gcc/c.opt

   1 ; Options for the C, ObjC, C++ and ObjC++ front ends.
   2 ; Copyright (C) 2003, 2004 Free Software Foundation, Inc.
   3 ;
   4 ; This file is part of GCC.
   5 ;
   6 ; GCC is free software; you can redistribute it and/or modify it under
   7 ; the terms of the GNU General Public License as published by the Free
   8 ; Software Foundation; either version 2, or (at your option) any later
   9 ; version.
  10 ;
  11 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 ; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 ; for more details.
  15 ;
  16 ; You should have received a copy of the GNU General Public License
  17 ; along with GCC; see the file COPYING.  If not, write to the Free
  18 ; Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  19 ; 02111-1307, USA.
  20
  21
  22 ; This file is processed by the script opts.sh.  It is a database of
  23 ; command line options, with each record separated by a blank line,
  24 ; and each field appearing on its own line.  The first field is the
  25 ; command-line switch with the leading "-" removed.  All options
  26 ; beginning with "f" or "W" are implicitly assumed to take a "no-"
  27 ; form; this form should not be listed.  If you do not want this
  28 ; negative form and you want it to be automatically rejected, add
  29 ; RejectNegative to the second field.
  30
  31 ; The second field is a space-separated list of which parts of the
  32 ; compiler recognize the switch, as declared by "Language" entries.
  33 ; If the switch takes an argument, then you should also specify
  34 ; "Joined" and/or "Separate" to indicate where the argument can
  35 ; appear.  If a Joined argument can legitimately be omitted, specify
  36 ; "JoinedOrMissing" instead of "Joined".  If the argument to a switch
  37 ; is a non-negative integer, you can specify "UInteger" and the switch
  38 ; decoder will convert the argument for you, or complain to the user
  39 ; if the argument is invalid.  "Var(name,set)" creates an integer
  40 ; variable "name".  The variable is declared and initialized to value
  41 ; given by "Init(value)" (or zero if this property is not defined).
  42 ; When the option is passed to compiler, this variable is set to "set"
  43 ; if value passed through the flag is nonzero, !"set" if value is zero,
  44 ; or to value if "set" is omitted.  If "VarExists"  is specified, the
  45 ; declaration for the variable is not created.  If "Report" is specified,
  46 ; the flag is output with -fverbose-asm.
  47
  48 ; The third field is the help text to output with --help.  This is
  49 ; automatically line-wrapped on output.  Normally the switch is output
  50 ; automatically, with the help text on the right hand side of the
  51 ; output.  However, if the help text contains a tab character, the
  52 ; text to the left of the tab is output instead of the switch, and the
  53 ; text to its right forms the help.  This is useful for elaborating on
  54 ; what type of argument a switch takes, for example.  If the second
  55 ; field contains "Undocumented" then nothing is output with --help.
  56 ; Only do this with good reason like the switch being internal between
  57 ; the driver and the front end - it is not an excuse to leave a switch
  58 ; undocumented.
  59
  60 ; Comments can appear on their own line anwhere in the file, preceded
  61 ; by a semicolon.  Whitespace is permitted before the semicolon.
  62
  63 ; For each switch XXX below, an enumeration constant is created by the
  64 ; script opts.sh spelt OPT_XXX, but with all non-alphanumeric
  65 ; characters replaced with an underscore.
  66
  67 ; Please try to keep this file in ASCII collating order.
