gcc/common.opt

   1 ; Options for the language- and target-independent parts of the compiler.
   2
   3 ; Copyright (C) 2003-2013 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 ###
 215 Driver
 216
 217 -assemble
 218 Driver Alias(S)
 219
 220 -compile
 221 Driver Alias(c)
 222
 223 -coverage
 224 Driver Alias(coverage)
 225
 226 -debug
 227 Common Alias(g)
 228
 229 -dump
 230 Common Separate Alias(d)
 231
 232 -dump=
 233 Common Joined Alias(d)
 234
 235 -dumpbase
 236 Common Separate Alias(dumpbase)
 237
 238 -dumpdir
 239 Common Separate Alias(dumpdir)
 240
 241 -entry
 242 Driver Separate Alias(e)
 243
 244 -entry=
 245 Driver Joined Alias(e)
 246
 247 -extra-warnings
 248 Common Warning Alias(Wextra)
 249
 250 -for-assembler
 251 Driver Separate Alias(Xassembler)
 252
 253 -for-assembler=
 254 Driver JoinedOrMissing Alias(Xassembler)
 255
 256 -for-linker
 257 Driver Separate Alias(Xlinker)
 258
 259 -for-linker=
 260 Driver JoinedOrMissing Alias(Xlinker)
 261
 262 -force-link
 263 Driver Separate Alias(u)
 264
 265 -force-link=
 266 Driver Joined Alias(u)
 267
 268 -help
 269 Common Driver Var(help_flag)
 270 Display this information
 271
 272 -help=
 273 Common Driver Report Joined
 274 --help=<class>  Display descriptions of a specific class of options.  <class> is one or more of optimizers, target, warnings, undocumented, params
 275
 276 -language
 277 Driver Separate Alias(x)
 278
 279 -language=
 280 Driver Joined Alias(x)
 281
 282 -library-directory
 283 Driver Separate Alias(L)
 284
 285 -library-directory=
 286 Driver Joined Alias(L)
 287
 288 -no-canonical-prefixes
 289 Driver Alias(no-canonical-prefixes)
 290
 291 -no-standard-libraries
 292 Driver Alias(nostdlib)
 293
 294 -no-sysroot-suffix
 295 Driver Var(no_sysroot_suffix)
 296
 297 -no-warnings
 298 Common Alias(w)
 299
 300 -optimize
 301 Common Alias(O)
 302
 303 -output
 304 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
 305
 306 -output=
 307 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
 308
 309 -pass-exit-codes
 310 Driver Alias(pass-exit-codes)
 311
 312 -pedantic
 313 Common Alias(Wpedantic)
 314
 315 -pedantic-errors
 316 Common Alias(pedantic-errors)
 317
 318 -pie
 319 Driver Alias(pie)
 320
 321 -pipe
 322 Driver Alias(pipe)
 323
 324 -prefix
 325 Driver Separate Alias(B)
 326
 327 -prefix=
 328 Driver JoinedOrMissing Alias(B)
 329
 330 -preprocess
 331 Driver Alias(E)
 332
 333 -print-file-name
 334 Driver Separate Alias(print-file-name=)
 335
 336 -print-file-name=
 337 Driver JoinedOrMissing Alias(print-file-name=)
 338
 339 -print-libgcc-file-name
 340 Driver Alias(print-libgcc-file-name)
 341
 342 -print-multi-directory
 343 Driver Alias(print-multi-directory)
 344
 345 -print-multi-lib
 346 Driver Alias(print-multi-lib)
 347
 348 -print-multi-os-directory
 349 Driver Alias(print-multi-os-directory)
 350
 351 -print-multiarch
 352 Driver Alias(print-multiarch)
 353
 354 -print-prog-name
 355 Driver Separate Alias(print-prog-name=)
 356
 357 -print-prog-name=
 358 Driver JoinedOrMissing Alias(print-prog-name=)
 359
 360 -print-search-dirs
 361 Driver Alias(print-search-dirs)
 362
 363 -print-sysroot
 364 Driver Alias(print-sysroot)
 365
 366 -print-sysroot-headers-suffix
 367 Driver Alias(print-sysroot-headers-suffix)
 368
 369 -profile
 370 Common Alias(p)
 371
 372 -save-temps
 373 Driver Alias(save-temps)
 374
 375 -shared
 376 Driver Alias(shared)
 377
 378 -specs
 379 Driver Separate Alias(specs=)
 380
 381 -specs=
 382 Driver Joined Alias(specs=)
 383
 384 -static
 385 Driver Alias(static)
 386
 387 -symbolic
 388 Driver Alias(symbolic)
 389
 390 -target-help
 391 Common Driver
 392 Alias for --help=target
 393
 394 -time
 395 Driver Alias(time)
 396
 397 -verbose
 398 Driver Alias(v)
 399
 400 ;; The driver used to convert options such as --help into forms such
 401 ;; as -fhelp; the following four entries are for compatibility with
 402 ;; any direct uses of those (undocumented) -f forms
 403 fhelp
 404 Common Driver Alias(-help)
 405
 406 fhelp=
 407 Common Driver Joined Alias(-help=)
 408
 409 ftarget-help
 410 Common Driver Alias(-target-help)
 411
 412 fversion
 413 Common Driver Alias(-version)
 414
 415 -param
 416 Common Separate
 417 --param <param>=<value> Set parameter <param> to value.  See below for a complete list of parameters
 418
 419 -param=
 420 Common Joined Alias(-param)
 421
 422 -sysroot
 423 Driver Separate Alias(-sysroot=)
 424
 425 -sysroot=
 426 Driver JoinedOrMissing
 427
 428 -version
 429 Common Driver
 430
 431 B
 432 Driver Joined Separate
 433
 434 E
 435 Driver
 436
 437 L
 438 Driver Joined Separate
 439
 440 N
 441 Driver
 442
 443 O
 444 Common JoinedOrMissing Optimization
 445 -O<number>      Set optimization level to <number>
 446
 447 Os
 448 Common Optimization
 449 Optimize for space rather than speed
 450
 451 Ofast
 452 Common Optimization
 453 Optimize for speed disregarding exact standards compliance
 454
 455 Og
 456 Common Optimization
 457 Optimize for debugging experience rather than speed or size
 458
 459 Q
 460 Driver
 461
 462 Qn
 463 Driver Negative(Qy)
 464
 465 Qy
 466 Driver Negative(Qn)
 467
 468 R
 469 Driver Joined Separate
 470
 471 S
 472 Driver
 473
 474 T
 475 Driver Joined Separate
 476
 477 Tbss
 478 Driver Separate
 479
 480 Tbss=
 481 Driver Joined
 482
 483 Tdata
 484 Driver Separate
 485
 486 Tdata=
 487 Driver Joined
 488
 489 Ttext
 490 Driver Separate
 491
 492 Ttext=
 493 Driver Joined
 494
 495 W
 496 Common RejectNegative Warning Alias(Wextra)
 497 This switch is deprecated; use -Wextra instead
 498
 499 Wa,
 500 Driver JoinedOrMissing
 501
 502 Wl,
 503 Driver JoinedOrMissing
 504
 505 Wp,
 506 Driver JoinedOrMissing
 507
 508 Waggregate-return
 509 Common Var(warn_aggregate_return) Warning
 510 Warn about returning structures, unions or arrays
 511
 512 Waggressive-loop-optimizations
 513 Common Var(warn_aggressive_loop_optimizations) Init(1) Warning
 514 Warn if a loop with constant number of iterations triggers undefined behavior
 515
 516 Warray-bounds
 517 Common Var(warn_array_bounds) Warning
 518 Warn if an array is accessed out of bounds
 519
 520 Wattributes
 521 Common Var(warn_attributes) Init(1) Warning
 522 Warn about inappropriate attribute usage
 523
 524 Wcast-align
 525 Common Var(warn_cast_align) Warning
 526 Warn about pointer casts which increase alignment
 527
 528 Wcpp
 529 Common Var(warn_cpp) Init(1) Warning
 530 Warn when a #warning directive is encountered
 531
 532 Wdeprecated-declarations
 533 Common Var(warn_deprecated_decl) Init(1) Warning
 534 Warn about uses of __attribute__((deprecated)) declarations
 535
 536 Wdisabled-optimization
 537 Common Var(warn_disabled_optimization) Warning
 538 Warn when an optimization pass is disabled
 539
 540 Werror
 541 Common Var(warnings_are_errors)
 542 Treat all warnings as errors
 543
 544 Werror=
 545 Common Joined
 546 Treat specified warning as error
 547
 548 Wextra
 549 Common Var(extra_warnings) Warning
 550 Print extra (possibly unwanted) warnings
 551
 552 Wfatal-errors
 553 Common Var(flag_fatal_errors)
 554 Exit on the first error occurred
 555
 556 Wframe-larger-than=
 557 Common RejectNegative Joined UInteger
 558 -Wframe-larger-than=<number>    Warn if a function's stack frame requires more than <number> bytes
