gcc/c-opts.c

   1 /* C/ObjC/C++ 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 "c-common.h"
  28 #include "c-pragma.h"
  29 #include "flags.h"
  30 #include "toplev.h"
  31 #include "langhooks.h"
  32 #include "tree-inline.h"
  33 #include "diagnostic.h"
  34 #include "intl.h"
  35 #include "cppdefault.h"
  36 #include "c-incpath.h"
  37 #include "debug.h"              /* For debug_hooks.  */
  38 #include "opts.h"
  39 #include "options.h"
  40
  41 #ifndef DOLLARS_IN_IDENTIFIERS
  42 # define DOLLARS_IN_IDENTIFIERS true
  43 #endif
  44
  45 #ifndef TARGET_SYSTEM_ROOT
  46 # define TARGET_SYSTEM_ROOT NULL
  47 #endif
  48
  49 static int saved_lineno;
  50
  51 /* CPP's options.  */
  52 static cpp_options *cpp_opts;
  53
  54 /* Input filename.  */
  55 static const char *this_input_filename;
  56
  57 /* Filename and stream for preprocessed output.  */
  58 static const char *out_fname;
  59 static FILE *out_stream;
  60
  61 /* Append dependencies to deps_file.  */
  62 static bool deps_append;
  63
  64 /* If dependency switches (-MF etc.) have been given.  */
  65 static bool deps_seen;
  66
  67 /* If -v seen.  */
  68 static bool verbose;
  69
  70 /* Dependency output file.  */
  71 static const char *deps_file;
  72
  73 /* The prefix given by -iprefix, if any.  */
  74 static const char *iprefix;
  75
  76 /* The system root, if any.  Overridden by -isysroot.  */
  77 static const char *sysroot = TARGET_SYSTEM_ROOT;
  78
  79 /* Zero disables all standard directories for headers.  */
  80 static bool std_inc = true;
  81
  82 /* Zero disables the C++-specific standard directories for headers.  */
  83 static bool std_cxx_inc = true;
  84
  85 /* If the quote chain has been split by -I-.  */
  86 static bool quote_chain_split;
  87
  88 /* If -Wunused-macros.  */
  89 static bool warn_unused_macros;
  90
  91 /* Number of deferred options.  */
  92 static size_t deferred_count;
  93
  94 /* Number of deferred options scanned for -include.  */
  95 static size_t include_cursor;
  96
  97 /* Permit Fotran front-end options.  */
  98 static bool permit_fortran_options;
  99
 100 static void set_Wimplicit (int);
 101 static void handle_OPT_d (const char *);
 102 static void set_std_cxx98 (int);
 103 static void set_std_c89 (int, int);
 104 static void set_std_c99 (int);
 105 static void check_deps_environment_vars (void);
 106 static void handle_deferred_opts (void);
 107 static void sanitize_cpp_opts (void);
 108 static void add_prefixed_path (const char *, size_t);
 109 static void push_command_line_include (void);
 110 static void cb_file_change (cpp_reader *, const struct line_map *);
 111 static void finish_options (const char *);
 112
 113 #ifndef STDC_0_IN_SYSTEM_HEADERS
 114 #define STDC_0_IN_SYSTEM_HEADERS 0
 115 #endif
 116
 117 /* Holds switches parsed by c_common_handle_option (), but whose
 118    handling is deferred to c_common_post_options ().  */
 119 static void defer_opt (enum opt_code, const char *);
 120 static struct deferred_opt
 121 {
 122   enum opt_code code;
 123   const char *arg;
 124 } *deferred_opts;
 125
 126 /* Complain that switch CODE expects an argument but none was
 127    provided.  OPT was the command-line option.  Return FALSE to get
 128    the default message in opts.c, TRUE if we provide a specialized
 129    one.  */
 130 bool
 131 c_common_missing_argument (const char *opt, size_t code)
 132 {
 133   switch (code)
 134     {
 135     default:
 136       /* Pick up the default message.  */
 137       return false;
 138
 139     case OPT_fconstant_string_class_:
 140       error ("no class name specified with \"%s\"", opt);
 141       break;
 142
 143     case OPT_A:
 144       error ("assertion missing after \"%s\"", opt);
 145       break;
 146
 147     case OPT_D:
 148     case OPT_U:
 149       error ("macro name missing after \"%s\"", opt);
 150       break;
 151
 152     case OPT_I:
 153     case OPT_idirafter:
 154     case OPT_isysroot:
 155     case OPT_isystem:
 156       error ("missing path after \"%s\"", opt);
 157       break;
 158
 159     case OPT_MF:
 160     case OPT_MD:
 161     case OPT_MMD:
 162     case OPT_include:
 163     case OPT_imacros:
 164     case OPT_o:
 165       error ("missing filename after \"%s\"", opt);
 166       break;
 167
 168     case OPT_MQ:
 169     case OPT_MT:
 170       error ("missing makefile target after \"%s\"", opt);
 171       break;
 172     }
 173
 174   return true;
 175 }
 176
 177 /* Defer option CODE with argument ARG.  */
 178 static void
 179 defer_opt (enum opt_code code, const char *arg)
 180 {
 181   deferred_opts[deferred_count].code = code;
 182   deferred_opts[deferred_count].arg = arg;
 183   deferred_count++;
 184 }
 185
 186 /* Common initialization before parsing options.  */
 187 unsigned int
 188 c_common_init_options (unsigned int argc, const char **argv ATTRIBUTE_UNUSED)
 189 {
 190   static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
 191   unsigned int result;
 192
 193   /* This is conditionalized only because that is the way the front
 194      ends used to do it.  Maybe this should be unconditional?  */
 195   if (c_dialect_cxx ())
 196     {
 197       /* By default wrap lines at 80 characters.  Is getenv
 198          ("COLUMNS") preferable?  */
 199       diagnostic_line_cutoff (global_dc) = 80;
 200       /* By default, emit location information once for every
 201          diagnostic message.  */
 202       diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
 203     }
 204
 205   parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
