c.opt revision 169699
1; Options for the C, ObjC, C++ and ObjC++ front ends. 2; Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc. 3; 4; This file is part of GCC. 5; 6; GCC is free software; you can redistribute it and/or modify it under 7; the terms of the GNU General Public License as published by the Free 8; Software Foundation; either version 2, or (at your option) any later 9; version. 10; 11; GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12; WARRANTY; without even the implied warranty of MERCHANTABILITY or 13; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14; for more details. 15; 16; You should have received a copy of the GNU General Public License 17; along with GCC; see the file COPYING. If not, write to the Free 18; Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 19; 02110-1301, USA. 20 21; See the GCC internals manual for a description of this file's format. 22 23; $FreeBSD: head/contrib/gcc/c.opt 169699 2007-05-19 02:12:21Z kan $ 24; Please try to keep this file in ASCII collating order. 25 26Language 27C 28 29Language 30ObjC 31 32Language 33C++ 34 35Language 36ObjC++ 37 38-output-pch= 39C ObjC C++ ObjC++ Joined Separate 40 41A 42C ObjC C++ ObjC++ Joined Separate 43-A<question>=<answer> Assert the <answer> to <question>. Putting '-' before <question> disables the <answer> to <question> 44 45C 46C ObjC C++ ObjC++ 47Do not discard comments 48 49CC 50C ObjC C++ ObjC++ 51Do not discard comments in macro expansions 52 53D 54C ObjC C++ ObjC++ Joined Separate 55-D<macro>[=<val>] Define a <macro> with <val> as its value. If just <macro> is given, <val> is taken to be 1 56 57E 58C ObjC C++ ObjC++ Undocumented 59 60F 61C ObjC C++ ObjC++ Joined Separate 62-F <dir> Add <dir> to the end of the main framework include path 63 64H 65C ObjC C++ ObjC++ 66Print the name of header files as they are used 67 68I 69C ObjC C++ ObjC++ Joined Separate 70-I <dir> Add <dir> to the end of the main include path 71 72M 73C ObjC C++ ObjC++ 74Generate make dependencies 75 76MD 77C ObjC C++ ObjC++ Separate 78Generate make dependencies and compile 79 80MF 81C ObjC C++ ObjC++ Joined Separate 82-MF <file> Write dependency output to the given file 83 84MG 85C ObjC C++ ObjC++ 86Treat missing header files as generated files 87 88MM 89C ObjC C++ ObjC++ 90Like -M but ignore system header files 91 92MMD 93C ObjC C++ ObjC++ Separate 94Like -MD but ignore system header files 95 96MP 97C ObjC C++ ObjC++ 98Generate phony targets for all headers 99 100MQ 101C ObjC C++ ObjC++ Joined Separate 102-MQ <target> Add a MAKE-quoted target 103 104MT 105C ObjC C++ ObjC++ Joined Separate 106-MT <target> Add an unquoted target 107 108P 109C ObjC C++ ObjC++ 110Do not generate #line directives 111 112U 113C ObjC C++ ObjC++ Joined Separate 114-U<macro> Undefine <macro> 115 116Wabi 117C++ ObjC++ Var(warn_abi) 118Warn about things that will change when compiling with an ABI-compliant compiler 119 120Waddress 121C ObjC C++ ObjC++ Var(warn_address) 122Warn about suspicious uses of memory addresses 123 124Wall 125C ObjC C++ ObjC++ 126Enable most warning messages 127 128Wassign-intercept 129ObjC ObjC++ Var(warn_assign_intercept) 130Warn whenever an Objective-C assignment is being intercepted by the garbage collector 131 132Wbad-function-cast 133C ObjC Var(warn_bad_function_cast) 134Warn about casting functions to incompatible types 135 136Wc++-compat 137C ObjC Var(warn_cxx_compat) 138Warn about C constructs that are not in the common subset of C and C++ 139 140 141Wcast-qual 142C ObjC C++ ObjC++ Var(warn_cast_qual) 143Warn about casts which discard qualifiers 144 145Wchar-subscripts 146C ObjC C++ ObjC++ Var(warn_char_subscripts) 147Warn about subscripts whose type is \"char\" 148 149Wcomment 150C ObjC C++ ObjC++ 151Warn about possibly nested block comments, and C++ comments