gcc/ada/usage.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                               U S A G E                                  --
   6 --                                                                          --
   7 --                                B o d y                                   --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2014, 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 --  Warning: the output of this usage for warnings is duplicated in the GNAT
  27 --  reference manual. Be sure to update that if you change the warning list.
  28
  29 with Targparm; use Targparm;
  30 with Namet;    use Namet;
  31 with Opt;      use Opt;
  32 with Osint;    use Osint;
  33 with Output;   use Output;
  34
  35 with System.WCh_Con; use System.WCh_Con;
  36
  37 procedure Usage is
  38
  39    procedure Write_Switch_Char (Sw : String; Prefix : String := "gnat");
  40    --  Output two spaces followed by the switch character minus followed
  41    --  Prefix, followed by the string given as the argument, and then enough
  42    --  blanks to tab to column 13, i.e. assuming Sw is not longer than 5
  43    --  characters, the maximum allowed, Write_Switch_Char will always output
  44    --  exactly 12 characters.
  45
  46    -----------------------
  47    -- Write_Switch_Char --
  48    -----------------------
  49
  50    procedure Write_Switch_Char (Sw : String; Prefix : String := "gnat") is
  51    begin
  52       Write_Str ("  -");
  53       Write_Str (Prefix);
  54       Write_Str (Sw);
  55
  56       for J in 1 .. 12 - 3 - Prefix'Length - Sw'Length loop
  57          Write_Char (' ');
  58       end loop;
  59    end Write_Switch_Char;
  60
  61 --  Start of processing for Usage
  62
  63 begin
  64    Find_Program_Name;
  65
  66    --  For gnatmake, we are appending this information to the end of
  67    --  the normal gnatmake output, so generate appropriate header
  68
  69    if Name_Len >= 8
  70      and then (Name_Buffer (Name_Len - 7 .. Name_Len) = "gnatmake"
  71                  or else
  72                Name_Buffer (Name_Len - 7 .. Name_Len) = "GNATMAKE")
  73    then
  74       Write_Eol;
  75       Write_Line ("Compiler switches (passed to the compiler by gnatmake):");
  76
  77    else
  78       --  Usage line
  79
  80       Write_Str ("Usage: ");
  81       Write_Program_Name;
  82       Write_Char (' ');
  83       Write_Str ("switches sfile");
  84       Write_Eol;
  85       Write_Eol;
  86
  87       --  Line for sfile
  88
  89       Write_Line ("  sfile     Source file name");
  90    end if;
  91
  92    Write_Eol;
  93
  94    --  Common GCC switches not available for JVM, .NET, and AAMP targets
  95
  96    if VM_Target = No_VM and then not AAMP_On_Target then
  97       Write_Switch_Char ("fstack-check ", "");
  98       Write_Line ("Generate stack checking code");
  99
 100       Write_Switch_Char ("fno-inline   ", "");
 101       Write_Line ("Inhibit all inlining (makes executable smaller)");
 102
 103       Write_Switch_Char ("fpreserve-control-flow ", "");
 104       Write_Line ("Preserve control flow for coverage analysis");
 105    end if;
 106
 107    --  Common switches available to both GCC and JGNAT
 108
 109    Write_Switch_Char ("g            ", "");
 110    Write_Line ("Generate debugging information");
 111
 112    Write_Switch_Char ("Idir         ", "");
 113    Write_Line ("Specify source files search path");
 114
 115    Write_Switch_Char ("I-           ", "");
 116    Write_Line ("Do not look for sources in current directory");
 117
 118    Write_Switch_Char ("O[0123]      ", "");
 119    Write_Line ("Control the optimization level");
 120
 121    Write_Eol;
 122
 123    --  Individual lines for switches. Write_Switch_Char outputs fourteen
 124    --  characters, so the remaining message is allowed to be a maximum of
 125    --  65 characters to be comfortable in an 80 character window.
