1; Options for the C, ObjC, C++ and ObjC++ front ends. 2; Copyright (C) 2003-2014 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 3, 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 COPYING3. If not see 18; <http://www.gnu.org/licenses/>. 19 20; See the GCC internals manual for a description of this file's format. 21 22; Please try to keep this file in ASCII collating order. 23 24Language 25C 26 27Language 28ObjC 29 30Language 31C++ 32 33Language 34ObjC++ 35 36-all-warnings 37C ObjC C++ ObjC++ Warning Alias(Wall) 38 39-ansi 40C ObjC C++ ObjC++ Alias(ansi) 41 42-assert 43C ObjC C++ ObjC++ Separate Alias(A) MissingArgError(assertion missing after %qs) 44 45-assert= 46C ObjC C++ ObjC++ Joined Alias(A) MissingArgError(assertion missing after %qs) 47 48-comments 49C ObjC C++ ObjC++ Alias(C) 50 51-comments-in-macros 52C ObjC C++ ObjC++ Alias(CC) 53 54-define-macro 55C ObjC C++ ObjC++ Separate Alias(D) MissingArgError(macro name missing after %qs) 56 57-define-macro= 58C ObjC C++ ObjC++ Joined Alias(D) MissingArgError(macro name missing after %qs) 59 60-dependencies 61C ObjC C++ ObjC++ Alias(M) 62 63-dump 64C ObjC C++ ObjC++ Separate Alias(d) 65 66-dump= 67C ObjC C++ ObjC++ Joined Alias(d) 68 69-imacros 70C ObjC C++ ObjC++ Separate Alias(imacros) MissingArgError(missing filename after %qs) 71 72-imacros= 73C ObjC C++ ObjC++ Joined Alias(imacros) MissingArgError(missing filename after %qs) 74 75-include 76C ObjC C++ ObjC++ Separate Alias(include) MissingArgError(missing filename after %qs) 77 78-include= 79C ObjC C++ ObjC++ Joined Alias(include) MissingArgError(missing filename after %qs) 80 81-include-barrier 82C ObjC C++ ObjC++ Alias(I, -) 83 84-include-directory 85C ObjC C++ ObjC++ Separate Alias(I) MissingArgError(missing path after %qs) 86 87-include-directory= 88C ObjC C++ ObjC++ Joined Alias(I) MissingArgError(missing path after %qs) 89 90-include-directory-after 91C ObjC C++ ObjC++ Separate Alias(idirafter) MissingArgError(missing path after %qs) 92 93-include-directory-after= 94C ObjC C++ ObjC++ Joined Alias(idirafter) MissingArgError(missing path after %qs) 95 96-include-prefix 97C ObjC C++ ObjC++ Separate Alias(iprefix) 98 99-include-prefix= 100C ObjC C++ ObjC++ JoinedOrMissing Alias(iprefix) 101 102-include-with-prefix 103C ObjC C++ ObjC++ Separate Alias(iwithprefix) 104 105-include-with-prefix= 106C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefix) 107 108-include-with-prefix-after 109C ObjC C++ ObjC++ Separate Alias(iwithprefix) 110 111-include-with-prefix-after= 112C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefix) 113 114-include-with-prefix-before 115C ObjC C++ ObjC++ Separate Alias(iwithprefixbefore) 116 117-include-with-prefix-before= 118C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefixbefore) 119 120-no-integrated-cpp 121Driver Alias(no-integrated-cpp) 122 123-no-line-commands 124C ObjC C++ ObjC++ Alias(P) 125 126-no-standard-includes 127C ObjC C++ ObjC++ Alias(nostdinc) 128 129-no-warnings 130C ObjC C++ ObjC++ Alias(w) 131 132-output 133C ObjC C++ ObjC++ Separate Alias(o) 134 135-output= 136C ObjC C++ ObjC++ Joined Alias(o) 137 138-output-pch= 139C ObjC C++ ObjC++ Joined Separate 140 141-pedantic 142C ObjC C++ ObjC++ Alias(pedantic) 143 144-preprocess 145C ObjC C++ ObjC++ Undocumented Alias(E) 146 147-print-missing-file-dependencies 148C ObjC C++ ObjC++ Alias(MG) 149 150-trace-includes 151C ObjC C++ ObjC++ Alias(H) 152 153-traditional 154Driver Alias(traditional) 155 156-traditional-cpp 157C ObjC C++ ObjC++ Alias(traditional-cpp) 158 159-trigraphs 160C ObjC C++ ObjC++ Alias(trigraphs) 161 162-undefine-macro 163C ObjC C++ ObjC++ Separate Alias(U) MissingArgError(macro name missing after %qs) 164 165-undefine-macro= 166C ObjC C++ ObjC++ Joined Alias(U) MissingArgError(macro name missing after %qs) 167 168-user-dependencies 169C ObjC C++ ObjC++ Alias(MM) 170 171-verbose 172Common C ObjC C++ ObjC++ Alias(v) 173 174-write-dependencies 175C ObjC C++ ObjC++ NoDriverArg Separate Alias(MD) MissingArgError(missing filename after %qs) 176 177-write-user-dependencies 178C ObjC C++ ObjC++ NoDriverArg Separate Alias(MMD) MissingArgError(missing filename after %qs) 179 180A 181C ObjC C++ ObjC++ Joined Separate MissingArgError(assertion missing after %qs) 182-A<question>=<answer> Assert the <answer> to <question>. Putting '-' before <question> disables the <answer> to <question> 183 184C 185C ObjC C++ ObjC++ 186Do not discard comments 187 188CC 189C ObjC C++ ObjC++ 190Do not discard comments in macro expansions 191 192D 193C ObjC C++ ObjC++ Joined Separate MissingArgError(macro name missing after %qs) 194-D<macro>[=<val>] Define a <macro> with <val> as its value. If just <macro> is given, <val> is taken to be 1 195 196E 197C ObjC C++ ObjC++ Undocumented Var(flag_preprocess_only) 198 199F 200Driver C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs) 201-F <dir> Add <dir> to the end of the main framework include path 202 203H 204C ObjC C++ ObjC++ 205Print the name of header files as they are used 206 207I 208C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs) 209-I <dir> Add <dir> to the end of the main include path 210 211M 212C ObjC C++ ObjC++ 213Generate make dependencies 214 215MD 216C ObjC C++ ObjC++ NoDriverArg Separate MissingArgError(missing filename after %qs) 217Generate make dependencies and compile 218 219MF 220C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs) 221-MF <file> Write dependency output to the given file 222 223MG 224C ObjC C++ ObjC++ 225Treat missing header files as generated files 226 227MM 228C ObjC C++ ObjC++ 229Like -M but ignore system header files 230 231MMD 232C ObjC C++ ObjC++ NoDriverArg Separate MissingArgError(missing filename after %qs) 