  68
  69 Language
  70 C
  71
  72 Language
  73 ObjC
  74
  75 Language
  76 C++
  77
  78 Language
  79 ObjC++
  80
  81 -output-pch=
  82 C ObjC C++ ObjC++ Joined Separate
  83
  84 A
  85 C ObjC C++ ObjC++ Joined Separate
  86 -A<question>=<answer>   Assert the <answer> to <question>.  Putting '-' before <question> disables the <answer> to <question>
  87
  88 C
  89 C ObjC C++ ObjC++
  90 Do not discard comments
  91
  92 CC
  93 C ObjC C++ ObjC++
  94 Do not discard comments in macro expansions
  95
  96 D
  97 C ObjC C++ ObjC++ Joined Separate
  98 -D<macro>[=<val>]       Define a <macro> with <val> as its value.  If just <macro> is given, <val> is taken to be 1
  99
 100 E
 101 C ObjC C++ ObjC++ Undocumented
 102
 103 F
 104 C ObjC C++ ObjC++ Joined Separate
 105 -F <dir>        Add <dir> to the end of the main framework include path
 106
 107 H
 108 C ObjC C++ ObjC++
 109 Print the name of header files as they are used
 110
 111 I
 112 C ObjC C++ ObjC++ Joined Separate
 113 -I <dir>        Add <dir> to the end of the main include path
 114
 115 M
 116 C ObjC C++ ObjC++
 117 Generate make dependencies
 118
 119 MD
 120 C ObjC C++ ObjC++ Separate
 121 Generate make dependencies and compile
 122
 123 MF
 124 C ObjC C++ ObjC++ Joined Separate
 125 -MF <file>      Write dependency output to the given file
 126
 127 MG
 128 C ObjC C++ ObjC++
 129 Treat missing header files as generated files
 130
 131 MM
 132 C ObjC C++ ObjC++
 133 Like -M but ignore system header files
 134
 135 MMD
 136 C ObjC C++ ObjC++ Separate
 137 Like -MD but ignore system header files
 138
 139 MP
 140 C ObjC C++ ObjC++
 141 Generate phony targets for all headers
 142
 143 MQ
 144 C ObjC C++ ObjC++ Joined Separate
 145 -MQ <target>    Add a MAKE-quoted target
 146
 147 MT
 148 C ObjC C++ ObjC++ Joined Separate
 149 -MT <target>    Add an unquoted target
 150
 151 P
 152 C ObjC C++ ObjC++
 153 Do not generate #line directives
 154
 155 U
 156 C ObjC C++ ObjC++ Joined Separate
 157 -U<macro>       Undefine <macro>
 158
 159 Wabi
 160 C++ ObjC++
 161
 162 Wall
 163 C ObjC C++ ObjC++
 164 Enable most warning messages
 165
 166 Wbad-function-cast
 167 C ObjC
 168 Warn about casting functions to incompatible types
 169
 170 Wcast-qual
 171 C ObjC C++ ObjC++
 172 Warn about casts which discard qualifiers
 173
 174 Wchar-subscripts
 175 C ObjC C++ ObjC++
 176 Warn about subscripts whose type is \"char\"
 177
 178 Wcomment
 179 C ObjC C++ ObjC++
 180 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
 181
 182 Wcomments
 183 C ObjC C++ ObjC++
 184 Synonym for -Wcomment
 185
 186 Wconversion
 187 C ObjC C++ ObjC++
 188 Warn about possibly confusing type conversions
 189
 190 Wctor-dtor-privacy
 191 C++ ObjC++
 192 Warn when all constructors and destructors are private
 193
 194 Wdeclaration-after-statement
 195 C ObjC
 196 Warn when a declaration is found after a statement
 197
 198 Wdeprecated
 199 C++ ObjC++
 200 Warn about deprecated compiler features
 201
 202 Wdiv-by-zero
 203 C ObjC
 204 Warn about compile-time integer division by zero
 205
 206 Weffc++
 207 C++ ObjC++
 208 Warn about violations of Effective C++ style rules
 209
 210 Wendif-labels
 211 C ObjC C++ ObjC++
 212 Warn about stray tokens after #elif and #endif
 213
 214 Werror
 215 C ObjC C++ ObjC++
 216 ; Documented in common.opt
 217
 218 Werror-implicit-function-declaration
 219 C ObjC RejectNegative
 220 Make implicit function declarations an error
 221
 222 Wfloat-equal
 223 C ObjC C++ ObjC++
 224 Warn if testing floating point numbers for equality
 225
 226 Wformat
 227 C ObjC C++ ObjC++
 228 Warn about printf/scanf/strftime/strfmon format string anomalies
 229
 230 Wformat-extra-args
 231 C ObjC C++ ObjC++
 232 Warn if passing too many arguments to a function for its format string
 233
 234 Wformat-nonliteral
 235 C ObjC C++ ObjC++
 236 Warn about format strings that are not literals
 237
 238 Wformat-security
 239 C ObjC C++ ObjC++
 240 Warn about possible security problems with format functions
 241
 242 Wformat-y2k
 243 C ObjC C++ ObjC++
 244 Warn about strftime formats yielding 2-digit years
 245
 246 Wformat-zero-length
 247 C ObjC
 248
 249 Wformat=
 250 C ObjC C++ ObjC++ Joined
 251
 252 Winit-self
 253 C ObjC C++ ObjC++
 254 Warn about variables which are initialized to themselves.
 255