spanning more than one physical line 152 153Wcomments 154C ObjC C++ ObjC++ 155Synonym for -Wcomment 156 157Wconversion 158C ObjC C++ ObjC++ Var(warn_conversion) 159Warn about possibly confusing type conversions 160 161Wctor-dtor-privacy 162C++ ObjC++ Var(warn_ctor_dtor_privacy) 163Warn when all constructors and destructors are private 164 165Wdeclaration-after-statement 166C ObjC Var(warn_declaration_after_statement) 167Warn when a declaration is found after a statement 168 169Wdeprecated 170C++ ObjC++ Var(warn_deprecated) Init(1) 171Warn about deprecated compiler features 172 173Wdiv-by-zero 174C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1) 175Warn about compile-time integer division by zero 176 177Weffc++ 178C++ ObjC++ Var(warn_ecpp) 179Warn about violations of Effective C++ style rules 180 181Wendif-labels 182C ObjC C++ ObjC++ 183Warn about stray tokens after #elif and #endif 184 185Werror 186C ObjC C++ ObjC++ 187; Documented in common.opt 188 189Werror-implicit-function-declaration 190C ObjC RejectNegative 191Make implicit function declarations an error 192 193Wfloat-equal 194C ObjC C++ ObjC++ Var(warn_float_equal) 195Warn if testing floating point numbers for equality 196 197Wformat 198C ObjC C++ ObjC++ 199Warn about printf/scanf/strftime/strfmon format string anomalies 200 201Wformat-extra-args 202C ObjC C++ ObjC++ Var(warn_format_extra_args) 203Warn if passing too many arguments to a function for its format string 204 205Wformat-nonliteral 206C ObjC C++ ObjC++ Var(warn_format_nonliteral) 207Warn about format strings that are not literals 208 209Wformat-security 210C ObjC C++ ObjC++ Var(warn_format_security) 211Warn about possible security problems with format functions 212 213Wformat-y2k 214C ObjC C++ ObjC++ Var(warn_format_y2k) 215Warn about strftime formats yielding 2-digit years 216 217Wformat-zero-length 218C ObjC Var(warn_format_zero_length) 219Warn about zero-length formats 220 221Wformat= 222C ObjC C++ ObjC++ Joined 223 224Winit-self 225C ObjC C++ ObjC++ Var(warn_init_self) 226Warn about variables which are initialized to themselves 227 228Wimplicit 229C ObjC C++ ObjC++ 230 231Wimplicit-function-declaration 232C ObjC Var(mesg_implicit_function_declaration) Init(-1) 233Warn about implicit function declarations 234 235Wimplicit-int 236C ObjC Var(warn_implicit_int) 237Warn when a declaration does not specify a type 238 239Wimport 240C ObjC C++ ObjC++ 241Deprecated. This switch has no effect 242 243Wint-to-pointer-cast 244C ObjC Var(warn_int_to_pointer_cast) Init(1) 245Warn when there is a cast to a pointer from an integer of a different size 246 247Winvalid-offsetof 248C++ ObjC++ Var(warn_invalid_offsetof) Init(1) 249Warn about invalid uses of the \"offsetof\" macro 250 251Winvalid-pch 252C ObjC C++ ObjC++ 253Warn about PCH files that are found but not used 254 255Wlong-long 256C ObjC C++ ObjC++ Var(warn_long_long) Init(1) 257Do not warn about using \"long long\" when -pedantic 258 259Wmain 260C ObjC 261Warn about suspicious declarations of \"main\" 262 263Wmissing-braces 264C ObjC C++ ObjC++ Var(warn_missing_braces) 265Warn about possibly missing braces around initializers 266 267Wmissing-declarations 268C ObjC Var(warn_missing_declarations) 269Warn about global functions without previous declarations 270 271Wmissing-field-initializers 272C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Init(-1) 273Warn about missing fields in struct initializers 274 275Wmissing-format-attribute 276C ObjC C++ ObjC++ Var(warn_missing_format_attribute) 277Warn about functions which might be candidates for format attributes 278 279Wmissing-include-dirs 280C ObjC C++ ObjC++ 281Warn about user-specified include directories that do not exist 282 283Wmissing-prototypes 284C ObjC Var(warn_missing_prototypes) 285Warn about global functions