gcc/ada/switch-c.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                             S W I T C H - C                              --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2001-2007, 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 3,  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 COPYING3.  If not, go to --
  19 -- http://www.gnu.org/licenses for a complete copy of the license.          --
  20 --                                                                          --
  21 -- GNAT was originally developed  by the GNAT team at  New York University. --
  22 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  23 --                                                                          --
  24 ------------------------------------------------------------------------------
  25
  26 with Debug;    use Debug;
  27 with Lib;      use Lib;
  28 with Osint;    use Osint;
  29 with Opt;      use Opt;
  30 with Prepcomp; use Prepcomp;
  31 with Validsw;  use Validsw;
  32 with Sem_Warn; use Sem_Warn;
  33 with Stylesw;  use Stylesw;
  34
  35 with System.OS_Lib; use System.OS_Lib;
  36
  37 with System.WCh_Con; use System.WCh_Con;
  38
  39 package body Switch.C is
  40
  41    RTS_Specified : String_Access := null;
  42    --  Used to detect multiple use of --RTS= flag
  43
  44    -----------------------------
  45    -- Scan_Front_End_Switches --
  46    -----------------------------
  47
  48    procedure Scan_Front_End_Switches (Switch_Chars : String) is
  49       First_Switch : Boolean := True;
  50       --  False for all but first switch
  51
  52       Max : constant Natural := Switch_Chars'Last;
  53       Ptr : Natural;
  54       C   : Character := ' ';
  55       Dot : Boolean;
  56
  57       Store_Switch : Boolean;
  58       --  For -gnatxx switches, the normal processing, signalled by this flag
  59       --  being set to True, is to store the switch on exit from the case
  60       --  statement, the switch stored is -gnat followed by the characters
  61       --  from First_Char to Ptr-1. For cases like -gnaty, where the switch
  62       --  is stored in separate pieces, this flag is set to False, and the
  63       --  appropriate calls to Store_Compilation_Switch are made from within
  64       --  the case branch.
  65
  66       First_Char : Positive;
  67       --  Marks start of switch to be stored
  68
  69    begin
  70       Ptr := Switch_Chars'First;
  71
  72       --  Skip past the initial character (must be the switch character)
  73
  74       if Ptr = Max then
  75          Bad_Switch (C);
  76       else
  77          Ptr := Ptr + 1;
  78       end if;
  79
  80       --  Handle switches that do not start with -gnat
  81
  82       if Ptr + 3 > Max
  83         or else Switch_Chars (Ptr .. Ptr + 3) /= "gnat"
  84       then
  85          --  There are two front-end switches that do not start with -gnat:
  86          --  -I, --RTS
  87
  88          if Switch_Chars (Ptr) = 'I' then
  89
  90             --  Set flag Search_Directory_Present if switch is "-I" only:
  91             --  the directory will be the next argument.
  92
  93             if Ptr = Max then
  94                Search_Directory_Present := True;
  95                return;
  96             end if;
  97
  98             Ptr := Ptr + 1;
  99
 100             --  Find out whether this is a -I- or regular -Ixxx switch
 101
 102             --  Note: -I switches are not recorded in the ALI file, since the
 103             --  meaning of the program depends on the source files compiled,
 104             --  not where they came from.
 105
 106             if Ptr = Max and then Switch_Chars (Ptr) = '-' then
 107                Look_In_Primary_Dir := False;
 108             else
 109                Add_Src_Search_Dir (Switch_Chars (Ptr .. Max));
 110             end if;
 111
 112          --  Processing of the --RTS switch. --RTS may have been modified by
 113          --  gcc into -fRTS (for GCC targets).
 114
 115          elsif Ptr + 3 <= Max
 116            and then (Switch_Chars (Ptr .. Ptr + 3) = "fRTS"
 117                        or else
 118                      Switch_Chars (Ptr .. Ptr + 3) = "-RTS")
 119          then
 120             Ptr := Ptr + 1;
 121
 122             if Ptr + 4 > Max
 123               or else Switch_Chars (Ptr + 3) /= '='
 124             then
 125                Osint.Fail ("missing path for --RTS");
 126             else
 127                --  Check that this is the first time --RTS is specified or if
 128                --  it is not the first time, the same path has been specified.