 126
 127    --  Line for -gnata switch
 128
 129    Write_Switch_Char ("a");
 130    Write_Line ("Assertions enabled. Pragma Assert/Debug to be activated");
 131
 132    --  Line for -gnatA switch
 133
 134    Write_Switch_Char ("A");
 135    Write_Line ("Avoid processing gnat.adc, if present file will be ignored");
 136
 137    --  Line for -gnatb switch
 138
 139    Write_Switch_Char ("b");
 140    Write_Line ("Generate brief messages to stderr even if verbose mode set");
 141
 142    --  Line for -gnatB switch
 143
 144    Write_Switch_Char ("B");
 145    Write_Line ("Assume no bad (invalid) values except in 'Valid attribute");
 146
 147    --  Line for -gnatc switch
 148
 149    Write_Switch_Char ("c");
 150    Write_Line ("Check syntax and semantics only (no code generation)");
 151
 152    --  Line for -gnatC switch
 153
 154    Write_Switch_Char ("C");
 155    Write_Line ("Generate CodePeer intermediate format (no code generation)");
 156
 157    --  Line for -gnatd switch
 158
 159    Write_Switch_Char ("d?");
 160    Write_Line ("Compiler debug option ? ([.]a-z,A-Z,0-9), see debug.adb");
 161
 162    --  Line for -gnatD switch
 163
 164    Write_Switch_Char ("D");
 165    Write_Line ("Debug expanded generated code (max line length = 72)");
 166    Write_Switch_Char ("Dnn");
 167    Write_Line ("Debug expanded generated code (max line length = nn)");
 168
 169    --  No line for -gnatea : internal switch
 170
 171    --  Line for -gnateA switch
 172
 173    Write_Switch_Char ("eA");
 174    Write_Line ("Aliasing checks on subprogram parameters");
 175
 176    --  Line for -gnatec switch
 177
 178    Write_Switch_Char ("ec=?");
 179    Write_Line ("Specify configuration pragmas file, e.g. -gnatec=/x/f.adc");
 180
 181    --  Line for -gnateC switch
 182
 183    Write_Switch_Char ("eC");
 184    Write_Line ("Generate CodePeer messages (ignored without -gnatcC)");
 185
 186    --  Line for -gnated switch
 187
 188    Write_Switch_Char ("ed");
 189    Write_Line ("Disable synchronization of atomic variables");
 190
 191    --  Line for -gnateD switch
 192
 193    Write_Switch_Char ("eD?");
 194    Write_Line ("Define or redefine preprocessing symbol, e.g. -gnateDsym=val");
 195
 196    --  Line for -gnateE switch
 197
 198    Write_Switch_Char ("eE");
 199    Write_Line ("Generate extra information in exception messages");
 200
 201    --  Line for -gnatef switch
 202
 203    Write_Switch_Char ("ef");
 204    Write_Line ("Full source path in brief error messages");
 205
 206    --  Line for -gnateF switch
 207
 208    Write_Switch_Char ("eF");
 209    Write_Line ("Check overflow on predefined Float types");
 210
 211    --  Line for -gnateG switch
 212
 213    Write_Switch_Char ("eG");
 214    Write_Line ("Generate preprocessed source");
 215
 216    --  Line for -gnatei switch
 217
 218    Write_Switch_Char ("einn");
 219    Write_Line ("Set maximum number of instantiations to nn");
 220
 221    --  Line for -gnateI switch
 222
 223    Write_Switch_Char ("eInn");
 224    Write_Line ("Index in multi-unit source, e.g. -gnateI2");
 225
 226    --  Line for -gnatel switch
 227
 228    Write_Switch_Char ("el");
 229    Write_Line ("Turn on info messages on generated Elaborate[_All] pragmas");
 230
 231    --  Line for -gnateL switch
 232
 233    Write_Switch_Char ("eL");
 234    Write_Line ("Turn off info messages on generated Elaborate[_All] pragmas");
 235
 236    --  Line for -gnatem switch
 237
 238    Write_Switch_Char ("em=?");
 239    Write_Line ("Specify mapping file, e.g. -gnatem=mapping");
 240
 241    --  No line for -gnateO=? : internal switch
 242
 243    --  Line for -gnatep switch
 244
 245    Write_Switch_Char ("ep=?");
 246    Write_Line ("Specify preprocessing data file, e.g. -gnatep=prep.data");
 247
 248    --  Line for -gnateP switch
 249
 250    Write_Switch_Char ("eP");
 251    Write_Line ("Pure/Prelaborate errors generate warnings rather than errors");
 252
 253    --  No line for -gnates=? : internal switch
 254
 255    --  Line for -gnateS switch
 256
 257    Write_Switch_Char ("eS");
 258    Write_Line ("Generate SCO (Source Coverage Obligation) information");
 259
 260    --  Line for -gnatet switch
 261
 262    Write_Switch_Char ("et=?");
 263    Write_Line ("Write target dependent information file ?, e.g. gnatet=tdf");