 559
 560 Wfree-nonheap-object
 561 Common Var(warn_free_nonheap_object) Init(1) Warning
 562 Warn when attempting to free a non-heap object
 563
 564 Winline
 565 Common Var(warn_inline) Warning
 566 Warn when an inlined function cannot be inlined
 567
 568 Winvalid-memory-model
 569 Common Var(warn_invalid_memory_model) Init(1) Warning
 570 Warn when an atomic memory model parameter is known to be outside the valid range.
 571
 572 Wlarger-than-
 573 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
 574
 575 Wlarger-than=
 576 Common RejectNegative Joined UInteger Warning
 577 -Wlarger-than=<number>  Warn if an object is larger than <number> bytes
 578
 579 Wunsafe-loop-optimizations
 580 Common Var(warn_unsafe_loop_optimizations) Warning
 581 Warn if the loop cannot be optimized due to nontrivial assumptions.
 582
 583 Wmissing-noreturn
 584 Common Alias(Wsuggest-attribute=noreturn)
 585
 586 Woverflow
 587 Common Var(warn_overflow) Init(1) Warning
 588 Warn about overflow in arithmetic expressions
 589
 590 Wpacked
 591 Common Var(warn_packed) Warning
 592 Warn when the packed attribute has no effect on struct layout
 593
 594 Wpadded
 595 Common Var(warn_padded) Warning
 596 Warn when padding is required to align structure members
 597
 598 Wpedantic
 599 Common Var(pedantic) Warning
 600 Issue warnings needed for strict compliance to the standard
 601
 602 Wshadow
 603 Common Var(warn_shadow) Warning
 604 Warn when one local variable shadows another
 605
 606 Wstack-protector
 607 Common Var(warn_stack_protect) Warning
 608 Warn when not issuing stack smashing protection for some reason
 609
 610 Wstack-usage=
 611 Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
 612 Warn if stack usage might be larger than specified amount
 613
 614 Wstrict-aliasing
 615 Common Warning
 616 Warn about code which might break strict aliasing rules
 617
 618 Wstrict-aliasing=
 619 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
 620 Warn about code which might break strict aliasing rules
 621
 622 Wstrict-overflow
 623 Common Warning
 624 Warn about optimizations that assume that signed overflow is undefined
 625
 626 Wstrict-overflow=
 627 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
 628 Warn about optimizations that assume that signed overflow is undefined
 629
 630 Wsuggest-attribute=const
 631 Common Var(warn_suggest_attribute_const) Warning
 632 Warn about functions which might be candidates for __attribute__((const))
 633
 634 Wsuggest-attribute=pure
 635 Common Var(warn_suggest_attribute_pure) Warning
 636 Warn about functions which might be candidates for __attribute__((pure))
 637
 638 Wsuggest-attribute=noreturn
 639 Common Var(warn_suggest_attribute_noreturn) Warning
 640 Warn about functions which might be candidates for __attribute__((noreturn))
 641
 642 Wsystem-headers
 643 Common Var(warn_system_headers) Warning
 644 Do not suppress warnings from system headers
 645
 646 Wtrampolines
 647 Common Var(warn_trampolines) Warning
 648 Warn whenever a trampoline is generated
 649
 650 Wtype-limits
 651 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
 652 Warn if a comparison is always true or always false due to the limited range of the data type
 653
 654 Wuninitialized
 655 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
 656 Warn about uninitialized automatic variables
 657
 658 Wmaybe-uninitialized
 659 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
 660 Warn about maybe uninitialized automatic variables
 661
 662 Wunreachable-code
 663 Common Ignore
 664 Does nothing. Preserved for backward compatibility.
 665
 666 Wunused
 667 Common Var(warn_unused) Init(0) Warning
 668 Enable all -Wunused- warnings
 669
 670 Wunused-but-set-parameter
 671 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
 672 Warn when a function parameter is only set, otherwise unused
 673
 674 Wunused-but-set-variable
 675 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
 676 Warn when a variable is only set, otherwise unused
 677
 678 Wunused-function
 679 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
 680 Warn when a function is unused
 681
 682 Wunused-label
 683 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
 684 Warn when a label is unused
 685
 686 Wunused-parameter
 687 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
 688 Warn when a function parameter is unused
 689
 690 Wunused-value
 691 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
 692 Warn when an expression value is unused
 693
 694 Wunused-variable
 695 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
 696 Warn when a variable is unused
 697
 698 Wcoverage-mismatch
 699 Common Var(warn_coverage_mismatch) Init(1) Warning
 700 Warn in case profiles in -fprofile-use do not match
 701
 702 Wvector-operation-performance
 703 Common Var(warn_vector_operation_performance) Warning
 704 Warn when a vector operation is compiled outside the SIMD
 705
 706 Xassembler
 707 Driver Separate
 708
 709 Xlinker
 710 Driver Separate
 711
 712 Xpreprocessor
 713 Driver Separate
 714
 715 Z
 716 Driver
 717
 718 aux-info
 719 Common Separate Var(aux_info_file_name)
 720 -aux-info <file>        Emit declaration information into <file>
 721
 722 aux-info=
 723 Common Joined Alias(aux-info)
 724
 725 auxbase
 726 Common Separate RejectDriver Var(aux_base_name)
 727
 728 auxbase-strip
 729 Common Separate RejectDriver
 730
 731 coverage
 732 Driver
 733
 734 c
 735 Driver
 736
 737 d
 738 Common Joined
 739 -d<letters>     Enable dumps from specific passes of the compiler
 740
 741 dumpbase
 742 Common Separate Var(dump_base_name)
 743 -dumpbase <file>        Set the file basename to be used for dumps
 744
 745 dumpdir
 746 Common Separate Var(dump_dir_name)
 747 -dumpdir <dir>  Set the directory name to be used for dumps
 748
 749 dumpmachine
 750 Driver
 751
 752 dumpspecs
 753 Driver
 754
 755 dumpversion
 756 Driver
 757
 758 e
 759 Driver Joined Separate
 760
 761 ; This option has historically been passed down to the linker by an
 762 ; accident of a %{e*} spec, so ensure it continues to be passed down
 763 ; as a single option.  The supported option for this purpose is
 764 ; -rdynamic.  See PR 47390.
 765 export-dynamic
 766 Driver Undocumented
 767
 768 ; The version of the C++ ABI in use.  The following values are allowed:
 769 ;
 770 ; 0: The version of the ABI believed most conformant with the C++ ABI
 771 ;    specification.  This ABI may change as bugs are discovered and fixed.
 772 ;    Therefore, 0 will not necessarily indicate the same ABI in different
 773 ;    versions of G++.
 774 ;
 775 ; 1: The version of the ABI first used in G++ 3.2.
 776 ;
 777 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
 778 ;
 779 ; 3: The version of the ABI that fixes the missing underscore
 780 ;    in template non-type arguments of pointer type.
 781 ;
 782 ; 4: The version of the ABI that introduces unambiguous mangling of
 783 ;    vector types.  First selectable in G++ 4.5.
 784 ;
 785 ; 5: The version of the ABI that ignores attribute const/noreturn
 786 ;    in function pointer mangling, and corrects mangling of decltype and
 787 ;    function parameters used in other parameters and the return type.
 788 ;    First selectable in G++ 4.6.
 789 ;
 790 ; 6: The version of the ABI that doesn't promote scoped enums to int and
 791 ;    changes the mangling of template argument packs, const/static_cast,
 792 ;    prefix ++ and --, and a class scope function used as a template
 793 ;    argument.
 794 ;    First selectable in G++ 4.7.
 795 ;
 796 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
 797 ;    corrects the mangling of lambdas in default argument scope.
 798 ;    First selectable in G++ 4.8.
 799 ;
 800 ; 8: The version of the ABI that corrects the substitution behavior of
 801 ;    function types with function-cv-qualifiers.
 802 ;    First selectable in G++ 4.9.
 803 ;
 804 ; Additional positive integers will be assigned as new versions of
 805 ; the ABI become the default version of the ABI.
 806 fabi-version=
 807 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(2)
 808
 809 faggressive-loop-optimizations
 810 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
 811 Aggressively optimize loops using language constraints
 812
 813 falign-functions
 814 Common Report Var(align_functions,0) Optimization UInteger
 815 Align the start of functions
 816
 817 falign-functions=
 818 Common RejectNegative Joined UInteger Var(align_functions)
 819
 820 falign-jumps
 821 Common Report Var(align_jumps,0) Optimization UInteger
 822 Align labels which are only reached by jumping
 823
 824 falign-jumps=
 825 Common RejectNegative Joined UInteger Var(align_jumps)
 826
 827 falign-labels
 828 Common Report Var(align_labels,0) Optimization UInteger
 829 Align all labels
 830
 831 falign-labels=
 832 Common RejectNegative Joined UInteger Var(align_labels)
 833
 834 falign-loops
 835 Common Report Var(align_loops,0) Optimization UInteger
 836 Align the start of loops
 837
 838 falign-loops=
 839 Common RejectNegative Joined UInteger Var(align_loops)
 840
 841 fargument-alias
 842 Common Ignore
 843 Does nothing. Preserved for backward compatibility.
 844
 845 fargument-noalias
 846 Common Ignore
 847 Does nothing. Preserved for backward compatibility.
 848
 849 fargument-noalias-global
 850 Common Ignore
 851 Does nothing. Preserved for backward compatibility.
 852
 853 fargument-noalias-anything
 854 Common Ignore
 855 Does nothing. Preserved for backward compatibility.
 856
 857 fsanitize=
 858 Common Driver Report Joined
 859 Select what to sanitize
 860
 861 fasynchronous-unwind-tables
 862 Common Report Var(flag_asynchronous_unwind_tables) Optimization
 863 Generate unwind tables that are exact at each instruction boundary
 864
 865 fauto-inc-dec
 866 Common Report Var(flag_auto_inc_dec) Init(1)
 867 Generate auto-inc/dec instructions
 868
 869 ; -fcheck-bounds causes gcc to generate array bounds checks.
