gcc/c-family/c.opt

   1 ; Options for the C, ObjC, C++ and ObjC++ front ends.
   2 ; Copyright (C) 2003-2016 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) Warning 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 Wframe-address
 299 C ObjC C++ ObjC++ Var(warn_frame_address) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 300 Warn when __builtin_frame_address or __builtin_return_address is used unsafely.
 301
 302 Wbuiltin-macro-redefined
 303 C ObjC C++ ObjC++ CPP(warn_builtin_macro_redefined) CppReason(CPP_W_BUILTIN_MACRO_REDEFINED) Var(cpp_warn_builtin_macro_redefined) Init(1) Warning
 304 Warn when a built-in preprocessor macro is undefined or redefined.
 305
 306 Wc90-c99-compat
 307 C ObjC CPP(cpp_warn_c90_c99_compat) CppReason(CPP_W_C90_C99_COMPAT) Var(warn_c90_c99_compat) Init(-1) Warning
 308 Warn about features not present in ISO C90, but present in ISO C99.
 309
 310 Wc99-c11-compat
 311 C ObjC Var(warn_c99_c11_compat) Init(-1) Warning
 312 Warn about features not present in ISO C99, but present in ISO C11.
 313
 314 Wc++-compat
 315 C ObjC Var(warn_cxx_compat) CPP(warn_cxx_operator_names) CppReason(CPP_W_CXX_OPERATOR_NAMES) Init(0) Warning
 316 Warn about C constructs that are not in the common subset of C and C++.
 317
 318 Wc++0x-compat
 319 C++ ObjC++ Warning Alias(Wc++11-compat) Undocumented
 320
 321 Wc++11-compat
 322 C++ ObjC++ Var(warn_cxx11_compat) Warning LangEnabledBy(C++ ObjC++,Wall) Init(0) CPP(cpp_warn_cxx11_compat) CppReason(CPP_W_CXX11_COMPAT)
 323 Warn about C++ constructs whose meaning differs between ISO C++ 1998 and ISO C++ 2011.
 324
 325 Wc++14-compat
 326 C++ ObjC++ Var(warn_cxx14_compat) Warning LangEnabledBy(C++ ObjC++,Wall)
 327 Warn about C++ constructs whose meaning differs between ISO C++ 2011 and ISO C++ 2014.
 328
 329 Wcast-qual
 330 C ObjC C++ ObjC++ Var(warn_cast_qual) Warning
 331 Warn about casts which discard qualifiers.
 332
 333 Wchar-subscripts
 334 C ObjC C++ ObjC++ Var(warn_char_subscripts) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 335 Warn about subscripts whose type is \"char\".
 336
 337 Wchkp
 338 C ObjC C++ ObjC++ Var(warn_chkp) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 339 Warn about memory access errors found by Pointer Bounds Checker.
 340
 341 Wclobbered
 342 C ObjC C++ ObjC++ Var(warn_clobbered) Warning EnabledBy(Wextra)
 343 Warn about variables that might be changed by \"longjmp\" or \"vfork\".
 344
 345 Wcomment
 346 C ObjC C++ ObjC++ CPP(warn_comments) CppReason(CPP_W_COMMENTS) Var(cpp_warn_comment) Init(0) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 347 Warn about possibly nested block comments, and C++ comments spanning more than one physical line.
 348
 349 Wcomments
 350 C ObjC C++ ObjC++ Warning Alias(Wcomment)
 351 Synonym for -Wcomment.
 352
 353 Wconditionally-supported
 354 C++ ObjC++ Var(warn_conditionally_supported) Warning
 355 Warn for conditionally-supported constructs.
 356
 357 Wconversion
 358 C ObjC C++ ObjC++ Var(warn_conversion) Warning
 359 Warn for implicit type conversions that may change a value.
 360
 361 Wconversion-null
 362 C++ ObjC++ Var(warn_conversion_null) Init(1) Warning
 363 Warn for converting NULL from/to a non-pointer type.
 364
 365 Wcpp
 366 C ObjC C++ ObjC++ CppReason(CPP_W_WARNING_DIRECTIVE)
 367 ; Documented in common.opt
 368
 369 Wctor-dtor-privacy
 370 C++ ObjC++ Var(warn_ctor_dtor_privacy) Warning
 371 Warn when all constructors and destructors are private.
 372
 373 Wdangling-else
 374 C ObjC C++ ObjC++ Var(warn_dangling_else) Warning LangEnabledBy(C ObjC C++ ObjC++,Wparentheses)
 375 Warn about dangling else.
 376
 377 Wdate-time
 378 C ObjC C++ ObjC++ CPP(warn_date_time) CppReason(CPP_W_DATE_TIME) Var(cpp_warn_date_time) Init(0) Warning
 379 Warn about __TIME__, __DATE__ and __TIMESTAMP__ usage.
 380
 381 Wdeclaration-after-statement
 382 C ObjC Var(warn_declaration_after_statement) Init(-1) Warning
 383 Warn when a declaration is found after a statement.
 384
 385 Wdelete-incomplete
 386 C++ ObjC++ Var(warn_delete_incomplete) Init(1) Warning
 387 Warn when deleting a pointer to incomplete type.
 388
 389 Wdelete-non-virtual-dtor
 390 C++ ObjC++ Var(warn_delnonvdtor) Warning LangEnabledBy(C++ ObjC++,Wall || Weffc++)
 391 Warn about deleting polymorphic objects with non-virtual destructors.
 392
 393 Wdeprecated
 394 C C++ ObjC ObjC++ CPP(cpp_warn_deprecated) CppReason(CPP_W_DEPRECATED) Var(warn_deprecated) Init(1) Warning
 395 Warn if a deprecated compiler feature, class, method, or field is used.
 396
 397 Wdesignated-init
 398 C ObjC Var(warn_designated_init) Init(1) Warning
 399 Warn about positional initialization of structs requiring designated initializers.
 400
 401 Wdiscarded-array-qualifiers
 402 C ObjC Var(warn_discarded_array_qualifiers) Init(1) Warning
 403 Warn if qualifiers on arrays which are pointer targets are discarded.
 404
 405 Wdiscarded-qualifiers
 406 C ObjC Var(warn_discarded_qualifiers) Init(1) Warning
 407 Warn if type qualifiers on pointers are discarded.
 408
 409 Wdiv-by-zero
 410 C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1) Warning
 411 Warn about compile-time integer division by zero.
 412
 413 Wduplicated-cond
 414 C ObjC C++ ObjC++ Var(warn_duplicated_cond) Init(0) Warning
 415 Warn about duplicated conditions in an if-else-if chain.
 416
 417 Weffc++
 418 C++ ObjC++ Var(warn_ecpp) Warning
 419 Warn about violations of Effective C++ style rules.
 420
 421 Wempty-body
 422 C ObjC C++ ObjC++ Var(warn_empty_body) Warning EnabledBy(Wextra)
 423 Warn about an empty body in an if or else statement.
 424
 425 Wendif-labels
 426 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)
