gcc/common.opt

   1 ; Options for the language- and target-independent parts of the compiler.
   2
   3 ; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
   4 ; Free Software Foundation, Inc.
   5 ;
   6 ; This file is part of GCC.
   7 ;
   8 ; GCC is free software; you can redistribute it and/or modify it under
   9 ; the terms of the GNU General Public License as published by the Free
  10 ; Software Foundation; either version 3, or (at your option) any later
  11 ; version.
  12 ;
  13 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 ; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 ; for more details.
  17 ;
  18 ; You should have received a copy of the GNU General Public License
  19 ; along with GCC; see the file COPYING3.  If not see
  20 ; <http://www.gnu.org/licenses/>.
  21
  22 ; See the GCC internals manual (options.texi) for a description of this file's format.
  23
  24 ; Please try to keep this file in ASCII collating order.
  25
  26 Variable
  27 int target_flags
  28
  29 Variable
  30 int optimize
  31
  32 Variable
  33 int optimize_size
  34
  35 Variable
  36 int optimize_debug
  37
  38 ; Not used directly to control optimizations, only to save -Ofast
  39 ; setting for "optimize" attributes.
  40 Variable
  41 int optimize_fast
  42
  43 ; True if this is the lto front end.  This is used to disable gimple
  44 ; generation and lowering passes that are normally run on the output
  45 ; of a front end.  These passes must be bypassed for lto since they
  46 ; have already been done before the gimple was written.
  47 Variable
  48 bool in_lto_p = false
  49
  50 ; 0 means straightforward implementation of complex divide acceptable.
  51 ; 1 means wide ranges of inputs must work for complex divide.
  52 ; 2 means C99-like requirements for complex multiply and divide.
  53 Variable
  54 int flag_complex_method = 1
  55
  56 ; Nonzero if subexpressions must be evaluated from left-to-right.
  57 Variable
  58 int flag_evaluation_order = 0
  59
  60 ; Language specific warning pass for unused results.
  61 Variable
  62 bool flag_warn_unused_result = false
  63
  64 Variable
  65 int *param_values
  66
  67 ; Nonzero if we should write GIMPLE bytecode for link-time optimization.
  68 Variable
  69 int flag_generate_lto
  70
  71 ; True to warn about any objects definitions whose size is larger
  72 ; than N bytes.  Also want about function definitions whose returned
  73 ; values are larger than N bytes, where N is 'larger_than_size'.
  74 Variable
  75 bool warn_larger_than
  76
  77 Variable
  78 HOST_WIDE_INT larger_than_size
  79
  80 ; True to warn about any function whose frame size is larger
  81 ; than N bytes.
  82 Variable
  83 bool warn_frame_larger_than
  84
  85 Variable
  86 HOST_WIDE_INT frame_larger_than_size
  87
  88 ; Nonzero means we should be saving declaration info into a .X file.
  89 Variable
  90 int flag_gen_aux_info = 0
  91
  92 ; Nonzero if we are compiling code for a shared library, zero for
  93 ; executable.
  94 Variable
  95 int flag_shlib
  96
  97 ; These two are really VEC(char_p,heap) *.
  98
  99 Variable
 100 void *flag_instrument_functions_exclude_functions
 101
 102 Variable
 103 void *flag_instrument_functions_exclude_files
 104
 105 ; Generic structs (e.g. templates not explicitly specialized)
 106 ; may not have a compilation unit associated with them, and so
 107 ; may need to be treated differently from ordinary structs.
 108 ;
 109 ; Structs only handled by reference (indirectly), will also usually
 110 ; not need as much debugging information.
 111
 112 Variable
 113 enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
 114
 115 Variable
 116 enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
 117
 118 ; True if we should exit after parsing options.
 119 Variable
 120 bool exit_after_options
 121
 122 ; Type(s) of debugging information we are producing (if any).  See
 123 ; flag-types.h for the definitions of the different possible types of
 124 ; debugging information.
 125 Variable
 126 enum debug_info_type write_symbols = NO_DEBUG
 127
 128 ; Level of debugging information we are producing.  See flag-types.h
 129 ; for the definitions of the different possible levels.
 130 Variable
 131 enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
 132
 133 ; Nonzero means use GNU-only extensions in the generated symbolic
 134 ; debugging information.  Currently, this only has an effect when
 135 ; write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG.
 136 Variable
 137 bool use_gnu_debug_info_extensions
 138
 139 ; Original value of maximum field alignment in bytes, specified via
 140 ; -fpack-struct=<value>.
 141 Variable
 142 unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
 143
 144 ; Type of stack check.
 145 Variable
 146 enum stack_check_type flag_stack_check = NO_STACK_CHECK
 147
 148 ; True if stack usage information needs to be computed.
 149 Variable
 150 bool flag_stack_usage_info = false
 151
 152 ; -dA causes debug commentary information to be produced in
 153 ; the generated assembly code (to make it more readable).  This option
 154 ; is generally only of use to those who actually need to read the
 155 ; generated assembly code (perhaps while debugging the compiler itself).
 156 ; Currently, this switch is only used by dwarf2out.c; however, it is intended
 157 ; to be a catchall for printing debug information in the assembler file.
 158 Variable
 159 int flag_debug_asm
 160
 161 ; -dP causes the rtl to be emitted as a comment in assembly.
 162 Variable
 163 int flag_dump_rtl_in_asm
 164
 165 ; Whether -da was passed (used only in handle_common_deferred_options).
 166 Variable
 167 bool flag_dump_all_passed
 168
 169 ; Other flags saying which kinds of debugging dump have been requested.
 170
 171 Variable
 172 int rtl_dump_and_exit
 173
 174 Variable
 175 int flag_print_asm_name
 176
 177 ; Name of top-level original source file (what was input to cpp).
 178 ; This comes from the #-command at the beginning of the actual input.
 179 ; If there isn't any there, then this is the cc1 input file name.
 180 Variable
 181 const char *main_input_filename
 182
 183 ; Pointer to base name in main_input_filename, with directories and a
 184 ; single final extension removed, and the length of this base
 185 ; name.
