gcc/c-family/c.opt

   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
  24 Language
  25 C
  26
  27 Language
  28 ObjC
  29
  30 Language
  31 C++
  32
  33 Language
  34 ObjC++
  35
  36 -all-warnings
  37 C ObjC C++ ObjC++ Warning Alias(Wall)
  38
  39 -ansi
  40 C ObjC C++ ObjC++ Alias(ansi)
  41
  42 -assert
  43 C ObjC C++ ObjC++ Separate Alias(A) MissingArgError(assertion missing after %qs)
  44
  45 -assert=
  46 C ObjC C++ ObjC++ Joined Alias(A) MissingArgError(assertion missing after %qs)
  47
  48 -comments
  49 C ObjC C++ ObjC++ Alias(C)
  50
  51 -comments-in-macros
  52 C ObjC C++ ObjC++ Alias(CC)
  53
  54 -define-macro
  55 C ObjC C++ ObjC++ Separate Alias(D) MissingArgError(macro name missing after %qs)
  56
  57 -define-macro=
  58 C ObjC C++ ObjC++ Joined Alias(D) MissingArgError(macro name missing after %qs)
  59
  60 -dependencies
  61 C ObjC C++ ObjC++ Alias(M)
  62
  63 -dump
  64 C ObjC C++ ObjC++ Separate Alias(d)
  65
  66 -dump=
  67 C ObjC C++ ObjC++ Joined Alias(d)
  68
  69 -imacros
  70 C ObjC C++ ObjC++ Separate Alias(imacros) MissingArgError(missing filename after %qs)
  71
  72 -imacros=
  73 C ObjC C++ ObjC++ Joined Alias(imacros) MissingArgError(missing filename after %qs)
  74
  75 -include
  76 C ObjC C++ ObjC++ Separate Alias(include) MissingArgError(missing filename after %qs)
  77
  78 -include=
  79 C ObjC C++ ObjC++ Joined Alias(include) MissingArgError(missing filename after %qs)
  80
  81 -include-barrier
  82 C ObjC C++ ObjC++ Alias(I, -)
  83
  84 -include-directory
  85 C ObjC C++ ObjC++ Separate Alias(I) MissingArgError(missing path after %qs)
  86
  87 -include-directory=
  88 C ObjC C++ ObjC++ Joined Alias(I) MissingArgError(missing path after %qs)
  89
  90 -include-directory-after
  91 C ObjC C++ ObjC++ Separate Alias(idirafter) MissingArgError(missing path after %qs)
  92
  93 -include-directory-after=
  94 C ObjC C++ ObjC++ Joined Alias(idirafter) MissingArgError(missing path after %qs)
  95
  96 -include-prefix
  97 C ObjC C++ ObjC++ Separate Alias(iprefix)
  98
  99 -include-prefix=
 100 C ObjC C++ ObjC++ JoinedOrMissing Alias(iprefix)
 101
 102 -include-with-prefix
 103 C ObjC C++ ObjC++ Separate Alias(iwithprefix)
 104
 105 -include-with-prefix=
 106 C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefix)
 107
 108 -include-with-prefix-after
 109 C ObjC C++ ObjC++ Separate Alias(iwithprefix)
 110
 111 -include-with-prefix-after=
 112 C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefix)
 113
 114 -include-with-prefix-before
 115 C ObjC C++ ObjC++ Separate Alias(iwithprefixbefore)
 116
 117 -include-with-prefix-before=
 118 C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefixbefore)
 119
 120 -no-integrated-cpp
 121 Driver Alias(no-integrated-cpp)
 122
 123 -no-line-commands
 124 C ObjC C++ ObjC++ Alias(P)
 125
 126 -no-standard-includes
 127 C ObjC C++ ObjC++ Alias(nostdinc)
 128
 129 -no-warnings
 130 C ObjC C++ ObjC++ Alias(w)
 131
 132 -output
 133 C ObjC C++ ObjC++ Separate Alias(o)
 134
 135 -output=
 136 C ObjC C++ ObjC++ Joined Alias(o)
 137
 138 -output-pch=
 139 C ObjC C++ ObjC++ Joined Separate
 140
 141 -pedantic
 142 C ObjC C++ ObjC++ Alias(pedantic)
 143
 144 -preprocess
 145 C ObjC C++ ObjC++ Undocumented Alias(E)
 146
 147 -print-missing-file-dependencies
 148 C ObjC C++ ObjC++ Alias(MG)
 149
 150 -trace-includes
 151 C ObjC C++ ObjC++ Alias(H)
 152
 153 -traditional
 154 Driver Alias(traditional)
 155
 156 -traditional-cpp
 157 C ObjC C++ ObjC++ Alias(traditional-cpp)
 158
 159 -trigraphs
 160 C ObjC C++ ObjC++ Alias(trigraphs)
 161
 162 -undefine-macro
 163 C ObjC C++ ObjC++ Separate Alias(U) MissingArgError(macro name missing after %qs)
 164
 165 -undefine-macro=
 166 C ObjC C++ ObjC++ Joined Alias(U) MissingArgError(macro name missing after %qs)
 167
 168 -user-dependencies
 169 C ObjC C++ ObjC++ Alias(MM)
 170
 171 -verbose
 172 Common C ObjC C++ ObjC++ Alias(v)
 173
 174 -write-dependencies
 175 C ObjC C++ ObjC++ NoDriverArg Separate Alias(MD) MissingArgError(missing filename after %qs)
 176
 177 -write-user-dependencies
 178 C ObjC C++ ObjC++ NoDriverArg Separate Alias(MMD) MissingArgError(missing filename after %qs)
 179
 180 A
 181 C 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
 184 C
 185 C ObjC C++ ObjC++
 186 Do not discard comments
 187
 188 CC
 189 C ObjC C++ ObjC++
 190 Do not discard comments in macro expansions
 191
 192 D
 193 C 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
 196 E
 197 C ObjC C++ ObjC++ Undocumented Var(flag_preprocess_only)
 198
 199 F
 200 Driver 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
 203 H
 204 C ObjC C++ ObjC++
 205 Print the name of header files as they are used
 206
 207 I
 208 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
 209 -I <dir>        Add <dir> to the end of the main include path
 210
 211 M
 212 C ObjC C++ ObjC++
 213 Generate make dependencies
 214
 215 MD
 216 C ObjC C++ ObjC++ NoDriverArg Separate MissingArgError(missing filename after %qs)
 217 Generate make dependencies and compile
 218
 219 MF
 220 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
 221 -MF <file>      Write dependency output to the given file
 222
 223 MG
 224 C ObjC C++ ObjC++
 225 Treat missing header files as generated files
 226
 227 MM
 228 C ObjC C++ ObjC++
 229 Like -M but ignore system header files
 230
 231 MMD
 232 C ObjC C++ ObjC++ NoDriverArg Separate MissingArgError(missing filename after %qs)
 233 Like -MD but ignore system header files
 234
 235 MP
 236 C ObjC C++ ObjC++
 237 Generate phony targets for all headers
 238
