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-color
1032 Common Alias(fdiagnostics-color=,always,never)
1033 ;
1034
1035 fdiagnostics-color=
1036 Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1037 -fdiagnostics-color=[never|always|auto] Colorize diagnostics
1038
1039 ; Required for these enum values.
1040 SourceInclude
1041 diagnostic-color.h
1042
1043 Enum
1044 Name(diagnostic_color_rule) Type(int)
1045
1046 EnumValue
1047 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1048
1049 EnumValue
1050 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1051
1052 EnumValue
1053 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1054
1055 fdiagnostics-show-option
1056 Common Var(flag_diagnostics_show_option) Init(1)
1057 Amend appropriate diagnostic messages with the command line option that controls them
1058
1059 fdisable-
1060 Common Joined RejectNegative Var(common_deferred_options) Defer
1061 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1062
1063 fenable-
1064 Common Joined RejectNegative Var(common_deferred_options) Defer
1065 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1066
1067 fdump-
1068 Common Joined RejectNegative Var(common_deferred_options) Defer
1069 -fdump-<type>   Dump various compiler internals to a file
1070
1071 fdump-final-insns
1072 Driver RejectNegative
1073
1074 fdump-final-insns=
1075 Common RejectNegative Joined Var(flag_dump_final_insns)
1076 -fdump-final-insns=filename     Dump to filename the insns at the end of translation
1077
1078 fdump-go-spec=
1079 Common RejectNegative Joined Var(flag_dump_go_spec)
1080 -fdump-go-spec=filename Write all declarations to file as Go code
1081
1082 fdump-noaddr
1083 Common Report Var(flag_dump_noaddr)
1084 Suppress output of addresses in debugging dumps
1085
1086 fdump-passes
1087 Common Var(flag_dump_passes) Init(0)
1088 Dump optimization passes
1089
1090 fdump-unnumbered
1091 Common Report Var(flag_dump_unnumbered)
1092 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1093
1094 fdump-unnumbered-links
1095 Common Report Var(flag_dump_unnumbered_links)
1096 Suppress output of previous and next insn numbers in debugging dumps
1097
1098 fdwarf2-cfi-asm
1099 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1100 Enable CFI tables via GAS assembler directives.
1101
1102 fearly-inlining
1103 Common Report Var(flag_early_inlining) Init(1) Optimization
1104 Perform early inlining
1105
1106 feliminate-dwarf2-dups
1107 Common Report Var(flag_eliminate_dwarf2_dups)
1108 Perform DWARF2 duplicate elimination
1109
1110 fipa-sra
1111 Common Report Var(flag_ipa_sra) Init(0) Optimization
1112 Perform interprocedural reduction of aggregates
1113
1114 feliminate-unused-debug-symbols
1115 Common Report Var(flag_debug_only_used_symbols)
1116 Perform unused type elimination in debug info
1117
1118 feliminate-unused-debug-types
1119 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1120 Perform unused type elimination in debug info
1121
1122 femit-class-debug-always
1123 Common Report Var(flag_emit_class_debug_always) Init(0)
1124 Do not suppress C++ class debug information.
1125
1126 fexceptions
1127 Common Report Var(flag_exceptions) Optimization
1128 Enable exception handling
1129
1130 fexpensive-optimizations
1131 Common Report Var(flag_expensive_optimizations) Optimization
1132 Perform a number of minor, expensive optimizations
1133
1134 fexcess-precision=
1135 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1136 -fexcess-precision=[fast|standard]      Specify handling of excess floating-point precision
1137
1138 Enum
1139 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1140
1141 EnumValue
1142 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1143
1144 EnumValue
1145 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1146
1147 ffast-math
1148 Common
1149
1150 ffat-lto-objects
1151 Common Var(flag_fat_lto_objects) Init(1)
1152 Output lto objects containing both the intermediate language and binary output.
1153
1154 ffinite-math-only
1155 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1156 Assume no NaNs or infinities are generated
1157
1158 ffixed-
1159 Common Joined RejectNegative Var(common_deferred_options) Defer
1160 -ffixed-<register>      Mark <register> as being unavailable to the compiler
1161
1162 ffloat-store
1163 Common Report Var(flag_float_store) Optimization
1164 Don't allocate floats and doubles in extended-precision registers
1165
1166 fforce-addr
1167 Common Ignore
1168 Does nothing.  Preserved for backward compatibility.
1169
1170 fforward-propagate
1171 Common Report Var(flag_forward_propagate) Optimization
1172 Perform a forward propagation pass on RTL
1173
1174 ffp-contract=
1175 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1176 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1177
1178 Enum
1179 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1180
1181 EnumValue
1182 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1183
1184 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1185 EnumValue
1186 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1187
1188 EnumValue
1189 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1190
1191 ; Nonzero means don't put addresses of constant functions in registers.
1192 ; Used for compiling the Unix kernel, where strange substitutions are
1193 ; done on the assembly output.
1194 ffunction-cse
1195 Common Report Var(flag_no_function_cse,0)
1196 Allow function addresses to be held in registers
1197
1198 ffunction-sections
1199 Common Report Var(flag_function_sections)
1200 Place each function into its own section
1201
1202 fgcse
1203 Common Report Var(flag_gcse) Optimization
1204 Perform global common subexpression elimination
1205
1206 fgcse-lm
1207 Common Report Var(flag_gcse_lm) Init(1) Optimization
1208 Perform enhanced load motion during global common subexpression elimination
1209
1210 fgcse-sm
1211 Common Report Var(flag_gcse_sm) Init(0) Optimization
1212 Perform store motion after global common subexpression elimination
1213
1214 fgcse-las
1215 Common Report Var(flag_gcse_las) Init(0) Optimization
1216 Perform redundant load after store elimination in global common subexpression
1217 elimination
1218
1219 fgcse-after-reload
1220 Common Report Var(flag_gcse_after_reload) Optimization
1221 Perform global common subexpression elimination after register allocation
1222 has finished
1223
1224 ; This option is not documented yet as its semantics will change.