 129
 130                if RTS_Specified = null then
 131                   RTS_Specified := new String'(Switch_Chars (Ptr + 4 .. Max));
 132
 133                elsif
 134                  RTS_Specified.all /= Switch_Chars (Ptr + 4 .. Max)
 135                then
 136                   Osint.Fail
 137                     ("--RTS cannot be specified multiple times");
 138                end if;
 139
 140                --  Valid --RTS switch
 141
 142                Opt.No_Stdinc := True;
 143                Opt.RTS_Switch := True;
 144
 145                RTS_Src_Path_Name :=
 146                  Get_RTS_Search_Dir
 147                    (Switch_Chars (Ptr + 4 .. Max), Include);
 148
 149                RTS_Lib_Path_Name :=
 150                  Get_RTS_Search_Dir
 151                    (Switch_Chars (Ptr + 4 .. Max), Objects);
 152
 153                if RTS_Src_Path_Name /= null
 154                  and then RTS_Lib_Path_Name /= null
 155                then
 156                   --  Store the -fRTS switch (Note: Store_Compilation_Switch
 157                   --  changes -fRTS back into --RTS for the actual output).
 158
 159                   Store_Compilation_Switch (Switch_Chars);
 160
 161                elsif RTS_Src_Path_Name = null
 162                  and then RTS_Lib_Path_Name = null
 163                then
 164                   Osint.Fail ("RTS path not valid: missing " &
 165                               "adainclude and adalib directories");
 166
 167                elsif RTS_Src_Path_Name = null then
 168                   Osint.Fail ("RTS path not valid: missing " &
 169                               "adainclude directory");
 170
 171                elsif RTS_Lib_Path_Name = null then
 172                   Osint.Fail ("RTS path not valid: missing " &
 173                               "adalib directory");
 174                end if;
 175             end if;
 176
 177             --  There are no other switches not starting with -gnat
 178
 179          else
 180             Bad_Switch (Switch_Chars);
 181          end if;
 182
 183       --  Case of switch starting with -gnat
 184
 185       else
 186          Ptr := Ptr + 4;
 187
 188          --  Loop to scan through switches given in switch string
 189
 190          while Ptr <= Max loop
 191             First_Char := Ptr;
 192             Store_Switch := True;
 193
 194             C := Switch_Chars (Ptr);
 195
 196             case C is
 197
 198             when 'a' =>
 199                Ptr := Ptr + 1;
 200                Assertions_Enabled := True;
 201                Debug_Pragmas_Enabled := True;
 202
 203             --  Processing for A switch
 204
 205             when 'A' =>
 206                Ptr := Ptr + 1;
 207                Config_File := False;
 208
 209             --  Processing for b switch
 210
 211             when 'b' =>
 212                Ptr := Ptr + 1;
 213                Brief_Output := True;
 214
 215             --  Processing for c switch
 216
 217             when 'c' =>
 218                if not First_Switch then
 219                   Osint.Fail
 220                     ("-gnatc must be first if combined with other switches");
 221                end if;
 222
 223                Ptr := Ptr + 1;
 224                Operating_Mode := Check_Semantics;
 225
 226                if Tree_Output then
 227                   ASIS_Mode := True;
 228                end if;
 229
 230             --  Processing for d switch
 231
 232             when 'd' =>
 233                Store_Switch := False;
 234                Dot := False;
 235
 236                --  Note: for the debug switch, the remaining characters in this
 237                --  switch field must all be debug flags, since all valid switch
 238                --  characters are also valid debug characters.
