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 ###
 211 Driver
 212
 213 -assemble
 214 Driver Alias(S)
 215
 216 -compile
 217 Driver Alias(c)
 218
 219 -coverage
 220 Driver Alias(coverage)
 221
 222 -debug
 223 Common Alias(g)
 224
 225 -dump
 226 Common Separate Alias(d)
 227
 228 -dump=
 229 Common Joined Alias(d)
 230
 231 -dumpbase
 232 Common Separate Alias(dumpbase)
 233
 234 -dumpdir
 235 Common Separate Alias(dumpdir)
 236
 237 -entry
 238 Driver Separate Alias(e)
 239
 240 -entry=
 241 Driver Joined Alias(e)
 242
 243 -extra-warnings
 244 Common Warning Alias(Wextra)
 245
 246 -for-assembler
 247 Driver Separate Alias(Xassembler)
 248
 249 -for-assembler=
 250 Driver JoinedOrMissing Alias(Xassembler)
 251
 252 -for-linker
 253 Driver Separate Alias(Xlinker)
 254
 255 -for-linker=
 256 Driver JoinedOrMissing Alias(Xlinker)
 257
 258 -force-link
 259 Driver Separate Alias(u)
 260
 261 -force-link=
 262 Driver Joined Alias(u)
 263
 264 -help
 265 Common Driver Var(help_flag)
 266 Display this information
 267
 268 -help=
 269 Common Driver Report Joined
 270 --help=<class>  Display descriptions of a specific class of options.  <class> is one or more of optimizers, target, warnings, undocumented, params
 271
 272 -language
 273 Driver Separate Alias(x)
 274
 275 -language=
 276 Driver Joined Alias(x)
 277
 278 -library-directory
 279 Driver Separate Alias(L)
 280
 281 -library-directory=
 282 Driver Joined Alias(L)
 283
 284 -no-canonical-prefixes
 285 Driver Alias(no-canonical-prefixes)
 286
 287 -no-standard-libraries
 288 Driver Alias(nostdlib)
 289
 290 -no-sysroot-suffix
 291 Driver Var(no_sysroot_suffix)
 292
 293 -no-warnings
 294 Common Alias(w)
 295
 296 -optimize
 297 Common Alias(O)
 298
 299 -output
 300 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
 301
 302 -output=
 303 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
 304
 305 -pass-exit-codes
 306 Driver Alias(pass-exit-codes)
 307
 308 -pedantic
 309 Common Alias(Wpedantic)
 310
 311 -pedantic-errors
 312 Common Alias(pedantic-errors)
 313
 314 -pie
 315 Driver Alias(pie)
 316
 317 -pipe
 318 Driver Alias(pipe)
 319
 320 -prefix
 321 Driver Separate Alias(B)
 322
 323 -prefix=
 324 Driver JoinedOrMissing Alias(B)
 325
 326 -preprocess
 327 Driver Alias(E)
 328
 329 -print-file-name
 330 Driver Separate Alias(print-file-name=)
 331
 332 -print-file-name=
 333 Driver JoinedOrMissing Alias(print-file-name=)
 334
 335 -print-libgcc-file-name
 336 Driver Alias(print-libgcc-file-name)
 337
 338 -print-multi-directory
 339 Driver Alias(print-multi-directory)
 340
 341 -print-multi-lib
 342 Driver Alias(print-multi-lib)
 343
 344 -print-multi-os-directory
 345 Driver Alias(print-multi-os-directory)
 346
 347 -print-multiarch
 348 Driver Alias(print-multiarch)
 349
 350 -print-prog-name
 351 Driver Separate Alias(print-prog-name=)
 352
 353 -print-prog-name=
 354 Driver JoinedOrMissing Alias(print-prog-name=)
 355
 356 -print-search-dirs
 357 Driver Alias(print-search-dirs)
 358
 359 -print-sysroot
 360 Driver Alias(print-sysroot)
 361
 362 -print-sysroot-headers-suffix
 363 Driver Alias(print-sysroot-headers-suffix)
 364
 365 -profile
 366 Common Alias(p)
 367
 368 -save-temps
 369 Driver Alias(save-temps)
 370
 371 -shared
 372 Driver Alias(shared)
 373
 374 -specs
 375 Driver Separate Alias(specs=)
 376
 377 -specs=
 378 Driver Joined Alias(specs=)
 379
 380 -static
 381 Driver Alias(static)
 382
 383 -symbolic
 384 Driver Alias(symbolic)
 385
 386 -target-help
 387 Common Driver
 388 Alias for --help=target
 389
 390 -time
 391 Driver Alias(time)
 392
 393 -verbose
 394 Driver Alias(v)
 395
 396 ;; The driver used to convert options such as --help into forms such
 397 ;; as -fhelp; the following four entries are for compatibility with
 398 ;; any direct uses of those (undocumented) -f forms
 399 fhelp
 400 Common Driver Alias(-help)
 401
 402 fhelp=
 403 Common Driver Joined Alias(-help=)
 404
 405 ftarget-help
 406 Common Driver Alias(-target-help)
 407
 408 fversion
 409 Common Driver Alias(-version)
 410
 411 -param
 412 Common Separate
 413 --param <param>=<value> Set parameter <param> to value.  See below for a complete list of parameters
 414
 415 -param=
 416 Common Joined Alias(-param)
 417
 418 -sysroot
 419 Driver Separate Alias(-sysroot=)
 420
 421 -sysroot=
 422 Driver JoinedOrMissing
 423
 424 -version
 425 Common Driver
 426
 427 B
 428 Driver Joined Separate
 429
 430 E
 431 Driver
 432
 433 L
 434 Driver Joined Separate
 435
 436 N
 437 Driver
 438
 439 O
 440 Common JoinedOrMissing Optimization
 441 -O<number>      Set optimization level to <number>
 442
 443 Os
 444 Common Optimization
 445 Optimize for space rather than speed
 446
 447 Ofast
 448 Common Optimization
 449 Optimize for speed disregarding exact standards compliance
 450
 451 Og
 452 Common Optimization
 453 Optimize for debugging experience rather than speed or size
 454
 455 Q
 456 Driver
 457
 458 Qn
 459 Driver Negative(Qy)
 460
 461 Qy
 462 Driver Negative(Qn)
 463
 464 R
 465 Driver Joined Separate
 466
 467 S
 468 Driver
 469
 470 T
 471 Driver Joined Separate
 472
 473 Tbss
 474 Driver Separate
 475
 476 Tbss=
 477 Driver Joined
 478
 479 Tdata
 480 Driver Separate
 481
 482 Tdata=
 483 Driver Joined
 484
 485 Ttext
 486 Driver Separate
 487
 488 Ttext=
 489 Driver Joined
 490
 491 W
 492 Common RejectNegative Warning Alias(Wextra)
 493 This switch is deprecated; use -Wextra instead
 494
 495 Wa,
 496 Driver JoinedOrMissing
 497
 498 Wl,
 499 Driver JoinedOrMissing
 500
 501 Wp,
 502 Driver JoinedOrMissing
 503
 504 Waggregate-return
 505 Common Var(warn_aggregate_return) Warning
 506 Warn about returning structures, unions or arrays
 507
 508 Waggressive-loop-optimizations
 509 Common Var(warn_aggressive_loop_optimizations) Init(1) Warning
 510 Warn if a loop with constant number of iterations triggers undefined behavior
 511
 512 Warray-bounds
 513 Common Var(warn_array_bounds) Warning
 514 Warn if an array is accessed out of bounds
 515
 516 Wattributes
 517 Common Var(warn_attributes) Init(1) Warning
 518 Warn about inappropriate attribute usage
 519
 520 Wcast-align
 521 Common Var(warn_cast_align) Warning
 522 Warn about pointer casts which increase alignment
 523
 524 Wcpp
 525 Common Var(warn_cpp) Init(1) Warning
 526 Warn when a #warning directive is encountered
 527
 528 Wdeprecated-declarations
 529 Common Var(warn_deprecated_decl) Init(1) Warning
 530 Warn about uses of __attribute__((deprecated)) declarations
 531
 532 Wdisabled-optimization
 533 Common Var(warn_disabled_optimization) Warning
 534 Warn when an optimization pass is disabled
 535
 536 Werror
 537 Common Var(warnings_are_errors)
 538 Treat all warnings as errors
 539
 540 Werror=
 541 Common Joined
 542 Treat specified warning as error
 543
 544 Wextra
 545 Common Var(extra_warnings) Warning
 546 Print extra (possibly unwanted) warnings
 547
 548 Wfatal-errors
 549 Common Var(flag_fatal_errors)
 550 Exit on the first error occurred
 551
 552 Wframe-larger-than=
 553 Common RejectNegative Joined UInteger
 554 -Wframe-larger-than=<number>    Warn if a function's stack frame requires more than <number> bytes