1225 fgraphite
1226 Common Report Var(flag_graphite)
1227 Enable in and out of Graphite representation
1228
1229 fgraphite-identity
1230 Common Report Var(flag_graphite_identity) Optimization
1231 Enable Graphite Identity transformation
1232
1233 fhoist-adjacent-loads
1234 Common Report Var(flag_hoist_adjacent_loads) Optimization
1235 Enable hoisting adjacent loads to encourage generating conditional move
1236 instructions
1237
1238 floop-parallelize-all
1239 Common Report Var(flag_loop_parallelize_all) Optimization
1240 Mark all loops as parallel
1241
1242 floop-strip-mine
1243 Common Report Var(flag_loop_strip_mine) Optimization
1244 Enable Loop Strip Mining transformation
1245
1246 floop-interchange
1247 Common Report Var(flag_loop_interchange) Optimization
1248 Enable Loop Interchange transformation
1249
1250 floop-block
1251 Common Report Var(flag_loop_block) Optimization
1252 Enable Loop Blocking transformation
1253
1254 fgnu-tm
1255 Common Report Var(flag_tm)
1256 Enable support for GNU transactional memory
1257
1258 floop-flatten
1259 Common Ignore
1260 Does nothing. Preserved for backward compatibility.
1261
1262 floop-nest-optimize
1263 Common Report Var(flag_loop_optimize_isl) Optimization
1264 Enable the ISL based loop nest optimizer
1265
1266 fstrict-volatile-bitfields
1267 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1268 Force bitfield accesses to match their type width
1269
1270 fguess-branch-probability
1271 Common Report Var(flag_guess_branch_prob) Optimization
1272 Enable guessing of branch probabilities
1273
1274 ; Nonzero means ignore `#ident' directives.  0 means handle them.
1275 ; Generate position-independent code for executables if possible
1276 ; On SVR4 targets, it also controls whether or not to emit a
1277 ; string identifying the compiler.
1278 fident
1279 Common Report Var(flag_no_ident,0)
1280 Process #ident directives
1281
1282 fif-conversion
1283 Common Report Var(flag_if_conversion) Optimization
1284 Perform conversion of conditional jumps to branchless equivalents
1285
1286 fif-conversion2
1287 Common Report Var(flag_if_conversion2) Optimization
1288 Perform conversion of conditional jumps to conditional execution
1289
1290 fstack-reuse=
1291 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1292 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1293
1294 Enum
1295 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1296
1297 EnumValue
1298 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1299
1300 EnumValue
1301 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1302
1303 EnumValue
1304 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1305
1306 ftree-loop-if-convert
1307 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1308 Convert conditional jumps in innermost loops to branchless equivalents
1309
1310 ftree-loop-if-convert-stores
1311 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1312 Also if-convert conditional jumps containing memory writes
1313
1314 ; -finhibit-size-directive inhibits output of .size for ELF.
1315 ; This is used only for compiling crtstuff.c,
1316 ; and it may be extended to other effects
1317 ; needed for crtstuff.c on other systems.
1318 finhibit-size-directive
1319 Common Report Var(flag_inhibit_size_directive)
1320 Do not generate .size directives
1321
1322 findirect-inlining
1323 Common Report Var(flag_indirect_inlining)
1324 Perform indirect inlining
1325
1326 ; General flag to enable inlining.  Specifying -fno-inline will disable
1327 ; all inlining apart from always-inline functions.
1328 finline
1329 Common Report Var(flag_no_inline,0) Init(0) Optimization
1330 Enable inlining of function declared \"inline\", disabling disables all inlining
1331
1332 finline-small-functions
1333 Common Report Var(flag_inline_small_functions) Optimization
1334 Integrate functions into their callers when code size is known not to grow
1335
1336 finline-functions
1337 Common Report Var(flag_inline_functions) Optimization
1338 Integrate functions not declared \"inline\" into their callers when profitable
1339
1340 finline-functions-called-once
1341 Common Report Var(flag_inline_functions_called_once) Optimization
1342 Integrate functions only required by their single caller
1343
1344 finline-limit-
1345 Common RejectNegative Joined Alias(finline-limit=)
1346
1347 finline-limit=
1348 Common RejectNegative Joined UInteger
1349 -finline-limit=<number> Limit the size of inlined functions to <number>
1350
1351 finline-atomics
1352 Common Report Var(flag_inline_atomics) Init(1) Optimization
1353 Inline __atomic operations when a lock free instruction sequence is available.
1354
1355 finstrument-functions
1356 Common Report Var(flag_instrument_function_entry_exit)
1357 Instrument function entry and exit with profiling calls
1358
1359 finstrument-functions-exclude-function-list=
1360 Common RejectNegative Joined
1361 -finstrument-functions-exclude-function-list=name,...  Do not instrument listed functions
1362
1363 finstrument-functions-exclude-file-list=
1364 Common RejectNegative Joined
1365 -finstrument-functions-exclude-file-list=filename,...  Do not instrument functions listed in files
1366
1367 fipa-cp
1368 Common Report Var(flag_ipa_cp) Optimization
1369 Perform Interprocedural constant propagation
1370
1371 fipa-cp-clone
1372 Common Report Var(flag_ipa_cp_clone) Optimization
1373 Perform cloning to make Interprocedural constant propagation stronger
1374
1375 fipa-profile
1376 Common Report Var(flag_ipa_profile) Init(0) Optimization
1377 Perform interprocedural profile propagation
1378
1379 fipa-pta
1380 Common Report Var(flag_ipa_pta) Init(0) Optimization
1381 Perform interprocedural points-to analysis
1382
1383 fipa-pure-const
1384 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1385 Discover pure and const functions
1386
1387 fipa-reference
1388 Common Report Var(flag_ipa_reference) Init(0) Optimization
1389 Discover readonly and non addressable static variables
1390
1391 fipa-matrix-reorg
1392 Common Ignore
1393 Does nothing. Preserved for backward compatibility.
1394
1395 fipa-struct-reorg
1396 Common Ignore
1397 Does nothing. Preserved for backward compatibility.
1398
1399 fira-algorithm=
1400 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1401 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1402
1403 Enum
1404 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1405
1406 EnumValue
1407 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1408
1409 EnumValue
1410 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1411
1412 fira-region=
1413 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1414 -fira-region=[one|all|mixed] Set regions for IRA
1415
1416 Enum
1417 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1418
1419 EnumValue
1420 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1421
1422 EnumValue
1423 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1424
1425 EnumValue
1426 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1427
1428 fira-hoist-pressure
1429 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1430 Use IRA based register pressure calculation
1431 in RTL hoist optimizations.