 427 Warn about stray tokens after #elif and #endif.
 428
 429 Wenum-compare
 430 C ObjC C++ ObjC++ Var(warn_enum_compare) Init(-1) Warning LangEnabledBy(C ObjC,Wall || Wc++-compat)
 431 Warn about comparison of different enum types.
 432
 433 Werror
 434 C ObjC C++ ObjC++
 435 ; Documented in common.opt
 436
 437 Werror-implicit-function-declaration
 438 C ObjC RejectNegative Warning Alias(Werror=, implicit-function-declaration)
 439 This switch is deprecated; use -Werror=implicit-function-declaration instead.
 440
 441 Wfloat-conversion
 442 C ObjC C++ ObjC++ Var(warn_float_conversion) Warning LangEnabledBy(C ObjC C++ ObjC++,Wconversion)
 443 Warn for implicit type conversions that cause loss of floating point precision.
 444
 445 Wfloat-equal
 446 C ObjC C++ ObjC++ Var(warn_float_equal) Warning
 447 Warn if testing floating point numbers for equality.
 448
 449 Wformat
 450 C ObjC C++ ObjC++ Warning Alias(Wformat=, 1, 0)
 451 Warn about printf/scanf/strftime/strfmon format string anomalies.
 452
 453 Wformat-contains-nul
 454 C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
 455 Warn about format strings that contain NUL bytes.
 456
 457 Wformat-extra-args
 458 C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
 459 Warn if passing too many arguments to a function for its format string.
 460
 461 Wformat-nonliteral
 462 C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
 463 Warn about format strings that are not literals.
 464
 465 Wformat-security
 466 C ObjC C++ ObjC++ Var(warn_format_security) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
 467 Warn about possible security problems with format functions.
 468
 469 Wformat-signedness
 470 C ObjC C++ ObjC++ Var(warn_format_signedness) Warning
 471 Warn about sign differences with format functions.
 472
 473 Wformat-y2k
 474 C ObjC C++ ObjC++ Var(warn_format_y2k) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 2, 0)
 475 Warn about strftime formats yielding 2-digit years.
 476
 477 Wformat-zero-length
 478 C ObjC C++ ObjC++ Var(warn_format_zero_length) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1, 0)
 479 Warn about zero-length formats.
 480
 481 Wformat=
 482 C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_format) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
 483 Warn about printf/scanf/strftime/strfmon format string anomalies.
 484
 485 Wignored-qualifiers
 486 C C++ Var(warn_ignored_qualifiers) Warning EnabledBy(Wextra)
 487 Warn whenever type qualifiers are ignored.
 488
 489 Wignored-attributes
 490 C C++ Var(warn_ignored_attributes) Init(1) Warning
 491 Warn whenever attributes are ignored.
 492
 493 Wincompatible-pointer-types
 494 C ObjC Var(warn_incompatible_pointer_types) Init(1) Warning
 495 Warn when there is a conversion between pointers that have incompatible types.
 496
 497 Winit-self
 498 C ObjC C++ ObjC++ Var(warn_init_self) Warning LangEnabledBy(C++ ObjC++,Wall)
 499 Warn about variables which are initialized to themselves.
 500
 501 Wimplicit
 502 C ObjC Var(warn_implicit) Warning LangEnabledBy(C ObjC,Wall)
 503 Warn about implicit declarations.
 504
 505 Wdouble-promotion
 506 C ObjC C++ ObjC++ Var(warn_double_promotion) Warning
 507 Warn about implicit conversions from \"float\" to \"double\".
 508
 509 Wimplicit-function-declaration
 510 C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning LangEnabledBy(C ObjC,Wimplicit)
 511 Warn about implicit function declarations.
 512
 513 Wimplicit-int
 514 C ObjC Var(warn_implicit_int) Init(-1) Warning LangEnabledBy(C ObjC,Wimplicit)
 515 Warn when a declaration does not specify a type.
 516
 517 Wimport
 518 C ObjC C++ ObjC++ Undocumented Ignore
 519
 520 Winherited-variadic-ctor
 521 C++ ObjC++ Var(warn_inh_var_ctor) Init(1) Warning
 522 Warn about C++11 inheriting constructors when the base has a variadic constructor.
 523
 524 Wint-conversion
 525 C ObjC Var(warn_int_conversion) Init(1) Warning
 526 Warn about incompatible integer to pointer and pointer to integer conversions.
 527
 528 Wint-to-pointer-cast
 529 C ObjC C++ ObjC++ Var(warn_int_to_pointer_cast) Init(1) Warning
 530 Warn when there is a cast to a pointer from an integer of a different size.
 531
 532 Winvalid-offsetof
 533 C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning
 534 Warn about invalid uses of the \"offsetof\" macro.
 535
 536 Winvalid-pch
 537 C ObjC C++ ObjC++ CPP(warn_invalid_pch) CppReason(CPP_W_INVALID_PCH) Var(cpp_warn_invalid_pch) Init(0) Warning
 538 Warn about PCH files that are found but not used.
 539
 540 Wjump-misses-init
 541 C ObjC Var(warn_jump_misses_init) Warning LangEnabledby(C ObjC,Wc++-compat)
 542 Warn when a jump misses a variable initialization.
 543
 544 Wliteral-suffix
 545 C++ ObjC++ CPP(warn_literal_suffix) CppReason(CPP_W_LITERAL_SUFFIX) Var(cpp_warn_literal_suffix) Init(1) Warning
 546 Warn when a string or character literal is followed by a ud-suffix which does not begin with an underscore.
 547
 548 Wlogical-op
 549 C ObjC C++ ObjC++ Var(warn_logical_op) Init(0) Warning
 550 Warn when a logical operator is suspiciously always evaluating to true or false.
 551
 552 Wlogical-not-parentheses
 553 C ObjC C++ ObjC++ Var(warn_logical_not_paren) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 554 Warn when logical not is used on the left hand side operand of a comparison.
 555
 556 Wlong-long
 557 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)
 558 Do not warn about using \"long long\" when -pedantic.
 559
 560 Wmain
 561 C ObjC C++ ObjC++ Var(warn_main) Init(-1) Warning LangEnabledBy(C ObjC,Wall, 2, 0)
 562 Warn about suspicious declarations of \"main\".
 563
 564 Wmain
 565 LangEnabledBy(C ObjC C++ ObjC++,Wpedantic, 2, 0)
 566 ;
 567
 568 Wmemset-transposed-args
 569 C ObjC C++ ObjC++ Var(warn_memset_transposed_args) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 570 Warn about suspicious calls to memset where the third argument is constant literal zero and the second is not.
 571
 572 Wmemset-elt-size
 573 C ObjC C++ ObjC++ Var(warn_memset_elt_size) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 574 Warn about suspicious calls to memset where the third argument contains the number of elements not multiplied by the element size.
 575
 576 Wmisleading-indentation
 577 C C++ Common Var(warn_misleading_indentation) Warning LangEnabledBy(C C++,Wall)
 578 Warn when the indentation of the code does not reflect the block structure.
 579
 580 Wmissing-braces
 581 C ObjC C++ ObjC++ Var(warn_missing_braces) Warning LangEnabledBy(C ObjC,Wall)
 582 Warn about possibly missing braces around initializers.
 583
 584 Wmissing-declarations
 585 C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning
 586 Warn about global functions without previous declarations.
 587
 588 Wmissing-field-initializers
 589 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Warning EnabledBy(Wextra)
 590 Warn about missing fields in struct initializers.
 591
 592 Wmultiple-inheritance
 593 C++ ObjC++ Var(warn_multiple_inheritance) Warning
 594 Warn on direct multiple inheritance.
 595
 596 Wnamespaces
 597 C++ ObjC++ Var(warn_namespaces) Warning
 598 Warn on namespace definition.
 599
 600 Wsized-deallocation
 601 C++ ObjC++ Var(warn_sized_deallocation) Warning EnabledBy(Wextra)
 602 Warn about missing sized deallocation functions.
 603
 604 Wsizeof-pointer-memaccess
 605 C ObjC C++ ObjC++ Var(warn_sizeof_pointer_memaccess) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 606 Warn about suspicious length parameters to certain string functions if the argument uses sizeof.
 607
 608 Wsizeof-array-argument
 609 C ObjC C++ ObjC++ Var(warn_sizeof_array_argument) Warning Init(1)
 610 Warn when sizeof is applied on a parameter declared as an array.
 611
 612 Wsuggest-attribute=format
 613 C ObjC C++ ObjC++ Var(warn_suggest_attribute_format) Warning
 614 Warn about functions which might be candidates for format attributes.
 615
 616 Wsuggest-override
 617 C++ ObjC++ Var(warn_override) Warning
 618 Suggest that the override keyword be used when the declaration of a virtual
 619 function overrides another.
 620
 621 Wswitch
 622 C ObjC C++ ObjC++ Var(warn_switch) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 623 Warn about enumerated switches, with no default, missing a case.