 256 Wimplicit
 257 C ObjC C++ ObjC++
 258
 259 Wimplicit-function-declaration
 260 C ObjC
 261 Warn about implicit function declarations
 262
 263 Wimplicit-int
 264 C ObjC
 265 Warn when a declaration does not specify a type
 266
 267 Wimport
 268 C ObjC C++ ObjC++
 269 Deprecated.  This switch has no effect.
 270
 271 Winvalid-offsetof
 272 C++ ObjC++
 273 Warn about invalid uses of the \"offsetof\" macro
 274
 275 Winvalid-pch
 276 C ObjC C++ ObjC++
 277 Warn about PCH files that are found but not used
 278
 279 Wlong-long
 280 C ObjC C++ ObjC++
 281 Do not warn about using \"long long\" when -pedantic
 282
 283 Wmain
 284 C ObjC
 285 Warn about suspicious declarations of \"main\"
 286
 287 Wmissing-braces
 288 C ObjC C++ ObjC++
 289 Warn about possibly missing braces around initializers
 290
 291 Wmissing-declarations
 292 C ObjC
 293 Warn about global functions without previous declarations
 294
 295 Wmissing-format-attribute
 296 C ObjC C++ ObjC++
 297 Warn about functions which might be candidates for format attributes
 298
 299 Wmissing-include-dirs
 300 C ObjC C++ ObjC++
 301 Warn about user-specified include directories that do not exist
 302
 303 Wmissing-prototypes
 304 C ObjC
 305 Warn about global functions without prototypes
 306
 307 Wmultichar
 308 C ObjC C++ ObjC++
 309 Warn about use of multi-character character constants
 310
 311 Wnested-externs
 312 C ObjC
 313 Warn about \"extern\" declarations not at file scope
 314
 315 Wnon-template-friend
 316 C++ ObjC++
 317 Warn when non-templatized friend functions are declared within a template
 318
 319 Wnon-virtual-dtor
 320 C++ ObjC++
 321 Warn about non-virtual destructors
 322
 323 Wnonnull
 324 C ObjC
 325
 326 Wold-style-cast
 327 C++ ObjC++
 328 Warn if a C-style cast is used in a program
 329
 330 Wold-style-definition
 331 C ObjC
 332 Warn if an old-style parameter definition is used
 333
 334 Woverloaded-virtual
 335 C++ ObjC++
 336 Warn about overloaded virtual function names
 337
 338 Wparentheses
 339 C ObjC C++ ObjC++
 340 Warn about possibly missing parentheses
 341
 342 Wpmf-conversions
 343 C++ ObjC++
 344 Warn when converting the type of pointers to member functions
 345
 346 Wpointer-arith
 347 C ObjC C++ ObjC++
 348 Warn about function pointer arithmetic
 349
 350 Wprotocol
 351 ObjC ObjC++
 352 Warn if inherited methods are unimplemented
 353
 354 Wredundant-decls
 355 C ObjC C++ ObjC++
 356 Warn about multiple declarations of the same object
 357
 358 Wreorder
 359 C++ ObjC++
 360 Warn when the compiler reorders code
 361
 362 Wreturn-type
 363 C ObjC C++ ObjC++
 364 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
 365
 366 Wselector
 367 ObjC ObjC++
 368 Warn if a selector has multiple methods
 369
 370 Wsequence-point
 371 C ObjC
 372 Warn about possible violations of sequence point rules
 373
 374 Wsign-compare
 375 C ObjC C++ ObjC++
 376 Warn about signed-unsigned comparisons
 377
 378 Wsign-promo
 379 C++ ObjC++
 380 Warn when overload promotes from unsigned to signed
 381
 382 Wstrict-prototypes
 383 C ObjC
 384 Warn about unprototyped function declarations
 385
 386 Wsynth
 387 C++ ObjC++
 388 Warn when synthesis behavior differs from Cfront
 389
 390 Wsystem-headers
 391 C ObjC C++ ObjC++
 392 Do not suppress warnings from system headers
 393
 394 Wtraditional
 395 C ObjC
 396 Warn about features not present in traditional C
 397
 398 Wtrigraphs
 399 C ObjC C++ ObjC++
 400 Warn if trigraphs are encountered that might affect the meaning of the program
 401
 402 Wundeclared-selector
 403 ObjC ObjC++
 404
 405 Wundef
 406 C ObjC C++ ObjC++
 407 Warn if an undefined macro is used in an #if directive
 408
 409 Wunknown-pragmas
 410 C ObjC C++ ObjC++
 411 Warn about unrecognized pragmas
 412
 413 Wunused-macros
 414 C ObjC C++ ObjC++
 415 Warn about macros defined in the main file that are not used
 416
 417 Wvariadic-macros
 418 C ObjC C++ ObjC++
 419 Do not warn about using variadic macros when -pedantic
 420
 421 Wwrite-strings
 422 C ObjC C++ ObjC++
 423 Give strings the type \"array of char\"
 424
 425 ansi
 426 C ObjC C++ ObjC++
 427 A synonym for -std=c89.  In a future version of GCC it will become synonymous with -std=c99 instead
 428
 429 d
 430 C ObjC C++ ObjC++ Joined
 431 ; Documented in common.opt.  FIXME - what about -dI, -dD, -dN and -dD?