1432
1433 fira-loop-pressure
1434 Common Report Var(flag_ira_loop_pressure)
1435 Use IRA based register pressure calculation
1436 in RTL loop optimizations.
1437
1438 fira-share-save-slots
1439 Common Report Var(flag_ira_share_save_slots) Init(1)
1440 Share slots for saving different hard registers.
1441
1442 fira-share-spill-slots
1443 Common Report Var(flag_ira_share_spill_slots) Init(1)
1444 Share stack slots for spilled pseudo-registers.
1445
1446 fira-verbose=
1447 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1448 -fira-verbose=<number>  Control IRA's level of diagnostic messages.
1449
1450 fivopts
1451 Common Report Var(flag_ivopts) Init(1) Optimization
1452 Optimize induction variables on trees
1453
1454 fjump-tables
1455 Common Var(flag_jump_tables) Init(1) Optimization
1456 Use jump tables for sufficiently large switch statements
1457
1458 fkeep-inline-functions
1459 Common Report Var(flag_keep_inline_functions)
1460 Generate code for functions even if they are fully inlined
1461
1462 fkeep-static-consts
1463 Common Report Var(flag_keep_static_consts) Init(1)
1464 Emit static const variables even if they are not used
1465
1466 fleading-underscore
1467 Common Report Var(flag_leading_underscore) Init(-1)
1468 Give external symbols a leading underscore
1469
1470 floop-optimize
1471 Common Ignore
1472 Does nothing.  Preserved for backward compatibility.
1473
1474 flto
1475 Common
1476 Enable link-time optimization.
1477
1478 flto=
1479 Common RejectNegative Joined Var(flag_lto)
1480 Link-time optimization with number of parallel jobs or jobserver.
1481
1482 flto-partition=1to1
1483 Common Var(flag_lto_partition_1to1)
1484 Partition symbols and vars at linktime based on object files they originate from
1485
1486 flto-partition=balanced
1487 Common Var(flag_lto_partition_balanced)
1488 Partition functions and vars at linktime into approximately same sized buckets
1489
1490 flto-partition=max
1491 Common Var(flag_lto_partition_max)
1492 Put every symbol into separate partition
1493
1494 flto-partition=none
1495 Common Var(flag_lto_partition_none)
1496 Disable partioning and streaming
1497
1498 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1499 flto-compression-level=
1500 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1501 -flto-compression-level=<number>        Use zlib compression level <number> for IL
1502
1503 flto-report
1504 Common Report Var(flag_lto_report) Init(0)
1505 Report various link-time optimization statistics
1506
1507 flto-report-wpa
1508 Common Report Var(flag_lto_report_wpa) Init(0)
1509 Report various link-time optimization statistics for WPA only
1510
1511 fmath-errno
1512 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1513 Set errno after built-in math functions
1514
1515 fmax-errors=
1516 Common Joined RejectNegative UInteger Var(flag_max_errors)
1517 -fmax-errors=<number>   Maximum number of errors to report
1518
1519 fmem-report
1520 Common Report Var(mem_report)
1521 Report on permanent memory allocation
1522
1523 fmem-report-wpa
1524 Common Report Var(mem_report_wpa)
1525 Report on permanent memory allocation in WPA only
1526
1527 ; This will attempt to merge constant section constants, if 1 only
1528 ; string constants and constants from constant pool, if 2 also constant
1529 ; variables.
1530 fmerge-all-constants
1531 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1532 Attempt to merge identical constants and constant variables
1533
1534 fmerge-constants
1535 Common Report Var(flag_merge_constants,1) Optimization
1536 Attempt to merge identical constants across compilation units
1537
1538 fmerge-debug-strings
1539 Common Report Var(flag_merge_debug_strings) Init(1)
1540 Attempt to merge identical debug strings across compilation units
1541
1542 fmessage-length=
1543 Common RejectNegative Joined UInteger
1544 -fmessage-length=<number>       Limit diagnostics to <number> characters per line.  0 suppresses line-wrapping
1545
1546 fmodulo-sched
1547 Common Report Var(flag_modulo_sched) Optimization
1548 Perform SMS based modulo scheduling before the first scheduling pass
1549
1550 fmodulo-sched-allow-regmoves
1551 Common Report Var(flag_modulo_sched_allow_regmoves)
1552 Perform SMS based modulo scheduling with register moves allowed
1553
1554 fmove-loop-invariants
1555 Common Report Var(flag_move_loop_invariants) Init(1) Optimization
1556 Move loop invariant computations out of loops
1557
1558 fdce
1559 Common Var(flag_dce) Init(1) Optimization
1560 Use the RTL dead code elimination pass
1561
1562 fdse
1563 Common Var(flag_dse) Init(1) Optimization
1564 Use the RTL dead store elimination pass
1565
1566 freschedule-modulo-scheduled-loops
1567 Common Report Var(flag_resched_modulo_sched) Optimization
1568 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1569
1570 fnon-call-exceptions
1571 Common Report Var(flag_non_call_exceptions) Optimization
1572 Support synchronous non-call exceptions
1573
1574 fomit-frame-pointer
1575 Common Report Var(flag_omit_frame_pointer) Optimization
1576 When possible do not generate stack frames
1577
1578 fopt-info
1579 Common Report Var(flag_opt_info) Optimization
1580 Enable all optimization info dumps on stderr
1581
1582 fopt-info-
1583 Common Joined RejectNegative Var(common_deferred_options) Defer
1584 -fopt-info[-<type>=filename]    Dump compiler optimization details
1585
1586 foptimize-register-move
1587 Common Report Var(flag_regmove) Optimization
1588 Do the full register move optimization pass
1589
1590 foptimize-sibling-calls
1591 Common Report Var(flag_optimize_sibling_calls) Optimization
1592 Optimize sibling and tail recursive calls
1593
1594 fpartial-inlining
1595 Common Report Var(flag_partial_inlining)
1596 Perform partial inlining
1597
1598 fpre-ipa-mem-report
1599 Common Report Var(pre_ipa_mem_report)
1600 Report on memory allocation before interprocedural optimization
1601
1602 fpost-ipa-mem-report
1603 Common Report Var(post_ipa_mem_report)
1604 Report on memory allocation before interprocedural optimization
1605
1606 fpack-struct
1607 Common Report Var(flag_pack_struct) Optimization
1608 Pack structure members together without holes
1609
1610 fpack-struct=
1611 Common RejectNegative Joined UInteger Optimization
1612 -fpack-struct=<number>  Set initial maximum structure member alignment
1613
1614 fpcc-struct-return
1615 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1616 Return small aggregates in memory, not registers
1617
1618 fpeel-loops
1619 Common Report Var(flag_peel_loops) Optimization
1620 Perform loop peeling
1621
1622 fpeephole
1623 Common Report Var(flag_no_peephole,0) Optimization
1624 Enable machine specific peephole optimizations
1625
1626 fpeephole2
1627 Common Report Var(flag_peephole2) Optimization
1628 Enable an RTL peephole pass before sched2
1629
1630 fPIC
1631 Common Report Var(flag_pic,2) Negative(fPIE)
1632 Generate position-independent code if possible (large mode)
1633
1634 fPIE
1635 Common Report Var(flag_pie,2) Negative(fpic)
1636 Generate position-independent code for executables if possible (large mode)
1637
1638 fpic
1639 Common Report Var(flag_pic,1) Negative(fpie)
1640 Generate position-independent code if possible (small mode)
1641
1642 fpie
1643 Common Report Var(flag_pie,1) Negative(fPIC)
1644 Generate position-independent code for executables if possible (small mode)
1645
1646 fplugin=
1647 Common Joined RejectNegative Var(common_deferred_options) Defer
1648 Specify a plugin to load
1649
1650 fplugin-arg-
1651 Common Joined RejectNegative Var(common_deferred_options) Defer
1652 -fplugin-arg-<name>-<key>[=<value>]     Specify argument <key>=<value> for plugin <name>