 624
 625 Wswitch-default
 626 C ObjC C++ ObjC++ Var(warn_switch_default) Warning
 627 Warn about enumerated switches missing a \"default:\" statement.
 628
 629 Wswitch-enum
 630 C ObjC C++ ObjC++ Var(warn_switch_enum) Warning
 631 Warn about all enumerated switches missing a specific case.
 632
 633 Wswitch-bool
 634 C ObjC C++ ObjC++ Var(warn_switch_bool) Warning Init(1)
 635 Warn about switches with boolean controlling expression.
 636
 637 Wtemplates
 638 C++ ObjC++ Var(warn_templates) Warning
 639 Warn on primary template declaration.
 640
 641 Wmissing-format-attribute
 642 C ObjC C++ ObjC++ Warning Alias(Wsuggest-attribute=format)
 643 ;
 644
 645 Wmissing-include-dirs
 646 C ObjC C++ ObjC++ CPP(warn_missing_include_dirs) CppReason(CPP_W_MISSING_INCLUDE_DIRS) Var(cpp_warn_missing_include_dirs) Init(0) Warning
 647 Warn about user-specified include directories that do not exist.
 648
 649 Wmissing-parameter-type
 650 C ObjC Var(warn_missing_parameter_type) Warning EnabledBy(Wextra)
 651 Warn about function parameters declared without a type specifier in K&R-style functions.
 652
 653 Wmissing-prototypes
 654 C ObjC Var(warn_missing_prototypes) Warning
 655 Warn about global functions without prototypes.
 656
 657 Wmudflap
 658 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
 659
 660 Wmultichar
 661 C ObjC C++ ObjC++ CPP(warn_multichar) CppReason(CPP_W_MULTICHAR) Var(cpp_warn_multichar) Init(0) Warning
 662 Warn about use of multi-character character constants.
 663
 664 Wnarrowing
 665 C ObjC C++ ObjC++ Warning Var(warn_narrowing) Init(-1) LangEnabledBy(C++ ObjC++,Wall || Wc++11-compat)
 666 Warn about narrowing conversions within { } that are ill-formed in C++11.
 667
 668 Wnested-externs
 669 C ObjC Var(warn_nested_externs) Warning
 670 Warn about \"extern\" declarations not at file scope.
 671
 672 Wnoexcept
 673 C++ ObjC++ Var(warn_noexcept) Warning
 674 Warn when a noexcept expression evaluates to false even though the expression can't actually throw.
 675
 676 Wnon-template-friend
 677 C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning
 678 Warn when non-templatized friend functions are declared within a template.
 679
 680 Wnon-virtual-dtor
 681 C++ ObjC++ Var(warn_nonvdtor) Warning LangEnabledBy(C++ ObjC++,Weffc++)
 682 Warn about non-virtual destructors.
 683
 684 Wnonnull
 685 C ObjC C++ ObjC++ Var(warn_nonnull) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1,0)
 686 Warn about NULL being passed to argument slots marked as requiring non-NULL.
 687
 688 Wnonnull
 689 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
 690 ;
 691
 692 Wnonnull-compare
 693 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
 694 ;
 695
 696 Wnormalized
 697 C ObjC C++ ObjC++ Warning Alias(Wnormalized=,nfc,none)
 698 ;
 699
 700 Wnormalized=
 701 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)
 702 -Wnormalized=<none|id|nfc|nfkc> Warn about non-normalised Unicode strings.
 703
 704 ; Required for these enum values.
 705 SourceInclude
 706 cpplib.h
 707
 708 Enum
 709 Name(cpp_normalize_level) Type(int) UnknownError(argument %qs to %<-Wnormalized%> not recognized)
 710
 711 EnumValue
 712 Enum(cpp_normalize_level) String(none) Value(normalized_none)
 713
 714 EnumValue
 715 Enum(cpp_normalize_level) String(nfkc) Value(normalized_KC)
 716
 717 EnumValue
 718 Enum(cpp_normalize_level) String(id) Value(normalized_identifier_C)
 719
 720 EnumValue
 721 Enum(cpp_normalize_level) String(nfc) Value(normalized_C)
 722
 723 Wold-style-cast
 724 C++ ObjC++ Var(warn_old_style_cast) Warning
 725 Warn if a C-style cast is used in a program.
 726
 727 Wold-style-declaration
 728 C ObjC Var(warn_old_style_declaration) Warning EnabledBy(Wextra)
 729 Warn for obsolescent usage in a declaration.
 730
 731 Wold-style-definition
 732 C ObjC Var(warn_old_style_definition) Warning
 733 Warn if an old-style parameter definition is used.
 734
 735 Wopenmp-simd
 736 C C++ Var(warn_openmp_simd) Warning LangEnabledBy(C C++,Wall)
 737 Warn if a simd directive is overridden by the vectorizer cost model.
 738
 739 Woverlength-strings
 740 C ObjC C++ ObjC++ Var(warn_overlength_strings) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
 741 Warn if a string is longer than the maximum portable length specified by the standard.
 742
 743 Woverloaded-virtual
 744 C++ ObjC++ Var(warn_overloaded_virtual) Warning
 745 Warn about overloaded virtual function names.
 746
 747 Woverride-init
 748 C ObjC Var(warn_override_init) Warning EnabledBy(Wextra)
 749 Warn about overriding initializers without side effects.
 750
 751 Woverride-init-side-effects
 752 C ObjC Var(warn_override_init_side_effects) Init(1) Warning
 753 Warn about overriding initializers with side effects.
 754
 755 Wpacked-bitfield-compat
 756 C ObjC C++ ObjC++ Var(warn_packed_bitfield_compat) Init(-1) Warning
 757 Warn about packed bit-fields whose offset changed in GCC 4.4.
 758
 759 Wparentheses
 760 C ObjC C++ ObjC++ Var(warn_parentheses) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 761 Warn about possibly missing parentheses.
 762
 763 Wpedantic
 764 C ObjC C++ ObjC++ CPP(cpp_pedantic) CppReason(CPP_W_PEDANTIC) Warning
 765 ; Documented in common.opt
 766
 767 Wpmf-conversions
 768 C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning
 769 Warn when converting the type of pointers to member functions.
 770
 771 Wpointer-arith
 772 C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
 773 Warn about function pointer arithmetic.
 774
 775 Wpointer-sign
 776 C ObjC Var(warn_pointer_sign) Warning LangEnabledBy(C ObjC,Wall || Wpedantic)
 777 Warn when a pointer differs in signedness in an assignment.
 778
 779 Wpointer-to-int-cast
 780 C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning
 781 Warn when a pointer is cast to an integer of a different size.
 782
 783 Wpragmas
 784 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning
 785 Warn about misuses of pragmas.
 786
 787 Wproperty-assign-default
 788 ObjC ObjC++ Var(warn_property_assign_default) Init(1) Warning
 789 Warn if a property for an Objective-C object has no assign semantics specified.
 790
 791 Wprotocol
 792 ObjC ObjC++ Var(warn_protocol) Init(1) Warning
 793 Warn if inherited methods are unimplemented.
 794
 795 Wplacement-new
 796 C++ Warning Alias(Wplacement-new=, 1, 0)
 797 Warn for placement new expressions with undefined behavior.
 798
 799 Wplacement-new=
 800 C++ Joined RejectNegative UInteger Var(warn_placement_new) Init(-1) Warning
 801 Warn for placement new expressions with undefined behavior.
 802
 803 Wredundant-decls
 804 C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning
 805 Warn about multiple declarations of the same object.
 806
 807 Wreorder
 808 C++ ObjC++ Var(warn_reorder) Warning LangEnabledBy(C++ ObjC++,Wall)
 809 Warn when the compiler reorders code.
 810
 811 Wreturn-type
 812 C ObjC C++ ObjC++ Var(warn_return_type) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 813 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++).