 555
 556 Wfree-nonheap-object
 557 Common Var(warn_free_nonheap_object) Init(1) Warning
 558 Warn when attempting to free a non-heap object
 559
 560 Winline
 561 Common Var(warn_inline) Warning
 562 Warn when an inlined function cannot be inlined
 563
 564 Winvalid-memory-model
 565 Common Var(warn_invalid_memory_model) Init(1) Warning
 566 Warn when an atomic memory model parameter is known to be outside the valid range.
 567
 568 Wlarger-than-
 569 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
 570
 571 Wlarger-than=
 572 Common RejectNegative Joined UInteger Warning
 573 -Wlarger-than=<number>  Warn if an object is larger than <number> bytes
 574
 575 Wunsafe-loop-optimizations
 576 Common Var(warn_unsafe_loop_optimizations) Warning
 577 Warn if the loop cannot be optimized due to nontrivial assumptions.
 578
 579 Wmissing-noreturn
 580 Common Alias(Wsuggest-attribute=noreturn)
 581
 582 Woverflow
 583 Common Var(warn_overflow) Init(1) Warning
 584 Warn about overflow in arithmetic expressions
 585
 586 Wpacked
 587 Common Var(warn_packed) Warning
 588 Warn when the packed attribute has no effect on struct layout
 589
 590 Wpadded
 591 Common Var(warn_padded) Warning
 592 Warn when padding is required to align structure members
 593
 594 Wpedantic
 595 Common Var(pedantic) Warning
 596 Issue warnings needed for strict compliance to the standard
 597
 598 Wshadow
 599 Common Var(warn_shadow) Warning
 600 Warn when one local variable shadows another
 601
 602 Wstack-protector
 603 Common Var(warn_stack_protect) Warning
 604 Warn when not issuing stack smashing protection for some reason
 605
 606 Wstack-usage=
 607 Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
 608 Warn if stack usage might be larger than specified amount
 609
 610 Wstrict-aliasing
 611 Common Warning
 612 Warn about code which might break strict aliasing rules
 613
 614 Wstrict-aliasing=
 615 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
 616 Warn about code which might break strict aliasing rules
 617
 618 Wstrict-overflow
 619 Common Warning
 620 Warn about optimizations that assume that signed overflow is undefined
 621
 622 Wstrict-overflow=
 623 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
 624 Warn about optimizations that assume that signed overflow is undefined
 625
 626 Wsuggest-attribute=const
 627 Common Var(warn_suggest_attribute_const) Warning
 628 Warn about functions which might be candidates for __attribute__((const))
 629
 630 Wsuggest-attribute=pure
 631 Common Var(warn_suggest_attribute_pure) Warning
 632 Warn about functions which might be candidates for __attribute__((pure))
 633
 634 Wsuggest-attribute=noreturn
 635 Common Var(warn_suggest_attribute_noreturn) Warning
 636 Warn about functions which might be candidates for __attribute__((noreturn))
 637
 638 Wsystem-headers
 639 Common Var(warn_system_headers) Warning
 640 Do not suppress warnings from system headers
 641
 642 Wtrampolines
 643 Common Var(warn_trampolines) Warning
 644 Warn whenever a trampoline is generated
 645
 646 Wtype-limits
 647 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
 648 Warn if a comparison is always true or always false due to the limited range of the data type
 649
 650 Wuninitialized
 651 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
 652 Warn about uninitialized automatic variables
 653
 654 Wmaybe-uninitialized
 655 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
 656 Warn about maybe uninitialized automatic variables
 657
 658 Wunreachable-code
 659 Common Ignore
 660 Does nothing. Preserved for backward compatibility.
 661
 662 Wunused
 663 Common Var(warn_unused) Init(0) Warning
 664 Enable all -Wunused- warnings
 665
 666 Wunused-but-set-parameter
 667 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
 668 Warn when a function parameter is only set, otherwise unused
 669
 670 Wunused-but-set-variable
 671 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
 672 Warn when a variable is only set, otherwise unused
 673
 674 Wunused-function
 675 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
 676 Warn when a function is unused
 677
 678 Wunused-label
 679 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
 680 Warn when a label is unused
 681
 682 Wunused-parameter
 683 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
 684 Warn when a function parameter is unused
 685
 686 Wunused-value
 687 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
 688 Warn when an expression value is unused
 689
 690 Wunused-variable
 691 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
 692 Warn when a variable is unused
 693
 694 Wcoverage-mismatch
 695 Common Var(warn_coverage_mismatch) Init(1) Warning
 696 Warn in case profiles in -fprofile-use do not match
 697
 698 Wvector-operation-performance
 699 Common Var(warn_vector_operation_performance) Warning
 700 Warn when a vector operation is compiled outside the SIMD
 701
 702 Xassembler
 703 Driver Separate
 704
 705 Xlinker
 706 Driver Separate
 707
 708 Xpreprocessor
 709 Driver Separate
 710
 711 Z
 712 Driver
 713
 714 aux-info
 715 Common Separate Var(aux_info_file_name)
 716 -aux-info <file>        Emit declaration information into <file>
 717
 718 aux-info=
 719 Common Joined Alias(aux-info)
 720
 721 auxbase
 722 Common Separate RejectDriver Var(aux_base_name)
 723
 724 auxbase-strip
 725 Common Separate RejectDriver
 726
 727 coverage
 728 Driver
 729
 730 c
 731 Driver
 732
 733 d
 734 Common Joined
 735 -d<letters>     Enable dumps from specific passes of the compiler
 736
 737 dumpbase
 738 Common Separate Var(dump_base_name)
 739 -dumpbase <file>        Set the file basename to be used for dumps
 740
 741 dumpdir
 742 Common Separate Var(dump_dir_name)
 743 -dumpdir <dir>  Set the directory name to be used for dumps
 744
 745 dumpmachine
 746 Driver
 747
 748 dumpspecs
 749 Driver
 750
 751 dumpversion
 752 Driver
 753
 754 e
 755 Driver Joined Separate
 756
 757 ; This option has historically been passed down to the linker by an
 758 ; accident of a %{e*} spec, so ensure it continues to be passed down
 759 ; as a single option.  The supported option for this purpose is
 760 ; -rdynamic.  See PR 47390.
 761 export-dynamic
 762 Driver Undocumented
 763
 764 ; The version of the C++ ABI in use.  The following values are allowed:
 765 ;
 766 ; 0: The version of the ABI believed most conformant with the C++ ABI
 767 ;    specification.  This ABI may change as bugs are discovered and fixed.
 768 ;    Therefore, 0 will not necessarily indicate the same ABI in different
 769 ;    versions of G++.
 770 ;
 771 ; 1: The version of the ABI first used in G++ 3.2.
 772 ;
 773 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
 774 ;
 775 ; 3: The version of the ABI that fixes the missing underscore
 776 ;    in template non-type arguments of pointer type.
 777 ;
 778 ; 4: The version of the ABI that introduces unambiguous mangling of
 779 ;    vector types.  First selectable in G++ 4.5.
 780 ;
 781 ; 5: The version of the ABI that ignores attribute const/noreturn
 782 ;    in function pointer mangling, and corrects mangling of decltype and
 783 ;    function parameters used in other parameters and the return type.
 784 ;    First selectable in G++ 4.6.
 785 ;
 786 ; 6: The version of the ABI that doesn't promote scoped enums to int and
 787 ;    changes the mangling of template argument packs, const/static_cast,
 788 ;    prefix ++ and --, and a class scope function used as a template
 789 ;    argument.
 790 ;    First selectable in G++ 4.7.
 791 ;
 792 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
 793 ;    corrects the mangling of lambdas in default argument scope.
 794 ;    First selectable in G++ 4.8.
 795 ;
 796 ; 8: The version of the ABI that corrects the substitution behavior of
 797 ;    function types with function-cv-qualifiers.
 798 ;    First selectable in G++ 4.9.
 799 ;
 800 ; Additional positive integers will be assigned as new versions of
 801 ; the ABI become the default version of the ABI.