1653
1654 fpredictive-commoning
1655 Common Report Var(flag_predictive_commoning) Optimization
1656 Run predictive commoning optimization.
1657
1658 fprefetch-loop-arrays
1659 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1660 Generate prefetch instructions, if available, for arrays in loops
1661
1662 fprofile
1663 Common Report Var(profile_flag)
1664 Enable basic program profiling code
1665
1666 fprofile-arcs
1667 Common Report Var(profile_arc_flag)
1668 Insert arc-based program profiling code
1669
1670 fprofile-dir=
1671 Common Joined RejectNegative Var(profile_data_prefix)
1672 Set the top-level directory for storing the profile data.
1673 The default is 'pwd'.
1674
1675 fprofile-correction
1676 Common Report Var(flag_profile_correction)
1677 Enable correction of flow inconsistent profile data input
1678
1679 fprofile-generate
1680 Common
1681 Enable common options for generating profile info for profile feedback directed optimizations
1682
1683 fprofile-generate=
1684 Common Joined RejectNegative
1685 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1686
1687 fprofile-use
1688 Common Var(flag_profile_use)
1689 Enable common options for performing profile feedback directed optimizations
1690
1691 fprofile-use=
1692 Common Joined RejectNegative
1693 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1694
1695 fprofile-values
1696 Common Report Var(flag_profile_values)
1697 Insert code to profile values of expressions
1698
1699 fprofile-report
1700 Common Report Var(profile_report)
1701 Report on consistency of profile
1702
1703 frandom-seed
1704 Common Var(common_deferred_options) Defer
1705
1706 frandom-seed=
1707 Common Joined RejectNegative Var(common_deferred_options) Defer
1708 -frandom-seed=<string>  Make compile reproducible using <string>
1709
1710 ; This switch causes the command line that was used to create an
1711 ; object file to be recorded into the object file.  The exact format
1712 ; of this recording is target and binary file format dependent.
1713 ; It is related to the -fverbose-asm switch, but that switch only
1714 ; records information in the assembler output file as comments, so
1715 ; they never reach the object file.
1716 frecord-gcc-switches
1717 Common Report Var(flag_record_gcc_switches)
1718 Record gcc command line switches in the object file.
1719
1720 freg-struct-return
1721 Common Report Var(flag_pcc_struct_return,0) Optimization
1722 Return small aggregates in registers
1723
1724 fregmove
1725 Common Report Var(flag_regmove) Optimization
1726 Enables a register move optimization
1727
1728 frename-registers
1729 Common Report Var(flag_rename_registers) Init(2) Optimization
1730 Perform a register renaming optimization pass
1731
1732 freorder-blocks
1733 Common Report Var(flag_reorder_blocks) Optimization
1734 Reorder basic blocks to improve code placement
1735
1736 freorder-blocks-and-partition
1737 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1738 Reorder basic blocks and partition into hot and cold sections
1739
1740 freorder-functions
1741 Common Report Var(flag_reorder_functions) Optimization
1742 Reorder functions to improve code placement
1743
1744 frerun-cse-after-loop
1745 Common Report Var(flag_rerun_cse_after_loop) Optimization
1746 Add a common subexpression elimination pass after loop optimizations
1747
1748 frerun-loop-opt
1749 Common Ignore
1750 Does nothing.  Preserved for backward compatibility.
1751
1752 frounding-math
1753 Common Report Var(flag_rounding_math) Optimization SetByCombined
1754 Disable optimizations that assume default FP rounding behavior
1755
1756 fsched-interblock
1757 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1758 Enable scheduling across basic blocks
1759
1760 fsched-pressure
1761 Common Report Var(flag_sched_pressure) Init(0) Optimization
1762 Enable register pressure sensitive insn scheduling
1763
1764 fsched-spec
1765 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1766 Allow speculative motion of non-loads
1767
1768 fsched-spec-load
1769 Common Report Var(flag_schedule_speculative_load) Optimization
1770 Allow speculative motion of some loads
1771
1772 fsched-spec-load-dangerous
1773 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1774 Allow speculative motion of more loads
1775
1776 fsched-verbose=
1777 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1778 -fsched-verbose=<number>        Set the verbosity level of the scheduler
1779
1780 fsched2-use-superblocks
1781 Common Report Var(flag_sched2_use_superblocks) Optimization
1782 If scheduling post reload, do superblock scheduling
1783
1784 fsched2-use-traces
1785 Common Ignore
1786 Does nothing.  Preserved for backward compatibility.
1787
1788 fschedule-insns
1789 Common Report Var(flag_schedule_insns) Optimization
1790 Reschedule instructions before register allocation
1791
1792 fschedule-insns2
1793 Common Report Var(flag_schedule_insns_after_reload) Optimization
1794 Reschedule instructions after register allocation
1795
1796 ; This flag should be on when a target implements non-trivial
1797 ; scheduling hooks, maybe saving some information for its own sake.
