aboutsummaryrefslogtreecommitdiff
path: root/gcc/ada/switch-c.adb
blob: 5502290f00afec175804cff15896199982da5aa7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                             S W I T C H - C                              --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--                                                                          --
--          Copyright (C) 2001-2002 Free Software Foundation, Inc.          --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
-- MA 02111-1307, USA.                                                      --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

with Debug;    use Debug;
with Lib;      use Lib;
with Osint;    use Osint;
with Opt;      use Opt;
with Types;    use Types;
with Validsw;  use Validsw;
with Stylesw;  use Stylesw;

with System.WCh_Con; use System.WCh_Con;

package body Switch.C is

   -----------------------------
   -- Scan_Front_End_Switches --
   -----------------------------

   procedure Scan_Front_End_Switches (Switch_Chars : String) is
      Switch_Starts_With_Gnat : Boolean;
      --  True if first four switch characters are "gnat"

      First_Switch : Boolean := True;
      --  False for all but first switch

      Ptr : Integer := Switch_Chars'First;
      Max : constant Integer := Switch_Chars'Last;
      C   : Character := ' ';

      Store_Switch : Boolean  := True;
      First_Char   : Integer  := Ptr;
      Storing      : String   := Switch_Chars;
      First_Stored : Positive := Ptr + 1;
      --  The above need comments ???

   begin
      --  Skip past the initial character (must be the switch character)

      if Ptr = Max then
         raise Bad_Switch;
      else
         Ptr := Ptr + 1;
      end if;

      --  Remove "gnat" from the switch, if present

      Switch_Starts_With_Gnat :=
        Ptr + 3 <= Max and then Switch_Chars (Ptr .. Ptr + 3) = "gnat";

      if Switch_Starts_With_Gnat then
         Ptr := Ptr + 4;
         First_Stored := Ptr;
      end if;

      --  Loop to scan through switches given in switch string

      while Ptr <= Max loop
         Store_Switch := True;
         First_Char := Ptr;
         C := Switch_Chars (Ptr);

         --  Processing for a switch

         case Switch_Starts_With_Gnat is

            when False =>
            --  There are only two front-end switches that
            --  do not start with -gnat, namely -I and --RTS

               if Switch_Chars (Ptr) = 'I' then
                  Store_Switch := False;

                  Ptr := Ptr + 1;

                  if Ptr > Max then
                     raise Bad_Switch;
                  end if;

                  --  Find out whether this is a -I- or regular -Ixxx switch

                  if Ptr = Max and then Switch_Chars (Ptr) = '-' then
                     Look_In_Primary_Dir := False;

                  else
                     Add_Src_Search_Dir (Switch_Chars (Ptr .. Max));
                  end if;

                  Ptr := Max + 1;

               --  Processing of the --RTS switch. --RTS has been modified by
               --  gcc and is now of the form -fRTS
               elsif Ptr + 3 <= Max and then
                 Switch_Chars (Ptr .. Ptr + 3) = "fRTS"
               then
                  Ptr := Ptr + 1;

                  if Ptr + 4 > Max or else Switch_Chars (Ptr + 3) /= '=' then
                     Osint.Fail ("missing path for --RTS");
                  else

                     --  valid --RTS switch
                     Opt.No_Stdinc := True;
                     Opt.RTS_Switch := True;

                     declare
                        Src_Path_Name : String_Ptr := Get_RTS_Search_Dir
                          (Switch_Chars (Ptr + 4 .. Max), Include);
                        Lib_Path_Name : String_Ptr := Get_RTS_Search_Dir
                          (Switch_Chars (Ptr + 4 .. Max), Objects);
                     begin
                        if Src_Path_Name /= null and then
                          Lib_Path_Name /= null
                        then
                           Add_Search_Dirs (Src_Path_Name, Include);
                           Add_Search_Dirs (Lib_Path_Name, Objects);
                           Ptr := Max + 1;
                        elsif  Src_Path_Name = null
                          and Lib_Path_Name = null then
                           Osint.Fail ("RTS path not valid: missing " &
                                       "adainclude and adalib directories");
                        elsif Src_Path_Name = null then
                           Osint.Fail ("RTS path not valid: missing " &
                                       "adainclude directory");
                        elsif  Lib_Path_Name = null then
                           Osint.Fail ("RTS path not valid: missing " &
                                       "adalib directory");
                        end if;
                     end;
                  end if;
               else
                  raise Bad_Switch;
               end if;

         when True =>
            --  Process -gnat* options

            case C is

            when 'a' =>
               Ptr := Ptr + 1;
               Assertions_Enabled := True;