 239 MQ
 240 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing makefile target after %qs)
 241 -MQ <target>    Add a MAKE-quoted target
 242
 243 MT
 244 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing makefile target after %qs)
 245 -MT <target>    Add an unquoted target
 246
 247 P
 248 C ObjC C++ ObjC++
 249 Do not generate #line directives
 250
 251 U
 252 C ObjC C++ ObjC++ Joined Separate MissingArgError(macro name missing after %qs)
 253 -U<macro>       Undefine <macro>
 254
 255 Wabi
 256 C ObjC C++ ObjC++ LTO Var(warn_abi) Warning
 257 Warn about things that will change when compiling with an ABI-compliant compiler
 258
 259 Wabi=
 260 C ObjC C++ ObjC++ LTO Joined RejectNegative UInteger Warning
 261 Warn about things that change between the current -fabi-version and the specified version
 262
 263 Wabi-tag
 264 C++ ObjC++ Var(warn_abi_tag) Warning
 265 Warn if a subobject has an abi_tag attribute that the complete object type does not have
 266
 267 Wpsabi
 268 C ObjC C++ ObjC++ LTO Var(warn_psabi) Init(1) Undocumented
 269
 270 Waddress
 271 C ObjC C++ ObjC++ Var(warn_address) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 272 Warn about suspicious uses of memory addresses
 273
 274 Wall
 275 C ObjC C++ ObjC++ Warning
 276 Enable most warning messages
 277
 278 Warray-bounds
 279 LangEnabledBy(C ObjC C++ ObjC++,Wall)
 280 ; in common.opt
 281
 282 Wassign-intercept
 283 ObjC ObjC++ Var(warn_assign_intercept) Warning
 284 Warn whenever an Objective-C assignment is being intercepted by the garbage collector
 285
 286 Wbad-function-cast
 287 C ObjC Var(warn_bad_function_cast) Warning
 288 Warn about casting functions to incompatible types
 289
 290 Wbuiltin-macro-redefined
 291 C ObjC C++ ObjC++ Warning
 292 Warn when a built-in preprocessor macro is undefined or redefined
 293
 294 Wc90-c99-compat
 295 C ObjC Var(warn_c90_c99_compat) Init(-1) Warning
 296 Warn about features not present in ISO C90, but present in ISO C99
 297
 298 Wc99-c11-compat
 299 C ObjC Var(warn_c99_c11_compat) Init(-1) Warning
 300 Warn about features not present in ISO C99, but present in ISO C11
 301
 302 Wc++-compat
 303 C ObjC Var(warn_cxx_compat) Warning
 304 Warn about C constructs that are not in the common subset of C and C++
 305
 306 Wc++0x-compat
 307 C++ ObjC++ Var(warn_cxx0x_compat) Warning LangEnabledBy(C++ ObjC++,Wall)
 308 Deprecated in favor of -Wc++11-compat
 309
 310 Wc++11-compat
 311 C++ ObjC++ Warning Alias(Wc++0x-compat)
 312 Warn about C++ constructs whose meaning differs between ISO C++ 1998 and ISO C++ 2011
 313
 314 Wcast-qual
 315 C ObjC C++ ObjC++ Var(warn_cast_qual) Warning
 316 Warn about casts which discard qualifiers
 317
 318 Wchar-subscripts
 319 C ObjC C++ ObjC++ Var(warn_char_subscripts) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 320 Warn about subscripts whose type is \"char\"
 321
 322 Wclobbered
 323 C ObjC C++ ObjC++ Var(warn_clobbered) Warning EnabledBy(Wextra)
 324 Warn about variables that might be changed by \"longjmp\" or \"vfork\"
 325
 326 Wcomment
 327 C ObjC C++ ObjC++ Warning
 328 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
 329
 330 Wcomments
 331 C ObjC C++ ObjC++ Warning Alias(Wcomment)
 332 Synonym for -Wcomment
 333
 334 Wconditionally-supported
 335 C++ ObjC++ Var(warn_conditionally_supported) Warning
 336 Warn for conditionally-supported constructs
 337
 338 Wconversion
 339 C ObjC C++ ObjC++ Var(warn_conversion) Warning
 340 Warn for implicit type conversions that may change a value
 341
 342 Wconversion-null
 343 C++ ObjC++ Var(warn_conversion_null) Init(1) Warning
 344 Warn for converting NULL from/to a non-pointer type
 345
 346 Wctor-dtor-privacy
 347 C++ ObjC++ Var(warn_ctor_dtor_privacy) Warning
 348 Warn when all constructors and destructors are private
 349
 350 Wdeclaration-after-statement
 351 C ObjC Var(warn_declaration_after_statement) Init(-1) Warning
 352 Warn when a declaration is found after a statement
 353
 354 Wdelete-incomplete
 355 C++ ObjC++ Var(warn_delete_incomplete) Init(1) Warning
 356 Warn when deleting a pointer to incomplete type
 357
 358 Wdelete-non-virtual-dtor
 359 C++ ObjC++ Var(warn_delnonvdtor) Warning LangEnabledBy(C++ ObjC++,Wall)
 360 Warn about deleting polymorphic objects with non-virtual destructors
 361
 362 Wdelete-non-virtual-dtor
 363 LangEnabledBy(C++ ObjC++,Weffc++)
 364 ;
 365
 366 Wdeprecated
 367 C C++ ObjC ObjC++ Var(warn_deprecated) Init(1) Warning
 368 Warn if a deprecated compiler feature, class, method, or field is used
 369
 370 Wdesignated-init
 371 C ObjC Var(warn_designated_init) Init(1) Warning
 372 Warn about positional initialization of structs requiring designated initializers
 373
 374 Wdiscarded-qualifiers
 375 C ObjC Var(warn_discarded_qualifiers) Init(1) Warning
 376 Warn if type qualifiers on pointers are discarded
 377
 378 Wdiv-by-zero
 379 C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1) Warning
 380 Warn about compile-time integer division by zero
 381
 382 Weffc++
 383 C++ ObjC++ Var(warn_ecpp) Warning
 384 Warn about violations of Effective C++ style rules
 385
 386 Wempty-body
 387 C ObjC C++ ObjC++ Var(warn_empty_body) Warning EnabledBy(Wextra)
 388 Warn about an empty body in an if or else statement
 389
 390 Wendif-labels
 391 C ObjC C++ ObjC++ Warning
 392 Warn about stray tokens after #elif and #endif
 393
 394 Wenum-compare
 395 C ObjC C++ ObjC++ Var(warn_enum_compare) Init(-1) Warning LangEnabledBy(C ObjC,Wall)
 396 Warn about comparison of different enum types
 397
 398 Wenum-compare
 399 LangEnabledBy(C ObjC,Wc++-compat)
 400 ;
