --  and it really seems wrong for Errout to depend on Expander.
 919
 920    -----------------------
 921    -- Tree I/O Routines --
 922    -----------------------
 923
 924    procedure Tree_Read;
 925    --  Reads switch settings from current tree file using Tree_Read
 926
 927    procedure Tree_Write;
 928    --  Writes out switch settings to current tree file using Tree_Write
 929
 930 private
 931
 932    type Config_Switches_Type is record
 933       Ada_83                     : Boolean;
 934       Dynamic_Elaboration_Checks : Boolean;
 935       Extensions_Allowed         : Boolean;
 936       External_Name_Exp_Casing   : External_Casing_Type;
 937       External_Name_Imp_Casing   : External_Casing_Type;
 938       Polling_Required           : Boolean;
 939       Use_VADS_Size              : Boolean;
 940    end record;
 941
 942 end Opt;