 802 fabi-version=
 803 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(2)
 804
 805 faggressive-loop-optimizations
 806 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
 807 Aggressively optimize loops using language constraints
 808
 809 falign-functions
 810 Common Report Var(align_functions,0) Optimization UInteger
 811 Align the start of functions
 812
 813 falign-functions=
 814 Common RejectNegative Joined UInteger Var(align_functions)
 815
 816 falign-jumps
 817 Common Report Var(align_jumps,0) Optimization UInteger
 818 Align labels which are only reached by jumping
 819
 820 falign-jumps=
 821 Common RejectNegative Joined UInteger Var(align_jumps)
 822
 823 falign-labels
 824 Common Report Var(align_labels,0) Optimization UInteger
 825 Align all labels
 826
 827 falign-labels=
 828 Common RejectNegative Joined UInteger Var(align_labels)
 829
 830 falign-loops
 831 Common Report Var(align_loops,0) Optimization UInteger
 832 Align the start of loops
 833
 834 falign-loops=
 835 Common RejectNegative Joined UInteger Var(align_loops)
 836
 837 fargument-alias
 838 Common Ignore
 839 Does nothing. Preserved for backward compatibility.
 840
 841 fargument-noalias
 842 Common Ignore
 843 Does nothing. Preserved for backward compatibility.
 844
 845 fargument-noalias-global
 846 Common Ignore
 847 Does nothing. Preserved for backward compatibility.
 848
 849 fargument-noalias-anything
 850 Common Ignore
 851 Does nothing. Preserved for backward compatibility.
 852
 853 fsanitize=address
 854 Common Report Var(flag_asan)
 855 Enable AddressSanitizer, a memory error detector
 856
 857 fsanitize=thread
 858 Common Report Var(flag_tsan)
 859 Enable ThreadSanitizer, a data race detector
 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
1007 Common Report Var(flag_devirtualize) Optimization
1008 Try to convert virtual calls to direct ones.
1009
1010 fdiagnostics-show-location=
1011 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1012 -fdiagnostics-show-location=[once|every-line]   How often to emit source location at the beginning of line-wrapped diagnostics
1013
1014 ; Required for these enum values.
1015 SourceInclude
1016 pretty-print.h
1017
1018 Enum
1019 Name(diagnostic_prefixing_rule) Type(int)
1020
1021 EnumValue
1022 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1023
1024 EnumValue
1025 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1026
1027 fdiagnostics-show-caret
1028 Common Var(flag_diagnostics_show_caret) Init(1)
1029 Show the source line with a caret indicating the column
1030
1031 fdiagnostics-show-option
1032 Common Var(flag_diagnostics_show_option) Init(1)
1033 Amend appropriate diagnostic messages with the command line option that controls them
1034
1035 fdisable-
1036 Common Joined RejectNegative Var(common_deferred_options) Defer
1037 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1038
1039 fenable-
1040 Common Joined RejectNegative Var(common_deferred_options) Defer
1041 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1042
1043 fdump-
1044 Common Joined RejectNegative Var(common_deferred_options) Defer
1045 -fdump-<type>   Dump various compiler internals to a file
1046
1047 fdump-final-insns
1048 Driver RejectNegative
1049
1050 fdump-final-insns=
1051 Common RejectNegative Joined Var(flag_dump_final_insns)
1052 -fdump-final-insns=filename     Dump to filename the insns at the end of translation
1053
1054 fdump-go-spec=
1055 Common RejectNegative Joined Var(flag_dump_go_spec)
1056 -fdump-go-spec=filename Write all declarations to file as Go code
1057
1058 fdump-noaddr
1059 Common Report Var(flag_dump_noaddr)
1060 Suppress output of addresses in debugging dumps
1061
1062 fdump-passes
1063 Common Var(flag_dump_passes) Init(0)
1064 Dump optimization passes
1065
1066 fdump-unnumbered
1067 Common Report Var(flag_dump_unnumbered)
1068 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1069
1070 fdump-unnumbered-links
1071 Common Report Var(flag_dump_unnumbered_links)
1072 Suppress output of previous and next insn numbers in debugging dumps
1073
1074 fdwarf2-cfi-asm
1075 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1076 Enable CFI tables via GAS assembler directives.
1077
1078 fearly-inlining
1079 Common Report Var(flag_early_inlining) Init(1) Optimization
1080 Perform early inlining
1081
1082 feliminate-dwarf2-dups
1083 Common Report Var(flag_eliminate_dwarf2_dups)
1084 Perform DWARF2 duplicate elimination
1085
1086 fipa-sra
1087 Common Report Var(flag_ipa_sra) Init(0) Optimization
1088 Perform interprocedural reduction of aggregates
1089
1090 feliminate-unused-debug-symbols
1091 Common Report Var(flag_debug_only_used_symbols)
1092 Perform unused type elimination in debug info
1093
1094 feliminate-unused-debug-types
1095 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1096 Perform unused type elimination in debug info
1097
1098 femit-class-debug-always
1099 Common Report Var(flag_emit_class_debug_always) Init(0)
1100 Do not suppress C++ class debug information.
1101
1102 fexceptions
1103 Common Report Var(flag_exceptions) Optimization
1104 Enable exception handling
1105
1106 fexpensive-optimizations
1107 Common Report Var(flag_expensive_optimizations) Optimization
1108 Perform a number of minor, expensive optimizations
1109
1110 fexcess-precision=
1111 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1112 -fexcess-precision=[fast|standard]      Specify handling of excess floating-point precision
1113
1114 Enum
1115 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1116
1117 EnumValue
1118 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1119
1120 EnumValue
1121 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1122
1123 ffast-math
1124 Common
1125
1126 ffat-lto-objects
1127 Common Var(flag_fat_lto_objects) Init(1)
1128 Output lto objects containing both the intermediate language and binary output.
1129
1130 ffinite-math-only
1131 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1132 Assume no NaNs or infinities are generated
1133
1134 ffixed-
1135 Common Joined RejectNegative Var(common_deferred_options) Defer
1136 -ffixed-<register>      Mark <register> as being unavailable to the compiler
1137
1138 ffloat-store
1139 Common Report Var(flag_float_store) Optimization
1140 Don't allocate floats and doubles in extended-precision registers
1141
1142 fforce-addr
1143 Common Ignore
1144 Does nothing.  Preserved for backward compatibility.
1145
1146 fforward-propagate
1147 Common Report Var(flag_forward_propagate) Optimization
1148 Perform a forward propagation pass on RTL
1149
1150 ffp-contract=
1151 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1152 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1153
1154 Enum
1155 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1156
1157 EnumValue
1158 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1159
1160 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1161 EnumValue
1162 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1163
1164 EnumValue
1165 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1166
1167 ; Nonzero means don't put addresses of constant functions in registers.
1168 ; Used for compiling the Unix kernel, where strange substitutions are
1169 ; done on the assembly output.
1170 ffunction-cse
1171 Common Report Var(flag_no_function_cse,0)
1172 Allow function addresses to be held in registers
1173
1174 ffunction-sections
1175 Common Report Var(flag_function_sections)
1176 Place each function into its own section
1177
1178 fgcse
1179 Common Report Var(flag_gcse) Optimization
1180 Perform global common subexpression elimination
1181
1182 fgcse-lm
1183 Common Report Var(flag_gcse_lm) Init(1) Optimization
1184 Perform enhanced load motion during global common subexpression elimination
1185
1186 fgcse-sm
1187 Common Report Var(flag_gcse_sm) Init(0) Optimization
1188 Perform store motion after global common subexpression elimination
1189
1190 fgcse-las
1191 Common Report Var(flag_gcse_las) Init(0) Optimization
1192 Perform redundant load after store elimination in global common subexpression
1193 elimination
1194
1195 fgcse-after-reload
1196 Common Report Var(flag_gcse_after_reload) Optimization
1197 Perform global common subexpression elimination after register allocation
1198 has finished
1199
1200 ; This option is not documented yet as its semantics will change.
1201 fgraphite
1202 Common Report Var(flag_graphite)
1203 Enable in and out of Graphite representation
1204
1205 fgraphite-identity
1206 Common Report Var(flag_graphite_identity) Optimization
1207 Enable Graphite Identity transformation
1208
1209 fhoist-adjacent-loads
1210 Common Report Var(flag_hoist_adjacent_loads) Optimization
1211 Enable hoisting adjacent loads to encourage generating conditional move
1212 instructions
1213
1214 floop-parallelize-all
1215 Common Report Var(flag_loop_parallelize_all) Optimization
1216 Mark all loops as parallel
1217
1218 floop-strip-mine
1219 Common Report Var(flag_loop_strip_mine) Optimization
1220 Enable Loop Strip Mining transformation
1221
1222 floop-interchange
1223 Common Report Var(flag_loop_interchange) Optimization
1224 Enable Loop Interchange transformation
1225
1226 floop-block
1227 Common Report Var(flag_loop_block) Optimization
1228 Enable Loop Blocking transformation
1229
1230 fgnu-tm
1231 Common Report Var(flag_tm)
1232 Enable support for GNU transactional memory
1233
1234 floop-flatten
1235 Common Ignore
1236 Does nothing. Preserved for backward compatibility.
1237
1238 floop-nest-optimize
1239 Common Report Var(flag_loop_optimize_isl) Optimization
1240 Enable the ISL based loop nest optimizer
1241
1242 fstrict-volatile-bitfields
1243 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1244 Force bitfield accesses to match their type width
1245
1246 fguess-branch-probability
1247 Common Report Var(flag_guess_branch_prob) Optimization
1248 Enable guessing of branch probabilities
1249
1250 ; Nonzero means ignore `#ident' directives.  0 means handle them.