 401
 402 Werror
 403 C ObjC C++ ObjC++
 404 ; Documented in common.opt
 405
 406 Werror-implicit-function-declaration
 407 C ObjC RejectNegative Warning Alias(Werror=, implicit-function-declaration)
 408 This switch is deprecated; use -Werror=implicit-function-declaration instead
 409
 410 Wfloat-conversion
 411 C ObjC C++ ObjC++ Var(warn_float_conversion) LangEnabledBy(C ObjC C++ ObjC++,Wconversion)
 412 Warn for implicit type conversions that cause loss of floating point precision
 413
 414 Wfloat-equal
 415 C ObjC C++ ObjC++ Var(warn_float_equal) Warning
 416 Warn if testing floating point numbers for equality
 417
 418 Wformat
 419 C ObjC C++ ObjC++ Warning Alias(Wformat=, 1, 0)
 420 Warn about printf/scanf/strftime/strfmon format string anomalies
 421
 422 Wformat-contains-nul
 423 C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
 424 Warn about format strings that contain NUL bytes
 425
 426 Wformat-extra-args
 427 C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
 428 Warn if passing too many arguments to a function for its format string
 429
 430 Wformat-nonliteral
 431 C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
 432 Warn about format strings that are not literals
 433
 434 Wformat-security
 435 C ObjC C++ ObjC++ Var(warn_format_security) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
 436 Warn about possible security problems with format functions
 437
 438 Wformat-signedness
 439 C ObjC C++ ObjC++ Var(warn_format_signedness) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
 440 Warn about sign differences with format functions
 441
 442 Wformat-y2k
 443 C ObjC C++ ObjC++ Var(warn_format_y2k) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 2, 0)
 444 Warn about strftime formats yielding 2-digit years
 445
 446 Wformat-zero-length
 447 C ObjC C++ ObjC++ Var(warn_format_zero_length) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1, 0)
 448 Warn about zero-length formats
 449
 450 Wformat=
 451 C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_format) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
 452 Warn about printf/scanf/strftime/strfmon format string anomalies
 453
 454 Wignored-qualifiers
 455 C C++ Var(warn_ignored_qualifiers) Warning EnabledBy(Wextra)
 456 Warn whenever type qualifiers are ignored.
 457
 458 Wincompatible-pointer-types
 459 C ObjC Var(warn_incompatible_pointer_types) Init(1) Warning
 460 Warn when there is a conversion between pointers that have incompatible types
 461
 462 Winit-self
 463 C ObjC C++ ObjC++ Var(warn_init_self) Warning LangEnabledBy(C++ ObjC++,Wall)
 464 Warn about variables which are initialized to themselves
 465
 466 Wimplicit
 467 C ObjC Var(warn_implicit) Warning LangEnabledBy(C ObjC,Wall)
 468 Warn about implicit declarations
 469
 470 Wdouble-promotion
 471 C ObjC C++ ObjC++ Var(warn_double_promotion) Warning
 472 Warn about implicit conversions from \"float\" to \"double\"
 473
 474 Wimplicit-function-declaration
 475 C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning LangEnabledBy(C ObjC,Wimplicit)
 476 Warn about implicit function declarations
 477
 478 Wimplicit-int
 479 C ObjC Var(warn_implicit_int) Warning LangEnabledBy(C ObjC,Wimplicit)
 480 Warn when a declaration does not specify a type
 481
 482 Wimport
 483 C ObjC C++ ObjC++ Undocumented Ignore
 484
 485 Winherited-variadic-ctor
 486 C++ ObjC++ Var(warn_inh_var_ctor) Init(1) Warning
 487 Warn about C++11 inheriting constructors when the base has a variadic constructor
 488
 489 Wint-conversion
 490 C ObjC Var(warn_int_conversion) Init(1) Warning
 491 Warn about incompatible integer to pointer and pointer to integer conversions
 492
 493 Wint-to-pointer-cast
 494 C ObjC C++ ObjC++ Var(warn_int_to_pointer_cast) Init(1) Warning
 495 Warn when there is a cast to a pointer from an integer of a different size
 496
 497 Winvalid-offsetof
 498 C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning
 499 Warn about invalid uses of the \"offsetof\" macro
 500
 501 Winvalid-pch
 502 C ObjC C++ ObjC++ Warning
 503 Warn about PCH files that are found but not used
 504
 505 Wjump-misses-init
 506 C ObjC Var(warn_jump_misses_init) Warning LangEnabledby(C ObjC,Wc++-compat)
 507 Warn when a jump misses a variable initialization
 508
 509 Wliteral-suffix
 510 C++ ObjC++ Warning
 511 Warn when a string or character literal is followed by a ud-suffix which does not begin with an underscore.
 512
 513 Wlogical-op
 514 C ObjC C++ ObjC++ Var(warn_logical_op) Init(0) Warning
 515 Warn when a logical operator is suspiciously always evaluating to true or false
 516
 517 Wlogical-not-parentheses
 518 C ObjC C++ ObjC++ Var(warn_logical_not_paren) Warning
 519 Warn when logical not is used on the left hand side operand of a comparison
 520
 521 Wlong-long
 522 C ObjC C++ ObjC++ Var(warn_long_long) Init(-1) Warning
 523 Do not warn about using \"long long\" when -pedantic
 524
 525 Wmain
 526 C ObjC C++ ObjC++ Var(warn_main) Init(-1) Warning LangEnabledBy(C ObjC,Wall, 2, 0)
 527 Warn about suspicious declarations of \"main\"
 528
 529 Wmain
 530 LangEnabledBy(C ObjC C++ ObjC++,Wpedantic, 2, 0)
 531 ;
 532
 533 Wmemset-transposed-args
 534 C ObjC C++ ObjC++ Var(warn_memset_transposed_args) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 535 Warn about suspicious calls to memset where the third argument is constant literal zero and the second is not
 536
 537 Wmissing-braces
 538 C ObjC C++ ObjC++ Var(warn_missing_braces) Warning LangEnabledBy(C ObjC,Wall)
 539 Warn about possibly missing braces around initializers
 540
 541 Wmissing-declarations
 542 C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning
 543 Warn about global functions without previous declarations
 544
 545 Wmissing-field-initializers
 546 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Warning EnabledBy(Wextra)
 547 Warn about missing fields in struct initializers
 548
 549 Wsizeof-pointer-memaccess
 550 C ObjC C++ ObjC++ Var(warn_sizeof_pointer_memaccess) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 551 Warn about suspicious length parameters to certain string functions if the argument uses sizeof
 552
 553 Wsizeof-array-argument
 554 C ObjC C++ ObjC++ Var(warn_sizeof_array_argument) Warning Init(1)
 555 Warn when sizeof is applied on a parameter declared as an array
 556
 557 Wsuggest-attribute=format
 558 C ObjC C++ ObjC++ Var(warn_suggest_attribute_format) Warning
 559 Warn about functions which might be candidates for format attributes
 560
 561 Wswitch
 562 C ObjC C++ ObjC++ Var(warn_switch) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 563 Warn about enumerated switches, with no default, missing a case