 186
 187 Variable
 188 const char *main_input_basename
 189
 190 Variable
 191 int main_input_baselength
 192
 193 ; Which options have been printed by --help.
 194 Variable
 195 char *help_printed
 196
 197 ; Which enums have been printed by --help.  0 = not printed, no
 198 ; relevant options seen, 1 = relevant option seen, not yet printed, 2
 199 ; = printed.
 200 Variable
 201 char *help_enum_printed
 202
 203 ; The number of columns for --help output.
 204 Variable
 205 unsigned int help_columns
 206
 207 ; Whether this options structure has been through finish_options
 208 Variable
 209 bool flag_opts_finished
 210
 211 ###
 212 Driver
 213
 214 -assemble
 215 Driver Alias(S)
 216
 217 -compile
 218 Driver Alias(c)
 219
 220 -coverage
 221 Driver Alias(coverage)
 222
 223 -debug
 224 Common Alias(g)
 225
 226 -dump
 227 Common Separate Alias(d)
 228
 229 -dump=
 230 Common Joined Alias(d)
 231
 232 -dumpbase
 233 Common Separate Alias(dumpbase)
 234
 235 -dumpdir
 236 Common Separate Alias(dumpdir)
 237
 238 -entry
 239 Driver Separate Alias(e)
 240
 241 -entry=
 242 Driver Joined Alias(e)
 243
 244 -extra-warnings
 245 Common Warning Alias(Wextra)
 246
 247 -for-assembler
 248 Driver Separate Alias(Xassembler)
 249
 250 -for-assembler=
 251 Driver JoinedOrMissing Alias(Xassembler)
 252
 253 -for-linker
 254 Driver Separate Alias(Xlinker)
 255
 256 -for-linker=
 257 Driver JoinedOrMissing Alias(Xlinker)
 258
 259 -force-link
 260 Driver Separate Alias(u)
 261
 262 -force-link=
 263 Driver Joined Alias(u)
 264
 265 -help
 266 Common Driver Var(help_flag)
 267 Display this information
 268
 269 -help=
 270 Common Driver Report Joined
 271 --help=<class>  Display descriptions of a specific class of options.  <class> is one or more of optimizers, target, warnings, undocumented, params
 272
 273 -language
 274 Driver Separate Alias(x)
 275
 276 -language=
 277 Driver Joined Alias(x)
 278
 279 -library-directory
 280 Driver Separate Alias(L)
 281
 282 -library-directory=
 283 Driver Joined Alias(L)
 284
 285 -no-canonical-prefixes
 286 Driver Alias(no-canonical-prefixes)
 287
 288 -no-standard-libraries
 289 Driver Alias(nostdlib)
 290
 291 -no-sysroot-suffix
 292 Driver Var(no_sysroot_suffix)
 293
 294 -no-warnings
 295 Common Alias(w)
 296
 297 -optimize
 298 Common Alias(O)
 299
 300 -output
 301 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
 302
 303 -output=
 304 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
 305
 306 -pass-exit-codes
 307 Driver Alias(pass-exit-codes)
 308
 309 -pedantic
 310 Common Alias(Wpedantic)
 311
 312 -pedantic-errors
 313 Common Alias(pedantic-errors)
 314
 315 -pie
 316 Driver Alias(pie)
 317
 318 -pipe
 319 Driver Alias(pipe)
 320
 321 -prefix
 322 Driver Separate Alias(B)
 323
 324 -prefix=
 325 Driver JoinedOrMissing Alias(B)
 326
 327 -preprocess
 328 Driver Alias(E)
 329
 330 -print-file-name
 331 Driver Separate Alias(print-file-name=)
 332
 333 -print-file-name=
 334 Driver JoinedOrMissing Alias(print-file-name=)
 335
 336 -print-libgcc-file-name
 337 Driver Alias(print-libgcc-file-name)
 338
 339 -print-multi-directory
 340 Driver Alias(print-multi-directory)
 341
 342 -print-multi-lib
 343 Driver Alias(print-multi-lib)
 344
 345 -print-multi-os-directory
 346 Driver Alias(print-multi-os-directory)
 347
 348 -print-multiarch
 349 Driver Alias(print-multiarch)
 350
 351 -print-prog-name
 352 Driver Separate Alias(print-prog-name=)
 353
 354 -print-prog-name=
 355 Driver JoinedOrMissing Alias(print-prog-name=)
 356
 357 -print-search-dirs
 358 Driver Alias(print-search-dirs)
 359
 360 -print-sysroot
 361 Driver Alias(print-sysroot)
 362
 363 -print-sysroot-headers-suffix
 364 Driver Alias(print-sysroot-headers-suffix)
 365
 366 -profile
 367 Common Alias(p)
 368
 369 -save-temps
 370 Driver Alias(save-temps)
 371
 372 -shared
 373 Driver Alias(shared)
 374
 375 -specs
 376 Driver Separate Alias(specs=)
 377
 378 -specs=
 379 Driver Joined Alias(specs=)
 380
 381 -static
 382 Driver Alias(static)
 383
 384 -symbolic
 385 Driver Alias(symbolic)
 386
 387 -target-help
 388 Common Driver
 389 Alias for --help=target
 390
 391 -time
 392 Driver Alias(time)
 393
 394 -verbose
 395 Driver Alias(v)
 396
 397 ;; The driver used to convert options such as --help into forms such
 398 ;; as -fhelp; the following four entries are for compatibility with
 399 ;; any direct uses of those (undocumented) -f forms
 400 fhelp
 401 Common Driver Alias(-help)
 402
 403 fhelp=
 404 Common Driver Joined Alias(-help=)
 405
 406 ftarget-help
 407 Common Driver Alias(-target-help)
 408
 409 fversion
 410 Common Driver Alias(-version)
 411
 412 -param
 413 Common Separate
 414 --param <param>=<value> Set parameter <param> to value.  See below for a complete list of parameters
 415
 416 -param=
 417 Common Joined Alias(-param)
 418
 419 -sysroot
 420 Driver Separate Alias(-sysroot=)
 421
 422 -sysroot=
 423 Driver JoinedOrMissing
 424
 425 -version
 426 Common Driver
 427
 428 B
 429 Driver Joined Separate
 430
 431 E
 432 Driver
 433
 434 L
 435 Driver Joined Separate
 436
 437 N
 438 Driver
 439
 440 O
 441 Common JoinedOrMissing Optimization
 442 -O<number>      Set optimization level to <number>
 443
 444 Os
 445 Common Optimization
 446 Optimize for space rather than speed
 447
 448 Ofast
 449 Common Optimization
 450 Optimize for speed disregarding exact standards compliance
 451
 452 Og
 453 Common Optimization
 454 Optimize for debugging experience rather than speed or size
 455
 456 Q
 457 Driver
 458
 459 Qn
 460 Driver Negative(Qy)
 461
 462 Qy
 463 Driver Negative(Qn)
 464
 465 R
 466 Driver Joined Separate
 467
 468 S
 469 Driver
 470
 471 T
 472 Driver Joined Separate
 473
 474 Tbss
 475 Driver Separate
 476
 477 Tbss=
 478 Driver Joined
 479
 480 Tdata
 481 Driver Separate
 482
 483 Tdata=
 484 Driver Joined
 485
 486 Ttext
 487 Driver Separate
 488
 489 Ttext=
 490 Driver Joined
 491
 492 W
 493 Common RejectNegative Warning Alias(Wextra)
 494 This switch is deprecated; use -Wextra instead
 495
 496 Wa,
 497 Driver JoinedOrMissing
 498
 499 Wl,
 500 Driver JoinedOrMissing
 501
 502 Wp,
 503 Driver JoinedOrMissing
 504
 505 Waggregate-return
 506 Common Var(warn_aggregate_return) Warning
 507 Warn about returning structures, unions or arrays
 508
 509 Warray-bounds
 510 Common Var(warn_array_bounds) Warning
 511 Warn if an array is accessed out of bounds
 512
 513 Wattributes
 514 Common Var(warn_attributes) Init(1) Warning
 515 Warn about inappropriate attribute usage
 516
 517 Wcast-align
 518 Common Var(warn_cast_align) Warning
 519 Warn about pointer casts which increase alignment
 520
 521 Wcpp
 522 Common Var(warn_cpp) Init(1) Warning
 523 Warn when a #warning directive is encountered
 524
 525 Wdeprecated-declarations
 526 Common Var(warn_deprecated_decl) Init(1) Warning
 527 Warn about uses of __attribute__((deprecated)) declarations
 528
 529 Wdisabled-optimization
 530 Common Var(warn_disabled_optimization) Warning
 531 Warn when an optimization pass is disabled
 532
 533 Werror
 534 Common Var(warnings_are_errors)
 535 Treat all warnings as errors
 536
 537 Werror=
 538 Common Joined
 539 Treat specified warning as error
 540
 541 Wextra
 542 Common Var(extra_warnings) Warning
 543 Print extra (possibly unwanted) warnings
 544
 545 Wfatal-errors
 546 Common Var(flag_fatal_errors)
 547 Exit on the first error occurred
 548
 549 Wframe-larger-than=
 550 Common RejectNegative Joined UInteger
 551 -Wframe-larger-than=<number>    Warn if a function's stack frame requires more than <number> bytes