 432
 433 faccess-control
 434 C++ ObjC++
 435 Enforce class member access control semantics
 436
 437 fall-virtual
 438 C++ ObjC++
 439
 440 falt-external-templates
 441 C++ ObjC++
 442 Change when template instances are emitted
 443
 444 fasm
 445 C ObjC C++ ObjC++
 446 Recognize the \"asm\" keyword
 447
 448 fbuiltin
 449 C ObjC C++ ObjC++
 450 Recognize built-in functions
 451
 452 fbuiltin-
 453 C ObjC C++ ObjC++ Joined
 454
 455 fcheck-new
 456 C++ ObjC++
 457 Check the return value of new
 458
 459 fcond-mismatch
 460 C ObjC C++ ObjC++
 461 Allow the arguments of the '?' operator to have different types
 462
 463 fconserve-space
 464 C++ ObjC++
 465 Reduce the size of object files
 466
 467 fconst-strings
 468 C++ ObjC++
 469 Make string literals \"const char[]\" not \"char[]\"
 470
 471 fconstant-string-class=
 472 ObjC ObjC++ Joined
 473 -fconst-string-class=<name>     Use class <name> for constant strings
 474
 475 fdefault-inline
 476 C++ ObjC++
 477 Inline member functions by default
 478
 479 fdollars-in-identifiers
 480 C ObjC C++ ObjC++
 481 Permit '$' as an identifier character
 482
 483 felide-constructors
 484 C++ ObjC++
 485
 486 fenforce-eh-specs
 487 C++ ObjC++
 488 Generate code to check exception specifications
 489
 490 fenum-int-equiv
 491 C++ ObjC++
 492
 493 fexec-charset=
 494 C ObjC C++ ObjC++ Joined RejectNegative
 495 -fexec-charset=<cset>   Convert all strings and character constants to character set <cset>
 496
 497 finput-charset=
 498 C ObjC C++ ObjC++ Joined RejectNegative
 499 -finput-charset=<cset>      Specify the default character set for source files.
