gcc/c-family/c.opt

   1 ; Options for the C, ObjC, C++ and ObjC++ front ends.
   2 ; Copyright (C) 2003-2015 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 LangEnabledBy(C ObjC C++ ObjC++,Wabi)
 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 Warray-bounds=
 283 LangEnabledBy(C ObjC C++ ObjC++,Wall,1,0)
 284 ; in common.opt
 285
 286 Wassign-intercept
 287 ObjC ObjC++ Var(warn_assign_intercept) Warning
 288 Warn whenever an Objective-C assignment is being intercepted by the garbage collector
 289
 290 Wbad-function-cast
 291 C ObjC Var(warn_bad_function_cast) Warning
 292 Warn about casting functions to incompatible types
 293
 294 Wbool-compare
 295 C ObjC C++ ObjC++ Var(warn_bool_compare) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 296 Warn about boolean expression compared with an integer value different from true/false
 297
 298 Wbuiltin-macro-redefined
 299 C ObjC C++ ObjC++ CPP(warn_builtin_macro_redefined) CppReason(CPP_W_BUILTIN_MACRO_REDEFINED) Var(cpp_warn_builtin_macro_redefined) Init(1) Warning
 300 Warn when a built-in preprocessor macro is undefined or redefined
 301
 302 Wc90-c99-compat
 303 C ObjC CPP(cpp_warn_c90_c99_compat) CppReason(CPP_W_C90_C99_COMPAT) Var(warn_c90_c99_compat) Init(-1) Warning
 304 Warn about features not present in ISO C90, but present in ISO C99
 305
 306 Wc99-c11-compat
 307 C ObjC Var(warn_c99_c11_compat) Init(-1) Warning
 308 Warn about features not present in ISO C99, but present in ISO C11
 309
 310 Wc++-compat
 311 C ObjC Var(warn_cxx_compat) CPP(warn_cxx_operator_names) CppReason(CPP_W_CXX_OPERATOR_NAMES) Init(0) Warning
 312 Warn about C constructs that are not in the common subset of C and C++
 313
 314 Wc++0x-compat
 315 C++ ObjC++ Warning Alias(Wc++11-compat) Undocumented
 316
 317 Wc++11-compat
 318 C++ ObjC++ Var(warn_cxx11_compat) Warning LangEnabledBy(C++ ObjC++,Wall) Init(0) CPP(cpp_warn_cxx11_compat) CppReason(CPP_W_CXX11_COMPAT)
 319 Warn about C++ constructs whose meaning differs between ISO C++ 1998 and ISO C++ 2011
 320
 321 Wc++14-compat
 322 C++ ObjC++ Var(warn_cxx14_compat) Warning LangEnabledBy(C++ ObjC++,Wall)
 323 Warn about C++ constructs whose meaning differs between ISO C++ 2011 and ISO C++ 2014
 324
 325 Wcast-qual
 326 C ObjC C++ ObjC++ Var(warn_cast_qual) Warning
 327 Warn about casts which discard qualifiers
 328
 329 Wchar-subscripts
 330 C ObjC C++ ObjC++ Var(warn_char_subscripts) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 331 Warn about subscripts whose type is \"char\"
 332
 333 Wchkp
 334 C ObjC C++ ObjC++ Var(warn_chkp) Warning EnabledBy(Wall)
 335 Warn about memory access errors found by Pointer Bounds Checker
 336
 337 Wclobbered
 338 C ObjC C++ ObjC++ Var(warn_clobbered) Warning EnabledBy(Wextra)
 339 Warn about variables that might be changed by \"longjmp\" or \"vfork\"
 340
 341 Wcomment
 342 C ObjC C++ ObjC++ CPP(warn_comments) CppReason(CPP_W_COMMENTS) Var(cpp_warn_comment) Init(0) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 343 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
 344
 345 Wcomments
 346 C ObjC C++ ObjC++ Warning Alias(Wcomment)
 347 Synonym for -Wcomment
 348
 349 Wconditionally-supported
 350 C++ ObjC++ Var(warn_conditionally_supported) Warning
 351 Warn for conditionally-supported constructs
 352
 353 Wconversion
 354 C ObjC C++ ObjC++ Var(warn_conversion) Warning
 355 Warn for implicit type conversions that may change a value
 356
 357 Wconversion-null
 358 C++ ObjC++ Var(warn_conversion_null) Init(1) Warning
 359 Warn for converting NULL from/to a non-pointer type
 360
 361 Wcpp
 362 C ObjC C++ ObjC++ CppReason(CPP_W_WARNING_DIRECTIVE)
 363 ; Documented in common.opt
 364
 365 Wctor-dtor-privacy
 366 C++ ObjC++ Var(warn_ctor_dtor_privacy) Warning
 367 Warn when all constructors and destructors are private
 368
 369 Wdate-time
 370 C ObjC C++ ObjC++ CPP(warn_date_time) CppReason(CPP_W_DATE_TIME) Var(cpp_warn_date_time) Init(0) Warning
 371 Warn about __TIME__, __DATE__ and __TIMESTAMP__ usage
 372
 373 Wdeclaration-after-statement
 374 C ObjC Var(warn_declaration_after_statement) Init(-1) Warning
 375 Warn when a declaration is found after a statement
 376
 377 Wdelete-incomplete
 378 C++ ObjC++ Var(warn_delete_incomplete) Init(1) Warning
 379 Warn when deleting a pointer to incomplete type
 380
 381 Wdelete-non-virtual-dtor
 382 C++ ObjC++ Var(warn_delnonvdtor) Warning LangEnabledBy(C++ ObjC++,Wall || Weffc++)
 383 Warn about deleting polymorphic objects with non-virtual destructors
 384
 385 Wdeprecated
 386 C C++ ObjC ObjC++ CPP(cpp_warn_deprecated) CppReason(CPP_W_DEPRECATED) Var(warn_deprecated) Init(1) Warning
 387 Warn if a deprecated compiler feature, class, method, or field is used
 388
 389 Wdesignated-init
 390 C ObjC Var(warn_designated_init) Init(1) Warning
 391 Warn about positional initialization of structs requiring designated initializers
 392
 393 Wdiscarded-array-qualifiers
 394 C ObjC Var(warn_discarded_array_qualifiers) Init(1) Warning
 395 Warn if qualifiers on arrays which are pointer targets are discarded
 396
 397 Wdiscarded-qualifiers
 398 C ObjC Var(warn_discarded_qualifiers) Init(1) Warning
 399 Warn if type qualifiers on pointers are discarded
 400
 401 Wdiv-by-zero
 402 C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1) Warning
 403 Warn about compile-time integer division by zero
 404
 405 Weffc++
 406 C++ ObjC++ Var(warn_ecpp) Warning
 407 Warn about violations of Effective C++ style rules
 408
 409 Wempty-body
 410 C ObjC C++ ObjC++ Var(warn_empty_body) Warning EnabledBy(Wextra)
 411 Warn about an empty body in an if or else statement
 412
 413 Wendif-labels
 414 C ObjC C++ ObjC++ CPP(warn_endif_labels) CppReason(CPP_W_ENDIF_LABELS) Var(cpp_warn_endif_labels) Init(1) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
 415 Warn about stray tokens after #elif and #endif
 416
 417 Wenum-compare
 418 C ObjC C++ ObjC++ Var(warn_enum_compare) Init(-1) Warning LangEnabledBy(C ObjC,Wall || Wc++-compat)
 419 Warn about comparison of different enum types
 420
 421 Werror
 422 C ObjC C++ ObjC++
 423 ; Documented in common.opt
 424
 425 Werror-implicit-function-declaration
 426 C ObjC RejectNegative Warning Alias(Werror=, implicit-function-declaration)
 427 This switch is deprecated; use -Werror=implicit-function-declaration instead
 428
 429 Wfloat-conversion
 430 C ObjC C++ ObjC++ Var(warn_float_conversion) LangEnabledBy(C ObjC C++ ObjC++,Wconversion)
 431 Warn for implicit type conversions that cause loss of floating point precision
 432
 433 Wfloat-equal
