c-opts.c revision 259405
1/* C/ObjC/C++ command line option handling. 2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 3 Free Software Foundation, Inc. 4 Contributed by Neil Booth. 5 6This file is part of GCC. 7 8GCC is free software; you can redistribute it and/or modify it under 9the terms of the GNU General Public License as published by the Free 10Software Foundation; either version 2, or (at your option) any later 11version. 12 13GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14WARRANTY; without even the implied warranty of MERCHANTABILITY or 15FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16for more details. 17 18You should have received a copy of the GNU General Public License 19along with GCC; see the file COPYING. If not, write to the Free 20Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 2102110-1301, USA. */ 22 23/* $FreeBSD: stable/10/contrib/gcc/c-opts.c 259405 2013-12-15 03:47:31Z pfg $ */ 24/* Merged C99 inline changes from gcc trunk 122565 2007-03-05 */ 25 26#include "config.h" 27#include "system.h" 28#include "coretypes.h" 29#include "tm.h" 30#include "tree.h" 31#include "c-common.h" 32#include "c-pragma.h" 33#include "flags.h" 34#include "toplev.h" 35#include "langhooks.h" 36#include "tree-inline.h" 37#include "diagnostic.h" 38#include "intl.h" 39#include "cppdefault.h" 40#include "c-incpath.h" 41#include "debug.h" /* For debug_hooks. */ 42#include "opts.h" 43#include "options.h" 44#include "mkdeps.h" 45 46#ifndef DOLLARS_IN_IDENTIFIERS 47# define DOLLARS_IN_IDENTIFIERS true 48#endif 49 50#ifndef TARGET_SYSTEM_ROOT 51# define TARGET_SYSTEM_ROOT NULL 52#endif 53 54#ifndef TARGET_OPTF 55#define TARGET_OPTF(ARG) 56#endif 57 58/* CPP's options. */ 59static cpp_options *cpp_opts; 60 61/* Input filename. */ 62static const char *this_input_filename; 63 64/* Filename and stream for preprocessed output. */ 65static const char *out_fname; 66static FILE *out_stream; 67 68/* Append dependencies to deps_file. */ 69static bool deps_append; 70 71/* If dependency switches (-MF etc.) have been given. */ 72static bool deps_seen; 73 74/* If -v seen. */ 75static bool verbose; 76 77/* If -lang-fortran seen. */ 78static bool lang_fortran = false; 79 80/* Dependency output file. */ 81static const char *deps_file; 82 83/* The prefix given by -iprefix, if any. */ 84static const char *iprefix; 85 86/* The multilib directory given by -imultilib, if any. */ 87static const char *imultilib; 88 89/* The system root, if any. Overridden by -isysroot. */ 90static const char *sysroot = TARGET_SYSTEM_ROOT; 91 92/* Zero disables all standard directories for headers. */ 93static bool std_inc = true; 94 95/* Zero disables the C++-specific standard directories for headers. */ 96static bool std_cxx_inc = true; 97 98/* If the quote chain has been split by -I-. */ 99static bool quote_chain_split; 100 101/* If -Wunused-macros. */ 102static bool warn_unused_macros; 103 104/* If -Wvariadic-macros. */ 105static bool warn_variadic_macros = true; 106 107/* Number of deferred options. */ 108static size_t deferred_count; 109 110/* Number of deferred options scanned for -include. */ 111static size_t include_cursor; 112 113static void set_Wimplicit (int); 114static void handle_OPT_d (const char *); 115static void set_std_cxx98 (int); 116static void set_std_c89 (int, int); 117static void set_std_c99 (int); 118static void check_deps_environment_vars (void); 119static void handle_deferred_opts (void); 120static void sanitize_cpp_opts (void); 121static void add_prefixed_path (const char *, size_t); 122static void push_command_line_include (void); 123static void cb_file_change (cpp_reader *, const struct line_map *); 124static void cb_dir_change (cpp_reader *, const char *); 125static void finish_options (void); 126 127#ifndef STDC_0_IN_SYSTEM_HEADERS 128#define STDC_0_IN_SYSTEM_HEADERS 0 129#endif 130 131/* Holds switches parsed by c_common_handle_option (), but whose 132 handling is deferred to c_common_post_options (). */ 133static void defer_opt (enum opt_code, const char *); 134static struct deferred_opt 135{ 136 enum opt_code code; 137 const char *arg; 138} *deferred_opts; 139 140/* Complain that switch CODE expects an argument but none was 141 provided. OPT was the command-line option. Return FALSE to get 142 the default message in opts.c, TRUE if we provide a specialized 143 one. */ 144bool 145c_common_missing_argument (const char *opt, size_t code) 146{ 147 switch (code) 148 { 149 default: 150 /* Pick up the default message. */ 151 return false; 152 153 case OPT_fconstant_string_class_: 154 error ("no class name specified with %qs", opt); 155 break; 156 157 case OPT_A: 158 error ("assertion missing after %qs", opt); 159 break; 160 161 case OPT_D: 162 case OPT_U: 163 error ("macro name missing after %qs", opt); 164 break; 165 166 case OPT_F: 167 case OPT_I: 168 case OPT_idirafter: 169 case OPT_isysroot: 170 case OPT_isystem: 171 case OPT_iquote: 172 error ("missing path after %qs", opt); 173 break; 174 175 case OPT_MF: 176 case OPT_MD: 177 case OPT_MMD: 178 case OPT_include: 179 case OPT_imacros: 180 case OPT_o: 181 error ("missing filename after %qs", opt); 182 break; 183 184 case OPT_MQ: 185 case OPT_MT: 186 error ("missing makefile target after %qs", opt); 187 break; 