1798 ; On IA64, for example, this is used for correct bundling.
1799 fselective-scheduling
1800 Common Report Var(flag_selective_scheduling) Optimization
1801 Schedule instructions using selective scheduling algorithm
1802
1803 fselective-scheduling2
1804 Common Report Var(flag_selective_scheduling2) Optimization
1805 Run selective scheduling after reload
1806
1807 fsel-sched-pipelining
1808 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1809 Perform software pipelining of inner loops during selective scheduling
1810
1811 fsel-sched-pipelining-outer-loops
1812 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1813 Perform software pipelining of outer loops during selective scheduling
1814
1815 fsel-sched-reschedule-pipelined
1816 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1817 Reschedule pipelined regions without pipelining
1818
1819 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1820 ; of stalled insns into the ready list.
1821 fsched-stalled-insns
1822 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1823 Allow premature scheduling of queued insns
1824
1825 fsched-stalled-insns=
1826 Common RejectNegative Joined UInteger
1827 -fsched-stalled-insns=<number>  Set number of queued insns that can be prematurely scheduled
1828
1829 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1830 ; be examined for a dependency on a stalled insn that is candidate for
1831 ; premature removal from the queue of stalled insns into the ready list (has
1832 ; an effect only if the flag 'sched_stalled_insns' is set).
1833 fsched-stalled-insns-dep
1834 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1835 Set dependence distance checking in premature scheduling of queued insns
1836
1837 fsched-stalled-insns-dep=
1838 Common RejectNegative Joined UInteger
1839 -fsched-stalled-insns-dep=<number>      Set dependence distance checking in premature scheduling of queued insns
1840
1841 fsched-group-heuristic
1842 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1843 Enable the group heuristic in the scheduler
1844
1845 fsched-critical-path-heuristic
1846 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1847 Enable the critical path heuristic in the scheduler
1848
1849 fsched-spec-insn-heuristic
1850 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1851 Enable the speculative instruction heuristic in the scheduler
1852
1853 fsched-rank-heuristic
1854 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1855 Enable the rank heuristic in the scheduler
1856
1857 fsched-last-insn-heuristic
1858 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1859 Enable the last instruction heuristic in the scheduler
1860
1861 fsched-dep-count-heuristic
1862 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1863 Enable the dependent count heuristic in the scheduler
1864
1865 fsection-anchors
1866 Common Report Var(flag_section_anchors) Optimization
1867 Access data in the same section from shared anchor points
1868
1869 fsee
1870 Common Ignore
1871 Does nothing.  Preserved for backward compatibility.
1872
1873 fzee
1874 Common Ignore
1875 Does nothing.  Preserved for backward compatibility.
1876
1877 free
1878 Common Report Var(flag_ree) Init(0)
1879 Turn on Redundant Extensions Elimination pass.
1880
1881 fshow-column
1882 Common Report Var(flag_show_column) Init(1)
1883 Show column numbers in diagnostics, when available.  Default on
1884
1885 fshrink-wrap
1886 Common Report Var(flag_shrink_wrap) Optimization
1887 Emit function prologues only before parts of the function that need it,
1888 rather than at the top of the function.
1889
1890 fsignaling-nans
1891 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1892 Disable optimizations observable by IEEE signaling NaNs
1893
1894 fsigned-zeros
1895 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1896 Disable floating point optimizations that ignore the IEEE signedness of zero
1897
1898 fsingle-precision-constant
1899 Common Report Var(flag_single_precision_constant) Optimization
1900 Convert floating point constants to single precision constants
1901
1902 fsplit-ivs-in-unroller
1903 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1904 Split lifetimes of induction variables when loops are unrolled
1905
1906 fsplit-stack
1907 Common Report Var(flag_split_stack) Init(-1)
1908 Generate discontiguous stack frames
1909
1910 fsplit-wide-types
1911 Common Report Var(flag_split_wide_types) Optimization
1912 Split wide types into independent registers
1913
1914 fvariable-expansion-in-unroller
1915 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1916 Apply variable expansion when loops are unrolled
1917
1918 fstack-check=
1919 Common Report RejectNegative Joined
1920 -fstack-check=[no|generic|specific]     Insert stack checking code into the program
1921
1922 fstack-check
1923 Common Alias(fstack-check=, specific, no)
1924 Insert stack checking code into the program.  Same as -fstack-check=specific
1925
1926 fstack-limit
1927 Common Var(common_deferred_options) Defer
1928
1929 fstack-limit-register=
1930 Common RejectNegative Joined Var(common_deferred_options) Defer
1931 -fstack-limit-register=<register>       Trap if the stack goes past <register>
1932
1933 fstack-limit-symbol=
1934 Common RejectNegative Joined Var(common_deferred_options) Defer
1935 -fstack-limit-symbol=<name>     Trap if the stack goes past symbol <name>
1936
1937 fstack-protector
1938 Common Report Var(flag_stack_protect, 1)
1939 Use propolice as a stack protection method
1940
1941 fstack-protector-all
1942 Common Report RejectNegative Var(flag_stack_protect, 2)
1943 Use a stack protection method for every function
1944
1945 fstack-protector-strong
1946 Common Report RejectNegative Var(flag_stack_protect, 3)
1947 Use a smart stack protection method for certain functions
1948
1949 fstack-usage
1950 Common RejectNegative Var(flag_stack_usage)
1951 Output stack usage information on a per-function basis
1952
1953 fstrength-reduce
1954 Common Ignore
1955 Does nothing.  Preserved for backward compatibility.
1956
1957 ; Nonzero if we should do (language-dependent) alias analysis.
1958 ; Typically, this analysis will assume that expressions of certain
1959 ; types do not alias expressions of certain other types.  Only used
1960 ; if alias analysis (in general) is enabled.