            --  Processing for A switch

            when 'A' =>
               Ptr := Ptr + 1;
               Config_File := False;

            --  Processing for b switch

            when 'b' =>
               Ptr := Ptr + 1;
               Brief_Output := True;

            --  Processing for c switch

            when 'c' =>
               if not First_Switch then
                  Osint.Fail
                    ("-gnatc myust be first if combined with other switches");
               end if;

               Ptr := Ptr + 1;
               Operating_Mode := Check_Semantics;

            --  Processing for C switch

            when 'C' =>
               Ptr := Ptr + 1;
               Compress_Debug_Names := True;

            --  Processing for d switch

            when 'd' =>
               Store_Switch := False;
               Storing (First_Stored) := 'd';
               --  Note: for the debug switch, the remaining characters in this
               --  switch field must all be debug flags, since all valid switch
               --  characters are also valid debug characters.

               --  Loop to scan out debug flags

               while Ptr < Max loop
                  Ptr := Ptr + 1;
                  C := Switch_Chars (Ptr);
                  exit when C = ASCII.NUL or else C = '/' or else C = '-';

                  if C in '1' .. '9' or else
                     C in 'a' .. 'z' or else
                     C in 'A' .. 'Z'
                  then
                     Set_Debug_Flag (C);
                     Storing (First_Stored + 1) := C;
                     Store_Compilation_Switch
                       (Storing (Storing'First .. First_Stored + 1));

                  else
                     raise Bad_Switch;
                  end if;
               end loop;

               --  Make sure Zero_Cost_Exceptions is set if gnatdX set. This
               --  is for backwards compatibility with old versions and usage.

               if Debug_Flag_XX then
                  Zero_Cost_Exceptions_Set := True;
                  Zero_Cost_Exceptions_Val := True;
               end if;

               return;

            --  Processing for D switch

            when 'D' =>
               Ptr := Ptr + 1;

               --  Note: -gnatD also sets -gnatx (to turn off cross-reference
               --  generation in the ali file) since otherwise this generation
               --  gets confused by the "wrong" Sloc values put in the tree.

               Debug_Generated_Code := True;
               Xref_Active := False;
               Set_Debug_Flag ('g');

            --  Processing for e switch

            when 'e' =>
               Ptr := Ptr + 1;

               if Ptr > Max then
                  raise Bad_Switch;
               end if;

               case Switch_Chars (Ptr) is

                  --  Configuration pragmas

                  when 'c' =>
                     Store_Switch := False;
                     Ptr := Ptr + 1;

                     if Ptr > Max then
                        raise Bad_Switch;
                     end if;

                     Config_File_Name :=
                        new String'(Switch_Chars (Ptr .. Max));

                     return;

                  --  Mapping file

                  when 'm' =>
                     Store_Switch := False;
                     Ptr := Ptr + 1;

                     if Ptr > Max then
                        raise Bad_Switch;
                     end if;

                     Mapping_File_Name :=
                       new String'(Switch_Chars (Ptr .. Max));
                     return;

                  when others =>
                     raise Bad_Switch;
               end case;

            --  Processing for E switch

            when 'E' =>
               Ptr := Ptr + 1;
               Dynamic_Elaboration_Checks := True;

            --  Processing for f switch

            when 'f' =>
               Ptr := Ptr + 1;
               All_Errors_Mode := True;

            --  Processing for F switch

            when 'F' =>
               Ptr := Ptr + 1;
               External_Name_Exp_Casing := Uppercase;
               External_Name_Imp_Casing := Uppercase;

            --  Processing for g switch

            when 'g' =>
               Ptr := Ptr + 1;
               GNAT_Mode                := True;
               Identifier_Character_Set := 'n';
               Warning_Mode             := Treat_As_Error;
               Check_Unreferenced       := True;
               Check_Withs              := True;

               Set_Default_Style_Check_Options;

            --  Processing for G switch

            when 'G' =>
               Ptr := Ptr + 1;
               Print_Generated_Code := True;

            --  Processing for h switch

            when 'h' =>
               Ptr := Ptr + 1;
               Usage_Requested := True;

            --  Processing for H switch

            when 'H' =>
               Ptr := Ptr + 1;
               HLO_Active := True;

            --  Processing for i switch

            when 'i' =>
               if Ptr = Max then
                  raise Bad_Switch;
               end if;