188 } 189 190 return true; 191} 192 193/* Defer option CODE with argument ARG. */ 194static void 195defer_opt (enum opt_code code, const char *arg) 196{ 197 deferred_opts[deferred_count].code = code; 198 deferred_opts[deferred_count].arg = arg; 199 deferred_count++; 200} 201 202/* Common initialization before parsing options. */ 203unsigned int 204c_common_init_options (unsigned int argc, const char **argv) 205{ 206 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX}; 207 unsigned int i, result; 208 209 /* This is conditionalized only because that is the way the front 210 ends used to do it. Maybe this should be unconditional? */ 211 if (c_dialect_cxx ()) 212 { 213 /* By default wrap lines at 80 characters. Is getenv 214 ("COLUMNS") preferable? */ 215 diagnostic_line_cutoff (global_dc) = 80; 216 /* By default, emit location information once for every 217 diagnostic message. */ 218 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE; 219 } 220 221 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89, 222 ident_hash, &line_table); 223 224 cpp_opts = cpp_get_options (parse_in); 225 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS; 226 cpp_opts->objc = c_dialect_objc (); 227 228 /* Reset to avoid warnings on internal definitions. We set it just 229 before passing on command-line options to cpplib. */ 230 cpp_opts->warn_dollars = 0; 231 232 flag_exceptions = c_dialect_cxx (); 233 warn_pointer_arith = c_dialect_cxx (); 234 warn_write_strings = c_dialect_cxx(); 235 236 deferred_opts = XNEWVEC (struct deferred_opt, argc); 237 238 result = lang_flags[c_language]; 239 240 if (c_language == clk_c) 241 { 242 /* If preprocessing assembly language, accept any of the C-family 243 front end options since the driver may pass them through. */ 244 for (i = 1; i < argc; i++) 245 if (! strcmp (argv[i], "-lang-asm")) 246 { 247 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX; 248 break; 249 } 250 251#ifdef CL_Fortran 252 for (i = 1; i < argc; i++) 253 if (! strcmp (argv[i], "-lang-fortran")) 254 { 255 result |= CL_Fortran; 256 break; 257 } 258#endif 259 } 260 261 return result; 262} 263 264/* Handle switch SCODE with argument ARG. VALUE is true, unless no- 265 form of an -f or -W option was given. Returns 0 if the switch was 266 invalid, a negative number to prevent language-independent 267 processing in toplev.c (a hack necessary for the short-term). */ 268int 269c_common_handle_option (size_t scode, const char *arg, int value) 270{ 271 const struct cl_option *option = &cl_options[scode]; 272 enum opt_code code = (enum opt_code) scode; 273 int result = 1; 274 275 /* Prevent resetting the language standard to a C dialect when the driver 276 has already determined that we're looking at assembler input. */ 277 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM); 278 279 switch (code) 280 { 281 default: 282 if (cl_options[code].flags & (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX)) 283 break; 284#ifdef CL_Fortran 285 if (lang_fortran && (cl_options[code].flags & (CL_Fortran))) 286 break; 287#endif 288 result = 0; 289 break; 290 291 case OPT__output_pch_: 292 pch_file = arg; 293 break; 294 295 case OPT_A: 296 defer_opt (code, arg); 297 break; 298 299 case OPT_C: 300 cpp_opts->discard_comments = 0; 301 break; 302 303 case OPT_CC: 304 cpp_opts->discard_comments = 0; 305 cpp_opts->discard_comments_in_macro_exp = 0; 306 break; 307 308 case OPT_D: 309 defer_opt (code, arg); 310 break; 311 312 case OPT_E: 313 flag_preprocess_only = 1; 314 break; 315 316 case OPT_H: 317 cpp_opts->print_include_names = 1; 318 break; 319 320 case OPT_F: 321 TARGET_OPTF (xstrdup (arg)); 322 break; 323 324 case OPT_I: 325 if (strcmp (arg, "-")) 326 add_path (xstrdup (arg), BRACKET, 0, true); 327 else 328 { 329 if (quote_chain_split) 330 error ("-I- specified twice"); 331 quote_chain_split = true; 332 split_quote_chain (); 333 inform ("obsolete option -I- used, please use -iquote instead"); 334 } 335 break; 336 337 case OPT_M: 338 case OPT_MM: 339 /* When doing dependencies with -M or -MM, suppress normal 340 preprocessed output, but still do -dM etc. as software 341 depends on this. Preprocessed output does occur if -MD, -MMD 342 or environment var dependency generation is used. */ 343 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER); 344 flag_no_output = 1; 345 cpp_opts->inhibit_warnings = 1; 346 break; 347 348 case OPT_MD: 349 case OPT_MMD: 350 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER); 351 deps_file = arg; 352 break; 353 354 case OPT_MF: 355 deps_seen = true; 356 deps_file = arg; 357 break; 358 359 case OPT_MG: 360 deps_seen = true; 361 cpp_opts->deps.missing_files = true; 362 break; 363 364 case OPT_MP: 365 deps_seen = true; 366 cpp_opts->deps.phony_targets = true; 367 break; 368 369 case OPT_MQ: 370 case OPT_MT: 371 deps_seen = true; 372 defer_opt (code, arg); 373 break; 374 375 case OPT_P: 376 flag_no_line_commands = 1; 377 break; 378 379 case OPT_fworking_directory: 380 flag_working_directory = value; 381 break; 382 383 case OPT_U: 384 defer_opt (code, arg); 385 break; 386 387 case OPT_Wall: 388 set_Wunused (value); 389 set_Wformat (value); 390 set_Wimplicit (value); 391 warn_char_subscripts = value; 392 warn_missing_braces = value; 393 warn_parentheses = value; 394 warn_return_type = value; 395 warn_sequence_point = value; /* Was C only. */ 396 if (c_dialect_cxx ()) 397 warn_sign_compare = value; 398 warn_switch = value; 399 set_warn_strict_aliasing (value); 400 warn_strict_overflow = value; 401 warn_address = value; 402 403 /* Only warn about unknown pragmas that are not in system 404 headers. */ 405 warn_unknown_pragmas = value; 406 407 /* We save the value of warn_uninitialized, since if they put 408 -Wuninitialized on the command line, we need to generate a 409 warning about not using it without also specifying -O. */ 410 if (warn_uninitialized != 1) 411 warn_uninitialized = (value ? 