 206                                 ident_hash);
 207
 208   cpp_opts = cpp_get_options (parse_in);
 209   cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
 210   cpp_opts->objc = c_dialect_objc ();
 211
 212   /* Reset to avoid warnings on internal definitions.  We set it just
 213      before passing on command-line options to cpplib.  */
 214   cpp_opts->warn_dollars = 0;
 215
 216   flag_const_strings = c_dialect_cxx ();
 217   flag_exceptions = c_dialect_cxx ();
 218   warn_pointer_arith = c_dialect_cxx ();
 219
 220   deferred_opts = xmalloc (argc * sizeof (struct deferred_opt));
 221
 222   result = lang_flags[c_language];
 223
 224   /* If potentially preprocessing Fortran we have to accept its front
 225      end options since the driver passes most of them through.  */
 226 #ifdef CL_F77
 227   if (c_language == clk_c && argc > 2
 228       && !strcmp (argv[2], "-traditional-cpp" ))
 229     {
 230       permit_fortran_options = true;
 231       result |= CL_F77;
 232     }
 233 #endif
 234
 235   return result;
 236 }
 237
 238 /* Handle switch SCODE with argument ARG.  VALUE is true, unless no-
 239    form of an -f or -W option was given.  Returns 0 if the switch was
 240    invalid, a negative number to prevent language-independent
 241    processing in toplev.c (a hack necessary for the short-term).  */
 242 int
 243 c_common_handle_option (size_t scode, const char *arg, int value)
 244 {
 245   const struct cl_option *option = &cl_options[scode];
 246   enum opt_code code = (enum opt_code) scode;
 247   int result = 1;
 248
 249   switch (code)
 250     {
 251     default:
 252       result = permit_fortran_options;
 253       break;
 254
 255     case OPT__output_pch_:
 256       pch_file = arg;
 257       break;
 258
 259     case OPT_A:
 260       defer_opt (code, arg);
 261       break;
 262
 263     case OPT_C:
 264       cpp_opts->discard_comments = 0;
 265       break;
 266
 267     case OPT_CC:
 268       cpp_opts->discard_comments = 0;
 269       cpp_opts->discard_comments_in_macro_exp = 0;
 270       break;
 271
 272     case OPT_D:
 273       defer_opt (code, arg);
 274       break;
 275
 276     case OPT_E:
 277       flag_preprocess_only = 1;
 278       break;
 279
 280     case OPT_H:
 281       cpp_opts->print_include_names = 1;
 282       break;
 283
 284     case OPT_I:
 285       if (strcmp (arg, "-"))
 286         add_path (xstrdup (arg), BRACKET, 0);
 287       else
 288         {
 289           if (quote_chain_split)
 290             error ("-I- specified twice");
 291           quote_chain_split = true;
 292           split_quote_chain ();
 293         }
 294       break;
 295
 296     case OPT_M:
 297     case OPT_MM:
 298       /* When doing dependencies with -M or -MM, suppress normal
 299          preprocessed output, but still do -dM etc. as software
 300          depends on this.  Preprocessed output does occur if -MD, -MMD
 301          or environment var dependency generation is used.  */
 302       cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
 303       flag_no_output = 1;
 304       cpp_opts->inhibit_warnings = 1;
 305       break;
 306
 307     case OPT_MD:
 308     case OPT_MMD:
 309       cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
 310       deps_file = arg;
 311       break;
 312
 313     case OPT_MF:
 314       deps_seen = true;
 315       deps_file = arg;
 316       break;
 317
 318     case OPT_MG:
 319       deps_seen = true;
 320       cpp_opts->deps.missing_files = true;
 321       break;
 322
 323     case OPT_MP:
 324       deps_seen = true;
 325       cpp_opts->deps.phony_targets = true;
 326       break;
 327
 328     case OPT_MQ:
 329     case OPT_MT:
 330       deps_seen = true;
 331       defer_opt (code, arg);
 332       break;
 333
 334     case OPT_P:
 335       flag_no_line_commands = 1;
 336       break;
 337
 338     case OPT_fworking_directory:
 339       flag_working_directory = value;
 340       break;
 341
 342     case OPT_U:
 343       defer_opt (code, arg);
 344       break;
 345
 346     case OPT_Wabi:
 347       warn_abi = value;
 348       break;
 349
 350     case OPT_Wall:
 351       set_Wunused (value);
 352       set_Wformat (value);
 353       set_Wimplicit (value);
 354       warn_char_subscripts = value;
 355       warn_missing_braces = value;
 356       warn_parentheses = value;
 357       warn_return_type = value;
 358       warn_sequence_point = value;      /* Was C only.  */
 359       if (c_dialect_cxx ())
 360         warn_sign_compare = value;
 361       warn_switch = value;
 362       warn_strict_aliasing = value;
 363
 364       /* Only warn about unknown pragmas that are not in system
 365          headers.  */
 366       warn_unknown_pragmas = value;
 367
 368       /* We save the value of warn_uninitialized, since if they put
 369          -Wuninitialized on the command line, we need to generate a
 370          warning about not using it without also specifying -O.  */
 371       if (warn_uninitialized != 1)
 372         warn_uninitialized = (value ? 2 : 0);
 373
 374       if (!c_dialect_cxx ())
 375         /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
 376            can turn it off only if it's not explicit.  */
 377         warn_main = value * 2;
 378       else
 379         {
 380           /* C++-specific warnings.  */
 381           warn_nonvdtor = value;
 382           warn_reorder = value;
 383           warn_nontemplate_friend = value;
 384         }
 385
 386       cpp_opts->warn_trigraphs = value;