               Ptr := Ptr + 1;
               C := Switch_Chars (Ptr);

               if C in '1' .. '5'
                 or else C = '8'
                 or else C = '9'
                 or else C = 'p'
                 or else C = 'f'
                 or else C = 'n'
                 or else C = 'w'
               then
                  Identifier_Character_Set := C;
                  Ptr := Ptr + 1;

               else
                  raise Bad_Switch;
               end if;

            --  Processing for k switch

            when 'k' =>
               Ptr := Ptr + 1;
               Scan_Pos (Switch_Chars, Max, Ptr, Maximum_File_Name_Length);

            --  Processing for l switch

            when 'l' =>
               Ptr := Ptr + 1;
               Full_List := True;

            --  Processing for L switch

            when 'L' =>
               Ptr := Ptr + 1;
               Zero_Cost_Exceptions_Set := True;
               Zero_Cost_Exceptions_Val := False;

            --  Processing for m switch

            when 'm' =>
               Ptr := Ptr + 1;
               Scan_Pos (Switch_Chars, Max, Ptr, Maximum_Errors);

            --  Processing for n switch

            when 'n' =>
               Ptr := Ptr + 1;
               Inline_Active := True;

            --  Processing for N switch

            when 'N' =>
               Ptr := Ptr + 1;
               Inline_Active := True;
               Front_End_Inlining := True;

            --  Processing for o switch

            when 'o' =>
               Ptr := Ptr + 1;
               Suppress_Options.Overflow_Checks := False;
               Opt.Enable_Overflow_Checks := True;

            --  Processing for O switch

            when 'O' =>
               Ptr := Ptr + 1;
               Output_File_Name_Present := True;

            --  Processing for p switch

            when 'p' =>
               Ptr := Ptr + 1;
               Suppress_Options.Access_Checks        := True;
               Suppress_Options.Accessibility_Checks := True;
               Suppress_Options.Discriminant_Checks  := True;
               Suppress_Options.Division_Checks      := True;
               Suppress_Options.Elaboration_Checks   := True;
               Suppress_Options.Index_Checks         := True;
               Suppress_Options.Length_Checks        := True;
               Suppress_Options.Overflow_Checks      := True;
               Suppress_Options.Range_Checks         := True;
               Suppress_Options.Storage_Checks       := True;
               Suppress_Options.Tag_Checks           := True;

               Validity_Checks_On := False;
               Opt.Suppress_Checks := True;
               Opt.Enable_Overflow_Checks := False;

            --  Processing for P switch

            when 'P' =>
               Ptr := Ptr + 1;
               Polling_Required := True;

            --  Processing for q switch

            when 'q' =>
               Ptr := Ptr + 1;
               Try_Semantics := True;

            --  Processing for q switch

            when 'Q' =>
               Ptr := Ptr + 1;
               Force_ALI_Tree_File := True;
               Try_Semantics := True;

            --  Processing for R switch

            when 'R' =>
               Ptr := Ptr + 1;
               Back_Annotate_Rep_Info := True;

               if Ptr <= Max
                 and then Switch_Chars (Ptr) in '0' .. '9'
               then
                  C := Switch_Chars (Ptr);

                  if C in '4' .. '9' then
                     raise Bad_Switch;
                  else
                     List_Representation_Info :=
                       Character'Pos (C) - Character'Pos ('0');
                     Ptr := Ptr + 1;
                  end if;

                  if Ptr <= Max and then Switch_Chars (Ptr) = 's' then
                     Ptr := Ptr + 1;

                     if List_Representation_Info /= 0 then
                        List_Representation_Info_To_File := True;
                     end if;
                  end if;

               else
                  List_Representation_Info := 1;
               end if;

            --  Processing for s switch

            when 's' =>
               if not First_Switch then
                  Osint.Fail
                    ("-gnats myust be first if combined with other switches");
               end if;

               Ptr := Ptr + 1;
               Operating_Mode := Check_Syntax;

            --  Processing for t switch

            when 't' =>
               Ptr := Ptr + 1;
               Tree_Output := True;
               Back_Annotate_Rep_Info := True;

            --  Processing for T switch

            when 'T' =>
               Ptr := Ptr + 1;
               Scan_Pos (Switch_Chars, Max, Ptr, Table_Factor);

            --  Processing for u switch

            when 'u' =>
               Ptr := Ptr + 1;
               List_Units := True;