233Like -MD but ignore system header files 234 235MP 236C ObjC C++ ObjC++ 237Generate phony targets for all headers 238 239MQ 240C ObjC C++ ObjC++ Joined Separate MissingArgError(missing makefile target after %qs) 241-MQ <target> Add a MAKE-quoted target 242 243MT 244C ObjC C++ ObjC++ Joined Separate MissingArgError(missing makefile target after %qs) 245-MT <target> Add an unquoted target 246 247P 248C ObjC C++ ObjC++ 249Do not generate #line directives 250 251U 252C ObjC C++ ObjC++ Joined Separate MissingArgError(macro name missing after %qs) 253-U<macro> Undefine <macro> 254 255Wabi 256C ObjC C++ ObjC++ LTO Var(warn_abi) Warning 257Warn about things that will change when compiling with an ABI-compliant compiler 258 259Wabi-tag 260C++ ObjC++ Var(warn_abi_tag) Warning 261Warn if a subobject has an abi_tag attribute that the complete object type does not have 262 263Wpsabi 264C ObjC C++ ObjC++ LTO Var(warn_psabi) Init(1) Undocumented 265 266Waddress 267C ObjC C++ ObjC++ Var(warn_address) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall) 268Warn about suspicious uses of memory addresses 269 270Wall 271C ObjC C++ ObjC++ Warning 272Enable most warning messages 273 274Warray-bounds 275LangEnabledBy(C ObjC C++ ObjC++,Wall) 276; in common.opt 277 278Wassign-intercept 279ObjC ObjC++ Var(warn_assign_intercept) Warning 280Warn whenever an Objective-C assignment is being intercepted by the garbage collector 281 282Wbad-function-cast 283C ObjC Var(warn_bad_function_cast) Warning 284Warn about casting functions to incompatible types 285 286Wbuiltin-macro-redefined 287C ObjC C++ ObjC++ Warning 288Warn when a built-in preprocessor macro is undefined or redefined 289 290Wc++-compat 291C ObjC Var(warn_cxx_compat) Warning 292Warn about C constructs that are not in the common subset of C and C++ 293 294Wc++0x-compat 295C++ ObjC++ Var(warn_cxx0x_compat) Warning LangEnabledBy(C++ ObjC++,Wall) 296Deprecated in favor of -Wc++11-compat 297 298Wc++11-compat 299C++ ObjC++ Warning Alias(Wc++0x-compat) 300Warn about C++ constructs whose meaning differs between ISO C++ 1998 and ISO C++ 2011 301 302Wcast-qual 303C ObjC C++ ObjC++ Var(warn_cast_qual) Warning 304Warn about casts which discard qualifiers 305 306Wchar-subscripts 307C ObjC C++ ObjC++ Var(warn_char_subscripts) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall) 308Warn about subscripts whose type is \"char\" 309 310Wclobbered 311C ObjC C++ ObjC++ Var(warn_clobbered) Warning EnabledBy(Wextra) 312Warn about variables that might be changed by \"longjmp\" or \"vfork\" 313 314Wcomment 315C ObjC C++ ObjC++ Warning 316Warn about possibly nested block comments, and C++ comments spanning more than one physical line 317 318Wcomments 319C ObjC C++ ObjC++ Warning Alias(Wcomment) 320Synonym for -Wcomment 321 322Wconditionally-supported 323C++ ObjC++ Var(warn_conditionally_supported) Warning 324Warn for conditionally-supported constructs 325 326Wconversion 327C ObjC C++ ObjC++ Var(warn_conversion) Warning 328Warn for implicit type conversions that may change a value 329 330Wconversion-null 331C++ ObjC++ Var(warn_conversion_null) Init(1) Warning 332Warn for converting NULL from/to a non-pointer type 333 334Wctor-dtor-privacy 335C++ ObjC++ Var(warn_ctor_dtor_privacy) Warning 336Warn when all constructors and destructors are private 337 338Wdeclaration-after-statement 339C ObjC Var(warn_declaration_after_statement) Warning 340Warn when a declaration is found after a statement 341 342Wdelete-incomplete 343C++ ObjC++ Var(warn_delete_incomplete) Init(1) Warning 344Warn when deleting a pointer to incomplete type 345 346Wdelete-non-virtual-dtor 347C++ ObjC++ Var(warn_delnonvdtor) Warning LangEnabledBy(C++ ObjC++,Wall) 348Warn about deleting polymorphic objects with non-virtual destructors 349 350Wdelete-non-virtual-dtor 351LangEnabledBy(C++ ObjC++,Weffc++) 352; 353 354Wdeprecated 355C C++ ObjC ObjC++ Var(warn_deprecated) Init(1) Warning 356Warn if a deprecated compiler feature, class, method, or field is used 357 358Wdiv-by-zero 359C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1) Warning 360Warn about compile-time integer division by zero 361 362Weffc++ 363C++ ObjC++ Var(warn_ecpp) Warning 364Warn about violations of Effective C++ style rules 365 366Wempty-body 367C ObjC C++ ObjC++ Var(warn_empty_body) Warning EnabledBy(Wextra) 368Warn about an empty body in an if or else statement 369 370Wendif-labels 371C ObjC C++ ObjC++ Warning 372Warn about stray tokens after #elif and #endif 373 374Wenum-compare 375C ObjC C++ ObjC++ Var(warn_enum_compare) Init(-1) Warning LangEnabledBy(C ObjC,Wall) 376Warn about comparison of different enum types 377 378Wenum-compare 379LangEnabledBy(C ObjC,Wc++-compat) 380; 381 382Werror 383C ObjC C++ ObjC++ 384; Documented in common.opt 385 386Werror-implicit-function-declaration 387C ObjC RejectNegative Warning Alias(Werror=, implicit-function-declaration) 388This switch is deprecated; use -Werror=implicit-function-declaration instead 389 390Wfloat-conversion 391C ObjC C++ ObjC++ Var(warn_float_conversion) LangEnabledBy(C ObjC C++ ObjC++,Wconversion) 392Warn for implicit type conversions that cause loss of floating point precision 393 394Wfloat-equal 395C ObjC C++ ObjC++ Var(warn_float_equal) Warning 396Warn if testing floating point numbers for equality 397 398Wformat 399C ObjC C++ ObjC++ Warning Alias(Wformat=, 1, 0) 400Warn about printf/scanf/strftime/strfmon format string anomalies 401 402Wformat-contains-nul 403C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0) 404Warn about format strings that contain NUL bytes 405 406Wformat-extra-args 407C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0) 408Warn if passing too many arguments to a function for its