gcc/common.opt

   1 ; Options for the language- and target-independent parts of the compiler.
   2
   3 ; Copyright (C) 2003-2014 Free Software Foundation, Inc.
   4 ;
   5 ; This file is part of GCC.
   6 ;
   7 ; GCC is free software; you can redistribute it and/or modify it under
   8 ; the terms of the GNU General Public License as published by the Free
   9 ; Software Foundation; either version 3, or (at your option) any later
  10 ; version.
  11 ;
  12 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 ; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 ; for more details.
  16 ;
  17 ; You should have received a copy of the GNU General Public License
  18 ; along with GCC; see the file COPYING3.  If not see
  19 ; <http://www.gnu.org/licenses/>.
  20
  21 ; See the GCC internals manual (options.texi) for a description of this file's format.
  22
  23 ; Please try to keep this file in ASCII collating order.
  24
  25 Variable
  26 int target_flags
  27
  28 Variable
  29 int optimize
  30
  31 Variable
  32 int optimize_size
  33
  34 Variable
  35 int optimize_debug
  36
  37 ; Not used directly to control optimizations, only to save -Ofast
  38 ; setting for "optimize" attributes.
  39 Variable
  40 int optimize_fast
  41
  42 ; True if this is the lto front end.  This is used to disable gimple
  43 ; generation and lowering passes that are normally run on the output
  44 ; of a front end.  These passes must be bypassed for lto since they
  45 ; have already been done before the gimple was written.
  46 Variable
  47 bool in_lto_p = false
  48
  49 ; 0 means straightforward implementation of complex divide acceptable.
  50 ; 1 means wide ranges of inputs must work for complex divide.
  51 ; 2 means C99-like requirements for complex multiply and divide.
  52 Variable
  53 int flag_complex_method = 1
  54
  55 ; Nonzero if subexpressions must be evaluated from left-to-right.
  56 Variable
  57 int flag_evaluation_order = 0
  58
  59 ; Language specific warning pass for unused results.
  60 Variable
  61 bool flag_warn_unused_result = false
  62
  63 Variable
  64 int *param_values
  65
  66 ; Nonzero if we should write GIMPLE bytecode for link-time optimization.
  67 Variable
  68 int flag_generate_lto
  69
  70 ; True to warn about any objects definitions whose size is larger
  71 ; than N bytes.  Also want about function definitions whose returned
  72 ; values are larger than N bytes, where N is 'larger_than_size'.
  73 Variable
  74 bool warn_larger_than
  75
  76 Variable
  77 HOST_WIDE_INT larger_than_size
  78
  79 ; True to warn about any function whose frame size is larger
  80 ; than N bytes.
  81 Variable
  82 bool warn_frame_larger_than
  83
  84 Variable
  85 HOST_WIDE_INT frame_larger_than_size
  86
  87 ; Nonzero means we should be saving declaration info into a .X file.
  88 Variable
  89 int flag_gen_aux_info = 0
  90
  91 ; Nonzero if we are compiling code for a shared library, zero for
  92 ; executable.
  93 Variable
  94 int flag_shlib
  95
  96 ; These two are really VEC(char_p,heap) *.
  97
  98 Variable
  99 void *flag_instrument_functions_exclude_functions
 100
 101 Variable
 102 void *flag_instrument_functions_exclude_files
 103
 104 ; Generic structs (e.g. templates not explicitly specialized)
 105 ; may not have a compilation unit associated with them, and so
 106 ; may need to be treated differently from ordinary structs.
 107 ;
 108 ; Structs only handled by reference (indirectly), will also usually
 109 ; not need as much debugging information.
 110
 111 Variable
 112 enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
 113
 114 Variable
 115 enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
 116
 117 ; True if we should exit after parsing options.
 118 Variable
 119 bool exit_after_options
 120
 121 ; Type(s) of debugging information we are producing (if any).  See
 122 ; flag-types.h for the definitions of the different possible types of
 123 ; debugging information.
 124 Variable
 125 enum debug_info_type write_symbols = NO_DEBUG
 126
 127 ; Level of debugging information we are producing.  See flag-types.h
 128 ; for the definitions of the different possible levels.
 129 Variable
 130 enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
 131
 132 ; Nonzero means use GNU-only extensions in the generated symbolic
 133 ; debugging information.  Currently, this only has an effect when
 134 ; write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG.
 135 Variable
 136 bool use_gnu_debug_info_extensions
 137
 138 ; Original value of maximum field alignment in bytes, specified via
 139 ; -fpack-struct=<value>.
 140 Variable
 141 unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
 142
 143 ; Type of stack check.
 144 Variable
 145 enum stack_check_type flag_stack_check = NO_STACK_CHECK
 146
 147 ; True if stack usage information needs to be computed.
 148 Variable
 149 bool flag_stack_usage_info = false
 150
 151 ; -dA causes debug commentary information to be produced in
 152 ; the generated assembly code (to make it more readable).  This option
 153 ; is generally only of use to those who actually need to read the
 154 ; generated assembly code (perhaps while debugging the compiler itself).
 155 ; Currently, this switch is only used by dwarf2out.c; however, it is intended
 156 ; to be a catchall for printing debug information in the assembler file.
 157 Variable
 158 int flag_debug_asm
 159
 160 ; -dP causes the rtl to be emitted as a comment in assembly.
 161 Variable
 162 int flag_dump_rtl_in_asm
 163
 164 ; Whether -da was passed (used only in handle_common_deferred_options).
 165 Variable
 166 bool flag_dump_all_passed
 167
 168 ; Other flags saying which kinds of debugging dump have been requested.
 169
 170 Variable
 171 int rtl_dump_and_exit
 172
 173 Variable
 174 int flag_print_asm_name
 175
 176 ; Name of top-level original source file (what was input to cpp).
 177 ; This comes from the #-command at the beginning of the actual input.
 178 ; If there isn't any there, then this is the cc1 input file name.
 179 Variable
 180 const char *main_input_filename
 181
 182 ; Pointer to base name in main_input_filename, with directories and a
 183 ; single final extension removed, and the length of this base
 184 ; name.
 185
 186 Variable
 187 const char *main_input_basename
 188
 189 Variable
 190 int main_input_baselength
 191
 192 ; Which options have been printed by --help.
 193 Variable
 194 char *help_printed
 195
 196 ; Which enums have been printed by --help.  0 = not printed, no
 197 ; relevant options seen, 1 = relevant option seen, not yet printed, 2
 198 ; = printed.
 199 Variable
 200 char *help_enum_printed
 201
 202 ; The number of columns for --help output.
 203 Variable
 204 unsigned int help_columns
 205
 206 ; Whether this options structure has been through finish_options
 207 Variable
 208 bool flag_opts_finished
 209
 210 ; What the sanitizer should instrument
 211 Variable
 212 unsigned int flag_sanitize
 213
 214 ; What sanitizers should recover from errors
 215 Variable
 216 unsigned int flag_sanitize_recover = SANITIZE_UNDEFINED | SANITIZE_NONDEFAULT
 217
 218 ; Flag whether a prefix has been added to dump_base_name
 219 Variable
 220 bool dump_base_name_prefixed = false
 221
 222 ###
 223 Driver
 224
 225 -assemble
 226 Driver Alias(S)
 227
 228 -compile
 229 Driver Alias(c)
 230
 231 -coverage
 232 Driver Alias(coverage)
 233
 234 -debug
 235 Common Alias(g)
 236
 237 -dump
 238 Common Separate Alias(d)
 239
 240 -dump=
 241 Common Joined Alias(d)
 242
 243 -dumpbase
 244 Common Separate Alias(dumpbase)
 245
 246 -dumpdir
 247 Common Separate Alias(dumpdir)
 248
 249 -entry
 250 Driver Separate Alias(e)
 251
 252 -entry=
 253 Driver Joined Alias(e)
 254
 255 -extra-warnings
 256 Common Warning Alias(Wextra)
 257
 258 -for-assembler
 259 Driver Separate Alias(Xassembler)
 260
 261 -for-assembler=
 262 Driver JoinedOrMissing Alias(Xassembler)
 263
 264 -for-linker
 265 Driver Separate Alias(Xlinker)
 266
 267 -for-linker=
 268 Driver JoinedOrMissing Alias(Xlinker)
 269
 270 -force-link
 271 Driver Separate Alias(u)
 272
 273 -force-link=
 274 Driver Joined Alias(u)
 275
 276 -help
 277 Common Driver Var(help_flag)
 278 Display this information
 279
 280 -help=
 281 Common Driver Report Joined
 282 --help=<class>  Display descriptions of a specific class of options.  <class> is one or more of optimizers, target, warnings, undocumented, params
 283
 284 -language
 285 Driver Separate Alias(x)
 286
 287 -language=
 288 Driver Joined Alias(x)
 289
 290 -library-directory
 291 Driver Separate Alias(L)
 292
 293 -library-directory=
 294 Driver Joined Alias(L)
 295
 296 -no-canonical-prefixes
 297 Driver Alias(no-canonical-prefixes)
 298
 299 -no-standard-libraries
 300 Driver Alias(nostdlib)
 301
 302 -no-sysroot-suffix
 303 Driver Var(no_sysroot_suffix)
 304
 305 -no-warnings
 306 Common Alias(w)
 307
 308 -optimize
 309 Common Alias(O)
 310
 311 -output
 312 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
 313
 314 -output=
 315 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
 316
 317 -pass-exit-codes
 318 Driver Alias(pass-exit-codes)
 319
 320 -pedantic
 321 Common Alias(Wpedantic)
 322
 323 -pedantic-errors
 324 Common Alias(pedantic-errors)
 325
 326 -pie
 327 Driver Alias(pie)
 328
 329 -pipe
 330 Driver Alias(pipe)
 331
 332 -prefix
 333 Driver Separate Alias(B)
 334
 335 -prefix=
 336 Driver JoinedOrMissing Alias(B)
 337
 338 -preprocess
 339 Driver Alias(E)
 340
 341 -print-file-name
 342 Driver Separate Alias(print-file-name=)
 343
 344 -print-file-name=
 345 Driver JoinedOrMissing Alias(print-file-name=)
 346
 347 -print-libgcc-file-name
 348 Driver Alias(print-libgcc-file-name)
 349
 350 -print-multi-directory
 351 Driver Alias(print-multi-directory)
 352
 353 -print-multi-lib
 354 Driver Alias(print-multi-lib)
 355
 356 -print-multi-os-directory
 357 Driver Alias(print-multi-os-directory)
 358
 359 -print-multiarch
 360 Driver Alias(print-multiarch)
 361
 362 -print-prog-name
 363 Driver Separate Alias(print-prog-name=)
 364
 365 -print-prog-name=
 366 Driver JoinedOrMissing Alias(print-prog-name=)
 367
 368 -print-search-dirs
 369 Driver Alias(print-search-dirs)
 370
 371 -print-sysroot
 372 Driver Alias(print-sysroot)
 373
 374 -print-sysroot-headers-suffix
 375 Driver Alias(print-sysroot-headers-suffix)
 376
 377 -profile
 378 Common Alias(p)
 379
 380 -save-temps
 381 Driver Alias(save-temps)
 382
 383 -shared
 384 Driver Alias(shared)
 385
 386 -specs
 387 Driver Separate Alias(specs=)
 388
 389 -specs=
 390 Driver Joined Alias(specs=)
 391
 392 -static