1251 ; Generate position-independent code for executables if possible
1252 ; On SVR4 targets, it also controls whether or not to emit a
1253 ; string identifying the compiler.
1254 fident
1255 Common Report Var(flag_no_ident,0)
1256 Process #ident directives
1257
1258 fif-conversion
1259 Common Report Var(flag_if_conversion) Optimization
1260 Perform conversion of conditional jumps to branchless equivalents
1261
1262 fif-conversion2
1263 Common Report Var(flag_if_conversion2) Optimization
1264 Perform conversion of conditional jumps to conditional execution
1265
1266 fstack-reuse=
1267 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1268 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1269
1270 Enum
1271 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1272
1273 EnumValue
1274 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1275
1276 EnumValue
1277 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1278
1279 EnumValue
1280 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1281
1282 ftree-loop-if-convert
1283 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1284 Convert conditional jumps in innermost loops to branchless equivalents
1285
1286 ftree-loop-if-convert-stores
1287 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1288 Also if-convert conditional jumps containing memory writes
1289
1290 ; -finhibit-size-directive inhibits output of .size for ELF.
1291 ; This is used only for compiling crtstuff.c,
1292 ; and it may be extended to other effects
1293 ; needed for crtstuff.c on other systems.
1294 finhibit-size-directive
1295 Common Report Var(flag_inhibit_size_directive)
1296 Do not generate .size directives
1297
1298 findirect-inlining
1299 Common Report Var(flag_indirect_inlining)
1300 Perform indirect inlining
1301
1302 ; General flag to enable inlining.  Specifying -fno-inline will disable
1303 ; all inlining apart from always-inline functions.
1304 finline
1305 Common Report Var(flag_no_inline,0) Init(0) Optimization
1306 Enable inlining of function declared \"inline\", disabling disables all inlining
1307
1308 finline-small-functions
1309 Common Report Var(flag_inline_small_functions) Optimization
1310 Integrate functions into their callers when code size is known not to grow
1311
1312 finline-functions
1313 Common Report Var(flag_inline_functions) Optimization
1314 Integrate functions not declared \"inline\" into their callers when profitable
1315
1316 finline-functions-called-once
1317 Common Report Var(flag_inline_functions_called_once) Optimization
1318 Integrate functions only required by their single caller
1319
1320 finline-limit-
1321 Common RejectNegative Joined Alias(finline-limit=)
1322
1323 finline-limit=
1324 Common RejectNegative Joined UInteger
1325 -finline-limit=<number> Limit the size of inlined functions to <number>
1326
1327 finline-atomics
1328 Common Report Var(flag_inline_atomics) Init(1) Optimization
1329 Inline __atomic operations when a lock free instruction sequence is available.
1330
1331 finstrument-functions
1332 Common Report Var(flag_instrument_function_entry_exit)
1333 Instrument function entry and exit with profiling calls
1334
1335 finstrument-functions-exclude-function-list=
1336 Common RejectNegative Joined
1337 -finstrument-functions-exclude-function-list=name,...  Do not instrument listed functions
1338
1339 finstrument-functions-exclude-file-list=
1340 Common RejectNegative Joined
1341 -finstrument-functions-exclude-file-list=filename,...  Do not instrument functions listed in files
1342
1343 fipa-cp
1344 Common Report Var(flag_ipa_cp) Optimization
1345 Perform Interprocedural constant propagation
1346
1347 fipa-cp-clone
1348 Common Report Var(flag_ipa_cp_clone) Optimization
1349 Perform cloning to make Interprocedural constant propagation stronger
1350
1351 fipa-profile
1352 Common Report Var(flag_ipa_profile) Init(0) Optimization
1353 Perform interprocedural profile propagation
1354
1355 fipa-pta
1356 Common Report Var(flag_ipa_pta) Init(0) Optimization
1357 Perform interprocedural points-to analysis
1358
1359 fipa-pure-const
1360 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1361 Discover pure and const functions
1362
1363 fipa-reference
1364 Common Report Var(flag_ipa_reference) Init(0) Optimization
1365 Discover readonly and non addressable static variables
1366
1367 fipa-matrix-reorg
1368 Common Ignore
1369 Does nothing. Preserved for backward compatibility.
1370
1371 fipa-struct-reorg
1372 Common Ignore
1373 Does nothing. Preserved for backward compatibility.
1374
1375 fira-algorithm=
1376 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1377 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1378
1379 Enum
1380 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1381
1382 EnumValue
1383 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1384
1385 EnumValue
1386 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1387
1388 fira-region=
1389 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1390 -fira-region=[one|all|mixed] Set regions for IRA
1391
1392 Enum
1393 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1394
1395 EnumValue
1396 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1397
1398 EnumValue
1399 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1400
1401 EnumValue
1402 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1403
1404 fira-hoist-pressure
1405 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1406 Use IRA based register pressure calculation
1407 in RTL hoist optimizations.
1408
1409 fira-loop-pressure
1410 Common Report Var(flag_ira_loop_pressure)
1411 Use IRA based register pressure calculation
1412 in RTL loop optimizations.
1413
1414 fira-share-save-slots
1415 Common Report Var(flag_ira_share_save_slots) Init(1)
1416 Share slots for saving different hard registers.
1417
1418 fira-share-spill-slots
1419 Common Report Var(flag_ira_share_spill_slots) Init(1)
1420 Share stack slots for spilled pseudo-registers.
1421
1422 fira-verbose=
1423 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1424 -fira-verbose=<number>  Control IRA's level of diagnostic messages.
1425
1426 fivopts
1427 Common Report Var(flag_ivopts) Init(1) Optimization
1428 Optimize induction variables on trees
1429
1430 fjump-tables
1431 Common Var(flag_jump_tables) Init(1) Optimization
1432 Use jump tables for sufficiently large switch statements
1433
1434 fkeep-inline-functions
1435 Common Report Var(flag_keep_inline_functions)
1436 Generate code for functions even if they are fully inlined
1437
1438 fkeep-static-consts
1439 Common Report Var(flag_keep_static_consts) Init(1)
1440 Emit static const variables even if they are not used
1441
1442 fleading-underscore
1443 Common Report Var(flag_leading_underscore) Init(-1)
1444 Give external symbols a leading underscore
1445
1446 floop-optimize
1447 Common Ignore
1448 Does nothing.  Preserved for backward compatibility.
1449
1450 flto
1451 Common
1452 Enable link-time optimization.
1453
1454 flto=
1455 Common RejectNegative Joined Var(flag_lto)
1456 Link-time optimization with number of parallel jobs or jobserver.
1457
1458 flto-partition=1to1
1459 Common Var(flag_lto_partition_1to1)
1460 Partition symbols and vars at linktime based on object files they originate from
1461
1462 flto-partition=balanced
1463 Common Var(flag_lto_partition_balanced)
1464 Partition functions and vars at linktime into approximately same sized buckets
1465
1466 flto-partition=max
1467 Common Var(flag_lto_partition_max)
1468 Put every symbol into separate partition
1469
1470 flto-partition=none
1471 Common Var(flag_lto_partition_none)
1472 Disable partioning and streaming
1473
1474 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1475 flto-compression-level=
1476 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1477 -flto-compression-level=<number>        Use zlib compression level <number> for IL
1478
1479 flto-report
1480 Common Report Var(flag_lto_report) Init(0)
1481 Report various link-time optimization statistics
1482
1483 fmath-errno
1484 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1485 Set errno after built-in math functions
1486
1487 fmax-errors=
1488 Common Joined RejectNegative UInteger Var(flag_max_errors)
1489 -fmax-errors=<number>   Maximum number of errors to report
1490
1491 fmem-report
1492 Common Report Var(mem_report)
1493 Report on permanent memory allocation
1494
1495 fmem-report-wpa
1496 Common Report Var(mem_report_wpa)
1497 Report on permanent memory allocation in WPA only
1498
1499 ; This will attempt to merge constant section constants, if 1 only
1500 ; string constants and constants from constant pool, if 2 also constant
1501 ; variables.