 434 C ObjC C++ ObjC++ Var(warn_float_equal) Warning
 435 Warn if testing floating point numbers for equality
 436
 437 Wformat
 438 C ObjC C++ ObjC++ Warning Alias(Wformat=, 1, 0)
 439 Warn about printf/scanf/strftime/strfmon format string anomalies
 440
 441 Wformat-contains-nul
 442 C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
 443 Warn about format strings that contain NUL bytes
 444
 445 Wformat-extra-args
 446 C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
 447 Warn if passing too many arguments to a function for its format string
 448
 449 Wformat-nonliteral
 450 C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
 451 Warn about format strings that are not literals
 452
 453 Wformat-security
 454 C ObjC C++ ObjC++ Var(warn_format_security) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
 455 Warn about possible security problems with format functions
 456
 457 Wformat-signedness
 458 C ObjC C++ ObjC++ Var(warn_format_signedness) Warning
 459 Warn about sign differences with format functions
 460
 461 Wformat-y2k
 462 C ObjC C++ ObjC++ Var(warn_format_y2k) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 2, 0)
 463 Warn about strftime formats yielding 2-digit years
 464
 465 Wformat-zero-length
 466 C ObjC C++ ObjC++ Var(warn_format_zero_length) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1, 0)
 467 Warn about zero-length formats
 468
 469 Wformat=
 470 C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_format) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
 471 Warn about printf/scanf/strftime/strfmon format string anomalies
 472
 473 Wignored-qualifiers
 474 C C++ Var(warn_ignored_qualifiers) Warning EnabledBy(Wextra)
 475 Warn whenever type qualifiers are ignored.
 476
 477 Wincompatible-pointer-types
 478 C ObjC Var(warn_incompatible_pointer_types) Init(1) Warning
 479 Warn when there is a conversion between pointers that have incompatible types
 480
 481 Winit-self
 482 C ObjC C++ ObjC++ Var(warn_init_self) Warning LangEnabledBy(C++ ObjC++,Wall)
 483 Warn about variables which are initialized to themselves
 484
 485 Wimplicit
 486 C ObjC Var(warn_implicit) Warning LangEnabledBy(C ObjC,Wall)
 487 Warn about implicit declarations
 488
 489 Wdouble-promotion
 490 C ObjC C++ ObjC++ Var(warn_double_promotion) Warning
 491 Warn about implicit conversions from \"float\" to \"double\"
 492
 493 Wimplicit-function-declaration
 494 C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning LangEnabledBy(C ObjC,Wimplicit)
 495 Warn about implicit function declarations
 496
 497 Wimplicit-int
 498 C ObjC Var(warn_implicit_int) Init(-1) Warning LangEnabledBy(C ObjC,Wimplicit)
 499 Warn when a declaration does not specify a type
 500
 501 Wimport
 502 C ObjC C++ ObjC++ Undocumented Ignore
 503
 504 Winherited-variadic-ctor
 505 C++ ObjC++ Var(warn_inh_var_ctor) Init(1) Warning
 506 Warn about C++11 inheriting constructors when the base has a variadic constructor
 507
 508 Wint-conversion
 509 C ObjC Var(warn_int_conversion) Init(1) Warning
 510 Warn about incompatible integer to pointer and pointer to integer conversions
 511
 512 Wint-to-pointer-cast
 513 C ObjC C++ ObjC++ Var(warn_int_to_pointer_cast) Init(1) Warning
 514 Warn when there is a cast to a pointer from an integer of a different size
 515
 516 Winvalid-offsetof
 517 C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning
 518 Warn about invalid uses of the \"offsetof\" macro
 519
 520 Winvalid-pch
 521 C ObjC C++ ObjC++ CPP(warn_invalid_pch) CppReason(CPP_W_INVALID_PCH) Var(cpp_warn_invalid_pch) Init(0) Warning
 522 Warn about PCH files that are found but not used
 523
 524 Wjump-misses-init
 525 C ObjC Var(warn_jump_misses_init) Warning LangEnabledby(C ObjC,Wc++-compat)
 526 Warn when a jump misses a variable initialization
 527
 528 Wliteral-suffix
 529 C++ ObjC++ CPP(warn_literal_suffix) CppReason(CPP_W_LITERAL_SUFFIX) Var(cpp_warn_literal_suffix) Init(1) Warning
 530 Warn when a string or character literal is followed by a ud-suffix which does not begin with an underscore.
 531
 532 Wlogical-op
 533 C ObjC C++ ObjC++ Var(warn_logical_op) Init(0) Warning
 534 Warn when a logical operator is suspiciously always evaluating to true or false
 535
 536 Wlogical-not-parentheses
 537 C ObjC C++ ObjC++ Var(warn_logical_not_paren) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 538 Warn when logical not is used on the left hand side operand of a comparison
 539
 540 Wlong-long
 541 C ObjC C++ ObjC++ CPP(cpp_warn_long_long) CppReason(CPP_W_LONG_LONG) Var(warn_long_long) Init(-1) Warning LangEnabledBy(C ObjC,Wc90-c99-compat)
 542 Do not warn about using \"long long\" when -pedantic
 543
 544 Wmain
 545 C ObjC C++ ObjC++ Var(warn_main) Init(-1) Warning LangEnabledBy(C ObjC,Wall, 2, 0)
 546 Warn about suspicious declarations of \"main\"
 547
 548 Wmain
 549 LangEnabledBy(C ObjC C++ ObjC++,Wpedantic, 2, 0)
 550 ;
 551
 552 Wmemset-transposed-args
 553 C ObjC C++ ObjC++ Var(warn_memset_transposed_args) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 554 Warn about suspicious calls to memset where the third argument is constant literal zero and the second is not
 555
 556 Wmissing-braces
 557 C ObjC C++ ObjC++ Var(warn_missing_braces) Warning LangEnabledBy(C ObjC,Wall)
 558 Warn about possibly missing braces around initializers
 559
 560 Wmissing-declarations
 561 C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning
 562 Warn about global functions without previous declarations
 563
 564 Wmissing-field-initializers
 565 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Warning EnabledBy(Wextra)
 566 Warn about missing fields in struct initializers
 567
 568 Wsized-deallocation
 569 C++ ObjC++ Var(warn_sized_deallocation) Warning EnabledBy(Wextra)
 570 Warn about missing sized deallocation functions
 571
 572 Wsizeof-pointer-memaccess
 573 C ObjC C++ ObjC++ Var(warn_sizeof_pointer_memaccess) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 574 Warn about suspicious length parameters to certain string functions if the argument uses sizeof
 575
 576 Wsizeof-array-argument
 577 C ObjC C++ ObjC++ Var(warn_sizeof_array_argument) Warning Init(1)
 578 Warn when sizeof is applied on a parameter declared as an array
 579
 580 Wsuggest-attribute=format
 581 C ObjC C++ ObjC++ Var(warn_suggest_attribute_format) Warning
 582 Warn about functions which might be candidates for format attributes
 583
 584 Wsuggest-override
 585 C++ ObjC++ Var(warn_override) Warning
 586 Suggest that the override keyword be used when the declaration of a virtual
 587 function overrides another.