 393 Driver Alias(static)
 394
 395 -symbolic
 396 Driver Alias(symbolic)
 397
 398 -target-help
 399 Common Driver
 400 Alias for --help=target
 401
 402 -time
 403 Driver Alias(time)
 404
 405 -verbose
 406 Driver Alias(v)
 407
 408 ;; The driver used to convert options such as --help into forms such
 409 ;; as -fhelp; the following four entries are for compatibility with
 410 ;; any direct uses of those (undocumented) -f forms
 411 fhelp
 412 Common Driver Alias(-help)
 413
 414 fhelp=
 415 Common Driver Joined Alias(-help=)
 416
 417 ftarget-help
 418 Common Driver Alias(-target-help)
 419
 420 fversion
 421 Common Driver Alias(-version)
 422
 423 -param
 424 Common Separate
 425 --param <param>=<value> Set parameter <param> to value.  See below for a complete list of parameters
 426
 427 -param=
 428 Common Joined Alias(-param)
 429
 430 -sysroot
 431 Driver Separate Alias(-sysroot=)
 432
 433 -sysroot=
 434 Driver JoinedOrMissing
 435
 436 -version
 437 Common Driver
 438
 439 B
 440 Driver Joined Separate
 441
 442 E
 443 Driver
 444
 445 L
 446 Driver Joined Separate
 447
 448 N
 449 Driver
 450
 451 O
 452 Common JoinedOrMissing Optimization
 453 -O<number>      Set optimization level to <number>
 454
 455 Os
 456 Common Optimization
 457 Optimize for space rather than speed
 458
 459 Ofast
 460 Common Optimization
 461 Optimize for speed disregarding exact standards compliance
 462
 463 Og
 464 Common Optimization
 465 Optimize for debugging experience rather than speed or size
 466
 467 Q
 468 Driver
 469
 470 Qn
 471 Driver Negative(Qy)
 472
 473 Qy
 474 Driver Negative(Qn)
 475
 476 R
 477 Driver Joined Separate
 478
 479 S
 480 Driver
 481
 482 T
 483 Driver Joined Separate
 484
 485 Tbss
 486 Driver Separate
 487
 488 Tbss=
 489 Driver Joined
 490
 491 Tdata
 492 Driver Separate
 493
 494 Tdata=
 495 Driver Joined
 496
 497 Ttext
 498 Driver Separate
 499
 500 Ttext=
 501 Driver Joined
 502
 503 W
 504 Common RejectNegative Warning Alias(Wextra)
 505 This switch is deprecated; use -Wextra instead
 506
 507 Wa,
 508 Driver JoinedOrMissing
 509
 510 Wl,
 511 Driver JoinedOrMissing
 512
 513 Wp,
 514 Driver JoinedOrMissing
 515
 516 Waggregate-return
 517 Common Var(warn_aggregate_return) Warning
 518 Warn about returning structures, unions or arrays
 519
 520 Waggressive-loop-optimizations
 521 Common Var(warn_aggressive_loop_optimizations) Init(1) Warning
 522 Warn if a loop with constant number of iterations triggers undefined behavior
 523
 524 Warray-bounds
 525 Common Var(warn_array_bounds) Warning
 526 Warn if an array is accessed out of bounds
 527
 528 Wattributes
 529 Common Var(warn_attributes) Init(1) Warning
 530 Warn about inappropriate attribute usage
 531
 532 Wcast-align
 533 Common Var(warn_cast_align) Warning
 534 Warn about pointer casts which increase alignment
 535
 536 Wcpp
 537 Common Var(warn_cpp) Init(1) Warning
 538 Warn when a #warning directive is encountered
 539
 540 Wdeprecated-declarations
 541 Common Var(warn_deprecated_decl) Init(1) Warning
 542 Warn about uses of __attribute__((deprecated)) declarations
 543
 544 Wdisabled-optimization
 545 Common Var(warn_disabled_optimization) Warning
 546 Warn when an optimization pass is disabled
 547
 548 Werror
 549 Common Var(warnings_are_errors)
 550 Treat all warnings as errors
 551
 552 Werror=
 553 Common Joined
 554 Treat specified warning as error
 555
 556 Wextra
 557 Common Var(extra_warnings) Warning
 558 Print extra (possibly unwanted) warnings
 559
 560 Wfatal-errors
 561 Common Var(flag_fatal_errors)
 562 Exit on the first error occurred
 563
 564 Wframe-larger-than=
 565 Common RejectNegative Joined UInteger
 566 -Wframe-larger-than=<number>    Warn if a function's stack frame requires more than <number> bytes
 567
 568 Wfree-nonheap-object
 569 Common Var(warn_free_nonheap_object) Init(1) Warning
 570 Warn when attempting to free a non-heap object
 571
 572 Winline
 573 Common Var(warn_inline) Warning
 574 Warn when an inlined function cannot be inlined
 575
 576 Winvalid-memory-model
 577 Common Var(warn_invalid_memory_model) Init(1) Warning
 578 Warn when an atomic memory model parameter is known to be outside the valid range.
 579
 580 Wlarger-than-
 581 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
 582
 583 Wlarger-than=
 584 Common RejectNegative Joined UInteger Warning
 585 -Wlarger-than=<number>  Warn if an object is larger than <number> bytes
 586
 587 Wunsafe-loop-optimizations
 588 Common Var(warn_unsafe_loop_optimizations) Warning
 589 Warn if the loop cannot be optimized due to nontrivial assumptions.
 590
 591 Wmissing-noreturn
 592 Common Alias(Wsuggest-attribute=noreturn)
 593
 594 Wodr
 595 Common Var(warn_odr_violations) Init(1) Warning
 596 Warn about some C++ One Definition Rule violations during link time optimization
 597
 598 Woverflow
 599 Common Var(warn_overflow) Init(1) Warning
 600 Warn about overflow in arithmetic expressions
 601
 602 Wpacked
 603 Common Var(warn_packed) Warning
 604 Warn when the packed attribute has no effect on struct layout
 605
 606 Wpadded
 607 Common Var(warn_padded) Warning
 608 Warn when padding is required to align structure members
 609
 610 Wpedantic
 611 Common Var(pedantic) Init(0) Warning
 612 Issue warnings needed for strict compliance to the standard
 613
 614 Wreturn-local-addr
 615 Common Var(warn_return_local_addr) Init(1) Warning
 616 Warn about returning a pointer/reference to a local or temporary variable.
 617
 618 Wshadow
 619 Common Var(warn_shadow) Warning
 620 Warn when one local variable shadows another
 621
 622 Wstack-protector
 623 Common Var(warn_stack_protect) Warning
 624 Warn when not issuing stack smashing protection for some reason
 625
 626 Wstack-usage=
 627 Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
 628 Warn if stack usage might be larger than specified amount
 629
 630 Wstrict-aliasing
 631 Common Warning
 632 Warn about code which might break strict aliasing rules
 633
 634 Wstrict-aliasing=
 635 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
 636 Warn about code which might break strict aliasing rules
 637
 638 Wstrict-overflow
 639 Common Warning
 640 Warn about optimizations that assume that signed overflow is undefined
 641
 642 Wstrict-overflow=
 643 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
 644 Warn about optimizations that assume that signed overflow is undefined
 645
 646 Wsuggest-attribute=const
 647 Common Var(warn_suggest_attribute_const) Warning
 648 Warn about functions which might be candidates for __attribute__((const))
 649
 650 Wsuggest-attribute=pure
 651 Common Var(warn_suggest_attribute_pure) Warning
 652 Warn about functions which might be candidates for __attribute__((pure))
 653
 654 Wsuggest-attribute=noreturn
 655 Common Var(warn_suggest_attribute_noreturn) Warning
 656 Warn about functions which might be candidates for __attribute__((noreturn))
 657
 658 Wsuggest-final-types
 659 Common Var(warn_suggest_final_types) Warning
 660 Warn about C++ polymorphic types where adding final keyword would improve code quality
 661
 662 Wsuggest-final-methods
 663 Common Var(warn_suggest_final_methods) Warning
 664 Warn about C++ virtual methods where adding final keyword would improve code quality
 665
 666 Wsystem-headers
 667 Common Var(warn_system_headers) Warning
 668 Do not suppress warnings from system headers
 669
 670 Wtrampolines
 671 Common Var(warn_trampolines) Warning
 672 Warn whenever a trampoline is generated
 673
 674 Wtype-limits
 675 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
 676 Warn if a comparison is always true or always false due to the limited range of the data type
 677
 678 Wuninitialized
 679 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
 680 Warn about uninitialized automatic variables
 681
 682 Wmaybe-uninitialized
 683 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
 684 Warn about maybe uninitialized automatic variables
 685
 686 Wunreachable-code
 687 Common Ignore
 688 Does nothing. Preserved for backward compatibility.
 689
 690 Wunused
 691 Common Var(warn_unused) Init(0) Warning
 692 Enable all -Wunused- warnings
 693
 694 Wunused-but-set-parameter
 695 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
 696 Warn when a function parameter is only set, otherwise unused
 697
 698 Wunused-but-set-variable
 699 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
 700 Warn when a variable is only set, otherwise unused
 701
 702 Wunused-function
 703 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
 704 Warn when a function is unused
 705
 706 Wunused-label
 707 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
 708 Warn when a label is unused
 709
 710 Wunused-parameter
 711 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
 712 Warn when a function parameter is unused
 713
 714 Wunused-value
 715 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
 716 Warn when an expression value is unused
 717
 718 Wunused-variable
 719 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
 720 Warn when a variable is unused
 721
 722 Wcoverage-mismatch
 723 Common Var(warn_coverage_mismatch) Init(1) Warning
 724 Warn in case profiles in -fprofile-use do not match
 725
 726 Wvector-operation-performance
 727 Common Var(warn_vector_operation_performance) Warning
 728 Warn when a vector operation is compiled outside the SIMD
 729
 730 Xassembler
 731 Driver Separate
 732
 733 Xlinker
 734 Driver Separate
 735
 736 Xpreprocessor
 737 Driver Separate
 738
 739 Z
 740 Driver
 741
 742 aux-info
 743 Common Separate Var(aux_info_file_name)
 744 -aux-info <file>        Emit declaration information into <file>
 745
 746 aux-info=
 747 Common Joined Alias(aux-info)
 748
 749 auxbase
 750 Common Separate RejectDriver Var(aux_base_name)
 751
 752 auxbase-strip
 753 Common Separate RejectDriver
 754
 755 coverage
 756 Driver
 757
 758 c
 759 Driver
 760
 761 d
 762 Common Joined
 763 -d<letters>     Enable dumps from specific passes of the compiler
 764
 765 dumpbase
 766 Common Separate Var(dump_base_name)
 767 -dumpbase <file>        Set the file basename to be used for dumps
 768
 769 dumpdir
 770 Common Separate Var(dump_dir_name)
 771 -dumpdir <dir>  Set the directory name to be used for dumps
 772
 773 dumpmachine
 774 Driver
 775
 776 dumpspecs
 777 Driver
 778
 779 dumpversion
 780 Driver
 781
 782 e
 783 Driver Joined Separate
 784
 785 ; This option has historically been passed down to the linker by an
 786 ; accident of a %{e*} spec, so ensure it continues to be passed down
 787 ; as a single option.  The supported option for this purpose is
 788 ; -rdynamic.  See PR 47390.