 870 ; For C, C++ and ObjC: defaults off.
 871 ; For Java: defaults to on.
 872 ; For Fortran: defaults to off.
 873 fbounds-check
 874 Common Report Var(flag_bounds_check)
 875 Generate code to check bounds before indexing arrays
 876
 877 fbranch-count-reg
 878 Common Report Var(flag_branch_on_count_reg) Init(1) Optimization
 879 Replace add, compare, branch with branch on count register
 880
 881 fbranch-probabilities
 882 Common Report Var(flag_branch_probabilities) Optimization
 883 Use profiling information for branch probabilities
 884
 885 fbranch-target-load-optimize
 886 Common Report Var(flag_branch_target_load_optimize) Optimization
 887 Perform branch target load optimization before prologue / epilogue threading
 888
 889 fbranch-target-load-optimize2
 890 Common Report Var(flag_branch_target_load_optimize2) Optimization
 891 Perform branch target load optimization after prologue / epilogue threading
 892
 893 fbtr-bb-exclusive
 894 Common Report Var(flag_btr_bb_exclusive) Optimization
 895 Restrict target load migration not to re-use registers in any basic block
 896
 897 fcall-saved-
 898 Common Joined RejectNegative Var(common_deferred_options) Defer
 899 -fcall-saved-<register> Mark <register> as being preserved across functions
 900
 901 fcall-used-
 902 Common Joined RejectNegative Var(common_deferred_options) Defer
 903 -fcall-used-<register>  Mark <register> as being corrupted by function calls
 904
 905 ; Nonzero for -fcaller-saves: allocate values in regs that need to
 906 ; be saved across function calls, if that produces overall better code.
 907 ; Optional now, so people can test it.
 908 fcaller-saves
 909 Common Report Var(flag_caller_saves) Optimization
 910 Save registers around function calls
 911
 912 fcheck-data-deps
 913 Common Report Var(flag_check_data_deps)
 914 Compare the results of several data dependence analyzers.
 915
 916 fcombine-stack-adjustments
 917 Common Report Var(flag_combine_stack_adjustments) Optimization
 918 Looks for opportunities to reduce stack adjustments and stack references.
 919
 920 fcommon
 921 Common Report Var(flag_no_common,0) Optimization
 922 Do not put uninitialized globals in the common section
 923
 924 fcompare-debug
 925 Driver
 926 ; Converted by the driver to -fcompare-debug= options.
 927
 928 fcompare-debug=
 929 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
 930 -fcompare-debug[=<opts>]        Compile with and without e.g. -gtoggle, and compare the final-insns dump
 931
 932 fcompare-debug-second
 933 Common Driver RejectNegative Var(flag_compare_debug)
 934 Run only the second compilation of -fcompare-debug
 935
 936 fcompare-elim
 937 Common Report Var(flag_compare_elim_after_reload) Optimization
 938 Perform comparison elimination after register allocation has finished
 939
 940 fconserve-stack
 941 Common Var(flag_conserve_stack) Optimization
 942 Do not perform optimizations increasing noticeably stack usage
 943
 944 fcprop-registers
 945 Common Report Var(flag_cprop_registers) Optimization
 946 Perform a register copy-propagation optimization pass
 947
 948 fcrossjumping
 949 Common Report Var(flag_crossjumping) Optimization
 950 Perform cross-jumping optimization
 951
 952 fcse-follow-jumps
 953 Common Report Var(flag_cse_follow_jumps) Optimization
 954 When running CSE, follow jumps to their targets
 955
 956 fcse-skip-blocks
 957 Common Ignore
 958 Does nothing.  Preserved for backward compatibility.
 959
 960 fcx-limited-range
 961 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
 962 Omit range reduction step when performing complex division
 963
 964 fcx-fortran-rules
 965 Common Report Var(flag_cx_fortran_rules) Optimization
 966 Complex multiplication and division follow Fortran rules
 967
 968 fdata-sections
 969 Common Report Var(flag_data_sections) Optimization
 970 Place data items into their own section
 971
 972 fdbg-cnt-list
 973 Common Report Var(common_deferred_options) Defer
 974 List all available debugging counters with their limits and counts.
 975
 976 fdbg-cnt=
 977 Common RejectNegative Joined Var(common_deferred_options) Defer
 978 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...]     Set the debug counter limit.
 979
 980 fdebug-prefix-map=
 981 Common Joined RejectNegative Var(common_deferred_options) Defer
 982 Map one directory name to another in debug information
 983
 984 fdebug-types-section
 985 Common Report Var(flag_debug_types_section) Init(0)
 986 Output .debug_types section when using DWARF v4 debuginfo.
 987
 988 ; Nonzero for -fdefer-pop: don't pop args after each function call
 989 ; instead save them up to pop many calls' args with one insns.
 990 fdefer-pop
 991 Common Report Var(flag_defer_pop) Optimization
 992 Defer popping functions args from stack until later
 993
 994 fdelayed-branch
 995 Common Report Var(flag_delayed_branch) Optimization
 996 Attempt to fill delay slots of branch instructions
 997
 998 fdelete-dead-exceptions
 999 Common Report Var(flag_delete_dead_exceptions) Init(0)
1000 Delete dead instructions that may throw exceptions
1001
1002 fdelete-null-pointer-checks
1003 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
1004 Delete useless null pointer checks
1005
1006 fdevirtualize-speculatively
1007 Common Report Var(flag_devirtualize_speculatively) Optimization
1008 Perform speculative devirtualization
1009
1010 fdevirtualize
1011 Common Report Var(flag_devirtualize) Optimization
1012 Try to convert virtual calls to direct ones.
1013
1014 fdiagnostics-show-location=
1015 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1016 -fdiagnostics-show-location=[once|every-line]   How often to emit source location at the beginning of line-wrapped diagnostics
1017
1018 ; Required for these enum values.
1019 SourceInclude
1020 pretty-print.h
1021
1022 Enum
1023 Name(diagnostic_prefixing_rule) Type(int)
1024
1025 EnumValue
1026 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1027
1028 EnumValue
1029 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1030
1031 fdiagnostics-show-caret
1032 Common Var(flag_diagnostics_show_caret) Init(1)
1033 Show the source line with a caret indicating the column
1034
1035 fdiagnostics-color
1036 Common Alias(fdiagnostics-color=,always,never)
1037 ;
1038
1039 fdiagnostics-color=
1040 Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1041 -fdiagnostics-color=[never|always|auto] Colorize diagnostics
1042
1043 ; Required for these enum values.
1044 SourceInclude
1045 diagnostic-color.h
1046
1047 Enum
1048 Name(diagnostic_color_rule) Type(int)
1049
1050 EnumValue
1051 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1052
1053 EnumValue
1054 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1055
1056 EnumValue
1057 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1058
1059 fdiagnostics-show-option
1060 Common Var(flag_diagnostics_show_option) Init(1)
1061 Amend appropriate diagnostic messages with the command line option that controls them
1062
1063 fdisable-
1064 Common Joined RejectNegative Var(common_deferred_options) Defer
1065 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1066
1067 fenable-
1068 Common Joined RejectNegative Var(common_deferred_options) Defer
1069 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1070
1071 fdump-
1072 Common Joined RejectNegative Var(common_deferred_options) Defer
1073 -fdump-<type>   Dump various compiler internals to a file
1074
1075 fdump-final-insns
1076 Driver RejectNegative
1077
1078 fdump-final-insns=
1079 Common RejectNegative Joined Var(flag_dump_final_insns)
1080 -fdump-final-insns=filename     Dump to filename the insns at the end of translation
1081
1082 fdump-go-spec=
1083 Common RejectNegative Joined Var(flag_dump_go_spec)
1084 -fdump-go-spec=filename Write all declarations to file as Go code
1085
1086 fdump-noaddr
1087 Common Report Var(flag_dump_noaddr)
1088 Suppress output of addresses in debugging dumps
1089
1090 fdump-passes
1091 Common Var(flag_dump_passes) Init(0)
1092 Dump optimization passes
1093
1094 fdump-unnumbered
1095 Common Report Var(flag_dump_unnumbered)
1096 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1097
1098 fdump-unnumbered-links
1099 Common Report Var(flag_dump_unnumbered_links)
1100 Suppress output of previous and next insn numbers in debugging dumps
1101
1102 fdwarf2-cfi-asm
1103 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1104 Enable CFI tables via GAS assembler directives.