 264
 265    --  Line for -gnateT switch
 266
 267    Write_Switch_Char ("eT=?");
 268    Write_Line ("Read target dependent information file ?, e.g. gnateT=tdf");
 269
 270    --  Line for -gnateu switch
 271
 272    Write_Switch_Char ("eu");
 273    Write_Line ("Ignore unrecognized style/validity/warning switches");
 274
 275    --  Line for -gnateV switch
 276
 277    Write_Switch_Char ("eV");
 278    Write_Line ("Validity checks on subprogram parameters");
 279
 280    --  Line for -gnateY switch
 281
 282    Write_Switch_Char ("eY");
 283    Write_Line ("Ignore all Style_Checks pragmas in source");
 284
 285    --  No line for -gnatez : internal switch
 286
 287    --  Line for -gnatE switch
 288
 289    Write_Switch_Char ("E");
 290    Write_Line ("Dynamic elaboration checking mode enabled");
 291
 292    --  Line for -gnatf switch
 293
 294    Write_Switch_Char ("f");
 295    Write_Line ("Full errors. Verbose details, all undefined references");
 296
 297    --  Line for -gnatF switch
 298
 299    Write_Switch_Char ("F");
 300    Write_Line ("Force all import/export external names to all uppercase");
 301
 302    --  Line for -gnatg switch
 303
 304    Write_Switch_Char ("g");
 305    Write_Line ("GNAT implementation mode (used for compiling GNAT units)");
 306
 307    --  Lines for -gnatG switch
 308
 309    Write_Switch_Char ("G");
 310    Write_Line ("Output generated expanded code (max line length = 72)");
 311    Write_Switch_Char ("Gnn");
 312    Write_Line ("Output generated expanded code (max line length = nn)");
 313
 314    --  Line for -gnath switch
 315
 316    Write_Switch_Char ("h");
 317    Write_Line ("Output this usage (help) information");
 318
 319    --  Line for -gnati switch
 320
 321    Write_Switch_Char ("i?");
 322    Write_Line ("Identifier char set (?=1/2/3/4/5/8/9/p/f/n/w)");
 323
 324    --  Line for -gnatI switch
 325
 326    Write_Switch_Char ("I");
 327    Write_Line ("Ignore all representation clauses");
 328
 329    --  Line for -gnatj switch
 330
 331    Write_Switch_Char ("jnn");
 332    Write_Line ("Format error and warning messages to fit nn character lines");
 333
 334    --  Line for -gnatk switch
 335
 336    Write_Switch_Char ("k");
 337    Write_Line ("Limit file names to nn characters (k = krunch)");
 338
 339    --  Lines for -gnatl switch
 340
 341    Write_Switch_Char ("l");
 342    Write_Line ("Output full source listing with embedded error messages");
 343    Write_Switch_Char ("l=f");
 344    Write_Line ("Output full source listing to specified file");
 345
 346    --  Line for -gnatL switch
 347
 348    Write_Switch_Char ("L");
 349    Write_Line ("List corresponding source text in -gnatG or -gnatD output");
 350
 351    --  Line for -gnatm switch
 352
 353    Write_Switch_Char ("mnn");
 354    Write_Line ("Limit number of detected errors/warnings to nn (1-999999)");
 355
 356    --  Line for -gnatn switch
 357
 358    Write_Switch_Char ("n[?]");
 359    Write_Line ("Enable pragma Inline (both within and across units, ?=1/2)");
 360
 361    --  Line for -gnato switch
 362
 363    Write_Switch_Char ("o");
 364    Write_Line ("Enable overflow checking mode to CHECKED (off by default)");
 365
 366    --  Lines for -gnato? switches
 367
 368    Write_Switch_Char ("o?");
 369    Write_Line
 370      ("Enable overflow checks in STRICT/MINIMIZED/ELIMINATED (1/2/3) mode ");
 371    Write_Switch_Char ("o??");
 372    Write_Line
 373      ("Set mode for general/assertion expressions separately");
 374
 375    --  No line for -gnatO : internal switch
 376
 377    --  Line for -gnatp switch
 378
 379    Write_Switch_Char ("p");
 380    Write_Line ("Suppress all checks");
 381
 382    --  Line for -gnatP switch
 383
 384    Write_Switch_Char ("P");
 385    Write_Line ("Generate periodic calls to System.Polling.Poll");
 386
 387    --  Line for -gnatq switch
 388
 389    Write_Switch_Char ("q");
 390    Write_Line ("Don't quit, try semantics, even if parse errors");
 391
 392    --  Line for -gnatQ switch
 393
 394    Write_Switch_Char ("Q");
 395    Write_Line ("Don't quit, write ali/tree file even if compile errors");
 396
 397    --  Line for -gnatr switch
 398
 399    Write_Switch_Char ("r");
 400    Write_Line ("Treat pragma Restrictions as Restriction_Warnings");
 401
 402    --  Lines for -gnatR switch