 564
 565 Wswitch-default
 566 C ObjC C++ ObjC++ Var(warn_switch_default) Warning
 567 Warn about enumerated switches missing a \"default:\" statement
 568
 569 Wswitch-enum
 570 C ObjC C++ ObjC++ Var(warn_switch_enum) Warning
 571 Warn about all enumerated switches missing a specific case
 572
 573 Wswitch-bool
 574 C ObjC C++ ObjC++ Var(warn_switch_bool) Warning Init(1)
 575 Warn about switches with boolean controlling expression
 576
 577 Wmissing-format-attribute
 578 C ObjC C++ ObjC++ Alias(Wsuggest-attribute=format)
 579 ;
 580
 581 Wmissing-include-dirs
 582 C ObjC C++ ObjC++ Warning
 583 Warn about user-specified include directories that do not exist
 584
 585 Wmissing-parameter-type
 586 C ObjC Var(warn_missing_parameter_type) Warning EnabledBy(Wextra)
 587 Warn about function parameters declared without a type specifier in K&R-style functions
 588
 589 Wmissing-prototypes
 590 C ObjC Var(warn_missing_prototypes) Warning
 591 Warn about global functions without prototypes
 592
 593 Wmudflap
 594 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
 595
 596 Wmultichar
 597 C ObjC C++ ObjC++ Warning
 598 Warn about use of multi-character character constants
 599
 600 Wnarrowing
 601 C ObjC C++ ObjC++ Warning Var(warn_narrowing) Init(-1) LangEnabledBy(C++ ObjC++,Wall)
 602 Warn about narrowing conversions within { } that are ill-formed in C++11
 603
 604 Wnarrowing
 605 C ObjC C++ ObjC++ LangEnabledBy(C++ ObjC++,Wc++0x-compat)
 606 ;
 607
 608 Wnested-externs
 609 C ObjC Var(warn_nested_externs) Warning
 610 Warn about \"extern\" declarations not at file scope
 611
 612 Wnoexcept
 613 C++ ObjC++ Var(warn_noexcept) Warning
 614 Warn when a noexcept expression evaluates to false even though the expression can't actually throw
 615
 616 Wnon-template-friend
 617 C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning
 618 Warn when non-templatized friend functions are declared within a template
 619
 620 Wnon-virtual-dtor
 621 C++ ObjC++ Var(warn_nonvdtor) Warning LangEnabledBy(C++ ObjC++,Weffc++)
 622 Warn about non-virtual destructors
 623
 624 Wnonnull
 625 C ObjC C++ ObjC++ Var(warn_nonnull) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1,0)
 626 Warn about NULL being passed to argument slots marked as requiring non-NULL
 627
 628 Wnonnull
 629 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
 630 ;
 631
 632 Wnormalized=
 633 C ObjC C++ ObjC++ Joined Warning
 634 -Wnormalized=<id|nfc|nfkc>      Warn about non-normalised Unicode strings
 635
 636 Wold-style-cast
 637 C++ ObjC++ Var(warn_old_style_cast) Warning
 638 Warn if a C-style cast is used in a program
 639
 640 Wold-style-declaration
 641 C ObjC Var(warn_old_style_declaration) Warning EnabledBy(Wextra)
 642 Warn for obsolescent usage in a declaration
 643
 644 Wold-style-definition
 645 C ObjC Var(warn_old_style_definition) Warning
 646 Warn if an old-style parameter definition is used
 647
 648 Wopenmp-simd
 649 C C++ Var(warn_openmp_simd) Warning LangEnabledBy(C C++,Wall)
 650 Warn if a simd directive is overridden by the vectorizer cost model
 651
 652 Woverlength-strings
 653 C ObjC C++ ObjC++ Var(warn_overlength_strings) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
 654 Warn if a string is longer than the maximum portable length specified by the standard
 655
 656 Woverloaded-virtual
 657 C++ ObjC++ Var(warn_overloaded_virtual) Warning
 658 Warn about overloaded virtual function names
 659
 660 Woverride-init
 661 C ObjC Var(warn_override_init) Warning EnabledBy(Wextra)
 662 Warn about overriding initializers without side effects
 663
 664 Wpacked-bitfield-compat
 665 C ObjC C++ ObjC++ Var(warn_packed_bitfield_compat) Init(-1) Warning
 666 Warn about packed bit-fields whose offset changed in GCC 4.4
 667
 668 Wparentheses
 669 C ObjC C++ ObjC++ Var(warn_parentheses) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 670 Warn about possibly missing parentheses
 671
 672 Wpedantic
 673 C ObjC C++ ObjC++ Warning
 674 ; Documented in common.opt
 675
 676 Wpmf-conversions
 677 C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning
 678 Warn when converting the type of pointers to member functions
 679
 680 Wpointer-arith
 681 C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
 682 Warn about function pointer arithmetic
 683
 684 Wpointer-sign
 685 C ObjC Var(warn_pointer_sign) Warning LangEnabledBy(C ObjC,Wall)
 686 Warn when a pointer differs in signedness in an assignment
 687
 688 Wpointer-sign
 689 C ObjC LangEnabledBy(C ObjC,Wpedantic)
 690 ;
 691
 692 Wpointer-to-int-cast
 693 C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning
 694 Warn when a pointer is cast to an integer of a different size
 695
 696 Wpragmas
 697 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning
 698 Warn about misuses of pragmas
 699
 700 Wdate-time
 701 Common Var(cpp_warn_date_time) Warning
 702 Warn about __TIME__, __DATE__ and __TIMESTAMP__ usage
 703
 704 Wproperty-assign-default
 705 ObjC ObjC++ Var(warn_property_assign_default) Init(1) Warning
 706 Warn if a property for an Objective-C object has no assign semantics specified
 707
 708 Wprotocol
 709 ObjC ObjC++ Var(warn_protocol) Init(1) Warning
 710 Warn if inherited methods are unimplemented
 711
 712 Wredundant-decls
 713 C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning
 714 Warn about multiple declarations of the same object
 715
 716 Wreorder
 717 C++ ObjC++ Var(warn_reorder) Warning LangEnabledBy(C++ ObjC++,Wall)
 718 Warn when the compiler reorders code
 719
 720 Wreturn-type
 721 C ObjC C++ ObjC++ Var(warn_return_type) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 722 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
 723
 724 Wselector
 725 ObjC ObjC++ Var(warn_selector) Warning
 726 Warn if a selector has multiple methods
 727
 728 Wshadow-ivar
 729 ObjC ObjC++ Var(warn_shadow_ivar) EnabledBy(Wshadow) Init(1) Warning
 730 Warn if a local declaration hides an instance variable
 731
 732 Wsequence-point
 733 C ObjC C++ ObjC++ Var(warn_sequence_point) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 734 Warn about possible violations of sequence point rules
 735
 736 Wsign-compare
 737 C ObjC C++ ObjC++ Var(warn_sign_compare) Warning LangEnabledBy(C++ ObjC++,Wall)
 738 Warn about signed-unsigned comparisons
 739
 740 Wsign-compare
 741 C ObjC C++ ObjC++ EnabledBy(Wextra)
 742 ;
 743
 744 Wsign-conversion
 745 C ObjC C++ ObjC++ Var(warn_sign_conversion) LangEnabledBy(C ObjC,Wconversion)
 746 Warn for implicit type conversions between signed and unsigned integers
 747
 748 Wsign-promo
 749 C++ ObjC++ Var(warn_sign_promo) Warning