1105
1106 fearly-inlining
1107 Common Report Var(flag_early_inlining) Init(1) Optimization
1108 Perform early inlining
1109
1110 feliminate-dwarf2-dups
1111 Common Report Var(flag_eliminate_dwarf2_dups)
1112 Perform DWARF2 duplicate elimination
1113
1114 fipa-sra
1115 Common Report Var(flag_ipa_sra) Init(0) Optimization
1116 Perform interprocedural reduction of aggregates
1117
1118 feliminate-unused-debug-symbols
1119 Common Report Var(flag_debug_only_used_symbols)
1120 Perform unused type elimination in debug info
1121
1122 feliminate-unused-debug-types
1123 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1124 Perform unused type elimination in debug info
1125
1126 femit-class-debug-always
1127 Common Report Var(flag_emit_class_debug_always) Init(0)
1128 Do not suppress C++ class debug information.
1129
1130 fexceptions
1131 Common Report Var(flag_exceptions) Optimization
1132 Enable exception handling
1133
1134 fexpensive-optimizations
1135 Common Report Var(flag_expensive_optimizations) Optimization
1136 Perform a number of minor, expensive optimizations
1137
1138 fexcess-precision=
1139 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1140 -fexcess-precision=[fast|standard]      Specify handling of excess floating-point precision
1141
1142 Enum
1143 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1144
1145 EnumValue
1146 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1147
1148 EnumValue
1149 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1150
1151 ffast-math
1152 Common
1153
1154 ffat-lto-objects
1155 Common Var(flag_fat_lto_objects) Init(1)
1156 Output lto objects containing both the intermediate language and binary output.
1157
1158 ffinite-math-only
1159 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1160 Assume no NaNs or infinities are generated
1161
1162 ffixed-
1163 Common Joined RejectNegative Var(common_deferred_options) Defer
1164 -ffixed-<register>      Mark <register> as being unavailable to the compiler
1165
1166 ffloat-store
1167 Common Report Var(flag_float_store) Optimization
1168 Don't allocate floats and doubles in extended-precision registers
1169
1170 fforce-addr
1171 Common Ignore
1172 Does nothing.  Preserved for backward compatibility.
1173
1174 fforward-propagate
1175 Common Report Var(flag_forward_propagate) Optimization
1176 Perform a forward propagation pass on RTL
1177
1178 ffp-contract=
1179 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1180 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1181
1182 Enum
1183 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1184
1185 EnumValue
1186 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1187
1188 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1189 EnumValue
1190 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1191
1192 EnumValue
1193 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1194
1195 ; Nonzero means don't put addresses of constant functions in registers.
1196 ; Used for compiling the Unix kernel, where strange substitutions are
1197 ; done on the assembly output.
1198 ffunction-cse
1199 Common Report Var(flag_no_function_cse,0)
1200 Allow function addresses to be held in registers
1201
1202 ffunction-sections
1203 Common Report Var(flag_function_sections)
1204 Place each function into its own section
1205
1206 fgcse
1207 Common Report Var(flag_gcse) Optimization
1208 Perform global common subexpression elimination
1209
1210 fgcse-lm
1211 Common Report Var(flag_gcse_lm) Init(1) Optimization
1212 Perform enhanced load motion during global common subexpression elimination
1213
1214 fgcse-sm
1215 Common Report Var(flag_gcse_sm) Init(0) Optimization
1216 Perform store motion after global common subexpression elimination
1217
1218 fgcse-las
1219 Common Report Var(flag_gcse_las) Init(0) Optimization
1220 Perform redundant load after store elimination in global common subexpression
1221 elimination
1222
1223 fgcse-after-reload
1224 Common Report Var(flag_gcse_after_reload) Optimization
1225 Perform global common subexpression elimination after register allocation
1226 has finished
1227
1228 ; This option is not documented yet as its semantics will change.
1229 fgraphite
1230 Common Report Var(flag_graphite)
1231 Enable in and out of Graphite representation
1232
1233 fgraphite-identity
1234 Common Report Var(flag_graphite_identity) Optimization
1235 Enable Graphite Identity transformation
1236
1237 fhoist-adjacent-loads
1238 Common Report Var(flag_hoist_adjacent_loads) Optimization
1239 Enable hoisting adjacent loads to encourage generating conditional move
1240 instructions
1241
1242 floop-parallelize-all
1243 Common Report Var(flag_loop_parallelize_all) Optimization
1244 Mark all loops as parallel
1245
1246 floop-strip-mine
1247 Common Report Var(flag_loop_strip_mine) Optimization
1248 Enable Loop Strip Mining transformation
1249
1250 floop-interchange
1251 Common Report Var(flag_loop_interchange) Optimization
1252 Enable Loop Interchange transformation
1253
1254 floop-block
1255 Common Report Var(flag_loop_block) Optimization
1256 Enable Loop Blocking transformation
1257
1258 fgnu-tm
1259 Common Report Var(flag_tm)
1260 Enable support for GNU transactional memory
1261
1262 floop-flatten
1263 Common Ignore
1264 Does nothing. Preserved for backward compatibility.
1265
1266 floop-nest-optimize
1267 Common Report Var(flag_loop_optimize_isl) Optimization
1268 Enable the ISL based loop nest optimizer
1269
1270 fstrict-volatile-bitfields
1271 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1272 Force bitfield accesses to match their type width
1273
1274 fguess-branch-probability
1275 Common Report Var(flag_guess_branch_prob) Optimization
1276 Enable guessing of branch probabilities
1277
1278 ; Nonzero means ignore `#ident' directives.  0 means handle them.
1279 ; Generate position-independent code for executables if possible
1280 ; On SVR4 targets, it also controls whether or not to emit a
1281 ; string identifying the compiler.
1282 fident
1283 Common Report Var(flag_no_ident,0)
1284 Process #ident directives
1285
1286 fif-conversion
1287 Common Report Var(flag_if_conversion) Optimization
1288 Perform conversion of conditional jumps to branchless equivalents
1289
1290 fif-conversion2
1291 Common Report Var(flag_if_conversion2) Optimization
1292 Perform conversion of conditional jumps to conditional execution
1293
1294 fstack-reuse=
1295 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1296 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1297
1298 Enum
1299 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1300
1301 EnumValue
1302 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1303
1304 EnumValue
1305 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1306
1307 EnumValue
1308 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1309
1310 ftree-loop-if-convert
1311 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1312 Convert conditional jumps in innermost loops to branchless equivalents
1313
1314 ftree-loop-if-convert-stores
1315 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1316 Also if-convert conditional jumps containing memory writes
1317
1318 ; -finhibit-size-directive inhibits output of .size for ELF.
1319 ; This is used only for compiling crtstuff.c,
1320 ; and it may be extended to other effects
1321 ; needed for crtstuff.c on other systems.
1322 finhibit-size-directive
1323 Common Report Var(flag_inhibit_size_directive)
1324 Do not generate .size directives
1325
1326 findirect-inlining
1327 Common Report Var(flag_indirect_inlining)
1328 Perform indirect inlining
1329
1330 ; General flag to enable inlining.  Specifying -fno-inline will disable
1331 ; all inlining apart from always-inline functions.
1332 finline
1333 Common Report Var(flag_no_inline,0) Init(0) Optimization
1334 Enable inlining of function declared \"inline\", disabling disables all inlining
1335
1336 finline-small-functions
1337 Common Report Var(flag_inline_small_functions) Optimization
1338 Integrate functions into their callers when code size is known not to grow
1339
1340 finline-functions
1341 Common Report Var(flag_inline_functions) Optimization
1342 Integrate functions not declared \"inline\" into their callers when profitable
1343
1344 finline-functions-called-once
1345 Common Report Var(flag_inline_functions_called_once) Optimization
1346 Integrate functions only required by their single caller
1347
1348 finline-limit-
1349 Common RejectNegative Joined Alias(finline-limit=)
1350
1351 finline-limit=
1352 Common RejectNegative Joined UInteger
1353 -finline-limit=<number> Limit the size of inlined functions to <number>
1354
1355 finline-atomics
1356 Common Report Var(flag_inline_atomics) Init(1) Optimization
1357 Inline __atomic operations when a lock free instruction sequence is available.
1358
1359 finstrument-functions
1360 Common Report Var(flag_instrument_function_entry_exit)
1361 Instrument function entry and exit with profiling calls
1362
1363 finstrument-functions-exclude-function-list=
1364 Common RejectNegative Joined
1365 -finstrument-functions-exclude-function-list=name,...  Do not instrument listed functions
1366
1367 finstrument-functions-exclude-file-list=
1368 Common RejectNegative Joined
1369 -finstrument-functions-exclude-file-list=filename,...  Do not instrument functions listed in files
1370
1371 fipa-cp
1372 Common Report Var(flag_ipa_cp) Optimization
1373 Perform interprocedural constant propagation
1374
1375 fipa-cp-clone
1376 Common Report Var(flag_ipa_cp_clone) Optimization
1377 Perform cloning to make Interprocedural constant propagation stronger
1378
1379 fipa-profile
1380 Common Report Var(flag_ipa_profile) Init(0) Optimization
1381 Perform interprocedural profile propagation
1382
1383 fipa-pta
1384 Common Report Var(flag_ipa_pta) Init(0) Optimization
1385 Perform interprocedural points-to analysis
1386
1387 fipa-pure-const
1388 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1389 Discover pure and const functions
1390
1391 fipa-reference
1392 Common Report Var(flag_ipa_reference) Init(0) Optimization
1393 Discover readonly and non addressable static variables
1394
1395 fipa-matrix-reorg
1396 Common Ignore
1397 Does nothing. Preserved for backward compatibility.
1398
1399 fipa-struct-reorg
1400 Common Ignore
1401 Does nothing. Preserved for backward compatibility.
1402
1403 fira-algorithm=
1404 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1405 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1406
1407 Enum
1408 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1409
1410 EnumValue
1411 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1412
1413 EnumValue
1414 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1415
1416 fira-region=
1417 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1418 -fira-region=[one|all|mixed] Set regions for IRA
1419
1420 Enum
1421 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1422
1423 EnumValue
1424 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1425
1426 EnumValue
1427 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1428
1429 EnumValue
1430 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1431
1432 fira-hoist-pressure
1433 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1434 Use IRA based register pressure calculation
1435 in RTL hoist optimizations.
1436
1437 fira-loop-pressure
1438 Common Report Var(flag_ira_loop_pressure)
1439 Use IRA based register pressure calculation
1440 in RTL loop optimizations.
