gcc/opts.c

   1 /* Command line option handling.
   2    Copyright (C) 2002, 2003 Free Software Foundation, Inc.
   3    Contributed by Neil Booth.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "tree.h"
  27 #include "rtl.h"
  28 #include "ggc.h"
  29 #include "output.h"
  30 #include "langhooks.h"
  31 #include "opts.h"
  32 #include "options.h"
  33 #include "flags.h"
  34 #include "toplev.h"
  35 #include "params.h"
  36 #include "diagnostic.h"
  37
  38 /* Value of the -G xx switch, and whether it was passed or not.  */
  39 unsigned HOST_WIDE_INT g_switch_value;
  40 bool g_switch_set;
  41
  42 /* True if we should exit after parsing options.  */
  43 bool exit_after_options;
  44
  45 /* If -version.  */
  46 bool version_flag;
  47
  48 /* Print various extra warnings.  -W/-Wextra.  */
  49 bool extra_warnings;
  50
  51 /* Don't print warning messages.  -w.  */
  52 bool inhibit_warnings;
  53
  54 /* Treat warnings as errors.  -Werror.  */
  55 bool warnings_are_errors;
  56
  57 /* Warn if a function returns an aggregate, since there are often
  58    incompatible calling conventions for doing this.  */
  59 bool warn_aggregate_return;
  60
  61 /* Nonzero means warn about pointer casts that increase the required
  62    alignment of the target type (and might therefore lead to a crash
  63    due to a misaligned access).  */
  64 bool warn_cast_align;
  65
  66 /* Nonzero means warn about uses of __attribute__((deprecated))
  67    declarations.  */
  68 bool warn_deprecated_decl = true;
  69
  70 /* Warn when an optimization pass is disabled.  */
  71 bool warn_disabled_optimization;
  72
  73 /* Nonzero means warn if inline function is too large.  */
  74 bool warn_inline;
  75
  76 /* True to warn about any objects definitions whose size is larger
  77    than N bytes.  Also want about function definitions whose returned
  78    values are larger than N bytes, where N is `larger_than_size'.  */
  79 bool warn_larger_than;
  80 HOST_WIDE_INT larger_than_size;
  81
  82 /* Warn about functions which might be candidates for attribute noreturn.  */
  83 bool warn_missing_noreturn;
  84
  85 /* True to warn about code which is never reached.  */
  86 bool warn_notreached;
  87
  88 /* Warn if packed attribute on struct is unnecessary and inefficient.  */
  89 bool warn_packed;
  90
  91 /* Warn when gcc pads a structure to an alignment boundary.  */
  92 bool warn_padded;
  93
  94 /* True means warn about all declarations which shadow others.  */
  95 bool warn_shadow;
  96
  97 /* Nonzero means warn about constructs which might not be
  98    strict-aliasing safe.  */
  99 bool warn_strict_aliasing;
 100
 101 /* True to warn if a switch on an enum, that does not have a default
 102    case, fails to have a case for every enum value.  */
 103 bool warn_switch;
 104
 105 /* Warn if a switch does not have a default case.  */
 106 bool warn_switch_default;
 107
 108 /* Warn if a switch on an enum fails to have a case for every enum
 109    value (regardless of the presence or otherwise of a default case).  */
 110 bool warn_switch_enum;
 111
 112 /* Don't suppress warnings from system headers.  -Wsystem-headers.  */
 113 bool warn_system_headers;
 114
 115 /* True to warn about variables used before they are initialized.  */
 116 int warn_uninitialized;
 117
 118 /* True to warn about unused variables, functions et.al.  */
 119 bool warn_unused_function;
 120 bool warn_unused_label;
 121 bool warn_unused_parameter;
 122 bool warn_unused_variable;
 123 bool warn_unused_value;
 124
 125 /* Hack for cooperation between set_Wunused and set_Wextra.  */
 126 static bool maybe_warn_unused_parameter;
 127
 128 static size_t find_opt (const char *, int);
 129 static int common_handle_option (size_t scode, const char *arg, int value);
 130 static void handle_param (const char *);
 131 static void set_Wextra (int);
 132
 133 /* Perform a binary search to find which option the command-line INPUT
 134    matches.  Returns its index in the option array, and N_OPTS
 135    (cl_options_count) on failure.
 136
 137    This routine is quite subtle.  A normal binary search is not good
 138    enough because some options can be suffixed with an argument, and
 139    multiple sub-matches can occur, e.g. input of "-pedantic" matching
 140    the initial substring of "-pedantic-errors".