format string 409 410Wformat-nonliteral 411C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0) 412Warn about format strings that are not literals 413 414Wformat-security 415C ObjC C++ ObjC++ Var(warn_format_security) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0) 416Warn about possible security problems with format functions 417 418Wformat-y2k 419C ObjC C++ ObjC++ Var(warn_format_y2k) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 2, 0) 420Warn about strftime formats yielding 2-digit years 421 422Wformat-zero-length 423C ObjC C++ ObjC++ Var(warn_format_zero_length) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1, 0) 424Warn about zero-length formats 425 426Wformat= 427C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_format) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0) 428Warn about printf/scanf/strftime/strfmon format string anomalies 429 430Wignored-qualifiers 431C C++ Var(warn_ignored_qualifiers) Warning EnabledBy(Wextra) 432Warn whenever type qualifiers are ignored. 433 434Winit-self 435C ObjC C++ ObjC++ Var(warn_init_self) Warning LangEnabledBy(C++ ObjC++,Wall) 436Warn about variables which are initialized to themselves 437 438Wimplicit 439C ObjC Var(warn_implicit) Warning LangEnabledBy(C ObjC,Wall) 440Warn about implicit declarations 441 442Wdouble-promotion 443C ObjC C++ ObjC++ Var(warn_double_promotion) Warning 444Warn about implicit conversions from \"float\" to \"double\" 445 446Wimplicit-function-declaration 447C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning LangEnabledBy(C ObjC,Wimplicit) 448Warn about implicit function declarations 449 450Wimplicit-int 451C ObjC Var(warn_implicit_int) Warning LangEnabledBy(C ObjC,Wimplicit) 452Warn when a declaration does not specify a type 453 454Wimport 455C ObjC C++ ObjC++ Undocumented Ignore 456 457Winherited-variadic-ctor 458C++ ObjC++ Var(warn_inh_var_ctor) Init(1) Warning 459Warn about C++11 inheriting constructors when the base has a variadic constructor 460 461Wint-to-pointer-cast 462C ObjC C++ ObjC++ Var(warn_int_to_pointer_cast) Init(1) Warning 463Warn when there is a cast to a pointer from an integer of a different size 464 465Winvalid-offsetof 466C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning 467Warn about invalid uses of the \"offsetof\" macro 468 469Winvalid-pch 470C ObjC C++ ObjC++ Warning 471Warn about PCH files that are found but not used 472 473Wjump-misses-init 474C ObjC Var(warn_jump_misses_init) Warning LangEnabledby(C ObjC,Wc++-compat) 475Warn when a jump misses a variable initialization 476 477Wliteral-suffix 478C++ ObjC++ Warning 479Warn when a string or character literal is followed by a ud-suffix which does not begin with an underscore. 480 481Wlogical-op 482C ObjC C++ ObjC++ Var(warn_logical_op) Init(0) Warning 483Warn when a logical operator is suspiciously always evaluating to true or false 484 485Wlong-long 486C ObjC C++ ObjC++ Var(warn_long_long) Init(-1) Warning 487Do not warn about using \"long long\" when -pedantic 488 489Wmain 490C ObjC C++ ObjC++ Var(warn_main) Init(-1) Warning LangEnabledBy(C ObjC,Wall, 2, 0) 491Warn about suspicious declarations of \"main\" 492 493Wmain 494LangEnabledBy(C ObjC C++ ObjC++,Wpedantic, 2, 0) 495; 496 497Wmissing-braces 498C ObjC C++ ObjC++ Var(warn_missing_braces) Warning LangEnabledBy(C ObjC,Wall) 499Warn about possibly missing braces around initializers 500 501Wmissing-declarations 502C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning 503Warn about global functions without previous declarations 504 505Wmissing-field-initializers 506C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Warning EnabledBy(Wextra) 507Warn about missing fields in struct initializers 508 509Wsizeof-pointer-memaccess 510C ObjC C++ ObjC++ Var(warn_sizeof_pointer_memaccess) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall) 511 512Wsuggest-attribute=format 513C ObjC C++ ObjC++ Var(warn_suggest_attribute_format) Warning 514Warn about functions which might be candidates for format attributes 515 516Wswitch 517C ObjC C++ ObjC++ Var(warn_switch) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall) 518Warn about enumerated switches, with no default, missing a case 519 520Wswitch-default 521C ObjC C++ ObjC++ Var(warn_switch_default) Warning 522Warn about enumerated switches missing a \"default:\" statement 523 524Wswitch-enum 525C ObjC C++ ObjC++ Var(warn_switch_enum) Warning 526Warn about all enumerated switches missing a specific case 527 528Wmissing-format-attribute 529C ObjC C++ ObjC++ Alias(Wsuggest-attribute=format) 530; 531 532Wmissing-include-dirs 533C ObjC C++ ObjC++ Warning 534Warn about user-specified include directories that do not exist 535 536Wmissing-parameter-type 537C ObjC Var(warn_missing_parameter_type) Warning EnabledBy(Wextra) 538Warn about function parameters declared without a type specifier in K&R-style functions 539 540Wmissing-prototypes 541C ObjC Var(warn_missing_prototypes) Warning 542Warn about global functions without prototypes 543 544Wmudflap 545C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 546 547Wmultichar 548C ObjC C++ ObjC++ Warning 549Warn about use of multi-character character constants 550 551Wnarrowing 552C ObjC C++ ObjC++ Warning Var(warn_narrowing) Init(-1) LangEnabledBy(C++ ObjC++,Wall) 553Warn about narrowing conversions within { } that are ill-formed in C++11 554 555Wnarrowing 556C ObjC C++ ObjC++ LangEnabledBy(C++ ObjC++,Wc++0x-compat) 557; 558 559Wnested-externs 560C ObjC Var(warn_nested_externs) Warning 561Warn about \"extern\" declarations not at file scope 562 563Wnoexcept 564C++ ObjC++ Var(warn_noexcept) Warning 565Warn when a noexcept expression evaluates to false even though the expression can't