 588
 589 Wswitch
 590 C ObjC C++ ObjC++ Var(warn_switch) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 591 Warn about enumerated switches, with no default, missing a case
 592
 593 Wswitch-default
 594 C ObjC C++ ObjC++ Var(warn_switch_default) Warning
 595 Warn about enumerated switches missing a \"default:\" statement
 596
 597 Wswitch-enum
 598 C ObjC C++ ObjC++ Var(warn_switch_enum) Warning
 599 Warn about all enumerated switches missing a specific case
 600
 601 Wswitch-bool
 602 C ObjC C++ ObjC++ Var(warn_switch_bool) Warning Init(1)
 603 Warn about switches with boolean controlling expression
 604
 605 Wmissing-format-attribute
 606 C ObjC C++ ObjC++ Alias(Wsuggest-attribute=format)
 607 ;
 608
 609 Wmissing-include-dirs
 610 C ObjC C++ ObjC++ CPP(warn_missing_include_dirs) CppReason(CPP_W_MISSING_INCLUDE_DIRS) Var(cpp_warn_missing_include_dirs) Init(0) Warning
 611 Warn about user-specified include directories that do not exist
 612
 613 Wmissing-parameter-type
 614 C ObjC Var(warn_missing_parameter_type) Warning EnabledBy(Wextra)
 615 Warn about function parameters declared without a type specifier in K&R-style functions
 616
 617 Wmissing-prototypes
 618 C ObjC Var(warn_missing_prototypes) Warning
 619 Warn about global functions without prototypes
 620
 621 Wmudflap
 622 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
 623
 624 Wmultichar
 625 C ObjC C++ ObjC++ CPP(warn_multichar) CppReason(CPP_W_MULTICHAR) Var(cpp_warn_multichar) Init(0) Warning
 626 Warn about use of multi-character character constants
 627
 628 Wnarrowing
 629 C ObjC C++ ObjC++ Warning Var(warn_narrowing) Init(-1) LangEnabledBy(C++ ObjC++,Wall || Wc++11-compat)
 630 Warn about narrowing conversions within { } that are ill-formed in C++11
 631
 632 Wnested-externs
 633 C ObjC Var(warn_nested_externs) Warning
 634 Warn about \"extern\" declarations not at file scope
 635
 636 Wnoexcept
 637 C++ ObjC++ Var(warn_noexcept) Warning
 638 Warn when a noexcept expression evaluates to false even though the expression can't actually throw
 639
 640 Wnon-template-friend
 641 C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning
 642 Warn when non-templatized friend functions are declared within a template
 643
 644 Wnon-virtual-dtor
 645 C++ ObjC++ Var(warn_nonvdtor) Warning LangEnabledBy(C++ ObjC++,Weffc++)
 646 Warn about non-virtual destructors
 647
 648 Wnonnull
 649 C ObjC C++ ObjC++ Var(warn_nonnull) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1,0)
 650 Warn about NULL being passed to argument slots marked as requiring non-NULL
 651
 652 Wnonnull
 653 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
 654 ;
 655
 656 Wnormalized
 657 C ObjC C++ ObjC++ Alias(Wnormalized=,nfc,none)
 658 ;
 659
 660 Wnormalized=
 661 C ObjC C++ ObjC++ RejectNegative Joined Warning CPP(warn_normalize) CppReason(CPP_W_NORMALIZE) Init(normalized_C) Var(cpp_warn_normalize) Enum(cpp_normalize_level)
 662 -Wnormalized=<none|id|nfc|nfkc> Warn about non-normalised Unicode strings
 663
 664 ; Required for these enum values.
 665 SourceInclude
 666 cpplib.h
 667
 668 Enum
 669 Name(cpp_normalize_level) Type(int) UnknownError(argument %qs to %<-Wnormalized%> not recognized)
 670
 671 EnumValue
 672 Enum(cpp_normalize_level) String(none) Value(normalized_none)
 673
 674 EnumValue
 675 Enum(cpp_normalize_level) String(nfkc) Value(normalized_KC)
 676
 677 EnumValue
 678 Enum(cpp_normalize_level) String(id) Value(normalized_identifier_C)
 679
 680 EnumValue
 681 Enum(cpp_normalize_level) String(nfc) Value(normalized_C)
 682
 683 Wold-style-cast
 684 C++ ObjC++ Var(warn_old_style_cast) Warning
 685 Warn if a C-style cast is used in a program
 686
 687 Wold-style-declaration
 688 C ObjC Var(warn_old_style_declaration) Warning EnabledBy(Wextra)
 689 Warn for obsolescent usage in a declaration
 690
 691 Wold-style-definition
 692 C ObjC Var(warn_old_style_definition) Warning
 693 Warn if an old-style parameter definition is used
 694
 695 Wopenmp-simd
 696 C C++ Var(warn_openmp_simd) Warning LangEnabledBy(C C++,Wall)
 697 Warn if a simd directive is overridden by the vectorizer cost model
 698
 699 Woverlength-strings
 700 C ObjC C++ ObjC++ Var(warn_overlength_strings) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
 701 Warn if a string is longer than the maximum portable length specified by the standard
 702
 703 Woverloaded-virtual
 704 C++ ObjC++ Var(warn_overloaded_virtual) Warning
 705 Warn about overloaded virtual function names
 706
 707 Woverride-init
 708 C ObjC Var(warn_override_init) Warning EnabledBy(Wextra)
 709 Warn about overriding initializers without side effects
 710
 711 Woverride-init-side-effects
 712 C ObjC Var(warn_override_init_side_effects) Init(1) Warning
 713 Warn about overriding initializers with side effects
 714
 715 Wpacked-bitfield-compat
 716 C ObjC C++ ObjC++ Var(warn_packed_bitfield_compat) Init(-1) Warning
 717 Warn about packed bit-fields whose offset changed in GCC 4.4
 718
 719 Wparentheses
 720 C ObjC C++ ObjC++ Var(warn_parentheses) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 721 Warn about possibly missing parentheses
 722
 723 Wpedantic
 724 C ObjC C++ ObjC++ CPP(cpp_pedantic) CppReason(CPP_W_PEDANTIC) Warning
 725 ; Documented in common.opt
 726
 727 Wpmf-conversions
 728 C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning
 729 Warn when converting the type of pointers to member functions
 730
 731 Wpointer-arith
 732 C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
 733 Warn about function pointer arithmetic
 734
 735 Wpointer-sign
 736 C ObjC Var(warn_pointer_sign) Warning LangEnabledBy(C ObjC,Wall || Wpedantic)
 737 Warn when a pointer differs in signedness in an assignment
 738
 739 Wpointer-to-int-cast
 740 C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning
 741 Warn when a pointer is cast to an integer of a different size
 742
 743 Wpragmas
 744 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning
 745 Warn about misuses of pragmas
 746
 747 Wproperty-assign-default
 748 ObjC ObjC++ Var(warn_property_assign_default) Init(1) Warning
 749 Warn if a property for an Objective-C object has no assign semantics specified
 750
 751 Wprotocol
 752 ObjC ObjC++ Var(warn_protocol) Init(1) Warning