 141
 142    A more complicated example is -gstabs.  It should match "-g" with
 143    an argument of "stabs".  Suppose, however, that the number and list
 144    of switches are such that the binary search tests "-gen-decls"
 145    before having tested "-g".  This doesn't match, and as "-gen-decls"
 146    is less than "-gstabs", it will become the lower bound of the
 147    binary search range, and "-g" will never be seen.  To resolve this
 148    issue, opts.sh makes "-gen-decls" point, via the back_chain member,
 149    to "-g" so that failed searches that end between "-gen-decls" and
 150    the lexicographically subsequent switch know to go back and see if
 151    "-g" causes a match (which it does in this example).
 152
 153    This search is done in such a way that the longest match for the
 154    front end in question wins.  If there is no match for the current
 155    front end, the longest match for a different front end is returned
 156    (or N_OPTS if none) and the caller emits an error message.  */
 157 static size_t
 158 find_opt (const char *input, int lang_mask)
 159 {
 160   size_t mn, mx, md, opt_len;
 161   size_t match_wrong_lang;
 162   int comp;
 163
 164   mn = 0;
 165   mx = cl_options_count;
 166
 167   /* Find mn such this lexicographical inequality holds:
 168      cl_options[mn] <= input < cl_options[mn + 1].  */
 169   while (mx - mn > 1)
 170     {
 171       md = (mn + mx) / 2;
 172       opt_len = cl_options[md].opt_len;
 173       comp = strncmp (input, cl_options[md].opt_text, opt_len);
 174
 175       if (comp < 0)
 176         mx = md;
 177       else
 178         mn = md;
 179     }
 180
 181   /* This is the switch that is the best match but for a different
 182      front end, or cl_options_count if there is no match at all.  */
 183   match_wrong_lang = cl_options_count;
 184
 185   /* Backtrace the chain of possible matches, returning the longest
 186      one, if any, that fits best.  With current GCC switches, this
 187      loop executes at most twice.  */
 188   do
 189     {
 190       const struct cl_option *opt = &cl_options[mn];
 191
 192       /* Is this switch a prefix of the input?  */
 193       if (!strncmp (input, opt->opt_text, opt->opt_len))
 194         {
 195           /* If language is OK, and the match is exact or the switch
 196              takes a joined argument, return it.  */
 197           if ((opt->flags & lang_mask)
 198               && (input[opt->opt_len] == '\0' || (opt->flags & CL_JOINED)))
 199             return mn;
 200
 201           /* If we haven't remembered a prior match, remember this
 202              one.  Any prior match is necessarily better.  */
 203           if (match_wrong_lang != cl_options_count)
 204             match_wrong_lang = mn;
 205         }
 206
 207       /* Try the next possibility.  This is cl_options_count if there
 208          are no more.  */
 209       mn = opt->back_chain;
 210     }
 211   while (mn != cl_options_count);
 212
 213   /* Return the best wrong match, or cl_options_count if none.  */
 214   return match_wrong_lang;
 215 }
 216
 217 /* If ARG is a non-negative integer made up solely of digits, return its
 218    value, otherwise return -1.  */
 219 static int
 220 integral_argument (const char *arg)
 221 {
 222   const char *p = arg;
 223
 224   while (*p && ISDIGIT (*p))
 225     p++;
 226
 227   if (*p == '\0')
 228     return atoi (arg);
 229
 230   return -1;
 231 }
 232
 233 /* Handle the switch beginning at ARGV, with ARGC remaining.  */
 234 int
 235 handle_option (int argc ATTRIBUTE_UNUSED, char **argv, int lang_mask)
 236 {
 237   size_t opt_index;
 238   const char *opt, *arg = 0;
 239   char *dup = 0;
 240   int value = 1;
 241   int result = 0;
 242   const struct cl_option *option;
 243
 244   opt = argv[0];
 245
 246   /* Interpret "-" or a non-switch as a file name.  */
 247   if (opt[0] != '-' || opt[1] == '\0')
 248     {
 249       opt_index = cl_options_count;
 250       arg = opt;
 251       main_input_filename = opt;
 252       result = (*lang_hooks.handle_option) (opt_index, arg, value);
 253     }
 254   else
 255     {
 256       /* Drop the "no-" from negative switches.  */