actually throw 566 567Wnon-template-friend 568C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning 569Warn when non-templatized friend functions are declared within a template 570 571Wnon-virtual-dtor 572C++ ObjC++ Var(warn_nonvdtor) Warning LangEnabledBy(C++ ObjC++,Weffc++) 573Warn about non-virtual destructors 574 575Wnonnull 576C ObjC C++ ObjC++ Var(warn_nonnull) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1,0) 577Warn about NULL being passed to argument slots marked as requiring non-NULL 578 579Wnonnull 580C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall) 581; 582 583Wnormalized= 584C ObjC C++ ObjC++ Joined Warning 585-Wnormalized=<id|nfc|nfkc> Warn about non-normalised Unicode strings 586 587Wold-style-cast 588C++ ObjC++ Var(warn_old_style_cast) Warning 589Warn if a C-style cast is used in a program 590 591Wold-style-declaration 592C ObjC Var(warn_old_style_declaration) Warning EnabledBy(Wextra) 593Warn for obsolescent usage in a declaration 594 595Wold-style-definition 596C ObjC Var(warn_old_style_definition) Warning 597Warn if an old-style parameter definition is used 598 599Wopenmp-simd 600C C++ Var(warn_openmp_simd) Warning LangEnabledBy(C C++,Wall) 601Warn if a simd directive is overridden by the vectorizer cost model 602 603Woverlength-strings 604C ObjC C++ ObjC++ Var(warn_overlength_strings) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic) 605Warn if a string is longer than the maximum portable length specified by the standard 606 607Woverloaded-virtual 608C++ ObjC++ Var(warn_overloaded_virtual) Warning 609Warn about overloaded virtual function names 610 611Woverride-init 612C ObjC Var(warn_override_init) Warning EnabledBy(Wextra) 613Warn about overriding initializers without side effects 614 615Wpacked-bitfield-compat 616C ObjC C++ ObjC++ Var(warn_packed_bitfield_compat) Init(-1) Warning 617Warn about packed bit-fields whose offset changed in GCC 4.4 618 619Wparentheses 620C ObjC C++ ObjC++ Var(warn_parentheses) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall) 621Warn about possibly missing parentheses 622 623Wpedantic 624C ObjC C++ ObjC++ Warning 625; Documented in common.opt 626 627Wpmf-conversions 628C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning 629Warn when converting the type of pointers to member functions 630 631Wpointer-arith 632C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic) 633Warn about function pointer arithmetic 634 635Wpointer-sign 636C ObjC Var(warn_pointer_sign) Warning LangEnabledBy(C ObjC,Wall) 637Warn when a pointer differs in signedness in an assignment 638 639Wpointer-sign 640C ObjC LangEnabledBy(C ObjC,Wpedantic) 641; 642 643Wpointer-to-int-cast 644C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning 645Warn when a pointer is cast to an integer of a different size 646 647Wpragmas 648C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning 649Warn about misuses of pragmas 650 651Wdate-time 652Common Var(cpp_warn_date_time) Warning 653Warn about __TIME__, __DATE__ and __TIMESTAMP__ usage 654 655Wproperty-assign-default 656ObjC ObjC++ Var(warn_property_assign_default) Init(1) Warning 657Warn if a property for an Objective-C object has no assign semantics specified 658 659Wprotocol 660ObjC ObjC++ Var(warn_protocol) Init(1) Warning 661Warn if inherited methods are unimplemented 662 663Wredundant-decls 664C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning 665Warn about multiple declarations of the same object 666 667Wreorder 668C++ ObjC++ Var(warn_reorder) Warning LangEnabledBy(C++ ObjC++,Wall) 669Warn when the compiler reorders code 670 671Wreturn-local-addr 672C ObjC C++ ObjC++ Var(warn_return_local_addr) Init(1) Warning 673Warn about returning a pointer/reference to a local or temporary variable. 674 675Wreturn-type 676C ObjC C++ ObjC++ Var(warn_return_type) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall) 677Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++) 678 679Wselector 680ObjC ObjC++ Var(warn_selector) Warning 681Warn if a selector has multiple methods 682 683Wsequence-point 684C ObjC C++ ObjC++ Var(warn_sequence_point) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall) 685Warn about possible violations of sequence point rules 686 687Wsign-compare 688C ObjC C++ ObjC++ Var(warn_sign_compare) Warning LangEnabledBy(C++ ObjC++,Wall) 689Warn about signed-unsigned comparisons 690 691Wsign-compare 692C ObjC C++ ObjC++ EnabledBy(Wextra) 693; 694 695Wsign-conversion 696C ObjC C++ ObjC++ Var(warn_sign_conversion) LangEnabledBy(C ObjC,Wconversion) 697Warn for implicit type conversions between signed and unsigned integers 698 699Wsign-promo 700C++ ObjC++ Var(warn_sign_promo) Warning 701Warn when overload promotes from unsigned to signed 702 703Wstrict-null-sentinel 704C++ ObjC++ Warning Var(warn_strict_null_sentinel) 705Warn about uncasted NULL used as sentinel 706 707Wstrict-prototypes 708C ObjC Var(warn_strict_prototypes) Warning 709Warn about unprototyped function declarations 710 711Wstrict-aliasing= 712C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 3, 0) 713; 714 715Wstrict-overflow= 716C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0) 717; 718 719Wstrict-selector-match 720ObjC ObjC++ Var(warn_strict_selector_match) Warning 721Warn if type signatures of candidate methods do not match exactly 722 723Wsync-nand 724C C++ Var(warn_sync_nand) Init(1) Warning 725Warn when __sync_fetch_and_nand and __sync_nand_and_fetch built-in functions are used 726 727Wsynth 728C++ ObjC++ Var(warn_synth) Warning 729Deprecated. This switch has no effect 730 731Wsystem-headers 732C ObjC C++ ObjC++ Warning 733; Documented in common.opt 734 735Wtraditional 736C ObjC Var(warn_traditional) Warning 737Warn