 814
 815 Wscalar-storage-order
 816 C ObjC C++ ObjC++ Init(1) Warning
 817 Warn on suspicious constructs involving reverse scalar storage order.
 818
 819 Wselector
 820 ObjC ObjC++ Var(warn_selector) Warning
 821 Warn if a selector has multiple methods.
 822
 823 Wsequence-point
 824 C ObjC C++ ObjC++ Var(warn_sequence_point) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 825 Warn about possible violations of sequence point rules.
 826
 827 Wshadow-ivar
 828 ObjC ObjC++ Var(warn_shadow_ivar) EnabledBy(Wshadow) Init(1) Warning
 829 Warn if a local declaration hides an instance variable.
 830
 831 Wshift-overflow
 832 C ObjC C++ ObjC++ Warning Alias(Wshift-overflow=, 1, 0)
 833 Warn if left shift of a signed value overflows.
 834
 835 Wshift-overflow=
 836 C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_shift_overflow) Init(-1) Warning
 837 Warn if left shift of a signed value overflows.
 838
 839 Wshift-count-negative
 840 C ObjC C++ ObjC++ Var(warn_shift_count_negative) Init(1) Warning
 841 Warn if shift count is negative.
 842
 843 Wshift-count-overflow
 844 C ObjC C++ ObjC++ Var(warn_shift_count_overflow) Init(1) Warning
 845 Warn if shift count >= width of type.
 846
 847 Wshift-negative-value
 848 C ObjC C++ ObjC++ Var(warn_shift_negative_value) Init(-1) Warning
 849 Warn if left shifting a negative value.
 850
 851 Wsign-compare
 852 C ObjC C++ ObjC++ Var(warn_sign_compare) Warning LangEnabledBy(C++ ObjC++,Wall)
 853 Warn about signed-unsigned comparisons.
 854
 855 Wsign-compare
 856 C ObjC C++ ObjC++ EnabledBy(Wextra)
 857 ;
 858
 859 Wsign-conversion
 860 C ObjC C++ ObjC++ Var(warn_sign_conversion) Warning LangEnabledBy(C ObjC,Wconversion)
 861 Warn for implicit type conversions between signed and unsigned integers.
 862
 863 Wsign-promo
 864 C++ ObjC++ Var(warn_sign_promo) Warning
 865 Warn when overload promotes from unsigned to signed.
 866
 867 Wstrict-null-sentinel
 868 C++ ObjC++ Warning Var(warn_strict_null_sentinel)
 869 Warn about uncasted NULL used as sentinel.
 870
 871 Wstrict-prototypes
 872 C ObjC Var(warn_strict_prototypes) Warning
 873 Warn about unprototyped function declarations.
 874
 875 Wstrict-aliasing=
 876 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 3, 0)
 877 ;
 878
 879 Wstrict-overflow=
 880 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
 881 ;
 882
 883 Wstrict-selector-match
 884 ObjC ObjC++ Var(warn_strict_selector_match) Warning
 885 Warn if type signatures of candidate methods do not match exactly.
 886
 887 Wsync-nand
 888 C C++ Var(warn_sync_nand) Init(1) Warning
 889 Warn when __sync_fetch_and_nand and __sync_nand_and_fetch built-in functions are used.
 890
 891 Wsynth
 892 C++ ObjC++ Var(warn_synth) Warning
 893 Deprecated.  This switch has no effect.
 894
 895 Wsystem-headers
 896 C ObjC C++ ObjC++ Warning
 897 ; Documented in common.opt
 898
 899 Wtautological-compare
 900 C ObjC C++ ObjC++ Var(warn_tautological_compare) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 901 Warn if a comparison always evaluates to true or false.
 902
 903 Wterminate
 904 C++ ObjC++ Warning Var(warn_terminate) Init(1)
 905 Warn if a throw expression will always result in a call to terminate().
 906
 907 Wtraditional
 908 C ObjC CPP(cpp_warn_traditional) CppReason(CPP_W_TRADITIONAL) Var(warn_traditional) Init(0) Warning
 909 Warn about features not present in traditional C.
 910
 911 Wtraditional-conversion
 912 C ObjC Var(warn_traditional_conversion) Warning
 913 Warn of prototypes causing type conversions different from what would happen in the absence of prototype.
 914
 915 Wtrigraphs
 916 C ObjC C++ ObjC++ CPP(warn_trigraphs) CppReason(CPP_W_TRIGRAPHS) Var(cpp_warn_trigraphs) Init(2) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 917 Warn if trigraphs are encountered that might affect the meaning of the program.
 918
 919 Wundeclared-selector
 920 ObjC ObjC++ Var(warn_undeclared_selector) Warning
 921 Warn about @selector()s without previously declared methods.
 922
 923 Wundef
 924 C ObjC C++ ObjC++ CPP(warn_undef) CppReason(CPP_W_UNDEF) Var(cpp_warn_undef) Init(0) Warning
 925 Warn if an undefined macro is used in an #if directive.
 926
 927 Wuninitialized
 928 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
 929 ;
 930
 931 Wmaybe-uninitialized
 932 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
 933 ;
 934
 935 Wunknown-pragmas
 936 C ObjC C++ ObjC++ Warning Var(warn_unknown_pragmas) LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
 937 Warn about unrecognized pragmas.
 938
 939 Wunsuffixed-float-constants
 940 C ObjC Var(warn_unsuffixed_float_constants) Warning
 941 Warn about unsuffixed float constants.
 942
 943 Wunused
 944 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
 945 ; documented in common.opt
 946
 947 Wunused-local-typedefs
 948 C ObjC C++ ObjC++ Var(warn_unused_local_typedefs) Warning EnabledBy(Wunused)
 949 Warn when typedefs locally defined in a function are not used.
 950
 951 Wunused-macros
 952 C ObjC C++ ObjC++ CppReason(CPP_W_UNUSED_MACROS) Var(cpp_warn_unused_macros) Warning
 953 Warn about macros defined in the main file that are not used.
 954
 955 Wunused-result
 956 C ObjC C++ ObjC++ Var(warn_unused_result) Init(1) Warning
 957 Warn if a caller of a function, marked with attribute warn_unused_result, does not use its return value.
 958
 959 Wunused-variable
 960 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wunused)
 961 ; documented in common.opt
 962
 963 Wunused-const-variable
 964 C ObjC C++ ObjC++ Warning Alias(Wunused-const-variable=, 2, 0)
 965 Warn when a const variable is unused.
 966
 967 Wunused-const-variable=
 968 C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_unused_const_variable) Warning LangEnabledBy(C ObjC,Wunused-variable, 1, 0)
 969 Warn when a const variable is unused.
 970
 971 Wvariadic-macros
 972 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)
 973 Warn about using variadic macros.
 974
 975 Wvarargs
 976 C ObjC C++ ObjC++ Warning Var(warn_varargs) Init(1)
 977 Warn about questionable usage of the macros used to retrieve variable arguments.
 978
 979 Wvla
 980 C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning
 981 Warn if a variable length array is used.
 982
 983 Wvolatile-register-var
 984 C ObjC C++ ObjC++ Var(warn_volatile_register_var) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
 985 Warn when a register variable is declared volatile.
 986
 987 Wvirtual-inheritance
 988 C++ ObjC++ Var(warn_virtual_inheritance) Warning
 989 Warn on direct virtual inheritance.
 990
 991 Wvirtual-move-assign
 992 C++ ObjC++ Var(warn_virtual_move_assign) Warning Init(1)
 993 Warn if a virtual base has a non-trivial move assignment operator.
 994
 995 Wwrite-strings
 996 C ObjC C++ ObjC++ Var(warn_write_strings) Warning
 997 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.
 998
 999 Wzero-as-null-pointer-constant
1000 C++ ObjC++ Var(warn_zero_as_null_pointer_constant) Warning
1001 Warn when a literal '0' is used as null pointer.
1002
1003 Wuseless-cast
1004 C++ ObjC++ Var(warn_useless_cast) Warning
1005 Warn about useless casts.
1006
1007 Wsubobject-linkage
1008 C++ ObjC++ Var(warn_subobject_linkage) Warning Init(1)
1009 Warn if a class type has a base or a field whose type uses the anonymous namespace or depends on a type with no linkage.