2 : 0); 412 413 if (!c_dialect_cxx ()) 414 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding 415 can turn it off only if it's not explicit. */ 416 warn_main = value * 2; 417 else 418 { 419 /* C++-specific warnings. */ 420 warn_reorder = value; 421 warn_nontemplate_friend = value; 422 } 423 424 cpp_opts->warn_trigraphs = value; 425 cpp_opts->warn_comments = value; 426 cpp_opts->warn_num_sign_change = value; 427 cpp_opts->warn_multichar = value; /* Was C++ only. */ 428 429 if (warn_pointer_sign == -1) 430 warn_pointer_sign = 1; 431 break; 432 433 case OPT_Wcomment: 434 case OPT_Wcomments: 435 cpp_opts->warn_comments = value; 436 break; 437 438 case OPT_Wdeprecated: 439 cpp_opts->warn_deprecated = value; 440 break; 441 442 case OPT_Wendif_labels: 443 cpp_opts->warn_endif_labels = value; 444 break; 445 446 case OPT_Werror: 447 cpp_opts->warnings_are_errors = value; 448 global_dc->warning_as_error_requested = value; 449 break; 450 451 case OPT_Werror_implicit_function_declaration: 452 mesg_implicit_function_declaration = 2; 453 break; 454 455 case OPT_Wformat: 456 set_Wformat (value); 457 break; 458 459 case OPT_Wformat_: 460 set_Wformat (atoi (arg)); 461 break; 462 463 case OPT_Wimplicit: 464 set_Wimplicit (value); 465 break; 466 467 case OPT_Wimport: 468 /* Silently ignore for now. */ 469 break; 470 471 case OPT_Winvalid_pch: 472 cpp_opts->warn_invalid_pch = value; 473 break; 474 475 case OPT_Wmain: 476 if (value) 477 warn_main = 1; 478 else 479 warn_main = -1; 480 break; 481 482 case OPT_Wmissing_include_dirs: 483 cpp_opts->warn_missing_include_dirs = value; 484 break; 485 486 case OPT_Wmultichar: 487 cpp_opts->warn_multichar = value; 488 break; 489 490 case OPT_Wnormalized_: 491 if (!value || (arg && strcasecmp (arg, "none") == 0)) 492 cpp_opts->warn_normalize = normalized_none; 493 else if (!arg || strcasecmp (arg, "nfkc") == 0) 494 cpp_opts->warn_normalize = normalized_KC; 495 else if (strcasecmp (arg, "id") == 0) 496 cpp_opts->warn_normalize = normalized_identifier_C; 497 else if (strcasecmp (arg, "nfc") == 0) 498 cpp_opts->warn_normalize = normalized_C; 499 else 500 error ("argument %qs to %<-Wnormalized%> not recognized", arg); 501 break; 502 503 case OPT_Wreturn_type: 504 warn_return_type = value; 505 break; 506 507 case OPT_Wstrict_null_sentinel: 508 warn_strict_null_sentinel = value; 509 break; 510 511 case OPT_Wsystem_headers: 512 cpp_opts->warn_system_headers = value; 513 break; 514 515 case OPT_Wtraditional: 516 cpp_opts->warn_traditional = value; 517 break; 518 519 case OPT_Wtrigraphs: 520 cpp_opts->warn_trigraphs = value; 521 break; 522 523 case OPT_Wundef: 524 cpp_opts->warn_undef = value; 525 break; 526 527 case OPT_Wunknown_pragmas: 528 /* Set to greater than 1, so that even unknown pragmas in 529 system headers will be warned about. */ 530 warn_unknown_pragmas = value * 2; 531 break; 532 533 case OPT_Wunused_macros: 534 warn_unused_macros = value; 535 break; 536 537 case OPT_Wvariadic_macros: 538 warn_variadic_macros = value; 539 break; 540 541 case OPT_Wwrite_strings: 542 warn_write_strings = value; 543 break; 544 545 case OPT_Weffc__: 546 warn_ecpp = value; 547 if (value) 548 warn_nonvdtor = true; 549 break; 550 551 case OPT_ansi: 552 if (!c_dialect_cxx ()) 553 set_std_c89 (false, true); 554 else 555 set_std_cxx98 (true); 556 break; 557 558 case OPT_d: 559 handle_OPT_d (arg); 560 break; 561 562 case OPT_fcond_mismatch: 563 if (!c_dialect_cxx ()) 564 { 565 flag_cond_mismatch = value; 566 break; 567 } 568 /* Fall through. */ 569 570 case OPT_fall_virtual: 571 case OPT_falt_external_templates: 572 case OPT_fenum_int_equiv: 573 case OPT_fexternal_templates: 574 case OPT_fguiding_decls: 575 case OPT_fhonor_std: 576 case OPT_fhuge_objects: 577 case OPT_flabels_ok: 578 case OPT_fname_mangling_version_: 579 case OPT_fnew_abi: 580 case OPT_fnonnull_objects: 581 case OPT_fsquangle: 582 case OPT_fstrict_prototype: 583 case OPT_fthis_is_variable: 584 case OPT_fvtable_thunks: 585 case OPT_fxref: 586 case OPT_fvtable_gc: 587 warning (0, "switch %qs is no longer supported", option->opt_text); 588 break; 589 590 case OPT_faccess_control: 591 flag_access_control = value; 592 break; 593 594 case OPT_fasm: 595 flag_no_asm = !value; 596 break; 597 598 case OPT_fbuiltin: 599 flag_no_builtin = !value; 600 break; 601 602 case OPT_fbuiltin_: 603 if (value) 604 result = 0; 605 else 606 disable_builtin_function (arg); 607 break; 608 609 case OPT_fdirectives_only: 610 cpp_opts->directives_only = 1; 611 break; 612 613 case OPT_fdollars_in_identifiers: 614 cpp_opts->dollars_in_ident = value; 615 break; 616 617 case OPT_ffreestanding: 