about features not present in traditional C 738 739Wtraditional-conversion 740C ObjC Var(warn_traditional_conversion) Warning 741Warn of prototypes causing type conversions different from what would happen in the absence of prototype 742 743Wtrigraphs 744C ObjC C++ ObjC++ Warning 745Warn if trigraphs are encountered that might affect the meaning of the program 746 747Wundeclared-selector 748ObjC ObjC++ Var(warn_undeclared_selector) Warning 749Warn about @selector()s without previously declared methods 750 751Wundef 752C ObjC C++ ObjC++ Warning 753Warn if an undefined macro is used in an #if directive 754 755Wuninitialized 756C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall) 757; 758 759Wmaybe-uninitialized 760C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall) 761; 762 763Wunknown-pragmas 764C ObjC C++ ObjC++ Warning Var(warn_unknown_pragmas) LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0) 765Warn about unrecognized pragmas 766 767Wunsuffixed-float-constants 768C ObjC Var(warn_unsuffixed_float_constants) Warning 769Warn about unsuffixed float constants 770 771Wunused 772C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall) 773; documented in common.opt 774 775Wunused-local-typedefs 776C ObjC C++ ObjC++ Var(warn_unused_local_typedefs) Warning EnabledBy(Wunused) 777Warn when typedefs locally defined in a function are not used 778 779Wunused-macros 780C ObjC C++ ObjC++ Var(cpp_warn_unused_macros) Warning 781Warn about macros defined in the main file that are not used 782 783Wunused-result 784C ObjC C++ ObjC++ Var(warn_unused_result) Init(1) Warning 785Warn if a caller of a function, marked with attribute warn_unused_result, does not use its return value 786 787Wvariadic-macros 788C ObjC C++ ObjC++ Var(cpp_warn_variadic_macros) Init(1) Warning 789Warn about using variadic macros 790 791Wvarargs 792C ObjC C++ ObjC++ Warning Var(warn_varargs) Init(1) 793Warn about questionable usage of the macros used to retrieve variable arguments 794 795Wvla 796C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning 797Warn if a variable length array is used 798 799Wvolatile-register-var 800C ObjC C++ ObjC++ Var(warn_volatile_register_var) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall) 801Warn when a register variable is declared volatile 802 803Wvirtual-move-assign 804C++ ObjC++ Var(warn_virtual_move_assign) Warning Init(1) 805Warn if a virtual base has a non-trivial move assignment operator 806 807Wwrite-strings 808C ObjC C++ ObjC++ Var(warn_write_strings) Warning 809In 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. 810 811Wzero-as-null-pointer-constant 812C++ ObjC++ Var(warn_zero_as_null_pointer_constant) Warning 813Warn when a literal '0' is used as null pointer 814 815Wuseless-cast 816C++ ObjC++ Var(warn_useless_cast) Warning 817Warn about useless casts 818 819ansi 820C ObjC C++ ObjC++ 821A synonym for -std=c89 (for C) or -std=c++98 (for C++) 822 823d 824C ObjC C++ ObjC++ Joined 825; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD? 826 827faccess-control 828C++ ObjC++ Var(flag_access_control) Init(1) 829Enforce class member access control semantics 830 831fada-spec-parent= 832C ObjC C++ ObjC++ RejectNegative Joined Var(ada_specs_parent) 833-fada-spec-parent=unit Dump Ada specs as child units of given parent 834 835fall-virtual 836C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 837 838fallow-parameterless-variadic-functions 839C ObjC Var(flag_allow_parameterless_variadic_functions) 840Allow variadic functions without named parameter 841 842falt-external-templates 843C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 844No longer supported 845 846fasm 847C ObjC C++ ObjC++ Var(flag_no_asm, 0) 848Recognize the \"asm\" keyword 849 850; Define extra predefined macros for use in libgcc. 851fbuilding-libgcc 852C ObjC C++ ObjC++ Undocumented Var(flag_building_libgcc) 853 854fbuiltin 855C ObjC C++ ObjC++ Var(flag_no_builtin, 0) 856Recognize built-in functions 857 858fbuiltin- 859C ObjC C++ ObjC++ Joined 860 861fcanonical-system-headers 862C ObjC C++ ObjC++ 863Where shorter, use canonicalized paths to systems headers. 864 865fcilkplus 866C ObjC C++ ObjC++ LTO Report Var(flag_cilkplus) Init(0) 867Enable Cilk Plus 868 869fcond-mismatch 870C ObjC C++ ObjC++ 871Allow the arguments of the '?' operator to have different types 872 873fconserve-space 874C++ ObjC++ Var(flag_conserve_space) 875Does nothing. Preserved for backward compatibility. 876 877fconstant-string-class= 878ObjC ObjC++ Joined MissingArgError(no class name specified with %qs) 879-fconst-string-class=<name> Use class <name> for constant strings 880 881fconstexpr-depth= 882C++ ObjC++ Joined RejectNegative UInteger Var(max_constexpr_depth) Init(512) 883-fconstexpr-depth=<number> Specify maximum constexpr recursion depth 884 885fdebug-cpp 886C ObjC C++ ObjC++ 887Emit debug annotations during preprocessing 888 889fdeduce-init-list 890C++ ObjC++ Var(flag_deduce_init_list) Init(0) 891-fdeduce-init-list enable deduction of std::initializer_list for a template type parameter from a brace-enclosed initializer-list 892 893fdeclone-ctor-dtor 894C++ ObjC++ Var(flag_declone_ctor_dtor) Init(-1) 895Factor complex constructors and destructors to favor space over speed 896 897fdefault-inline 898C++ ObjC++ Ignore 899Does nothing. Preserved for backward compatibility. 