 239
 240                --  Loop to scan out debug flags
 241
 242                while Ptr < Max loop
 243                   Ptr := Ptr + 1;
 244                   C := Switch_Chars (Ptr);
 245                   exit when C = ASCII.NUL or else C = '/' or else C = '-';
 246
 247                   if C in '1' .. '9' or else
 248                      C in 'a' .. 'z' or else
 249                      C in 'A' .. 'Z'
 250                   then
 251                      if Dot then
 252                         Set_Dotted_Debug_Flag (C);
 253                         Store_Compilation_Switch ("-gnatd." & C);
 254                      else
 255                         Set_Debug_Flag (C);
 256                         Store_Compilation_Switch ("-gnatd" & C);
 257                      end if;
 258
 259                   elsif C = '.' then
 260                      Dot := True;
 261
 262                   elsif Dot then
 263                      Bad_Switch ("-gnatd." & Switch_Chars (Ptr .. Max));
 264                   else
 265                      Bad_Switch ("-gnatd" & Switch_Chars (Ptr .. Max));
 266                   end if;
 267                end loop;
 268
 269                return;
 270
 271             --  Processing for D switch
 272
 273             when 'D' =>
 274                Ptr := Ptr + 1;
 275
 276                --  Note: -gnatD also sets -gnatx (to turn off cross-reference
 277                --  generation in the ali file) since otherwise this generation
 278                --  gets confused by the "wrong" Sloc values put in the tree.
 279
 280                Debug_Generated_Code := True;
 281                Xref_Active := False;
 282                Set_Debug_Flag ('g');
 283
 284             --  -gnate? (extended switches)
 285
 286             when 'e' =>
 287                Ptr := Ptr + 1;
 288
 289                --  The -gnate? switches are all double character switches
 290                --  so we must always have a character after the e.
 291
 292                if Ptr > Max then
 293                   Bad_Switch ("-gnate");
 294                end if;
 295
 296                case Switch_Chars (Ptr) is
 297
 298                   --  -gnatec (configuration pragmas)
 299
 300                   when 'c' =>
 301                      Store_Switch := False;
 302                      Ptr := Ptr + 1;
 303
 304                      --  There may be an equal sign between -gnatec and
 305                      --  the path name of the config file.
 306
 307                      if Ptr <= Max and then Switch_Chars (Ptr) = '=' then
 308                         Ptr := Ptr + 1;
 309                      end if;
 310
 311                      if Ptr > Max then
 312                         Bad_Switch ("-gnatec");
 313                      end if;
 314
 315                      declare
 316                         Config_File_Name : constant String_Access :=
 317                                              new String'
 318                                                   (Switch_Chars (Ptr .. Max));
 319
 320                      begin
 321                         if Config_File_Names = null then
 322                            Config_File_Names :=
 323                              new String_List'(1 => Config_File_Name);
 324
 325                         else
 326                            declare
 327                               New_Names : constant String_List_Access :=
 328                                             new String_List
 329                                               (1 ..
 330                                                Config_File_Names'Length + 1);
 331
 332                            begin
 333                               for Index in Config_File_Names'Range loop
 334                                  New_Names (Index) :=
 335                                    Config_File_Names (Index);
 336                                  Config_File_Names (Index) := null;
 337                               end loop;
 338
 339                               New_Names (New_Names'Last) := Config_File_Name;
 340                               Free (Config_File_Names);
 341                               Config_File_Names := New_Names;
 342                            end;
 343                         end if;
 344                      end;
 345
 346                      return;
 347
 348                   --  -gnateD switch (preprocessing symbol definition)
 349
 350                   when 'D' =>
 351                      Store_Switch := False;
 352                      Ptr := Ptr + 1;
 353
 354                      if Ptr > Max then
 355                         Bad_Switch ("-gnateD");
 356                      end if;
 357
 358                      Add_Symbol_Definition (Switch_Chars (Ptr .. Max));
 359
 360                      --  Store the switch
 361
 362                      Store_Compilation_Switch
 363                        ("-gnateD" & Switch_Chars (Ptr .. Max));
 364                      Ptr := Max + 1;
 365
 366                   --  -gnatef (full source path for brief error messages)
 367
 368                   when 'f' =>
 369                      Store_Switch := False;
 370                      Ptr := Ptr + 1;
 371                      Full_Path_Name_For_Brief_Errors := True;
 372                      return;
 373
 374                   --  -gnateI (index of unit in multi-unit source)
 375
 376                   when 'I' =>
 377                      Ptr := Ptr + 1;
 378                      Scan_Pos (Switch_Chars, Max, Ptr, Multiple_Unit_Index, C);
 379
 380                   --  -gnatem (mapping file)
 381
 382                   when 'm' =>
 383                      Store_Switch := False;
 384                      Ptr := Ptr + 1;
 385
 386                      --  There may be an equal sign between -gnatem and
 387                      --  the path name of the mapping file.