 552
 553 Wfree-nonheap-object
 554 Common Var(warn_free_nonheap_object) Init(1) Warning
 555 Warn when attempting to free a non-heap object
 556
 557 Winline
 558 Common Var(warn_inline) Warning
 559 Warn when an inlined function cannot be inlined
 560
 561 Winvalid-memory-model
 562 Common Var(warn_invalid_memory_model) Init(1) Warning
 563 Warn when an atomic memory model parameter is known to be outside the valid range.
 564
 565 Wlarger-than-
 566 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
 567
 568 Wlarger-than=
 569 Common RejectNegative Joined UInteger Warning
 570 -Wlarger-than=<number>  Warn if an object is larger than <number> bytes
 571
 572 Wunsafe-loop-optimizations
 573 Common Var(warn_unsafe_loop_optimizations) Warning
 574 Warn if the loop cannot be optimized due to nontrivial assumptions.
 575
 576 Wmissing-noreturn
 577 Common Alias(Wsuggest-attribute=noreturn)
 578
 579 Woverflow
 580 Common Var(warn_overflow) Init(1) Warning
 581 Warn about overflow in arithmetic expressions
 582
 583 Wpacked
 584 Common Var(warn_packed) Warning
 585 Warn when the packed attribute has no effect on struct layout
 586
 587 Wpadded
 588 Common Var(warn_padded) Warning
 589 Warn when padding is required to align structure members
 590
 591 Wpedantic
 592 Common Var(pedantic) Warning
 593 Issue warnings needed for strict compliance to the standard
 594
 595 Wshadow
 596 Common Var(warn_shadow) Warning
 597 Warn when one local variable shadows another
 598
 599 Wstack-protector
 600 Common Var(warn_stack_protect) Warning
 601 Warn when not issuing stack smashing protection for some reason
 602
 603 Wstack-usage=
 604 Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
 605 Warn if stack usage might be larger than specified amount
 606
 607 Wstrict-aliasing
 608 Common Warning
 609 Warn about code which might break strict aliasing rules
 610
 611 Wstrict-aliasing=
 612 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
 613 Warn about code which might break strict aliasing rules
 614
 615 Wstrict-overflow
 616 Common Warning
 617 Warn about optimizations that assume that signed overflow is undefined
 618
 619 Wstrict-overflow=
 620 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
 621 Warn about optimizations that assume that signed overflow is undefined
 622
 623 Wsuggest-attribute=const
 624 Common Var(warn_suggest_attribute_const) Warning
 625 Warn about functions which might be candidates for __attribute__((const))
 626
 627 Wsuggest-attribute=pure
 628 Common Var(warn_suggest_attribute_pure) Warning
 629 Warn about functions which might be candidates for __attribute__((pure))
 630
 631 Wsuggest-attribute=noreturn
 632 Common Var(warn_suggest_attribute_noreturn) Warning
 633 Warn about functions which might be candidates for __attribute__((noreturn))
 634
 635 Wsystem-headers
 636 Common Var(warn_system_headers) Warning
 637 Do not suppress warnings from system headers
 638
 639 Wtrampolines
 640 Common Var(warn_trampolines) Warning
 641 Warn whenever a trampoline is generated
 642
 643 Wtype-limits
 644 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
 645 Warn if a comparison is always true or always false due to the limited range of the data type
 646
 647 Wuninitialized
 648 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
 649 Warn about uninitialized automatic variables
 650
 651 Wmaybe-uninitialized
 652 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
 653 Warn about maybe uninitialized automatic variables
 654
 655 Wunreachable-code
 656 Common Ignore
 657 Does nothing. Preserved for backward compatibility.
 658
 659 Wunused
 660 Common Var(warn_unused) Init(0) Warning
 661 Enable all -Wunused- warnings
 662
 663 Wunused-but-set-parameter
 664 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
 665 Warn when a function parameter is only set, otherwise unused
 666
 667 Wunused-but-set-variable
 668 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
 669 Warn when a variable is only set, otherwise unused
 670
 671 Wunused-function
 672 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
 673 Warn when a function is unused
 674
 675 Wunused-label
 676 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
 677 Warn when a label is unused
 678
 679 Wunused-parameter
 680 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
 681 Warn when a function parameter is unused
 682
 683 Wunused-value
 684 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
 685 Warn when an expression value is unused
 686
 687 Wunused-variable
 688 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
 689 Warn when a variable is unused
 690
 691 Wcoverage-mismatch
 692 Common Var(warn_coverage_mismatch) Init(1) Warning
 693 Warn in case profiles in -fprofile-use do not match
 694
 695 Wvector-operation-performance
 696 Common Var(warn_vector_operation_performance) Warning