1502 fmerge-all-constants
1503 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1504 Attempt to merge identical constants and constant variables
1505
1506 fmerge-constants
1507 Common Report Var(flag_merge_constants,1) Optimization
1508 Attempt to merge identical constants across compilation units
1509
1510 fmerge-debug-strings
1511 Common Report Var(flag_merge_debug_strings) Init(1)
1512 Attempt to merge identical debug strings across compilation units
1513
1514 fmessage-length=
1515 Common RejectNegative Joined UInteger
1516 -fmessage-length=<number>       Limit diagnostics to <number> characters per line.  0 suppresses line-wrapping
1517
1518 fmodulo-sched
1519 Common Report Var(flag_modulo_sched) Optimization
1520 Perform SMS based modulo scheduling before the first scheduling pass
1521
1522 fmodulo-sched-allow-regmoves
1523 Common Report Var(flag_modulo_sched_allow_regmoves)
1524 Perform SMS based modulo scheduling with register moves allowed
1525
1526 fmove-loop-invariants
1527 Common Report Var(flag_move_loop_invariants) Init(1) Optimization
1528 Move loop invariant computations out of loops
1529
1530 fdce
1531 Common Var(flag_dce) Init(1) Optimization
1532 Use the RTL dead code elimination pass
1533
1534 fdse
1535 Common Var(flag_dse) Init(1) Optimization
1536 Use the RTL dead store elimination pass
1537
1538 freschedule-modulo-scheduled-loops
1539 Common Report Var(flag_resched_modulo_sched) Optimization
1540 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1541
1542 fnon-call-exceptions
1543 Common Report Var(flag_non_call_exceptions) Optimization
1544 Support synchronous non-call exceptions
1545
1546 fomit-frame-pointer
1547 Common Report Var(flag_omit_frame_pointer) Optimization
1548 When possible do not generate stack frames
1549
1550 fopt-info
1551 Common Report Var(flag_opt_info) Optimization
1552 Enable all optimization info dumps on stderr
1553
1554 fopt-info-
1555 Common Joined RejectNegative Var(common_deferred_options) Defer
1556 -fopt-info[-<type>=filename]    Dump compiler optimization details
1557
1558 foptimize-register-move
1559 Common Report Var(flag_regmove) Optimization
1560 Do the full register move optimization pass
1561
1562 foptimize-sibling-calls
1563 Common Report Var(flag_optimize_sibling_calls) Optimization
1564 Optimize sibling and tail recursive calls
1565
1566 fpartial-inlining
1567 Common Report Var(flag_partial_inlining)
1568 Perform partial inlining
1569
1570 fpre-ipa-mem-report
1571 Common Report Var(pre_ipa_mem_report)
1572 Report on memory allocation before interprocedural optimization
1573
1574 fpost-ipa-mem-report
1575 Common Report Var(post_ipa_mem_report)
1576 Report on memory allocation before interprocedural optimization
1577
1578 fpack-struct
1579 Common Report Var(flag_pack_struct) Optimization
1580 Pack structure members together without holes
1581
1582 fpack-struct=
1583 Common RejectNegative Joined UInteger Optimization
1584 -fpack-struct=<number>  Set initial maximum structure member alignment
1585
1586 fpcc-struct-return
1587 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1588 Return small aggregates in memory, not registers
1589
1590 fpeel-loops
1591 Common Report Var(flag_peel_loops) Optimization
1592 Perform loop peeling
1593
1594 fpeephole
1595 Common Report Var(flag_no_peephole,0) Optimization
1596 Enable machine specific peephole optimizations
1597
1598 fpeephole2
1599 Common Report Var(flag_peephole2) Optimization
1600 Enable an RTL peephole pass before sched2
1601
1602 fPIC
1603 Common Report Var(flag_pic,2) Negative(fPIE)
1604 Generate position-independent code if possible (large mode)
1605
1606 fPIE
1607 Common Report Var(flag_pie,2) Negative(fpic)
1608 Generate position-independent code for executables if possible (large mode)
1609
1610 fpic
1611 Common Report Var(flag_pic,1) Negative(fpie)
1612 Generate position-independent code if possible (small mode)
1613
1614 fpie
1615 Common Report Var(flag_pie,1) Negative(fPIC)
1616 Generate position-independent code for executables if possible (small mode)
1617
1618 fplugin=
1619 Common Joined RejectNegative Var(common_deferred_options) Defer
1620 Specify a plugin to load
1621
1622 fplugin-arg-
1623 Common Joined RejectNegative Var(common_deferred_options) Defer
1624 -fplugin-arg-<name>-<key>[=<value>]     Specify argument <key>=<value> for plugin <name>
1625
1626 fpredictive-commoning
1627 Common Report Var(flag_predictive_commoning) Optimization
1628 Run predictive commoning optimization.
1629
1630 fprefetch-loop-arrays
1631 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1632 Generate prefetch instructions, if available, for arrays in loops
1633
1634 fprofile
1635 Common Report Var(profile_flag)
1636 Enable basic program profiling code
1637
1638 fprofile-arcs
1639 Common Report Var(profile_arc_flag)
1640 Insert arc-based program profiling code
1641
1642 fprofile-dir=
1643 Common Joined RejectNegative Var(profile_data_prefix)
1644 Set the top-level directory for storing the profile data.
1645 The default is 'pwd'.
1646
1647 fprofile-correction
1648 Common Report Var(flag_profile_correction)
1649 Enable correction of flow inconsistent profile data input
1650
1651 fprofile-generate
1652 Common
1653 Enable common options for generating profile info for profile feedback directed optimizations
1654
1655 fprofile-generate=
1656 Common Joined RejectNegative
1657 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1658
1659 fprofile-use
1660 Common Var(flag_profile_use)
1661 Enable common options for performing profile feedback directed optimizations
1662
1663 fprofile-use=
1664 Common Joined RejectNegative
1665 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1666
1667 fprofile-values
1668 Common Report Var(flag_profile_values)
1669 Insert code to profile values of expressions
1670
1671 fprofile-report
1672 Common Report Var(profile_report)
1673 Report on consistency of profile
1674
1675 frandom-seed
1676 Common Var(common_deferred_options) Defer
1677
1678 frandom-seed=
1679 Common Joined RejectNegative Var(common_deferred_options) Defer
1680 -frandom-seed=<string>  Make compile reproducible using <string>
1681
1682 ; This switch causes the command line that was used to create an
1683 ; object file to be recorded into the object file.  The exact format
1684 ; of this recording is target and binary file format dependent.
1685 ; It is related to the -fverbose-asm switch, but that switch only
1686 ; records information in the assembler output file as comments, so
1687 ; they never reach the object file.
1688 frecord-gcc-switches
1689 Common Report Var(flag_record_gcc_switches)
1690 Record gcc command line switches in the object file.
1691
1692 freg-struct-return
1693 Common Report Var(flag_pcc_struct_return,0) Optimization
1694 Return small aggregates in registers
1695
1696 fregmove
1697 Common Report Var(flag_regmove) Optimization
1698 Enables a register move optimization
1699
1700 frename-registers
1701 Common Report Var(flag_rename_registers) Init(2) Optimization
1702 Perform a register renaming optimization pass
1703
1704 freorder-blocks
1705 Common Report Var(flag_reorder_blocks) Optimization
1706 Reorder basic blocks to improve code placement
1707
1708 freorder-blocks-and-partition
1709 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1710 Reorder basic blocks and partition into hot and cold sections
1711
1712 freorder-functions
1713 Common Report Var(flag_reorder_functions) Optimization
1714 Reorder functions to improve code placement
1715
1716 frerun-cse-after-loop
1717 Common Report Var(flag_rerun_cse_after_loop) Optimization
1718 Add a common subexpression elimination pass after loop optimizations
1719
1720 frerun-loop-opt
1721 Common Ignore
1722 Does nothing.  Preserved for backward compatibility.
1723
1724 frounding-math
1725 Common Report Var(flag_rounding_math) Optimization SetByCombined
1726 Disable optimizations that assume default FP rounding behavior
1727
1728 fsched-interblock
1729 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1730 Enable scheduling across basic blocks
1731
1732 fsched-pressure
1733 Common Report Var(flag_sched_pressure) Init(0) Optimization
1734 Enable register pressure sensitive insn scheduling
1735
1736 fsched-spec
1737 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1738 Allow speculative motion of non-loads
1739
1740 fsched-spec-load
1741 Common Report Var(flag_schedule_speculative_load) Optimization
1742 Allow speculative motion of some loads
1743
1744 fsched-spec-load-dangerous
1745 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1746 Allow speculative motion of more loads
1747
1748 fsched-verbose=
1749 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1750 -fsched-verbose=<number>        Set the verbosity level of the scheduler
1751
1752 fsched2-use-superblocks
1753 Common Report Var(flag_sched2_use_superblocks) Optimization
1754 If scheduling post reload, do superblock scheduling
1755
1756 fsched2-use-traces
1757 Common Ignore
1758 Does nothing.  Preserved for backward compatibility.
1759
1760 fschedule-insns
1761 Common Report Var(flag_schedule_insns) Optimization
1762 Reschedule instructions before register allocation
1763
1764 fschedule-insns2
1765 Common Report Var(flag_schedule_insns_after_reload) Optimization
1766 Reschedule instructions after register allocation
1767
1768 ; This flag should be on when a target implements non-trivial
1769 ; scheduling hooks, maybe saving some information for its own sake.