 403
 404    Write_Switch_Char ("R?");
 405    Write_Line
 406      ("List rep info (?=0/1/2/3/m for none/types/all/variable/mechanisms)");
 407    Write_Switch_Char ("R?s");
 408    Write_Line ("List rep info to file.rep instead of standard output");
 409
 410    --  Line for -gnats switch
 411
 412    Write_Switch_Char ("s");
 413    Write_Line ("Syntax check only");
 414
 415    --  Line for -gnatS switch
 416
 417    Write_Switch_Char ("S");
 418    Write_Line ("Print listing of package Standard");
 419
 420    --  Line for -gnatt switch
 421
 422    Write_Switch_Char ("t");
 423    Write_Line ("Tree output file to be generated");
 424
 425    --  Line for -gnatTnn switch
 426
 427    Write_Switch_Char ("Tnn");
 428    Write_Line ("All compiler tables start at nn times usual starting size");
 429
 430    --  Line for -gnatu switch
 431
 432    Write_Switch_Char ("u");
 433    Write_Line ("List units for this compilation");
 434
 435    --  Line for -gnatU switch
 436
 437    Write_Switch_Char ("U");
 438    Write_Line ("Enable unique tag for error messages");
 439
 440    --  Line for -gnatv switch
 441
 442    Write_Switch_Char ("v");
 443    Write_Line ("Verbose mode. Full error output with source lines to stdout");
 444
 445    --  Lines for -gnatV switch
 446
 447    Write_Switch_Char ("Vxx");
 448    Write_Line
 449      ("Enable selected validity checking mode, xx = list of parameters:");
 450    Write_Line ("        a    turn on all validity checking options");
 451    Write_Line ("        c    turn on checking for copies");
 452    Write_Line ("        C    turn off checking for copies");
 453    Write_Line ("        d    turn on default (RM) checking");
 454    Write_Line ("        D    turn off default (RM) checking");
 455    Write_Line ("        e    turn on checking for elementary components");
 456    Write_Line ("        E    turn off checking for elementary components");
 457    Write_Line ("        f    turn on checking for floating-point");
 458    Write_Line ("        F    turn off checking for floating-point");
 459    Write_Line ("        i    turn on checking for in params");
 460    Write_Line ("        I    turn off checking for in params");
 461    Write_Line ("        m    turn on checking for in out params");
 462    Write_Line ("        M    turn off checking for in out params");
 463    Write_Line ("        o    turn on checking for operators/attributes");
 464    Write_Line ("        O    turn off checking for operators/attributes");
 465    Write_Line ("        p    turn on checking for parameters");
 466    Write_Line ("        P    turn off checking for parameters");
 467    Write_Line ("        r    turn on checking for returns");
 468    Write_Line ("        R    turn off checking for returns");
 469    Write_Line ("        s    turn on checking for subscripts");
 470    Write_Line ("        S    turn off checking for subscripts");
 471    Write_Line ("        t    turn on checking for tests");
 472    Write_Line ("        T    turn off checking for tests");
 473    Write_Line ("        n    turn off all validity checks (including RM)");
 474
 475    --  Lines for -gnatw switch
 476
 477    Write_Switch_Char ("wxx");
 478    Write_Line ("Enable selected warning modes, xx = list of parameters:");
 479    Write_Line ("        *    indicates default setting");
 480    Write_Line ("        +    indicates warning flag included in -gnatwa");
 481    Write_Line ("        a    turn on all info/warnings marked below with +");
 482    Write_Line ("        A    turn off all optional info/warnings");
 483    Write_Line ("        .a*+ turn on warnings for failing assertion");
 484    Write_Line ("        .A   turn off warnings for failing assertion");
 485    Write_Line ("        b+   turn on warnings for bad fixed value " &
 486                                                   "(not multiple of small)");
 487    Write_Line ("        B*   turn off warnings for bad fixed value " &
 488                                                   "(not multiple of small)");
 489    Write_Line ("        .b*+ turn on warnings for biased representation");
 490    Write_Line ("        .B   turn off warnings for biased representation");
 491    Write_Line ("        c+   turn on warnings for constant conditional");