1441
1442 fira-share-save-slots
1443 Common Report Var(flag_ira_share_save_slots) Init(1)
1444 Share slots for saving different hard registers.
1445
1446 fira-share-spill-slots
1447 Common Report Var(flag_ira_share_spill_slots) Init(1)
1448 Share stack slots for spilled pseudo-registers.
1449
1450 fira-verbose=
1451 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1452 -fira-verbose=<number>  Control IRA's level of diagnostic messages.
1453
1454 fivopts
1455 Common Report Var(flag_ivopts) Init(1) Optimization
1456 Optimize induction variables on trees
1457
1458 fjump-tables
1459 Common Var(flag_jump_tables) Init(1) Optimization
1460 Use jump tables for sufficiently large switch statements
1461
1462 fkeep-inline-functions
1463 Common Report Var(flag_keep_inline_functions)
1464 Generate code for functions even if they are fully inlined
1465
1466 fkeep-static-consts
1467 Common Report Var(flag_keep_static_consts) Init(1)
1468 Emit static const variables even if they are not used
1469
1470 fleading-underscore
1471 Common Report Var(flag_leading_underscore) Init(-1)
1472 Give external symbols a leading underscore
1473
1474 floop-optimize
1475 Common Ignore
1476 Does nothing.  Preserved for backward compatibility.
1477
1478 flto
1479 Common
1480 Enable link-time optimization.
1481
1482 flto=
1483 Common RejectNegative Joined Var(flag_lto)
1484 Link-time optimization with number of parallel jobs or jobserver.
1485
1486 flto-partition=1to1
1487 Common Var(flag_lto_partition_1to1)
1488 Partition symbols and vars at linktime based on object files they originate from
1489
1490 flto-partition=balanced
1491 Common Var(flag_lto_partition_balanced)
1492 Partition functions and vars at linktime into approximately same sized buckets
1493
1494 flto-partition=max
1495 Common Var(flag_lto_partition_max)
1496 Put every symbol into separate partition
1497
1498 flto-partition=none
1499 Common Var(flag_lto_partition_none)
1500 Disable partioning and streaming
1501
1502 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1503 flto-compression-level=
1504 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1505 -flto-compression-level=<number>        Use zlib compression level <number> for IL
1506
1507 flto-report
1508 Common Report Var(flag_lto_report) Init(0)
1509 Report various link-time optimization statistics
1510
1511 flto-report-wpa
1512 Common Report Var(flag_lto_report_wpa) Init(0)
1513 Report various link-time optimization statistics for WPA only
1514
1515 fmath-errno
1516 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1517 Set errno after built-in math functions
1518
1519 fmax-errors=
1520 Common Joined RejectNegative UInteger Var(flag_max_errors)
1521 -fmax-errors=<number>   Maximum number of errors to report
1522
1523 fmem-report
1524 Common Report Var(mem_report)
1525 Report on permanent memory allocation
1526
1527 fmem-report-wpa
1528 Common Report Var(mem_report_wpa)
1529 Report on permanent memory allocation in WPA only
1530
1531 ; This will attempt to merge constant section constants, if 1 only
1532 ; string constants and constants from constant pool, if 2 also constant
1533 ; variables.
1534 fmerge-all-constants
1535 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1536 Attempt to merge identical constants and constant variables
1537
1538 fmerge-constants
1539 Common Report Var(flag_merge_constants,1) Optimization
1540 Attempt to merge identical constants across compilation units
1541
1542 fmerge-debug-strings
1543 Common Report Var(flag_merge_debug_strings) Init(1)
1544 Attempt to merge identical debug strings across compilation units
1545
1546 fmessage-length=
1547 Common RejectNegative Joined UInteger
1548 -fmessage-length=<number>       Limit diagnostics to <number> characters per line.  0 suppresses line-wrapping
1549
1550 fmodulo-sched
1551 Common Report Var(flag_modulo_sched) Optimization
1552 Perform SMS based modulo scheduling before the first scheduling pass
1553
1554 fmodulo-sched-allow-regmoves
1555 Common Report Var(flag_modulo_sched_allow_regmoves)
1556 Perform SMS based modulo scheduling with register moves allowed
1557
1558 fmove-loop-invariants
1559 Common Report Var(flag_move_loop_invariants) Init(1) Optimization
1560 Move loop invariant computations out of loops
1561
1562 fdce
1563 Common Var(flag_dce) Init(1) Optimization
1564 Use the RTL dead code elimination pass
1565
1566 fdse
1567 Common Var(flag_dse) Init(1) Optimization
1568 Use the RTL dead store elimination pass
1569
1570 freschedule-modulo-scheduled-loops
1571 Common Report Var(flag_resched_modulo_sched) Optimization
1572 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1573
1574 fnon-call-exceptions
1575 Common Report Var(flag_non_call_exceptions) Optimization
1576 Support synchronous non-call exceptions
1577
1578 fomit-frame-pointer
1579 Common Report Var(flag_omit_frame_pointer) Optimization
1580 When possible do not generate stack frames
1581
1582 fopt-info
1583 Common Report Var(flag_opt_info) Optimization
1584 Enable all optimization info dumps on stderr
1585
1586 fopt-info-
1587 Common Joined RejectNegative Var(common_deferred_options) Defer
1588 -fopt-info[-<type>=filename]    Dump compiler optimization details
1589
1590 foptimize-register-move
1591 Common Report Var(flag_regmove) Optimization
1592 Do the full register move optimization pass
1593
1594 foptimize-sibling-calls
1595 Common Report Var(flag_optimize_sibling_calls) Optimization
1596 Optimize sibling and tail recursive calls
1597
1598 fpartial-inlining
1599 Common Report Var(flag_partial_inlining)
1600 Perform partial inlining
1601
1602 fpre-ipa-mem-report
1603 Common Report Var(pre_ipa_mem_report)
1604 Report on memory allocation before interprocedural optimization
1605
1606 fpost-ipa-mem-report
1607 Common Report Var(post_ipa_mem_report)
1608 Report on memory allocation before interprocedural optimization
1609
1610 fpack-struct
1611 Common Report Var(flag_pack_struct) Optimization
1612 Pack structure members together without holes
1613
1614 fpack-struct=
1615 Common RejectNegative Joined UInteger Optimization
1616 -fpack-struct=<number>  Set initial maximum structure member alignment
1617
1618 fpcc-struct-return
1619 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1620 Return small aggregates in memory, not registers
1621
1622 fpeel-loops
1623 Common Report Var(flag_peel_loops) Optimization
1624 Perform loop peeling
1625
1626 fpeephole
1627 Common Report Var(flag_no_peephole,0) Optimization
1628 Enable machine specific peephole optimizations
1629
1630 fpeephole2
1631 Common Report Var(flag_peephole2) Optimization
1632 Enable an RTL peephole pass before sched2
1633
1634 fPIC
1635 Common Report Var(flag_pic,2) Negative(fPIE)
1636 Generate position-independent code if possible (large mode)
1637
1638 fPIE
1639 Common Report Var(flag_pie,2) Negative(fpic)
1640 Generate position-independent code for executables if possible (large mode)
1641
1642 fpic
1643 Common Report Var(flag_pic,1) Negative(fpie)
1644 Generate position-independent code if possible (small mode)
1645
1646 fpie
1647 Common Report Var(flag_pie,1) Negative(fPIC)
1648 Generate position-independent code for executables if possible (small mode)
1649
1650 fplugin=
1651 Common Joined RejectNegative Var(common_deferred_options) Defer
1652 Specify a plugin to load
1653
1654 fplugin-arg-
1655 Common Joined RejectNegative Var(common_deferred_options) Defer
1656 -fplugin-arg-<name>-<key>[=<value>]     Specify argument <key>=<value> for plugin <name>
1657
1658 fpredictive-commoning
1659 Common Report Var(flag_predictive_commoning) Optimization
1660 Run predictive commoning optimization.
1661
1662 fprefetch-loop-arrays
1663 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1664 Generate prefetch instructions, if available, for arrays in loops
1665
1666 fprofile
1667 Common Report Var(profile_flag)
1668 Enable basic program profiling code
1669
1670 fprofile-arcs
1671 Common Report Var(profile_arc_flag)
1672 Insert arc-based program profiling code
1673
1674 fprofile-dir=
1675 Common Joined RejectNegative Var(profile_data_prefix)
1676 Set the top-level directory for storing the profile data.
1677 The default is 'pwd'.
1678
1679 fprofile-correction
1680 Common Report Var(flag_profile_correction)
1681 Enable correction of flow inconsistent profile data input
1682
1683 fprofile-generate
1684 Common
1685 Enable common options for generating profile info for profile feedback directed optimizations
1686
1687 fprofile-generate=
1688 Common Joined RejectNegative
1689 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1690
1691 fprofile-use
1692 Common Var(flag_profile_use)
1693 Enable common options for performing profile feedback directed optimizations
1694
1695 fprofile-use=
1696 Common Joined RejectNegative
1697 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1698
1699 fprofile-values
1700 Common Report Var(flag_profile_values)
1701 Insert code to profile values of expressions
1702
1703 fprofile-report
1704 Common Report Var(profile_report)
1705 Report on consistency of profile
1706
1707 frandom-seed
1708 Common Var(common_deferred_options) Defer
1709
1710 frandom-seed=
1711 Common Joined RejectNegative Var(common_deferred_options) Defer
1712 -frandom-seed=<string>  Make compile reproducible using <string>
1713
1714 ; This switch causes the command line that was used to create an
1715 ; object file to be recorded into the object file.  The exact format
1716 ; of this recording is target and binary file format dependent.