without prototypes 286 287Wmultichar 288C ObjC C++ ObjC++ 289Warn about use of multi-character character constants 290 291Wnested-externs 292C ObjC Var(warn_nested_externs) 293Warn about \"extern\" declarations not at file scope 294 295Wnon-template-friend 296C++ ObjC++ Var(warn_nontemplate_friend) Init(1) 297Warn when non-templatized friend functions are declared within a template 298 299Wnon-virtual-dtor 300C++ ObjC++ Var(warn_nonvdtor) 301Warn about non-virtual destructors 302 303Wnonnull 304C ObjC Var(warn_nonnull) 305Warn about NULL being passed to argument slots marked as requiring non-NULL 306 307Wnormalized= 308C ObjC C++ ObjC++ Joined 309-Wnormalized=<id|nfc|nfkc> Warn about non-normalised Unicode strings 310 311Wold-style-cast 312C++ ObjC++ Var(warn_old_style_cast) 313Warn if a C-style cast is used in a program 314 315Wold-style-definition 316C ObjC Var(warn_old_style_definition) 317Warn if an old-style parameter definition is used 318 319Woverlength-strings 320C ObjC C++ ObjC++ Var(warn_overlength_strings) Init(-1) 321Warn if a string is longer than the maximum portable length specified by the standard 322 323Woverloaded-virtual 324C++ ObjC++ Var(warn_overloaded_virtual) 325Warn about overloaded virtual function names 326 327Woverride-init 328C ObjC Var(warn_override_init) Init(-1) 329Warn about overriding initializers without side effects 330 331Wparentheses 332C ObjC C++ ObjC++ Var(warn_parentheses) 333Warn about possibly missing parentheses 334 335Wpmf-conversions 336C++ ObjC++ Var(warn_pmf2ptr) Init(1) 337Warn when converting the type of pointers to member functions 338 339Wpointer-arith 340C ObjC C++ ObjC++ Var(warn_pointer_arith) 341Warn about function pointer arithmetic 342 343Wpointer-to-int-cast 344C ObjC Var(warn_pointer_to_int_cast) Init(1) 345Warn when a pointer is cast to an integer of a different size 346 347Wpragmas 348C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) 349Warn about misuses of pragmas 350 351Wprotocol 352ObjC ObjC++ Var(warn_protocol) Init(1) 353Warn if inherited methods are unimplemented 354 355Wredundant-decls 356C ObjC C++ ObjC++ Var(warn_redundant_decls) 357Warn about multiple declarations of the same object 358 359Wreorder 360C++ ObjC++ Var(warn_reorder) 361Warn when the compiler reorders code 362 363Wreturn-type 364C ObjC C++ ObjC++ Var(warn_return_type) 365Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++) 366 367Wselector 368ObjC ObjC++ Var(warn_selector) 369Warn if a selector has multiple methods 370 371Wsequence-point 372C ObjC C++ ObjC++ Var(warn_sequence_point) 373Warn about possible violations of sequence point rules 374 375Wsign-compare 376C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1) 377Warn about signed-unsigned comparisons 378 379Wsign-promo 380C++ ObjC++ Var(warn_sign_promo) 381Warn when overload promotes from unsigned to signed 382 383Wstrict-null-sentinel 384C++ ObjC++ 385Warn about uncasted NULL used as sentinel 386 387Wstrict-prototypes 388C ObjC Var(warn_strict_prototypes) 389Warn about unprototyped function declarations 390 391Wstrict-selector-match 392ObjC ObjC++ Var(warn_strict_selector_match) 393Warn if type signatures of candidate methods do not match exactly 394 395Wsynth 396C++ ObjC++ Var(warn_synth) 397Warn when synthesis behavior differs from Cfront 398 399Wsystem-headers 400C ObjC C++ ObjC++ 401Do not suppress warnings from system headers 402 403Wtraditional 404C ObjC Var(warn_traditional) 405Warn about features not present in traditional C 406 407Wtrigraphs 408C ObjC C++ ObjC++ 409Warn if trigraphs are encountered that might affect the meaning of the program 410 411Wundeclared-selector 412ObjC ObjC++ Var(warn_undeclared_selector) 413Warn about @selector()s without previously declared methods 414 415Wundef 416C ObjC C++ ObjC++ 417Warn if an undefined