900 901fdirectives-only 902C ObjC C++ ObjC++ 903Preprocess directives only. 904 905fdollars-in-identifiers 906C ObjC C++ ObjC++ 907Permit '$' as an identifier character 908 909fdump-ada-spec 910C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec) 911Write all declarations as Ada code transitively 912 913fdump-ada-spec-slim 914C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec_slim) 915Write all declarations as Ada code for the given file only 916 917felide-constructors 918C++ ObjC++ Var(flag_elide_constructors) Init(1) 919 920fenforce-eh-specs 921C++ ObjC++ Var(flag_enforce_eh_specs) Init(1) 922Generate code to check exception specifications 923 924fenum-int-equiv 925C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 926 927fexec-charset= 928C ObjC C++ ObjC++ Joined RejectNegative 929-fexec-charset=<cset> Convert all strings and character constants to character set <cset> 930 931fextended-identifiers 932C ObjC C++ ObjC++ 933Permit universal character names (\\u and \\U) in identifiers 934 935finput-charset= 936C ObjC C++ ObjC++ Joined RejectNegative 937-finput-charset=<cset> Specify the default character set for source files 938 939fextern-tls-init 940C++ ObjC++ Var(flag_extern_tls_init) Init(-1) 941Support dynamic initialization of thread-local variables in a different translation unit 942 943fexternal-templates 944C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 945 946ffor-scope 947C++ ObjC++ Var(flag_new_for_scope) Init(1) 948Scope of for-init-statement variables is local to the loop 949 950ffreestanding 951C ObjC C++ ObjC++ 952Do not assume that standard C libraries and \"main\" exist 953 954fgnu-keywords 955C++ ObjC++ Var(flag_no_gnu_keywords, 0) 956Recognize GNU-defined keywords 957 958fgnu-runtime 959ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime,0) Init(NEXT_OBJC_RUNTIME) 960Generate code for GNU runtime environment 961 962fgnu89-inline 963C ObjC Var(flag_gnu89_inline) Init(-1) 964Use traditional GNU semantics for inline functions 965 966fguiding-decls 967C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 968 969fhandle-exceptions 970C++ ObjC++ Optimization Alias(fexceptions) Warn({-fhandle-exceptions has been renamed -fexceptions (and is now on by default)}) 971 972fhonor-std 973C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 974 975fhosted 976C ObjC 977Assume normal C execution environment 978 979fhuge-objects 980C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 981No longer supported 982 983fimplement-inlines 984C++ ObjC++ Var(flag_implement_inlines) Init(1) 985Export functions even if they can be inlined 986 987fimplicit-inline-templates 988C++ ObjC++ Var(flag_implicit_inline_templates) Init(1) 989Emit implicit instantiations of inline templates 990 991fimplicit-templates 992C++ ObjC++ Var(flag_implicit_templates) Init(1) 993Emit implicit instantiations of templates 994 995ffriend-injection 996C++ ObjC++ Var(flag_friend_injection) 997Inject friend functions into enclosing namespace 998 999fkeep-inline-dllexport 1000C C++ ObjC ObjC++ Var(flag_keep_inline_dllexport) Init(1) Report Condition(TARGET_DLLIMPORT_DECL_ATTRIBUTES) 1001Don't emit dllexported inline functions unless needed 1002 1003flabels-ok 1004C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 1005 1006flax-vector-conversions 1007C ObjC C++ ObjC++ Var(flag_lax_vector_conversions) 1008Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types. 1009 1010fms-extensions 1011C ObjC C++ ObjC++ Var(flag_ms_extensions) 1012Don't warn about uses of Microsoft extensions 1013 1014fmudflap 1015C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 1016 1017fmudflapth 1018C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 1019 1020fmudflapir 1021C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 1022 1023fname-mangling-version- 1024C++ ObjC++ Joined Ignore Warn(switch %qs is no longer supported) 1025 1026fnew-abi 1027C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 1028 1029fnext-runtime 1030ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime) 1031Generate code for NeXT (Apple Mac OS X) runtime environment 1032 1033fnil-receivers 1034ObjC ObjC++ Var(flag_nil_receivers) Init(1) 1035Assume that receivers of Objective-C messages may be nil 1036 1037fnonansi-builtins 1038C++ ObjC++ Var(flag_no_nonansi_builtin, 0) 1039 1040fnonnull-objects 1041C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 1042 1043fnothrow-opt 1044C++ ObjC++ Optimization Var(flag_nothrow_opt) 1045Treat a throw() exception specification as noexcept to improve code size 1046 1047fobjc-abi-version= 1048ObjC ObjC++ LTO Joined Report RejectNegative UInteger Var(flag_objc_abi) 1049Specify which ABI to use for Objective-C family code and meta-data generation. 1050 1051; Generate special '- .cxx_construct' and '- .cxx_destruct' methods 1052; to initialize any non-POD ivars in Objective-C++ classes. 1053fobjc-call-cxx-cdtors 1054ObjC++ Var(flag_objc_call_cxx_cdtors) 1055Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed 1056 1057fobjc-direct-dispatch 1058ObjC ObjC++ Var(flag_objc_direct_dispatch) 1059Allow fast jumps to the message dispatcher 1060 1061; Nonzero means that we will allow new ObjC exception syntax (@throw, 1062; @try, etc.) in source code. 1063fobjc-exceptions 1064ObjC ObjC++ Var(flag_objc_exceptions) 1065Enable Objective-C exception and synchronization syntax 1066 1067fobjc-gc 1068ObjC ObjC++ LTO Var(flag_objc_gc) 1069Enable garbage collection (GC) in Objective-C/Objective-C++ programs 1070 1071fobjc-nilcheck 1072ObjC ObjC++ Var(flag_objc_nilcheck,1) 1073Enable inline checks for nil receivers with the NeXT runtime and ABI version 2. 1074 1075; Nonzero means that we generate NeXT setjmp based exceptions. 1076fobjc-sjlj-exceptions 1077ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1) 1078Enable Objective-C setjmp exception handling runtime 1079 1080fobjc-std=objc1 1081ObjC ObjC++ Var(flag_objc1_only) 1082Conform to the Objective-C 1.0 language as implemented in GCC 4.0 1083 1084fopenmp 1085C ObjC C++ ObjC++ Var(flag_openmp) 1086Enable OpenMP (implies -frecursive in Fortran) 1087 1088fopenmp-simd 1089C ObjC C++ ObjC++ Var(flag_openmp_simd) 1090Enable OpenMP's SIMD directives 1091 1092foperator-names 1093C++ ObjC++ 1094Recognize C++ keywords like \"compl\" and \"xor\" 1095 1096foptional-diags 1097C++ ObjC++ Ignore 1098Does nothing. Preserved for backward compatibility. 