            --  Processing for U switch

            when 'U' =>
               Ptr := Ptr + 1;
               Unique_Error_Tag := True;

            --  Processing for v switch

            when 'v' =>
               Ptr := Ptr + 1;
               Verbose_Mode := True;

            --  Processing for V switch

            when 'V' =>
               Store_Switch := False;
               Storing (First_Stored) := 'V';
               Ptr := Ptr + 1;

               if Ptr > Max then
                  raise Bad_Switch;

               else
                  declare
                     OK  : Boolean;

                  begin
                     Set_Validity_Check_Options
                       (Switch_Chars (Ptr .. Max), OK, Ptr);

                     if not OK then
                        raise Bad_Switch;
                     end if;

                     for Index in First_Char + 1 .. Max loop
                        Storing (First_Stored + 1) :=
                          Switch_Chars (Index);
                        Store_Compilation_Switch
                          (Storing (Storing'First .. First_Stored + 1));
                     end loop;
                  end;
               end if;

               Ptr := Max + 1;

            --  Processing for w switch

            when 'w' =>
               Store_Switch := False;
               Storing (First_Stored) := 'w';
               Ptr := Ptr + 1;

               if Ptr > Max then
                  raise Bad_Switch;
               end if;

               while Ptr <= Max loop
                  C := Switch_Chars (Ptr);

                  case C is

                     when 'a' =>
                        Constant_Condition_Warnings     := True;
                        Elab_Warnings                   := True;
                        Check_Unreferenced              := True;
                        Check_Withs                     := True;
                        Check_Unreferenced_Formals      := True;
                        Implementation_Unit_Warnings    := True;
                        Ineffective_Inline_Warnings     := True;
                        Warn_On_Redundant_Constructs    := True;

                     when 'A' =>
                        Constant_Condition_Warnings     := False;
                        Elab_Warnings                   := False;
                        Check_Unreferenced              := False;
                        Check_Withs                     := False;
                        Check_Unreferenced_Formals      := False;
                        Implementation_Unit_Warnings    := False;
                        Warn_On_Biased_Rounding         := False;
                        Warn_On_Dereference             := False;
                        Warn_On_Hiding                  := False;
                        Warn_On_Redundant_Constructs    := False;
                        Ineffective_Inline_Warnings     := False;

                     when 'b' =>
                        Warn_On_Biased_Rounding         := True;

                     when 'B' =>
                        Warn_On_Biased_Rounding         := False;

                     when 'c' =>
                        Constant_Condition_Warnings     := True;

                     when 'C' =>
                        Constant_Condition_Warnings     := False;

                     when 'd' =>
                        Warn_On_Dereference             := True;

                     when 'D' =>
                        Warn_On_Dereference             := False;

                     when 'e' =>
                        Warning_Mode                    := Treat_As_Error;

                     when 'f' =>
                        Check_Unreferenced_Formals      := True;

                     when 'F' =>
                        Check_Unreferenced_Formals      := False;

                     when 'h' =>
                        Warn_On_Hiding                  := True;

                     when 'H' =>
                        Warn_On_Hiding                  := False;

                     when 'i' =>
                        Implementation_Unit_Warnings    := True;

                     when 'I' =>
                        Implementation_Unit_Warnings    := False;

                     when 'l' =>
                        Elab_Warnings                   := True;

                     when 'L' =>
                        Elab_Warnings                   := False;

                     when 'o' =>
                        Address_Clause_Overlay_Warnings := True;

                     when 'O' =>
                        Address_Clause_Overlay_Warnings := False;

                     when 'p' =>
                        Ineffective_Inline_Warnings     := True;

                     when 'P' =>
                        Ineffective_Inline_Warnings     := False;

                     when 'r' =>
                        Warn_On_Redundant_Constructs    := True;

                     when 'R' =>
                        Warn_On_Redundant_Constructs    := False;

                     when 's' =>
                        Warning_Mode                    := Suppress;

                     when 'u' =>
                        Check_Unreferenced              := True;
                        Check_Withs                     := True;
                        Check_Unreferenced_Formals      := True;

                     when 'U' =>
                        Check_Unreferenced              := False;
                        Check_Withs                     := False;
                        Check_Unreferenced_Formals      := False;

                        --  Allow and ignore 'w' so that the old
                        --  format (e.g. -gnatwuwl) will work.

                     when 'w' =>
                        null;

                     when others =>
                        raise Bad_Switch;
                  end case;

                  if C /= 'w' then
                     Storing (First_Stored + 1) := C;
                     Store_Compilation_Switch
                       (Storing (Storing'First .. First_Stored + 1));
                  end if;