1010
1011 Wduplicate-decl-specifier
1012 C ObjC Var(warn_duplicate_decl_specifier) Warning LangEnabledBy(C ObjC,Wall)
1013 Warn when a declaration has duplicate const, volatile, restrict or _Atomic specifier.
1014
1015 ansi
1016 C ObjC C++ ObjC++
1017 A synonym for -std=c89 (for C) or -std=c++98 (for C++).
1018
1019 d
1020 C ObjC C++ ObjC++ Joined
1021 ; Documented in common.opt.  FIXME - what about -dI, -dD, -dN and -dD?
1022
1023 fabi-compat-version=
1024 C++ ObjC++ Joined RejectNegative UInteger Var(flag_abi_compat_version) Init(-1)
1025 The version of the C++ ABI used for -Wabi warnings and link compatibility aliases.
1026
1027 faccess-control
1028 C++ ObjC++ Var(flag_access_control) Init(1)
1029 Enforce class member access control semantics.
1030
1031 fada-spec-parent=
1032 C ObjC C++ ObjC++ RejectNegative Joined Var(ada_specs_parent)
1033 -fada-spec-parent=unit  Dump Ada specs as child units of given parent.
1034
1035 fall-virtual
1036 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1037
1038 fallow-parameterless-variadic-functions
1039 C ObjC Var(flag_allow_parameterless_variadic_functions)
1040 Allow variadic functions without named parameter.
1041
1042 falt-external-templates
1043 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1044 No longer supported.
1045
1046 fasm
1047 C ObjC C++ ObjC++ Var(flag_no_asm, 0)
1048 Recognize the \"asm\" keyword.
1049
1050 ; Define extra predefined macros for use in libgcc.
1051 fbuilding-libgcc
1052 C ObjC C++ ObjC++ Undocumented Var(flag_building_libgcc)
1053
1054 fbuiltin
1055 C ObjC C++ ObjC++ Var(flag_no_builtin, 0)
1056 Recognize built-in functions.
1057
1058 fbuiltin-
1059 C ObjC C++ ObjC++ Joined
1060
1061 fcanonical-system-headers
1062 C ObjC C++ ObjC++
1063 Where shorter, use canonicalized paths to systems headers.
1064
1065 fcheck-pointer-bounds
1066 C ObjC C++ ObjC++ LTO Report Var(flag_check_pointer_bounds)
1067 Add Pointer Bounds Checker instrumentation.  fchkp-* flags are used to
1068 control instrumentation.  Currently available for C, C++ and ObjC.
1069
1070 fchkp-check-incomplete-type
1071 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_incomplete_type) Init(1)
1072 Generate pointer bounds checks for variables with incomplete type.
1073
1074 fchkp-zero-input-bounds-for-main
1075 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_zero_input_bounds_for_main) Init(0)
1076 Use zero bounds for all incoming arguments in 'main' function.  It helps when
1077 instrumented binaries are used with legacy libs.
1078
1079 fchkp-first-field-has-own-bounds
1080 C ObjC C++ ObjC++ LTO RejectNegative Report Var(flag_chkp_first_field_has_own_bounds)
1081 Forces Pointer Bounds Checker to use narrowed bounds for address of the first
1082 field in the structure.  By default pointer to the first field has the same
1083 bounds as pointer to the whole structure.
1084
1085 fchkp-narrow-bounds
1086 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_narrow_bounds) Init(1)
1087 Control how Pointer Bounds Checker handle pointers to object fields.  When
1088 narrowing is on, field bounds are used.  Otherwise full object bounds are used.
1089
1090 fchkp-narrow-to-innermost-array
1091 C ObjC C++ ObjC++ LTO RejectNegative Report Var(flag_chkp_narrow_to_innermost_arrray)
1092 Forces Pointer Bounds Checker to use bounds of the innermost arrays in case of
1093 nested static arryas access.  By default outermost array is used.
1094
1095 fchkp-optimize
1096 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_optimize) Init(-1)
1097 Allow Pointer Bounds Checker optimizations.  By default allowed
1098 on optimization levels >0.
1099
1100 fchkp-use-fast-string-functions
1101 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_fast_string_functions) Init(0)
1102 Allow to use *_nobnd versions of string functions by Pointer Bounds Checker.
1103
1104 fchkp-use-nochk-string-functions
1105 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_nochk_string_functions) Init(0)
1106 Allow to use *_nochk versions of string functions by Pointer Bounds Checker.
1107
1108 fchkp-use-static-bounds
1109 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_static_bounds) Init(1)
1110 Use statically initialized variable for vars bounds instead of
1111 generating them each time it is required.
1112
1113 fchkp-use-static-const-bounds
1114 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_static_const_bounds) Init(-1)
1115 Use statically initialized variable for constant bounds instead of
1116 generating them each time it is required.
1117
1118 fchkp-treat-zero-dynamic-size-as-infinite
1119 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_zero_dynamic_size_as_infinite) Init(0)
1120 With this option zero size obtained dynamically for objects with
1121 incomplete type will be treated as infinite.
1122
1123 fchkp-check-read
1124 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_check_read) Init(1)
1125 Generate checks for all read accesses to memory.
1126
1127 fchkp-check-write
1128 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_check_write) Init(1)
1129 Generate checks for all write accesses to memory.
1130
1131 fchkp-store-bounds
1132 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_store_bounds) Init(1)
1133 Generate bounds stores for pointer writes.
1134
1135 fchkp-instrument-calls
1136 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_instrument_calls) Init(1)
1137 Generate bounds passing for calls.
1138
1139 fchkp-instrument-marked-only
1140 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_instrument_marked_only) Init(0)
1141 Instrument only functions marked with bnd_instrument attribute.
1142
1143 fchkp-use-wrappers
1144 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_wrappers) Init(1)
1145 Transform instrumented builtin calls into calls to wrappers.
1146
1147 static-libmpx
1148 Driver
1149
1150 static-libmpxwrappers
1151 Driver
1152
1153 fcilkplus
1154 C ObjC C++ ObjC++ LTO Report Var(flag_cilkplus) Init(0)
1155 Enable Cilk Plus.
1156
1157 fconcepts
1158 C++ ObjC++ Var(flag_concepts)
1159 Enable support for C++ concepts.
1160
1161 fcond-mismatch
1162 C ObjC C++ ObjC++
1163 Allow the arguments of the '?' operator to have different types.
1164
1165 fconserve-space
1166 C++ ObjC++ Var(flag_conserve_space)
1167 Does nothing.  Preserved for backward compatibility.
1168
1169 fconstant-string-class=
1170 ObjC ObjC++ Joined MissingArgError(no class name specified with %qs)
1171 -fconst-string-class=<name>     Use class <name> for constant strings.
1172
1173 fconstexpr-depth=
1174 C++ ObjC++ Joined RejectNegative UInteger Var(max_constexpr_depth) Init(512)
1175 -fconstexpr-depth=<number>      Specify maximum constexpr recursion depth.
1176
1177 fconstexpr-loop-limit=
1178 C++ ObjC++ Joined RejectNegative UInteger Var(constexpr_loop_limit) Init(262144)
1179 -fconstexpr-loop-limit=<number> Specify maximum constexpr loop iteration count.
1180
1181 fdebug-cpp
1182 C ObjC C++ ObjC++
1183 Emit debug annotations during preprocessing.
1184
1185 fdeduce-init-list
1186 C++ ObjC++ Var(flag_deduce_init_list) Init(0)
1187 -fdeduce-init-list      enable deduction of std::initializer_list for a template type parameter from a brace-enclosed initializer-list.