 492    Write_Line ("        C*   turn off warnings for constant conditional");
 493    Write_Line ("        .c+  turn on warnings for unrepped components");
 494    Write_Line ("        .C*  turn off warnings for unrepped components");
 495    Write_Line ("        d    turn on warnings for implicit dereference");
 496    Write_Line ("        D*   turn off warnings for implicit dereference");
 497    Write_Line ("        .d   turn on tagging of warnings with -gnatw switch");
 498    Write_Line ("        .D*  turn off tagging of warnings with -gnatw switch");
 499    Write_Line ("        e    treat all warnings (but not info) as errors");
 500    Write_Line ("        .e   turn on every optional info/warning " &
 501                                                   "(no exceptions)");
 502    Write_Line ("        f+   turn on warnings for unreferenced formal");
 503    Write_Line ("        F*   turn off warnings for unreferenced formal");
 504    Write_Line ("        .f   turn on warnings for suspicious Subp'Access");
 505    Write_Line ("        .F*  turn off warnings for suspicious Subp'Access");
 506    Write_Line ("        g*+  turn on warnings for unrecognized pragma");
 507    Write_Line ("        G    turn off warnings for unrecognized pragma");
 508    Write_Line ("        .g   turn on GNAT warnings");
 509    Write_Line ("        h    turn on warnings for hiding declarations");
 510    Write_Line ("        H*   turn off warnings for hiding declarations");
 511    Write_Line ("        .h   turn on warnings for holes in records");
 512    Write_Line ("        .H*  turn off warnings for holes in records");
 513    Write_Line ("        i*+  turn on warnings for implementation unit");
 514    Write_Line ("        I    turn off warnings for implementation unit");
 515    Write_Line ("        .i*+ turn on warnings for overlapping actuals");
 516    Write_Line ("        .I   turn off warnings for overlapping actuals");
 517    Write_Line ("        j+   turn on warnings for obsolescent " &
 518                                                   "(annex J) feature");
 519    Write_Line ("        J*   turn off warnings for obsolescent " &
 520                                                   "(annex J) feature");
 521    Write_Line ("        k+   turn on warnings on constant variable");
 522    Write_Line ("        K*   turn off warnings on constant variable");
 523    Write_Line ("        .k   turn on warnings for standard redefinition");
 524    Write_Line ("        .K*  turn off warnings for standard redefinition");
 525    Write_Line ("        l    turn on warnings for elaboration problems");
 526    Write_Line ("        L*   turn off warnings for elaboration problems");
 527    Write_Line ("        .l   turn on info messages for inherited aspects");
 528    Write_Line ("        .L*  turn off info messages for inherited aspects");
 529    Write_Line ("        m+   turn on warnings for variable assigned " &
 530                                                   "but not read");
 531    Write_Line ("        M*   turn off warnings for variable assigned " &
 532                                                   "but not read");
 533    Write_Line ("        .m*+ turn on warnings for suspicious modulus value");
 534    Write_Line ("        .M   turn off warnings for suspicious modulus value");
 535    Write_Line ("        n*   normal warning mode (cancels -gnatws/-gnatwe)");
 536    Write_Line ("        .n   turn on info messages for atomic " &
 537                                                   "synchronization");
 538    Write_Line ("        .N*  turn off info messages for atomic " &
 539                                                   "synchronization");
 540    Write_Line ("        o*   turn on warnings for address clause overlay");
 541    Write_Line ("        O    turn off warnings for address clause overlay");
 542    Write_Line ("        .o   turn on warnings for out parameters assigned " &
 543                                                   "but not read");
 544    Write_Line ("        .O*  turn off warnings for out parameters assigned " &
 545                                                   "but not read");
 546    Write_Line ("        p+   turn on warnings for ineffective pragma " &
 547                                                   "Inline in frontend");