1961 fstrict-aliasing
1962 Common Report Var(flag_strict_aliasing) Optimization
1963 Assume strict aliasing rules apply
1964
1965 fstrict-overflow
1966 Common Report Var(flag_strict_overflow)
1967 Treat signed overflow as undefined
1968
1969 fsync-libcalls
1970 Common Report Var(flag_sync_libcalls) Init(1)
1971 Implement __atomic operations via libcalls to legacy __sync functions
1972
1973 fsyntax-only
1974 Common Report Var(flag_syntax_only)
1975 Check for syntax errors, then stop
1976
1977 ftest-coverage
1978 Common Report Var(flag_test_coverage)
1979 Create data files needed by \"gcov\"
1980
1981 fthread-jumps
1982 Common Report Var(flag_thread_jumps) Optimization
1983 Perform jump threading optimizations
1984
1985 ftime-report
1986 Common Report Var(time_report)
1987 Report the time taken by each compiler pass
1988
1989 ftls-model=
1990 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
1991 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec]      Set the default thread-local storage code generation model
1992
1993 Enum
1994 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
1995
1996 EnumValue
1997 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
1998
1999 EnumValue
2000 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2001
2002 EnumValue
2003 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2004
2005 EnumValue
2006 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2007
2008 ftoplevel-reorder
2009 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
2010 Reorder top level functions, variables, and asms
2011
2012 ftracer
2013 Common Report Var(flag_tracer)
2014 Perform superblock formation via tail duplication
2015
2016 ; Zero means that floating-point math operations cannot generate a
2017 ; (user-visible) trap.  This is the case, for example, in nonstop
2018 ; IEEE 754 arithmetic.
2019 ftrapping-math
2020 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2021 Assume floating-point operations can trap
2022
2023 ftrapv
2024 Common Report Var(flag_trapv) Optimization
2025 Trap for signed overflow in addition, subtraction and multiplication
2026
2027 ftree-ccp
2028 Common Report Var(flag_tree_ccp) Optimization
2029 Enable SSA-CCP optimization on trees
2030
2031 ftree-bit-ccp
2032 Common Report Var(flag_tree_bit_ccp) Optimization
2033 Enable SSA-BIT-CCP optimization on trees
2034
2035 ftree-store-ccp
2036 Common Ignore
2037 Does nothing.  Preserved for backward compatibility.
2038
2039 ftree-ch
2040 Common Report Var(flag_tree_ch) Optimization
2041 Enable loop header copying on trees
2042
2043 ftree-coalesce-inlined-vars
2044 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2045 Enable coalescing of copy-related user variables that are inlined
2046
2047 ftree-coalesce-vars
2048 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2049 Enable coalescing of all copy-related user variables
2050
2051 ftree-copyrename
2052 Common Report Var(flag_tree_copyrename) Optimization
2053 Replace SSA temporaries with better names in copies
2054
2055 ftree-copy-prop
2056 Common Report Var(flag_tree_copy_prop) Optimization
2057 Enable copy propagation on trees
2058
2059 ftree-store-copy-prop
2060 Common Ignore
2061 Does nothing.  Preserved for backward compatibility.
2062
2063 ftree-cselim
2064 Common Report Var(flag_tree_cselim) Init(2) Optimization
2065 Transform condition stores into unconditional ones
2066
2067 ftree-switch-conversion
2068 Common Report Var(flag_tree_switch_conversion) Optimization
2069 Perform conversions of switch initializations.
2070
2071 ftree-dce
2072 Common Report Var(flag_tree_dce) Optimization
2073 Enable SSA dead code elimination optimization on trees
2074
2075 ftree-dominator-opts
2076 Common Report Var(flag_tree_dom) Optimization
2077 Enable dominator optimizations
2078
2079 ftree-tail-merge
2080 Common Report Var(flag_tree_tail_merge) Optimization
2081 Enable tail merging on trees
2082
2083 ftree-dse
2084 Common Report Var(flag_tree_dse) Optimization
2085 Enable dead store elimination
2086
2087 ftree-forwprop
2088 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2089 Enable forward propagation on trees
2090
2091 ftree-fre
2092 Common Report Var(flag_tree_fre) Optimization
2093 Enable Full Redundancy Elimination (FRE) on trees
2094
2095 foptimize-strlen
2096 Common Report Var(flag_optimize_strlen) Optimization
2097 Enable string length optimizations on trees
2098
2099 ftree-loop-distribution
2100 Common Report Var(flag_tree_loop_distribution) Optimization
2101 Enable loop distribution on trees
2102
2103 ftree-loop-distribute-patterns
2104 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2105 Enable loop distribution for patterns transformed into a library call
2106
2107 ftree-loop-im
2108 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2109 Enable loop invariant motion on trees
2110
2111 ftree-loop-linear
2112 Common Alias(floop-interchange)
2113 Enable loop interchange transforms.  Same as -floop-interchange
2114
2115 ftree-loop-ivcanon
2116 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2117 Create canonical induction variables in loops
2118
2119 ftree-loop-optimize
2120 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2121 Enable loop optimizations on tree level
2122
2123 ftree-parallelize-loops=
2124 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2125 Enable automatic parallelization of loops
2126
2127 ftree-phiprop
2128 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2129 Enable hoisting loads from conditional pointers.
2130
2131 ftree-pre
2132 Common Report Var(flag_tree_pre) Optimization
2133 Enable SSA-PRE optimization on trees
2134
2135 ftree-partial-pre
2136 Common Report Var(flag_tree_partial_pre) Optimization
2137 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2138
2139 ftree-pta
2140 Common Report Var(flag_tree_pta) Init(1) Optimization
2141 Perform function-local points-to analysis on trees.
2142
2143 ftree-reassoc
2144 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2145 Enable reassociation on tree level