 789 export-dynamic
 790 Driver Undocumented
 791
 792 ; The version of the C++ ABI in use.  The following values are allowed:
 793 ;
 794 ; 0: The version of the ABI believed most conformant with the C++ ABI
 795 ;    specification.  This ABI may change as bugs are discovered and fixed.
 796 ;    Therefore, 0 will not necessarily indicate the same ABI in different
 797 ;    versions of G++.
 798 ;
 799 ; 1: The version of the ABI first used in G++ 3.2.  No longer selectable.
 800 ;
 801 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
 802 ;
 803 ; 3: The version of the ABI that fixes the missing underscore
 804 ;    in template non-type arguments of pointer type.
 805 ;
 806 ; 4: The version of the ABI that introduces unambiguous mangling of
 807 ;    vector types.  First selectable in G++ 4.5.
 808 ;
 809 ; 5: The version of the ABI that ignores attribute const/noreturn
 810 ;    in function pointer mangling, and corrects mangling of decltype and
 811 ;    function parameters used in other parameters and the return type.
 812 ;    First selectable in G++ 4.6.
 813 ;
 814 ; 6: The version of the ABI that doesn't promote scoped enums to int and
 815 ;    changes the mangling of template argument packs, const/static_cast,
 816 ;    prefix ++ and --, and a class scope function used as a template
 817 ;    argument.
 818 ;    First selectable in G++ 4.7.
 819 ;
 820 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
 821 ;    corrects the mangling of lambdas in default argument scope.
 822 ;    First selectable in G++ 4.8.
 823 ;
 824 ; 8: The version of the ABI that corrects the substitution behavior of
 825 ;    function types with function-cv-qualifiers.
 826 ;    First selectable in G++ 4.9.
 827 ;
 828 ; Additional positive integers will be assigned as new versions of
 829 ; the ABI become the default version of the ABI.
 830 fabi-version=
 831 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(0)
 832 The version of the C++ ABI in use
 833
 834 faggressive-loop-optimizations
 835 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
 836 Aggressively optimize loops using language constraints
 837
 838 falign-functions
 839 Common Report Var(align_functions,0) Optimization UInteger
 840 Align the start of functions
 841
 842 falign-functions=
 843 Common RejectNegative Joined UInteger Var(align_functions)
 844
 845 falign-jumps
 846 Common Report Var(align_jumps,0) Optimization UInteger
 847 Align labels which are only reached by jumping
 848
 849 falign-jumps=
 850 Common RejectNegative Joined UInteger Var(align_jumps)
 851
 852 falign-labels
 853 Common Report Var(align_labels,0) Optimization UInteger
 854 Align all labels
 855
 856 falign-labels=
 857 Common RejectNegative Joined UInteger Var(align_labels)
 858
 859 falign-loops
 860 Common Report Var(align_loops,0) Optimization UInteger
 861 Align the start of loops
 862
 863 falign-loops=
 864 Common RejectNegative Joined UInteger Var(align_loops)
 865
 866 fargument-alias
 867 Common Ignore
 868 Does nothing. Preserved for backward compatibility.
 869
 870 fargument-noalias
 871 Common Ignore
 872 Does nothing. Preserved for backward compatibility.
 873
 874 fargument-noalias-global
 875 Common Ignore
 876 Does nothing. Preserved for backward compatibility.
 877
 878 fargument-noalias-anything
 879 Common Ignore
 880 Does nothing. Preserved for backward compatibility.
 881
 882 fsanitize=
 883 Common Driver Report Joined
 884 Select what to sanitize
 885
 886 fsanitize-recover=
 887 Common Report Joined
 888 After diagnosing undefined behavior attempt to continue execution
 889
 890 fsanitize-recover
 891 Common Report
 892 This switch is deprecated; use -fsanitize-recover= instead
 893
 894 fsanitize-undefined-trap-on-error
 895 Common Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
 896 Use trap instead of a library function for undefined behavior sanitization
 897
 898 fasynchronous-unwind-tables
 899 Common Report Var(flag_asynchronous_unwind_tables) Optimization
 900 Generate unwind tables that are exact at each instruction boundary
 901
 902 fauto-inc-dec
 903 Common Report Var(flag_auto_inc_dec) Init(1)
 904 Generate auto-inc/dec instructions
 905
 906 fauto-profile
 907 Common Report Var(flag_auto_profile) Optimization
 908 Use sample profile information for call graph node weights. The default
 909 profile file is fbdata.afdo in 'pwd'.
 910
 911 fauto-profile=
 912 Common Joined RejectNegative Var(auto_profile_file)
 913 Use sample profile information for call graph node weights. The profile
 914 file is specified in the argument.
 915
 916 ; -fcheck-bounds causes gcc to generate array bounds checks.
 917 ; For C, C++ and ObjC: defaults off.
 918 ; For Java: defaults to on.
 919 ; For Fortran: defaults to off.
 920 fbounds-check
 921 Common Report Var(flag_bounds_check)
 922 Generate code to check bounds before indexing arrays
 923
 924 fbranch-count-reg
 925 Common Report Var(flag_branch_on_count_reg) Optimization
 926 Replace add, compare, branch with branch on count register
 927
 928 fbranch-probabilities
 929 Common Report Var(flag_branch_probabilities) Optimization
 930 Use profiling information for branch probabilities
 931
 932 fbranch-target-load-optimize
 933 Common Report Var(flag_branch_target_load_optimize) Optimization
 934 Perform branch target load optimization before prologue / epilogue threading
 935
 936 fbranch-target-load-optimize2
 937 Common Report Var(flag_branch_target_load_optimize2) Optimization
 938 Perform branch target load optimization after prologue / epilogue threading
 939
 940 fbtr-bb-exclusive
 941 Common Report Var(flag_btr_bb_exclusive) Optimization
 942 Restrict target load migration not to re-use registers in any basic block
 943
 944 fcall-saved-
 945 Common Joined RejectNegative Var(common_deferred_options) Defer
 946 -fcall-saved-<register> Mark <register> as being preserved across functions
 947
 948 fcall-used-
 949 Common Joined RejectNegative Var(common_deferred_options) Defer
 950 -fcall-used-<register>  Mark <register> as being corrupted by function calls
 951
 952 ; Nonzero for -fcaller-saves: allocate values in regs that need to
 953 ; be saved across function calls, if that produces overall better code.
 954 ; Optional now, so people can test it.
 955 fcaller-saves
 956 Common Report Var(flag_caller_saves) Optimization
 957 Save registers around function calls
 958
 959 fcheck-data-deps
 960 Common Report Var(flag_check_data_deps)
 961 Compare the results of several data dependence analyzers.
 962
 963 fcheck-new
 964 Common Var(flag_check_new)
 965 Check the return value of new in C++
 966
 967 fcombine-stack-adjustments
 968 Common Report Var(flag_combine_stack_adjustments) Optimization
 969 Looks for opportunities to reduce stack adjustments and stack references.
 970
 971 fcommon
 972 Common Report Var(flag_no_common,0) Optimization
 973 Do not put uninitialized globals in the common section
 974
 975 fcompare-debug
 976 Driver
 977 ; Converted by the driver to -fcompare-debug= options.
 978
 979 fcompare-debug=
 980 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
 981 -fcompare-debug[=<opts>]        Compile with and without e.g. -gtoggle, and compare the final-insns dump
 982
 983 fcompare-debug-second
 984 Common Driver RejectNegative Var(flag_compare_debug)
 985 Run only the second compilation of -fcompare-debug
 986
 987 fcompare-elim
 988 Common Report Var(flag_compare_elim_after_reload) Optimization
 989 Perform comparison elimination after register allocation has finished
 990
 991 fconserve-stack
 992 Common Var(flag_conserve_stack) Optimization
 993 Do not perform optimizations increasing noticeably stack usage
 994
 995 fcprop-registers
 996 Common Report Var(flag_cprop_registers) Optimization
 997 Perform a register copy-propagation optimization pass
 998
 999 fcrossjumping
1000 Common Report Var(flag_crossjumping) Optimization
1001 Perform cross-jumping optimization
1002
1003 fcse-follow-jumps
1004 Common Report Var(flag_cse_follow_jumps) Optimization
1005 When running CSE, follow jumps to their targets
1006
1007 fcse-skip-blocks
1008 Common Ignore
1009 Does nothing.  Preserved for backward compatibility.
1010
1011 fcx-limited-range
1012 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
1013 Omit range reduction step when performing complex division
1014
1015 fcx-fortran-rules
1016 Common Report Var(flag_cx_fortran_rules) Optimization
1017 Complex multiplication and division follow Fortran rules
1018
1019 fdata-sections
1020 Common Report Var(flag_data_sections) Optimization
1021 Place data items into their own section
1022
1023 fdbg-cnt-list
1024 Common Report Var(common_deferred_options) Defer
1025 List all available debugging counters with their limits and counts.
1026
1027 fdbg-cnt=
1028 Common RejectNegative Joined Var(common_deferred_options) Defer
1029 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...]     Set the debug counter limit.
1030
1031 fdebug-prefix-map=
1032 Common Joined RejectNegative Var(common_deferred_options) Defer
1033 Map one directory name to another in debug information
1034
1035 fdebug-types-section
1036 Common Report Var(flag_debug_types_section) Init(0)
1037 Output .debug_types section when using DWARF v4 debuginfo.
1038
1039 ; Nonzero for -fdefer-pop: don't pop args after each function call
1040 ; instead save them up to pop many calls' args with one insns.
1041 fdefer-pop
1042 Common Report Var(flag_defer_pop) Optimization
1043 Defer popping functions args from stack until later
1044
1045 fdelayed-branch
1046 Common Report Var(flag_delayed_branch) Optimization
1047 Attempt to fill delay slots of branch instructions
1048
1049 fdelete-dead-exceptions
1050 Common Report Var(flag_delete_dead_exceptions) Init(0)
1051 Delete dead instructions that may throw exceptions
1052
1053 fdelete-null-pointer-checks
1054 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
1055 Delete useless null pointer checks
1056
1057 fdevirtualize-speculatively
1058 Common Report Var(flag_devirtualize_speculatively) Optimization
1059 Perform speculative devirtualization
1060
1061 fdevirtualize
1062 Common Report Var(flag_devirtualize) Optimization
1063 Try to convert virtual calls to direct ones.
1064
1065 fdiagnostics-show-location=
1066 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1067 -fdiagnostics-show-location=[once|every-line]   How often to emit source location at the beginning of line-wrapped diagnostics
1068
1069 ; Required for these enum values.