 697 Warn when a vector operation is compiled outside the SIMD
 698
 699 Xassembler
 700 Driver Separate
 701
 702 Xlinker
 703 Driver Separate
 704
 705 Xpreprocessor
 706 Driver Separate
 707
 708 Z
 709 Driver
 710
 711 aux-info
 712 Common Separate Var(aux_info_file_name)
 713 -aux-info <file>        Emit declaration information into <file>
 714
 715 aux-info=
 716 Common Joined Alias(aux-info)
 717
 718 auxbase
 719 Common Separate RejectDriver Var(aux_base_name)
 720
 721 auxbase-strip
 722 Common Separate RejectDriver
 723
 724 coverage
 725 Driver
 726
 727 c
 728 Driver
 729
 730 d
 731 Common Joined
 732 -d<letters>     Enable dumps from specific passes of the compiler
 733
 734 dumpbase
 735 Common Separate Var(dump_base_name)
 736 -dumpbase <file>        Set the file basename to be used for dumps
 737
 738 dumpdir
 739 Common Separate Var(dump_dir_name)
 740 -dumpdir <dir>  Set the directory name to be used for dumps
 741
 742 dumpmachine
 743 Driver
 744
 745 dumpspecs
 746 Driver
 747
 748 dumpversion
 749 Driver
 750
 751 e
 752 Driver Joined Separate
 753
 754 ; This option has historically been passed down to the linker by an
 755 ; accident of a %{e*} spec, so ensure it continues to be passed down
 756 ; as a single option.  The supported option for this purpose is
 757 ; -rdynamic.  See PR 47390.
 758 export-dynamic
 759 Driver Undocumented
 760
 761 ; The version of the C++ ABI in use.  The following values are allowed:
 762 ;
 763 ; 0: The version of the ABI believed most conformant with the C++ ABI
 764 ;    specification.  This ABI may change as bugs are discovered and fixed.
 765 ;    Therefore, 0 will not necessarily indicate the same ABI in different
 766 ;    versions of G++.
 767 ;
 768 ; 1: The version of the ABI first used in G++ 3.2.
 769 ;
 770 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
 771 ;
 772 ; 3: The version of the ABI that fixes the missing underscore
 773 ;    in template non-type arguments of pointer type.
 774 ;
 775 ; 4: The version of the ABI that introduces unambiguous mangling of
 776 ;    vector types.  First selectable in G++ 4.5.
 777 ;
 778 ; 5: The version of the ABI that ignores attribute const/noreturn
 779 ;    in function pointer mangling, and corrects mangling of decltype and
 780 ;    function parameters used in other parameters and the return type.
 781 ;    First selectable in G++ 4.6.
 782 ;
 783 ; 6: The version of the ABI that doesn't promote scoped enums to int and
 784 ;    changes the mangling of template argument packs, const/static_cast,
 785 ;    prefix ++ and --, and a class scope function used as a template
 786 ;    argument.
 787 ;    First selectable in G++ 4.7.
 788 ;
 789 ; 7: The version of the ABI that treats nullptr_t as a builtin type.
 790 ;    First selectable in G++ 4.8.
 791 ; Additional positive integers will be assigned as new versions of
 792 ; the ABI become the default version of the ABI.
 793 fabi-version=
 794 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(2)
 795
 796 falign-functions
 797 Common Report Var(align_functions,0) Optimization UInteger
 798 Align the start of functions
 799
 800 falign-functions=
 801 Common RejectNegative Joined UInteger Var(align_functions)
 802
 803 falign-jumps
 804 Common Report Var(align_jumps,0) Optimization UInteger
 805 Align labels which are only reached by jumping
 806
 807 falign-jumps=
 808 Common RejectNegative Joined UInteger Var(align_jumps)
 809
 810 falign-labels
 811 Common Report Var(align_labels,0) Optimization UInteger
 812 Align all labels
 813
 814 falign-labels=
 815 Common RejectNegative Joined UInteger Var(align_labels)
 816
 817 falign-loops
 818 Common Report Var(align_loops,0) Optimization UInteger
 819 Align the start of loops
 820
 821 falign-loops=
 822 Common RejectNegative Joined UInteger Var(align_loops)
 823
 824 fargument-alias
 825 Common Ignore
 826 Does nothing. Preserved for backward compatibility.
 827
 828 fargument-noalias
 829 Common Ignore
 830 Does nothing. Preserved for backward compatibility.
 831
 832 fargument-noalias-global
 833 Common Ignore
 834 Does nothing. Preserved for backward compatibility.
 835
 836 fargument-noalias-anything
 837 Common Ignore
 838 Does nothing. Preserved for backward compatibility.
 839
 840 fsanitize=address
 841 Common Report Var(flag_asan)
 842 Enable AddressSanitizer, a memory error detector
 843
 844 fsanitize=thread
 845 Common Report Var(flag_tsan)
 846 Enable ThreadSanitizer, a data race detector
 847
 848 fasynchronous-unwind-tables
 849 Common Report Var(flag_asynchronous_unwind_tables) Optimization
 850 Generate unwind tables that are exact at each instruction boundary
 851
 852 fauto-inc-dec
 853 Common Report Var(flag_auto_inc_dec) Init(1)
 854 Generate auto-inc/dec instructions
 855
 856 ; -fcheck-bounds causes gcc to generate array bounds checks.