 388
 389                      if Ptr <= Max and then Switch_Chars (Ptr) = '=' then
 390                         Ptr := Ptr + 1;
 391                      end if;
 392
 393                      if Ptr > Max then
 394                         Bad_Switch ("-gnatem");
 395                      end if;
 396
 397                      Mapping_File_Name :=
 398                        new String'(Switch_Chars (Ptr .. Max));
 399                      return;
 400
 401                   --  -gnatep (preprocessing data file)
 402
 403                   when 'p' =>
 404                      Store_Switch := False;
 405                      Ptr := Ptr + 1;
 406
 407                      --  There may be an equal sign between -gnatep and
 408                      --  the path name of the mapping file.
 409
 410                      if Ptr <= Max and then Switch_Chars (Ptr) = '=' then
 411                         Ptr := Ptr + 1;
 412                      end if;
 413
 414                      if Ptr > Max then
 415                         Bad_Switch ("-gnatep");
 416                      end if;
 417
 418                      Preprocessing_Data_File :=
 419                        new String'(Switch_Chars (Ptr .. Max));
 420
 421                      --  Store the switch, normalizing to -gnatep=
 422
 423                      Store_Compilation_Switch
 424                        ("-gnatep=" & Preprocessing_Data_File.all);
 425
 426                      Ptr := Max + 1;
 427
 428                   when 'z' =>
 429                      Store_Switch := False;
 430                      Disable_Switch_Storing;
 431                      Ptr := Ptr + 1;
 432
 433                   --  All other -gnate? switches are unassigned
 434
 435                   when others =>
 436                      Bad_Switch ("-gnate" & Switch_Chars (Ptr .. Max));
 437                end case;
 438
 439             --  -gnatE (dynamic elaboration checks)
 440
 441             when 'E' =>
 442                Ptr := Ptr + 1;
 443                Dynamic_Elaboration_Checks := True;
 444
 445             --  -gnatf (full error messages)
 446
 447             when 'f' =>
 448                Ptr := Ptr + 1;
 449                All_Errors_Mode := True;
 450
 451             --  Processing for F switch
 452
 453             when 'F' =>
 454                Ptr := Ptr + 1;
 455                External_Name_Exp_Casing := Uppercase;
 456                External_Name_Imp_Casing := Uppercase;
 457
 458             --  Processing for g switch
 459
 460             when 'g' =>
 461                Ptr := Ptr + 1;
 462                GNAT_Mode := True;
 463                Identifier_Character_Set := 'n';
 464                System_Extend_Unit := Empty;
 465                Warning_Mode := Treat_As_Error;
 466
 467                --  Set Ada 2005 mode explicitly. We don't want to rely on the
 468                --  implicit setting here, since for example, we want
 469                --  Preelaborate_05 treated as Preelaborate
 470
 471                Ada_Version := Ada_05;
 472                Ada_Version_Explicit := Ada_Version;
 473
 474                --  Set default warnings for -gnatg
 475
 476                Check_Unreferenced              := True;
 477                Check_Unreferenced_Formals      := True;
 478                Check_Withs                     := True;
 479                Constant_Condition_Warnings     := True;
 480                Implementation_Unit_Warnings    := True;
 481                Ineffective_Inline_Warnings     := True;
 482                Warn_On_Assertion_Failure       := True;
 483                Warn_On_Assumed_Low_Bound       := True;
 484                Warn_On_Bad_Fixed_Value         := True;
 485                Warn_On_Constant                := True;
 486                Warn_On_Export_Import           := True;
 487                Warn_On_Modified_Unread         := True;
 488                Warn_On_No_Value_Assigned       := True;
 489                Warn_On_Non_Local_Exception     := False;
 490                Warn_On_Obsolescent_Feature     := True;
 491                Warn_On_Redundant_Constructs    := True;
 492                Warn_On_Object_Renames_Function := True;
 493                Warn_On_Unchecked_Conversion    := True;
 494                Warn_On_Unrecognized_Pragma     := True;
 495
 496                Set_GNAT_Style_Check_Options;
 497
 498             --  Processing for G switch
 499
 500             when 'G' =>
 501                Ptr := Ptr + 1;