1070 SourceInclude
1071 pretty-print.h
1072
1073 Enum
1074 Name(diagnostic_prefixing_rule) Type(int)
1075
1076 EnumValue
1077 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1078
1079 EnumValue
1080 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1081
1082 fdiagnostics-show-caret
1083 Common Var(flag_diagnostics_show_caret) Init(1)
1084 Show the source line with a caret indicating the column
1085
1086 fdiagnostics-color
1087 Common Alias(fdiagnostics-color=,always,never)
1088 ;
1089
1090 fdiagnostics-color=
1091 Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1092 -fdiagnostics-color=[never|always|auto] Colorize diagnostics
1093
1094 ; Required for these enum values.
1095 SourceInclude
1096 diagnostic-color.h
1097
1098 Enum
1099 Name(diagnostic_color_rule) Type(int)
1100
1101 EnumValue
1102 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1103
1104 EnumValue
1105 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1106
1107 EnumValue
1108 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1109
1110 fdiagnostics-show-option
1111 Common Var(flag_diagnostics_show_option) Init(1)
1112 Amend appropriate diagnostic messages with the command line option that controls them
1113
1114 fdisable-
1115 Common Joined RejectNegative Var(common_deferred_options) Defer
1116 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1117
1118 fenable-
1119 Common Joined RejectNegative Var(common_deferred_options) Defer
1120 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1121
1122 fdump-
1123 Common Joined RejectNegative Var(common_deferred_options) Defer
1124 -fdump-<type>   Dump various compiler internals to a file
1125
1126 fdump-final-insns
1127 Driver RejectNegative
1128
1129 fdump-final-insns=
1130 Common RejectNegative Joined Var(flag_dump_final_insns)
1131 -fdump-final-insns=filename     Dump to filename the insns at the end of translation
1132
1133 fdump-go-spec=
1134 Common RejectNegative Joined Var(flag_dump_go_spec)
1135 -fdump-go-spec=filename Write all declarations to file as Go code
1136
1137 fdump-noaddr
1138 Common Report Var(flag_dump_noaddr)
1139 Suppress output of addresses in debugging dumps
1140
1141 freport-bug
1142 Common Driver Var(flag_report_bug)
1143 Collect and dump debug information into temporary file if ICE in C/C++
1144 compiler occured.
1145
1146 fdump-passes
1147 Common Var(flag_dump_passes) Init(0)
1148 Dump optimization passes
1149
1150 fdump-unnumbered
1151 Common Report Var(flag_dump_unnumbered)
1152 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1153
1154 fdump-unnumbered-links
1155 Common Report Var(flag_dump_unnumbered_links)
1156 Suppress output of previous and next insn numbers in debugging dumps
1157
1158 fdwarf2-cfi-asm
1159 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1160 Enable CFI tables via GAS assembler directives.
1161
1162 fearly-inlining
1163 Common Report Var(flag_early_inlining) Init(1) Optimization
1164 Perform early inlining
1165
1166 feliminate-dwarf2-dups
1167 Common Report Var(flag_eliminate_dwarf2_dups)
1168 Perform DWARF2 duplicate elimination
1169
1170 fipa-sra
1171 Common Report Var(flag_ipa_sra) Init(0) Optimization
1172 Perform interprocedural reduction of aggregates
1173
1174 feliminate-unused-debug-symbols
1175 Common Report Var(flag_debug_only_used_symbols)
1176 Perform unused type elimination in debug info
1177
1178 feliminate-unused-debug-types
1179 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1180 Perform unused type elimination in debug info
1181
1182 femit-class-debug-always
1183 Common Report Var(flag_emit_class_debug_always) Init(0)
1184 Do not suppress C++ class debug information.
1185
1186 fexceptions
1187 Common Report Var(flag_exceptions) Optimization
1188 Enable exception handling
1189
1190 fexpensive-optimizations
1191 Common Report Var(flag_expensive_optimizations) Optimization
1192 Perform a number of minor, expensive optimizations
1193
1194 fexcess-precision=
1195 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1196 -fexcess-precision=[fast|standard]      Specify handling of excess floating-point precision
1197
1198 Enum
1199 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1200
1201 EnumValue
1202 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1203
1204 EnumValue
1205 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1206
1207 ffast-math
1208 Common
1209
1210 ffat-lto-objects
1211 Common Var(flag_fat_lto_objects)
1212 Output lto objects containing both the intermediate language and binary output.
1213
1214 ffinite-math-only
1215 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1216 Assume no NaNs or infinities are generated
1217
1218 ffixed-
1219 Common Joined RejectNegative Var(common_deferred_options) Defer
1220 -ffixed-<register>      Mark <register> as being unavailable to the compiler
1221
1222 ffloat-store
1223 Common Report Var(flag_float_store) Optimization
1224 Don't allocate floats and doubles in extended-precision registers
1225
1226 fforce-addr
1227 Common Ignore
1228 Does nothing.  Preserved for backward compatibility.
1229
1230 fforward-propagate
1231 Common Report Var(flag_forward_propagate) Optimization
1232 Perform a forward propagation pass on RTL
1233
1234 ffp-contract=
1235 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1236 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1237
1238 Enum
1239 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1240
1241 EnumValue
1242 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1243
1244 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1245 EnumValue
1246 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1247
1248 EnumValue
1249 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1250
1251 ; Nonzero means don't put addresses of constant functions in registers.
1252 ; Used for compiling the Unix kernel, where strange substitutions are
1253 ; done on the assembly output.
1254 ffunction-cse
1255 Common Report Var(flag_no_function_cse,0)
1256 Allow function addresses to be held in registers
1257
1258 ffunction-sections
1259 Common Report Var(flag_function_sections)
1260 Place each function into its own section
1261
1262 fgcse
1263 Common Report Var(flag_gcse) Optimization
1264 Perform global common subexpression elimination
1265
1266 fgcse-lm
1267 Common Report Var(flag_gcse_lm) Init(1) Optimization
1268 Perform enhanced load motion during global common subexpression elimination
1269
1270 fgcse-sm
1271 Common Report Var(flag_gcse_sm) Init(0) Optimization
1272 Perform store motion after global common subexpression elimination
1273
1274 fgcse-las
1275 Common Report Var(flag_gcse_las) Init(0) Optimization
1276 Perform redundant load after store elimination in global common subexpression
1277 elimination
1278
1279 fgcse-after-reload
1280 Common Report Var(flag_gcse_after_reload) Optimization
1281 Perform global common subexpression elimination after register allocation
1282 has finished
1283
1284 ; This option is not documented yet as its semantics will change.
1285 fgraphite
1286 Common Report Var(flag_graphite)
1287 Enable in and out of Graphite representation
1288
1289 fgraphite-identity
1290 Common Report Var(flag_graphite_identity) Optimization
1291 Enable Graphite Identity transformation
1292
1293 fgraphite-code-generator=
1294 Common Report RejectNegative Joined Optimization Enum(fgraphite_generator) Var(flag_graphite_code_gen) Init(FGRAPHITE_CODE_GEN_ISL)
1295 Choose code generator of Graphite
1296
1297 Enum
1298 Name(fgraphite_generator) Type(enum fgraphite_generator) UnknownError(unknown code generator of graphite %qs)
1299
1300 EnumValue
1301 Enum(fgraphite_generator) String(isl) Value(FGRAPHITE_CODE_GEN_ISL)
1302
1303 EnumValue
1304 Enum(fgraphite_generator) String(cloog) Value(FGRAPHITE_CODE_GEN_CLOOG)
1305
1306 fhoist-adjacent-loads
1307 Common Report Var(flag_hoist_adjacent_loads) Optimization
1308 Enable hoisting adjacent loads to encourage generating conditional move
1309 instructions
1310
1311 floop-parallelize-all
1312 Common Report Var(flag_loop_parallelize_all) Optimization
1313 Mark all loops as parallel
1314
1315 floop-strip-mine
1316 Common Report Var(flag_loop_strip_mine) Optimization
1317 Enable Loop Strip Mining transformation
1318
1319 floop-interchange
1320 Common Report Var(flag_loop_interchange) Optimization
1321 Enable Loop Interchange transformation
1322
1323 floop-block
1324 Common Report Var(flag_loop_block) Optimization
1325 Enable Loop Blocking transformation
1326
1327 fgnu-tm
1328 Common Report Var(flag_tm)
1329 Enable support for GNU transactional memory
1330
1331 fgnu-unique
1332 Common Report Var(flag_gnu_unique) Init(1)
1333 Use STB_GNU_UNIQUE if supported by the assembler
1334
1335 floop-flatten
1336 Common Ignore
1337 Does nothing. Preserved for backward compatibility.
1338
1339 floop-nest-optimize
1340 Common Report Var(flag_loop_optimize_isl) Optimization
1341 Enable the ISL based loop nest optimizer
1342
1343 fstrict-volatile-bitfields
1344 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1345 Force bitfield accesses to match their type width
1346
1347 fguess-branch-probability
1348 Common Report Var(flag_guess_branch_prob) Optimization
1349 Enable guessing of branch probabilities
1350
1351 ; Nonzero means ignore `#ident' directives.  0 means handle them.
1352 ; Generate position-independent code for executables if possible
1353 ; On SVR4 targets, it also controls whether or not to emit a
1354 ; string identifying the compiler.
1355 fident
1356 Common Report Var(flag_no_ident,0)
1357 Process #ident directives
1358
1359 fif-conversion
1360 Common Report Var(flag_if_conversion) Optimization
1361 Perform conversion of conditional jumps to branchless equivalents
1362
1363 fif-conversion2
1364 Common Report Var(flag_if_conversion2) Optimization
1365 Perform conversion of conditional jumps to conditional execution
1366
1367 fstack-reuse=
1368 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1369 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1370
1371 Enum
1372 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1373
1374 EnumValue
1375 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1376
1377 EnumValue
1378 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1379
1380 EnumValue
1381 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1382
1383 ftree-loop-if-convert
1384 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1385 Convert conditional jumps in innermost loops to branchless equivalents
1386
1387 ftree-loop-if-convert-stores
1388 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1389 Also if-convert conditional jumps containing memory writes
1390
1391 ; -finhibit-size-directive inhibits output of .size for ELF.
1392 ; This is used only for compiling crtstuff.c,
1393 ; and it may be extended to other effects
1394 ; needed for crtstuff.c on other systems.
1395 finhibit-size-directive
1396 Common Report Var(flag_inhibit_size_directive)
1397 Do not generate .size directives
1398
1399 findirect-inlining
1400 Common Report Var(flag_indirect_inlining)
1401 Perform indirect inlining
1402
1403 ; General flag to enable inlining.  Specifying -fno-inline will disable
1404 ; all inlining apart from always-inline functions.