 857 ; For C, C++ and ObjC: defaults off.
 858 ; For Java: defaults to on.
 859 ; For Fortran: defaults to off.
 860 fbounds-check
 861 Common Report Var(flag_bounds_check)
 862 Generate code to check bounds before indexing arrays
 863
 864 fbranch-count-reg
 865 Common Report Var(flag_branch_on_count_reg) Init(1) Optimization
 866 Replace add, compare, branch with branch on count register
 867
 868 fbranch-probabilities
 869 Common Report Var(flag_branch_probabilities) Optimization
 870 Use profiling information for branch probabilities
 871
 872 fbranch-target-load-optimize
 873 Common Report Var(flag_branch_target_load_optimize) Optimization
 874 Perform branch target load optimization before prologue / epilogue threading
 875
 876 fbranch-target-load-optimize2
 877 Common Report Var(flag_branch_target_load_optimize2) Optimization
 878 Perform branch target load optimization after prologue / epilogue threading
 879
 880 fbtr-bb-exclusive
 881 Common Report Var(flag_btr_bb_exclusive) Optimization
 882 Restrict target load migration not to re-use registers in any basic block
 883
 884 fcall-saved-
 885 Common Joined RejectNegative Var(common_deferred_options) Defer
 886 -fcall-saved-<register> Mark <register> as being preserved across functions
 887
 888 fcall-used-
 889 Common Joined RejectNegative Var(common_deferred_options) Defer
 890 -fcall-used-<register>  Mark <register> as being corrupted by function calls
 891
 892 ; Nonzero for -fcaller-saves: allocate values in regs that need to
 893 ; be saved across function calls, if that produces overall better code.
 894 ; Optional now, so people can test it.
 895 fcaller-saves
 896 Common Report Var(flag_caller_saves) Optimization
 897 Save registers around function calls
 898
 899 fcheck-data-deps
 900 Common Report Var(flag_check_data_deps)
 901 Compare the results of several data dependence analyzers.
 902
 903 fcombine-stack-adjustments
 904 Common Report Var(flag_combine_stack_adjustments) Optimization
 905 Looks for opportunities to reduce stack adjustments and stack references.
 906
 907 fcommon
 908 Common Report Var(flag_no_common,0) Optimization
 909 Do not put uninitialized globals in the common section
 910
 911 fcompare-debug
 912 Driver
 913 ; Converted by the driver to -fcompare-debug= options.
 914
 915 fcompare-debug=
 916 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
 917 -fcompare-debug[=<opts>]        Compile with and without e.g. -gtoggle, and compare the final-insns dump
 918
 919 fcompare-debug-second
 920 Common Driver RejectNegative Var(flag_compare_debug)
 921 Run only the second compilation of -fcompare-debug
 922
 923 fcompare-elim
 924 Common Report Var(flag_compare_elim_after_reload) Optimization
 925 Perform comparison elimination after register allocation has finished
 926
 927 fconserve-stack
 928 Common Var(flag_conserve_stack) Optimization
 929 Do not perform optimizations increasing noticeably stack usage
 930
 931 fcprop-registers
 932 Common Report Var(flag_cprop_registers) Optimization
 933 Perform a register copy-propagation optimization pass
 934
 935 fcrossjumping
 936 Common Report Var(flag_crossjumping) Optimization
 937 Perform cross-jumping optimization
 938
 939 fcse-follow-jumps
 940 Common Report Var(flag_cse_follow_jumps) Optimization
 941 When running CSE, follow jumps to their targets
 942
 943 fcse-skip-blocks
 944 Common Ignore
 945 Does nothing.  Preserved for backward compatibility.
 946
 947 fcx-limited-range
 948 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
 949 Omit range reduction step when performing complex division
 950
 951 fcx-fortran-rules
 952 Common Report Var(flag_cx_fortran_rules) Optimization
 953 Complex multiplication and division follow Fortran rules
 954
 955 fdata-sections
 956 Common Report Var(flag_data_sections) Optimization
 957 Place data items into their own section
 958
 959 fdbg-cnt-list
 960 Common Report Var(common_deferred_options) Defer
 961 List all available debugging counters with their limits and counts.
 962
 963 fdbg-cnt=
 964 Common RejectNegative Joined Var(common_deferred_options) Defer
 965 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...]     Set the debug counter limit.
 966
 967 fdebug-prefix-map=
 968 Common Joined RejectNegative Var(common_deferred_options) Defer
 969 Map one directory name to another in debug information
 970
 971 fdebug-types-section
 972 Common Report Var(flag_debug_types_section) Init(0)
 973 Output .debug_types section when using DWARF v4 debuginfo.
 974
 975 ; Nonzero for -fdefer-pop: don't pop args after each function call
 976 ; instead save them up to pop many calls' args with one insns.
 977 fdefer-pop
 978 Common Report Var(flag_defer_pop) Optimization
 979 Defer popping functions args from stack until later
 980
 981 fdelayed-branch
 982 Common Report Var(flag_delayed_branch) Optimization
 983 Attempt to fill delay slots of branch instructions
 984
 985 fdelete-dead-exceptions
 986 Common Report Var(flag_delete_dead_exceptions) Init(0)
 987 Delete dead instructions that may throw exceptions
 988
 989 fdelete-null-pointer-checks
 990 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
 991 Delete useless null pointer checks
 992
 993 fdevirtualize
 994 Common Report Var(flag_devirtualize) Optimization
 995 Try to convert virtual calls to direct ones.
 996
 997 fdiagnostics-show-location=
 998 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
 999 -fdiagnostics-show-location=[once|every-line]   How often to emit source location at the beginning of line-wrapped diagnostics
1000
1001 ; Required for these enum values.