 753 Warn if inherited methods are unimplemented
 754
 755 Wredundant-decls
 756 C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning
 757 Warn about multiple declarations of the same object
 758
 759 Wreorder
 760 C++ ObjC++ Var(warn_reorder) Warning LangEnabledBy(C++ ObjC++,Wall)
 761 Warn when the compiler reorders code
 762
 763 Wreturn-type
 764 C ObjC C++ ObjC++ Var(warn_return_type) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 765 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
 766
 767 Wselector
 768 ObjC ObjC++ Var(warn_selector) Warning
 769 Warn if a selector has multiple methods
 770
 771 Wsequence-point
 772 C ObjC C++ ObjC++ Var(warn_sequence_point) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 773 Warn about possible violations of sequence point rules
 774
 775 Wshadow-ivar
 776 ObjC ObjC++ Var(warn_shadow_ivar) EnabledBy(Wshadow) Init(1) Warning
 777 Warn if a local declaration hides an instance variable
 778
 779 Wshift-count-negative
 780 C ObjC C++ ObjC++ Var(warn_shift_count_negative) Init(1) Warning
 781 Warn if shift count is negative
 782
 783 Wshift-count-overflow
 784 C ObjC C++ ObjC++ Var(warn_shift_count_overflow) Init(1) Warning
 785 Warn if shift count >= width of type
 786
 787 Wshift-negative-value
 788 C ObjC C++ ObjC++ Var(warn_shift_negative_value) Init(-1) Warning
 789 Warn if left shifting a negative value
 790
 791 Wsign-compare
 792 C ObjC C++ ObjC++ Var(warn_sign_compare) Warning LangEnabledBy(C++ ObjC++,Wall)
 793 Warn about signed-unsigned comparisons
 794
 795 Wsign-compare
 796 C ObjC C++ ObjC++ EnabledBy(Wextra)
 797 ;
 798
 799 Wsign-conversion
 800 C ObjC C++ ObjC++ Var(warn_sign_conversion) LangEnabledBy(C ObjC,Wconversion)
 801 Warn for implicit type conversions between signed and unsigned integers
 802
 803 Wsign-promo
 804 C++ ObjC++ Var(warn_sign_promo) Warning
 805 Warn when overload promotes from unsigned to signed
 806
 807 Wstrict-null-sentinel
 808 C++ ObjC++ Warning Var(warn_strict_null_sentinel)
 809 Warn about uncasted NULL used as sentinel
 810
 811 Wstrict-prototypes
 812 C ObjC Var(warn_strict_prototypes) Warning
 813 Warn about unprototyped function declarations
 814
 815 Wstrict-aliasing=
 816 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 3, 0)
 817 ;
 818
 819 Wstrict-overflow=
 820 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
 821 ;
 822
 823 Wstrict-selector-match
 824 ObjC ObjC++ Var(warn_strict_selector_match) Warning
 825 Warn if type signatures of candidate methods do not match exactly
 826
 827 Wsync-nand
 828 C C++ Var(warn_sync_nand) Init(1) Warning
 829 Warn when __sync_fetch_and_nand and __sync_nand_and_fetch built-in functions are used
 830
 831 Wsynth
 832 C++ ObjC++ Var(warn_synth) Warning
 833 Deprecated.  This switch has no effect
 834
 835 Wsystem-headers
 836 C ObjC C++ ObjC++ Warning
 837 ; Documented in common.opt
 838
 839 Wterminate
 840 C++ ObjC++ Warning Var(warn_terminate) Init(1)
 841 Warn if a throw expression will always result in a call to terminate()
 842
 843 Wtraditional
 844 C ObjC CPP(cpp_warn_traditional) CppReason(CPP_W_TRADITIONAL) Var(warn_traditional) Init(0) Warning
 845 Warn about features not present in traditional C
 846
 847 Wtraditional-conversion
 848 C ObjC Var(warn_traditional_conversion) Warning
 849 Warn of prototypes causing type conversions different from what would happen in the absence of prototype
 850
 851 Wtrigraphs
 852 C ObjC C++ ObjC++ CPP(warn_trigraphs) CppReason(CPP_W_TRIGRAPHS) Var(cpp_warn_trigraphs) Init(2) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 853 Warn if trigraphs are encountered that might affect the meaning of the program
 854
 855 Wundeclared-selector
 856 ObjC ObjC++ Var(warn_undeclared_selector) Warning
 857 Warn about @selector()s without previously declared methods
 858
 859 Wundef
 860 C ObjC C++ ObjC++ CPP(warn_undef) CppReason(CPP_W_UNDEF) Var(cpp_warn_undef) Init(0) Warning
 861 Warn if an undefined macro is used in an #if directive
 862
 863 Wuninitialized
 864 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
 865 ;
 866
 867 Wmaybe-uninitialized
 868 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
 869 ;
 870
 871 Wunknown-pragmas
 872 C ObjC C++ ObjC++ Warning Var(warn_unknown_pragmas) LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
 873 Warn about unrecognized pragmas
 874
 875 Wunsuffixed-float-constants
 876 C ObjC Var(warn_unsuffixed_float_constants) Warning
 877 Warn about unsuffixed float constants
 878
 879 Wunused
 880 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
 881 ; documented in common.opt
 882
 883 Wunused-local-typedefs
 884 C ObjC C++ ObjC++ Var(warn_unused_local_typedefs) Warning EnabledBy(Wunused)
 885 Warn when typedefs locally defined in a function are not used
 886
 887 Wunused-macros
 888 C ObjC C++ ObjC++ CppReason(CPP_W_UNUSED_MACROS) Var(cpp_warn_unused_macros) Warning
 889 Warn about macros defined in the main file that are not used
 890
 891 Wunused-result
 892 C ObjC C++ ObjC++ Var(warn_unused_result) Init(1) Warning
 893 Warn if a caller of a function, marked with attribute warn_unused_result, does not use its return value
 894
 895 Wvariadic-macros
 896 C ObjC C++ ObjC++ CPP(warn_variadic_macros) CppReason(CPP_W_VARIADIC_MACROS) Var(cpp_warn_variadic_macros) Init(0) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic || Wtraditional)
 897 Warn about using variadic macros
 898
 899 Wvarargs
 900 C ObjC C++ ObjC++ Warning Var(warn_varargs) Init(1)
 901 Warn about questionable usage of the macros used to retrieve variable arguments
 902
 903 Wvla
 904 C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning
 905 Warn if a variable length array is used
 906
 907 Wvolatile-register-var
 908 C ObjC C++ ObjC++ Var(warn_volatile_register_var) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 909 Warn when a register variable is declared volatile
 910
 911 Wvirtual-move-assign
 912 C++ ObjC++ Var(warn_virtual_move_assign) Warning Init(1)
 913 Warn if a virtual base has a non-trivial move assignment operator
 914
 915 Wwrite-strings
 916 C ObjC C++ ObjC++ Var(warn_write_strings) Warning
 917 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.