1770 ; On IA64, for example, this is used for correct bundling.
1771 fselective-scheduling
1772 Common Report Var(flag_selective_scheduling) Optimization
1773 Schedule instructions using selective scheduling algorithm
1774
1775 fselective-scheduling2
1776 Common Report Var(flag_selective_scheduling2) Optimization
1777 Run selective scheduling after reload
1778
1779 fsel-sched-pipelining
1780 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1781 Perform software pipelining of inner loops during selective scheduling
1782
1783 fsel-sched-pipelining-outer-loops
1784 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1785 Perform software pipelining of outer loops during selective scheduling
1786
1787 fsel-sched-reschedule-pipelined
1788 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1789 Reschedule pipelined regions without pipelining
1790
1791 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1792 ; of stalled insns into the ready list.
1793 fsched-stalled-insns
1794 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1795 Allow premature scheduling of queued insns
1796
1797 fsched-stalled-insns=
1798 Common RejectNegative Joined UInteger
1799 -fsched-stalled-insns=<number>  Set number of queued insns that can be prematurely scheduled
1800
1801 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1802 ; be examined for a dependency on a stalled insn that is candidate for
1803 ; premature removal from the queue of stalled insns into the ready list (has
1804 ; an effect only if the flag 'sched_stalled_insns' is set).
1805 fsched-stalled-insns-dep
1806 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1807 Set dependence distance checking in premature scheduling of queued insns
1808
1809 fsched-stalled-insns-dep=
1810 Common RejectNegative Joined UInteger
1811 -fsched-stalled-insns-dep=<number>      Set dependence distance checking in premature scheduling of queued insns
1812
1813 fsched-group-heuristic
1814 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1815 Enable the group heuristic in the scheduler
1816
1817 fsched-critical-path-heuristic
1818 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1819 Enable the critical path heuristic in the scheduler
1820
1821 fsched-spec-insn-heuristic
1822 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1823 Enable the speculative instruction heuristic in the scheduler
1824
1825 fsched-rank-heuristic
1826 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1827 Enable the rank heuristic in the scheduler
1828
1829 fsched-last-insn-heuristic
1830 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1831 Enable the last instruction heuristic in the scheduler
1832
1833 fsched-dep-count-heuristic
1834 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1835 Enable the dependent count heuristic in the scheduler
1836
1837 fsection-anchors
1838 Common Report Var(flag_section_anchors) Optimization
1839 Access data in the same section from shared anchor points
1840
1841 fsee
1842 Common Ignore
1843 Does nothing.  Preserved for backward compatibility.
1844
1845 fzee
1846 Common Ignore
1847 Does nothing.  Preserved for backward compatibility.
1848
1849 free
1850 Common Report Var(flag_ree) Init(0)
1851 Turn on Redundant Extensions Elimination pass.
1852
1853 fshow-column
1854 Common Report Var(flag_show_column) Init(1)
1855 Show column numbers in diagnostics, when available.  Default on
1856
1857 fshrink-wrap
1858 Common Report Var(flag_shrink_wrap) Optimization
1859 Emit function prologues only before parts of the function that need it,
1860 rather than at the top of the function.
1861
1862 fsignaling-nans
1863 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1864 Disable optimizations observable by IEEE signaling NaNs
1865
1866 fsigned-zeros
1867 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1868 Disable floating point optimizations that ignore the IEEE signedness of zero
1869
1870 fsingle-precision-constant
1871 Common Report Var(flag_single_precision_constant) Optimization
1872 Convert floating point constants to single precision constants
1873
1874 fsplit-ivs-in-unroller
1875 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1876 Split lifetimes of induction variables when loops are unrolled
1877
1878 fsplit-stack
1879 Common Report Var(flag_split_stack) Init(-1)
1880 Generate discontiguous stack frames
1881
1882 fsplit-wide-types
1883 Common Report Var(flag_split_wide_types) Optimization
1884 Split wide types into independent registers
1885
1886 fvariable-expansion-in-unroller
1887 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1888 Apply variable expansion when loops are unrolled
1889
1890 fstack-check=
1891 Common Report RejectNegative Joined
1892 -fstack-check=[no|generic|specific]     Insert stack checking code into the program
1893
1894 fstack-check
1895 Common Alias(fstack-check=, specific, no)
1896 Insert stack checking code into the program.  Same as -fstack-check=specific
1897
1898 fstack-limit
1899 Common Var(common_deferred_options) Defer
1900
1901 fstack-limit-register=
1902 Common RejectNegative Joined Var(common_deferred_options) Defer
1903 -fstack-limit-register=<register>       Trap if the stack goes past <register>
1904
1905 fstack-limit-symbol=
1906 Common RejectNegative Joined Var(common_deferred_options) Defer
1907 -fstack-limit-symbol=<name>     Trap if the stack goes past symbol <name>
1908
1909 fstack-protector
1910 Common Report Var(flag_stack_protect, 1)
1911 Use propolice as a stack protection method
1912
1913 fstack-protector-all
1914 Common Report RejectNegative Var(flag_stack_protect, 2)
1915 Use a stack protection method for every function
1916
1917 fstack-usage
1918 Common RejectNegative Var(flag_stack_usage)
1919 Output stack usage information on a per-function basis
1920
1921 fstrength-reduce
1922 Common Ignore
1923 Does nothing.  Preserved for backward compatibility.
1924
1925 ; Nonzero if we should do (language-dependent) alias analysis.
1926 ; Typically, this analysis will assume that expressions of certain
1927 ; types do not alias expressions of certain other types.  Only used
1928 ; if alias analysis (in general) is enabled.
1929 fstrict-aliasing
1930 Common Report Var(flag_strict_aliasing) Optimization
1931 Assume strict aliasing rules apply
1932
1933 fstrict-overflow
1934 Common Report Var(flag_strict_overflow)
1935 Treat signed overflow as undefined
1936
1937 fsync-libcalls
1938 Common Report Var(flag_sync_libcalls) Init(1)
1939 Implement __atomic operations via libcalls to legacy __sync functions
1940
1941 fsyntax-only
1942 Common Report Var(flag_syntax_only)
1943 Check for syntax errors, then stop
1944
1945 ftest-coverage
1946 Common Report Var(flag_test_coverage)
1947 Create data files needed by \"gcov\"
1948
1949 fthread-jumps
1950 Common Report Var(flag_thread_jumps) Optimization
1951 Perform jump threading optimizations
1952
1953 ftime-report
1954 Common Report Var(time_report)
1955 Report the time taken by each compiler pass
1956
1957 ftls-model=
1958 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
1959 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec]      Set the default thread-local storage code generation model
1960
1961 Enum
1962 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
1963
1964 EnumValue
1965 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
1966
1967 EnumValue
1968 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
1969
1970 EnumValue
1971 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
1972
1973 EnumValue
1974 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
1975
1976 ftoplevel-reorder
1977 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
1978 Reorder top level functions, variables, and asms
1979
1980 ftracer
1981 Common Report Var(flag_tracer)
1982 Perform superblock formation via tail duplication
1983
1984 ; Zero means that floating-point math operations cannot generate a
1985 ; (user-visible) trap.  This is the case, for example, in nonstop
1986 ; IEEE 754 arithmetic.