 502                Print_Generated_Code := True;
 503
 504             --  Processing for h switch
 505
 506             when 'h' =>
 507                Ptr := Ptr + 1;
 508                Usage_Requested := True;
 509
 510             --  Processing for H switch
 511
 512             when 'H' =>
 513                Ptr := Ptr + 1;
 514                HLO_Active := True;
 515
 516             --  Processing for i switch
 517
 518             when 'i' =>
 519                if Ptr = Max then
 520                   Bad_Switch ("-gnati");
 521                end if;
 522
 523                Ptr := Ptr + 1;
 524                C := Switch_Chars (Ptr);
 525
 526                if C in '1' .. '5'
 527                  or else C = '8'
 528                  or else C = '9'
 529                  or else C = 'p'
 530                  or else C = 'f'
 531                  or else C = 'n'
 532                  or else C = 'w'
 533                then
 534                   Identifier_Character_Set := C;
 535                   Ptr := Ptr + 1;
 536
 537                else
 538                   Bad_Switch ("-gnati" & Switch_Chars (Ptr .. Max));
 539                end if;
 540
 541             --  Processing for I switch
 542
 543             when 'I' =>
 544                Ptr := Ptr + 1;
 545                Ignore_Rep_Clauses := True;
 546
 547             --  Processing for j switch
 548
 549             when 'j' =>
 550                Ptr := Ptr + 1;
 551
 552                --  There may be an equal sign between -gnatj and the value
 553
 554                if Ptr <= Max and then Switch_Chars (Ptr) = '=' then
 555                   Ptr := Ptr + 1;
 556                end if;
 557
 558                Scan_Nat (Switch_Chars, Max, Ptr, Error_Msg_Line_Length, C);
 559
 560             --  Processing for k switch
 561
 562             when 'k' =>
 563                Ptr := Ptr + 1;
 564                   Scan_Pos
 565                     (Switch_Chars, Max, Ptr, Maximum_File_Name_Length, C);
 566
 567             --  Processing for l switch
 568
 569             when 'l' =>
 570                Ptr := Ptr + 1;
 571                Full_List := True;
 572
 573                --  There may be an equal sign between -gnatl and a file name
 574
 575                if Ptr <= Max and then Switch_Chars (Ptr) = '=' then
 576                   if Ptr = Max then
 577                      Osint.Fail ("file name for -gnatl= is null");
 578                   else
 579                      Opt.Full_List_File_Name :=
 580                        new String'(Switch_Chars (Ptr + 1 .. Max));
 581                      Ptr := Max + 1;
 582                   end if;
 583                end if;
 584
 585             --  Processing for L switch
 586
 587             when 'L' =>
 588                Ptr := Ptr + 1;
 589                Dump_Source_Text := True;
 590
 591             --  Processing for m switch
 592
 593             when 'm' =>
 594                Ptr := Ptr + 1;
 595
 596                --  There may be an equal sign between -gnatm and the value
 597
 598                if Ptr <= Max and then Switch_Chars (Ptr) = '=' then
 599                   Ptr := Ptr + 1;
 600                end if;
 601
 602                Scan_Nat (Switch_Chars, Max, Ptr, Maximum_Errors, C);
 603
 604             --  Processing for n switch
 605
 606             when 'n' =>
 607                Ptr := Ptr + 1;
 608                Inline_Active := True;
 609
 610             --  Processing for N switch
 611
 612             when 'N' =>
 613                Ptr := Ptr + 1;
 614                Inline_Active := True;
 615                Front_End_Inlining := True;
 616
 617             --  Processing for o switch
 618
 619             when 'o' =>
 620                Ptr := Ptr + 1;
 621                Suppress_Options (Overflow_Check) := False;
 622                Opt.Enable_Overflow_Checks := True;
 623
 624             --  Processing for O switch
 625
 626             when 'O' =>
 627                Store_Switch := False;
 628                Ptr := Ptr + 1;
 629                Output_File_Name_Present := True;
 630
 631             --  Processing for p switch
 632
 633             when 'p' =>
 634                Ptr := Ptr + 1;
 635
 636                --  Set all specific options as well as All_Checks in the
 637                --  Suppress_Options array, excluding Elaboration_Check, since
 638                --  this is treated specially because we do not want -gnatp to
 639                --  disable static elaboration processing.