1099 1100fpch-deps 1101C ObjC C++ ObjC++ 1102 1103fpch-preprocess 1104C ObjC C++ ObjC++ 1105Look for and use PCH files even when preprocessing 1106 1107fpermissive 1108C++ ObjC++ Var(flag_permissive) 1109Downgrade conformance errors to warnings 1110 1111fplan9-extensions 1112C ObjC Var(flag_plan9_extensions) 1113Enable Plan 9 language extensions 1114 1115fpreprocessed 1116C ObjC C++ ObjC++ 1117Treat the input file as already preprocessed 1118 1119ftrack-macro-expansion 1120C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger 1121; converted into ftrack-macro-expansion= 1122 1123ftrack-macro-expansion= 1124C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger 1125-ftrack-macro-expansion=<0|1|2> Track locations of tokens coming from macro expansion and display them in error messages 1126 1127fpretty-templates 1128C++ ObjC++ Var(flag_pretty_templates) Init(1) 1129-fno-pretty-templates Do not pretty-print template specializations as the template signature followed by the arguments 1130 1131freplace-objc-classes 1132ObjC ObjC++ LTO Var(flag_replace_objc_classes) 1133Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime 1134 1135frepo 1136C++ ObjC++ 1137Enable automatic template instantiation 1138 1139frtti 1140C++ ObjC++ Optimization Var(flag_rtti) Init(1) 1141Generate run time type descriptor information 1142 1143fshort-double 1144C ObjC C++ ObjC++ LTO Optimization Var(flag_short_double) 1145Use the same size for double as for float 1146 1147fshort-enums 1148C ObjC C++ ObjC++ Optimization Var(flag_short_enums) 1149Use the narrowest integer type possible for enumeration types 1150 1151fshort-wchar 1152C ObjC C++ ObjC++ Optimization Var(flag_short_wchar) 1153Force the underlying type for \"wchar_t\" to be \"unsigned short\" 1154 1155fsigned-bitfields 1156C ObjC C++ ObjC++ Var(flag_signed_bitfields) Init(1) 1157When \"signed\" or \"unsigned\" is not given make the bitfield signed 1158 1159fsigned-char 1160C ObjC C++ ObjC++ LTO Var(flag_signed_char) 1161Make \"char\" signed by default 1162 1163fsquangle 1164C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 1165 1166fstats 1167C++ ObjC++ Var(flag_detailed_statistics) 1168Display statistics accumulated during compilation 1169 1170fstrict-enums 1171C++ ObjC++ Optimization Var(flag_strict_enums) 1172Assume that values of enumeration type are always within the minimum range of that type 1173 1174fstrict-prototype 1175C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 1176 1177ftabstop= 1178C ObjC C++ ObjC++ Joined RejectNegative UInteger 1179-ftabstop=<number> Distance between tab stops for column reporting 1180 1181ftemplate-backtrace-limit= 1182C++ ObjC++ Joined RejectNegative UInteger Var(template_backtrace_limit) Init(10) 1183Set the maximum number of template instantiation notes for a single warning or error 1184 1185ftemplate-depth- 1186C++ ObjC++ Joined RejectNegative Undocumented Alias(ftemplate-depth=) 1187 1188ftemplate-depth= 1189C++ ObjC++ Joined RejectNegative UInteger 1190-ftemplate-depth=<number> Specify maximum template instantiation depth 1191 1192fthis-is-variable 1193C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 1194 1195fthreadsafe-statics 1196C++ ObjC++ Optimization Var(flag_threadsafe_statics) Init(1) 1197-fno-threadsafe-statics Do not generate thread-safe code for initializing local statics 1198 1199funsigned-bitfields 1200C ObjC C++ ObjC++ Var(flag_signed_bitfields, 0) 1201When \"signed\" or \"unsigned\" is not given make the bitfield unsigned 1202 1203funsigned-char 1204C ObjC C++ ObjC++ LTO Var(flag_signed_char, 0) 1205Make \"char\" unsigned by default 1206 1207fuse-cxa-atexit 1208C++ ObjC++ Var(flag_use_cxa_atexit) Init(DEFAULT_USE_CXA_ATEXIT) 1209Use __cxa_atexit to register destructors 1210 1211fuse-cxa-get-exception-ptr 1212C++ ObjC++ Var(flag_use_cxa_get_exception_ptr) Init(2) 1213Use __cxa_get_exception_ptr in exception handling 1214 1215fvisibility-inlines-hidden 1216C++ ObjC++ 1217Marks all inlined functions and methods as having hidden visibility 1218 1219fvisibility-ms-compat 1220C++ ObjC++ Var(flag_visibility_ms_compat) 1221Changes visibility to match Microsoft Visual Studio by default 1222 1223fvtable-gc 1224C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 1225No longer supported 1226 1227fvtable-thunks 1228C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 1229No longer supported 1230 1231fweak 1232C++ ObjC++ Var(flag_weak) Init(1) 1233Emit common-like symbols as weak symbols 1234 1235fwide-exec-charset= 1236C ObjC C++ ObjC++ Joined RejectNegative 1237-fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset> 1238 1239fworking-directory 1240C ObjC C++ ObjC++ Var(flag_working_directory) Init(-1) 1241Generate a #line directive pointing at the current working directory 1242 1243fxref 1244C++ ObjC++ Ignore Warn(switch %qs is no longer supported) 1245No longer supported 1246 1247fzero-link 1248ObjC ObjC++ Var(flag_zero_link) 1249Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode 1250 1251gen-decls 1252ObjC ObjC++ Var(flag_gen_declaration) 1253Dump declarations to a .decl file 1254 1255femit-struct-debug-baseonly 1256C ObjC C++ ObjC++ 1257-femit-struct-debug-baseonly Aggressive reduced debug info for structs 1258 1259femit-struct-debug-reduced 1260C ObjC C++ ObjC++ 1261-femit-struct-debug-reduced Conservative reduced debug info for structs 1262 1263femit-struct-debug-detailed= 1264C ObjC C++ ObjC++ Joined 1265-femit-struct-debug-detailed=<spec-list> Detailed reduced debug info for structs 1266 1267fext-numeric-literals 1268C++ ObjC++ 1269Interpret imaginary, fixed-point, or other gnu number suffix as the corresponding 1270number literal rather than a user-defined number literal. 