 750 Warn when overload promotes from unsigned to signed
 751
 752 Wstrict-null-sentinel
 753 C++ ObjC++ Warning Var(warn_strict_null_sentinel)
 754 Warn about uncasted NULL used as sentinel
 755
 756 Wstrict-prototypes
 757 C ObjC Var(warn_strict_prototypes) Warning
 758 Warn about unprototyped function declarations
 759
 760 Wstrict-aliasing=
 761 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 3, 0)
 762 ;
 763
 764 Wstrict-overflow=
 765 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
 766 ;
 767
 768 Wstrict-selector-match
 769 ObjC ObjC++ Var(warn_strict_selector_match) Warning
 770 Warn if type signatures of candidate methods do not match exactly
 771
 772 Wsync-nand
 773 C C++ Var(warn_sync_nand) Init(1) Warning
 774 Warn when __sync_fetch_and_nand and __sync_nand_and_fetch built-in functions are used
 775
 776 Wsynth
 777 C++ ObjC++ Var(warn_synth) Warning
 778 Deprecated.  This switch has no effect
 779
 780 Wsystem-headers
 781 C ObjC C++ ObjC++ Warning
 782 ; Documented in common.opt
 783
 784 Wtraditional
 785 C ObjC Var(warn_traditional) Warning
 786 Warn about features not present in traditional C
 787
 788 Wtraditional-conversion
 789 C ObjC Var(warn_traditional_conversion) Warning
 790 Warn of prototypes causing type conversions different from what would happen in the absence of prototype
 791
 792 Wtrigraphs
 793 C ObjC C++ ObjC++ Warning
 794 Warn if trigraphs are encountered that might affect the meaning of the program
 795
 796 Wundeclared-selector
 797 ObjC ObjC++ Var(warn_undeclared_selector) Warning
 798 Warn about @selector()s without previously declared methods
 799
 800 Wundef
 801 C ObjC C++ ObjC++ Warning
 802 Warn if an undefined macro is used in an #if directive
 803
 804 Wuninitialized
 805 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
 806 ;
 807
 808 Wmaybe-uninitialized
 809 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
 810 ;
 811
 812 Wunknown-pragmas
 813 C ObjC C++ ObjC++ Warning Var(warn_unknown_pragmas) LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
 814 Warn about unrecognized pragmas
 815
 816 Wunsuffixed-float-constants
 817 C ObjC Var(warn_unsuffixed_float_constants) Warning
 818 Warn about unsuffixed float constants
 819
 820 Wunused
 821 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
 822 ; documented in common.opt
 823
 824 Wunused-local-typedefs
 825 C ObjC C++ ObjC++ Var(warn_unused_local_typedefs) Warning EnabledBy(Wunused)
 826 Warn when typedefs locally defined in a function are not used
 827
 828 Wunused-macros
 829 C ObjC C++ ObjC++ Var(cpp_warn_unused_macros) Warning
 830 Warn about macros defined in the main file that are not used
 831
 832 Wunused-result
 833 C ObjC C++ ObjC++ Var(warn_unused_result) Init(1) Warning
 834 Warn if a caller of a function, marked with attribute warn_unused_result, does not use its return value
 835
 836 Wvariadic-macros
 837 C ObjC C++ ObjC++ Var(cpp_warn_variadic_macros) Init(1) Warning
 838 Warn about using variadic macros
 839
 840 Wvarargs
 841 C ObjC C++ ObjC++ Warning Var(warn_varargs) Init(1)
 842 Warn about questionable usage of the macros used to retrieve variable arguments
 843
 844 Wvla
 845 C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning
 846 Warn if a variable length array is used
 847
 848 Wvolatile-register-var
 849 C ObjC C++ ObjC++ Var(warn_volatile_register_var) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 850 Warn when a register variable is declared volatile
 851
 852 Wvirtual-move-assign
 853 C++ ObjC++ Var(warn_virtual_move_assign) Warning Init(1)
 854 Warn if a virtual base has a non-trivial move assignment operator
 855
 856 Wwrite-strings
 857 C ObjC C++ ObjC++ Var(warn_write_strings) Warning
 858 In 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.
 859
 860 Wzero-as-null-pointer-constant
 861 C++ ObjC++ Var(warn_zero_as_null_pointer_constant) Warning
 862 Warn when a literal '0' is used as null pointer
 863
 864 Wuseless-cast
 865 C++ ObjC++ Var(warn_useless_cast) Warning
 866 Warn about useless casts
 867
 868 ansi
 869 C ObjC C++ ObjC++
 870 A synonym for -std=c89 (for C) or -std=c++98 (for C++)
 871
 872 d
 873 C ObjC C++ ObjC++ Joined
 874 ; Documented in common.opt.  FIXME - what about -dI, -dD, -dN and -dD?
 875
 876 fabi-compat-version=
 877 C++ ObjC++ Joined RejectNegative UInteger Var(flag_abi_compat_version) Init(-1)
 878 The version of the C++ ABI used for -Wabi warnings and link compatibility aliases
 879
 880 faccess-control
 881 C++ ObjC++ Var(flag_access_control) Init(1)
 882 Enforce class member access control semantics
 883
 884 fada-spec-parent=
 885 C ObjC C++ ObjC++ RejectNegative Joined Var(ada_specs_parent)
 886 -fada-spec-parent=unit  Dump Ada specs as child units of given parent
 887
 888 fall-virtual
 889 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
 890
 891 fallow-parameterless-variadic-functions
 892 C ObjC Var(flag_allow_parameterless_variadic_functions)
 893 Allow variadic functions without named parameter
 894
 895 falt-external-templates
 896 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
 897 No longer supported
 898
 899 fasm
 900 C ObjC C++ ObjC++ Var(flag_no_asm, 0)
 901 Recognize the \"asm\" keyword
 902
 903 ; Define extra predefined macros for use in libgcc.
 904 fbuilding-libgcc
 905 C ObjC C++ ObjC++ Undocumented Var(flag_building_libgcc)
 906
 907 fbuiltin
 908 C ObjC C++ ObjC++ Var(flag_no_builtin, 0)
 909 Recognize built-in functions
 910
 911 fbuiltin-
 912 C ObjC C++ ObjC++ Joined
 913
 914 fcanonical-system-headers
 915 C ObjC C++ ObjC++
 916 Where shorter, use canonicalized paths to systems headers.
 917
 918 fcilkplus
 919 C ObjC C++ ObjC++ LTO Report Var(flag_cilkplus) Init(0)
 920 Enable Cilk Plus
 921
 922 fcond-mismatch
 923 C ObjC C++ ObjC++
 924 Allow the arguments of the '?' operator to have different types
 925
 926 fconserve-space
 927 C++ ObjC++ Var(flag_conserve_space)
 928 Does nothing.  Preserved for backward compatibility.
 929
 930 fconstant-string-class=
 931 ObjC ObjC++ Joined MissingArgError(no class name specified with %qs)
 932 -fconst-string-class=<name>     Use class <name> for constant strings
 933
 934 fconstexpr-depth=
 935 C++ ObjC++ Joined RejectNegative UInteger Var(max_constexpr_depth) Init(512)
 936 -fconstexpr-depth=<number>      Specify maximum constexpr recursion depth
 937
 938 fdebug-cpp
 939 C ObjC C++ ObjC++
 940 Emit debug annotations during preprocessing
 941
 942 fdeduce-init-list
 943 C++ ObjC++ Var(flag_deduce_init_list) Init(0)
 944 -fdeduce-init-list      enable deduction of std::initializer_list for a template type parameter from a brace-enclosed initializer-list