618 value = !value; 619 /* Fall through.... */ 620 case OPT_fhosted: 621 flag_hosted = value; 622 flag_no_builtin = !value; 623 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */ 624 if (!value && warn_main == 2) 625 warn_main = 0; 626 break; 627 628 case OPT_fshort_double: 629 flag_short_double = value; 630 break; 631 632 case OPT_fshort_enums: 633 flag_short_enums = value; 634 break; 635 636 case OPT_fshort_wchar: 637 flag_short_wchar = value; 638 break; 639 640 case OPT_fsigned_bitfields: 641 flag_signed_bitfields = value; 642 break; 643 644 case OPT_fsigned_char: 645 flag_signed_char = value; 646 break; 647 648 case OPT_funsigned_bitfields: 649 flag_signed_bitfields = !value; 650 break; 651 652 case OPT_funsigned_char: 653 flag_signed_char = !value; 654 break; 655 656 case OPT_fcheck_new: 657 flag_check_new = value; 658 break; 659 660 case OPT_fconserve_space: 661 flag_conserve_space = value; 662 break; 663 664 case OPT_fconstant_string_class_: 665 constant_string_class_name = arg; 666 break; 667 668 case OPT_fdefault_inline: 669 flag_default_inline = value; 670 break; 671 672 case OPT_felide_constructors: 673 flag_elide_constructors = value; 674 break; 675 676 case OPT_fenforce_eh_specs: 677 flag_enforce_eh_specs = value; 678 break; 679 680 case OPT_fextended_identifiers: 681 cpp_opts->extended_identifiers = value; 682 break; 683 684 case OPT_ffor_scope: 685 flag_new_for_scope = value; 686 break; 687 688 case OPT_fgnu_keywords: 689 flag_no_gnu_keywords = !value; 690 break; 691 692 case OPT_fgnu_runtime: 693 flag_next_runtime = !value; 694 break; 695 696 case OPT_fhandle_exceptions: 697 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)"); 698 flag_exceptions = value; 699 break; 700 701 case OPT_fimplement_inlines: 702 flag_implement_inlines = value; 703 break; 704 705 case OPT_fimplicit_inline_templates: 706 flag_implicit_inline_templates = value; 707 break; 708 709 case OPT_fimplicit_templates: 710 flag_implicit_templates = value; 711 break; 712 713 case OPT_fms_extensions: 714 flag_ms_extensions = value; 715 break; 716 717 case OPT_fnext_runtime: 718 flag_next_runtime = value; 719 break; 720 721 case OPT_fnil_receivers: 722 flag_nil_receivers = value; 723 break; 724 725 case OPT_fnonansi_builtins: 726 flag_no_nonansi_builtin = !value; 727 break; 728 729 case OPT_foperator_names: 730 cpp_opts->operator_names = value; 731 break; 732 733 case OPT_foptional_diags: 734 flag_optional_diags = value; 735 break; 736 737 case OPT_fpch_deps: 738 cpp_opts->restore_pch_deps = value; 739 break; 740 741 case OPT_fpch_preprocess: 742 flag_pch_preprocess = value; 743 break; 744 745 case OPT_fpermissive: 746 flag_permissive = value; 747 break; 748 749 case OPT_fpreprocessed: 750 cpp_opts->preprocessed = value; 751 break; 752 753 case OPT_freplace_objc_classes: 754 flag_replace_objc_classes = value; 755 break; 756 757 case OPT_frepo: 758 flag_use_repository = value; 759 if (value) 760 flag_implicit_templates = 0; 761 break; 762 763 case OPT_frtti: 764 flag_rtti = value; 765 break; 766 767 case OPT_fshow_column: 768 cpp_opts->show_column = value; 769 break; 770 771 case OPT_fstats: 772 flag_detailed_statistics = value; 773 break; 774 775 case OPT_ftabstop_: 776 /* It is documented that we silently ignore silly values. */ 777 if (value >= 1 && value <= 100) 778 cpp_opts->tabstop = value; 779 break; 780 781 case OPT_fexec_charset_: 782 cpp_opts->narrow_charset = arg; 783 break; 784 785 case OPT_fwide_exec_charset_: 786 cpp_opts->wide_charset = arg; 787 break; 788 789 case OPT_finput_charset_: 790 cpp_opts->input_charset = arg; 791 break; 792 793 case OPT_ftemplate_depth_: 794 max_tinst_depth = value; 795 break; 796 797 case OPT_fuse_cxa_atexit: 798 flag_use_cxa_atexit = value; 799 break; 800 801 case OPT_fuse_cxa_get_exception_ptr: 802 flag_use_cxa_get_exception_ptr = value; 803 break; 804 805 case OPT_fvisibility_inlines_hidden: 806 visibility_options.inlines_hidden = value; 807 break; 808 809 case OPT_fweak: 810 flag_weak = value; 811 break; 812 813 case OPT_fthreadsafe_statics: 814 flag_threadsafe_statics = value; 815 break; 816 817 case OPT_fzero_link: 818 flag_zero_link = value; 819 break; 820 821 case OPT_gen_decls: 822 flag_gen_declaration = 1; 823 break; 824 825 case OPT_femit_struct_debug_baseonly: 826 set_struct_debug_option ("base"); 827 break; 828 829 case OPT_femit_struct_debug_reduced: 830 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base"); 831 break; 832 833 case OPT_femit_struct_debug_detailed_: 834 set_struct_debug_option (arg); 835 break; 836 837 case OPT_idirafter: 838 add_path (xstrdup (arg), AFTER, 0, true); 839 break; 840 841 case OPT_imacros: 842 case OPT_include: 843 defer_opt (code, arg); 844 break; 845 846 case OPT_imultilib: 847 imultilib = arg; 848 break; 849 850 case OPT_iprefix: 851 iprefix = arg; 852 break; 853 854 case OPT_iquote: 855 add_path (xstrdup (arg), QUOTE, 0, true); 856 break; 857 858 case OPT_isysroot: 859 sysroot = arg; 860 break; 861 862 case OPT_isystem: 863 add_path (xstrdup (arg), SYSTEM, 0, true); 864 break; 865 866 case OPT_iwithprefix: 867 add_prefixed_path (arg, SYSTEM); 868 break; 869 870 case OPT_iwithprefixbefore: 871 add_prefixed_path (arg, BRACKET); 872 break; 873 874 case OPT_lang_asm: 875 cpp_set_lang (parse_in, CLK_ASM); 876 cpp_opts->dollars_in_ident = false; 877 break; 878 879 case OPT_lang_fortran: 880 lang_fortran = true; 881 break; 882 883 case OPT_lang_objc: 884 cpp_opts->objc = 1; 885 break; 886 887 case OPT_nostdinc: 888 std_inc = false; 889 break; 890 891 case OPT_nostdinc__: 892 std_cxx_inc = false; 893 break; 894 895 case OPT_o: 896 if (!out_fname) 897 out_fname = arg; 898 else 899 error ("output filename specified twice"); 900 break; 901 902 /* We need to handle the -pedantic switches here, rather than in 903 c_common_post_options, so that a subsequent -Wno-endif-labels 904 is not overridden. */ 905 case OPT_pedantic_errors: 906 cpp_opts->pedantic_errors = 1; 907 /* Fall through. */ 908 case OPT_pedantic: 909 cpp_opts->pedantic = 1; 910 cpp_opts->warn_endif_labels = 1; 911 if (warn_pointer_sign == -1) 912 warn_pointer_sign = 1; 913 if (warn_overlength_strings == -1) 914 warn_overlength_strings = 1; 915 break; 916 917 case OPT_print_objc_runtime_info: 918 print_struct_values = 1; 919 break; 920 921 case OPT_print_pch_checksum: 922 c_common_print_pch_checksum (stdout); 923 exit_after_options = true; 924 break; 925 926 case OPT_remap: 927 cpp_opts->remap = 1; 928 break; 929 930 case OPT_std_c__98: 931 case OPT_std_gnu__98: 932 if (!preprocessing_asm_p) 933 set_std_cxx98 (code == OPT_std_c__98 /* ISO */); 934 break; 935 936 case OPT_std_c89: 937 case OPT_std_iso9899_1990: 938 case OPT_std_iso9899_199409: 939 if (!preprocessing_asm_p) 940 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */); 941 break; 942 943 case OPT_std_gnu89: 944 if (!preprocessing_asm_p) 945 set_std_c89 (false /* c94 */, false /* ISO */); 946 break; 947 948 case OPT_std_c99: 949 case OPT_std_c9x: 950 case OPT_std_iso9899_1999: 951 case OPT_std_iso9899_199x: 952 if (!preprocessing_asm_p) 953 set_std_c99 (true /* ISO */); 954 break; 955 956 case OPT_std_gnu99: 957 case OPT_std_gnu9x: 958 if (!preprocessing_asm_p) 959 set_std_c99 (false /* ISO */); 960 break; 961 962 case OPT_trigraphs: 963 cpp_opts->trigraphs = 1; 964 break; 965 966 case OPT_traditional_cpp: 967 cpp_opts->traditional = 1; 968 break; 969 970 case OPT_undef: 971 flag_undef = 1; 972 break; 973 974 case OPT_w: 975 cpp_opts->inhibit_warnings = 1; 976 break; 977 978 case OPT_v: 979 verbose = true; 980 break; 981 } 982 983 return result; 984} 985 986/* Post-switch processing. */ 987bool 988c_common_post_options (const char **pfilename) 989{ 990 struct cpp_callbacks *cb; 991 992 /* Canonicalize the input and output filenames. */ 993 if (in_fnames == NULL) 994 { 995 in_fnames = XNEWVEC (const char *, 1); 996 in_fnames[0] = ""; 997 } 998 else if (strcmp (in_fnames[0], "-") == 0) 999 in_fnames[0] = ""; 1000 1001 if (out_fname == NULL || !strcmp (out_fname, "-")) 1002 out_fname = ""; 1003 1004 if (cpp_opts->deps.style == DEPS_NONE) 1005 check_deps_environment_vars (); 1006 1007 handle_deferred_opts (); 1008 1009 sanitize_cpp_opts (); 1010 1011 register_include_chains (parse_in, sysroot, iprefix, imultilib, 1012 std_inc, std_cxx_inc && c_dialect_cxx (), verbose); 1013 1014#ifdef C_COMMON_OVERRIDE_OPTIONS 1015 /* Some machines may reject certain combinations of C 1016 language-specific options. */ 1017 C_COMMON_OVERRIDE_OPTIONS; 1018#endif 1019 1020 flag_inline_trees = 1; 1021 1022 /* Use tree inlining. */ 1023 if (!flag_no_inline) 1024 flag_no_inline = 1; 1025 if (flag_inline_functions) 1026 flag_inline_trees = 2; 1027 1028 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99 1029 inline semantics are not supported in GNU89 or C89 mode. */ 1030 if (flag_gnu89_inline == -1) 1031 flag_gnu89_inline = !flag_isoc99; 1032 else if (!flag_gnu89_inline && !flag_isoc99) 1033 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode"); 1034 1035 /* If we are given more than one input file, we must use 1036 unit-at-a-time mode. */ 1037 if (num_in_fnames > 1) 1038 flag_unit_at_a_time = 1; 1039 1040 /* Default to ObjC sjlj exception handling if NeXT runtime. */ 1041 if (flag_objc_sjlj_exceptions < 0) 1042 flag_objc_sjlj_exceptions = flag_next_runtime; 1043 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions) 1044 flag_exceptions = 1; 1045 1046 /* -Wextra implies -Wsign-compare, -Wmissing-field-initializers and 1047 -Woverride-init, but not if explicitly overridden. */ 1048 if (warn_sign_compare == -1) 1049 warn_sign_compare = extra_warnings; 1050 if (warn_missing_field_initializers == -1) 1051 warn_missing_field_initializers = extra_warnings; 1052 if (warn_override_init == -1) 1053 warn_override_init = extra_warnings; 1054 1055 /* -Wpointer_sign is disabled by default, but it is enabled if any 1056 of -Wall or -pedantic are given. */ 1057 if (warn_pointer_sign == -1) 1058 warn_pointer_sign = 0; 1059 1060 /* -Woverlength-strings is off by default, but is enabled by -pedantic. 