1405 finline
1406 Common Report Var(flag_no_inline,0) Init(0) Optimization
1407 Enable inlining of function declared \"inline\", disabling disables all inlining
1408
1409 finline-small-functions
1410 Common Report Var(flag_inline_small_functions) Optimization
1411 Integrate functions into their callers when code size is known not to grow
1412
1413 finline-functions
1414 Common Report Var(flag_inline_functions) Optimization
1415 Integrate functions not declared \"inline\" into their callers when profitable
1416
1417 finline-functions-called-once
1418 Common Report Var(flag_inline_functions_called_once) Optimization
1419 Integrate functions only required by their single caller
1420
1421 finline-limit-
1422 Common RejectNegative Joined Alias(finline-limit=)
1423
1424 finline-limit=
1425 Common RejectNegative Joined UInteger
1426 -finline-limit=<number> Limit the size of inlined functions to <number>
1427
1428 finline-atomics
1429 Common Report Var(flag_inline_atomics) Init(1) Optimization
1430 Inline __atomic operations when a lock free instruction sequence is available.
1431
1432 finstrument-functions
1433 Common Report Var(flag_instrument_function_entry_exit)
1434 Instrument function entry and exit with profiling calls
1435
1436 finstrument-functions-exclude-function-list=
1437 Common RejectNegative Joined
1438 -finstrument-functions-exclude-function-list=name,...  Do not instrument listed functions
1439
1440 finstrument-functions-exclude-file-list=
1441 Common RejectNegative Joined
1442 -finstrument-functions-exclude-file-list=filename,...  Do not instrument functions listed in files
1443
1444 fipa-cp
1445 Common Report Var(flag_ipa_cp) Optimization
1446 Perform interprocedural constant propagation
1447
1448 fipa-cp-clone
1449 Common Report Var(flag_ipa_cp_clone) Optimization
1450 Perform cloning to make Interprocedural constant propagation stronger
1451
1452 fipa-profile
1453 Common Report Var(flag_ipa_profile) Init(0) Optimization
1454 Perform interprocedural profile propagation
1455
1456 fipa-pta
1457 Common Report Var(flag_ipa_pta) Init(0) Optimization
1458 Perform interprocedural points-to analysis
1459
1460 fipa-pure-const
1461 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1462 Discover pure and const functions
1463
1464 fipa-icf
1465 Common Report Var(flag_ipa_icf) Optimization
1466 Perform Identical Code Folding for functions and read-only variables
1467
1468 fipa-icf-functions
1469 Common Report Var(flag_ipa_icf_functions) Optimization
1470 Perform Identical Code Folding for functions
1471
1472 fipa-icf-variables
1473 Common Report Var(flag_ipa_icf_variables) Optimization
1474 Perform Identical Code Folding for variables
1475
1476 fipa-reference
1477 Common Report Var(flag_ipa_reference) Init(0) Optimization
1478 Discover readonly and non addressable static variables
1479
1480 fipa-matrix-reorg
1481 Common Ignore
1482 Does nothing. Preserved for backward compatibility.
1483
1484 fipa-struct-reorg
1485 Common Ignore
1486 Does nothing. Preserved for backward compatibility.
1487
1488 fira-algorithm=
1489 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1490 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1491
1492 Enum
1493 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1494
1495 EnumValue
1496 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1497
1498 EnumValue
1499 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1500
1501 fira-region=
1502 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1503 -fira-region=[one|all|mixed] Set regions for IRA
1504
1505 Enum
1506 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1507
1508 EnumValue
1509 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1510
1511 EnumValue
1512 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1513
1514 EnumValue
1515 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1516
1517 fira-hoist-pressure
1518 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1519 Use IRA based register pressure calculation
1520 in RTL hoist optimizations.
1521
1522 fira-loop-pressure
1523 Common Report Var(flag_ira_loop_pressure) Optimization
1524 Use IRA based register pressure calculation
1525 in RTL loop optimizations.
1526
1527 fira-share-save-slots
1528 Common Report Var(flag_ira_share_save_slots) Init(1)
1529 Share slots for saving different hard registers.
1530
1531 fira-share-spill-slots
1532 Common Report Var(flag_ira_share_spill_slots) Init(1)
1533 Share stack slots for spilled pseudo-registers.
1534
1535 fira-verbose=
1536 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1537 -fira-verbose=<number>  Control IRA's level of diagnostic messages.
1538
1539 fivopts
1540 Common Report Var(flag_ivopts) Init(1) Optimization
1541 Optimize induction variables on trees
1542
1543 fjump-tables
1544 Common Var(flag_jump_tables) Init(1) Optimization
1545 Use jump tables for sufficiently large switch statements
1546
1547 fkeep-inline-functions
1548 Common Report Var(flag_keep_inline_functions)
1549 Generate code for functions even if they are fully inlined
1550
1551 fkeep-static-consts
1552 Common Report Var(flag_keep_static_consts) Init(1)
1553 Emit static const variables even if they are not used
1554
1555 fleading-underscore
1556 Common Report Var(flag_leading_underscore) Init(-1)
1557 Give external symbols a leading underscore
1558
1559 floop-optimize
1560 Common Ignore
1561 Does nothing.  Preserved for backward compatibility.
1562
1563 flto
1564 Common
1565 Enable link-time optimization.
1566
1567 flto=
1568 Common RejectNegative Joined Var(flag_lto)
1569 Link-time optimization with number of parallel jobs or jobserver.
1570
1571 Enum
1572 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1573
1574 EnumValue
1575 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1576
1577 EnumValue
1578 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1579
1580 EnumValue
1581 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1582
1583 EnumValue
1584 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1585
1586 EnumValue
1587 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1588
1589 flto-partition=
1590 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1591 Specify the algorithm to partition symbols and vars at linktime
1592
1593 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1594 flto-compression-level=
1595 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1596 -flto-compression-level=<number>        Use zlib compression level <number> for IL
1597
1598 flto-odr-type-merging
1599 Common Report Var(flag_lto_odr_type_mering) Init(1)
1600 Merge C++ types using One Definition Rule
1601
1602 flto-report
1603 Common Report Var(flag_lto_report) Init(0)
1604 Report various link-time optimization statistics
1605
1606 flto-report-wpa
1607 Common Report Var(flag_lto_report_wpa) Init(0)
1608 Report various link-time optimization statistics for WPA only
1609
1610 fmath-errno
1611 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1612 Set errno after built-in math functions
1613
1614 fmax-errors=
1615 Common Joined RejectNegative UInteger Var(flag_max_errors)
1616 -fmax-errors=<number>   Maximum number of errors to report
1617
1618 fmem-report
1619 Common Report Var(mem_report)
1620 Report on permanent memory allocation
1621
1622 fmem-report-wpa
1623 Common Report Var(mem_report_wpa)
1624 Report on permanent memory allocation in WPA only
1625
1626 ; This will attempt to merge constant section constants, if 1 only
1627 ; string constants and constants from constant pool, if 2 also constant
1628 ; variables.
1629 fmerge-all-constants
1630 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1631 Attempt to merge identical constants and constant variables
1632
1633 fmerge-constants
1634 Common Report Var(flag_merge_constants,1) Optimization
1635 Attempt to merge identical constants across compilation units
1636
1637 fmerge-debug-strings
1638 Common Report Var(flag_merge_debug_strings) Init(1)
1639 Attempt to merge identical debug strings across compilation units
1640
1641 fmessage-length=
1642 Common RejectNegative Joined UInteger
1643 -fmessage-length=<number>       Limit diagnostics to <number> characters per line.  0 suppresses line-wrapping
1644
1645 fmodulo-sched
1646 Common Report Var(flag_modulo_sched) Optimization
1647 Perform SMS based modulo scheduling before the first scheduling pass
1648
1649 fmodulo-sched-allow-regmoves
1650 Common Report Var(flag_modulo_sched_allow_regmoves)
1651 Perform SMS based modulo scheduling with register moves allowed
1652
1653 fmove-loop-invariants
1654 Common Report Var(flag_move_loop_invariants) Optimization
1655 Move loop invariant computations out of loops
1656
1657 fdce
1658 Common Var(flag_dce) Init(1) Optimization
1659 Use the RTL dead code elimination pass
1660
1661 fdse
1662 Common Var(flag_dse) Init(1) Optimization
1663 Use the RTL dead store elimination pass
1664
1665 freschedule-modulo-scheduled-loops
1666 Common Report Var(flag_resched_modulo_sched) Optimization
1667 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1668
1669 fnon-call-exceptions
1670 Common Report Var(flag_non_call_exceptions) Optimization
1671 Support synchronous non-call exceptions
1672
1673 fomit-frame-pointer
1674 Common Report Var(flag_omit_frame_pointer) Optimization
1675 When possible do not generate stack frames
1676
1677 fopt-info
1678 Common Report Var(flag_opt_info) Optimization
1679 Enable all optimization info dumps on stderr
1680
1681 fopt-info-
1682 Common Joined RejectNegative Var(common_deferred_options) Defer
1683 -fopt-info[-<type>=filename]    Dump compiler optimization details
1684
1685 foptimize-register-move
1686 Common Ignore
1687 Does nothing. Preserved for backward compatibility.
1688
1689 foptimize-sibling-calls
1690 Common Report Var(flag_optimize_sibling_calls) Optimization
1691 Optimize sibling and tail recursive calls
1692
1693 fpartial-inlining
1694 Common Report Var(flag_partial_inlining)
1695 Perform partial inlining
1696
1697 fpre-ipa-mem-report
1698 Common Report Var(pre_ipa_mem_report)
1699 Report on memory allocation before interprocedural optimization
1700
1701 fpost-ipa-mem-report
1702 Common Report Var(post_ipa_mem_report)
1703 Report on memory allocation before interprocedural optimization
1704
1705 fpack-struct
1706 Common Report Var(flag_pack_struct) Optimization
1707 Pack structure members together without holes
1708
1709 fpack-struct=
1710 Common RejectNegative Joined UInteger Optimization
1711 -fpack-struct=<number>  Set initial maximum structure member alignment
1712
1713 fpcc-struct-return
1714 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1715 Return small aggregates in memory, not registers
1716
1717 fpeel-loops
1718 Common Report Var(flag_peel_loops) Optimization
1719 Perform loop peeling
1720
1721 fpeephole
1722 Common Report Var(flag_no_peephole,0) Optimization
1723 Enable machine specific peephole optimizations
1724
1725 fpeephole2
1726 Common Report Var(flag_peephole2) Optimization
1727 Enable an RTL peephole pass before sched2
1728
1729 fPIC
1730 Common Report Var(flag_pic,2) Negative(fPIE)
1731 Generate position-independent code if possible (large mode)
1732
1733 fPIE
1734 Common Report Var(flag_pie,2) Negative(fpic)
1735 Generate position-independent code for executables if possible (large mode)
1736
1737 fpic
1738 Common Report Var(flag_pic,1) Negative(fpie)
1739 Generate position-independent code if possible (small mode)
1740
1741 fpie
1742 Common Report Var(flag_pie,1) Negative(fPIC)
1743 Generate position-independent code for executables if possible (small mode)
1744
1745 fplugin=
1746 Common Joined RejectNegative Var(common_deferred_options) Defer
1747 Specify a plugin to load
1748
1749 fplugin-arg-
1750 Common Joined RejectNegative Var(common_deferred_options) Defer
1751 -fplugin-arg-<name>-<key>[=<value>]     Specify argument <key>=<value> for plugin <name>