1717 ; It is related to the -fverbose-asm switch, but that switch only
1718 ; records information in the assembler output file as comments, so
1719 ; they never reach the object file.
1720 frecord-gcc-switches
1721 Common Report Var(flag_record_gcc_switches)
1722 Record gcc command line switches in the object file.
1723
1724 freg-struct-return
1725 Common Report Var(flag_pcc_struct_return,0) Optimization
1726 Return small aggregates in registers
1727
1728 fregmove
1729 Common Report Var(flag_regmove) Optimization
1730 Enables a register move optimization
1731
1732 frename-registers
1733 Common Report Var(flag_rename_registers) Init(2) Optimization
1734 Perform a register renaming optimization pass
1735
1736 freorder-blocks
1737 Common Report Var(flag_reorder_blocks) Optimization
1738 Reorder basic blocks to improve code placement
1739
1740 freorder-blocks-and-partition
1741 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1742 Reorder basic blocks and partition into hot and cold sections
1743
1744 freorder-functions
1745 Common Report Var(flag_reorder_functions) Optimization
1746 Reorder functions to improve code placement
1747
1748 frerun-cse-after-loop
1749 Common Report Var(flag_rerun_cse_after_loop) Optimization
1750 Add a common subexpression elimination pass after loop optimizations
1751
1752 frerun-loop-opt
1753 Common Ignore
1754 Does nothing.  Preserved for backward compatibility.
1755
1756 frounding-math
1757 Common Report Var(flag_rounding_math) Optimization SetByCombined
1758 Disable optimizations that assume default FP rounding behavior
1759
1760 fsched-interblock
1761 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1762 Enable scheduling across basic blocks
1763
1764 fsched-pressure
1765 Common Report Var(flag_sched_pressure) Init(0) Optimization
1766 Enable register pressure sensitive insn scheduling
1767
1768 fsched-spec
1769 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1770 Allow speculative motion of non-loads
1771
1772 fsched-spec-load
1773 Common Report Var(flag_schedule_speculative_load) Optimization
1774 Allow speculative motion of some loads
1775
1776 fsched-spec-load-dangerous
1777 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1778 Allow speculative motion of more loads
1779
1780 fsched-verbose=
1781 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1782 -fsched-verbose=<number>        Set the verbosity level of the scheduler
1783
1784 fsched2-use-superblocks
1785 Common Report Var(flag_sched2_use_superblocks) Optimization
1786 If scheduling post reload, do superblock scheduling
1787
1788 fsched2-use-traces
1789 Common Ignore
1790 Does nothing.  Preserved for backward compatibility.
1791
1792 fschedule-insns
1793 Common Report Var(flag_schedule_insns) Optimization
1794 Reschedule instructions before register allocation
1795
1796 fschedule-insns2
1797 Common Report Var(flag_schedule_insns_after_reload) Optimization
1798 Reschedule instructions after register allocation
1799
1800 ; This flag should be on when a target implements non-trivial
1801 ; scheduling hooks, maybe saving some information for its own sake.
1802 ; On IA64, for example, this is used for correct bundling.
1803 fselective-scheduling
1804 Common Report Var(flag_selective_scheduling) Optimization
1805 Schedule instructions using selective scheduling algorithm
1806
1807 fselective-scheduling2
1808 Common Report Var(flag_selective_scheduling2) Optimization
1809 Run selective scheduling after reload
1810
1811 fsel-sched-pipelining
1812 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1813 Perform software pipelining of inner loops during selective scheduling
1814
1815 fsel-sched-pipelining-outer-loops
1816 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1817 Perform software pipelining of outer loops during selective scheduling
1818
1819 fsel-sched-reschedule-pipelined
1820 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1821 Reschedule pipelined regions without pipelining
1822
1823 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1824 ; of stalled insns into the ready list.
1825 fsched-stalled-insns
1826 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1827 Allow premature scheduling of queued insns
1828
1829 fsched-stalled-insns=
1830 Common RejectNegative Joined UInteger
1831 -fsched-stalled-insns=<number>  Set number of queued insns that can be prematurely scheduled
1832
1833 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1834 ; be examined for a dependency on a stalled insn that is candidate for
1835 ; premature removal from the queue of stalled insns into the ready list (has
1836 ; an effect only if the flag 'sched_stalled_insns' is set).
1837 fsched-stalled-insns-dep
1838 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1839 Set dependence distance checking in premature scheduling of queued insns
1840
1841 fsched-stalled-insns-dep=
1842 Common RejectNegative Joined UInteger
1843 -fsched-stalled-insns-dep=<number>      Set dependence distance checking in premature scheduling of queued insns
1844
1845 fsched-group-heuristic
1846 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1847 Enable the group heuristic in the scheduler
1848
1849 fsched-critical-path-heuristic
1850 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1851 Enable the critical path heuristic in the scheduler
1852
1853 fsched-spec-insn-heuristic
1854 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1855 Enable the speculative instruction heuristic in the scheduler
1856
1857 fsched-rank-heuristic
1858 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1859 Enable the rank heuristic in the scheduler
1860
1861 fsched-last-insn-heuristic
1862 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1863 Enable the last instruction heuristic in the scheduler
1864
1865 fsched-dep-count-heuristic
1866 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1867 Enable the dependent count heuristic in the scheduler
1868
1869 fsection-anchors
1870 Common Report Var(flag_section_anchors) Optimization
1871 Access data in the same section from shared anchor points
1872
1873 fsee
1874 Common Ignore
1875 Does nothing.  Preserved for backward compatibility.
1876
1877 fzee
1878 Common Ignore
1879 Does nothing.  Preserved for backward compatibility.
1880
1881 free
1882 Common Report Var(flag_ree) Init(0)
1883 Turn on Redundant Extensions Elimination pass.
1884
1885 fshow-column
1886 Common Report Var(flag_show_column) Init(1)
1887 Show column numbers in diagnostics, when available.  Default on
1888
1889 fshrink-wrap
1890 Common Report Var(flag_shrink_wrap) Optimization
1891 Emit function prologues only before parts of the function that need it,
1892 rather than at the top of the function.
1893
1894 fsignaling-nans
1895 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1896 Disable optimizations observable by IEEE signaling NaNs
1897
1898 fsigned-zeros
1899 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1900 Disable floating point optimizations that ignore the IEEE signedness of zero
1901
1902 fsingle-precision-constant
1903 Common Report Var(flag_single_precision_constant) Optimization
1904 Convert floating point constants to single precision constants
1905
1906 fsplit-ivs-in-unroller
1907 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1908 Split lifetimes of induction variables when loops are unrolled
1909
1910 fsplit-stack
1911 Common Report Var(flag_split_stack) Init(-1)
1912 Generate discontiguous stack frames
1913
1914 fsplit-wide-types
1915 Common Report Var(flag_split_wide_types) Optimization
1916 Split wide types into independent registers
1917
1918 fvariable-expansion-in-unroller
1919 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1920 Apply variable expansion when loops are unrolled
1921
1922 fstack-check=
1923 Common Report RejectNegative Joined
1924 -fstack-check=[no|generic|specific]     Insert stack checking code into the program
1925
1926 fstack-check
1927 Common Alias(fstack-check=, specific, no)
1928 Insert stack checking code into the program.  Same as -fstack-check=specific
1929
1930 fstack-limit
1931 Common Var(common_deferred_options) Defer
1932
1933 fstack-limit-register=
1934 Common RejectNegative Joined Var(common_deferred_options) Defer
1935 -fstack-limit-register=<register>       Trap if the stack goes past <register>
1936
1937 fstack-limit-symbol=
1938 Common RejectNegative Joined Var(common_deferred_options) Defer
1939 -fstack-limit-symbol=<name>     Trap if the stack goes past symbol <name>
1940
1941 fstack-protector
1942 Common Report Var(flag_stack_protect, 1)
1943 Use propolice as a stack protection method
1944
1945 fstack-protector-all
1946 Common Report RejectNegative Var(flag_stack_protect, 2)
1947 Use a stack protection method for every function
1948
1949 fstack-protector-strong
1950 Common Report RejectNegative Var(flag_stack_protect, 3)
1951 Use a smart stack protection method for certain functions
1952
1953 fstack-usage
1954 Common RejectNegative Var(flag_stack_usage)
1955 Output stack usage information on a per-function basis
1956
1957 fstrength-reduce
1958 Common Ignore
1959 Does nothing.  Preserved for backward compatibility.
1960
1961 ; Nonzero if we should do (language-dependent) alias analysis.
1962 ; Typically, this analysis will assume that expressions of certain
1963 ; types do not alias expressions of certain other types.  Only used
1964 ; if alias analysis (in general) is enabled.