1188
1189 fdeclone-ctor-dtor
1190 C++ ObjC++ Var(flag_declone_ctor_dtor) Init(-1)
1191 Factor complex constructors and destructors to favor space over speed.
1192
1193 fdefault-inline
1194 C++ ObjC++ Ignore
1195 Does nothing.  Preserved for backward compatibility.
1196
1197 fdirectives-only
1198 C ObjC C++ ObjC++
1199 Preprocess directives only.
1200
1201 fdollars-in-identifiers
1202 C ObjC C++ ObjC++
1203 Permit '$' as an identifier character.
1204
1205 fdump-ada-spec
1206 C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec)
1207 Write all declarations as Ada code transitively.
1208
1209 fdump-ada-spec-slim
1210 C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec_slim)
1211 Write all declarations as Ada code for the given file only.
1212
1213 felide-constructors
1214 C++ ObjC++ Var(flag_elide_constructors) Init(1)
1215
1216 fenforce-eh-specs
1217 C++ ObjC++ Var(flag_enforce_eh_specs) Init(1)
1218 Generate code to check exception specifications.
1219
1220 fenum-int-equiv
1221 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1222
1223 fexec-charset=
1224 C ObjC C++ ObjC++ Joined RejectNegative
1225 -fexec-charset=<cset>   Convert all strings and character constants to character set <cset>.
1226
1227 fextended-identifiers
1228 C ObjC C++ ObjC++
1229 Permit universal character names (\\u and \\U) in identifiers.
1230
1231 finput-charset=
1232 C ObjC C++ ObjC++ Joined RejectNegative
1233 -finput-charset=<cset>  Specify the default character set for source files.
1234
1235 fextern-tls-init
1236 C++ ObjC++ Var(flag_extern_tls_init) Init(-1)
1237 Support dynamic initialization of thread-local variables in a different translation unit.
1238
1239 fexternal-templates
1240 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1241
1242 ffor-scope
1243 C++ ObjC++ Var(flag_new_for_scope) Init(1)
1244 Scope of for-init-statement variables is local to the loop.
1245
1246 ffreestanding
1247 C ObjC C++ ObjC++
1248 Do not assume that standard C libraries and \"main\" exist.
1249
1250 fgnu-keywords
1251 C++ ObjC++ Var(flag_no_gnu_keywords, 0)
1252 Recognize GNU-defined keywords.
1253
1254 fgnu-runtime
1255 ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime,0) Init(NEXT_OBJC_RUNTIME)
1256 Generate code for GNU runtime environment.
1257
1258 fgnu89-inline
1259 C ObjC Var(flag_gnu89_inline) Init(-1)
1260 Use traditional GNU semantics for inline functions.
1261
1262 fguiding-decls
1263 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1264
1265 fhandle-exceptions
1266 C++ ObjC++ Optimization Alias(fexceptions) Warn({-fhandle-exceptions has been renamed -fexceptions (and is now on by default)})
1267
1268 fhonor-std
1269 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1270
1271 fhosted
1272 C ObjC
1273 Assume normal C execution environment.
1274
1275 fhuge-objects
1276 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1277 No longer supported.
1278
1279 fimplement-inlines
1280 C++ ObjC++ Var(flag_implement_inlines) Init(1)
1281 Export functions even if they can be inlined.
1282
1283 fimplicit-inline-templates
1284 C++ ObjC++ Var(flag_implicit_inline_templates) Init(1)
1285 Emit implicit instantiations of inline templates.
1286
1287 fimplicit-templates
1288 C++ ObjC++ Var(flag_implicit_templates) Init(1)
1289 Emit implicit instantiations of templates.
1290
1291 ffriend-injection
1292 C++ ObjC++ Var(flag_friend_injection)
1293 Inject friend functions into enclosing namespace.
1294
1295 fkeep-inline-dllexport
1296 C C++ ObjC ObjC++ Var(flag_keep_inline_dllexport) Init(1) Report Condition(TARGET_DLLIMPORT_DECL_ATTRIBUTES)
1297 Don't emit dllexported inline functions unless needed.
1298
1299 flabels-ok
1300 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1301
1302 flax-vector-conversions
1303 C ObjC C++ ObjC++ Var(flag_lax_vector_conversions)
1304 Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types.
1305
1306 fms-extensions
1307 C ObjC C++ ObjC++ Var(flag_ms_extensions)
1308 Don't warn about uses of Microsoft extensions.
1309
1310 fmudflap
1311 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1312
1313 fmudflapth
1314 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1315
1316 fmudflapir
1317 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1318
1319 fname-mangling-version-
1320 C++ ObjC++ Joined Ignore Warn(switch %qs is no longer supported)
1321
1322 fnew-abi
1323 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1324
1325 fnext-runtime
1326 ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime)
1327 Generate code for NeXT (Apple Mac OS X) runtime environment.
1328
1329 fnil-receivers
1330 ObjC ObjC++ Var(flag_nil_receivers) Init(1)
1331 Assume that receivers of Objective-C messages may be nil.
1332
1333 flocal-ivars
1334 ObjC ObjC++ Var(flag_local_ivars) Init(1)
1335 Allow access to instance variables as if they were local declarations within instance method implementations.
1336
1337 fivar-visibility=
1338 ObjC ObjC++ Joined RejectNegative Enum(ivar_visibility) Var(default_ivar_visibility) Init(IVAR_VISIBILITY_PROTECTED)
1339 -fvisibility=[private|protected|public|package] Set the default symbol visibility.
1340
1341 Enum
1342 Name(ivar_visibility) Type(enum ivar_visibility) UnknownError(unrecognized ivar visibility value %qs)
1343
1344 EnumValue
1345 Enum(ivar_visibility) String(private) Value(IVAR_VISIBILITY_PRIVATE)
1346
1347 EnumValue
1348 Enum(ivar_visibility) String(protected) Value(IVAR_VISIBILITY_PROTECTED)
1349
1350 EnumValue
1351 Enum(ivar_visibility) String(public) Value(IVAR_VISIBILITY_PUBLIC)
1352
1353 EnumValue
1354 Enum(ivar_visibility) String(package) Value(IVAR_VISIBILITY_PACKAGE)
1355
1356 fnonansi-builtins
1357 C++ ObjC++ Var(flag_no_nonansi_builtin, 0)
1358
1359 fnonnull-objects
1360 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1361
1362 fnothrow-opt
1363 C++ ObjC++ Optimization Var(flag_nothrow_opt)
1364 Treat a throw() exception specification as noexcept to improve code size.
1365
1366 fobjc-abi-version=
1367 ObjC ObjC++ LTO Joined Report RejectNegative UInteger Var(flag_objc_abi)
1368 Specify which ABI to use for Objective-C family code and meta-data generation.
1369
1370 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
1371 ; to initialize any non-POD ivars in Objective-C++ classes.
1372 fobjc-call-cxx-cdtors
1373 ObjC++ Var(flag_objc_call_cxx_cdtors)
1374 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed.
1375
1376 fobjc-direct-dispatch
1377 ObjC ObjC++ Var(flag_objc_direct_dispatch)
1378 Allow fast jumps to the message dispatcher.
1379
1380 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
1381 ; @try, etc.) in source code.
1382 fobjc-exceptions
1383 ObjC ObjC++ Var(flag_objc_exceptions)
1384 Enable Objective-C exception and synchronization syntax.
1385
1386 fobjc-gc
1387 ObjC ObjC++ LTO Var(flag_objc_gc)
1388 Enable garbage collection (GC) in Objective-C/Objective-C++ programs.
1389
1390 fobjc-nilcheck
1391 ObjC ObjC++ Var(flag_objc_nilcheck,1)
1392 Enable inline checks for nil receivers with the NeXT runtime and ABI version 2.
1393
1394 ; Nonzero means that we generate NeXT setjmp based exceptions.