1752
1753 fpredictive-commoning
1754 Common Report Var(flag_predictive_commoning) Optimization
1755 Run predictive commoning optimization.
1756
1757 fprefetch-loop-arrays
1758 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1759 Generate prefetch instructions, if available, for arrays in loops
1760
1761 fprofile
1762 Common Report Var(profile_flag)
1763 Enable basic program profiling code
1764
1765 fprofile-arcs
1766 Common Report Var(profile_arc_flag)
1767 Insert arc-based program profiling code
1768
1769 fprofile-dir=
1770 Common Joined RejectNegative Var(profile_data_prefix)
1771 Set the top-level directory for storing the profile data.
1772 The default is 'pwd'.
1773
1774 fprofile-correction
1775 Common Report Var(flag_profile_correction)
1776 Enable correction of flow inconsistent profile data input
1777
1778 fprofile-generate
1779 Common
1780 Enable common options for generating profile info for profile feedback directed optimizations
1781
1782 fprofile-generate=
1783 Common Joined RejectNegative
1784 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1785
1786 fprofile-use
1787 Common Var(flag_profile_use)
1788 Enable common options for performing profile feedback directed optimizations
1789
1790 fprofile-use=
1791 Common Joined RejectNegative
1792 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1793
1794 fprofile-values
1795 Common Report Var(flag_profile_values)
1796 Insert code to profile values of expressions
1797
1798 fprofile-report
1799 Common Report Var(profile_report)
1800 Report on consistency of profile
1801
1802 fprofile-reorder-functions
1803 Common Report Var(flag_profile_reorder_functions)
1804 Enable function reordering that improves code placement
1805
1806 frandom-seed
1807 Common Var(common_deferred_options) Defer
1808
1809 frandom-seed=
1810 Common Joined RejectNegative Var(common_deferred_options) Defer
1811 -frandom-seed=<string>  Make compile reproducible using <string>
1812
1813 ; This switch causes the command line that was used to create an
1814 ; object file to be recorded into the object file.  The exact format
1815 ; of this recording is target and binary file format dependent.
1816 ; It is related to the -fverbose-asm switch, but that switch only
1817 ; records information in the assembler output file as comments, so
1818 ; they never reach the object file.
1819 frecord-gcc-switches
1820 Common Report Var(flag_record_gcc_switches)
1821 Record gcc command line switches in the object file.
1822
1823 freg-struct-return
1824 Common Report Var(flag_pcc_struct_return,0) Optimization
1825 Return small aggregates in registers
1826
1827 fregmove
1828 Common Ignore
1829 Does nothing. Preserved for backward compatibility.
1830
1831 flive-range-shrinkage
1832 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
1833 Relief of register pressure through live range shrinkage
1834
1835 frename-registers
1836 Common Report Var(flag_rename_registers) Init(2) Optimization
1837 Perform a register renaming optimization pass
1838
1839 freorder-blocks
1840 Common Report Var(flag_reorder_blocks) Optimization
1841 Reorder basic blocks to improve code placement
1842
1843 freorder-blocks-and-partition
1844 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1845 Reorder basic blocks and partition into hot and cold sections
1846
1847 freorder-functions
1848 Common Report Var(flag_reorder_functions) Optimization
1849 Reorder functions to improve code placement
1850
1851 frerun-cse-after-loop
1852 Common Report Var(flag_rerun_cse_after_loop) Optimization
1853 Add a common subexpression elimination pass after loop optimizations
1854
1855 frerun-loop-opt
1856 Common Ignore
1857 Does nothing.  Preserved for backward compatibility.
1858
1859 frounding-math
1860 Common Report Var(flag_rounding_math) Optimization SetByCombined
1861 Disable optimizations that assume default FP rounding behavior
1862
1863 fsched-interblock
1864 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1865 Enable scheduling across basic blocks
1866
1867 fsched-pressure
1868 Common Report Var(flag_sched_pressure) Init(0) Optimization
1869 Enable register pressure sensitive insn scheduling
1870
1871 fsched-spec
1872 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1873 Allow speculative motion of non-loads
1874
1875 fsched-spec-load
1876 Common Report Var(flag_schedule_speculative_load) Optimization
1877 Allow speculative motion of some loads
1878
1879 fsched-spec-load-dangerous
1880 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1881 Allow speculative motion of more loads
1882
1883 fsched-verbose=
1884 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1885 -fsched-verbose=<number>        Set the verbosity level of the scheduler
1886
1887 fsched2-use-superblocks
1888 Common Report Var(flag_sched2_use_superblocks) Optimization
1889 If scheduling post reload, do superblock scheduling
1890
1891 fsched2-use-traces
1892 Common Ignore
1893 Does nothing.  Preserved for backward compatibility.
1894
1895 fschedule-insns
1896 Common Report Var(flag_schedule_insns) Optimization
1897 Reschedule instructions before register allocation
1898
1899 fschedule-insns2
1900 Common Report Var(flag_schedule_insns_after_reload) Optimization
1901 Reschedule instructions after register allocation
1902
1903 ; This flag should be on when a target implements non-trivial
1904 ; scheduling hooks, maybe saving some information for its own sake.
1905 ; On IA64, for example, this is used for correct bundling.
1906 fselective-scheduling
1907 Common Report Var(flag_selective_scheduling) Optimization
1908 Schedule instructions using selective scheduling algorithm
1909
1910 fselective-scheduling2
1911 Common Report Var(flag_selective_scheduling2) Optimization
1912 Run selective scheduling after reload
1913
1914 fsel-sched-pipelining
1915 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1916 Perform software pipelining of inner loops during selective scheduling
1917
1918 fsel-sched-pipelining-outer-loops
1919 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1920 Perform software pipelining of outer loops during selective scheduling
1921
1922 fsel-sched-reschedule-pipelined
1923 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1924 Reschedule pipelined regions without pipelining
1925
1926 fsemantic-interposition
1927 Common Report Var(flag_semantic_interposition) Init(1)
1928 Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker
1929
1930 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1931 ; of stalled insns into the ready list.
1932 fsched-stalled-insns
1933 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1934 Allow premature scheduling of queued insns
1935
1936 fsched-stalled-insns=
1937 Common RejectNegative Joined UInteger
1938 -fsched-stalled-insns=<number>  Set number of queued insns that can be prematurely scheduled
1939
1940 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1941 ; be examined for a dependency on a stalled insn that is candidate for
1942 ; premature removal from the queue of stalled insns into the ready list (has
1943 ; an effect only if the flag 'sched_stalled_insns' is set).
1944 fsched-stalled-insns-dep
1945 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1946 Set dependence distance checking in premature scheduling of queued insns
1947
1948 fsched-stalled-insns-dep=
1949 Common RejectNegative Joined UInteger
1950 -fsched-stalled-insns-dep=<number>      Set dependence distance checking in premature scheduling of queued insns
1951
1952 fsched-group-heuristic
1953 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1954 Enable the group heuristic in the scheduler
1955
1956 fsched-critical-path-heuristic
1957 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1958 Enable the critical path heuristic in the scheduler
1959
1960 fsched-spec-insn-heuristic
1961 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1962 Enable the speculative instruction heuristic in the scheduler
1963
1964 fsched-rank-heuristic
1965 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1966 Enable the rank heuristic in the scheduler
1967
1968 fsched-last-insn-heuristic
1969 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1970 Enable the last instruction heuristic in the scheduler
1971
1972 fsched-dep-count-heuristic
1973 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1974 Enable the dependent count heuristic in the scheduler
1975
1976 fsection-anchors
1977 Common Report Var(flag_section_anchors) Optimization
1978 Access data in the same section from shared anchor points
1979
1980 fsee
1981 Common Ignore
1982 Does nothing.  Preserved for backward compatibility.
1983
1984 fzee
1985 Common Ignore
1986 Does nothing.  Preserved for backward compatibility.
1987
1988 free
1989 Common Report Var(flag_ree) Init(0)
1990 Turn on Redundant Extensions Elimination pass.
1991
1992 fshow-column
1993 Common Report Var(flag_show_column) Init(1)
1994 Show column numbers in diagnostics, when available.  Default on
1995
1996 fshrink-wrap
1997 Common Report Var(flag_shrink_wrap) Optimization
1998 Emit function prologues only before parts of the function that need it,
1999 rather than at the top of the function.
2000
2001 fsignaling-nans
2002 Common Report Var(flag_signaling_nans) Optimization SetByCombined
2003 Disable optimizations observable by IEEE signaling NaNs
2004
2005 fsigned-zeros
2006 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
2007 Disable floating point optimizations that ignore the IEEE signedness of zero
2008
2009 fsingle-precision-constant
2010 Common Report Var(flag_single_precision_constant) Optimization
2011 Convert floating point constants to single precision constants
2012
2013 fsplit-ivs-in-unroller
2014 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
2015 Split lifetimes of induction variables when loops are unrolled
2016
2017 fsplit-stack
2018 Common Report Var(flag_split_stack) Init(-1)
2019 Generate discontiguous stack frames
2020
2021 fsplit-wide-types
2022 Common Report Var(flag_split_wide_types) Optimization
2023 Split wide types into independent registers
2024
2025 fssa-phiopt
2026 Common Report Var(flag_ssa_phiopt) Optimization
2027 Optimize conditional patterns using SSA PHI nodes
2028
2029 fvariable-expansion-in-unroller
2030 Common Report Var(flag_variable_expansion_in_unroller) Optimization
2031 Apply variable expansion when loops are unrolled
2032
2033 fstack-check=
2034 Common Report RejectNegative Joined
2035 -fstack-check=[no|generic|specific]     Insert stack checking code into the program
2036
2037 fstack-check
2038 Common Alias(fstack-check=, specific, no)
2039 Insert stack checking code into the program.  Same as -fstack-check=specific
2040
2041 fstack-limit
2042 Common Var(common_deferred_options) Defer
2043
2044 fstack-limit-register=
2045 Common RejectNegative Joined Var(common_deferred_options) Defer
2046 -fstack-limit-register=<register>       Trap if the stack goes past <register>
2047
2048 fstack-limit-symbol=
2049 Common RejectNegative Joined Var(common_deferred_options) Defer
2050 -fstack-limit-symbol=<name>     Trap if the stack goes past symbol <name>
2051
2052 fstack-protector
2053 Common Report Var(flag_stack_protect, 1)
2054 Use propolice as a stack protection method
2055
2056 fstack-protector-all
2057 Common Report RejectNegative Var(flag_stack_protect, 2)
2058 Use a stack protection method for every function
2059
2060 fstack-protector-strong
2061 Common Report RejectNegative Var(flag_stack_protect, 3)
2062 Use a smart stack protection method for certain functions
2063
2064 fstack-usage
2065 Common RejectNegative Var(flag_stack_usage)
2066 Output stack usage information on a per-function basis
2067
2068 fstrength-reduce
2069 Common Ignore
2070 Does nothing.  Preserved for backward compatibility.
2071
2072 ; Nonzero if we should do (language-dependent) alias analysis.