 640
 641                for J in Suppress_Options'Range loop
 642                   if J /= Elaboration_Check then
 643                      Suppress_Options (J) := True;
 644                   end if;
 645                end loop;
 646
 647                Validity_Checks_On         := False;
 648                Opt.Suppress_Checks        := True;
 649                Opt.Enable_Overflow_Checks := False;
 650
 651             --  Processing for P switch
 652
 653             when 'P' =>
 654                Ptr := Ptr + 1;
 655                Polling_Required := True;
 656
 657             --  Processing for q switch
 658
 659             when 'q' =>
 660                Ptr := Ptr + 1;
 661                Try_Semantics := True;
 662
 663             --  Processing for q switch
 664
 665             when 'Q' =>
 666                Ptr := Ptr + 1;
 667                Force_ALI_Tree_File := True;
 668                Try_Semantics := True;
 669
 670             --  Processing for R switch
 671
 672             when 'R' =>
 673                Back_Annotate_Rep_Info := True;
 674                List_Representation_Info := 1;
 675
 676                Ptr := Ptr + 1;
 677                while Ptr <= Max loop
 678                   C := Switch_Chars (Ptr);
 679
 680                   if C in '1' .. '3' then
 681                      List_Representation_Info :=
 682                        Character'Pos (C) - Character'Pos ('0');
 683
 684                   elsif Switch_Chars (Ptr) = 's' then
 685                      List_Representation_Info_To_File := True;
 686
 687                   elsif Switch_Chars (Ptr) = 'm' then
 688                      List_Representation_Info_Mechanisms := True;
 689
 690                   else
 691                      Bad_Switch ("-gnatR" & Switch_Chars (Ptr .. Max));
 692                   end if;
 693
 694                   Ptr := Ptr + 1;
 695                end loop;
 696
 697             --  Processing for s switch
 698
 699             when 's' =>
 700                if not First_Switch then
 701                   Osint.Fail
 702                     ("-gnats must be first if combined with other switches");
 703                end if;
 704
 705                Ptr := Ptr + 1;
 706                Operating_Mode := Check_Syntax;
 707
 708             --  Processing for S switch
 709
 710             when 'S' =>
 711                Print_Standard := True;
 712                Ptr := Ptr + 1;
 713
 714             --  Processing for t switch
 715
 716             when 't' =>
 717                Ptr := Ptr + 1;
 718                Tree_Output := True;
 719
 720                if Operating_Mode = Check_Semantics then
 721                   ASIS_Mode := True;
 722                end if;
 723
 724                Back_Annotate_Rep_Info := True;
 725
 726             --  Processing for T switch
 727
 728             when 'T' =>
 729                Ptr := Ptr + 1;
 730                Scan_Pos (Switch_Chars, Max, Ptr, Table_Factor, C);
 731
 732             --  Processing for u switch
 733
 734             when 'u' =>
 735                Ptr := Ptr + 1;
 736                List_Units := True;
 737
 738             --  Processing for U switch
 739
 740             when 'U' =>
 741                Ptr := Ptr + 1;
 742                Unique_Error_Tag := True;
 743
 744             --  Processing for v switch
 745
 746             when 'v' =>
 747                Ptr := Ptr + 1;
 748                Verbose_Mode := True;
 749
 750             --  Processing for V switch
 751
 752             when 'V' =>
 753                Store_Switch := False;
 754                Ptr := Ptr + 1;
 755
 756                if Ptr > Max then
 757                   Bad_Switch ("-gnatV");
 758
 759                else
 760                   declare
 761                      OK  : Boolean;
 762
 763                   begin
 764                      Set_Validity_Check_Options
 765                        (Switch_Chars (Ptr .. Max), OK, Ptr);
 766
 767                      if not OK then
 768                         Bad_Switch ("-gnatV" & Switch_Chars (Ptr .. Max));