 918
 919 Wzero-as-null-pointer-constant
 920 C++ ObjC++ Var(warn_zero_as_null_pointer_constant) Warning
 921 Warn when a literal '0' is used as null pointer
 922
 923 Wuseless-cast
 924 C++ ObjC++ Var(warn_useless_cast) Warning
 925 Warn about useless casts
 926
 927 ansi
 928 C ObjC C++ ObjC++
 929 A synonym for -std=c89 (for C) or -std=c++98 (for C++)
 930
 931 d
 932 C ObjC C++ ObjC++ Joined
 933 ; Documented in common.opt.  FIXME - what about -dI, -dD, -dN and -dD?
 934
 935 fabi-compat-version=
 936 C++ ObjC++ Joined RejectNegative UInteger Var(flag_abi_compat_version) Init(-1)
 937 The version of the C++ ABI used for -Wabi warnings and link compatibility aliases
 938
 939 faccess-control
 940 C++ ObjC++ Var(flag_access_control) Init(1)
 941 Enforce class member access control semantics
 942
 943 fada-spec-parent=
 944 C ObjC C++ ObjC++ RejectNegative Joined Var(ada_specs_parent)
 945 -fada-spec-parent=unit  Dump Ada specs as child units of given parent
 946
 947 fall-virtual
 948 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
 949
 950 fallow-parameterless-variadic-functions
 951 C ObjC Var(flag_allow_parameterless_variadic_functions)
 952 Allow variadic functions without named parameter
 953
 954 falt-external-templates
 955 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
 956 No longer supported
 957
 958 fasm
 959 C ObjC C++ ObjC++ Var(flag_no_asm, 0)
 960 Recognize the \"asm\" keyword
 961
 962 ; Define extra predefined macros for use in libgcc.
 963 fbuilding-libgcc
 964 C ObjC C++ ObjC++ Undocumented Var(flag_building_libgcc)
 965
 966 fbuiltin
 967 C ObjC C++ ObjC++ Var(flag_no_builtin, 0)
 968 Recognize built-in functions
 969
 970 fbuiltin-
 971 C ObjC C++ ObjC++ Joined
 972
 973 fcanonical-system-headers
 974 C ObjC C++ ObjC++
 975 Where shorter, use canonicalized paths to systems headers.
 976
 977 fcheck-pointer-bounds
 978 C ObjC C++ ObjC++ LTO Report Var(flag_check_pointer_bounds)
 979 Add Pointer Bounds Checker instrumentation.  fchkp-* flags are used to
 980 control instrumentation.  Currently available for C, C++ and ObjC.
 981
 982 fchkp-check-incomplete-type
 983 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_incomplete_type) Init(1)
 984 Generate pointer bounds checks for variables with incomplete type
 985
 986 fchkp-zero-input-bounds-for-main
 987 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_zero_input_bounds_for_main) Init(0)
 988 Use zero bounds for all incoming arguments in 'main' function.  It helps when
 989 instrumented binaries are used with legacy libs.
 990
 991 fchkp-first-field-has-own-bounds
 992 C ObjC C++ ObjC++ LTO RejectNegative Report Var(flag_chkp_first_field_has_own_bounds)
 993 Forces Pointer Bounds Checker to use narrowed bounds for address of the first
 994 field in the structure.  By default pointer to the first field has the same
 995 bounds as pointer to the whole structure.
 996
 997 fchkp-narrow-bounds
 998 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_narrow_bounds) Init(1)
 999 Control how Pointer Bounds Checker handle pointers to object fields.  When
1000 narrowing is on, field bounds are used.  Otherwise full object bounds are used.
1001
1002 fchkp-narrow-to-innermost-array
1003 C ObjC C++ ObjC++ LTO RejectNegative Report Var(flag_chkp_narrow_to_innermost_arrray)
1004 Forces Pointer Bounds Checker to use bounds of the innermost arrays in case of
1005 nested static arryas access.  By default outermost array is used.
1006
1007 fchkp-optimize
1008 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_optimize) Init(-1)
1009 Allow Pointer Bounds Checker optimizations.  By default allowed
1010 on optimization levels >0.
1011
1012 fchkp-use-fast-string-functions
1013 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_fast_string_functions) Init(0)
1014 Allow to use *_nobnd versions of string functions by Pointer Bounds Checker.
1015
1016 fchkp-use-nochk-string-functions
1017 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_nochk_string_functions) Init(0)
1018 Allow to use *_nochk versions of string functions by Pointer Bounds Checker.
1019
1020 fchkp-use-static-bounds
1021 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_static_bounds) Init(1)
1022 Use statically initialized variable for vars bounds instead of
1023 generating them each time it is required.
1024
1025 fchkp-use-static-const-bounds
1026 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_static_const_bounds) Init(-1)
1027 Use statically initialized variable for constant bounds instead of
1028 generating them each time it is required.
1029
1030 fchkp-treat-zero-dynamic-size-as-infinite
1031 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_zero_dynamic_size_as_infinite) Init(0)
1032 With this option zero size obtained dynamically for objects with
1033 incomplete type will be treated as infinite.
1034
1035 fchkp-check-read
1036 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_check_read) Init(1)
1037 Generate checks for all read accesses to memory.
1038
1039 fchkp-check-write
1040 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_check_write) Init(1)
1041 Generate checks for all write accesses to memory.
1042
1043 fchkp-store-bounds
1044 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_store_bounds) Init(1)
1045 Generate bounds stores for pointer writes.
1046
1047 fchkp-instrument-calls
1048 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_instrument_calls) Init(1)
1049 Generate bounds passing for calls.
1050
1051 fchkp-instrument-marked-only
1052 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_instrument_marked_only) Init(0)
1053 Instrument only functions marked with bnd_instrument attribute.
1054
1055 fchkp-use-wrappers
1056 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_wrappers) Init(1)
1057 Transform instrumented builtin calls into calls to wrappers.
1058
1059 static-libmpx
1060 Driver
1061
1062 static-libmpxwrappers
1063 Driver
1064
1065 fcilkplus
1066 C ObjC C++ ObjC++ LTO Report Var(flag_cilkplus) Init(0)
1067 Enable Cilk Plus
1068
1069 fcond-mismatch
1070 C ObjC C++ ObjC++
1071 Allow the arguments of the '?' operator to have different types
1072
1073 fconserve-space
1074 C++ ObjC++ Var(flag_conserve_space)
1075 Does nothing.  Preserved for backward compatibility.
1076
1077 fconstant-string-class=
1078 ObjC ObjC++ Joined MissingArgError(no class name specified with %qs)
1079 -fconst-string-class=<name>     Use class <name> for constant strings
1080
1081 fconstexpr-depth=
1082 C++ ObjC++ Joined RejectNegative UInteger Var(max_constexpr_depth) Init(512)
1083 -fconstexpr-depth=<number>      Specify maximum constexpr recursion depth
1084
1085 fdebug-cpp
1086 C ObjC C++ ObjC++
1087 Emit debug annotations during preprocessing
1088
1089 fdeduce-init-list
1090 C++ ObjC++ Var(flag_deduce_init_list) Init(0)
1091 -fdeduce-init-list      enable deduction of std::initializer_list for a template type parameter from a brace-enclosed initializer-list