1002 SourceInclude
1003 pretty-print.h
1004
1005 Enum
1006 Name(diagnostic_prefixing_rule) Type(int)
1007
1008 EnumValue
1009 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1010
1011 EnumValue
1012 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1013
1014 fdiagnostics-show-caret
1015 Common Var(flag_diagnostics_show_caret) Init(1)
1016 Show the source line with a caret indicating the column
1017
1018 fdiagnostics-show-option
1019 Common Var(flag_diagnostics_show_option) Init(1)
1020 Amend appropriate diagnostic messages with the command line option that controls them
1021
1022 fdisable-
1023 Common Joined RejectNegative Var(common_deferred_options) Defer
1024 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1025
1026 fenable-
1027 Common Joined RejectNegative Var(common_deferred_options) Defer
1028 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1029
1030 fdump-
1031 Common Joined RejectNegative Var(common_deferred_options) Defer
1032 -fdump-<type>   Dump various compiler internals to a file
1033
1034 fdump-final-insns
1035 Driver RejectNegative
1036
1037 fdump-final-insns=
1038 Common RejectNegative Joined Var(flag_dump_final_insns)
1039 -fdump-final-insns=filename     Dump to filename the insns at the end of translation
1040
1041 fdump-go-spec=
1042 Common RejectNegative Joined Var(flag_dump_go_spec)
1043 -fdump-go-spec=filename Write all declarations to file as Go code
1044
1045 fdump-noaddr
1046 Common Report Var(flag_dump_noaddr)
1047 Suppress output of addresses in debugging dumps
1048
1049 fdump-passes
1050 Common Var(flag_dump_passes) Init(0)
1051 Dump optimization passes
1052
1053 fdump-unnumbered
1054 Common Report Var(flag_dump_unnumbered)
1055 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1056
1057 fdump-unnumbered-links
1058 Common Report Var(flag_dump_unnumbered_links)
1059 Suppress output of previous and next insn numbers in debugging dumps
1060
1061 fdwarf2-cfi-asm
1062 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1063 Enable CFI tables via GAS assembler directives.
1064
1065 fearly-inlining
1066 Common Report Var(flag_early_inlining) Init(1) Optimization
1067 Perform early inlining
1068
1069 feliminate-dwarf2-dups
1070 Common Report Var(flag_eliminate_dwarf2_dups)
1071 Perform DWARF2 duplicate elimination
1072
1073 fipa-sra
1074 Common Report Var(flag_ipa_sra) Init(0) Optimization
1075 Perform interprocedural reduction of aggregates
1076
1077 feliminate-unused-debug-symbols
1078 Common Report Var(flag_debug_only_used_symbols)
1079 Perform unused type elimination in debug info
1080
1081 feliminate-unused-debug-types
1082 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1083 Perform unused type elimination in debug info
1084
1085 femit-class-debug-always
1086 Common Report Var(flag_emit_class_debug_always) Init(0)
1087 Do not suppress C++ class debug information.
1088
1089 fexceptions
1090 Common Report Var(flag_exceptions) Optimization
1091 Enable exception handling
1092
1093 fexpensive-optimizations
1094 Common Report Var(flag_expensive_optimizations) Optimization
1095 Perform a number of minor, expensive optimizations
1096
1097 fexcess-precision=
1098 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1099 -fexcess-precision=[fast|standard]      Specify handling of excess floating-point precision
1100
1101 Enum
1102 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1103
1104 EnumValue
1105 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1106
1107 EnumValue
1108 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1109
1110 ffast-math
1111 Common
1112
1113 ffat-lto-objects
1114 Common Var(flag_fat_lto_objects) Init(1)
1115 Output lto objects containing both the intermediate language and binary output.
1116
1117 ffinite-math-only
1118 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1119 Assume no NaNs or infinities are generated
1120
1121 ffixed-
1122 Common Joined RejectNegative Var(common_deferred_options) Defer
1123 -ffixed-<register>      Mark <register> as being unavailable to the compiler
1124
1125 ffloat-store
1126 Common Report Var(flag_float_store) Optimization
1127 Don't allocate floats and doubles in extended-precision registers
1128
1129 fforce-addr
1130 Common Ignore
1131 Does nothing.  Preserved for backward compatibility.
1132
1133 fforward-propagate
1134 Common Report Var(flag_forward_propagate) Optimization
1135 Perform a forward propagation pass on RTL
1136
1137 ffp-contract=
1138 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1139 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1140
1141 Enum
1142 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1143
1144 EnumValue
1145 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1146
1147 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1148 EnumValue
1149 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1150
1151 EnumValue
1152 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1153
1154 ; Nonzero means don't put addresses of constant functions in registers.
1155 ; Used for compiling the Unix kernel, where strange substitutions are
1156 ; done on the assembly output.
1157 ffunction-cse
1158 Common Report Var(flag_no_function_cse,0)
1159 Allow function addresses to be held in registers
1160
1161 ffunction-sections
1162 Common Report Var(flag_function_sections)
1163 Place each function into its own section
1164
1165 fgcse
1166 Common Report Var(flag_gcse) Optimization
1167 Perform global common subexpression elimination
1168
1169 fgcse-lm
1170 Common Report Var(flag_gcse_lm) Init(1) Optimization
1171 Perform enhanced load motion during global common subexpression elimination
1172
1173 fgcse-sm
1174 Common Report Var(flag_gcse_sm) Init(0) Optimization
1175 Perform store motion after global common subexpression elimination
1176
1177 fgcse-las
1178 Common Report Var(flag_gcse_las) Init(0) Optimization
1179 Perform redundant load after store elimination in global common subexpression
1180 elimination
1181
1182 fgcse-after-reload
1183 Common Report Var(flag_gcse_after_reload) Optimization
1184 Perform global common subexpression elimination after register allocation
1185 has finished
1186
1187 ; This option is not documented yet as its semantics will change.