 769                      end if;
 770
 771                      for Index in First_Char + 1 .. Max loop
 772                         Store_Compilation_Switch
 773                           ("-gnatV" & Switch_Chars (Index));
 774                      end loop;
 775                   end;
 776                end if;
 777
 778                Ptr := Max + 1;
 779
 780             --  Processing for w switch
 781
 782             when 'w' =>
 783                Store_Switch := False;
 784                Ptr := Ptr + 1;
 785
 786                if Ptr > Max then
 787                   Bad_Switch ("-gnatw");
 788                end if;
 789
 790                while Ptr <= Max loop
 791                   C := Switch_Chars (Ptr);
 792
 793                   --  Case of dot switch
 794
 795                   if C = '.' and then Ptr < Max then
 796                      Ptr := Ptr + 1;
 797                      C := Switch_Chars (Ptr);
 798
 799                      if Set_Dot_Warning_Switch (C) then
 800                         Store_Compilation_Switch ("-gnatw." & C);
 801                      else
 802                         Bad_Switch ("-gnatw." & Switch_Chars (Ptr .. Max));
 803                      end if;
 804
 805                      --  Normal case, no dot
 806
 807                   else
 808                      if Set_Warning_Switch (C) then
 809                         Store_Compilation_Switch ("-gnatw" & C);
 810                      else
 811                         Bad_Switch ("-gnatw" & Switch_Chars (Ptr .. Max));
 812                      end if;
 813                   end if;
 814
 815                   Ptr := Ptr + 1;
 816                end loop;
 817
 818                return;
 819
 820             --  Processing for W switch
 821
 822             when 'W' =>
 823                Ptr := Ptr + 1;
 824
 825                if Ptr > Max then
 826                   Bad_Switch ("-gnatW");
 827                end if;
 828
 829                begin
 830                   Wide_Character_Encoding_Method :=
 831                     Get_WC_Encoding_Method (Switch_Chars (Ptr));
 832                exception
 833                   when Constraint_Error =>
 834                      Bad_Switch ("-gnatW" & Switch_Chars (Ptr .. Max));
 835                end;
 836
 837                Wide_Character_Encoding_Method_Specified := True;
 838
 839                Upper_Half_Encoding :=
 840                  Wide_Character_Encoding_Method in
 841                    WC_Upper_Half_Encoding_Method;
 842
 843                Ptr := Ptr + 1;
 844
 845             --  Processing for x switch
 846
 847             when 'x' =>
 848                Ptr := Ptr + 1;
 849                Xref_Active := False;
 850
 851             --  Processing for X switch
 852
 853             when 'X' =>
 854                Ptr := Ptr + 1;
 855                Extensions_Allowed := True;
 856
 857             --  Processing for y switch
 858
 859             when 'y' =>
 860                Ptr := Ptr + 1;
 861
 862                if Ptr > Max then
 863                   Set_Default_Style_Check_Options;
 864
 865                else
 866                   Store_Switch := False;
 867
 868                   declare
 869                      OK  : Boolean;
 870
 871                   begin
 872                      Set_Style_Check_Options
 873                        (Switch_Chars (Ptr .. Max), OK, Ptr);
 874
 875                      if not OK then
 876                         Osint.Fail
 877                           ("bad -gnaty switch (" &
 878                            Style_Msg_Buf (1 .. Style_Msg_Len) & ')');
 879                      end if;
 880
 881                      Ptr := First_Char + 1;
 882                      while Ptr <= Max loop
 883                         if Switch_Chars (Ptr) = 'M' then
 884                            First_Char := Ptr;
 885                            loop
 886                               Ptr := Ptr + 1;
 887                               exit when Ptr > Max