1092
1093 fdeclone-ctor-dtor
1094 C++ ObjC++ Var(flag_declone_ctor_dtor) Init(-1)
1095 Factor complex constructors and destructors to favor space over speed
1096
1097 fdefault-inline
1098 C++ ObjC++ Ignore
1099 Does nothing.  Preserved for backward compatibility.
1100
1101 fdirectives-only
1102 C ObjC C++ ObjC++
1103 Preprocess directives only.
1104
1105 fdollars-in-identifiers
1106 C ObjC C++ ObjC++
1107 Permit '$' as an identifier character
1108
1109 fdump-ada-spec
1110 C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec)
1111 Write all declarations as Ada code transitively
1112
1113 fdump-ada-spec-slim
1114 C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec_slim)
1115 Write all declarations as Ada code for the given file only
1116
1117 felide-constructors
1118 C++ ObjC++ Var(flag_elide_constructors) Init(1)
1119
1120 fenforce-eh-specs
1121 C++ ObjC++ Var(flag_enforce_eh_specs) Init(1)
1122 Generate code to check exception specifications
1123
1124 fenum-int-equiv
1125 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1126
1127 fexec-charset=
1128 C ObjC C++ ObjC++ Joined RejectNegative
1129 -fexec-charset=<cset>   Convert all strings and character constants to character set <cset>
1130
1131 fextended-identifiers
1132 C ObjC C++ ObjC++
1133 Permit universal character names (\\u and \\U) in identifiers
1134
1135 finput-charset=
1136 C ObjC C++ ObjC++ Joined RejectNegative
1137 -finput-charset=<cset>  Specify the default character set for source files
1138
1139 fextern-tls-init
1140 C++ ObjC++ Var(flag_extern_tls_init) Init(-1)
1141 Support dynamic initialization of thread-local variables in a different translation unit
1142
1143 fexternal-templates
1144 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1145
1146 ffor-scope
1147 C++ ObjC++ Var(flag_new_for_scope) Init(1)
1148 Scope of for-init-statement variables is local to the loop
1149
1150 ffreestanding
1151 C ObjC C++ ObjC++
1152 Do not assume that standard C libraries and \"main\" exist
1153
1154 fgnu-keywords
1155 C++ ObjC++ Var(flag_no_gnu_keywords, 0)
1156 Recognize GNU-defined keywords
1157
1158 fgnu-runtime
1159 ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime,0) Init(NEXT_OBJC_RUNTIME)
1160 Generate code for GNU runtime environment
1161
1162 fgnu89-inline
1163 C ObjC Var(flag_gnu89_inline) Init(-1)
1164 Use traditional GNU semantics for inline functions
1165
1166 fguiding-decls
1167 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1168
1169 fhandle-exceptions
1170 C++ ObjC++ Optimization Alias(fexceptions) Warn({-fhandle-exceptions has been renamed -fexceptions (and is now on by default)})
1171
1172 fhonor-std
1173 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1174
1175 fhosted
1176 C ObjC
1177 Assume normal C execution environment
1178
1179 fhuge-objects
1180 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1181 No longer supported
1182
1183 fimplement-inlines
1184 C++ ObjC++ Var(flag_implement_inlines) Init(1)
1185 Export functions even if they can be inlined
1186
1187 fimplicit-inline-templates
1188 C++ ObjC++ Var(flag_implicit_inline_templates) Init(1)
1189 Emit implicit instantiations of inline templates
1190
1191 fimplicit-templates
1192 C++ ObjC++ Var(flag_implicit_templates) Init(1)
1193 Emit implicit instantiations of templates
1194
1195 ffriend-injection
1196 C++ ObjC++ Var(flag_friend_injection)
1197 Inject friend functions into enclosing namespace
1198
1199 fkeep-inline-dllexport
1200 C C++ ObjC ObjC++ Var(flag_keep_inline_dllexport) Init(1) Report Condition(TARGET_DLLIMPORT_DECL_ATTRIBUTES)
1201 Don't emit dllexported inline functions unless needed
1202
1203 flabels-ok
1204 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1205
1206 flax-vector-conversions
1207 C ObjC C++ ObjC++ Var(flag_lax_vector_conversions)
1208 Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types.
1209
1210 fms-extensions
1211 C ObjC C++ ObjC++ Var(flag_ms_extensions)
1212 Don't warn about uses of Microsoft extensions
1213
1214 fmudflap
1215 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1216
1217 fmudflapth
1218 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1219
1220 fmudflapir
1221 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1222
1223 fname-mangling-version-
1224 C++ ObjC++ Joined Ignore Warn(switch %qs is no longer supported)
1225
1226 fnew-abi
1227 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1228
1229 fnext-runtime
1230 ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime)
1231 Generate code for NeXT (Apple Mac OS X) runtime environment
1232
1233 fnil-receivers
1234 ObjC ObjC++ Var(flag_nil_receivers) Init(1)
1235 Assume that receivers of Objective-C messages may be nil
1236
1237 flocal-ivars
1238 ObjC ObjC++ Var(flag_local_ivars) Init(1)
1239 Allow access to instance variables as if they were local declarations within instance method implementations.
1240
1241 fivar-visibility=
1242 ObjC ObjC++ Joined RejectNegative Enum(ivar_visibility) Var(default_ivar_visibility) Init(IVAR_VISIBILITY_PROTECTED)
1243 -fvisibility=[private|protected|public|package] Set the default symbol visibility
1244
1245 Enum
1246 Name(ivar_visibility) Type(enum ivar_visibility) UnknownError(unrecognized ivar visibility value %qs)
1247
1248 EnumValue
1249 Enum(ivar_visibility) String(private) Value(IVAR_VISIBILITY_PRIVATE)
1250
1251 EnumValue
1252 Enum(ivar_visibility) String(protected) Value(IVAR_VISIBILITY_PROTECTED)
1253
1254 EnumValue
1255 Enum(ivar_visibility) String(public) Value(IVAR_VISIBILITY_PUBLIC)
1256
1257 EnumValue
1258 Enum(ivar_visibility) String(package) Value(IVAR_VISIBILITY_PACKAGE)
1259
1260 fnonansi-builtins
1261 C++ ObjC++ Var(flag_no_nonansi_builtin, 0)
1262
1263 fnonnull-objects
1264 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1265
1266 fnothrow-opt
1267 C++ ObjC++ Optimization Var(flag_nothrow_opt)
1268 Treat a throw() exception specification as noexcept to improve code size
1269
1270 fobjc-abi-version=
1271 ObjC ObjC++ LTO Joined Report RejectNegative UInteger Var(flag_objc_abi)
1272 Specify which ABI to use for Objective-C family code and meta-data generation.
1273
1274 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
1275 ; to initialize any non-POD ivars in Objective-C++ classes.
1276 fobjc-call-cxx-cdtors
1277 ObjC++ Var(flag_objc_call_cxx_cdtors)
1278 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
1279
1280 fobjc-direct-dispatch
1281 ObjC ObjC++ Var(flag_objc_direct_dispatch)
1282 Allow fast jumps to the message dispatcher
1283
1284 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
1285 ; @try, etc.) in source code.
1286 fobjc-exceptions
1287 ObjC ObjC++ Var(flag_objc_exceptions)
1288 Enable Objective-C exception and synchronization syntax
1289
1290 fobjc-gc
1291 ObjC ObjC++ LTO Var(flag_objc_gc)
1292 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
1293
1294 fobjc-nilcheck
1295 ObjC ObjC++ Var(flag_objc_nilcheck,1)
1296 Enable inline checks for nil receivers with the NeXT runtime and ABI version 2.
1297
1298 ; Nonzero means that we generate NeXT setjmp based exceptions.