 548    Write_Line ("        P*   turn off warnings for ineffective pragma " &
 549                                                   "Inline in frontend");
 550    Write_Line ("        .p+  turn on warnings for suspicious parameter " &
 551                                                   "order");
 552    Write_Line ("        .P*  turn off warnings for suspicious parameter " &
 553                                                   "order");
 554    Write_Line ("        q*+  turn on warnings for questionable " &
 555                                                   "missing parenthesis");
 556    Write_Line ("        Q    turn off warnings for questionable " &
 557                                                   "missing parenthesis");
 558    Write_Line ("        r+   turn on warnings for redundant construct");
 559    Write_Line ("        R*   turn off warnings for redundant construct");
 560    Write_Line ("        .r+  turn on warnings for object renaming function");
 561    Write_Line ("        .R*  turn off warnings for object renaming function");
 562    Write_Line ("        s    suppress all info/warnings");
 563    Write_Line ("        .s   turn on warnings for overridden size clause");
 564    Write_Line ("        .S*  turn off warnings for overridden size clause");
 565    Write_Line ("        t    turn on warnings for tracking deleted code");
 566    Write_Line ("        T*   turn off warnings for tracking deleted code");
 567    Write_Line ("        .t*+ turn on warnings for suspicious contract");
 568    Write_Line ("        .T   turn off warnings for suspicious contract");
 569    Write_Line ("        u+   turn on warnings for unused entity");
 570    Write_Line ("        U*   turn off warnings for unused entity");
 571    Write_Line ("        .u   turn on warnings for unordered enumeration");
 572    Write_Line ("        .U*  turn off warnings for unordered enumeration");
 573    Write_Line ("        v*+  turn on warnings for unassigned variable");
 574    Write_Line ("        V    turn off warnings for unassigned variable");
 575    Write_Line ("        .v*+ turn on info messages for reverse bit order");
 576    Write_Line ("        .V   turn off info messages for reverse bit order");
 577    Write_Line ("        w*+  turn on warnings for wrong low bound assumption");
 578    Write_Line ("        W    turn off warnings for wrong low bound " &
 579                                                   "assumption");
 580    Write_Line ("        .w   turn on warnings on pragma Warnings Off");
 581    Write_Line ("        .W*  turn off warnings on pragma Warnings Off");
 582    Write_Line ("        x*+  turn on warnings for export/import");
 583    Write_Line ("        X    turn off warnings for export/import");
 584    Write_Line ("        .x+  turn on warnings for non-local exception");
 585    Write_Line ("        .X*  turn off warnings for non-local exception");
 586    Write_Line ("        y*+  turn on warnings for Ada compatibility issues");
 587    Write_Line ("        Y    turn off warnings for Ada compatibility issues");
 588    Write_Line ("        .y   turn on info messages for why pkg body needed");
 589    Write_Line ("        .Y*  turn off info messages for why pkg body needed");
 590    Write_Line ("        z*+  turn on warnings for suspicious " &
 591                                                   "unchecked conversion");
 592    Write_Line ("        Z    turn off warnings for suspicious " &
 593                                                   "unchecked conversion");
 594    Write_Line ("        .z*+ turn on warnings for record size not a " &
 595                                                   "multiple of alignment");
 596    Write_Line ("        .Z   turn off warnings for record size not a " &
 597                                                   "multiple of alignment");
 598
 599    --  Line for -gnatW switch
 600
 601    Write_Switch_Char ("W?");
 602    Write_Str ("Wide character encoding method (?=");
 603
 604    for J in WC_Encoding_Method loop
 605       Write_Char (WC_Encoding_Letters (J));
 606
 607       if J = WC_Encoding_Method'Last then
 608          Write_Char (')');
 609       else
 610          Write_Char ('/');
 611       end if;
 612    end loop;
 613
 614    Write_Eol;
 615