1987 ftrapping-math
1988 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
1989 Assume floating-point operations can trap
1990
1991 ftrapv
1992 Common Report Var(flag_trapv) Optimization
1993 Trap for signed overflow in addition, subtraction and multiplication
1994
1995 ftree-ccp
1996 Common Report Var(flag_tree_ccp) Optimization
1997 Enable SSA-CCP optimization on trees
1998
1999 ftree-bit-ccp
2000 Common Report Var(flag_tree_bit_ccp) Optimization
2001 Enable SSA-BIT-CCP optimization on trees
2002
2003 ftree-store-ccp
2004 Common Ignore
2005 Does nothing.  Preserved for backward compatibility.
2006
2007 ftree-ch
2008 Common Report Var(flag_tree_ch) Optimization
2009 Enable loop header copying on trees
2010
2011 ftree-coalesce-inlined-vars
2012 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2013 Enable coalescing of copy-related user variables that are inlined
2014
2015 ftree-coalesce-vars
2016 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2017 Enable coalescing of all copy-related user variables
2018
2019 ftree-copyrename
2020 Common Report Var(flag_tree_copyrename) Optimization
2021 Replace SSA temporaries with better names in copies
2022
2023 ftree-copy-prop
2024 Common Report Var(flag_tree_copy_prop) Optimization
2025 Enable copy propagation on trees
2026
2027 ftree-store-copy-prop
2028 Common Ignore
2029 Does nothing.  Preserved for backward compatibility.
2030
2031 ftree-cselim
2032 Common Report Var(flag_tree_cselim) Init(2) Optimization
2033 Transform condition stores into unconditional ones
2034
2035 ftree-switch-conversion
2036 Common Report Var(flag_tree_switch_conversion) Optimization
2037 Perform conversions of switch initializations.
2038
2039 ftree-dce
2040 Common Report Var(flag_tree_dce) Optimization
2041 Enable SSA dead code elimination optimization on trees
2042
2043 ftree-dominator-opts
2044 Common Report Var(flag_tree_dom) Optimization
2045 Enable dominator optimizations
2046
2047 ftree-tail-merge
2048 Common Report Var(flag_tree_tail_merge) Optimization
2049 Enable tail merging on trees
2050
2051 ftree-dse
2052 Common Report Var(flag_tree_dse) Optimization
2053 Enable dead store elimination
2054
2055 ftree-forwprop
2056 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2057 Enable forward propagation on trees
2058
2059 ftree-fre
2060 Common Report Var(flag_tree_fre) Optimization
2061 Enable Full Redundancy Elimination (FRE) on trees
2062
2063 foptimize-strlen
2064 Common Report Var(flag_optimize_strlen) Optimization
2065 Enable string length optimizations on trees
2066
2067 ftree-loop-distribution
2068 Common Report Var(flag_tree_loop_distribution) Optimization
2069 Enable loop distribution on trees
2070
2071 ftree-loop-distribute-patterns
2072 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2073 Enable loop distribution for patterns transformed into a library call
2074
2075 ftree-loop-im
2076 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2077 Enable loop invariant motion on trees
2078
2079 ftree-loop-linear
2080 Common Alias(floop-interchange)
2081 Enable loop interchange transforms.  Same as -floop-interchange
2082
2083 ftree-loop-ivcanon
2084 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2085 Create canonical induction variables in loops
2086
2087 ftree-loop-optimize
2088 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2089 Enable loop optimizations on tree level
2090
2091 ftree-parallelize-loops=
2092 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2093 Enable automatic parallelization of loops
2094
2095 ftree-phiprop
2096 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2097 Enable hoisting loads from conditional pointers.
2098
2099 ftree-pre
2100 Common Report Var(flag_tree_pre) Optimization
2101 Enable SSA-PRE optimization on trees
2102
2103 ftree-partial-pre
2104 Common Report Var(flag_tree_partial_pre) Optimization
2105 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2106
2107 ftree-pta
2108 Common Report Var(flag_tree_pta) Init(1) Optimization
2109 Perform function-local points-to analysis on trees.
2110
2111 ftree-reassoc
2112 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2113 Enable reassociation on tree level
2114
2115 ftree-salias
2116 Common Ignore
2117 Does nothing.  Preserved for backward compatibility.
2118
2119 ftree-sink
2120 Common Report Var(flag_tree_sink) Optimization
2121 Enable SSA code sinking on trees
2122
2123 ftree-slsr
2124 Common Report Var(flag_tree_slsr) Optimization
2125 Perform straight-line strength reduction
2126
2127 ftree-sra
2128 Common Report Var(flag_tree_sra) Optimization
2129 Perform scalar replacement of aggregates
2130
2131 ftree-ter
2132 Common Report Var(flag_tree_ter) Optimization
2133 Replace temporary expressions in the SSA->normal pass
2134
2135 ftree-lrs
2136 Common Report Var(flag_tree_live_range_split) Optimization
2137 Perform live range splitting during the SSA->normal pass
2138
2139 ftree-vrp
2140 Common Report Var(flag_tree_vrp) Init(0) Optimization
2141 Perform Value Range Propagation on trees
2142
2143 funit-at-a-time
2144 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2145 Compile whole compilation unit at a time
2146
2147 funroll-loops
2148 Common Report Var(flag_unroll_loops) Optimization
2149 Perform loop unrolling when iteration count is known
2150
2151 funroll-all-loops
2152 Common Report Var(flag_unroll_all_loops) Optimization
2153 Perform loop unrolling for all loops
2154
2155 ; Nonzero means that loop optimizer may assume that the induction variables
2156 ; that control loops do not overflow and that the loops with nontrivial
2157 ; exit condition are not infinite
2158 funsafe-loop-optimizations
2159 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2160 Allow loop optimizations to assume that the loops behave in normal way
2161
2162 fassociative-math
2163 Common Report Var(flag_associative_math) SetByCombined
2164 Allow optimization for floating-point arithmetic which may change the
2165 result of the operation due to rounding.
2166
2167 freciprocal-math
2168 Common Report Var(flag_reciprocal_math) SetByCombined
2169 Same as -fassociative-math for expressions which include division.
2170
2171 ; Nonzero means that unsafe floating-point math optimizations are allowed
2172 ; for the sake of speed.  IEEE compliance is not guaranteed, and operations
2173 ; are allowed to assume that their arguments and results are "normal"
2174 ; (e.g., nonnegative for SQRT).
2175 funsafe-math-optimizations
2176 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2177 Allow math optimizations that may violate IEEE or ISO standards
2178
2179 funswitch-loops
2180 Common Report Var(flag_unswitch_loops) Optimization
2181 Perform loop unswitching
2182
2183 funwind-tables
2184 Common Report Var(flag_unwind_tables) Optimization
2185 Just generate unwind tables for exception handling
2186
2187 fuse-ld=bfd
2188 Common Negative(fuse-ld=gold)
2189 Use the bfd linker instead of the default linker
2190
2191 fuse-ld=gold
2192 Common Negative(fuse-ld=bfd)
2193 Use the gold linker instead of the default linker
2194
2195 fuse-linker-plugin
2196 Common Undocumented
2197
2198 ; Positive if we should track variables, negative if we should run
2199 ; the var-tracking pass only to discard debug annotations, zero if
2200 ; we're not to run it.  When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2201 ; will be set according to optimize, debug_info_level and debug_hooks
2202 ; in process_options ().
2203 fvar-tracking
2204 Common Report Var(flag_var_tracking) Init(2) Optimization
2205 Perform variable tracking
2206
2207 ; Positive if we should track variables at assignments, negative if
2208 ; we should run the var-tracking pass only to discard debug
2209 ; annotations.  When flag_var_tracking_assignments ==
2210 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2211 fvar-tracking-assignments
2212 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2213 Perform variable tracking by annotating assignments
2214
2215 ; Nonzero if we should toggle flag_var_tracking_assignments after
2216 ; processing options and computing its default.  */
2217 fvar-tracking-assignments-toggle
2218 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2219 Toggle -fvar-tracking-assignments
2220
2221 ; Positive if we should track uninitialized variables, negative if
2222 ; we should run the var-tracking pass only to discard debug
2223 ; annotations.  When flag_var_tracking_uninit == AUTODETECT_VALUE it
2224 ; will be set according to flag_var_tracking.
2225 fvar-tracking-uninit
2226 Common Report Var(flag_var_tracking_uninit) Optimization
2227 Perform variable tracking and also tag variables that are uninitialized
2228
2229 ftree-vectorize
2230 Common Report Var(flag_tree_vectorize) Optimization
2231 Enable loop vectorization on trees
2232
2233 ftree-vectorizer-verbose=
2234 Common RejectNegative Joined UInteger Var(common_deferred_options) Defer
2235 -ftree-vectorizer-verbose=<number>      This switch is deprecated. Use -fopt-info instead.