2146
2147 ftree-salias
2148 Common Ignore
2149 Does nothing.  Preserved for backward compatibility.
2150
2151 ftree-sink
2152 Common Report Var(flag_tree_sink) Optimization
2153 Enable SSA code sinking on trees
2154
2155 ftree-slsr
2156 Common Report Var(flag_tree_slsr) Optimization
2157 Perform straight-line strength reduction
2158
2159 ftree-sra
2160 Common Report Var(flag_tree_sra) Optimization
2161 Perform scalar replacement of aggregates
2162
2163 ftree-ter
2164 Common Report Var(flag_tree_ter) Optimization
2165 Replace temporary expressions in the SSA->normal pass
2166
2167 ftree-lrs
2168 Common Report Var(flag_tree_live_range_split) Optimization
2169 Perform live range splitting during the SSA->normal pass
2170
2171 ftree-vrp
2172 Common Report Var(flag_tree_vrp) Init(0) Optimization
2173 Perform Value Range Propagation on trees
2174
2175 funit-at-a-time
2176 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2177 Compile whole compilation unit at a time
2178
2179 funroll-loops
2180 Common Report Var(flag_unroll_loops) Optimization
2181 Perform loop unrolling when iteration count is known
2182
2183 funroll-all-loops
2184 Common Report Var(flag_unroll_all_loops) Optimization
2185 Perform loop unrolling for all loops
2186
2187 ; Nonzero means that loop optimizer may assume that the induction variables
2188 ; that control loops do not overflow and that the loops with nontrivial
2189 ; exit condition are not infinite
2190 funsafe-loop-optimizations
2191 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2192 Allow loop optimizations to assume that the loops behave in normal way
2193
2194 fassociative-math
2195 Common Report Var(flag_associative_math) SetByCombined
2196 Allow optimization for floating-point arithmetic which may change the
2197 result of the operation due to rounding.
2198
2199 freciprocal-math
2200 Common Report Var(flag_reciprocal_math) SetByCombined
2201 Same as -fassociative-math for expressions which include division.
2202
2203 ; Nonzero means that unsafe floating-point math optimizations are allowed
2204 ; for the sake of speed.  IEEE compliance is not guaranteed, and operations
2205 ; are allowed to assume that their arguments and results are "normal"
2206 ; (e.g., nonnegative for SQRT).
2207 funsafe-math-optimizations
2208 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2209 Allow math optimizations that may violate IEEE or ISO standards
2210
2211 funswitch-loops
2212 Common Report Var(flag_unswitch_loops) Optimization
2213 Perform loop unswitching
2214
2215 funwind-tables
2216 Common Report Var(flag_unwind_tables) Optimization
2217 Just generate unwind tables for exception handling
2218
2219 fuse-ld=bfd
2220 Common Negative(fuse-ld=gold)
2221 Use the bfd linker instead of the default linker
2222
2223 fuse-ld=gold
2224 Common Negative(fuse-ld=bfd)
2225 Use the gold linker instead of the default linker
2226
2227 fuse-linker-plugin
2228 Common Undocumented
2229
2230 ; Positive if we should track variables, negative if we should run
2231 ; the var-tracking pass only to discard debug annotations, zero if
2232 ; we're not to run it.  When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2233 ; will be set according to optimize, debug_info_level and debug_hooks
2234 ; in process_options ().
2235 fvar-tracking
2236 Common Report Var(flag_var_tracking) Init(2) Optimization
2237 Perform variable tracking
2238
2239 ; Positive if we should track variables at assignments, negative if
2240 ; we should run the var-tracking pass only to discard debug
2241 ; annotations.  When flag_var_tracking_assignments ==
2242 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2243 fvar-tracking-assignments
2244 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2245 Perform variable tracking by annotating assignments
2246
2247 ; Nonzero if we should toggle flag_var_tracking_assignments after
2248 ; processing options and computing its default.  */
2249 fvar-tracking-assignments-toggle
2250 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2251 Toggle -fvar-tracking-assignments
2252
2253 ; Positive if we should track uninitialized variables, negative if
2254 ; we should run the var-tracking pass only to discard debug
2255 ; annotations.  When flag_var_tracking_uninit == AUTODETECT_VALUE it
2256 ; will be set according to flag_var_tracking.
2257 fvar-tracking-uninit
2258 Common Report Var(flag_var_tracking_uninit) Optimization
2259 Perform variable tracking and also tag variables that are uninitialized
2260
2261 ftree-vectorize
2262 Common Report Var(flag_tree_vectorize) Optimization
2263 Enable loop vectorization on trees
2264
2265 ftree-vectorizer-verbose=
2266 Common RejectNegative Joined UInteger Var(common_deferred_options) Defer
2267 -ftree-vectorizer-verbose=<number>      This switch is deprecated. Use -fopt-info instead.
2268
2269 ftree-slp-vectorize
2270 Common Report Var(flag_tree_slp_vectorize) Init(2) Optimization
2271 Enable basic block vectorization (SLP) on trees
2272
2273 fvect-cost-model
2274 Common Report Var(flag_vect_cost_model) Optimization
2275 Enable use of cost model in vectorization
2276
2277 ftree-vect-loop-version
2278 Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization
2279 Enable loop versioning when doing loop vectorization on trees
2280
2281 ftree-scev-cprop
2282 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2283 Enable copy propagation of scalar-evolution information.
2284
2285 ; -fverbose-asm causes extra commentary information to be produced in
2286 ; the generated assembly code (to make it more readable).  This option
2287 ; is generally only of use to those who actually need to read the
2288 ; generated assembly code (perhaps while debugging the compiler itself).
2289 ; -fno-verbose-asm, the default, causes the extra information
2290 ; to not be added and is useful when comparing two assembler files.
2291 fverbose-asm
2292 Common Report Var(flag_verbose_asm)
2293 Add extra commentary to assembler output
2294
2295 fvisibility=
2296 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2297 -fvisibility=[default|internal|hidden|protected]        Set the default symbol visibility
2298
2299 Enum
2300 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2301
2302 EnumValue
2303 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2304
2305 EnumValue
2306 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2307
2308 EnumValue
2309 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2310
2311 EnumValue
2312 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2313
2314 fvpt
2315 Common Report Var(flag_value_profile_transformations) Optimization
2316 Use expression value profiles in optimizations
2317
2318 fweb
2319 Common Report Var(flag_web) Init(2) Optimization
2320 Construct webs and split unrelated uses of single variable
2321
2322 ftree-builtin-call-dce
2323 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2324 Enable conditional dead code elimination for builtin calls
2325
2326 fwhole-program
2327 Common Report Var(flag_whole_program) Init(0) Optimization
2328 Perform whole program optimizations
2329
2330 fwrapv
2331 Common Report Var(flag_wrapv) Optimization
2332 Assume signed arithmetic overflow wraps around
2333
2334 fzero-initialized-in-bss
2335 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2336 Put zero initialized data in the bss section
2337
2338 g
2339 Common JoinedOrMissing
2340 Generate debug information in default format
2341
2342 gcoff
2343 Common JoinedOrMissing Negative(gdwarf)
2344 Generate debug information in COFF format
2345
2346 gdwarf
2347 Common JoinedOrMissing Negative(gdwarf-)
2348 Generate debug information in default version of DWARF format
2349
2350 gdwarf-
2351 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2352 Generate debug information in DWARF v2 (or later) format
2353
2354 ggdb
2355 Common JoinedOrMissing
2356 Generate debug information in default extended format
2357
2358 gno-pubnames
2359 Common RejectNegative Var(debug_generate_pub_sections, 0) Init(-1)
2360 Don't generate DWARF pubnames and pubtypes sections.
2361
2362 gpubnames
2363 Common RejectNegative Var(debug_generate_pub_sections, 1)
2364 Generate DWARF pubnames and pubtypes sections.
2365
2366 gno-record-gcc-switches
2367 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2368 Don't record gcc command line switches in DWARF DW_AT_producer.