 500
 501
 502 fexternal-templates
 503 C++ ObjC++
 504
 505 ffixed-form
 506 C ObjC
 507
 508 ffixed-line-length-
 509 C ObjC Joined
 510
 511 ffor-scope
 512 C++ ObjC++
 513 Scope of for-init-statement variables is local to the loop
 514
 515 ffreestanding
 516 C ObjC
 517 Do not assume that standard C libraries and \"main\" exist
 518
 519 fgnu-keywords
 520 C++ ObjC++
 521 Recognize GNU-defined keywords
 522
 523 fgnu-runtime
 524 ObjC ObjC++
 525 Generate code for GNU runtime environment
 526
 527 fguiding-decls
 528 C++ ObjC++
 529
 530 fhandle-exceptions
 531 C++ ObjC++
 532
 533 fhonor-std
 534 C++ ObjC++
 535
 536 fhosted
 537 C ObjC
 538 Assume normal C execution environment
 539
 540 fhuge-objects
 541 C++ ObjC++
 542 Enable support for huge objects
 543
 544 fimplement-inlines
 545 C++ ObjC++
 546 Export functions even if they can be inlined
 547
 548 fimplicit-inline-templates
 549 C++ ObjC++
 550 Emit implicit instantiations of inline templates
 551
 552 fimplicit-templates
 553 C++ ObjC++
 554 Emit implicit instantiations of templates
 555
 556 flabels-ok
 557 C++ ObjC++
 558
 559 fms-extensions
 560 C ObjC C++ ObjC++
 561 Don't warn about uses of Microsoft extensions
 562
 563 fname-mangling-version-
 564 C++ ObjC++ Joined
 565
 566 fnew-abi
 567 C++ ObjC++
 568
 569 fnext-runtime
 570 ObjC ObjC++
 571 Generate code for NeXT (Apple Mac OS X) runtime environment
 572
 573 fnil-receivers
 574 ObjC ObjC++
 575 Assume that receivers of Objective-C messages may be nil
 576
 577 fnonansi-builtins
 578 C++ ObjC++
 579
 580 fnonnull-objects
 581 C++ ObjC++
 582
 583 fobjc-exceptions
 584 ObjC ObjC++
 585 Enable Objective-C exception and synchronization syntax
 586
 587 foperator-names
 588 C++ ObjC++
 589 Recognize C++ kewords like \"compl\" and \"xor\"
 590
 591 foptional-diags
 592 C++ ObjC++
 593 Enable optional diagnostics
 594
 595 fpch-deps
 596 C ObjC C++ ObjC++
 597
 598 fpermissive
 599 C++ ObjC++
 600 Downgrade conformance errors to warnings
 601
 602 fpreprocessed
 603 C ObjC C++ ObjC++
 604 Treat the input file as already preprocessed
 605
 606 freplace-objc-classes
 607 ObjC ObjC++
 608 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
 609
 610 frepo
 611 C++ ObjC++
 612 Enable automatic template instantiation
 613
 614 frtti
 615 C++ ObjC++
 616 Generate run time type descriptor information
 617
 618 fshort-double
 619 C ObjC C++ ObjC++
 620 Use the same size for double as for float
 621
 622 fshort-enums
 623 C ObjC C++ ObjC++
 624 Use the narrowest integer type possible for enumeration types
 625
 626 fshort-wchar
 627 C ObjC C++ ObjC++
 628 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
 629
 630 fshow-column
 631 C ObjC C++ ObjC++
 632
 633 fsigned-bitfields
 634 C ObjC C++ ObjC++
 635 When \"signed\" or \"unsigned\" is not given make the bitfield signed
 636
 637 fsigned-char
 638 C ObjC C++ ObjC++
 639 Make \"char\" signed by default
 640
 641 fsquangle
 642 C++ ObjC++
 643
 644 fstats
 645 C++ ObjC++
 646 Display statistics accumulated during compilation
 647
 648 fstrict-prototype
 649 C++ ObjC++
 650
 651 ftabstop=
 652 C ObjC C++ ObjC++ Joined RejectNegative UInteger
 653 -ftabstop=<number>      Distance between tab stops for column reporting
 654
 655 ftemplate-depth-
 656 C++ ObjC++ Joined RejectNegative UInteger
 657 -ftemplate-depth-<number>       Specify maximum template instantiation depth
 658
 659 fthis-is-variable
 660 C++ ObjC++
 661
 662 funsigned-bitfields
 663 C ObjC C++ ObjC++
 664 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
 665
 666 funsigned-char
 667 C ObjC C++ ObjC++
 668 Make \"char\" unsigned by default
 669
 670 fuse-cxa-atexit
 671 C++ ObjC++
 672 Use __cxa_atexit to register destructors
 673
 674 fvtable-gc
 675 C++ ObjC++
 676 Discard unused virtual functions
 677
 678 fvtable-thunks
 679 C++ ObjC++
 680 Implement vtables using thunks
 681
 682 fweak
 683 C++ ObjC++
 684 Emit common-like symbols as weak symbols