 387       cpp_opts->warn_comments = value;
 388       cpp_opts->warn_num_sign_change = value;
 389       cpp_opts->warn_multichar = value; /* Was C++ only.  */
 390       break;
 391
 392     case OPT_Wbad_function_cast:
 393       warn_bad_function_cast = value;
 394       break;
 395
 396     case OPT_Wcast_qual:
 397       warn_cast_qual = value;
 398       break;
 399
 400     case OPT_Wchar_subscripts:
 401       warn_char_subscripts = value;
 402       break;
 403
 404     case OPT_Wcomment:
 405     case OPT_Wcomments:
 406       cpp_opts->warn_comments = value;
 407       break;
 408
 409     case OPT_Wconversion:
 410       warn_conversion = value;
 411       break;
 412
 413     case OPT_Wctor_dtor_privacy:
 414       warn_ctor_dtor_privacy = value;
 415       break;
 416
 417     case OPT_Wdeclaration_after_statement:
 418       warn_declaration_after_statement = value;
 419       break;
 420
 421     case OPT_Wdeprecated:
 422       warn_deprecated = value;
 423       cpp_opts->warn_deprecated = value;
 424       break;
 425
 426     case OPT_Wdiv_by_zero:
 427       warn_div_by_zero = value;
 428       break;
 429
 430     case OPT_Weffc__:
 431       warn_ecpp = value;
 432       break;
 433
 434     case OPT_Wendif_labels:
 435       cpp_opts->warn_endif_labels = value;
 436       break;
 437
 438     case OPT_Werror:
 439       cpp_opts->warnings_are_errors = value;
 440       break;
 441
 442     case OPT_Werror_implicit_function_declaration:
 443       mesg_implicit_function_declaration = 2;
 444       break;
 445
 446     case OPT_Wfloat_equal:
 447       warn_float_equal = value;
 448       break;
 449
 450     case OPT_Wformat:
 451       set_Wformat (value);
 452       break;
 453
 454     case OPT_Wformat_:
 455       set_Wformat (atoi (arg));
 456       break;
 457
 458     case OPT_Wformat_extra_args:
 459       warn_format_extra_args = value;
 460       break;
 461
 462     case OPT_Wformat_nonliteral:
 463       warn_format_nonliteral = value;
 464       break;
 465
 466     case OPT_Wformat_security:
 467       warn_format_security = value;
 468       break;
 469
 470     case OPT_Wformat_y2k:
 471       warn_format_y2k = value;
 472       break;
 473
 474     case OPT_Wformat_zero_length:
 475       warn_format_zero_length = value;
 476       break;
 477
 478     case OPT_Wimplicit:
 479       set_Wimplicit (value);
 480       break;
 481
 482     case OPT_Wimplicit_function_declaration:
 483       mesg_implicit_function_declaration = value;
 484       break;
 485
 486     case OPT_Wimplicit_int:
 487       warn_implicit_int = value;
 488       break;
 489
 490     case OPT_Wimport:
 491       /* Silently ignore for now.  */
 492       break;
 493
 494     case OPT_Winvalid_offsetof:
 495       warn_invalid_offsetof = value;
 496       break;
 497
 498     case OPT_Winvalid_pch:
 499       cpp_opts->warn_invalid_pch = value;
 500       break;
 501
 502     case OPT_Wlong_long:
 503       warn_long_long = value;
 504       break;
 505
 506     case OPT_Wmain:
 507       if (value)
 508         warn_main = 1;
 509       else
 510         warn_main = -1;
 511       break;
 512
 513     case OPT_Wmissing_braces:
 514       warn_missing_braces = value;
 515       break;
 516
 517     case OPT_Wmissing_declarations:
 518       warn_missing_declarations = value;
 519       break;
 520
 521     case OPT_Wmissing_format_attribute:
 522       warn_missing_format_attribute = value;
 523       break;
 524
 525     case OPT_Wmissing_prototypes:
 526       warn_missing_prototypes = value;
 527       break;
 528
 529     case OPT_Wmultichar:
 530       cpp_opts->warn_multichar = value;
 531       break;
 532
 533     case OPT_Wnested_externs:
 534       warn_nested_externs = value;
 535       break;
 536
 537     case OPT_Wnon_template_friend:
 538       warn_nontemplate_friend = value;
 539       break;
 540
 541     case OPT_Wnon_virtual_dtor:
 542       warn_nonvdtor = value;
 543       break;
 544
 545     case OPT_Wnonnull:
 546       warn_nonnull = value;
 547       break;
 548
 549     case OPT_Wold_style_cast:
 550       warn_old_style_cast = value;
 551       break;
 552
 553     case OPT_Woverloaded_virtual:
 554       warn_overloaded_virtual = value;
 555       break;
 556
 557     case OPT_Wparentheses:
 558       warn_parentheses = value;
 559       break;
 560
 561     case OPT_Wpmf_conversions:
 562       warn_pmf2ptr = value;
 563       break;
 564
 565     case OPT_Wpointer_arith:
 566       warn_pointer_arith = value;
 567       break;
 568
 569     case OPT_Wprotocol:
 570       warn_protocol = value;
 571       break;
 572
 573     case OPT_Wselector:
 574       warn_selector = value;
 575       break;
 576
 577     case OPT_Wredundant_decls:
 578       warn_redundant_decls = value;
 579       break;
 580
 581     case OPT_Wreorder:
 582       warn_reorder = value;
 583       break;
 584
 585     case OPT_Wreturn_type:
 586       warn_return_type = value;
 587       break;
 588
 589     case OPT_Wsequence_point:
 590       warn_sequence_point = value;
 591       break;
 592
 593     case OPT_Wsign_compare:
 594       warn_sign_compare = value;
 595       break;
 596
 597     case OPT_Wsign_promo:
 598       warn_sign_promo = value;
 599       break;
 600
 601     case OPT_Wstrict_prototypes:
 602       warn_strict_prototypes = value;
 603       break;
 604
 605     case OPT_Wsynth:
 606       warn_synth = value;
 607       break;
 608
 609     case OPT_Wsystem_headers:
 610       cpp_opts->warn_system_headers = value;
 611       break;
 612