1395 fobjc-sjlj-exceptions
1396 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
1397 Enable Objective-C setjmp exception handling runtime.
1398
1399 fobjc-std=objc1
1400 ObjC ObjC++ Var(flag_objc1_only)
1401 Conform to the Objective-C 1.0 language as implemented in GCC 4.0.
1402
1403 fopenacc
1404 C ObjC C++ ObjC++ LTO Var(flag_openacc)
1405 Enable OpenACC.
1406
1407 fopenacc-dim=
1408 C ObjC C++ ObjC++ LTO Joined Var(flag_openacc_dims)
1409 Specify default OpenACC compute dimensions.
1410
1411 fopenmp
1412 C ObjC C++ ObjC++ LTO Var(flag_openmp)
1413 Enable OpenMP (implies -frecursive in Fortran).
1414
1415 fopenmp-simd
1416 C ObjC C++ ObjC++ Var(flag_openmp_simd)
1417 Enable OpenMP's SIMD directives.
1418
1419 foperator-names
1420 C++ ObjC++
1421 Recognize C++ keywords like \"compl\" and \"xor\".
1422
1423 foptional-diags
1424 C++ ObjC++ Ignore
1425 Does nothing.  Preserved for backward compatibility.
1426
1427 fpch-deps
1428 C ObjC C++ ObjC++
1429
1430 fpch-preprocess
1431 C ObjC C++ ObjC++
1432 Look for and use PCH files even when preprocessing.
1433
1434 fpermissive
1435 C++ ObjC++ Var(flag_permissive)
1436 Downgrade conformance errors to warnings.
1437
1438 fplan9-extensions
1439 C ObjC Var(flag_plan9_extensions)
1440 Enable Plan 9 language extensions.
1441
1442 fpreprocessed
1443 C ObjC C++ ObjC++
1444 Treat the input file as already preprocessed.
1445
1446 ftrack-macro-expansion
1447 C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger
1448 ; converted into ftrack-macro-expansion=
1449
1450 ftrack-macro-expansion=
1451 C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger
1452 -ftrack-macro-expansion=<0|1|2>  Track locations of tokens coming from macro expansion and display them in error messages.
1453
1454 fpretty-templates
1455 C++ ObjC++ Var(flag_pretty_templates) Init(1)
1456 -fno-pretty-templates Do not pretty-print template specializations as the template signature followed by the arguments.
1457
1458 freplace-objc-classes
1459 ObjC ObjC++ LTO Var(flag_replace_objc_classes)
1460 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime.
1461
1462 frepo
1463 C++ ObjC++
1464 Enable automatic template instantiation.
1465
1466 frtti
1467 C++ ObjC++ Optimization Var(flag_rtti) Init(1)
1468 Generate run time type descriptor information.
1469
1470 fshort-enums
1471 C ObjC C++ ObjC++ LTO Optimization Var(flag_short_enums)
1472 Use the narrowest integer type possible for enumeration types.
1473
1474 fshort-wchar
1475 C ObjC C++ ObjC++ LTO Optimization Var(flag_short_wchar)
1476 Force the underlying type for \"wchar_t\" to be \"unsigned short\".
1477
1478 fsigned-bitfields
1479 C ObjC C++ ObjC++ Var(flag_signed_bitfields) Init(1)
1480 When \"signed\" or \"unsigned\" is not given make the bitfield signed.
1481
1482 fsigned-char
1483 C ObjC C++ ObjC++ LTO Var(flag_signed_char)
1484 Make \"char\" signed by default.
1485
1486 fsized-deallocation
1487 C++ ObjC++ Var(flag_sized_deallocation) Init(-1)
1488 Enable C++14 sized deallocation support.
1489
1490 fsquangle
1491 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1492
1493 fsso-struct=
1494 C ObjC Joined Enum(sso_struct) Var(default_sso) Init(SSO_NATIVE)
1495 -fsso-struct=[big-endian|little-endian] Set the default scalar storage order.
1496
1497 Enum
1498 Name(sso_struct) Type(enum scalar_storage_order_kind) UnknownError(unrecognized scalar storage order value %qs)
1499
1500 EnumValue
1501 Enum(sso_struct) String(big-endian) Value(SSO_BIG_ENDIAN)
1502
1503 EnumValue
1504 Enum(sso_struct) String(little-endian) Value(SSO_LITTLE_ENDIAN)
1505
1506 fstats
1507 C++ ObjC++ Var(flag_detailed_statistics)
1508 Display statistics accumulated during compilation.
1509
1510 fstrict-enums
1511 C++ ObjC++ Optimization Var(flag_strict_enums)
1512 Assume that values of enumeration type are always within the minimum range of that type.
1513
1514 fstrict-prototype
1515 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1516
1517 fstrong-eval-order
1518 C++ ObjC++ Common Alias(fstrong-eval-order=, all, none)
1519 Follow the C++17 evaluation order requirements for assignment expressions,
1520 shift, member function calls, etc.
1521
1522 fstrong-eval-order=
1523 C++ ObjC++ Common Var(flag_strong_eval_order) Joined Enum(strong_eval_order) Init(-1)
1524 Follow the C++17 evaluation order requirements for assignment expressions,
1525 shift, member function calls, etc.
1526
1527 Enum
1528 Name(strong_eval_order) Type(int)
1529
1530 EnumValue
1531 Enum(strong_eval_order) String(none) Value(0)
1532
1533 EnumValue
1534 Enum(strong_eval_order) String(some) Value(1)
1535
1536 EnumValue
1537 Enum(strong_eval_order) String(all) Value(2)
1538
1539 ftabstop=
1540 C ObjC C++ ObjC++ Joined RejectNegative UInteger
1541 -ftabstop=<number>      Distance between tab stops for column reporting.
1542
1543 ftemplate-backtrace-limit=
1544 C++ ObjC++ Joined RejectNegative UInteger Var(template_backtrace_limit) Init(10)
1545 Set the maximum number of template instantiation notes for a single warning or error.
1546
1547 ftemplate-depth-
1548 C++ ObjC++ Joined RejectNegative Undocumented Alias(ftemplate-depth=)
1549
1550 ftemplate-depth=
1551 C++ ObjC++ Joined RejectNegative UInteger
1552 -ftemplate-depth=<number>       Specify maximum template instantiation depth.
1553
1554 fthis-is-variable
1555 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1556
1557 fthreadsafe-statics
1558 C++ ObjC++ Optimization Var(flag_threadsafe_statics) Init(1)
1559 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics.
1560
1561 funsigned-bitfields
1562 C ObjC C++ ObjC++ Var(flag_signed_bitfields, 0)
1563 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned.
1564
1565 funsigned-char
1566 C ObjC C++ ObjC++ LTO Var(flag_signed_char, 0)
1567 Make \"char\" unsigned by default.
1568
1569 fuse-cxa-atexit
1570 C++ ObjC++ Var(flag_use_cxa_atexit) Init(DEFAULT_USE_CXA_ATEXIT)
1571 Use __cxa_atexit to register destructors.
1572
1573 fuse-cxa-get-exception-ptr
1574 C++ ObjC++ Var(flag_use_cxa_get_exception_ptr) Init(2)
1575 Use __cxa_get_exception_ptr in exception handling.
1576
1577 fvisibility-inlines-hidden
1578 C++ ObjC++
1579 Marks all inlined functions and methods as having hidden visibility.
1580
1581 fvisibility-ms-compat
1582 C++ ObjC++ Var(flag_visibility_ms_compat)
1583 Changes visibility to match Microsoft Visual Studio by default.
1584
1585 fvtable-gc
1586 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1587 No longer supported.
1588
1589 fvtable-thunks
1590 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1591 No longer supported.
1592
1593 fweak
1594 C++ ObjC++ Var(flag_weak) Init(1)
1595 Emit common-like symbols as weak symbols.
1596
1597 fwide-exec-charset=
1598 C ObjC C++ ObjC++ Joined RejectNegative
1599 -fwide-exec-charset=<cset>      Convert all wide strings and character constants to character set <cset>.
1600
1601 fworking-directory
1602 C ObjC C++ ObjC++ Var(flag_working_directory) Init(-1)
1603 Generate a #line directive pointing at the current working directory.
1604
1605 fxref
1606 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1607 No longer supported.
1608
1609 fzero-link
1610 ObjC ObjC++ Var(flag_zero_link)
1611 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode.