2073 ; Typically, this analysis will assume that expressions of certain
2074 ; types do not alias expressions of certain other types.  Only used
2075 ; if alias analysis (in general) is enabled.
2076 fstrict-aliasing
2077 Common Report Var(flag_strict_aliasing) Optimization
2078 Assume strict aliasing rules apply
2079
2080 fstrict-overflow
2081 Common Report Var(flag_strict_overflow)
2082 Treat signed overflow as undefined
2083
2084 fsync-libcalls
2085 Common Report Var(flag_sync_libcalls) Init(1)
2086 Implement __atomic operations via libcalls to legacy __sync functions
2087
2088 fsyntax-only
2089 Common Report Var(flag_syntax_only)
2090 Check for syntax errors, then stop
2091
2092 ftest-coverage
2093 Common Report Var(flag_test_coverage)
2094 Create data files needed by \"gcov\"
2095
2096 fthread-jumps
2097 Common Report Var(flag_thread_jumps) Optimization
2098 Perform jump threading optimizations
2099
2100 ftime-report
2101 Common Report Var(time_report)
2102 Report the time taken by each compiler pass
2103
2104 ftls-model=
2105 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2106 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec]      Set the default thread-local storage code generation model
2107
2108 Enum
2109 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2110
2111 EnumValue
2112 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2113
2114 EnumValue
2115 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2116
2117 EnumValue
2118 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2119
2120 EnumValue
2121 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2122
2123 ftoplevel-reorder
2124 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
2125 Reorder top level functions, variables, and asms
2126
2127 ftracer
2128 Common Report Var(flag_tracer)
2129 Perform superblock formation via tail duplication
2130
2131 ; Zero means that floating-point math operations cannot generate a
2132 ; (user-visible) trap.  This is the case, for example, in nonstop
2133 ; IEEE 754 arithmetic.
2134 ftrapping-math
2135 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2136 Assume floating-point operations can trap
2137
2138 ftrapv
2139 Common Report Var(flag_trapv) Optimization
2140 Trap for signed overflow in addition, subtraction and multiplication
2141
2142 ftree-ccp
2143 Common Report Var(flag_tree_ccp) Optimization
2144 Enable SSA-CCP optimization on trees
2145
2146 ftree-bit-ccp
2147 Common Report Var(flag_tree_bit_ccp) Optimization
2148 Enable SSA-BIT-CCP optimization on trees
2149
2150 ftree-store-ccp
2151 Common Ignore
2152 Does nothing.  Preserved for backward compatibility.
2153
2154 ftree-ch
2155 Common Report Var(flag_tree_ch) Optimization
2156 Enable loop header copying on trees
2157
2158 ftree-coalesce-inlined-vars
2159 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2160 Enable coalescing of copy-related user variables that are inlined
2161
2162 ftree-coalesce-vars
2163 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2164 Enable coalescing of all copy-related user variables
2165
2166 ftree-copyrename
2167 Common Report Var(flag_tree_copyrename) Optimization
2168 Replace SSA temporaries with better names in copies
2169
2170 ftree-copy-prop
2171 Common Report Var(flag_tree_copy_prop) Optimization
2172 Enable copy propagation on trees
2173
2174 ftree-store-copy-prop
2175 Common Ignore
2176 Does nothing.  Preserved for backward compatibility.
2177
2178 ftree-cselim
2179 Common Report Var(flag_tree_cselim) Init(2) Optimization
2180 Transform condition stores into unconditional ones
2181
2182 ftree-switch-conversion
2183 Common Report Var(flag_tree_switch_conversion) Optimization
2184 Perform conversions of switch initializations.
2185
2186 ftree-dce
2187 Common Report Var(flag_tree_dce) Optimization
2188 Enable SSA dead code elimination optimization on trees
2189
2190 ftree-dominator-opts
2191 Common Report Var(flag_tree_dom) Optimization
2192 Enable dominator optimizations
2193
2194 ftree-tail-merge
2195 Common Report Var(flag_tree_tail_merge) Optimization
2196 Enable tail merging on trees
2197
2198 ftree-dse
2199 Common Report Var(flag_tree_dse) Optimization
2200 Enable dead store elimination
2201
2202 ftree-forwprop
2203 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2204 Enable forward propagation on trees
2205
2206 ftree-fre
2207 Common Report Var(flag_tree_fre) Optimization
2208 Enable Full Redundancy Elimination (FRE) on trees
2209
2210 foptimize-strlen
2211 Common Report Var(flag_optimize_strlen) Optimization
2212 Enable string length optimizations on trees
2213
2214 fisolate-erroneous-paths-dereference
2215 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2216 Detect paths which trigger erroneous or undefined behaviour due to
2217 dereferencing a NULL pointer.  Isolate those paths from the main control
2218 flow and turn the statement with erroneous or undefined behaviour into a trap.
2219
2220 fisolate-erroneous-paths-attribute
2221 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2222 Detect paths which trigger erroneous or undefined behaviour due a NULL value
2223 being used in a way which is forbidden by a returns_nonnull or nonnull
2224 attribute.  Isolate those paths from the main control flow and turn the
2225 statement with erroneous or undefined behaviour into a trap.
2226
2227 ftree-loop-distribution
2228 Common Report Var(flag_tree_loop_distribution) Optimization
2229 Enable loop distribution on trees
2230
2231 ftree-loop-distribute-patterns
2232 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2233 Enable loop distribution for patterns transformed into a library call
2234
2235 ftree-loop-im
2236 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2237 Enable loop invariant motion on trees
2238
2239 ftree-loop-linear
2240 Common Alias(floop-interchange)
2241 Enable loop interchange transforms.  Same as -floop-interchange
2242
2243 ftree-loop-ivcanon
2244 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2245 Create canonical induction variables in loops
2246
2247 ftree-loop-optimize
2248 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2249 Enable loop optimizations on tree level
2250
2251 ftree-parallelize-loops=
2252 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2253 Enable automatic parallelization of loops
2254
2255 ftree-phiprop
2256 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2257 Enable hoisting loads from conditional pointers.
2258
2259 ftree-pre
2260 Common Report Var(flag_tree_pre) Optimization
2261 Enable SSA-PRE optimization on trees
2262
2263 ftree-partial-pre
2264 Common Report Var(flag_tree_partial_pre) Optimization
2265 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2266
2267 ftree-pta
2268 Common Report Var(flag_tree_pta) Optimization
2269 Perform function-local points-to analysis on trees.
2270
2271 ftree-reassoc
2272 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2273 Enable reassociation on tree level
2274
2275 ftree-salias
2276 Common Ignore
2277 Does nothing.  Preserved for backward compatibility.
2278
2279 ftree-sink
2280 Common Report Var(flag_tree_sink) Optimization
2281 Enable SSA code sinking on trees
2282
2283 ftree-slsr
2284 Common Report Var(flag_tree_slsr) Optimization
2285 Perform straight-line strength reduction
2286
2287 ftree-sra
2288 Common Report Var(flag_tree_sra) Optimization
2289 Perform scalar replacement of aggregates
2290
2291 ftree-ter
2292 Common Report Var(flag_tree_ter) Optimization
2293 Replace temporary expressions in the SSA->normal pass
2294
2295 ftree-lrs
2296 Common Report Var(flag_tree_live_range_split) Optimization
2297 Perform live range splitting during the SSA->normal pass
2298
2299 ftree-vrp
2300 Common Report Var(flag_tree_vrp) Init(0) Optimization
2301 Perform Value Range Propagation on trees
2302
2303 funit-at-a-time
2304 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2305 Compile whole compilation unit at a time
2306
2307 funroll-loops
2308 Common Report Var(flag_unroll_loops) Optimization
2309 Perform loop unrolling when iteration count is known
2310
2311 funroll-all-loops
2312 Common Report Var(flag_unroll_all_loops) Optimization
2313 Perform loop unrolling for all loops
2314
2315 ; Nonzero means that loop optimizer may assume that the induction variables
2316 ; that control loops do not overflow and that the loops with nontrivial
2317 ; exit condition are not infinite
2318 funsafe-loop-optimizations
2319 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2320 Allow loop optimizations to assume that the loops behave in normal way
2321
2322 fassociative-math
2323 Common Report Var(flag_associative_math) SetByCombined
2324 Allow optimization for floating-point arithmetic which may change the
2325 result of the operation due to rounding.
2326
2327 freciprocal-math
2328 Common Report Var(flag_reciprocal_math) SetByCombined
2329 Same as -fassociative-math for expressions which include division.
2330
2331 ; Nonzero means that unsafe floating-point math optimizations are allowed
2332 ; for the sake of speed.  IEEE compliance is not guaranteed, and operations
2333 ; are allowed to assume that their arguments and results are "normal"
2334 ; (e.g., nonnegative for SQRT).
2335 funsafe-math-optimizations
2336 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2337 Allow math optimizations that may violate IEEE or ISO standards
2338
2339 funswitch-loops
2340 Common Report Var(flag_unswitch_loops) Optimization
2341 Perform loop unswitching
2342
2343 funwind-tables
2344 Common Report Var(flag_unwind_tables) Optimization
2345 Just generate unwind tables for exception handling
2346
2347 fuse-ld=bfd
2348 Common Driver Negative(fuse-ld=gold)
2349 Use the bfd linker instead of the default linker
2350
2351 fuse-ld=gold
2352 Common Driver Negative(fuse-ld=bfd)
2353 Use the gold linker instead of the default linker
2354
2355 fuse-linker-plugin
2356 Common Undocumented Var(flag_use_linker_plugin)
2357
2358 ; Positive if we should track variables, negative if we should run
2359 ; the var-tracking pass only to discard debug annotations, zero if
2360 ; we're not to run it.  When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2361 ; will be set according to optimize, debug_info_level and debug_hooks
2362 ; in process_options ().
2363 fvar-tracking
2364 Common Report Var(flag_var_tracking) Init(2) Optimization
2365 Perform variable tracking
2366
2367 ; Positive if we should track variables at assignments, negative if
2368 ; we should run the var-tracking pass only to discard debug
2369 ; annotations.  When flag_var_tracking_assignments ==
2370 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2371 fvar-tracking-assignments
2372 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2373 Perform variable tracking by annotating assignments
2374
2375 ; Nonzero if we should toggle flag_var_tracking_assignments after
2376 ; processing options and computing its default.  */
2377 fvar-tracking-assignments-toggle
2378 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2379 Toggle -fvar-tracking-assignments
2380
2381 ; Positive if we should track uninitialized variables, negative if
2382 ; we should run the var-tracking pass only to discard debug
2383 ; annotations.  When flag_var_tracking_uninit == AUTODETECT_VALUE it
2384 ; will be set according to flag_var_tracking.