 613     case OPT_Wtraditional:
 614       warn_traditional = value;
 615       cpp_opts->warn_traditional = value;
 616       break;
 617
 618     case OPT_Wtrigraphs:
 619       cpp_opts->warn_trigraphs = value;
 620       break;
 621
 622     case OPT_Wundeclared_selector:
 623       warn_undeclared_selector = value;
 624       break;
 625
 626     case OPT_Wundef:
 627       cpp_opts->warn_undef = value;
 628       break;
 629
 630     case OPT_Wunknown_pragmas:
 631       /* Set to greater than 1, so that even unknown pragmas in
 632          system headers will be warned about.  */
 633       warn_unknown_pragmas = value * 2;
 634       break;
 635
 636     case OPT_Wunused_macros:
 637       warn_unused_macros = value;
 638       break;
 639
 640     case OPT_Wwrite_strings:
 641       if (!c_dialect_cxx ())
 642         flag_const_strings = value;
 643       else
 644         warn_write_strings = value;
 645       break;
 646
 647     case OPT_ansi:
 648       if (!c_dialect_cxx ())
 649         set_std_c89 (false, true);
 650       else
 651         set_std_cxx98 (true);
 652       break;
 653
 654     case OPT_d:
 655       handle_OPT_d (arg);
 656       break;
 657
 658     case OPT_fcond_mismatch:
 659       if (!c_dialect_cxx ())
 660         {
 661           flag_cond_mismatch = value;
 662           break;
 663         }
 664       /* Fall through.  */
 665
 666     case OPT_fall_virtual:
 667     case OPT_fenum_int_equiv:
 668     case OPT_fguiding_decls:
 669     case OPT_fhonor_std:
 670     case OPT_fhuge_objects:
 671     case OPT_flabels_ok:
 672     case OPT_fname_mangling_version_:
 673     case OPT_fnew_abi:
 674     case OPT_fnonnull_objects:
 675     case OPT_fsquangle:
 676     case OPT_fstrict_prototype:
 677     case OPT_fthis_is_variable:
 678     case OPT_fvtable_thunks:
 679     case OPT_fxref:
 680     case OPT_fvtable_gc:
 681       warning ("switch \"%s\" is no longer supported", option->opt_text);
 682       break;
 683
 684     case OPT_fabi_version_:
 685       flag_abi_version = value;
 686       break;
 687
 688     case OPT_faccess_control:
 689       flag_access_control = value;
 690       break;
 691
 692     case OPT_falt_external_templates:
 693       flag_alt_external_templates = value;
 694       if (value)
 695         flag_external_templates = true;
 696     cp_deprecated:
 697       warning ("switch \"%s\" is deprecated, please see documentation "
 698                "for details", option->opt_text);
 699       break;
 700
 701     case OPT_fasm:
 702       flag_no_asm = !value;
 703       break;
 704
 705     case OPT_fbuiltin:
 706       flag_no_builtin = !value;
 707       break;
 708
 709     case OPT_fbuiltin_:
 710       if (value)
 711         result = 0;
 712       else
 713         disable_builtin_function (arg);
 714       break;
 715
 716     case OPT_fdollars_in_identifiers:
 717       cpp_opts->dollars_in_ident = value;
 718       break;
 719
 720     case OPT_fdump_:
 721       if (!dump_switch_p (arg))
 722         result = 0;
 723       break;
 724
 725     case OPT_ffreestanding:
 726       value = !value;
 727       /* Fall through....  */
 728     case OPT_fhosted:
 729       flag_hosted = value;
 730       flag_no_builtin = !value;
 731       /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
 732       if (!value && warn_main == 2)
 733         warn_main = 0;
 734       break;
 735
 736     case OPT_fshort_double:
 737       flag_short_double = value;
 738       break;
 739
 740     case OPT_fshort_enums:
 741       flag_short_enums = value;
 742       break;
 743
 744     case OPT_fshort_wchar:
 745       flag_short_wchar = value;
 746       break;
 747
 748     case OPT_fsigned_bitfields:
 749       flag_signed_bitfields = value;
 750       explicit_flag_signed_bitfields = 1;
 751       break;
 752
 753     case OPT_fsigned_char:
 754       flag_signed_char = value;
 755       break;
 756
 757     case OPT_funsigned_bitfields:
 758       flag_signed_bitfields = !value;
 759       explicit_flag_signed_bitfields = 1;
 760       break;
 761
 762     case OPT_funsigned_char:
 763       flag_signed_char = !value;
 764       break;
 765
 766     case OPT_fcheck_new:
 767       flag_check_new = value;
 768       break;
 769
 770     case OPT_fconserve_space:
 771       flag_conserve_space = value;
 772       break;
 773
 774     case OPT_fconst_strings:
 775       flag_const_strings = value;
 776       break;
 777
 778     case OPT_fconstant_string_class_:
 779       constant_string_class_name = arg;
 780       break;
 781
 782     case OPT_fdefault_inline:
 783       flag_default_inline = value;
 784       break;
 785
 786     case OPT_felide_constructors:
 787       flag_elide_constructors = value;
 788       break;
 789
 790     case OPT_fenforce_eh_specs:
 791       flag_enforce_eh_specs = value;
 792       break;
 793
 794     case OPT_fexternal_templates:
 795       flag_external_templates = value;
 796       goto cp_deprecated;
 797
 798     case OPT_ffixed_form:
 799     case OPT_ffixed_line_length_:
 800       /* Fortran front end options ignored when preprocessing only.  */
 801       if (!flag_preprocess_only)
 802         result = 0;
 803       break;
 804
 805     case OPT_ffor_scope:
 806       flag_new_for_scope = value;
 807       break;
 808
 809     case OPT_fgnu_keywords:
 810       flag_no_gnu_keywords = !value;
 811       break;
 812
 813     case OPT_fgnu_runtime:
 814       flag_next_runtime = !value;
 815       break;
 816
 817     case OPT_fhandle_exceptions:
 818       warning ("-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
 819       flag_exceptions = value;
 820       break;
 821
 822     case OPT_fimplement_inlines:
 823       flag_implement_inlines = value;
 824       break;
 825
 826     case OPT_fimplicit_inline_templates:
 827       flag_implicit_inline_templates = value;
 828       break;
 829
 830     case OPT_fimplicit_templates:
 831       flag_implicit_templates = value;
 832       break;
 833
 834     case OPT_fms_extensions:
 835       flag_ms_extensions = value;
 836       break;
 837
 838     case OPT_fnext_runtime:
 839       flag_next_runtime = value;
 840       break;
 841
 842     case OPT_fnonansi_builtins:
 843       flag_no_nonansi_builtin = !value;
 844       break;
 845
 846     case OPT_foperator_names:
 847       cpp_opts->operator_names = value;
 848       break;
 849
 850     case OPT_foptional_diags:
 851       flag_optional_diags = value;
 852       break;
 853
 854     case OPT_fpch_deps:
 855       cpp_opts->restore_pch_deps = value;
 856       break;
 857
 858     case OPT_fpermissive:
 859       flag_permissive = value;
 860       break;
 861
 862     case OPT_fpreprocessed:
 863       cpp_opts->preprocessed = value;
 864       break;
 865
 866     case OPT_frepo:
 867       flag_use_repository = value;
 868       if (value)
 869         flag_implicit_templates = 0;
 870       break;
 871
 872     case OPT_frtti:
 873       flag_rtti = value;
 874       break;
 875
 876     case OPT_fshow_column:
 877       cpp_opts->show_column = value;
 878       break;
 879
 880     case OPT_fstats:
 881       flag_detailed_statistics = value;
 882       break;
 883
 884     case OPT_ftabstop_:
 885       /* It is documented that we silently ignore silly values.  */
 886       if (value >= 1 && value <= 100)
 887         cpp_opts->tabstop = value;
 888       break;
 889
 890     case OPT_fexec_charset_:
 891       cpp_opts->narrow_charset = arg;
 892       break;
 893
 894     case OPT_fwide_exec_charset_:
 895       cpp_opts->wide_charset = arg;
 896       break;
 897
 898     case OPT_ftemplate_depth_:
 899       max_tinst_depth = value;
 900       break;
 901
 902     case OPT_fuse_cxa_atexit:
 903       flag_use_cxa_atexit = value;
 904       break;
 905
 906     case OPT_fweak:
 907       flag_weak = value;
 908       break;
 909
 910     case OPT_gen_decls:
 911       flag_gen_declaration = 1;
 912       break;
 913
 914     case OPT_idirafter:
 915       add_path (xstrdup (arg), AFTER, 0);
 916       break;
 917
 918     case OPT_imacros:
 919     case OPT_include:
 920       defer_opt (code, arg);
 921       break;
 922
 923     case OPT_iprefix:
 924       iprefix = arg;
 925       break;
 926
 927     case OPT_isysroot:
 928       sysroot = arg;
 929       break;
 930
 931     case OPT_isystem:
 932       add_path (xstrdup (arg), SYSTEM, 0);
 933       break;
 934
 935     case OPT_iwithprefix:
 936       add_prefixed_path (arg, SYSTEM);
 937       break;
 938
 939     case OPT_iwithprefixbefore:
 940       add_prefixed_path (arg, BRACKET);
 941       break;
 942
 943     case OPT_lang_asm:
 944       cpp_set_lang (parse_in, CLK_ASM);
 945       cpp_opts->dollars_in_ident = false;
 946       break;
 947
 948     case OPT_lang_objc:
 949       cpp_opts->objc = 1;
 950       break;
 951
 952     case OPT_nostdinc:
 953       std_inc = false;
 954       break;
 955
 956     case OPT_nostdinc__:
 957       std_cxx_inc = false;
 958       break;
 959
 960     case OPT_o:
 961       if (!out_fname)
 962         out_fname = arg;
 963       else
 964         error ("output filename specified twice");
 965       break;
 966
 967       /* We need to handle the -pedantic switches here, rather than in
 968          c_common_post_options, so that a subsequent -Wno-endif-labels
 969          is not overridden.  */
 970     case OPT_pedantic_errors:
 971       cpp_opts->pedantic_errors = 1;
 972       /* Fall through.  */
 973     case OPT_pedantic:
 974       cpp_opts->pedantic = 1;
 975       cpp_opts->warn_endif_labels = 1;
 976       break;
 977
 978     case OPT_print_objc_runtime_info:
 979       print_struct_values = 1;
 980       break;
 981
 982     case OPT_remap:
 983       cpp_opts->remap = 1;
 984       break;
 985
 986     case OPT_std_c__98:
 987     case OPT_std_gnu__98:
 988       set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
 989       break;
 990
 991     case OPT_std_c89:
 992     case OPT_std_iso9899_1990:
 993     case OPT_std_iso9899_199409:
 994       set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
 995       break;
 996
 997     case OPT_std_gnu89:
 998       set_std_c89 (false /* c94 */, false /* ISO */);
 999       break;
1000
1001     case OPT_std_c99:
1002     case OPT_std_c9x:
1003     case OPT_std_iso9899_1999:
1004     case OPT_std_iso9899_199x:
1005       set_std_c99 (true /* ISO */);
1006       break;
1007
1008     case OPT_std_gnu99:
1009     case OPT_std_gnu9x:
1010       set_std_c99 (false /* ISO */);
1011       break;
1012
1013     case OPT_trigraphs:
1014       cpp_opts->trigraphs = 1;
1015       break;
1016
1017     case OPT_traditional_cpp:
1018       cpp_opts->traditional = 1;
1019       break;
1020
1021     case OPT_undef:
1022       flag_undef = 1;
1023       break;
1024
1025     case OPT_w:
1026       cpp_opts->inhibit_warnings = 1;
1027       break;
1028
1029     case OPT_v:
1030       verbose = true;
1031       break;
1032     }
1033
1034   return result;
1035 }
1036
1037 /* Post-switch processing.  */
1038 bool
1039 c_common_post_options (const char **pfilename)