 945
 946 fdeclone-ctor-dtor
 947 C++ ObjC++ Var(flag_declone_ctor_dtor) Init(-1)
 948 Factor complex constructors and destructors to favor space over speed
 949
 950 fdefault-inline
 951 C++ ObjC++ Ignore
 952 Does nothing.  Preserved for backward compatibility.
 953
 954 fdirectives-only
 955 C ObjC C++ ObjC++
 956 Preprocess directives only.
 957
 958 fdollars-in-identifiers
 959 C ObjC C++ ObjC++
 960 Permit '$' as an identifier character
 961
 962 fdump-ada-spec
 963 C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec)
 964 Write all declarations as Ada code transitively
 965
 966 fdump-ada-spec-slim
 967 C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec_slim)
 968 Write all declarations as Ada code for the given file only
 969
 970 felide-constructors
 971 C++ ObjC++ Var(flag_elide_constructors) Init(1)
 972
 973 fenforce-eh-specs
 974 C++ ObjC++ Var(flag_enforce_eh_specs) Init(1)
 975 Generate code to check exception specifications
 976
 977 fenum-int-equiv
 978 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
 979
 980 fexec-charset=
 981 C ObjC C++ ObjC++ Joined RejectNegative
 982 -fexec-charset=<cset>   Convert all strings and character constants to character set <cset>
 983
 984 fextended-identifiers
 985 C ObjC C++ ObjC++
 986 Permit universal character names (\\u and \\U) in identifiers
 987
 988 finput-charset=
 989 C ObjC C++ ObjC++ Joined RejectNegative
 990 -finput-charset=<cset>  Specify the default character set for source files
 991
 992 fextern-tls-init
 993 C++ ObjC++ Var(flag_extern_tls_init) Init(-1)
 994 Support dynamic initialization of thread-local variables in a different translation unit
 995
 996 fexternal-templates
 997 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
 998
 999 ffor-scope
1000 C++ ObjC++ Var(flag_new_for_scope) Init(1)
1001 Scope of for-init-statement variables is local to the loop
1002
1003 ffreestanding
1004 C ObjC C++ ObjC++
1005 Do not assume that standard C libraries and \"main\" exist
1006
1007 fgnu-keywords
1008 C++ ObjC++ Var(flag_no_gnu_keywords, 0)
1009 Recognize GNU-defined keywords
1010
1011 fgnu-runtime
1012 ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime,0) Init(NEXT_OBJC_RUNTIME)
1013 Generate code for GNU runtime environment
1014
1015 fgnu89-inline
1016 C ObjC Var(flag_gnu89_inline) Init(-1)
1017 Use traditional GNU semantics for inline functions
1018
1019 fguiding-decls
1020 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1021
1022 fhandle-exceptions
1023 C++ ObjC++ Optimization Alias(fexceptions) Warn({-fhandle-exceptions has been renamed -fexceptions (and is now on by default)})
1024
1025 fhonor-std
1026 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1027
1028 fhosted
1029 C ObjC
1030 Assume normal C execution environment
1031
1032 fhuge-objects
1033 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1034 No longer supported
1035
1036 fimplement-inlines
1037 C++ ObjC++ Var(flag_implement_inlines) Init(1)
1038 Export functions even if they can be inlined
1039
1040 fimplicit-inline-templates
1041 C++ ObjC++ Var(flag_implicit_inline_templates) Init(1)
1042 Emit implicit instantiations of inline templates
1043
1044 fimplicit-templates
1045 C++ ObjC++ Var(flag_implicit_templates) Init(1)
1046 Emit implicit instantiations of templates
1047
1048 ffriend-injection
1049 C++ ObjC++ Var(flag_friend_injection)
1050 Inject friend functions into enclosing namespace
1051
1052 fkeep-inline-dllexport
1053 C C++ ObjC ObjC++ Var(flag_keep_inline_dllexport) Init(1) Report Condition(TARGET_DLLIMPORT_DECL_ATTRIBUTES)
1054 Don't emit dllexported inline functions unless needed
1055
1056 flabels-ok
1057 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1058
1059 flax-vector-conversions
1060 C ObjC C++ ObjC++ Var(flag_lax_vector_conversions)
1061 Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types.
1062
1063 fms-extensions
1064 C ObjC C++ ObjC++ Var(flag_ms_extensions)
1065 Don't warn about uses of Microsoft extensions
1066
1067 fmudflap
1068 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1069
1070 fmudflapth
1071 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1072
1073 fmudflapir
1074 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1075
1076 fname-mangling-version-
1077 C++ ObjC++ Joined Ignore Warn(switch %qs is no longer supported)
1078
1079 fnew-abi
1080 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1081
1082 fnext-runtime
1083 ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime)
1084 Generate code for NeXT (Apple Mac OS X) runtime environment
1085
1086 fnil-receivers
1087 ObjC ObjC++ Var(flag_nil_receivers) Init(1)
1088 Assume that receivers of Objective-C messages may be nil
1089
1090 flocal-ivars
1091 ObjC ObjC++ Var(flag_local_ivars) Init(1)
1092 Allow access to instance variables as if they were local declarations within instance method implementations.
1093
1094 fivar-visibility=
1095 ObjC ObjC++ Joined RejectNegative Enum(ivar_visibility) Var(default_ivar_visibility) Init(IVAR_VISIBILITY_PROTECTED)
1096 -fvisibility=[private|protected|public|package] Set the default symbol visibility
1097
1098 Enum
1099 Name(ivar_visibility) Type(enum ivar_visibility) UnknownError(unrecognized ivar visibility value %qs)
1100
1101 EnumValue
1102 Enum(ivar_visibility) String(private) Value(IVAR_VISIBILITY_PRIVATE)
1103
1104 EnumValue
1105 Enum(ivar_visibility) String(protected) Value(IVAR_VISIBILITY_PROTECTED)
1106
1107 EnumValue
1108 Enum(ivar_visibility) String(public) Value(IVAR_VISIBILITY_PUBLIC)
1109
1110 EnumValue
1111 Enum(ivar_visibility) String(package) Value(IVAR_VISIBILITY_PACKAGE)
1112
1113 fnonansi-builtins
1114 C++ ObjC++ Var(flag_no_nonansi_builtin, 0)
1115
1116 fnonnull-objects
1117 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1118
1119 fnothrow-opt
1120 C++ ObjC++ Optimization Var(flag_nothrow_opt)
1121 Treat a throw() exception specification as noexcept to improve code size
1122
1123 fobjc-abi-version=
1124 ObjC ObjC++ LTO Joined Report RejectNegative UInteger Var(flag_objc_abi)
1125 Specify which ABI to use for Objective-C family code and meta-data generation.
1126
1127 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
1128 ; to initialize any non-POD ivars in Objective-C++ classes.
1129 fobjc-call-cxx-cdtors
1130 ObjC++ Var(flag_objc_call_cxx_cdtors)
1131 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
1132
1133 fobjc-direct-dispatch
1134 ObjC ObjC++ Var(flag_objc_direct_dispatch)
1135 Allow fast jumps to the message dispatcher
1136
1137 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
1138 ; @try, etc.) in source code.
1139 fobjc-exceptions
1140 ObjC ObjC++ Var(flag_objc_exceptions)
1141 Enable Objective-C exception and synchronization syntax
1142
1143 fobjc-gc
1144 ObjC ObjC++ LTO Var(flag_objc_gc)
1145 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
1146
1147 fobjc-nilcheck
1148 ObjC ObjC++ Var(flag_objc_nilcheck,1)
1149 Enable inline checks for nil receivers with the NeXT runtime and ABI version 2.
1150
1151 ; Nonzero means that we generate NeXT setjmp based exceptions.