 616    --  Line for -gnatx switch
 617
 618    Write_Switch_Char ("x");
 619    Write_Line ("Suppress output of cross-reference information");
 620
 621    --  Line for -gnatX switch
 622
 623    Write_Switch_Char ("X");
 624    Write_Line ("Language extensions permitted");
 625
 626    --  Lines for -gnaty switch
 627
 628    Write_Switch_Char ("y");
 629    Write_Line ("Enable default style checks (same as -gnaty3abcefhiklmnprst)");
 630    Write_Switch_Char ("yxx");
 631    Write_Line ("Enable selected style checks xx = list of parameters:");
 632    Write_Line ("        1-9  check indentation");
 633    Write_Line ("        a    check attribute casing");
 634    Write_Line ("        A    check array attribute indexes");
 635    Write_Line ("        b    check no blanks at end of lines");
 636    Write_Line ("        B    check no use of AND/OR for boolean expressions");
 637    Write_Line ("        c    check comment format (two spaces)");
 638    Write_Line ("        C    check comment format (one space)");
 639    Write_Line ("        d    check no DOS line terminators");
 640    Write_Line ("        e    check end/exit labels present");
 641    Write_Line ("        f    check no form feeds/vertical tabs in source");
 642    Write_Line ("        g    check standard GNAT style rules, same as ydISux");
 643    Write_Line ("        h    check no horizontal tabs in source");
 644    Write_Line ("        i    check if-then layout");
 645    Write_Line ("        I    check mode in");
 646    Write_Line ("        k    check casing rules for keywords");
 647    Write_Line ("        l    check reference manual layout");
 648    Write_Line ("        Lnn  check max nest level < nn ");
 649    Write_Line ("        m    check line length <= 79 characters");
 650    Write_Line ("        Mnn  check line length <= nn characters");
 651    Write_Line ("        n    check casing of package Standard identifiers");
 652    Write_Line ("        N    turn off all checks");
 653    Write_Line ("        o    check subprogram bodies in alphabetical order");
 654    Write_Line ("        O    check overriding indicators");
 655    Write_Line ("        p    check pragma casing");
 656    Write_Line ("        r    check casing for identifier references");
 657    Write_Line ("        s    check separate subprogram specs present");
 658    Write_Line ("        S    check separate lines after THEN or ELSE");
 659    Write_Line ("        t    check token separation rules");
 660    Write_Line ("        u    check no unnecessary blank lines");
 661    Write_Line ("        x    check extra parentheses around conditionals");
 662    Write_Line ("        y    turn on default style checks");
 663    Write_Line ("        -    subtract (turn off) subsequent checks");
 664    Write_Line ("        +    add (turn on) subsequent checks");
 665
 666    --  Lines for -gnatyN switch
 667
 668    Write_Switch_Char ("yN");
 669    Write_Line ("Cancel all previously set style checks");
 670
 671    --  Lines for -gnatzc switch
 672
 673    Write_Switch_Char ("zc");
 674    Write_Line ("Distribution stub generation for caller stubs");
 675
 676    --  Lines for -gnatzr switch
 677
 678    Write_Switch_Char ("zr");
 679    Write_Line ("Distribution stub generation for receiver stubs");
 680
 681    --  Line for -gnat83 switch
 682
 683    Write_Switch_Char ("83");
 684    Write_Line ("Ada 83 mode");
 685
 686    --  Line for -gnat95 switch
 687
 688    Write_Switch_Char ("95");
 689
 690    if Ada_Version_Default = Ada_95 then
 691       Write_Line ("Ada 95 mode (default)");
 692    else
 693       Write_Line ("Ada 95 mode");
 694    end if;
 695
 696    --  Line for -gnat2005 switch
 697
 698    Write_Switch_Char ("2005");
 699
 700    if Ada_Version_Default = Ada_2005 then
 701       Write_Line ("Ada 2005 mode (default)");
 702    else
 703       Write_Line ("Ada 2005 mode");
 704    end if;
 705
 706    --  Line for -gnat2012 switch
 707
 708    Write_Switch_Char ("2012");
 709
 710    if Ada_Version_Default = Ada_2012 then
 711       Write_Line ("Ada 2012 mode (default)");
 712    else
 713       Write_Line ("Ada 2012 mode");
 714    end if;
 715
 716    --  Line for -gnat-p switch
 717
 718    Write_Switch_Char ("-p");
 719    Write_Line ("Cancel effect of previous -gnatp switch");
 720
 721 end Usage;