1040 {
1041   /* Canonicalize the input and output filenames.  */
1042   if (in_fnames == NULL)
1043     {
1044       in_fnames = xmalloc (sizeof (in_fnames[0]));
1045       in_fnames[0] = "";
1046     }
1047   else if (strcmp (in_fnames[0], "-") == 0)
1048     in_fnames[0] = "";
1049
1050   if (out_fname == NULL || !strcmp (out_fname, "-"))
1051     out_fname = "";
1052
1053   if (cpp_opts->deps.style == DEPS_NONE)
1054     check_deps_environment_vars ();
1055
1056   handle_deferred_opts ();
1057
1058   sanitize_cpp_opts ();
1059
1060   register_include_chains (parse_in, sysroot, iprefix,
1061                            std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1062
1063   flag_inline_trees = 1;
1064
1065   /* Use tree inlining if possible.  Function instrumentation is only
1066      done in the RTL level, so we disable tree inlining.  */
1067   if (! flag_instrument_function_entry_exit)
1068     {
1069       if (!flag_no_inline)
1070         flag_no_inline = 1;
1071       if (flag_inline_functions)
1072         {
1073           flag_inline_trees = 2;
1074           flag_inline_functions = 0;
1075         }
1076     }
1077
1078   /* -Wextra implies -Wsign-compare, but not if explicitly
1079       overridden.  */
1080   if (warn_sign_compare == -1)
1081     warn_sign_compare = extra_warnings;
1082
1083   /* Special format checking options don't work without -Wformat; warn if
1084      they are used.  */
1085   if (warn_format_y2k && !warn_format)
1086     warning ("-Wformat-y2k ignored without -Wformat");
1087   if (warn_format_extra_args && !warn_format)
1088     warning ("-Wformat-extra-args ignored without -Wformat");
1089   if (warn_format_zero_length && !warn_format)
1090     warning ("-Wformat-zero-length ignored without -Wformat");
1091   if (warn_format_nonliteral && !warn_format)
1092     warning ("-Wformat-nonliteral ignored without -Wformat");
1093   if (warn_format_security && !warn_format)
1094     warning ("-Wformat-security ignored without -Wformat");
1095   if (warn_missing_format_attribute && !warn_format)
1096     warning ("-Wmissing-format-attribute ignored without -Wformat");
1097
1098   if (flag_preprocess_only)
1099     {
1100       /* Open the output now.  We must do so even if flag_no_output is
1101          on, because there may be other output than from the actual
1102          preprocessing (e.g. from -dM).  */
1103       if (out_fname[0] == '\0')
1104         out_stream = stdout;
1105       else
1106         out_stream = fopen (out_fname, "w");
1107
1108       if (out_stream == NULL)
1109         {
1110           fatal_error ("opening output file %s: %m", out_fname);
1111           return false;
1112         }
1113
1114       if (num_in_fnames > 1)
1115         error ("too many filenames given.  Type %s --help for usage",
1116                progname);
1117
1118       init_pp_output (out_stream);
1119     }
1120   else
1121     {
1122       init_c_lex ();
1123
1124       /* Yuk.  WTF is this?  I do know ObjC relies on it somewhere.  */
1125       input_line = 0;
1126     }
1127
1128   cpp_get_callbacks (parse_in)->file_change = cb_file_change;
1129
1130   /* NOTE: we use in_fname here, not the one supplied.  */
1131   *pfilename = cpp_read_main_file (parse_in, in_fnames[0]);
1132
1133   saved_lineno = input_line;
1134   input_line = 0;
1135
1136   /* If an error has occurred in cpplib, note it so we fail
1137      immediately.  */
1138   errorcount += cpp_errors (parse_in);
1139
1140   return flag_preprocess_only;
1141 }
1142
1143 /* Front end initialization common to C, ObjC and C++.  */
1144 bool
1145 c_common_init (void)
1146 {
1147   input_line = saved_lineno;
1148
1149   /* Set up preprocessor arithmetic.  Must be done after call to
1150      c_common_nodes_and_builtins for type nodes to be good.  */
1151   cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1152   cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1153   cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1154   cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1155   cpp_opts->unsigned_wchar = TREE_UNSIGNED (wchar_type_node);
1156   cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1157
1158   /* This can't happen until after wchar_precision and bytes_big_endian
1159      are known.  */
1160   cpp_init_iconv (parse_in);
1161
1162   if (flag_preprocess_only)
1163     {
1164       finish_options (in_fnames[0]);
1165       preprocess_file (parse_in);
1166       return false;
1167     }
1168
1169   /* Has to wait until now so that cpplib has its hash table.  */
1170   init_pragma ();
1171
1172   return true;
1173 }
1174
1175 /* Initialize the integrated preprocessor after debug output has been
1176    initialized; loop over each input file.  */
1177 void
1178 c_common_parse_file (int set_yydebug ATTRIBUTE_UNUSED)
1179 {
1180   unsigned file_index;
1181
1182 #if YYDEBUG != 0
1183   yydebug = set_yydebug;
1184 #else
1185   warning ("YYDEBUG not defined");
1186 #endif
1187
1188   file_index = 0;
1189
1190   do
1191     {
1192       if (file_index > 0)
1193         {
1194           /* Reset the state of the parser.  */
1195           c_reset_state();
1196
1197           /* Reset cpplib's macros and start a new file.  */
1198           cpp_undef_all (parse_in);
1199           cpp_stack_file (parse_in, in_fnames[file_index]);
1200         }
1201
1202       finish_options(in_fnames[file_index]);
1203       if (file_index == 0)
1204         pch_init();
1205       c_parse_file ();
1206
1207       file_index++;
1208     } while (file_index < num_in_fnames);