 888                                 or else Switch_Chars (Ptr) not in '0' .. '9';
 889                            end loop;
 890
 891                            Store_Compilation_Switch
 892                              ("-gnaty" & Switch_Chars (First_Char .. Ptr - 1));
 893
 894                         else
 895                            Store_Compilation_Switch
 896                              ("-gnaty" & Switch_Chars (Ptr));
 897                            Ptr := Ptr + 1;
 898                         end if;
 899                      end loop;
 900                   end;
 901                end if;
 902
 903             --  Processing for z switch
 904
 905             when 'z' =>
 906                Ptr := Ptr + 1;
 907
 908                --  Allowed for compiler only if this is the only
 909                --  -z switch, we do not allow multiple occurrences
 910
 911                if Distribution_Stub_Mode = No_Stubs then
 912                   case Switch_Chars (Ptr) is
 913                      when 'r' =>
 914                         Distribution_Stub_Mode := Generate_Receiver_Stub_Body;
 915
 916                      when 'c' =>
 917                         Distribution_Stub_Mode := Generate_Caller_Stub_Body;
 918
 919                      when others =>
 920                         Bad_Switch ("-gnatz" & Switch_Chars (Ptr .. Max));
 921                   end case;
 922
 923                   Ptr := Ptr + 1;
 924                end if;
 925
 926             --  Processing for Z switch
 927
 928             when 'Z' =>
 929                Ptr := Ptr + 1;
 930                Osint.Fail
 931                  ("-gnatZ is no longer supported: consider using --RTS=zcx");
 932
 933             --  Processing for 83 switch
 934
 935             when '8' =>
 936                if Ptr = Max then
 937                   Bad_Switch ("-gnat8");
 938                end if;
 939
 940                Ptr := Ptr + 1;
 941
 942                if Switch_Chars (Ptr) /= '3' then
 943                   Bad_Switch ("-gnat8" & Switch_Chars (Ptr .. Max));
 944                else
 945                   Ptr := Ptr + 1;
 946                   Ada_Version := Ada_83;
 947                   Ada_Version_Explicit := Ada_Version;
 948                end if;
 949
 950             --  Processing for 95 switch
 951
 952             when '9' =>
 953                if Ptr = Max then
 954                   Bad_Switch ("-gnat9");
 955                end if;
 956
 957                Ptr := Ptr + 1;
 958
 959                if Switch_Chars (Ptr) /= '5' then
 960                   Bad_Switch ("-gnat9" & Switch_Chars (Ptr .. Max));
 961                else
 962                   Ptr := Ptr + 1;
 963                   Ada_Version := Ada_95;
 964                   Ada_Version_Explicit := Ada_Version;
 965                end if;
 966
 967             --  Processing for 05 switch
 968
 969             when '0' =>
 970                if Ptr = Max then
 971                   Bad_Switch ("-gnat0");
 972                end if;
 973
 974                Ptr := Ptr + 1;
 975
 976                if Switch_Chars (Ptr) /= '5' then
 977                   Bad_Switch ("-gnat0" & Switch_Chars (Ptr .. Max));
 978                else
 979                   Ptr := Ptr + 1;
 980                   Ada_Version := Ada_05;
 981                   Ada_Version_Explicit := Ada_Version;
 982                end if;
 983
 984             --  Ignore extra switch character
 985
 986             when '/' | '-' =>
 987                Ptr := Ptr + 1;
 988
 989             --  Anything else is an error (illegal switch character)
 990
 991             when others =>
 992                Bad_Switch ("-gnat" & Switch_Chars (Ptr .. Max));
 993             end case;
 994
 995             if Store_Switch then
 996                Store_Compilation_Switch
 997                  ("-gnat" & Switch_Chars (First_Char .. Ptr - 1));
 998             end if;
 999
1000             First_Switch := False;
1001          end loop;
1002       end if;
1003    end Scan_Front_End_Switches;
1004
1005 end Switch.C;