1965 fstrict-aliasing
1966 Common Report Var(flag_strict_aliasing) Optimization
1967 Assume strict aliasing rules apply
1968
1969 fstrict-overflow
1970 Common Report Var(flag_strict_overflow)
1971 Treat signed overflow as undefined
1972
1973 fsync-libcalls
1974 Common Report Var(flag_sync_libcalls) Init(1)
1975 Implement __atomic operations via libcalls to legacy __sync functions
1976
1977 fsyntax-only
1978 Common Report Var(flag_syntax_only)
1979 Check for syntax errors, then stop
1980
1981 ftest-coverage
1982 Common Report Var(flag_test_coverage)
1983 Create data files needed by \"gcov\"
1984
1985 fthread-jumps
1986 Common Report Var(flag_thread_jumps) Optimization
1987 Perform jump threading optimizations
1988
1989 ftime-report
1990 Common Report Var(time_report)
1991 Report the time taken by each compiler pass
1992
1993 ftls-model=
1994 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
1995 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec]      Set the default thread-local storage code generation model
1996
1997 Enum
1998 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
1999
2000 EnumValue
2001 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2002
2003 EnumValue
2004 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2005
2006 EnumValue
2007 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2008
2009 EnumValue
2010 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2011
2012 ftoplevel-reorder
2013 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
2014 Reorder top level functions, variables, and asms
2015
2016 ftracer
2017 Common Report Var(flag_tracer)
2018 Perform superblock formation via tail duplication
2019
2020 ; Zero means that floating-point math operations cannot generate a
2021 ; (user-visible) trap.  This is the case, for example, in nonstop
2022 ; IEEE 754 arithmetic.
2023 ftrapping-math
2024 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2025 Assume floating-point operations can trap
2026
2027 ftrapv
2028 Common Report Var(flag_trapv) Optimization
2029 Trap for signed overflow in addition, subtraction and multiplication
2030
2031 ftree-ccp
2032 Common Report Var(flag_tree_ccp) Optimization
2033 Enable SSA-CCP optimization on trees
2034
2035 ftree-bit-ccp
2036 Common Report Var(flag_tree_bit_ccp) Optimization
2037 Enable SSA-BIT-CCP optimization on trees
2038
2039 ftree-store-ccp
2040 Common Ignore
2041 Does nothing.  Preserved for backward compatibility.
2042
2043 ftree-ch
2044 Common Report Var(flag_tree_ch) Optimization
2045 Enable loop header copying on trees
2046
2047 ftree-coalesce-inlined-vars
2048 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2049 Enable coalescing of copy-related user variables that are inlined
2050
2051 ftree-coalesce-vars
2052 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2053 Enable coalescing of all copy-related user variables
2054
2055 ftree-copyrename
2056 Common Report Var(flag_tree_copyrename) Optimization
2057 Replace SSA temporaries with better names in copies
2058
2059 ftree-copy-prop
2060 Common Report Var(flag_tree_copy_prop) Optimization
2061 Enable copy propagation on trees
2062
2063 ftree-store-copy-prop
2064 Common Ignore
2065 Does nothing.  Preserved for backward compatibility.
2066
2067 ftree-cselim
2068 Common Report Var(flag_tree_cselim) Init(2) Optimization
2069 Transform condition stores into unconditional ones
2070
2071 ftree-switch-conversion
2072 Common Report Var(flag_tree_switch_conversion) Optimization
2073 Perform conversions of switch initializations.
2074
2075 ftree-dce
2076 Common Report Var(flag_tree_dce) Optimization
2077 Enable SSA dead code elimination optimization on trees
2078
2079 ftree-dominator-opts
2080 Common Report Var(flag_tree_dom) Optimization
2081 Enable dominator optimizations
2082
2083 ftree-tail-merge
2084 Common Report Var(flag_tree_tail_merge) Optimization
2085 Enable tail merging on trees
2086
2087 ftree-dse
2088 Common Report Var(flag_tree_dse) Optimization
2089 Enable dead store elimination
2090
2091 ftree-forwprop
2092 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2093 Enable forward propagation on trees
2094
2095 ftree-fre
2096 Common Report Var(flag_tree_fre) Optimization
2097 Enable Full Redundancy Elimination (FRE) on trees
2098
2099 foptimize-strlen
2100 Common Report Var(flag_optimize_strlen) Optimization
2101 Enable string length optimizations on trees
2102
2103 ftree-loop-distribution
2104 Common Report Var(flag_tree_loop_distribution) Optimization
2105 Enable loop distribution on trees
2106
2107 ftree-loop-distribute-patterns
2108 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2109 Enable loop distribution for patterns transformed into a library call
2110
2111 ftree-loop-im
2112 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2113 Enable loop invariant motion on trees
2114
2115 ftree-loop-linear
2116 Common Alias(floop-interchange)
2117 Enable loop interchange transforms.  Same as -floop-interchange
2118
2119 ftree-loop-ivcanon
2120 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2121 Create canonical induction variables in loops
2122
2123 ftree-loop-optimize
2124 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2125 Enable loop optimizations on tree level
2126
2127 ftree-parallelize-loops=
2128 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2129 Enable automatic parallelization of loops
2130
2131 ftree-phiprop
2132 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2133 Enable hoisting loads from conditional pointers.
2134
2135 ftree-pre
2136 Common Report Var(flag_tree_pre) Optimization
2137 Enable SSA-PRE optimization on trees
2138
2139 ftree-partial-pre
2140 Common Report Var(flag_tree_partial_pre) Optimization
2141 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2142
2143 ftree-pta
2144 Common Report Var(flag_tree_pta) Init(1) Optimization
2145 Perform function-local points-to analysis on trees.
2146
2147 ftree-reassoc
2148 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2149 Enable reassociation on tree level
2150
2151 ftree-salias
2152 Common Ignore
2153 Does nothing.  Preserved for backward compatibility.
2154
2155 ftree-sink
2156 Common Report Var(flag_tree_sink) Optimization
2157 Enable SSA code sinking on trees
2158
2159 ftree-slsr
2160 Common Report Var(flag_tree_slsr) Optimization
2161 Perform straight-line strength reduction
2162
2163 ftree-sra
2164 Common Report Var(flag_tree_sra) Optimization
2165 Perform scalar replacement of aggregates
2166
2167 ftree-ter
2168 Common Report Var(flag_tree_ter) Optimization
2169 Replace temporary expressions in the SSA->normal pass
2170
2171 ftree-lrs
2172 Common Report Var(flag_tree_live_range_split) Optimization
2173 Perform live range splitting during the SSA->normal pass
2174
2175 ftree-vrp
2176 Common Report Var(flag_tree_vrp) Init(0) Optimization
2177 Perform Value Range Propagation on trees
2178
2179 funit-at-a-time
2180 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2181 Compile whole compilation unit at a time
2182
2183 funroll-loops
2184 Common Report Var(flag_unroll_loops) Optimization
2185 Perform loop unrolling when iteration count is known
2186
2187 funroll-all-loops
2188 Common Report Var(flag_unroll_all_loops) Optimization
2189 Perform loop unrolling for all loops
2190
2191 ; Nonzero means that loop optimizer may assume that the induction variables
2192 ; that control loops do not overflow and that the loops with nontrivial
2193 ; exit condition are not infinite
2194 funsafe-loop-optimizations
2195 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2196 Allow loop optimizations to assume that the loops behave in normal way
2197
2198 fassociative-math
2199 Common Report Var(flag_associative_math) SetByCombined
2200 Allow optimization for floating-point arithmetic which may change the
2201 result of the operation due to rounding.
2202
2203 freciprocal-math
2204 Common Report Var(flag_reciprocal_math) SetByCombined
2205 Same as -fassociative-math for expressions which include division.
2206
2207 ; Nonzero means that unsafe floating-point math optimizations are allowed
2208 ; for the sake of speed.  IEEE compliance is not guaranteed, and operations
2209 ; are allowed to assume that their arguments and results are "normal"
2210 ; (e.g., nonnegative for SQRT).
2211 funsafe-math-optimizations
2212 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2213 Allow math optimizations that may violate IEEE or ISO standards
2214
2215 funswitch-loops
2216 Common Report Var(flag_unswitch_loops) Optimization
2217 Perform loop unswitching
2218
2219 funwind-tables
2220 Common Report Var(flag_unwind_tables) Optimization
2221 Just generate unwind tables for exception handling
2222
2223 fuse-ld=bfd
2224 Common Negative(fuse-ld=gold)
2225 Use the bfd linker instead of the default linker
2226
2227 fuse-ld=gold
2228 Common Negative(fuse-ld=bfd)
2229 Use the gold linker instead of the default linker
2230
2231 fuse-linker-plugin
2232 Common Undocumented
2233
2234 ; Positive if we should track variables, negative if we should run
2235 ; the var-tracking pass only to discard debug annotations, zero if
2236 ; we're not to run it.  When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2237 ; will be set according to optimize, debug_info_level and debug_hooks
2238 ; in process_options ().
2239 fvar-tracking
2240 Common Report Var(flag_var_tracking) Init(2) Optimization
2241 Perform variable tracking
2242
2243 ; Positive if we should track variables at assignments, negative if
2244 ; we should run the var-tracking pass only to discard debug
2245 ; annotations.  When flag_var_tracking_assignments ==
2246 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2247 fvar-tracking-assignments
2248 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2249 Perform variable tracking by annotating assignments
2250
2251 ; Nonzero if we should toggle flag_var_tracking_assignments after
2252 ; processing options and computing its default.  */
2253 fvar-tracking-assignments-toggle
2254 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2255 Toggle -fvar-tracking-assignments
2256
2257 ; Positive if we should track uninitialized variables, negative if
2258 ; we should run the var-tracking pass only to discard debug
2259 ; annotations.  When flag_var_tracking_uninit == AUTODETECT_VALUE it
2260 ; will be set according to flag_var_tracking.
2261 fvar-tracking-uninit
2262 Common Report Var(flag_var_tracking_uninit) Optimization
2263 Perform variable tracking and also tag variables that are uninitialized
2264
2265 ftree-vectorize
2266 Common Report Var(flag_tree_vectorize) Optimization
2267 Enable vectorization on trees
2268
2269 ftree-vectorizer-verbose=
2270 Common RejectNegative Joined UInteger Var(common_deferred_options) Defer
2271 -ftree-vectorizer-verbose=<number>      This switch is deprecated. Use -fopt-info instead.