1061 It is never enabled in C++, as the minimum limit is not normative 1062 in that standard. */ 1063 if (warn_overlength_strings == -1 || c_dialect_cxx ()) 1064 warn_overlength_strings = 0; 1065 1066 /* Special format checking options don't work without -Wformat; warn if 1067 they are used. */ 1068 if (!warn_format) 1069 { 1070 warning (OPT_Wformat_y2k, 1071 "-Wformat-y2k ignored without -Wformat"); 1072 warning (OPT_Wformat_extra_args, 1073 "-Wformat-extra-args ignored without -Wformat"); 1074 warning (OPT_Wformat_zero_length, 1075 "-Wformat-zero-length ignored without -Wformat"); 1076 warning (OPT_Wformat_nonliteral, 1077 "-Wformat-nonliteral ignored without -Wformat"); 1078 warning (OPT_Wformat_security, 1079 "-Wformat-security ignored without -Wformat"); 1080 } 1081 1082 /* C99 requires special handling of complex multiplication and division; 1083 -ffast-math and -fcx-limited-range are handled in process_options. */ 1084 if (flag_isoc99) 1085 flag_complex_method = 2; 1086 1087 if (flag_preprocess_only) 1088 { 1089 /* Open the output now. We must do so even if flag_no_output is 1090 on, because there may be other output than from the actual 1091 preprocessing (e.g. from -dM). */ 1092 if (out_fname[0] == '\0') 1093 out_stream = stdout; 1094 else 1095 out_stream = fopen (out_fname, "w"); 1096 1097 if (out_stream == NULL) 1098 { 1099 fatal_error ("opening output file %s: %m", out_fname); 1100 return false; 1101 } 1102 1103 if (num_in_fnames > 1) 1104 error ("too many filenames given. Type %s --help for usage", 1105 progname); 1106 1107 init_pp_output (out_stream); 1108 } 1109 else 1110 { 1111 init_c_lex (); 1112 1113 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */ 1114 input_location = UNKNOWN_LOCATION; 1115 } 1116 1117 cb = cpp_get_callbacks (parse_in); 1118 cb->file_change = cb_file_change; 1119 cb->dir_change = cb_dir_change; 1120 cpp_post_options (parse_in); 1121 1122 input_location = UNKNOWN_LOCATION; 1123 1124 /* If an error has occurred in cpplib, note it so we fail 1125 immediately. */ 1126 errorcount += cpp_errors (parse_in); 1127 1128 *pfilename = this_input_filename 1129 = cpp_read_main_file (parse_in, in_fnames[0]); 1130 /* Don't do any compilation or preprocessing if there is no input file. */ 1131 if (this_input_filename == NULL) 1132 { 1133 errorcount++; 1134 return false; 1135 } 1136 1137 if (flag_working_directory 1138 && flag_preprocess_only && !flag_no_line_commands) 1139 pp_dir_change (parse_in, get_src_pwd ()); 1140 1141 return flag_preprocess_only; 1142} 1143 1144/* Front end initialization common to C, ObjC and C++. */ 1145bool 1146c_common_init (void) 1147{ 1148 /* Set up preprocessor arithmetic. Must be done after call to 1149 c_common_nodes_and_builtins for type nodes to be good. */ 1150 cpp_opts->precision = TYPE_PRECISION (intmax_type_node); 1151 cpp_opts->char_precision = TYPE_PRECISION (char_type_node); 1152 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node); 1153 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node); 1154 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node); 1155 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN; 1156 1157 /* This can't happen until after wchar_precision and bytes_big_endian 1158 are known. */ 1159 cpp_init_iconv (parse_in); 1160 1161 if (version_flag) 1162 c_common_print_pch_checksum (stderr); 1163 1164 if (flag_preprocess_only) 1165 { 1166 finish_options (); 1167 preprocess_file (parse_in); 1168 return false; 1169 } 1170 1171 /* Has to wait until now so that cpplib has its hash table. */ 1172 init_pragma (); 1173 1174 return true; 1175} 1176 1177/* Initialize the integrated preprocessor after debug output has been 1178 initialized; loop over each input file. */ 1179void 1180c_common_parse_file (int set_yydebug) 1181{ 1182 unsigned int i; 1183 1184 /* Enable parser debugging, if requested and we can. If requested 1185 and we can't, notify the user. */ 1186#if YYDEBUG != 0 1187 yydebug = set_yydebug; 1188#else 1189 if (set_yydebug) 1190 warning (0, "YYDEBUG was not defined at build time, -dy ignored"); 1191#endif 1192 1193 i = 0; 1194 for (;;) 1195 { 1196 /* Start the main input file, if the debug writer wants it. */ 1197 if (debug_hooks->start_end_main_source_file) 1198 (*debug_hooks->start_source_file) (0, this_input_filename); 1199 finish_options (); 1200 pch_init (); 1201 push_file_scope (); 1202 c_parse_file (); 1203 finish_file (); 1204 pop_file_scope (); 1205 /* And end the main input file, if the debug writer wants it */ 1206 if (debug_hooks->start_end_main_source_file) 1207 (*debug_hooks->end_source_file) (0); 1208 if (++i >= num_in_fnames) 1209 break; 1210 cpp_undef_all (parse_in); 1211 this_input_filename 1212 = cpp_read_main_file (parse_in, in_fnames[i]); 1213 /* If an input file is missing, abandon further compilation. 1214 cpplib has issued a diagnostic. */ 1215 if (!this_input_filename) 1216 break; 1217 } 1218} 1219 1220/* Common finish hook for the C, ObjC and C++ front ends. */ 1221void 1222c_common_finish (void) 1223{ 1224 FILE *deps_stream = NULL; 1225 1226 if (cpp_opts->deps.style != DEPS_NONE) 1227 { 1228 /* If -M or -MM was seen without -MF, default output to the 1229 output stream. */ 1230 if (!deps_file) 1231 deps_stream = out_stream; 1232 else 1233 { 1234 deps_stream = fopen (deps_file, deps_append ? "a": "w"); 1235 if (!deps_stream) 1236 fatal_error ("opening dependency file %s: %m", deps_file); 1237 } 1238 } 1239 1240 /* For performance, avoid tearing down cpplib's internal structures 1241 with cpp_destroy (). */ 1242 errorcount += cpp_finish (parse_in, deps_stream); 1243 1244 if (deps_stream && deps_stream != out_stream 1245 && (ferror (deps_stream) || fclose (deps_stream))) 1246 fatal_error ("closing