 257       if ((opt[1] == 'W' || opt[1] == 'f')
 258           && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
 259         {
 260           size_t len = strlen (opt) - 3;
 261
 262           dup = xmalloc (len + 1);
 263           dup[0] = '-';
 264           dup[1] = opt[1];
 265           memcpy (dup + 2, opt + 5, len - 2 + 1);
 266           opt = dup;
 267           value = 0;
 268         }
 269
 270       opt_index = find_opt (opt + 1, lang_mask | CL_COMMON);
 271       if (opt_index == cl_options_count)
 272         goto done;
 273
 274       option = &cl_options[opt_index];
 275
 276       /* Reject negative form of switches that don't take negatives.  */
 277       if (!value && (option->flags & CL_REJECT_NEGATIVE))
 278         goto done;
 279
 280       /* We've recognized this switch.  */
 281       result = 1;
 282
 283       /* Sort out any argument the switch takes.  */
 284       if (option->flags & CL_JOINED)
 285         {
 286           /* Have arg point to the original switch.  This is because
 287              some code, such as disable_builtin_function, expects its
 288              argument to be persistent until the program exits.  */
 289           arg = argv[0] + cl_options[opt_index].opt_len + 1;
 290           if (!value)
 291             arg += strlen ("no-");
 292
 293           if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
 294             {
 295               if (option->flags & CL_SEPARATE)
 296                 {
 297                   arg = argv[1];
 298                   result = 2;
 299                 }
 300               else
 301                 /* Missing argument.  */
 302                 arg = NULL;
 303             }
 304         }
 305       else if (option->flags & CL_SEPARATE)
 306         {
 307           arg = argv[1];
 308           result = 2;
 309         }
 310
 311       /* If the switch takes an integer, convert it.  */
 312       if (arg && (option->flags & CL_UINTEGER))
 313         {
 314           value = integral_argument (arg);
 315           if (value == -1)
 316             {
 317               error ("argument to \"-%s\" should be a non-negative integer",
 318                      option->opt_text);
 319               goto done;
 320             }
 321         }
 322
 323       if (option->flags & lang_mask)
 324         if ((*lang_hooks.handle_option) (opt_index, arg, value) == 0)
 325           result = 0;
 326
 327       if (result && (option->flags & CL_COMMON))
 328         if (common_handle_option (opt_index, arg, value) == 0)
 329           result = 0;
 330     }
 331
 332  done:
 333   if (dup)
 334     free (dup);
 335   return result;
 336 }
 337
 338 /* Handle target- and language-independent options.  Return zero to
 339    generate an "unknown option" message.  */
 340 static int
 341 common_handle_option (size_t scode, const char *arg,
 342                       int value ATTRIBUTE_UNUSED)
 343 {
 344   const struct cl_option *option = &cl_options[scode];
 345   enum opt_code code = (enum opt_code) scode;
 346
 347   if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
 348     {
 349       error ("missing argument to \"-%s\"", option->opt_text);
 350       return 1;
 351     }
 352
 353   switch (code)
 354     {
 355     default:
 356       abort ();
 357
 358     case OPT__help:
 359       display_help ();
 360       exit_after_options = true;
 361       break;
 362
 363     case OPT__param:
 364       handle_param (arg);
 365       break;
 366
 367     case OPT__target_help:
 368       display_target_options ();
 369       exit_after_options = true;
 370       break;
 371
 372     case OPT__version:
 373       print_version (stderr, "");
 374       exit_after_options = true;
 375       break;
 376
 377     case OPT_G:
 378       g_switch_value = value;
 379       g_switch_set = true;
 380       break;
 381
 382     case OPT_O:
 383     case OPT_Os:
 384       /* Currently handled in a prescan.  */
 385       break;
 386
 387     case OPT_W:
 388       /* For backward compatibility, -W is the same as -Wextra.  */
 389       set_Wextra (value);
 390       break;
 391
 392     case OPT_Waggregate_return:
 393       warn_aggregate_return = value;
 394       break;
 395
 396     case OPT_Wcast_align:
 397       warn_cast_align = value;
 398       break;
 399
 400     case OPT_Wdeprecated_declarations:
 401       warn_deprecated_decl = value;
 402
 403     case OPT_Wdisabled_optimization:
 404       warn_disabled_optimization = value;
 405       break;
 406
 407     case OPT_Werror:
 408       warnings_are_errors = value;
 409       break;
 410
 411     case OPT_Wextra:
 412       set_Wextra (value);
 413       break;
 414
 415     case OPT_Winline:
 416       warn_inline = value;
 417       break;
 418
 419     case OPT_Wlarger_than_:
 420       larger_than_size = value;
 421       warn_larger_than = value != -1;
 422       break;
 423
 424     case OPT_Wmissing_noreturn:
 425       warn_missing_noreturn = value;
 426       break;
 427
 428     case OPT_Wpacked:
 429       warn_packed = value;
 430       break;
 431
 432     case OPT_Wpadded:
 433       warn_padded = value;
 434       break;
 435
 436     case OPT_Wshadow:
 437       warn_shadow = value;
 438       break;
 439
 440     case OPT_Wstrict_aliasing:
 441       warn_strict_aliasing = value;
 442       break;
 443
 444     case OPT_Wswitch:
 445       warn_switch = value;
 446       break;
 447
 448     case OPT_Wswitch_default:
 449       warn_switch_default = value;
 450       break;
 451
 452     case OPT_Wswitch_enum:
 453       warn_switch_enum = value;
 454       break;
 455
 456     case OPT_Wsystem_headers:
 457       warn_system_headers = value;
 458       break;
 459
 460     case OPT_Wuninitialized:
 461       warn_uninitialized = value;
 462       break;
 463
 464     case OPT_Wunreachable_code:
 465       warn_notreached = value;
 466       break;
 467
 468     case OPT_Wunused:
 469       set_Wunused (value);
 470       break;
 471
 472     case OPT_Wunused_function:
 473       warn_unused_function = value;
 474       break;
 475
 476     case OPT_Wunused_label:
 477       warn_unused_label = value;
 478       break;
 479
 480     case OPT_Wunused_parameter:
 481       warn_unused_parameter = value;
 482       break;
 483
 484     case OPT_Wunused_value:
 485       warn_unused_value = value;
 486       break;
 487
 488     case OPT_Wunused_variable:
 489       warn_unused_variable = value;
 490       break;
 491
 492     case OPT_aux_info:
 493     case OPT_aux_info_:
 494       aux_info_file_name = arg;
 495       flag_gen_aux_info = 1;
 496       break;
 497
 498     case OPT_auxbase:
 499       aux_base_name = arg;
 500       break;
 501
 502     case OPT_auxbase_strip:
 503       {
 504         char *tmp = xstrdup (arg);
 505         strip_off_ending (tmp, strlen (tmp));
 506         if (tmp[0])
 507           aux_base_name = tmp;
 508       }
 509       break;
 510
 511     case OPT_d:
 512       decode_d_option (arg);
 513       break;
 514
 515     case OPT_dumpbase:
 516       dump_base_name = arg;
 517       break;
 518
 519     case OPT_fPIC:
 520       flag_pic = value + value;
 521       break;
 522
 523     case OPT_fPIE:
 524       flag_pie = value + value;
 525       break;
 526
 527     case OPT_falign_functions:
 528     case OPT_falign_functions_:
 529       align_functions = value;
 530       break;
 531
 532     case OPT_falign_jumps:
 533     case OPT_falign_jumps_:
 534       align_jumps = value;
 535       break;
 536
 537     case OPT_falign_labels:
 538     case OPT_falign_labels_:
 539       align_labels = value;
 540       break;
 541
 542     case OPT_falign_loops:
 543     case OPT_falign_loops_:
 544       align_loops = value;
 545       break;
 546
 547     case OPT_fargument_alias:
 548       flag_argument_noalias = !value;
 549       break;
 550
 551     case OPT_fargument_noalias:
 552       flag_argument_noalias = value;
 553       break;
 554
 555     case OPT_fargument_noalias_global:
 556       flag_argument_noalias = value + value;
 557       break;
 558
 559     case OPT_fasynchronous_unwind_tables:
 560       flag_asynchronous_unwind_tables = value;
 561       break;
 562
 563     case OPT_fbounds_check:
 564       flag_bounds_check = value;
 565       break;
 566
 567     case OPT_fbranch_count_reg:
 568       flag_branch_on_count_reg = value;