1209
1210   free_parser_stacks ();
1211   finish_file ();
1212 }
1213
1214 /* Common finish hook for the C, ObjC and C++ front ends.  */
1215 void
1216 c_common_finish (void)
1217 {
1218   FILE *deps_stream = NULL;
1219
1220   if (cpp_opts->deps.style != DEPS_NONE)
1221     {
1222       /* If -M or -MM was seen without -MF, default output to the
1223          output stream.  */
1224       if (!deps_file)
1225         deps_stream = out_stream;
1226       else
1227         {
1228           deps_stream = fopen (deps_file, deps_append ? "a": "w");
1229           if (!deps_stream)
1230             fatal_error ("opening dependency file %s: %m", deps_file);
1231         }
1232     }
1233
1234   /* For performance, avoid tearing down cpplib's internal structures
1235      with cpp_destroy ().  */
1236   errorcount += cpp_finish (parse_in, deps_stream);
1237
1238   if (deps_stream && deps_stream != out_stream
1239       && (ferror (deps_stream) || fclose (deps_stream)))
1240     fatal_error ("closing dependency file %s: %m", deps_file);
1241
1242   if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1243     fatal_error ("when writing output to %s: %m", out_fname);
1244 }
1245
1246 /* Either of two environment variables can specify output of
1247    dependencies.  Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1248    DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1249    and DEPS_TARGET is the target to mention in the deps.  They also
1250    result in dependency information being appended to the output file
1251    rather than overwriting it, and like Sun's compiler
1252    SUNPRO_DEPENDENCIES suppresses the dependency on the main file.  */
1253 static void
1254 check_deps_environment_vars (void)
1255 {
1256   char *spec;
1257
1258   GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1259   if (spec)
1260     cpp_opts->deps.style = DEPS_USER;
1261   else
1262     {
1263       GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1264       if (spec)
1265         {
1266           cpp_opts->deps.style = DEPS_SYSTEM;
1267           cpp_opts->deps.ignore_main_file = true;
1268         }
1269     }
1270
1271   if (spec)
1272     {
1273       /* Find the space before the DEPS_TARGET, if there is one.  */
1274       char *s = strchr (spec, ' ');
1275       if (s)
1276         {
1277           /* Let the caller perform MAKE quoting.  */
1278           defer_opt (OPT_MT, s + 1);
1279           *s = '\0';
1280         }
1281
1282       /* Command line -MF overrides environment variables and default.  */
1283       if (!deps_file)
1284         deps_file = spec;
1285
1286       deps_append = 1;
1287     }
1288 }
1289
1290 /* Handle deferred command line switches.  */
1291 static void
1292 handle_deferred_opts (void)
1293 {
1294   size_t i;
1295
1296   for (i = 0; i < deferred_count; i++)
1297     {
1298       struct deferred_opt *opt = &deferred_opts[i];
1299
1300       if (opt->code == OPT_MT || opt->code == OPT_MQ)
1301         cpp_add_dependency_target (parse_in, opt->arg, opt->code == OPT_MQ);
1302     }
1303 }
1304
1305 /* These settings are appropriate for GCC, but not necessarily so for
1306    cpplib as a library.  */
1307 static void
1308 sanitize_cpp_opts (void)
1309 {
1310   /* If we don't know what style of dependencies to output, complain
1311      if any other dependency switches have been given.  */
1312   if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1313     error ("to generate dependencies you must specify either -M or -MM");
1314
1315   /* -dM and dependencies suppress normal output; do it here so that
1316      the last -d[MDN] switch overrides earlier ones.  */
1317   if (flag_dump_macros == 'M')
1318     flag_no_output = 1;
1319
1320   /* Disable -dD, -dN and -dI if normal output is suppressed.  Allow
1321      -dM since at least glibc relies on -M -dM to work.  */
1322   if (flag_no_output)
1323     {
1324       if (flag_dump_macros != 'M')
1325         flag_dump_macros = 0;
1326       flag_dump_includes = 0;
1327     }
1328
1329   cpp_opts->unsigned_char = !flag_signed_char;
1330   cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1331
1332   /* We want -Wno-long-long to override -pedantic -std=non-c99
1333      and/or -Wtraditional, whatever the ordering.  */
1334   cpp_opts->warn_long_long
1335     = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1336
1337   /* If we're generating preprocessor output, emit current directory
1338      if explicitly requested or if debugging information is enabled.
1339      ??? Maybe we should only do it for debugging formats that
1340      actually output the current directory?  */
1341   if (flag_working_directory == -1)
1342     flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1343   cpp_opts->working_directory
1344     = flag_preprocess_only && flag_working_directory;
1345 }
1346
1347 /* Add include path with a prefix at the front of its name.  */
1348 static void
1349 add_prefixed_path (const char *suffix, size_t chain)
1350 {
1351   char *path;
1352   const char *prefix;
1353   size_t prefix_len, suffix_len;
1354
1355   suffix_len = strlen (suffix);
1356   prefix     = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1357   prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1358
1359   path = xmalloc (prefix_len + suffix_len + 1);
1360   memcpy (path, prefix, prefix_len);
1361   memcpy (path + prefix_len, suffix, suffix_len);
1362   path[prefix_len + suffix_len] = '\0';
1363
1364   add_path (path, chain, 0);
1365 }
1366
1367 /* Handle -D, -U, -A, -imacros, and the first -include.
