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