1612
1613 gen-decls
1614 ObjC ObjC++ Var(flag_gen_declaration)
1615 Dump declarations to a .decl file.
1616
1617 femit-struct-debug-baseonly
1618 C ObjC C++ ObjC++
1619 -femit-struct-debug-baseonly    Aggressive reduced debug info for structs.
1620
1621 femit-struct-debug-reduced
1622 C ObjC C++ ObjC++
1623 -femit-struct-debug-reduced     Conservative reduced debug info for structs.
1624
1625 femit-struct-debug-detailed=
1626 C ObjC C++ ObjC++ Joined
1627 -femit-struct-debug-detailed=<spec-list>        Detailed reduced debug info for structs.
1628
1629 fext-numeric-literals
1630 C++ ObjC++
1631 Interpret imaginary, fixed-point, or other gnu number suffix as the corresponding
1632 number literal rather than a user-defined number literal.
1633
1634 idirafter
1635 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1636 -idirafter <dir>        Add <dir> to the end of the system include path.
1637
1638 imacros
1639 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
1640 -imacros <file> Accept definition of macros in <file>.
1641
1642 imultilib
1643 C ObjC C++ ObjC++ Joined Separate
1644 -imultilib <dir>        Set <dir> to be the multilib include subdirectory.
1645
1646 include
1647 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
1648 -include <file> Include the contents of <file> before other files.
1649
1650 iprefix
1651 C ObjC C++ ObjC++ Joined Separate
1652 -iprefix <path> Specify <path> as a prefix for next two options.
1653
1654 isysroot
1655 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1656 -isysroot <dir> Set <dir> to be the system root directory.
1657
1658 isystem
1659 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1660 -isystem <dir>  Add <dir> to the start of the system include path.
1661
1662 iquote
1663 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1664 -iquote <dir>   Add <dir> to the end of the quote include path.
1665
1666 iwithprefix
1667 C ObjC C++ ObjC++ Joined Separate
1668 -iwithprefix <dir>      Add <dir> to the end of the system include path.
1669
1670 iwithprefixbefore
1671 C ObjC C++ ObjC++ Joined Separate
1672 -iwithprefixbefore <dir>        Add <dir> to the end of the main include path.
1673
1674 lang-asm
1675 C Undocumented RejectDriver
1676
1677 no-integrated-cpp
1678 Driver
1679
1680 nostdinc
1681 C ObjC C++ ObjC++
1682 Do not search standard system include directories (those specified with -isystem will still be used).
1683
1684 nostdinc++
1685 C++ ObjC++
1686 Do not search standard system include directories for C++.
1687
1688 o
1689 C ObjC C++ ObjC++ Joined Separate
1690 ; Documented in common.opt
1691
1692 pedantic
1693 C ObjC C++ ObjC++ Alias(Wpedantic)
1694 ; Documented in common.opt
1695
1696 print-objc-runtime-info
1697 ObjC ObjC++
1698 Generate C header of platform-specific features.
1699
1700 remap
1701 C ObjC C++ ObjC++
1702 Remap file names when including files.
1703
1704 std=c++98
1705 C++ ObjC++
1706 Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum.
1707
1708 std=c++03
1709 C++ ObjC++ Alias(std=c++98)
1710 Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum.
1711
1712 std=c++11
1713 C++ ObjC++
1714 Conform to the ISO 2011 C++ standard.
1715
1716 std=c++0x
1717 C++ ObjC++ Alias(std=c++11) Undocumented
1718 Deprecated in favor of -std=c++11.
1719
1720 std=c++1y
1721 C++ ObjC++ Alias(std=c++14) Undocumented
1722 Deprecated in favor of -std=c++14.
1723
1724 std=c++14
1725 C++ ObjC++
1726 Conform to the ISO 2014 C++ standard.
1727
1728 std=c++1z
1729 C++ ObjC++
1730 Conform to the ISO 2017(?) C++ draft standard (experimental and incomplete support).
1731
1732 std=c++17
1733 C++ ObjC++ Alias(std=c++1z) Undocumented
1734
1735 std=c11
1736 C ObjC
1737 Conform to the ISO 2011 C standard.
1738
1739 std=c1x
1740 C ObjC Alias(std=c11)
1741 Deprecated in favor of -std=c11.
1742
1743 std=c89
1744 C ObjC Alias(std=c90)
1745 Conform to the ISO 1990 C standard.
1746
1747 std=c90
1748 C ObjC
1749 Conform to the ISO 1990 C standard.
1750
1751 std=c99
1752 C ObjC
1753 Conform to the ISO 1999 C standard.
1754
1755 std=c9x
1756 C ObjC Alias(std=c99)
1757 Deprecated in favor of -std=c99.
1758
1759 std=gnu++98
1760 C++ ObjC++
1761 Conform to the ISO 1998 C++ standard revised by the 2003 technical
1762 corrigendum with GNU extensions.
1763
1764 std=gnu++03
1765 C++ ObjC++ Alias(std=gnu++98)
1766 Conform to the ISO 1998 C++ standard revised by the 2003 technical
1767 corrigendum with GNU extensions.
1768
1769 std=gnu++11
1770 C++ ObjC++
1771 Conform to the ISO 2011 C++ standard with GNU extensions.
1772
1773 std=gnu++0x
1774 C++ ObjC++ Alias(std=gnu++11) Undocumented
1775 Deprecated in favor of -std=gnu++11.
1776
1777 std=gnu++1y
1778 C++ ObjC++ Alias(std=gnu++14) Undocumented
1779 Deprecated in favor of -std=gnu++14.
1780
1781 std=gnu++14
1782 C++ ObjC++
1783 Conform to the ISO 2014 C++ standard with GNU extensions.
1784
1785 std=gnu++1z
1786 C++ ObjC++
1787 Conform to the ISO 201z(7?) C++ draft standard with GNU extensions (experimental and incomplete support).
1788
1789 std=gnu++17
1790 C++ ObjC++ Alias(std=gnu++1z) Undocumented
1791
1792 std=gnu11
1793 C ObjC
1794 Conform to the ISO 2011 C standard with GNU extensions.
1795
1796 std=gnu1x
1797 C ObjC Alias(std=gnu11)
1798 Deprecated in favor of -std=gnu11.
1799
1800 std=gnu89
1801 C ObjC Alias(std=gnu90)
1802 Conform to the ISO 1990 C standard with GNU extensions.
1803
1804 std=gnu90
1805 C ObjC
1806 Conform to the ISO 1990 C standard with GNU extensions.
1807
1808 std=gnu99
1809 C ObjC
1810 Conform to the ISO 1999 C standard with GNU extensions.
1811
1812 std=gnu9x
1813 C ObjC Alias(std=gnu99)
1814 Deprecated in favor of -std=gnu99.
1815
1816 std=iso9899:1990
1817 C ObjC Alias(std=c90)
1818 Conform to the ISO 1990 C standard.
1819
1820 std=iso9899:199409
1821 C ObjC
1822 Conform to the ISO 1990 C standard as amended in 1994.
1823
1824 std=iso9899:1999
1825 C ObjC Alias(std=c99)
1826 Conform to the ISO 1999 C standard.
1827
1828 std=iso9899:199x
1829 C ObjC Alias(std=c99)
1830 Deprecated in favor of -std=iso9899:1999.
1831
1832 std=iso9899:2011
1833 C ObjC Alias(std=c11)
1834 Conform to the ISO 2011 C standard.
1835
1836 traditional
1837 Driver
1838
1839 traditional-cpp
1840 C ObjC C++ ObjC++
1841 Enable traditional preprocessing.
1842
1843 trigraphs
1844 C ObjC C++ ObjC++
1845 -trigraphs      Support ISO C trigraphs.
1846
1847 undef
1848 C ObjC C++ ObjC++ Var(flag_undef)
1849 Do not predefine system-specific and GCC-specific macros.
1850
1851 v
1852 C ObjC C++ ObjC++
1853 ; Documented in common.opt
1854
1855 w
1856 C ObjC C++ ObjC++
1857 ; Documented in common.opt
1858
1859 ; This comment is to ensure we retain the blank line above.