1188 fgraphite
1189 Common Report Var(flag_graphite)
1190 Enable in and out of Graphite representation
1191
1192 fgraphite-identity
1193 Common Report Var(flag_graphite_identity) Optimization
1194 Enable Graphite Identity transformation
1195
1196 fhoist-adjacent-loads
1197 Common Report Var(flag_hoist_adjacent_loads) Optimization
1198 Enable hoisting adjacent loads to encourage generating conditional move
1199 instructions
1200
1201 floop-parallelize-all
1202 Common Report Var(flag_loop_parallelize_all) Optimization
1203 Mark all loops as parallel
1204
1205 floop-strip-mine
1206 Common Report Var(flag_loop_strip_mine) Optimization
1207 Enable Loop Strip Mining transformation
1208
1209 floop-interchange
1210 Common Report Var(flag_loop_interchange) Optimization
1211 Enable Loop Interchange transformation
1212
1213 floop-block
1214 Common Report Var(flag_loop_block) Optimization
1215 Enable Loop Blocking transformation
1216
1217 fgnu-tm
1218 Common Report Var(flag_tm)
1219 Enable support for GNU transactional memory
1220
1221 floop-flatten
1222 Common Ignore
1223 Does nothing. Preserved for backward compatibility.
1224
1225 floop-nest-optimize
1226 Common Report Var(flag_loop_optimize_isl) Optimization
1227 Enable the ISL based loop nest optimizer
1228
1229 fstrict-volatile-bitfields
1230 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1231 Force bitfield accesses to match their type width
1232
1233 fguess-branch-probability
1234 Common Report Var(flag_guess_branch_prob) Optimization
1235 Enable guessing of branch probabilities
1236
1237 ; Nonzero means ignore `#ident' directives.  0 means handle them.
1238 ; Generate position-independent code for executables if possible
1239 ; On SVR4 targets, it also controls whether or not to emit a
1240 ; string identifying the compiler.
1241 fident
1242 Common Report Var(flag_no_ident,0)
1243 Process #ident directives
1244
1245 fif-conversion
1246 Common Report Var(flag_if_conversion) Optimization
1247 Perform conversion of conditional jumps to branchless equivalents
1248
1249 fif-conversion2
1250 Common Report Var(flag_if_conversion2) Optimization
1251 Perform conversion of conditional jumps to conditional execution
1252
1253 fstack-reuse=
1254 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1255 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1256
1257 Enum
1258 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1259
1260 EnumValue
1261 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1262
1263 EnumValue
1264 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1265
1266 EnumValue
1267 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1268
1269 ftree-loop-if-convert
1270 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1271 Convert conditional jumps in innermost loops to branchless equivalents
1272
1273 ftree-loop-if-convert-stores
1274 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1275 Also if-convert conditional jumps containing memory writes
1276
1277 ; -finhibit-size-directive inhibits output of .size for ELF.
1278 ; This is used only for compiling crtstuff.c,
1279 ; and it may be extended to other effects
1280 ; needed for crtstuff.c on other systems.
1281 finhibit-size-directive
1282 Common Report Var(flag_inhibit_size_directive)
1283 Do not generate .size directives
1284
1285 findirect-inlining
1286 Common Report Var(flag_indirect_inlining)
1287 Perform indirect inlining
1288
1289 ; General flag to enable inlining.  Specifying -fno-inline will disable
1290 ; all inlining apart from always-inline functions.
1291 finline
1292 Common Report Var(flag_no_inline,0) Init(0) Optimization
1293 Enable inlining of function declared \"inline\", disabling disables all inlining
1294
1295 finline-small-functions
1296 Common Report Var(flag_inline_small_functions) Optimization
1297 Integrate functions into their callers when code size is known not to grow
1298
1299 finline-functions
1300 Common Report Var(flag_inline_functions) Optimization
1301 Integrate functions not declared \"inline\" into their callers when profitable
1302
1303 finline-functions-called-once
1304 Common Report Var(flag_inline_functions_called_once) Optimization
1305 Integrate functions only required by their single caller
1306
1307 finline-limit-
1308 Common RejectNegative Joined Alias(finline-limit=)
1309
1310 finline-limit=
1311 Common RejectNegative Joined UInteger
1312 -finline-limit=<number> Limit the size of inlined functions to <number>
1313
1314 finline-atomics
1315 Common Report Var(flag_inline_atomics) Init(1) Optimization
1316 Inline __atomic operations when a lock free instruction sequence is available.
1317
1318 finstrument-functions
1319 Common Report Var(flag_instrument_function_entry_exit)
1320 Instrument function entry and exit with profiling calls
1321
1322 finstrument-functions-exclude-function-list=
1323 Common RejectNegative Joined
1324 -finstrument-functions-exclude-function-list=name,...  Do not instrument listed functions
1325
1326 finstrument-functions-exclude-file-list=
1327 Common RejectNegative Joined
1328 -finstrument-functions-exclude-file-list=filename,...  Do not instrument functions listed in files
1329
1330 fipa-cp
1331 Common Report Var(flag_ipa_cp) Optimization
1332 Perform Interprocedural constant propagation
1333
1334 fipa-cp-clone
1335 Common Report Var(flag_ipa_cp_clone) Optimization
1336 Perform cloning to make Interprocedural constant propagation stronger
1337
1338 fipa-profile
1339 Common Report Var(flag_ipa_profile) Init(0) Optimization
1340 Perform interprocedural profile propagation
1341
1342 fipa-pta
1343 Common Report Var(flag_ipa_pta) Init(0) Optimization
1344 Perform interprocedural points-to analysis
1345
1346 fipa-pure-const
1347 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1348 Discover pure and const functions
1349
1350 fipa-reference
1351 Common Report Var(flag_ipa_reference) Init(0) Optimization
1352 Discover readonly and non addressable static variables
1353
1354 fipa-matrix-reorg
1355 Common Ignore
1356 Does nothing. Preserved for backward compatibility.
1357
1358 fipa-struct-reorg
1359 Common Ignore
1360 Does nothing. Preserved for backward compatibility.
1361
1362 fira-algorithm=
1363 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1364 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1365
1366 Enum
1367 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1368
1369 EnumValue
1370 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1371
1372 EnumValue
1373 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1374
1375 fira-region=
1376 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1377 -fira-region=[one|all|mixed] Set regions for IRA
1378
1379 Enum
1380 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1381
1382 EnumValue
1383 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1384
1385 EnumValue
1386 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1387
1388 EnumValue
1389 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1390
1391 fira-hoist-pressure
1392 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1393 Use IRA based register pressure calculation
1394 in RTL hoist optimizations.