2369
2370 grecord-gcc-switches
2371 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2372 Record gcc command line switches in DWARF DW_AT_producer.
2373
2374 gno-split-dwarf
2375 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2376 Don't generate debug information in separate .dwo files
2377
2378 gsplit-dwarf
2379 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2380 Generate debug information in separate .dwo files
2381
2382 gstabs
2383 Common JoinedOrMissing Negative(gstabs+)
2384 Generate debug information in STABS format
2385
2386 gstabs+
2387 Common JoinedOrMissing Negative(gvms)
2388 Generate debug information in extended STABS format
2389
2390 gno-strict-dwarf
2391 Common RejectNegative Var(dwarf_strict,0) Init(0)
2392 Emit DWARF additions beyond selected version
2393
2394 gstrict-dwarf
2395 Common Report RejectNegative Var(dwarf_strict,1)
2396 Don't emit DWARF additions beyond selected version
2397
2398 gtoggle
2399 Common Report Var(flag_gtoggle)
2400 Toggle debug information generation
2401
2402 gvms
2403 Common JoinedOrMissing Negative(gxcoff)
2404 Generate debug information in VMS format
2405
2406 gxcoff
2407 Common JoinedOrMissing Negative(gxcoff+)
2408 Generate debug information in XCOFF format
2409
2410 gxcoff+
2411 Common JoinedOrMissing Negative(gcoff)
2412 Generate debug information in extended XCOFF format
2413
2414 h
2415 Driver Joined Separate
2416
2417 iplugindir=
2418 Common Joined Var(plugindir_string) Init(0)
2419 -iplugindir=<dir>       Set <dir> to be the default plugin directory
2420
2421 imultiarch
2422 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2423 -imultiarch <dir>       Set <dir> to be the multiarch include subdirectory
2424
2425 l
2426 Driver Joined Separate
2427
2428 n
2429 Driver
2430
2431 no-canonical-prefixes
2432 Driver
2433
2434 nodefaultlibs
2435 Driver
2436
2437 nostartfiles
2438 Driver
2439
2440 nostdlib
2441 Driver
2442
2443 o
2444 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2445 -o <file>       Place output into <file>
2446
2447 p
2448 Common Var(profile_flag)
2449 Enable function profiling
2450
2451 pass-exit-codes
2452 Driver Var(pass_exit_codes)
2453
2454 pedantic
2455 Common Alias(Wpedantic)
2456
2457 pedantic-errors
2458 Common Var(flag_pedantic_errors)
2459 Like -pedantic but issue them as errors
2460
2461 pg
2462 Driver
2463
2464 pipe
2465 Driver Var(use_pipes)
2466
2467 print-file-name=
2468 Driver JoinedOrMissing Var(print_file_name)
2469
2470 print-libgcc-file-name
2471 Driver
2472
2473 print-multi-directory
2474 Driver Var(print_multi_directory)
2475
2476 print-multi-lib
2477 Driver Var(print_multi_lib)
2478
2479 print-multi-os-directory
2480 Driver Var(print_multi_os_directory)
2481
2482 print-multiarch
2483 Driver Var(print_multiarch)
2484
2485 print-prog-name=
2486 Driver JoinedOrMissing Var(print_prog_name)
2487
2488 print-search-dirs
2489 Driver Var(print_search_dirs)
2490
2491 print-sysroot
2492 Driver Var(print_sysroot)
2493
2494 print-sysroot-headers-suffix
2495 Driver Var(print_sysroot_headers_suffix)
2496
2497 quiet
2498 Common Var(quiet_flag) RejectDriver
2499 Do not display functions compiled or elapsed time
2500
2501 r
2502 Driver
2503
2504 s
2505 Driver
2506
2507 save-temps
2508 Driver
2509
2510 save-temps=
2511 Driver Joined
2512
2513 t
2514 Driver
2515
2516 time
2517 Driver Var(report_times)
2518
2519 time=
2520 Driver JoinedOrMissing
2521
2522 u
2523 Driver Joined Separate
2524
2525 undef
2526 Driver
2527 ; C option, but driver must not handle as "-u ndef".
2528
2529 v
2530 Common Driver Var(verbose_flag)
2531 Enable verbose output
2532
2533 version
2534 Common Var(version_flag) RejectDriver
2535 Display the compiler's version
2536
2537 w
2538 Common Var(inhibit_warnings)
2539 Suppress warnings
2540
2541 wrapper
2542 Driver Separate Var(wrapper_string)
2543
2544 x
2545 Driver Joined Separate
2546
2547 shared
2548 Driver RejectNegative Negative(pie)
2549 Create a shared library
2550
2551 shared-libgcc
2552 Driver
2553
2554 specs
2555 Driver Separate Alias(specs=)
2556
2557 specs=
2558 Driver Joined
2559
2560 static
2561 Driver
2562
2563 static-libgcc
2564 Driver
2565
2566 static-libgfortran
2567 Driver
2568 ; Documented for Fortran, but always accepted by driver.
2569
2570 static-libstdc++
2571 Driver
2572
2573 static-libgo
2574 Driver
2575 ; Documented for Go, but always accepted by driver.
2576
2577 static-libasan
2578 Driver
2579
2580 static-libtsan
2581 Driver
2582
2583 symbolic
2584 Driver
2585
2586 pie
2587 Driver RejectNegative Negative(shared)
2588 Create a position independent executable
2589
2590 z
2591 Driver Joined Separate
2592
2593 ; This comment is to ensure we retain the blank line above.