 569       break;
 570
 571     case OPT_fbranch_probabilities:
 572       flag_branch_probabilities = value;
 573       break;
 574
 575     case OPT_fbranch_target_load_optimize:
 576       flag_branch_target_load_optimize = value;
 577       break;
 578
 579     case OPT_fbranch_target_load_optimize2:
 580       flag_branch_target_load_optimize2 = value;
 581       break;
 582
 583     case OPT_fcall_used_:
 584       fix_register (arg, 0, 1);
 585       break;
 586
 587     case OPT_fcall_saved_:
 588       fix_register (arg, 0, 0);
 589       break;
 590
 591     case OPT_fcaller_saves:
 592       flag_caller_saves = value;
 593       break;
 594
 595     case OPT_fcommon:
 596       flag_no_common = !value;
 597       break;
 598
 599     case OPT_fcprop_registers:
 600       flag_cprop_registers = value;
 601       break;
 602
 603     case OPT_fcrossjumping:
 604       flag_crossjumping = value;
 605       break;
 606
 607     case OPT_fcse_follow_jumps:
 608       flag_cse_follow_jumps = value;
 609       break;
 610
 611     case OPT_fcse_skip_blocks:
 612       flag_cse_skip_blocks = value;
 613       break;
 614
 615     case OPT_fdata_sections:
 616       flag_data_sections = value;
 617       break;
 618
 619     case OPT_fdefer_pop:
 620       flag_defer_pop = value;
 621       break;
 622
 623     case OPT_fdelayed_branch:
 624       flag_delayed_branch = value;
 625       break;
 626
 627     case OPT_fdelete_null_pointer_checks:
 628       flag_delete_null_pointer_checks = value;
 629       break;
 630
 631     case OPT_fdiagnostics_show_location_:
 632       if (!strcmp (arg, "once"))
 633         diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
 634       else if (!strcmp (arg, "every-line"))
 635         diagnostic_prefixing_rule (global_dc)
 636           = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
 637       else
 638         return 0;
 639       break;
 640
 641     case OPT_fdump_unnumbered:
 642       flag_dump_unnumbered = value;
 643       break;
 644
 645     case OPT_feliminate_dwarf2_dups:
 646       flag_eliminate_dwarf2_dups = value;
 647       break;
 648
 649     case OPT_feliminate_unused_debug_types:
 650       flag_eliminate_unused_debug_types = value;
 651       break;
 652
 653     case OPT_fexceptions:
 654       flag_exceptions = value;
 655       break;
 656
 657     case OPT_fexpensive_optimizations:
 658       flag_expensive_optimizations = value;
 659       break;
 660
 661     case OPT_ffast_math:
 662       set_fast_math_flags (value);
 663       break;
 664
 665     case OPT_ffinite_math_only:
 666       flag_finite_math_only = value;
 667       break;
 668
 669     case OPT_ffixed_:
 670       fix_register (arg, 1, 1);
 671       break;
 672
 673     case OPT_ffunction_cse:
 674       flag_no_function_cse = !value;
 675       break;
 676
 677     case OPT_ffloat_store:
 678       flag_float_store = value;
 679       break;
 680
 681     case OPT_fforce_addr:
 682       flag_force_addr = value;
 683       break;
 684
 685     case OPT_fforce_mem:
 686       flag_force_mem = value;
 687       break;
 688
 689     case OPT_ffunction_sections:
 690       flag_function_sections = value;
 691       break;
 692
 693     case OPT_fgcse:
 694       flag_gcse = value;
 695       break;
 696
 697     case OPT_fgcse_lm:
 698       flag_gcse_lm = value;
 699       break;
 700
 701     case OPT_fgcse_sm:
 702       flag_gcse_sm = value;
 703       break;
 704
 705     case OPT_fgnu_linker:
 706       flag_gnu_linker = value;
 707       break;
 708
 709     case OPT_fguess_branch_probability:
 710       flag_guess_branch_prob = value;
 711       break;
 712
 713     case OPT_fident:
 714       flag_no_ident = !value;
 715       break;
 716
 717     case OPT_fif_conversion:
 718       flag_if_conversion = value;
 719       break;
 720
 721     case OPT_fif_conversion2:
 722       flag_if_conversion2 = value;
 723       break;
 724
 725     case OPT_finhibit_size_directive:
 726       flag_inhibit_size_directive = value;
 727       break;
 728
 729     case OPT_finline:
 730       flag_no_inline = !value;
 731       break;
 732
 733     case OPT_finline_functions:
 734       flag_inline_functions = value;
 735       break;
 736
 737     case OPT_finline_limit_:
 738     case OPT_finline_limit_eq:
 739       set_param_value ("max-inline-insns", value);
 740       set_param_value ("max-inline-insns-single", value / 2);
 741       set_param_value ("max-inline-insns-auto", value / 2);
 742       set_param_value ("max-inline-insns-rtl", value);
 743       if (value / 4 < MIN_INLINE_INSNS)
 744         {
 745           if (value / 4 > 10)
 746             set_param_value ("min-inline-insns", value / 4);
 747           else
 748             set_param_value ("min-inline-insns", 10);
 749         }
 750       break;
 751
 752     case OPT_finstrument_functions:
 753       flag_instrument_function_entry_exit = value;
 754       break;
 755
 756     case OPT_fkeep_inline_functions:
 757       flag_keep_inline_functions =value;
 758       break;
 759
 760     case OPT_fkeep_static_consts:
 761       flag_keep_static_consts = value;
 762       break;
 763
 764     case OPT_fleading_underscore:
 765       flag_leading_underscore = value;
 766       break;
 767
 768     case OPT_floop_optimize:
 769       flag_loop_optimize = value;
 770       break;
 771
 772     case OPT_fmath_errno:
 773       flag_errno_math = value;
 774       break;
 775
 776     case OPT_fmem_report:
 777       mem_report = value;
 778       break;
 779
 780     case OPT_fmerge_all_constants:
 781       flag_merge_constants = value + value;
 782       break;
 783
 784     case OPT_fmerge_constants:
 785       flag_merge_constants = value;
 786       break;
 787
 788     case OPT_fmessage_length_:
 789       output_set_maximum_length (&global_dc->buffer, value);
 790       break;
 791
 792     case OPT_fmove_all_movables:
 793       flag_move_all_movables = value;
 794       break;
 795
 796     case OPT_fnew_ra:
 797       flag_new_regalloc = value;
 798       break;
 799
 800     case OPT_fnon_call_exceptions:
 801       flag_non_call_exceptions = value;
 802       break;
 803
 804     case OPT_fold_unroll_all_loops:
 805       flag_old_unroll_all_loops = value;
 806       break;
 807
 808     case OPT_fold_unroll_loops:
 809       flag_old_unroll_loops = value;
 810       break;
 811
 812     case OPT_fomit_frame_pointer:
 813       flag_omit_frame_pointer = value;
 814       break;
 815
 816     case OPT_foptimize_register_move:
 817       flag_regmove = value;
 818       break;
 819
 820     case OPT_foptimize_sibling_calls:
 821       flag_optimize_sibling_calls = value;
 822       break;
 823
 824     case OPT_fpack_struct:
 825       flag_pack_struct = value;
 826       break;
 827
 828     case OPT_fpeel_loops:
 829       flag_peel_loops = value;
 830       break;
 831
 832     case OPT_fpcc_struct_return:
 833       flag_pcc_struct_return = value;
 834       break;
 835
 836     case OPT_fpeephole:
 837       flag_no_peephole = !value;
 838       break;
 839
 840     case OPT_fpeephole2:
 841       flag_peephole2 = value;
 842       break;
 843
 844     case OPT_fpic:
 845       flag_pic = value;
 846       break;
 847
 848     case OPT_fpie:
 849       flag_pie = value;
 850       break;
 851
 852     case OPT_fprefetch_loop_arrays:
 853       flag_prefetch_loop_arrays = value;
 854       break;
 855
 856     case OPT_fprofile:
 857       profile_flag = value;
 858       break;
 859
 860     case OPT_fprofile_arcs:
 861       profile_arc_flag = value;
 862       break;
 863
 864     case OPT_frandom_seed:
 865       /* The real switch is -fno-random-seed.  */
 866       if (value)
 867         return 0;
 868       flag_random_seed = NULL;
 869       break;
 870
 871     case OPT_frandom_seed_:
 872       flag_random_seed = arg;
 873       break;
 874
 875     case OPT_freduce_all_givs:
 876       flag_reduce_all_givs = value;
 877       break;
 878
 879     case OPT_freg_struct_return:
 880       flag_pcc_struct_return = !value;
 881       break;
 882
 883     case OPT_fregmove:
 884       flag_regmove = value;
 885       break;
 886
 887     case OPT_frename_registers:
 888       flag_rename_registers = value;
 889       break;
 890
 891     case OPT_freorder_blocks:
 892       flag_reorder_blocks = value;