macro is used in an #if directive 418 419Wunknown-pragmas 420C ObjC C++ ObjC++ 421Warn about unrecognized pragmas 422 423Wunused-macros 424C ObjC C++ ObjC++ 425Warn about macros defined in the main file that are not used 426 427Wvariadic-macros 428C ObjC C++ ObjC++ 429Do not warn about using variadic macros when -pedantic 430 431Wwrite-strings 432C ObjC C++ ObjC++ Var(warn_write_strings) 433In C++, nonzero means warn about deprecated conversion from string literals to `char *'. In C, similar warning, except that the conversion is of course not deprecated by the ISO C standard. 434 435Wpointer-sign 436C ObjC Var(warn_pointer_sign) Init(-1) 437Warn when a pointer differs in signedness in an assignment 438 439ansi 440C ObjC C++ ObjC++ 441A synonym for -std=c89 (for C) or -std=c++98 (for C++) 442 443d 444C ObjC C++ ObjC++ Joined 445; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD? 446 447faccess-control 448C++ ObjC++ 449Enforce class member access control semantics 450 451fall-virtual 452C++ ObjC++ 453 454falt-external-templates 455C++ ObjC++ 456Change when template instances are emitted 457 458fasm 459C ObjC C++ ObjC++ 460Recognize the \"asm\" keyword 461 462fbuiltin 463C ObjC C++ ObjC++ 464Recognize built-in functions 465 466fbuiltin- 467C ObjC C++ ObjC++ Joined 468 469fcheck-new 470C++ ObjC++ 471Check the return value of new 472 473fcond-mismatch 474C ObjC C++ ObjC++ 475Allow the arguments of the '?' operator to have different types 476 477fconserve-space 478C++ ObjC++ 479Reduce the size of object files 480 481fconstant-string-class= 482ObjC ObjC++ Joined 483-fconst-string-class=<name> Use class <name> for constant strings 484 485fdefault-inline 486C++ ObjC++ 487Inline member functions by default 488 489fdollars-in-identifiers 490C ObjC C++ ObjC++ 491Permit '$' as an identifier character 492 493felide-constructors 494C++ ObjC++ 495 496fenforce-eh-specs 497C++ ObjC++ 498Generate code to check exception specifications 499 500fenum-int-equiv 501C++ ObjC++ 502 503fexec-charset= 504C ObjC C++ ObjC++ Joined RejectNegative 505-fexec-charset=<cset> Convert all strings and character constants to character set <cset> 506 507fextended-identifiers 508C ObjC C++ ObjC++ 509Permit universal character names (\\u and \\U) in identifiers 510 511finput-charset= 512C ObjC C++ ObjC++ Joined RejectNegative 513-finput-charset=<cset> Specify the default character set for source files 514 515 516fexternal-templates 517C++ ObjC++ 518 519ffor-scope 520C++ ObjC++ 521Scope of for-init-statement variables is local to the loop 522 523ffreestanding 524C ObjC 525Do not assume that standard C libraries and \"main\" exist 526 527fgnu-keywords 528C++ ObjC++ 529Recognize GNU-defined keywords 530 531fgnu-runtime 532ObjC ObjC++ 533Generate code for GNU runtime environment 534 535fgnu89-inline 536C ObjC Var(flag_gnu89_inline) Init(-1) 537Use traditional GNU semantics for inline functions 538 539fguiding-decls 540C++ ObjC++ 541 542fhandle-exceptions 543C++ ObjC++ 544 545fhonor-std 546C++ ObjC++ 547 548fhosted 549C ObjC 550Assume normal C execution environment 551 552fhuge-objects 553C++ ObjC++ 554Enable support for huge objects 555 556fimplement-inlines 557C++ ObjC++ 558Export functions even if they can be inlined 559 560fimplicit-inline-templates 561C++ ObjC++ 562Emit implicit instantiations of inline templates 563 564fimplicit-templates 565C++ ObjC++ 566Emit implicit instantiations of templates 567 568ffriend-injection 569C++ ObjC++ Var(flag_friend_injection) 570Inject friend functions into enclosing namespace 571 572flabels-ok 573C++ ObjC++ 574 575fms-extensions 576C ObjC C++ ObjC++ 577Don't warn about uses of Microsoft extensions 578 579fname-mangling-version- 580C++ ObjC++ Joined 581 582fnew-abi 583C++ ObjC++ 584 585fnext-runtime 586ObjC ObjC++ 587Generate code for NeXT (Apple Mac OS X) runtime environment 588 589fnil-receivers 590ObjC ObjC++ 591Assume that receivers of Objective-C messages may be nil 592 593fnonansi-builtins 594C++ ObjC++ 595 596fnonnull-objects 597C++ ObjC++ 598 599; Generate special '- .cxx_construct' and '- .cxx_destruct' methods 600; to initialize any non-POD ivars in Objective-C++ classes. 