1299 fobjc-sjlj-exceptions
1300 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
1301 Enable Objective-C setjmp exception handling runtime
1302
1303 fobjc-std=objc1
1304 ObjC ObjC++ Var(flag_objc1_only)
1305 Conform to the Objective-C 1.0 language as implemented in GCC 4.0
1306
1307 fopenacc
1308 C ObjC C++ ObjC++ LTO Var(flag_openacc)
1309 Enable OpenACC
1310
1311 fopenmp
1312 C ObjC C++ ObjC++ LTO Var(flag_openmp)
1313 Enable OpenMP (implies -frecursive in Fortran)
1314
1315 fopenmp-simd
1316 C ObjC C++ ObjC++ Var(flag_openmp_simd)
1317 Enable OpenMP's SIMD directives
1318
1319 foperator-names
1320 C++ ObjC++
1321 Recognize C++ keywords like \"compl\" and \"xor\"
1322
1323 foptional-diags
1324 C++ ObjC++ Ignore
1325 Does nothing.  Preserved for backward compatibility.
1326
1327 fpch-deps
1328 C ObjC C++ ObjC++
1329
1330 fpch-preprocess
1331 C ObjC C++ ObjC++
1332 Look for and use PCH files even when preprocessing
1333
1334 fpermissive
1335 C++ ObjC++ Var(flag_permissive)
1336 Downgrade conformance errors to warnings
1337
1338 fplan9-extensions
1339 C ObjC Var(flag_plan9_extensions)
1340 Enable Plan 9 language extensions
1341
1342 fpreprocessed
1343 C ObjC C++ ObjC++
1344 Treat the input file as already preprocessed
1345
1346 ftrack-macro-expansion
1347 C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger
1348 ; converted into ftrack-macro-expansion=
1349
1350 ftrack-macro-expansion=
1351 C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger
1352 -ftrack-macro-expansion=<0|1|2>  Track locations of tokens coming from macro expansion and display them in error messages
1353
1354 fpretty-templates
1355 C++ ObjC++ Var(flag_pretty_templates) Init(1)
1356 -fno-pretty-templates Do not pretty-print template specializations as the template signature followed by the arguments
1357
1358 freplace-objc-classes
1359 ObjC ObjC++ LTO Var(flag_replace_objc_classes)
1360 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
1361
1362 frepo
1363 C++ ObjC++
1364 Enable automatic template instantiation
1365
1366 frtti
1367 C++ ObjC++ Optimization Var(flag_rtti) Init(1)
1368 Generate run time type descriptor information
1369
1370 fshort-double
1371 C ObjC C++ ObjC++ LTO Optimization Var(flag_short_double)
1372 Use the same size for double as for float
1373
1374 fshort-enums
1375 C ObjC C++ ObjC++ LTO Optimization Var(flag_short_enums)
1376 Use the narrowest integer type possible for enumeration types
1377
1378 fshort-wchar
1379 C ObjC C++ ObjC++ LTO Optimization Var(flag_short_wchar)
1380 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
1381
1382 fsigned-bitfields
1383 C ObjC C++ ObjC++ Var(flag_signed_bitfields) Init(1)
1384 When \"signed\" or \"unsigned\" is not given make the bitfield signed
1385
1386 fsigned-char
1387 C ObjC C++ ObjC++ LTO Var(flag_signed_char)
1388 Make \"char\" signed by default
1389
1390 fsized-deallocation
1391 C++ ObjC++ Var(flag_sized_deallocation) Init(-1)
1392 Enable C++14 sized deallocation support
1393
1394 fsquangle
1395 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1396
1397 fstats
1398 C++ ObjC++ Var(flag_detailed_statistics)
1399 Display statistics accumulated during compilation
1400
1401 fstrict-enums
1402 C++ ObjC++ Optimization Var(flag_strict_enums)
1403 Assume that values of enumeration type are always within the minimum range of that type
1404
1405 fstrict-prototype
1406 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1407
1408 ftabstop=
1409 C ObjC C++ ObjC++ Joined RejectNegative UInteger
1410 -ftabstop=<number>      Distance between tab stops for column reporting
1411
1412 ftemplate-backtrace-limit=
1413 C++ ObjC++ Joined RejectNegative UInteger Var(template_backtrace_limit) Init(10)
1414 Set the maximum number of template instantiation notes for a single warning or error
1415
1416 ftemplate-depth-
1417 C++ ObjC++ Joined RejectNegative Undocumented Alias(ftemplate-depth=)
1418
1419 ftemplate-depth=
1420 C++ ObjC++ Joined RejectNegative UInteger
1421 -ftemplate-depth=<number>       Specify maximum template instantiation depth
1422
1423 fthis-is-variable
1424 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1425
1426 fthreadsafe-statics
1427 C++ ObjC++ Optimization Var(flag_threadsafe_statics) Init(1)
1428 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
1429
1430 funsigned-bitfields
1431 C ObjC C++ ObjC++ Var(flag_signed_bitfields, 0)
1432 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
1433
1434 funsigned-char
1435 C ObjC C++ ObjC++ LTO Var(flag_signed_char, 0)
1436 Make \"char\" unsigned by default
1437
1438 fuse-cxa-atexit
1439 C++ ObjC++ Var(flag_use_cxa_atexit) Init(DEFAULT_USE_CXA_ATEXIT)
1440 Use __cxa_atexit to register destructors
1441
1442 fuse-cxa-get-exception-ptr
1443 C++ ObjC++ Var(flag_use_cxa_get_exception_ptr) Init(2)
1444 Use __cxa_get_exception_ptr in exception handling
1445
1446 fvisibility-inlines-hidden
1447 C++ ObjC++
1448 Marks all inlined functions and methods as having hidden visibility
1449
1450 fvisibility-ms-compat
1451 C++ ObjC++ Var(flag_visibility_ms_compat)
1452 Changes visibility to match Microsoft Visual Studio by default
1453
1454 fvtable-gc
1455 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1456 No longer supported
1457
1458 fvtable-thunks
1459 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1460 No longer supported
1461
1462 fweak
1463 C++ ObjC++ Var(flag_weak) Init(1)
1464 Emit common-like symbols as weak symbols
1465
1466 fwide-exec-charset=
1467 C ObjC C++ ObjC++ Joined RejectNegative
1468 -fwide-exec-charset=<cset>      Convert all wide strings and character constants to character set <cset>
1469
1470 fworking-directory
1471 C ObjC C++ ObjC++ Var(flag_working_directory) Init(-1)
1472 Generate a #line directive pointing at the current working directory
1473
1474 fxref
1475 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1476 No longer supported
1477
1478 fzero-link
1479 ObjC ObjC++ Var(flag_zero_link)
1480 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
1481
1482 gen-decls
1483 ObjC ObjC++ Var(flag_gen_declaration)
1484 Dump declarations to a .decl file
1485
1486 femit-struct-debug-baseonly
1487 C ObjC C++ ObjC++
1488 -femit-struct-debug-baseonly    Aggressive reduced debug info for structs
1489
1490 femit-struct-debug-reduced
1491 C ObjC C++ ObjC++
1492 -femit-struct-debug-reduced     Conservative reduced debug info for structs
1493
1494 femit-struct-debug-detailed=
1495 C ObjC C++ ObjC++ Joined
1496 -femit-struct-debug-detailed=<spec-list>        Detailed reduced debug info for structs
1497
1498 fext-numeric-literals
1499 C++ ObjC++
1500 Interpret imaginary, fixed-point, or other gnu number suffix as the corresponding
1501 number literal rather than a user-defined number literal.