1368    TIF is the input file to which we will return after processing all
1369    the includes.  */
1370 static void
1371 finish_options (const char *tif)
1372 {
1373   if (!cpp_opts->preprocessed)
1374     {
1375       size_t i;
1376
1377       cpp_change_file (parse_in, LC_RENAME, _("<built-in>"));
1378       cpp_init_builtins (parse_in, flag_hosted);
1379       c_cpp_builtins (parse_in);
1380
1381       /* We're about to send user input to cpplib, so make it warn for
1382          things that we previously (when we sent it internal definitions)
1383          told it to not warn.
1384
1385          C99 permits implementation-defined characters in identifiers.
1386          The documented meaning of -std= is to turn off extensions that
1387          conflict with the specified standard, and since a strictly
1388          conforming program cannot contain a '$', we do not condition
1389          their acceptance on the -std= setting.  */
1390       cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1391
1392       cpp_change_file (parse_in, LC_RENAME, _("<command line>"));
1393       for (i = 0; i < deferred_count; i++)
1394         {
1395           struct deferred_opt *opt = &deferred_opts[i];
1396
1397           if (opt->code == OPT_D)
1398             cpp_define (parse_in, opt->arg);
1399           else if (opt->code == OPT_U)
1400             cpp_undef (parse_in, opt->arg);
1401           else if (opt->code == OPT_A)
1402             {
1403               if (opt->arg[0] == '-')
1404                 cpp_unassert (parse_in, opt->arg + 1);
1405               else
1406                 cpp_assert (parse_in, opt->arg);
1407             }
1408         }
1409
1410       /* Handle -imacros after -D and -U.  */
1411       for (i = 0; i < deferred_count; i++)
1412         {
1413           struct deferred_opt *opt = &deferred_opts[i];
1414
1415           if (opt->code == OPT_imacros
1416               && cpp_push_include (parse_in, opt->arg))
1417             cpp_scan_nooutput (parse_in);
1418         }
1419     }
1420
1421   include_cursor = 0;
1422   this_input_filename = tif;
1423   push_command_line_include ();
1424 }
1425
1426 /* Give CPP the next file given by -include, if any.  */
1427 static void
1428 push_command_line_include (void)
1429 {
1430   if (cpp_opts->preprocessed)
1431     return;
1432
1433   while (include_cursor < deferred_count)
1434     {
1435       struct deferred_opt *opt = &deferred_opts[include_cursor++];
1436
1437       if (opt->code == OPT_include && cpp_push_include (parse_in, opt->arg))
1438         return;
1439     }
1440
1441   if (include_cursor == deferred_count)
1442     {
1443       /* Restore the line map from <command line>.  */
1444       cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1445       /* -Wunused-macros should only warn about macros defined hereafter.  */
1446       cpp_opts->warn_unused_macros = warn_unused_macros;
1447       include_cursor++;
1448     }
1449 }
1450
1451 /* File change callback.  Has to handle -include files.  */
1452 static void
1453 cb_file_change (cpp_reader *pfile ATTRIBUTE_UNUSED,
1454                 const struct line_map *new_map)
1455 {
1456   if (flag_preprocess_only)
1457     pp_file_change (new_map);
1458   else
1459     fe_file_change (new_map);
1460
1461   if (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map))
1462     push_command_line_include ();
1463 }
1464
1465 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1466    extensions if ISO).  There is no concept of gnu94.  */
1467 static void
1468 set_std_c89 (int c94, int iso)
1469 {
1470   cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1471   flag_iso = iso;
1472   flag_no_asm = iso;
1473   flag_no_gnu_keywords = iso;
1474   flag_no_nonansi_builtin = iso;
1475   flag_isoc94 = c94;
1476   flag_isoc99 = 0;
1477   flag_writable_strings = 0;
1478 }
1479
1480 /* Set the C 99 standard (without GNU extensions if ISO).  */
1481 static void
1482 set_std_c99 (int iso)
1483 {
1484   cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1485   flag_no_asm = iso;
1486   flag_no_nonansi_builtin = iso;
1487   flag_iso = iso;
1488   flag_isoc99 = 1;
1489   flag_isoc94 = 1;
1490   flag_writable_strings = 0;
1491 }
1492
1493 /* Set the C++ 98 standard (without GNU extensions if ISO).  */
1494 static void
1495 set_std_cxx98 (int iso)
1496 {
1497   cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1498   flag_no_gnu_keywords = iso;
1499   flag_no_nonansi_builtin = iso;
1500   flag_iso = iso;
1501 }
1502
1503 /* Handle setting implicit to ON.  */
1504 static void
1505 set_Wimplicit (int on)
1506 {
1507   warn_implicit = on;
1508   warn_implicit_int = on;
1509   if (on)
1510     {
1511       if (mesg_implicit_function_declaration != 2)
1512         mesg_implicit_function_declaration = 1;
1513     }
1514   else
1515     mesg_implicit_function_declaration = 0;
1516 }
1517
1518 /* Args to -d specify what to dump.  Silently ignore
1519    unrecognized options; they may be aimed at toplev.c.  */
1520 static void
1521 handle_OPT_d (const char *arg)
1522 {
1523   char c;
1524
1525   while ((c = *arg++) != '\0')
1526     switch (c)
1527       {
1528       case 'M':                 /* Dump macros only.  */
1529       case 'N':                 /* Dump names.  */
1530       case 'D':                 /* Dump definitions.  */
1531         flag_dump_macros = c;
1532         break;
1533
1534       case 'I':
1535         flag_dump_includes = 1;
1536         break;
1537       }
1538 }