                  Ptr := Ptr + 1;
               end loop;

               return;

            --  Processing for W switch

            when 'W' =>
               Ptr := Ptr + 1;

               if Ptr > Max then
                  raise Bad_Switch;
               end if;

               for J in WC_Encoding_Method loop
                  if Switch_Chars (Ptr) = WC_Encoding_Letters (J) then
                     Wide_Character_Encoding_Method := J;
                     exit;

                  elsif J = WC_Encoding_Method'Last then
                     raise Bad_Switch;
                  end if;
               end loop;

               Upper_Half_Encoding :=
                 Wide_Character_Encoding_Method in
                 WC_Upper_Half_Encoding_Method;

               Ptr := Ptr + 1;

            --  Processing for x switch

            when 'x' =>
               Ptr := Ptr + 1;
               Xref_Active := False;

            --  Processing for X switch

            when 'X' =>
               Ptr := Ptr + 1;
               Extensions_Allowed := True;

            --  Processing for y switch

            when 'y' =>
               Ptr := Ptr + 1;

               if Ptr > Max then
                  Set_Default_Style_Check_Options;

               else
                  Store_Switch := False;
                  Storing (First_Stored) := 'y';

                  declare
                     OK  : Boolean;
                     Last_Stored : Integer;

                  begin
                     Set_Style_Check_Options
                       (Switch_Chars (Ptr .. Max), OK, Ptr);

                     if not OK then
                        raise Bad_Switch;
                     end if;

                     Ptr := First_Char + 1;

                     while Ptr <= Max loop
                        Last_Stored := First_Stored + 1;
                        Storing (Last_Stored) := Switch_Chars (Ptr);

                        if Switch_Chars (Ptr) = 'M' then
                           loop
                              Ptr := Ptr + 1;
                              exit when Ptr > Max
                                or else Switch_Chars (Ptr) not in '0' .. '9';
                              Last_Stored := Last_Stored + 1;
                              Storing (Last_Stored) := Switch_Chars (Ptr);
                           end loop;

                        else
                           Ptr := Ptr + 1;
                        end if;

                        Store_Compilation_Switch
                          (Storing (Storing'First .. Last_Stored));
                     end loop;
                  end;
               end if;

            --  Processing for z switch

            when 'z' =>
               Ptr := Ptr + 1;

               --  Allowed for compiler, only if this is the only
               --  -z switch, we do not allow multiple occurrences

               if Distribution_Stub_Mode = No_Stubs then
                  case Switch_Chars (Ptr) is
                     when 'r' =>
                        Distribution_Stub_Mode := Generate_Receiver_Stub_Body;

                     when 'c' =>
                        Distribution_Stub_Mode := Generate_Caller_Stub_Body;

                     when others =>
                        raise Bad_Switch;
                  end case;

                  Ptr := Ptr + 1;

               end if;

            --  Processing for Z switch

            when 'Z' =>
               Ptr := Ptr + 1;
               Zero_Cost_Exceptions_Set := True;
               Zero_Cost_Exceptions_Val := True;

            --  Processing for 83 switch

            when '8' =>

               if Ptr = Max then
                  raise Bad_Switch;
               end if;

               Ptr := Ptr + 1;

               if Switch_Chars (Ptr) /= '3' then
                  raise Bad_Switch;
               else
                  Ptr := Ptr + 1;
                  Ada_95 := False;
                  Ada_83 := True;
               end if;

            --  Ignore extra switch character

            when '/' | '-' =>
               Ptr := Ptr + 1;

            --  Anything else is an error (illegal switch character)

            when others =>
               raise Bad_Switch;
            end case;
         end case;

         if Store_Switch then
            Storing (First_Stored .. First_Stored + Ptr - First_Char - 1) :=
              Switch_Chars (First_Char .. Ptr - 1);
            Store_Compilation_Switch
              (Storing (Storing'First .. First_Stored + Ptr - First_Char - 1));
         end if;

         First_Switch := False;
      end loop;

   exception
      when Bad_Switch =>
         Osint.Fail ("invalid switch: ", (1 => C));

      when Bad_Switch_Value =>
         Osint.Fail ("numeric value too big for switch: ", (1 => C));

      when Missing_Switch_Value =>
         Osint.Fail ("missing numeric value for switch: ", (1 => C));

   end Scan_Front_End_Switches;

end Switch.C;