 893       break;
 894
 895     case OPT_freorder_functions:
 896       flag_reorder_functions = value;
 897       break;
 898
 899     case OPT_frerun_cse_after_loop:
 900       flag_rerun_cse_after_loop = value;
 901       break;
 902
 903     case OPT_frerun_loop_opt:
 904       flag_rerun_loop_opt = value;
 905       break;
 906
 907     case OPT_fsched_interblock:
 908       flag_schedule_interblock= value;
 909       break;
 910
 911     case OPT_fsched_spec:
 912       flag_schedule_speculative = value;
 913       break;
 914
 915     case OPT_fsched_spec_load:
 916       flag_schedule_speculative_load = value;
 917       break;
 918
 919     case OPT_fsched_spec_load_dangerous:
 920       flag_schedule_speculative_load_dangerous = value;
 921       break;
 922
 923     case OPT_fsched_verbose_:
 924 #ifdef INSN_SCHEDULING
 925       fix_sched_param ("verbose", arg);
 926       break;
 927 #else
 928       return 0;
 929 #endif
 930
 931     case OPT_fsched2_use_superblocks:
 932       flag_sched2_use_superblocks = value;
 933       break;
 934
 935     case OPT_fsched2_use_traces:
 936       flag_sched2_use_traces = value;
 937       break;
 938
 939     case OPT_fschedule_insns:
 940       flag_schedule_insns = value;
 941       break;
 942
 943     case OPT_fschedule_insns2:
 944       flag_schedule_insns_after_reload = value;
 945       break;
 946
 947     case OPT_fshared_data:
 948       flag_shared_data = value;
 949       break;
 950
 951     case OPT_fsignaling_nans:
 952       flag_signaling_nans = value;
 953       break;
 954
 955     case OPT_fsingle_precision_constant:
 956       flag_single_precision_constant = value;
 957       break;
 958
 959     case OPT_fssa:
 960       flag_ssa = value;
 961       break;
 962
 963     case OPT_fssa_ccp:
 964       flag_ssa_ccp = value;
 965       break;
 966
 967     case OPT_fssa_dce:
 968       flag_ssa_dce = value;
 969       break;
 970
 971     case OPT_fstack_check:
 972       flag_stack_check = value;
 973       break;
 974
 975     case OPT_fstack_limit:
 976       /* The real switch is -fno-stack-limit.  */
 977       if (value)
 978         return 0;
 979       stack_limit_rtx = NULL_RTX;
 980       break;
 981
 982     case OPT_fstack_limit_register_:
 983       {
 984         int reg = decode_reg_name (arg);
 985         if (reg < 0)
 986           error ("unrecognized register name \"%s\"", arg);
 987         else
 988           stack_limit_rtx = gen_rtx_REG (Pmode, reg);
 989       }
 990       break;
 991
 992     case OPT_fstack_limit_symbol_:
 993       stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
 994       break;
 995
 996     case OPT_fstrength_reduce:
 997       flag_strength_reduce = value;
 998       break;
 999
1000     case OPT_fstrict_aliasing:
1001       flag_strict_aliasing = value;
1002       break;
1003
1004     case OPT_fsyntax_only:
1005       flag_syntax_only = value;
1006       break;
1007
1008     case OPT_ftest_coverage:
1009       flag_test_coverage = value;
1010       break;
1011
1012     case OPT_fthread_jumps:
1013       flag_thread_jumps = value;
1014       break;
1015
1016     case OPT_ftime_report:
1017       time_report = value;
1018
1019     case OPT_ftls_model_:
1020       if (!strcmp (arg, "global-dynamic"))
1021         flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1022       else if (!strcmp (arg, "local-dynamic"))
1023         flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1024       else if (!strcmp (arg, "initial-exec"))
1025         flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1026       else if (!strcmp (arg, "local-exec"))
1027         flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1028       else
1029         warning ("unknown tls-model \"%s\"", arg);
1030       break;
1031
1032     case OPT_ftracer:
1033       flag_tracer = value;
1034       break;
1035
1036     case OPT_ftrapping_math:
1037       flag_trapping_math = value;
1038       break;
1039
1040     case OPT_ftrapv:
1041       flag_trapv = value;
1042       break;
1043
1044     case OPT_funit_at_a_time:
1045       flag_unit_at_a_time = value;
1046       break;
1047
1048     case OPT_funroll_all_loops:
1049       flag_unroll_all_loops = value;
1050       break;
1051
1052     case OPT_funroll_loops:
1053       flag_unroll_loops = value;
1054       break;
1055
1056     case OPT_funsafe_math_optimizations:
1057       flag_unsafe_math_optimizations = value;
1058       break;
1059
1060     case OPT_funswitch_loops:
1061       flag_unswitch_loops = value;
1062       break;
1063
1064     case OPT_funwind_tables:
1065       flag_unwind_tables = value;
1066       break;
1067
1068     case OPT_fverbose_asm:
1069       flag_verbose_asm = value;
1070       break;
1071
1072     case OPT_fwrapv:
1073       flag_wrapv = value;
1074       break;
1075
1076     case OPT_fwritable_strings:
1077       flag_writable_strings = value;
1078       break;
1079
1080     case OPT_fzero_initialized_in_bss:
1081       flag_zero_initialized_in_bss = value;
1082       break;
1083
1084     case OPT_g:
1085       decode_g_option (arg);
1086       break;
1087
1088     case OPT_m:
1089       set_target_switch (arg);
1090       break;
1091
1092     case OPT_o:
1093       asm_file_name = arg;
1094       break;
1095
1096     case OPT_p:
1097       profile_flag = 1;
1098       break;
1099
1100     case OPT_pedantic:
1101       pedantic = 1;
1102       break;
1103
1104     case OPT_pedantic_errors:
1105       flag_pedantic_errors = pedantic = 1;
1106       break;
1107
1108     case OPT_quiet:
1109       quiet_flag = 1;
1110       break;
1111
1112     case OPT_version:
1113       version_flag = 1;
1114       break;
1115
1116     case OPT_w:
1117       inhibit_warnings = true;
1118       break;
1119     }
1120
1121   return 1;
1122 }
1123
1124 /* Handle --param NAME=VALUE.  */
1125 static void
1126 handle_param (const char *carg)
1127 {
1128   char *equal, *arg;
1129   int value;
1130
1131   arg = xstrdup (carg);
1132   equal = strchr (arg, '=');
1133   if (!equal)
1134     error ("%s: --param arguments should be of the form NAME=VALUE", arg);
1135   else
1136     {
1137       value = integral_argument (equal + 1);
1138       if (value == -1)
1139         error ("invalid --param value `%s'", equal + 1);
1140       else
1141         {
1142           *equal = '\0';
1143           set_param_value (arg, value);
1144         }
1145     }
1146
1147   free (arg);
1148 }
1149
1150 /* Handle -W and -Wextra.  */
1151 static void
1152 set_Wextra (int setting)
1153 {
1154   extra_warnings = setting;
1155   warn_unused_value = setting;
1156   warn_unused_parameter = (setting && maybe_warn_unused_parameter);
1157
1158   /* We save the value of warn_uninitialized, since if they put
1159      -Wuninitialized on the command line, we need to generate a
1160      warning about not using it without also specifying -O.  */
1161   if (setting == 0)
1162     warn_uninitialized = 0;
1163   else if (warn_uninitialized != 1)
1164     warn_uninitialized = 2;
1165 }
1166
1167 /* Initialize unused warning flags.  */
1168 void
1169 set_Wunused (int setting)
1170 {
1171   warn_unused_function = setting;
1172   warn_unused_label = setting;
1173   /* Unused function parameter warnings are reported when either
1174      ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1175      Thus, if -Wextra has already been seen, set warn_unused_parameter;
1176      otherwise set maybe_warn_extra_parameter, which will be picked up
1177      by set_Wextra.  */
1178   maybe_warn_unused_parameter = setting;
1179   warn_unused_parameter = (setting && extra_warnings);
1180   warn_unused_variable = setting;
1181   warn_unused_value = setting;
1182 }
1183
1184 /* The following routines are useful in setting all the flags that
1185    -ffast-math and -fno-fast-math imply.  */
1186 void
1187 set_fast_math_flags (int set)
1188 {
1189   flag_trapping_math = !set;
1190   flag_unsafe_math_optimizations = set;
1191   flag_finite_math_only = set;
1192   flag_errno_math = !set;
1193   if (set)
1194     flag_signaling_nans = 0;
1195 }
1196
1197 /* Return true iff flags are set as if -ffast-math.  */
1198 bool
1199 fast_math_flags_set_p (void)
1200 {
1201   return (!flag_trapping_math
1202           && flag_unsafe_math_optimizations
1203           && flag_finite_math_only
1204           && !flag_errno_math);
1205 }