dependency file %s: %m", deps_file); 1247 1248 if (out_stream && (ferror (out_stream) || fclose (out_stream))) 1249 fatal_error ("when writing output to %s: %m", out_fname); 1250} 1251 1252/* Either of two environment variables can specify output of 1253 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE 1254 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to 1255 and DEPS_TARGET is the target to mention in the deps. They also 1256 result in dependency information being appended to the output file 1257 rather than overwriting it, and like Sun's compiler 1258 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */ 1259static void 1260check_deps_environment_vars (void) 1261{ 1262 char *spec; 1263 1264 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT"); 1265 if (spec) 1266 cpp_opts->deps.style = DEPS_USER; 1267 else 1268 { 1269 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES"); 1270 if (spec) 1271 { 1272 cpp_opts->deps.style = DEPS_SYSTEM; 1273 cpp_opts->deps.ignore_main_file = true; 1274 } 1275 } 1276 1277 if (spec) 1278 { 1279 /* Find the space before the DEPS_TARGET, if there is one. */ 1280 char *s = strchr (spec, ' '); 1281 if (s) 1282 { 1283 /* Let the caller perform MAKE quoting. */ 1284 defer_opt (OPT_MT, s + 1); 1285 *s = '\0'; 1286 } 1287 1288 /* Command line -MF overrides environment variables and default. */ 1289 if (!deps_file) 1290 deps_file = spec; 1291 1292 deps_append = 1; 1293 deps_seen = true; 1294 } 1295} 1296 1297/* Handle deferred command line switches. */ 1298static void 1299handle_deferred_opts (void) 1300{ 1301 size_t i; 1302 struct deps *deps; 1303 1304 /* Avoid allocating the deps buffer if we don't need it. 1305 (This flag may be true without there having been -MT or -MQ 1306 options, but we'll still need the deps buffer.) */ 1307 if (!deps_seen) 1308 return; 1309 1310 deps = cpp_get_deps (parse_in); 1311 1312 for (i = 0; i < deferred_count; i++) 1313 { 1314 struct deferred_opt *opt = &deferred_opts[i]; 1315 1316 if (opt->code == OPT_MT || opt->code == OPT_MQ) 1317 deps_add_target (deps, opt->arg, opt->code == OPT_MQ); 1318 } 1319} 1320 1321/* These settings are appropriate for GCC, but not necessarily so for 1322 cpplib as a library. */ 1323static void 1324sanitize_cpp_opts (void) 1325{ 1326 /* If we don't know what style of dependencies to output, complain 1327 if any other dependency switches have been given. */ 1328 if (deps_seen && cpp_opts->deps.style == DEPS_NONE) 1329 error ("to generate dependencies you must specify either -M or -MM"); 1330 1331 /* -dM and dependencies suppress normal output; do it here so that 1332 the last -d[MDN] switch overrides earlier ones. */ 1333 if (flag_dump_macros == 'M') 1334 flag_no_output = 1; 1335 1336 /* By default, -fdirectives-only implies -dD. This allows subsequent phases 1337 to perform proper macro expansion. */ 1338 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros) 1339 flag_dump_macros = 'D'; 1340 1341 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow 1342 -dM since at least glibc relies on -M -dM to work. */ 1343 /* Also, flag_no_output implies flag_no_line_commands, always. */ 1344 if (flag_no_output) 1345 { 1346 if (flag_dump_macros != 'M') 1347 flag_dump_macros = 0; 1348 flag_dump_includes = 0; 1349 flag_no_line_commands = 1; 1350 } 1351 1352 cpp_opts->unsigned_char = !flag_signed_char; 1353 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS; 1354 1355 /* We want -Wno-long-long to override -pedantic -std=non-c99 1356 and/or -Wtraditional, whatever the ordering. */ 1357 cpp_opts->warn_long_long 1358 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional); 1359 1360 /* Similarly with -Wno-variadic-macros. No check for c99 here, since 1361 this also turns off warnings about GCCs extension. */ 1362 cpp_opts->warn_variadic_macros 1363 = warn_variadic_macros && (pedantic || warn_traditional); 1364 1365 /* If we're generating preprocessor output, emit current directory 1366 if explicitly requested or if debugging information is enabled. 1367 ??? Maybe we should only do it for debugging formats that 1368 actually output the current directory? */ 1369 if (flag_working_directory == -1) 1370 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE); 1371 1372 if (cpp_opts->directives_only) 1373 { 1374 if (warn_unused_macros) 1375 error ("-fdirectives-only is incompatible with -Wunused_macros"); 1376 if (cpp_opts->traditional) 1377 error ("-fdirectives-only is incompatible with -traditional"); 1378 } 1379} 1380 1381/* Add include path with a prefix at the front of its name. */ 1382static void 1383add_prefixed_path (const char *suffix, size_t chain) 1384{ 1385 char *path; 1386 const char *prefix; 1387 size_t prefix_len, suffix_len; 1388 1389 suffix_len = strlen (suffix); 1390 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR; 1391 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len; 1392 1393 path = (char *) xmalloc (prefix_len + suffix_len + 1); 1394 memcpy (path, prefix, prefix_len); 1395 memcpy (path + prefix_len, suffix, suffix_len); 1396 path[prefix_len + suffix_len] = '\0'; 1397 1398 add_path (path, chain, 0, false); 1399} 1400 1401/* Handle -D, -U, -A, -imacros, and the first -include. */ 1402static void 1403finish_options (void) 1404{ 1405 if (!cpp_opts->preprocessed) 1406 { 1407 size_t i; 1408 1409 cb_file_change (parse_in, 1410 linemap_add (&line_table, LC_RENAME, 0, 1411 _("<built-in>"), 0)); 1412 1413 cpp_init_builtins (parse_in, flag_hosted); 1414 c_cpp_builtins (parse_in); 1415 1416 /* We're about to send user input to cpplib, so make it warn for 1417 things that we previously (when we sent it internal definitions) 1418 told it to not warn. 1419 1420 C99 permits implementation-defined characters in identifiers. 