2272
2273 ftree-loop-vectorize
2274 Common Report Var(flag_tree_loop_vectorize) Optimization
2275 Enable loop vectorization on trees
2276
2277 ftree-slp-vectorize
2278 Common Report Var(flag_tree_slp_vectorize) Optimization
2279 Enable basic block vectorization (SLP) on trees
2280
2281 fvect-cost-model
2282 Common Report Var(flag_vect_cost_model) Optimization
2283 Enable use of cost model in vectorization
2284
2285 ftree-vect-loop-version
2286 Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization
2287 Enable loop versioning when doing loop vectorization on trees
2288
2289 ftree-scev-cprop
2290 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2291 Enable copy propagation of scalar-evolution information.
2292
2293 ; -fverbose-asm causes extra commentary information to be produced in
2294 ; the generated assembly code (to make it more readable).  This option
2295 ; is generally only of use to those who actually need to read the
2296 ; generated assembly code (perhaps while debugging the compiler itself).
2297 ; -fno-verbose-asm, the default, causes the extra information
2298 ; to not be added and is useful when comparing two assembler files.
2299 fverbose-asm
2300 Common Report Var(flag_verbose_asm)
2301 Add extra commentary to assembler output
2302
2303 fvisibility=
2304 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2305 -fvisibility=[default|internal|hidden|protected]        Set the default symbol visibility
2306
2307 Enum
2308 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2309
2310 EnumValue
2311 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2312
2313 EnumValue
2314 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2315
2316 EnumValue
2317 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2318
2319 EnumValue
2320 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2321
2322 fvtable-verify=
2323 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2324 Validate vtable pointers before using them.
2325
2326 Enum
2327 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2328
2329 EnumValue
2330 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2331
2332 EnumValue
2333 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2334
2335 EnumValue
2336 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2337
2338 fvtv-counts
2339 Common Var(flag_vtv_counts)
2340 Output vtable verification counters.
2341
2342 fvtv-debug
2343 Common Var(flag_vtv_debug)
2344 Output vtable verification pointer sets information.
2345
2346 fvpt
2347 Common Report Var(flag_value_profile_transformations) Optimization
2348 Use expression value profiles in optimizations
2349
2350 fweb
2351 Common Report Var(flag_web) Init(2) Optimization
2352 Construct webs and split unrelated uses of single variable
2353
2354 ftree-builtin-call-dce
2355 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2356 Enable conditional dead code elimination for builtin calls
2357
2358 fwhole-program
2359 Common Report Var(flag_whole_program) Init(0) Optimization
2360 Perform whole program optimizations
2361
2362 fwrapv
2363 Common Report Var(flag_wrapv) Optimization
2364 Assume signed arithmetic overflow wraps around
2365
2366 fzero-initialized-in-bss
2367 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2368 Put zero initialized data in the bss section
2369
2370 g
2371 Common JoinedOrMissing
2372 Generate debug information in default format
2373
2374 gcoff
2375 Common JoinedOrMissing Negative(gdwarf)
2376 Generate debug information in COFF format
2377
2378 gdwarf
2379 Common JoinedOrMissing Negative(gdwarf-)
2380 Generate debug information in default version of DWARF format
2381
2382 gdwarf-
2383 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2384 Generate debug information in DWARF v2 (or later) format
2385
2386 ggdb
2387 Common JoinedOrMissing
2388 Generate debug information in default extended format
2389
2390 gno-pubnames
2391 Common RejectNegative Var(debug_generate_pub_sections, 0) Init(-1)
2392 Don't generate DWARF pubnames and pubtypes sections.
2393
2394 gpubnames
2395 Common RejectNegative Var(debug_generate_pub_sections, 1)
2396 Generate DWARF pubnames and pubtypes sections.
2397
2398 gno-record-gcc-switches
2399 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2400 Don't record gcc command line switches in DWARF DW_AT_producer.
2401
2402 grecord-gcc-switches
2403 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2404 Record gcc command line switches in DWARF DW_AT_producer.
2405
2406 gno-split-dwarf
2407 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2408 Don't generate debug information in separate .dwo files
2409
2410 gsplit-dwarf
2411 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2412 Generate debug information in separate .dwo files
2413
2414 gstabs
2415 Common JoinedOrMissing Negative(gstabs+)
2416 Generate debug information in STABS format
2417
2418 gstabs+
2419 Common JoinedOrMissing Negative(gvms)
2420 Generate debug information in extended STABS format
2421
2422 gno-strict-dwarf
2423 Common RejectNegative Var(dwarf_strict,0) Init(0)
2424 Emit DWARF additions beyond selected version
2425
2426 gstrict-dwarf
2427 Common Report RejectNegative Var(dwarf_strict,1)
2428 Don't emit DWARF additions beyond selected version
2429
2430 gtoggle
2431 Common Report Var(flag_gtoggle)
2432 Toggle debug information generation
2433
2434 gvms
2435 Common JoinedOrMissing Negative(gxcoff)
2436 Generate debug information in VMS format
2437
2438 gxcoff
2439 Common JoinedOrMissing Negative(gxcoff+)
2440 Generate debug information in XCOFF format
2441
2442 gxcoff+
2443 Common JoinedOrMissing Negative(gcoff)
2444 Generate debug information in extended XCOFF format
2445
2446 h
2447 Driver Joined Separate
2448
2449 iplugindir=
2450 Common Joined Var(plugindir_string) Init(0)
2451 -iplugindir=<dir>       Set <dir> to be the default plugin directory
2452
2453 imultiarch
2454 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2455 -imultiarch <dir>       Set <dir> to be the multiarch include subdirectory
2456
2457 l
2458 Driver Joined Separate
2459
2460 n
2461 Driver
2462
2463 no-canonical-prefixes
2464 Driver
2465
2466 nodefaultlibs
2467 Driver
2468
2469 nostartfiles
2470 Driver
2471
2472 nostdlib
2473 Driver
2474
2475 o
2476 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2477 -o <file>       Place output into <file>
2478
2479 p
2480 Common Var(profile_flag)
2481 Enable function profiling
2482
2483 pass-exit-codes
2484 Driver Var(pass_exit_codes)
2485
2486 pedantic
2487 Common Alias(Wpedantic)
2488
2489 pedantic-errors
2490 Common Var(flag_pedantic_errors)
2491 Like -pedantic but issue them as errors
2492
2493 pg
2494 Driver
2495
2496 pipe
2497 Driver Var(use_pipes)
2498
2499 print-file-name=
2500 Driver JoinedOrMissing Var(print_file_name)
2501
2502 print-libgcc-file-name
2503 Driver
2504
2505 print-multi-directory
2506 Driver Var(print_multi_directory)
2507
2508 print-multi-lib
2509 Driver Var(print_multi_lib)
2510
2511 print-multi-os-directory
2512 Driver Var(print_multi_os_directory)
2513
2514 print-multiarch
2515 Driver Var(print_multiarch)
2516
2517 print-prog-name=
2518 Driver JoinedOrMissing Var(print_prog_name)
2519
2520 print-search-dirs
2521 Driver Var(print_search_dirs)
2522
2523 print-sysroot
2524 Driver Var(print_sysroot)
2525
2526 print-sysroot-headers-suffix
2527 Driver Var(print_sysroot_headers_suffix)
2528
2529 quiet
2530 Common Var(quiet_flag) RejectDriver
2531 Do not display functions compiled or elapsed time
2532
2533 r
2534 Driver
2535
2536 s
2537 Driver
2538
2539 save-temps
2540 Driver
2541
2542 save-temps=
2543 Driver Joined
2544
2545 t
2546 Driver
2547
2548 time
2549 Driver Var(report_times)
2550
2551 time=
2552 Driver JoinedOrMissing
2553
2554 u
2555 Driver Joined Separate
2556
2557 undef
2558 Driver
2559 ; C option, but driver must not handle as "-u ndef".
2560
2561 v
2562 Common Driver Var(verbose_flag)
2563 Enable verbose output
2564
2565 version
2566 Common Var(version_flag) RejectDriver
2567 Display the compiler's version
2568
2569 w
2570 Common Var(inhibit_warnings)
2571 Suppress warnings
2572
2573 wrapper
2574 Driver Separate Var(wrapper_string)
2575
2576 x
2577 Driver Joined Separate
2578
2579 shared
2580 Driver RejectNegative Negative(pie)
2581 Create a shared library
2582
2583 shared-libgcc
2584 Driver
2585
2586 specs
2587 Driver Separate Alias(specs=)
2588
2589 specs=
2590 Driver Joined
2591
2592 static
2593 Driver
2594
2595 static-libgcc
2596 Driver
2597
2598 static-libgfortran
2599 Driver
2600 ; Documented for Fortran, but always accepted by driver.
2601
2602 static-libstdc++
2603 Driver
2604
2605 static-libgo
2606 Driver
2607 ; Documented for Go, but always accepted by driver.
2608
2609 static-libasan
2610 Driver
2611
2612 static-libtsan
2613 Driver
2614
2615 static-libubsan
2616 Driver
2617
2618 symbolic
2619 Driver
2620
2621 pie
2622 Driver RejectNegative Negative(shared)
2623 Create a position independent executable
2624
2625 z
2626 Driver Joined Separate
2627
2628 ; This comment is to ensure we retain the blank line above.