2385 fvar-tracking-uninit
2386 Common Report Var(flag_var_tracking_uninit) Optimization
2387 Perform variable tracking and also tag variables that are uninitialized
2388
2389 ftree-vectorize
2390 Common Report Var(flag_tree_vectorize) Optimization
2391 Enable vectorization on trees
2392
2393 ftree-vectorizer-verbose=
2394 Common Joined RejectNegative Ignore
2395 Does nothing.  Preserved for backward compatibility.
2396
2397 ftree-loop-vectorize
2398 Common Report Var(flag_tree_loop_vectorize) Optimization
2399 Enable loop vectorization on trees
2400
2401 ftree-slp-vectorize
2402 Common Report Var(flag_tree_slp_vectorize) Optimization
2403 Enable basic block vectorization (SLP) on trees
2404
2405 fvect-cost-model=
2406 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT)
2407 Specifies the cost model for vectorization
2408
2409 fsimd-cost-model=
2410 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED)
2411 Specifies the vectorization cost model for code marked with a simd directive
2412
2413 Enum
2414 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2415
2416 EnumValue
2417 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2418
2419 EnumValue
2420 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2421
2422 EnumValue
2423 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2424
2425 fvect-cost-model
2426 Common RejectNegative Alias(fvect-cost-model=,dynamic)
2427 Enables the dynamic vectorizer cost model.  Preserved for backward compatibility.
2428
2429 fno-vect-cost-model
2430 Common RejectNegative Alias(fvect-cost-model=,unlimited)
2431 Enables the unlimited vectorizer cost model.  Preserved for backward compatibility.
2432
2433 ftree-vect-loop-version
2434 Common Ignore
2435 Does nothing. Preserved for backward compatibility.
2436
2437 ftree-scev-cprop
2438 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2439 Enable copy propagation of scalar-evolution information.
2440
2441 ; -fverbose-asm causes extra commentary information to be produced in
2442 ; the generated assembly code (to make it more readable).  This option
2443 ; is generally only of use to those who actually need to read the
2444 ; generated assembly code (perhaps while debugging the compiler itself).
2445 ; -fno-verbose-asm, the default, causes the extra information
2446 ; to not be added and is useful when comparing two assembler files.
2447 fverbose-asm
2448 Common Report Var(flag_verbose_asm)
2449 Add extra commentary to assembler output
2450
2451 fvisibility=
2452 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2453 -fvisibility=[default|internal|hidden|protected]        Set the default symbol visibility
2454
2455 Enum
2456 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2457
2458 EnumValue
2459 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2460
2461 EnumValue
2462 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2463
2464 EnumValue
2465 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2466
2467 EnumValue
2468 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2469
2470 fvtable-verify=
2471 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2472 Validate vtable pointers before using them.
2473
2474 Enum
2475 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2476
2477 EnumValue
2478 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2479
2480 EnumValue
2481 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2482
2483 EnumValue
2484 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2485
2486 fvtv-counts
2487 Common Var(flag_vtv_counts)
2488 Output vtable verification counters.
2489
2490 fvtv-debug
2491 Common Var(flag_vtv_debug)
2492 Output vtable verification pointer sets information.
2493
2494 fvpt
2495 Common Report Var(flag_value_profile_transformations) Optimization
2496 Use expression value profiles in optimizations
2497
2498 fweb
2499 Common Report Var(flag_web) Init(2) Optimization
2500 Construct webs and split unrelated uses of single variable
2501
2502 ftree-builtin-call-dce
2503 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2504 Enable conditional dead code elimination for builtin calls
2505
2506 fwhole-program
2507 Common Report Var(flag_whole_program) Init(0) Optimization
2508 Perform whole program optimizations
2509
2510 fwrapv
2511 Common Report Var(flag_wrapv) Optimization
2512 Assume signed arithmetic overflow wraps around
2513
2514 fzero-initialized-in-bss
2515 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2516 Put zero initialized data in the bss section
2517
2518 g
2519 Common JoinedOrMissing
2520 Generate debug information in default format
2521
2522 gcoff
2523 Common JoinedOrMissing Negative(gdwarf)
2524 Generate debug information in COFF format
2525
2526 gdwarf
2527 Common JoinedOrMissing Negative(gdwarf-)
2528 Generate debug information in default version of DWARF format
2529
2530 gdwarf-
2531 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2532 Generate debug information in DWARF v2 (or later) format
2533
2534 ggdb
2535 Common JoinedOrMissing
2536 Generate debug information in default extended format
2537
2538 gno-pubnames
2539 Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2540 Don't generate DWARF pubnames and pubtypes sections.
2541
2542 gpubnames
2543 Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2544 Generate DWARF pubnames and pubtypes sections.
2545
2546 ggnu-pubnames
2547 Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2548 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2549
2550 gno-record-gcc-switches
2551 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2552 Don't record gcc command line switches in DWARF DW_AT_producer.
2553
2554 grecord-gcc-switches
2555 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2556 Record gcc command line switches in DWARF DW_AT_producer.
2557
2558 gno-split-dwarf
2559 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2560 Don't generate debug information in separate .dwo files
2561
2562 gsplit-dwarf
2563 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2564 Generate debug information in separate .dwo files
2565
2566 gstabs
2567 Common JoinedOrMissing Negative(gstabs+)
2568 Generate debug information in STABS format
2569
2570 gstabs+
2571 Common JoinedOrMissing Negative(gvms)
2572 Generate debug information in extended STABS format
2573
2574 gno-strict-dwarf
2575 Common RejectNegative Var(dwarf_strict,0) Init(0)
2576 Emit DWARF additions beyond selected version
2577
2578 gstrict-dwarf
2579 Common Report RejectNegative Var(dwarf_strict,1)
2580 Don't emit DWARF additions beyond selected version
2581
2582 gtoggle
2583 Common Report Var(flag_gtoggle)
2584 Toggle debug information generation
2585
2586 gvms
2587 Common JoinedOrMissing Negative(gxcoff)
2588 Generate debug information in VMS format
2589
2590 gxcoff
2591 Common JoinedOrMissing Negative(gxcoff+)
2592 Generate debug information in XCOFF format
2593
2594 gxcoff+
2595 Common JoinedOrMissing Negative(gcoff)
2596 Generate debug information in extended XCOFF format
2597
2598 Enum
2599 Name(compressed_debug_sections) Type(int)
2600
2601 ; Since -gz= is completely handled in specs, the values aren't used and we
2602 ; assign arbitrary constants.
2603 EnumValue
2604 Enum(compressed_debug_sections) String(none) Value(0)
2605
2606 EnumValue
2607 Enum(compressed_debug_sections) String(zlib) Value(1)
2608
2609 EnumValue
2610 Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
2611
2612 gz
2613 Common Driver
2614 Generate compressed debug sections
2615
2616 gz=
2617 Common Driver Joined Enum(compressed_debug_sections)
2618 -gz=<format>    Generate compressed debug sections in format <format>
2619
2620 h
2621 Driver Joined Separate
2622
2623 iplugindir=
2624 Common Joined Var(plugindir_string) Init(0)
2625 -iplugindir=<dir>       Set <dir> to be the default plugin directory
2626
2627 imultiarch
2628 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2629 -imultiarch <dir>       Set <dir> to be the multiarch include subdirectory
2630
2631 l
2632 Driver Joined Separate
2633
2634 n
2635 Driver
2636
2637 no-canonical-prefixes
2638 Driver
2639
2640 nodefaultlibs
2641 Driver
2642
2643 nostartfiles
2644 Driver
2645
2646 nostdlib
2647 Driver
2648
2649 o
2650 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2651 -o <file>       Place output into <file>
2652
2653 p
2654 Common Var(profile_flag)
2655 Enable function profiling
2656
2657 pass-exit-codes
2658 Driver Var(pass_exit_codes)
2659
2660 pedantic
2661 Common Alias(Wpedantic)
2662
2663 pedantic-errors
2664 Common Var(flag_pedantic_errors)
2665 Like -pedantic but issue them as errors
2666
2667 pg
2668 Driver
2669
2670 pipe
2671 Driver Var(use_pipes)
2672
2673 print-file-name=
2674 Driver JoinedOrMissing Var(print_file_name)
2675
2676 print-libgcc-file-name
2677 Driver
2678
2679 print-multi-directory
2680 Driver Var(print_multi_directory)
2681
2682 print-multi-lib
2683 Driver Var(print_multi_lib)
2684
2685 print-multi-os-directory
2686 Driver Var(print_multi_os_directory)
2687
2688 print-multiarch
2689 Driver Var(print_multiarch)
2690
2691 print-prog-name=
2692 Driver JoinedOrMissing Var(print_prog_name)
2693
2694 print-search-dirs
2695 Driver Var(print_search_dirs)
2696
2697 print-sysroot
2698 Driver Var(print_sysroot)
2699
2700 print-sysroot-headers-suffix
2701 Driver Var(print_sysroot_headers_suffix)
2702
2703 quiet
2704 Common Var(quiet_flag) RejectDriver
2705 Do not display functions compiled or elapsed time
2706
2707 r
2708 Driver
2709
2710 s
2711 Driver
2712
2713 save-temps
2714 Driver
2715
2716 save-temps=
2717 Driver Joined
2718
2719 t
2720 Driver
2721
2722 time
2723 Driver Var(report_times)
2724
2725 time=
2726 Driver JoinedOrMissing
2727
2728 u
2729 Driver Joined Separate
2730
2731 undef
2732 Driver
2733 ; C option, but driver must not handle as "-u ndef".
2734
2735 v
2736 Common Driver Var(verbose_flag)
2737 Enable verbose output
2738
2739 version
2740 Common Var(version_flag) RejectDriver
2741 Display the compiler's version
2742
2743 w
2744 Common Var(inhibit_warnings)
2745 Suppress warnings
2746
2747 wrapper
2748 Driver Separate Var(wrapper_string)
2749
2750 x
2751 Driver Joined Separate
2752
2753 shared
2754 Driver RejectNegative Negative(pie)
2755 Create a shared library
2756
2757 shared-libgcc
2758 Driver
2759
2760 specs
2761 Driver Separate Alias(specs=)
2762
2763 specs=
2764 Driver Joined
2765
2766 static
2767 Driver
2768
2769 static-libgcc
2770 Driver
2771
2772 static-libgfortran
2773 Driver
2774 ; Documented for Fortran, but always accepted by driver.
2775
2776 static-libstdc++
2777 Driver
2778
2779 static-libgo
2780 Driver
2781 ; Documented for Go, but always accepted by driver.
2782
2783 static-libasan
2784 Driver
2785
2786 static-libtsan
2787 Driver
2788
2789 static-liblsan
2790 Driver
2791
2792 static-libubsan
2793 Driver
2794
2795 symbolic
2796 Driver
2797
2798 pie
2799 Driver RejectNegative Negative(shared)
2800 Create a position independent executable
2801
2802 z
2803 Driver Joined Separate
2804
2805 fuse-caller-save
2806 Common Report Var(flag_use_caller_save) Optimization
2807 Use caller save register across calls if possible
2808
2809 ; This comment is to ensure we retain the blank line above.