1421 The documented meaning of -std= is to turn off extensions that 1422 conflict with the specified standard, and since a strictly 1423 conforming program cannot contain a '$', we do not condition 1424 their acceptance on the -std= setting. */ 1425 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99); 1426 1427 cb_file_change (parse_in, 1428 linemap_add (&line_table, LC_RENAME, 0, 1429 _("<command-line>"), 0)); 1430 1431 for (i = 0; i < deferred_count; i++) 1432 { 1433 struct deferred_opt *opt = &deferred_opts[i]; 1434 1435 if (opt->code == OPT_D) 1436 cpp_define (parse_in, opt->arg); 1437 else if (opt->code == OPT_U) 1438 cpp_undef (parse_in, opt->arg); 1439 else if (opt->code == OPT_A) 1440 { 1441 if (opt->arg[0] == '-') 1442 cpp_unassert (parse_in, opt->arg + 1); 1443 else 1444 cpp_assert (parse_in, opt->arg); 1445 } 1446 } 1447 1448 /* Handle -imacros after -D and -U. */ 1449 for (i = 0; i < deferred_count; i++) 1450 { 1451 struct deferred_opt *opt = &deferred_opts[i]; 1452 1453 if (opt->code == OPT_imacros 1454 && cpp_push_include (parse_in, opt->arg)) 1455 { 1456 /* Disable push_command_line_include callback for now. */ 1457 include_cursor = deferred_count + 1; 1458 cpp_scan_nooutput (parse_in); 1459 } 1460 } 1461 } 1462 else if (cpp_opts->directives_only) 1463 cpp_init_special_builtins (parse_in); 1464 1465 include_cursor = 0; 1466 push_command_line_include (); 1467} 1468 1469/* Give CPP the next file given by -include, if any. */ 1470static void 1471push_command_line_include (void) 1472{ 1473 while (include_cursor < deferred_count) 1474 { 1475 struct deferred_opt *opt = &deferred_opts[include_cursor++]; 1476 1477 if (!cpp_opts->preprocessed && opt->code == OPT_include 1478 && cpp_push_include (parse_in, opt->arg)) 1479 return; 1480 } 1481 1482 if (include_cursor == deferred_count) 1483 { 1484 include_cursor++; 1485 /* -Wunused-macros should only warn about macros defined hereafter. */ 1486 cpp_opts->warn_unused_macros = warn_unused_macros; 1487 /* Restore the line map from <command line>. */ 1488 if (!cpp_opts->preprocessed) 1489 cpp_change_file (parse_in, LC_RENAME, this_input_filename); 1490 1491 /* Set this here so the client can change the option if it wishes, 1492 and after stacking the main file so we don't trace the main file. */ 1493 line_table.trace_includes = cpp_opts->print_include_names; 1494 } 1495} 1496 1497/* File change callback. Has to handle -include files. */ 1498static void 1499cb_file_change (cpp_reader * ARG_UNUSED (pfile), 1500 const struct line_map *new_map) 1501{ 1502 if (flag_preprocess_only) 1503 pp_file_change (new_map); 1504 else 1505 fe_file_change (new_map); 1506 1507 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map))) 1508 push_command_line_include (); 1509} 1510 1511void 1512cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir) 1513{ 1514 if (!set_src_pwd (dir)) 1515 warning (0, "too late for # directive to set debug directory"); 1516} 1517 1518/* Set the C 89 standard (with 1994 amendments if C94, without GNU 1519 extensions if ISO). There is no concept of gnu94. */ 1520static void 1521set_std_c89 (int c94, int iso) 1522{ 1523 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89); 1524 flag_iso = iso; 1525 flag_no_asm = iso; 1526 flag_no_gnu_keywords = iso; 1527 flag_no_nonansi_builtin = iso; 1528 flag_isoc94 = c94; 1529 flag_isoc99 = 0; 1530} 1531 1532/* Set the C 99 standard (without GNU extensions if ISO). */ 1533static void 1534set_std_c99 (int iso) 1535{ 1536 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99); 1537 flag_no_asm = iso; 1538 flag_no_nonansi_builtin = iso; 1539 flag_iso = iso; 1540 flag_isoc99 = 1; 1541 flag_isoc94 = 1; 1542} 1543 1544/* Set the C++ 98 standard (without GNU extensions if ISO). */ 1545static void 1546set_std_cxx98 (int iso) 1547{ 1548 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX); 1549 flag_no_gnu_keywords = iso; 1550 flag_no_nonansi_builtin = iso; 1551 flag_iso = iso; 1552} 1553 1554/* Handle setting implicit to ON. */ 1555static void 1556set_Wimplicit (int on) 1557{ 1558 warn_implicit = on; 1559 warn_implicit_int = on; 1560 if (on) 1561 { 1562 if (mesg_implicit_function_declaration != 2) 1563 mesg_implicit_function_declaration = 1; 1564 } 1565 else 1566 mesg_implicit_function_declaration = 0; 1567} 1568 1569/* Args to -d specify what to dump. Silently ignore 1570 unrecognized options; they may be aimed at toplev.c. */ 1571static void 1572handle_OPT_d (const char *arg) 1573{ 1574 char c; 1575 1576 while ((c = *arg++) != '\0') 1577 switch (c) 1578 { 1579 case 'M': /* Dump macros only. */ 1580 case 'N': /* Dump names. */ 1581 case 'D': /* Dump definitions. */ 1582 flag_dump_macros = c; 1583 break; 1584 1585 case 'I': 1586 flag_dump_includes = 1; 1587 break; 1588 } 1589} 1590