2236
2237 ftree-slp-vectorize
2238 Common Report Var(flag_tree_slp_vectorize) Init(2) Optimization
2239 Enable basic block vectorization (SLP) on trees
2240
2241 fvect-cost-model
2242 Common Report Var(flag_vect_cost_model) Optimization
2243 Enable use of cost model in vectorization
2244
2245 ftree-vect-loop-version
2246 Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization
2247 Enable loop versioning when doing loop vectorization on trees
2248
2249 ftree-scev-cprop
2250 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2251 Enable copy propagation of scalar-evolution information.
2252
2253 ; -fverbose-asm causes extra commentary information to be produced in
2254 ; the generated assembly code (to make it more readable).  This option
2255 ; is generally only of use to those who actually need to read the
2256 ; generated assembly code (perhaps while debugging the compiler itself).
2257 ; -fno-verbose-asm, the default, causes the extra information
2258 ; to not be added and is useful when comparing two assembler files.
2259 fverbose-asm
2260 Common Report Var(flag_verbose_asm)
2261 Add extra commentary to assembler output
2262
2263 fvisibility=
2264 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2265 -fvisibility=[default|internal|hidden|protected]        Set the default symbol visibility
2266
2267 Enum
2268 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2269
2270 EnumValue
2271 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2272
2273 EnumValue
2274 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2275
2276 EnumValue
2277 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2278
2279 EnumValue
2280 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2281
2282 fvpt
2283 Common Report Var(flag_value_profile_transformations) Optimization
2284 Use expression value profiles in optimizations
2285
2286 fweb
2287 Common Report Var(flag_web) Init(2) Optimization
2288 Construct webs and split unrelated uses of single variable
2289
2290 ftree-builtin-call-dce
2291 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2292 Enable conditional dead code elimination for builtin calls
2293
2294 fwhole-program
2295 Common Report Var(flag_whole_program) Init(0) Optimization
2296 Perform whole program optimizations
2297
2298 fwrapv
2299 Common Report Var(flag_wrapv) Optimization
2300 Assume signed arithmetic overflow wraps around
2301
2302 fzero-initialized-in-bss
2303 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2304 Put zero initialized data in the bss section
2305
2306 g
2307 Common JoinedOrMissing
2308 Generate debug information in default format
2309
2310 gcoff
2311 Common JoinedOrMissing Negative(gdwarf)
2312 Generate debug information in COFF format
2313
2314 gdwarf
2315 Common JoinedOrMissing Negative(gdwarf-)
2316 Generate debug information in default version of DWARF format
2317
2318 gdwarf-
2319 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2320 Generate debug information in DWARF v2 (or later) format
2321
2322 ggdb
2323 Common JoinedOrMissing
2324 Generate debug information in default extended format
2325
2326 gno-pubnames
2327 Common RejectNegative Var(debug_generate_pub_sections, 0) Init(-1)
2328 Don't generate DWARF pubnames and pubtypes sections.
2329
2330 gpubnames
2331 Common RejectNegative Var(debug_generate_pub_sections, 1)
2332 Generate DWARF pubnames and pubtypes sections.
2333
2334 gno-record-gcc-switches
2335 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2336 Don't record gcc command line switches in DWARF DW_AT_producer.
2337
2338 grecord-gcc-switches
2339 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2340 Record gcc command line switches in DWARF DW_AT_producer.
2341
2342 gno-split-dwarf
2343 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2344 Don't generate debug information in separate .dwo files
2345
2346 gsplit-dwarf
2347 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2348 Generate debug information in separate .dwo files
2349
2350 gstabs
2351 Common JoinedOrMissing Negative(gstabs+)
2352 Generate debug information in STABS format
2353
2354 gstabs+
2355 Common JoinedOrMissing Negative(gvms)
2356 Generate debug information in extended STABS format
2357
2358 gno-strict-dwarf
2359 Common RejectNegative Var(dwarf_strict,0) Init(0)
2360 Emit DWARF additions beyond selected version
2361
2362 gstrict-dwarf
2363 Common Report RejectNegative Var(dwarf_strict,1)
2364 Don't emit DWARF additions beyond selected version
2365
2366 gtoggle
2367 Common Report Var(flag_gtoggle)
2368 Toggle debug information generation
2369
2370 gvms
2371 Common JoinedOrMissing Negative(gxcoff)
2372 Generate debug information in VMS format
2373
2374 gxcoff
2375 Common JoinedOrMissing Negative(gxcoff+)
2376 Generate debug information in XCOFF format
2377
2378 gxcoff+
2379 Common JoinedOrMissing Negative(gcoff)
2380 Generate debug information in extended XCOFF format
2381
2382 h
2383 Driver Joined Separate
2384
2385 iplugindir=
2386 Common Joined Var(plugindir_string) Init(0)
2387 -iplugindir=<dir>       Set <dir> to be the default plugin directory
2388
2389 imultiarch
2390 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2391 -imultiarch <dir>       Set <dir> to be the multiarch include subdirectory
2392
2393 l
2394 Driver Joined Separate
2395
2396 n
2397 Driver
2398
2399 no-canonical-prefixes
2400 Driver
2401
2402 nodefaultlibs
2403 Driver
2404
2405 nostartfiles
2406 Driver
2407
2408 nostdlib
2409 Driver
2410
2411 o
2412 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2413 -o <file>       Place output into <file>
2414
2415 p
2416 Common Var(profile_flag)
2417 Enable function profiling
2418
2419 pass-exit-codes
2420 Driver Var(pass_exit_codes)
2421
2422 pedantic
2423 Common Alias(Wpedantic)
2424
2425 pedantic-errors
2426 Common Var(flag_pedantic_errors)
2427 Like -pedantic but issue them as errors
2428
2429 pg
2430 Driver
2431
2432 pipe
2433 Driver Var(use_pipes)
2434
2435 print-file-name=
2436 Driver JoinedOrMissing Var(print_file_name)
2437
2438 print-libgcc-file-name
2439 Driver
2440
2441 print-multi-directory
2442 Driver Var(print_multi_directory)
2443
2444 print-multi-lib
2445 Driver Var(print_multi_lib)
2446
2447 print-multi-os-directory
2448 Driver Var(print_multi_os_directory)
2449
2450 print-multiarch
2451 Driver Var(print_multiarch)
2452
2453 print-prog-name=
2454 Driver JoinedOrMissing Var(print_prog_name)
2455
2456 print-search-dirs
2457 Driver Var(print_search_dirs)
2458
2459 print-sysroot
2460 Driver Var(print_sysroot)
2461
2462 print-sysroot-headers-suffix
2463 Driver Var(print_sysroot_headers_suffix)
2464
2465 quiet
2466 Common Var(quiet_flag) RejectDriver
2467 Do not display functions compiled or elapsed time
2468
2469 r
2470 Driver
2471
2472 s
2473 Driver
2474
2475 save-temps
2476 Driver
2477
2478 save-temps=
2479 Driver Joined
2480
2481 t
2482 Driver
2483
2484 time
2485 Driver Var(report_times)
2486
2487 time=
2488 Driver JoinedOrMissing
2489
2490 u
2491 Driver Joined Separate
2492
2493 undef
2494 Driver
2495 ; C option, but driver must not handle as "-u ndef".
2496
2497 v
2498 Common Driver Var(verbose_flag)
2499 Enable verbose output
2500
2501 version
2502 Common Var(version_flag) RejectDriver
2503 Display the compiler's version
2504
2505 w
2506 Common Var(inhibit_warnings)
2507 Suppress warnings
2508
2509 wrapper
2510 Driver Separate Var(wrapper_string)
2511
2512 x
2513 Driver Joined Separate
2514
2515 shared
2516 Driver RejectNegative Negative(pie)
2517 Create a shared library
2518
2519 shared-libgcc
2520 Driver
2521
2522 specs
2523 Driver Separate Alias(specs=)
2524
2525 specs=
2526 Driver Joined
2527
2528 static
2529 Driver
2530
2531 static-libgcc
2532 Driver
2533
2534 static-libgfortran
2535 Driver
2536 ; Documented for Fortran, but always accepted by driver.
2537
2538 static-libstdc++
2539 Driver
2540
2541 static-libgo
2542 Driver
2543 ; Documented for Go, but always accepted by driver.
2544
2545 static-libasan
2546 Driver
2547
2548 static-libtsan
2549 Driver
2550
2551 symbolic
2552 Driver
2553
2554 pie
2555 Driver RejectNegative Negative(shared)
2556 Create a position independent executable
2557
2558 z
2559 Driver Joined Separate
2560
2561 ; This comment is to ensure we retain the blank line above.