1502
1503 idirafter
1504 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1505 -idirafter <dir>        Add <dir> to the end of the system include path
1506
1507 imacros
1508 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
1509 -imacros <file> Accept definition of macros in <file>
1510
1511 imultilib
1512 C ObjC C++ ObjC++ Joined Separate
1513 -imultilib <dir>        Set <dir> to be the multilib include subdirectory
1514
1515 include
1516 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
1517 -include <file> Include the contents of <file> before other files
1518
1519 iprefix
1520 C ObjC C++ ObjC++ Joined Separate
1521 -iprefix <path> Specify <path> as a prefix for next two options
1522
1523 isysroot
1524 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1525 -isysroot <dir> Set <dir> to be the system root directory
1526
1527 isystem
1528 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1529 -isystem <dir>  Add <dir> to the start of the system include path
1530
1531 iquote
1532 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1533 -iquote <dir>   Add <dir> to the end of the quote include path
1534
1535 iwithprefix
1536 C ObjC C++ ObjC++ Joined Separate
1537 -iwithprefix <dir>      Add <dir> to the end of the system include path
1538
1539 iwithprefixbefore
1540 C ObjC C++ ObjC++ Joined Separate
1541 -iwithprefixbefore <dir>        Add <dir> to the end of the main include path
1542
1543 lang-asm
1544 C Undocumented RejectDriver
1545
1546 no-integrated-cpp
1547 Driver
1548
1549 nostdinc
1550 C ObjC C++ ObjC++
1551 Do not search standard system include directories (those specified with -isystem will still be used)
1552
1553 nostdinc++
1554 C++ ObjC++
1555 Do not search standard system include directories for C++
1556
1557 o
1558 C ObjC C++ ObjC++ Joined Separate
1559 ; Documented in common.opt
1560
1561 pedantic
1562 C ObjC C++ ObjC++ Alias(Wpedantic)
1563 ; Documented in common.opt
1564
1565 print-objc-runtime-info
1566 ObjC ObjC++
1567 Generate C header of platform-specific features
1568
1569 remap
1570 C ObjC C++ ObjC++
1571 Remap file names when including files
1572
1573 std=c++98
1574 C++ ObjC++
1575 Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum
1576
1577 std=c++03
1578 C++ ObjC++ Alias(std=c++98)
1579 Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum
1580
1581 std=c++11
1582 C++ ObjC++
1583 Conform to the ISO 2011 C++ standard
1584
1585 std=c++0x
1586 C++ ObjC++ Alias(std=c++11) Undocumented
1587 Deprecated in favor of -std=c++11
1588
1589 std=c++1y
1590 C++ ObjC++ Alias(std=c++14) Undocumented
1591 Deprecated in favor of -std=c++14
1592
1593 std=c++14
1594 C++ ObjC++
1595 Conform to the ISO 2014 C++ standard
1596
1597 std=c++1z
1598 C++ ObjC++
1599 Conform to the ISO 2017(?) C++ draft standard (experimental and incomplete support)
1600
1601 std=c++17
1602 C++ ObjC++ Alias(std=c++1z) Undocumented
1603
1604 std=c11
1605 C ObjC
1606 Conform to the ISO 2011 C standard (experimental and incomplete support)
1607
1608 std=c1x
1609 C ObjC Alias(std=c11)
1610 Deprecated in favor of -std=c11
1611
1612 std=c89
1613 C ObjC Alias(std=c90)
1614 Conform to the ISO 1990 C standard
1615
1616 std=c90
1617 C ObjC
1618 Conform to the ISO 1990 C standard
1619
1620 std=c99
1621 C ObjC
1622 Conform to the ISO 1999 C standard
1623
1624 std=c9x
1625 C ObjC Alias(std=c99)
1626 Deprecated in favor of -std=c99
1627
1628 std=gnu++98
1629 C++ ObjC++
1630 Conform to the ISO 1998 C++ standard revised by the 2003 technical
1631 corrigendum with GNU extensions
1632
1633 std=gnu++03
1634 C++ ObjC++ Alias(std=gnu++98)
1635 Conform to the ISO 1998 C++ standard revised by the 2003 technical
1636 corrigendum with GNU extensions
1637
1638 std=gnu++11
1639 C++ ObjC++
1640 Conform to the ISO 2011 C++ standard with GNU extensions (experimental and incomplete support)
1641
1642 std=gnu++0x
1643 C++ ObjC++ Alias(std=gnu++11) Undocumented
1644 Deprecated in favor of -std=gnu++11
1645
1646 std=gnu++1y
1647 C++ ObjC++ Alias(std=gnu++14) Undocumented
1648 Deprecated in favor of -std=gnu++14
1649
1650 std=gnu++14
1651 C++ ObjC++
1652 Conform to the ISO 2014 C++ standard with GNU extensions (experimental and incomplete support)
1653
1654 std=gnu++1z
1655 C++ ObjC++
1656 Conform to the ISO 201z(7?) C++ draft standard with GNU extensions (experimental and incomplete support)
1657
1658 std=gnu++17
1659 C++ ObjC++ Alias(std=gnu++1z) Undocumented
1660
1661 std=gnu11
1662 C ObjC
1663 Conform to the ISO 2011 C standard with GNU extensions (experimental and incomplete support)
1664
1665 std=gnu1x
1666 C ObjC Alias(std=gnu11)
1667 Deprecated in favor of -std=gnu11
1668
1669 std=gnu89
1670 C ObjC Alias(std=gnu90)
1671 Conform to the ISO 1990 C standard with GNU extensions
1672
1673 std=gnu90
1674 C ObjC
1675 Conform to the ISO 1990 C standard with GNU extensions
1676
1677 std=gnu99
1678 C ObjC
1679 Conform to the ISO 1999 C standard with GNU extensions
1680
1681 std=gnu9x
1682 C ObjC Alias(std=gnu99)
1683 Deprecated in favor of -std=gnu99
1684
1685 std=iso9899:1990
1686 C ObjC Alias(std=c90)
1687 Conform to the ISO 1990 C standard
1688
1689 std=iso9899:199409
1690 C ObjC
1691 Conform to the ISO 1990 C standard as amended in 1994
1692
1693 std=iso9899:1999
1694 C ObjC Alias(std=c99)
1695 Conform to the ISO 1999 C standard
1696
1697 std=iso9899:199x
1698 C ObjC Alias(std=c99)
1699 Deprecated in favor of -std=iso9899:1999
1700
1701 std=iso9899:2011
1702 C ObjC Alias(std=c11)
1703 Conform to the ISO 2011 C standard (experimental and incomplete support)
1704
1705 traditional
1706 Driver
1707
1708 traditional-cpp
1709 C ObjC C++ ObjC++
1710 Enable traditional preprocessing
1711
1712 trigraphs
1713 C ObjC C++ ObjC++
1714 -trigraphs      Support ISO C trigraphs
1715
1716 undef
1717 C ObjC C++ ObjC++ Var(flag_undef)
1718 Do not predefine system-specific and GCC-specific macros
1719
1720 v
1721 C ObjC C++ ObjC++
1722 ; Documented in common.opt
1723
1724 w
1725 C ObjC C++ ObjC++
1726 ; Documented in common.opt
1727
1728 ; This comment is to ensure we retain the blank line above.