1152 fobjc-sjlj-exceptions
1153 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
1154 Enable Objective-C setjmp exception handling runtime
1155
1156 fobjc-std=objc1
1157 ObjC ObjC++ Var(flag_objc1_only)
1158 Conform to the Objective-C 1.0 language as implemented in GCC 4.0
1159
1160 fopenmp
1161 C ObjC C++ ObjC++ Var(flag_openmp)
1162 Enable OpenMP (implies -frecursive in Fortran)
1163
1164 fopenmp-simd
1165 C ObjC C++ ObjC++ Var(flag_openmp_simd)
1166 Enable OpenMP's SIMD directives
1167
1168 foperator-names
1169 C++ ObjC++
1170 Recognize C++ keywords like \"compl\" and \"xor\"
1171
1172 foptional-diags
1173 C++ ObjC++ Ignore
1174 Does nothing.  Preserved for backward compatibility.
1175
1176 fpch-deps
1177 C ObjC C++ ObjC++
1178
1179 fpch-preprocess
1180 C ObjC C++ ObjC++
1181 Look for and use PCH files even when preprocessing
1182
1183 fpermissive
1184 C++ ObjC++ Var(flag_permissive)
1185 Downgrade conformance errors to warnings
1186
1187 fplan9-extensions
1188 C ObjC Var(flag_plan9_extensions)
1189 Enable Plan 9 language extensions
1190
1191 fpreprocessed
1192 C ObjC C++ ObjC++
1193 Treat the input file as already preprocessed
1194
1195 ftrack-macro-expansion
1196 C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger
1197 ; converted into ftrack-macro-expansion=
1198
1199 ftrack-macro-expansion=
1200 C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger
1201 -ftrack-macro-expansion=<0|1|2>  Track locations of tokens coming from macro expansion and display them in error messages
1202
1203 fpretty-templates
1204 C++ ObjC++ Var(flag_pretty_templates) Init(1)
1205 -fno-pretty-templates Do not pretty-print template specializations as the template signature followed by the arguments
1206
1207 freplace-objc-classes
1208 ObjC ObjC++ LTO Var(flag_replace_objc_classes)
1209 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
1210
1211 frepo
1212 C++ ObjC++
1213 Enable automatic template instantiation
1214
1215 frtti
1216 C++ ObjC++ Optimization Var(flag_rtti) Init(1)
1217 Generate run time type descriptor information
1218
1219 fshort-double
1220 C ObjC C++ ObjC++ LTO Optimization Var(flag_short_double)
1221 Use the same size for double as for float
1222
1223 fshort-enums
1224 C ObjC C++ ObjC++ LTO Optimization Var(flag_short_enums)
1225 Use the narrowest integer type possible for enumeration types
1226
1227 fshort-wchar
1228 C ObjC C++ ObjC++ LTO Optimization Var(flag_short_wchar)
1229 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
1230
1231 fsigned-bitfields
1232 C ObjC C++ ObjC++ Var(flag_signed_bitfields) Init(1)
1233 When \"signed\" or \"unsigned\" is not given make the bitfield signed
1234
1235 fsigned-char
1236 C ObjC C++ ObjC++ LTO Var(flag_signed_char)
1237 Make \"char\" signed by default
1238
1239 fsquangle
1240 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1241
1242 fstats
1243 C++ ObjC++ Var(flag_detailed_statistics)
1244 Display statistics accumulated during compilation
1245
1246 fstrict-enums
1247 C++ ObjC++ Optimization Var(flag_strict_enums)
1248 Assume that values of enumeration type are always within the minimum range of that type
1249
1250 fstrict-prototype
1251 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1252
1253 ftabstop=
1254 C ObjC C++ ObjC++ Joined RejectNegative UInteger
1255 -ftabstop=<number>      Distance between tab stops for column reporting
1256
1257 ftemplate-backtrace-limit=
1258 C++ ObjC++ Joined RejectNegative UInteger Var(template_backtrace_limit) Init(10)
1259 Set the maximum number of template instantiation notes for a single warning or error
1260
1261 ftemplate-depth-
1262 C++ ObjC++ Joined RejectNegative Undocumented Alias(ftemplate-depth=)
1263
1264 ftemplate-depth=
1265 C++ ObjC++ Joined RejectNegative UInteger
1266 -ftemplate-depth=<number>       Specify maximum template instantiation depth
1267
1268 fthis-is-variable
1269 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1270
1271 fthreadsafe-statics
1272 C++ ObjC++ Optimization Var(flag_threadsafe_statics) Init(1)
1273 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
1274
1275 funsigned-bitfields
1276 C ObjC C++ ObjC++ Var(flag_signed_bitfields, 0)
1277 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
1278
1279 funsigned-char
1280 C ObjC C++ ObjC++ LTO Var(flag_signed_char, 0)
1281 Make \"char\" unsigned by default
1282
1283 fuse-cxa-atexit
1284 C++ ObjC++ Var(flag_use_cxa_atexit) Init(DEFAULT_USE_CXA_ATEXIT)
1285 Use __cxa_atexit to register destructors
1286
1287 fuse-cxa-get-exception-ptr
1288 C++ ObjC++ Var(flag_use_cxa_get_exception_ptr) Init(2)
1289 Use __cxa_get_exception_ptr in exception handling
1290
1291 fvisibility-inlines-hidden
1292 C++ ObjC++
1293 Marks all inlined functions and methods as having hidden visibility
1294
1295 fvisibility-ms-compat
1296 C++ ObjC++ Var(flag_visibility_ms_compat)
1297 Changes visibility to match Microsoft Visual Studio by default
1298
1299 fvtable-gc
1300 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1301 No longer supported
1302
1303 fvtable-thunks
1304 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1305 No longer supported
1306
1307 fweak
1308 C++ ObjC++ Var(flag_weak) Init(1)
1309 Emit common-like symbols as weak symbols
1310
1311 fwide-exec-charset=
1312 C ObjC C++ ObjC++ Joined RejectNegative
1313 -fwide-exec-charset=<cset>      Convert all wide strings and character constants to character set <cset>
1314
1315 fworking-directory
1316 C ObjC C++ ObjC++ Var(flag_working_directory) Init(-1)
1317 Generate a #line directive pointing at the current working directory
1318
1319 fxref
1320 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1321 No longer supported
1322
1323 fzero-link
1324 ObjC ObjC++ Var(flag_zero_link)
1325 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
1326
1327 gen-decls
1328 ObjC ObjC++ Var(flag_gen_declaration)
1329 Dump declarations to a .decl file
1330
1331 femit-struct-debug-baseonly
1332 C ObjC C++ ObjC++
1333 -femit-struct-debug-baseonly    Aggressive reduced debug info for structs
1334
1335 femit-struct-debug-reduced
1336 C ObjC C++ ObjC++
1337 -femit-struct-debug-reduced     Conservative reduced debug info for structs
1338
1339 femit-struct-debug-detailed=
1340 C ObjC C++ ObjC++ Joined
1341 -femit-struct-debug-detailed=<spec-list>        Detailed reduced debug info for structs
1342
1343 fext-numeric-literals
1344 C++ ObjC++
1345 Interpret imaginary, fixed-point, or other gnu number suffix as the corresponding
1346 number literal rather than a user-defined number literal.