 685
 686 fwide-exec-charset=
 687 C ObjC C++ ObjC++ Joined RejectNegative
 688 -fwide-exec-charset=<cset>      Convert all wide strings and character constants to character set <cset>
 689
 690 fworking-directory
 691 C ObjC C++ ObjC++
 692 Generate a #line directive pointing at the current working directory
 693
 694 fxref
 695 C++ ObjC++
 696 Emit cross referencing information
 697
 698 fzero-link
 699 ObjC ObjC++
 700 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
 701
 702 gen-decls
 703 ObjC ObjC++
 704 Dump declarations to a .decl file
 705
 706 idirafter
 707 C ObjC C++ ObjC++ Joined Separate
 708 -idirafter <dir>        Add <dir> to the end of the system include path
 709
 710 imacros
 711 C ObjC C++ ObjC++ Joined Separate
 712 -imacros <file> Accept definition of macros in <file>
 713
 714 include
 715 C ObjC C++ ObjC++ Joined Separate
 716 -include <file> Include the contents of <file> before other files
 717
 718 iprefix
 719 C ObjC C++ ObjC++ Joined Separate
 720 -iprefix <path> Specify <path> as a prefix for next two options
 721
 722 isysroot
 723 C ObjC C++ ObjC++ Joined Separate
 724 -isysroot <dir> Set <dir> to be the system root directory
 725
 726 isystem
 727 C ObjC C++ ObjC++ Joined Separate
 728 -isystem <dir>  Add <dir> to the start of the system include path
 729
 730 iquote
 731 C ObjC C++ ObjC++ Joined Separate
 732 -iquote <dir>   Add <dir> to the end of the quote include path
 733
 734 iwithprefix
 735 C ObjC C++ ObjC++ Joined Separate
 736 -iwithprefix <dir>      Add <dir> to the end of the system include path
 737
 738 iwithprefixbefore
 739 C ObjC C++ ObjC++ Joined Separate
 740 -iwithprefixbefore <dir>        Add <dir> to the end of the main include path
 741
 742 lang-asm
 743 C Undocumented
 744
 745 lang-objc
 746 C ObjC C++ ObjC++ Undocumented
 747
 748 nostdinc
 749 C ObjC C++ ObjC++
 750 Do not search standard system include directories (those specified with -isystem will still be used)
 751
 752 nostdinc++
 753 C++ ObjC++
 754 Do not search standard system include directories for C++
 755
 756 o
 757 C ObjC C++ ObjC++ Joined Separate
 758 ; Documented in common.opt
 759
 760 pedantic
 761 C ObjC C++ ObjC++
 762 ; Documented in common.opt
 763
 764 pedantic-errors
 765 C ObjC C++ ObjC++
 766 ; Documented in common.opt
 767
 768 print-objc-runtime-info
 769 ObjC ObjC++
 770 Generate C header of platform-specific features
 771
 772 remap
 773 C ObjC C++ ObjC++
 774 Remap file names when including files
 775
 776 std=c++98
 777 C++ ObjC++
 778 Conform to the ISO 1998 C++ standard
 779
 780 std=c89
 781 C ObjC
 782 Conform to the ISO 1990 C standard
 783
 784 std=c99
 785 C ObjC
 786 Conform to the ISO 1999 C standard
 787
 788 std=c9x
 789 C ObjC
 790 Deprecated in favor of -std=c99
 791
 792 std=gnu++98
 793 C++ ObjC++
 794 Conform to the ISO 1998 C++ standard with GNU extensions
 795
 796 std=gnu89
 797 C ObjC
 798 Conform to the ISO 1990 C standard with GNU extensions
 799
 800 std=gnu99
 801 C ObjC
 802 Conform to the ISO 1999 C standard with GNU extensions
 803
 804 std=gnu9x
 805 C ObjC
 806 Deprecated in favor of -std=gnu99
 807
 808 std=iso9899:1990
 809 C ObjC
 810 Deprecated in favor of -std=c89
 811
 812 std=iso9899:199409
 813 C ObjC
 814 Conform to the ISO 1990 C standard as amended in 1994
 815
 816 std=iso9899:1999
 817 C ObjC
 818 Deprecated in favor of -std=c99
 819
 820 std=iso9899:199x
 821 C ObjC
 822 Deprecated in favor of -std=c99
 823
 824 traditional-cpp
 825 C ObjC C++ ObjC++
 826 Enable traditional preprocessing
 827
 828 trigraphs
 829 C ObjC C++ ObjC++
 830 -trigraphs      Support ISO C trigraphs
 831
 832 undef
 833 C ObjC C++ ObjC++
 834 Do not predefine system-specific and GCC-specific macros
 835
 836 v
 837 C ObjC C++ ObjC++
 838 Enable verbose output
 839
 840 w
 841 C ObjC C++ ObjC++
 842 ; Documented in common.opt
 843
 844 ; This comment is to ensure we retain the blank line above.