1271 1272idirafter 1273C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs) 1274-idirafter <dir> Add <dir> to the end of the system include path 1275 1276imacros 1277C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs) 1278-imacros <file> Accept definition of macros in <file> 1279 1280imultilib 1281C ObjC C++ ObjC++ Joined Separate 1282-imultilib <dir> Set <dir> to be the multilib include subdirectory 1283 1284include 1285C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs) 1286-include <file> Include the contents of <file> before other files 1287 1288iprefix 1289C ObjC C++ ObjC++ Joined Separate 1290-iprefix <path> Specify <path> as a prefix for next two options 1291 1292isysroot 1293C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs) 1294-isysroot <dir> Set <dir> to be the system root directory 1295 1296isystem 1297C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs) 1298-isystem <dir> Add <dir> to the start of the system include path 1299 1300iquote 1301C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs) 1302-iquote <dir> Add <dir> to the end of the quote include path 1303 1304iwithprefix 1305C ObjC C++ ObjC++ Joined Separate 1306-iwithprefix <dir> Add <dir> to the end of the system include path 1307 1308iwithprefixbefore 1309C ObjC C++ ObjC++ Joined Separate 1310-iwithprefixbefore <dir> Add <dir> to the end of the main include path 1311 1312lang-asm 1313C Undocumented RejectDriver 1314 1315no-integrated-cpp 1316Driver 1317 1318nostdinc 1319C ObjC C++ ObjC++ 1320Do not search standard system include directories (those specified with -isystem will still be used) 1321 1322nostdinc++ 1323C++ ObjC++ 1324Do not search standard system include directories for C++ 1325 1326o 1327C ObjC C++ ObjC++ Joined Separate 1328; Documented in common.opt 1329 1330pedantic 1331C ObjC C++ ObjC++ Alias(Wpedantic) 1332; Documented in common.opt 1333 1334print-objc-runtime-info 1335ObjC ObjC++ 1336Generate C header of platform-specific features 1337 1338remap 1339C ObjC C++ ObjC++ 1340Remap file names when including files 1341 1342std=c++98 1343C++ ObjC++ 1344Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum 1345 1346std=c++03 1347C++ ObjC++ Alias(std=c++98) 1348Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum 1349 1350std=c++11 1351C++ ObjC++ 1352Conform to the ISO 2011 C++ standard 1353 1354std=c++0x 1355C++ ObjC++ Alias(std=c++11) Undocumented 1356Deprecated in favor of -std=c++11 1357 1358std=c++1y 1359C++ ObjC++ 1360Conform to the ISO 2014(?) C++ draft standard (experimental and incomplete support) 1361 1362std=c++14 1363C++ ObjC++ Alias(std=c++1y) Undocumented 1364 1365std=c11 1366C ObjC 1367Conform to the ISO 2011 C standard (experimental and incomplete support) 1368 1369std=c1x 1370C ObjC Alias(std=c11) 1371Deprecated in favor of -std=c11 1372 1373std=c89 1374C ObjC Alias(std=c90) 1375Conform to the ISO 1990 C standard 1376 1377std=c90 1378C ObjC 1379Conform to the ISO 1990 C standard 1380 1381std=c99 1382C ObjC 1383Conform to the ISO 1999 C standard 1384 1385std=c9x 1386C ObjC Alias(std=c99) 1387Deprecated in favor of -std=c99 1388 1389std=gnu++98 1390C++ ObjC++ 1391Conform to the ISO 1998 C++ standard revised by the 2003 technical 1392corrigendum with GNU extensions 1393 1394std=gnu++03 1395C++ ObjC++ Alias(std=gnu++98) 1396Conform to the ISO 1998 C++ standard revised by the 2003 technical 1397corrigendum with GNU extensions 1398 1399std=gnu++11 1400C++ ObjC++ 1401Conform to the ISO 2011 C++ standard with GNU extensions (experimental and incomplete support) 1402 1403std=gnu++0x 1404C++ ObjC++ Alias(std=gnu++11) 1405Deprecated in favor of -std=gnu++11 1406 1407std=gnu++1y 1408C++ ObjC++ 1409Conform to the ISO 201y(7?) C++ draft standard with GNU extensions (experimental and incomplete support) 1410 1411std=gnu++14 1412C++ ObjC++ Alias(std=gnu++1y) Undocumented 1413 1414std=gnu11 1415C ObjC 1416Conform to the ISO 2011 C standard with GNU extensions (experimental and incomplete support) 1417 1418std=gnu1x 1419C ObjC Alias(std=gnu11) 1420Deprecated in favor of -std=gnu11 1421 1422std=gnu89 1423C ObjC Alias(std=gnu90) 1424Conform to the ISO 1990 C standard with GNU extensions 1425 1426std=gnu90 1427C ObjC 1428Conform to the ISO 1990 C standard with GNU extensions 1429 1430std=gnu99 1431C ObjC 1432Conform to the ISO 1999 C standard with GNU extensions 1433 1434std=gnu9x 1435C ObjC Alias(std=gnu99) 1436Deprecated in favor of -std=gnu99 1437 1438std=iso9899:1990 1439C ObjC Alias(std=c90) 1440Conform to the ISO 1990 C standard 1441 1442std=iso9899:199409 1443C ObjC 1444Conform to the ISO 1990 C standard as amended in 1994 1445 1446std=iso9899:1999 1447C ObjC Alias(std=c99) 1448Conform to the ISO 1999 C standard 1449 1450std=iso9899:199x 1451C ObjC Alias(std=c99) 1452Deprecated in favor of -std=iso9899:1999 1453 1454std=iso9899:2011 1455C ObjC Alias(std=c11) 1456Conform to the ISO 2011 C standard (experimental and incomplete support) 1457 1458traditional 1459Driver 1460 1461traditional-cpp 1462C ObjC C++ ObjC++ 1463Enable traditional preprocessing 1464 1465trigraphs 1466C ObjC C++ ObjC++ 1467-trigraphs Support ISO C trigraphs 1468 1469undef 1470C ObjC C++ ObjC++ Var(flag_undef) 1471Do not predefine system-specific and GCC-specific macros 1472 1473v 1474C ObjC C++ ObjC++ 1475; Documented in common.opt 1476 1477w 1478C ObjC C++ ObjC++ 1479; Documented in common.opt 1480 1481; This comment is to ensure we retain the blank line above. 1482