1347
1348 idirafter
1349 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1350 -idirafter <dir>        Add <dir> to the end of the system include path
1351
1352 imacros
1353 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
1354 -imacros <file> Accept definition of macros in <file>
1355
1356 imultilib
1357 C ObjC C++ ObjC++ Joined Separate
1358 -imultilib <dir>        Set <dir> to be the multilib include subdirectory
1359
1360 include
1361 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
1362 -include <file> Include the contents of <file> before other files
1363
1364 iprefix
1365 C ObjC C++ ObjC++ Joined Separate
1366 -iprefix <path> Specify <path> as a prefix for next two options
1367
1368 isysroot
1369 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1370 -isysroot <dir> Set <dir> to be the system root directory
1371
1372 isystem
1373 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1374 -isystem <dir>  Add <dir> to the start of the system include path
1375
1376 iquote
1377 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1378 -iquote <dir>   Add <dir> to the end of the quote include path
1379
1380 iwithprefix
1381 C ObjC C++ ObjC++ Joined Separate
1382 -iwithprefix <dir>      Add <dir> to the end of the system include path
1383
1384 iwithprefixbefore
1385 C ObjC C++ ObjC++ Joined Separate
1386 -iwithprefixbefore <dir>        Add <dir> to the end of the main include path
1387
1388 lang-asm
1389 C Undocumented RejectDriver
1390
1391 no-integrated-cpp
1392 Driver
1393
1394 nostdinc
1395 C ObjC C++ ObjC++
1396 Do not search standard system include directories (those specified with -isystem will still be used)
1397
1398 nostdinc++
1399 C++ ObjC++
1400 Do not search standard system include directories for C++
1401
1402 o
1403 C ObjC C++ ObjC++ Joined Separate
1404 ; Documented in common.opt
1405
1406 pedantic
1407 C ObjC C++ ObjC++ Alias(Wpedantic)
1408 ; Documented in common.opt
1409
1410 print-objc-runtime-info
1411 ObjC ObjC++
1412 Generate C header of platform-specific features
1413
1414 remap
1415 C ObjC C++ ObjC++
1416 Remap file names when including files
1417
1418 std=c++98
1419 C++ ObjC++
1420 Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum
1421
1422 std=c++03
1423 C++ ObjC++ Alias(std=c++98)
1424 Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum
1425
1426 std=c++11
1427 C++ ObjC++
1428 Conform to the ISO 2011 C++ standard
1429
1430 std=c++0x
1431 C++ ObjC++ Alias(std=c++11) Undocumented
1432 Deprecated in favor of -std=c++11
1433
1434 std=c++1y
1435 C++ ObjC++
1436 Conform to the ISO 2014(?) C++ draft standard (experimental and incomplete support)
1437
1438 std=c++14
1439 C++ ObjC++ Alias(std=c++1y) Undocumented
1440
1441 std=c++1z
1442 C++ ObjC++
1443 Conform to the ISO 2017(?) C++ draft standard (experimental and incomplete support)
1444
1445 std=c++17
1446 C++ ObjC++ Alias(std=c++1z) Undocumented
1447
1448 std=c11
1449 C ObjC
1450 Conform to the ISO 2011 C standard (experimental and incomplete support)
1451
1452 std=c1x
1453 C ObjC Alias(std=c11)
1454 Deprecated in favor of -std=c11
1455
1456 std=c89
1457 C ObjC Alias(std=c90)
1458 Conform to the ISO 1990 C standard
1459
1460 std=c90
1461 C ObjC
1462 Conform to the ISO 1990 C standard
1463
1464 std=c99
1465 C ObjC
1466 Conform to the ISO 1999 C standard
1467
1468 std=c9x
1469 C ObjC Alias(std=c99)
1470 Deprecated in favor of -std=c99
1471
1472 std=gnu++98
1473 C++ ObjC++
1474 Conform to the ISO 1998 C++ standard revised by the 2003 technical
1475 corrigendum with GNU extensions
1476
1477 std=gnu++03
1478 C++ ObjC++ Alias(std=gnu++98)
1479 Conform to the ISO 1998 C++ standard revised by the 2003 technical
1480 corrigendum with GNU extensions
1481
1482 std=gnu++11
1483 C++ ObjC++
1484 Conform to the ISO 2011 C++ standard with GNU extensions (experimental and incomplete support)
1485
1486 std=gnu++0x
1487 C++ ObjC++ Alias(std=gnu++11)
1488 Deprecated in favor of -std=gnu++11
1489
1490 std=gnu++1y
1491 C++ ObjC++
1492 Conform to the ISO 201y(4?) C++ draft standard with GNU extensions (experimental and incomplete support)
1493
1494 std=gnu++14
1495 C++ ObjC++ Alias(std=gnu++1y) Undocumented
1496
1497 std=gnu++1z
1498 C++ ObjC++
1499 Conform to the ISO 201z(7?) C++ draft standard with GNU extensions (experimental and incomplete support)
1500
1501 std=gnu++17
1502 C++ ObjC++ Alias(std=gnu++1y) Undocumented
1503
1504 std=gnu11
1505 C ObjC
1506 Conform to the ISO 2011 C standard with GNU extensions (experimental and incomplete support)
1507
1508 std=gnu1x
1509 C ObjC Alias(std=gnu11)
1510 Deprecated in favor of -std=gnu11
1511
1512 std=gnu89
1513 C ObjC Alias(std=gnu90)
1514 Conform to the ISO 1990 C standard with GNU extensions
1515
1516 std=gnu90
1517 C ObjC
1518 Conform to the ISO 1990 C standard with GNU extensions
1519
1520 std=gnu99
1521 C ObjC
1522 Conform to the ISO 1999 C standard with GNU extensions
1523
1524 std=gnu9x
1525 C ObjC Alias(std=gnu99)
1526 Deprecated in favor of -std=gnu99
1527
1528 std=iso9899:1990
1529 C ObjC Alias(std=c90)
1530 Conform to the ISO 1990 C standard
1531
1532 std=iso9899:199409
1533 C ObjC
1534 Conform to the ISO 1990 C standard as amended in 1994
1535
1536 std=iso9899:1999
1537 C ObjC Alias(std=c99)
1538 Conform to the ISO 1999 C standard
1539
1540 std=iso9899:199x
1541 C ObjC Alias(std=c99)
1542 Deprecated in favor of -std=iso9899:1999
1543
1544 std=iso9899:2011
1545 C ObjC Alias(std=c11)
1546 Conform to the ISO 2011 C standard (experimental and incomplete support)
1547
1548 traditional
1549 Driver
1550
1551 traditional-cpp
1552 C ObjC C++ ObjC++
1553 Enable traditional preprocessing
1554
1555 trigraphs
1556 C ObjC C++ ObjC++
1557 -trigraphs      Support ISO C trigraphs
1558
1559 undef
1560 C ObjC C++ ObjC++ Var(flag_undef)
1561 Do not predefine system-specific and GCC-specific macros
1562
1563 v
1564 C ObjC C++ ObjC++
1565 ; Documented in common.opt
1566
1567 w
1568 C ObjC C++ ObjC++
1569 ; Documented in common.opt
1570
1571 ; This comment is to ensure we retain the blank line above.