601fobjc-call-cxx-cdtors 602ObjC++ Var(flag_objc_call_cxx_cdtors) 603Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed 604 605fobjc-direct-dispatch 606ObjC ObjC++ Var(flag_objc_direct_dispatch) 607Allow fast jumps to the message dispatcher 608 609; Nonzero means that we will allow new ObjC exception syntax (@throw, 610; @try, etc.) in source code. 611fobjc-exceptions 612ObjC ObjC++ Var(flag_objc_exceptions) 613Enable Objective-C exception and synchronization syntax 614 615fobjc-gc 616ObjC ObjC++ Var(flag_objc_gc) 617Enable garbage collection (GC) in Objective-C/Objective-C++ programs 618 619; Nonzero means that we generate NeXT setjmp based exceptions. 620fobjc-sjlj-exceptions 621ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1) 622Enable Objective-C setjmp exception handling runtime 623 624fopenmp 625C ObjC C++ ObjC++ Var(flag_openmp) 626Enable OpenMP 627 628foperator-names 629C++ ObjC++ 630Recognize C++ kewords like \"compl\" and \"xor\" 631 632foptional-diags 633C++ ObjC++ 634Enable optional diagnostics 635 636fpch-deps 637C ObjC C++ ObjC++ 638 639fpch-preprocess 640C ObjC C++ ObjC++ 641Look for and use PCH files even when preprocessing 642 643fpermissive 644C++ ObjC++ 645Downgrade conformance errors to warnings 646 647fpreprocessed 648C ObjC C++ ObjC++ 649Treat the input file as already preprocessed 650 651freplace-objc-classes 652ObjC ObjC++ 653Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime 654 655frepo 656C++ ObjC++ 657Enable automatic template instantiation 658 659frtti 660C++ ObjC++ 661Generate run time type descriptor information 662 663fshort-double 664C ObjC C++ ObjC++ 665Use the same size for double as for float 666 667fshort-enums 668C ObjC C++ ObjC++ 669Use the narrowest integer type possible for enumeration types 670 671fshort-wchar 672C ObjC C++ ObjC++ 673Force the underlying type for \"wchar_t\" to be \"unsigned short\" 674 675fsigned-bitfields 676C ObjC C++ ObjC++ 677When \"signed\" or \"unsigned\" is not given make the bitfield signed 678 679fsigned-char 680C ObjC C++ ObjC++ 681Make \"char\" signed by default 682 683fsquangle 684C++ ObjC++ 685 686fstats 687C++ ObjC++ 688Display statistics accumulated during compilation 689 690fstrict-prototype 691C++ ObjC++ 692 693ftabstop= 694C ObjC C++ ObjC++ Joined RejectNegative UInteger 695-ftabstop=<number> Distance between tab stops for column reporting 696 697ftemplate-depth- 698C++ ObjC++ Joined RejectNegative UInteger 699-ftemplate-depth-<number> Specify maximum template instantiation depth 700 701fthis-is-variable 702C++ ObjC++ 703 704fthreadsafe-statics 705C++ ObjC++ 706-fno-threadsafe-statics Do not generate thread-safe code for initializing local statics 707 708funsigned-bitfields 709C ObjC C++ ObjC++ 710When \"signed\" or \"unsigned\" is not given make the bitfield unsigned 711 712funsigned-char 713C ObjC C++ ObjC++ 714Make \"char\" unsigned by default 715 716fuse-cxa-atexit 717C++ ObjC++ 718Use __cxa_atexit to register destructors 719 720fuse-cxa-get-exception-ptr 721C++ ObjC++ 722Use __cxa_get_exception_ptr in exception handling 723 724fvisibility-inlines-hidden 725C++ ObjC++ 726Marks all inlined methods as having hidden visibility 727 728fvtable-gc 729C++ ObjC++ 730Discard unused virtual functions 731 732fvtable-thunks 733C++ ObjC++ 734Implement vtables using thunks 735 736fweak 737C++ ObjC++ 738Emit common-like symbols as weak symbols 739 740fwide-exec-charset= 741C ObjC C++ ObjC++ Joined RejectNegative 742-fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset> 743 744fworking-directory 745C ObjC C++ ObjC++ 746Generate a #line directive pointing at the current working directory 747 748fxref 749C++ ObjC++ 750Emit cross referencing information 751 752fzero-link 753ObjC ObjC++ 754Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode 755 756gen-decls 757ObjC ObjC++ 758Dump declarations to a .decl file 759 760idirafter 761C ObjC C++ ObjC++ Joined Separate 762-idirafter <dir> Add <dir> to the end of the system include path 763 764imacros 765C ObjC C++ ObjC++ Joined Separate 766-imacros <file> Accept definition of macros in <file> 767 768imultilib 769C ObjC C++ ObjC++ Joined Separate 770-imultilib <dir> Set <dir> to be the multilib include subdirectory 771 772include 773C ObjC C++ ObjC++ Joined Separate 774-include <file> Include the contents of <file> before other files 775 776iprefix 777C ObjC C++ ObjC++ Joined Separate 778-iprefix <path> Specify <path> as a prefix for next two options 779 780isysroot 781C ObjC C++ ObjC++ Joined Separate 782-isysroot <dir> Set <dir> to be the system root directory 783 784isystem 785C ObjC C++ ObjC++ Joined Separate 786-isystem <dir> Add <dir> to the start of the system include path 787 788iquote 789C ObjC C++ ObjC++ Joined Separate 790-iquote <dir> Add <dir> to the end of the quote include path 791 792iwithprefix 793C ObjC C++ ObjC++ Joined Separate 794-iwithprefix <dir> Add <dir> to the end of the system include path 795 796iwithprefixbefore 797C ObjC C++ ObjC++ Joined Separate 798-iwithprefixbefore <dir> Add <dir> to the end of the main include path 799 800lang-asm 801C Undocumented 802 803lang-fortran 804C Undocumented 805 806lang-objc 807C ObjC C++ ObjC++ Undocumented 808 809nostdinc 810C ObjC C++ ObjC++ 811Do not search standard system include directories (those specified with -isystem will still be used) 812 813nostdinc++ 814C++ ObjC++ 815Do not search standard system include directories for C++ 816 817o 818C ObjC C++ ObjC++ Joined Separate 819; Documented in common.opt 820 821pedantic 822C ObjC C++ ObjC++ 823; Documented in common.opt 824 825pedantic-errors 826C ObjC C++ ObjC++ 827; Documented in common.opt 828 829print-objc-runtime-info 830ObjC ObjC++ 831Generate C header of platform-specific features 832 833print-pch-checksum 834C ObjC C++ ObjC++ 835Print a checksum of the executable for PCH validity checking, and stop 836 837remap 838C ObjC C++ ObjC++ 839Remap file names when including files 840 841std=c++98 842C++ ObjC++ 843Conform to the ISO 1998 C++ standard 844 845std=c89 846C ObjC 847Conform to the ISO 1990 C standard 848 849std=c99 850C ObjC 851Conform to the ISO 1999 C standard 852 853std=c9x 854C ObjC 855Deprecated in favor of -std=c99 856 857std=gnu++98 858C++ ObjC++ 859Conform to the ISO 1998 C++ standard with GNU extensions 860 861std=gnu89 862C ObjC 863Conform to the ISO 1990 C standard with GNU extensions 864 865std=gnu99 866C ObjC 867Conform to the ISO 1999 C standard with GNU extensions 868 869std=gnu9x 870C ObjC 871Deprecated in favor of -std=gnu99 872 873std=iso9899:1990 874C ObjC 875Conform to the ISO 1990 C standard 876 877std=iso9899:199409 878C ObjC 879Conform to the ISO 1990 C standard as amended in 1994 880 881std=iso9899:1999 882C ObjC 883Conform to the ISO 1999 C standard 884 885std=iso9899:199x 886C ObjC 887Deprecated in favor of -std=iso9899:1999 888 889traditional-cpp 890C ObjC C++ ObjC++ 891Enable traditional preprocessing 892 893trigraphs 894C ObjC C++ ObjC++ 895-trigraphs Support ISO C trigraphs 896 897undef 898C ObjC C++ ObjC++ 899Do not predefine system-specific and GCC-specific macros 900 901v 902C ObjC C++ ObjC++ 903Enable verbose output 904 905w 906C ObjC C++ ObjC++ 907; Documented in common.opt 908 909; This comment is to ensure we retain the blank line above. 910