1395
1396 fira-loop-pressure
1397 Common Report Var(flag_ira_loop_pressure)
1398 Use IRA based register pressure calculation
1399 in RTL loop optimizations.
1400
1401 fira-share-save-slots
1402 Common Report Var(flag_ira_share_save_slots) Init(1)
1403 Share slots for saving different hard registers.
1404
1405 fira-share-spill-slots
1406 Common Report Var(flag_ira_share_spill_slots) Init(1)
1407 Share stack slots for spilled pseudo-registers.
1408
1409 fira-verbose=
1410 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1411 -fira-verbose=<number>  Control IRA's level of diagnostic messages.
1412
1413 fivopts
1414 Common Report Var(flag_ivopts) Init(1) Optimization
1415 Optimize induction variables on trees
1416
1417 fjump-tables
1418 Common Var(flag_jump_tables) Init(1) Optimization
1419 Use jump tables for sufficiently large switch statements
1420
1421 fkeep-inline-functions
1422 Common Report Var(flag_keep_inline_functions)
1423 Generate code for functions even if they are fully inlined
1424
1425 fkeep-static-consts
1426 Common Report Var(flag_keep_static_consts) Init(1)
1427 Emit static const variables even if they are not used
1428
1429 fleading-underscore
1430 Common Report Var(flag_leading_underscore) Init(-1)
1431 Give external symbols a leading underscore
1432
1433 floop-optimize
1434 Common Ignore
1435 Does nothing.  Preserved for backward compatibility.
1436
1437 flto
1438 Common
1439 Enable link-time optimization.
1440
1441 flto=
1442 Common RejectNegative Joined Var(flag_lto)
1443 Link-time optimization with number of parallel jobs or jobserver.
1444
1445 flto-partition=1to1
1446 Common Var(flag_lto_partition_1to1)
1447 Partition symbols and vars at linktime based on object files they originate from
1448
1449 flto-partition=balanced
1450 Common Var(flag_lto_partition_balanced)
1451 Partition functions and vars at linktime into approximately same sized buckets
1452
1453 flto-partition=max
1454 Common Var(flag_lto_partition_max)
1455 Put every symbol into separate partition
1456
1457 flto-partition=none
1458 Common Var(flag_lto_partition_none)
1459 Disable partioning and streaming
1460
1461 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1462 flto-compression-level=
1463 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1464 -flto-compression-level=<number>        Use zlib compression level <number> for IL
1465
1466 flto-report
1467 Common Report Var(flag_lto_report) Init(0)
1468 Report various link-time optimization statistics
1469
1470 fmath-errno
1471 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1472 Set errno after built-in math functions
1473
1474 fmax-errors=
1475 Common Joined RejectNegative UInteger Var(flag_max_errors)
1476 -fmax-errors=<number>   Maximum number of errors to report
1477
1478 fmem-report
1479 Common Report Var(mem_report)
1480 Report on permanent memory allocation
1481
1482 fmem-report-wpa
1483 Common Report Var(mem_report_wpa)
1484 Report on permanent memory allocation in WPA only
1485
1486 ; This will attempt to merge constant section constants, if 1 only
1487 ; string constants and constants from constant pool, if 2 also constant
1488 ; variables.
1489 fmerge-all-constants
1490 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1491 Attempt to merge identical constants and constant variables
1492
1493 fmerge-constants
1494 Common Report Var(flag_merge_constants,1) Optimization
1495 Attempt to merge identical constants across compilation units
1496
1497 fmerge-debug-strings
1498 Common Report Var(flag_merge_debug_strings) Init(1)
1499 Attempt to merge identical debug strings across compilation units
1500
1501 fmessage-length=
1502 Common RejectNegative Joined UInteger
1503 -fmessage-length=<number>       Limit diagnostics to <number> characters per line.  0 suppresses line-wrapping
1504
1505 fmodulo-sched
1506 Common Report Var(flag_modulo_sched) Optimization
1507 Perform SMS based modulo scheduling before the first scheduling pass
1508
1509 fmodulo-sched-allow-regmoves
1510 Common Report Var(flag_modulo_sched_allow_regmoves)
1511 Perform SMS based modulo scheduling with register moves allowed
1512
1513 fmove-loop-invariants
1514 Common Report Var(flag_move_loop_invariants) Init(1) Optimization
1515 Move loop invariant computations out of loops
1516
1517 fdce
1518 Common Var(flag_dce) Init(1) Optimization
1519 Use the RTL dead code elimination pass
1520
1521 fdse
1522 Common Var(flag_dse) Init(1) Optimization
1523 Use the RTL dead store elimination pass
1524
1525 freschedule-modulo-scheduled-loops
1526 Common Report Var(flag_resched_modulo_sched) Optimization
1527 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1528
1529 fnon-call-exceptions
1530 Common Report Var(flag_non_call_exceptions) Optimization
1531 Support synchronous non-call exceptions
1532
1533 fomit-frame-pointer
1534 Common Report Var(flag_omit_frame_pointer) Optimization
1535 When possible do not generate stack frames
1536
1537 fopt-info
1538 Common Report Var(flag_opt_info) Optimization
1539 Enable all optimization info dumps on stderr
1540
1541 fopt-info-
1542 Common Joined RejectNegative Var(common_deferred_options) Defer
1543 -fopt-info[-<type>=filename]    Dump compiler optimization details
1544
1545 foptimize-register-move
1546 Common Report Var(flag_regmove) Optimization
1547 Do the full register move optimization pass
1548
1549 foptimize-sibling-calls
1550 Common Report Var(flag_optimize_sibling_calls) Optimization
1551 Optimize sibling and tail recursive calls
1552
1553 fpartial-inlining
1554 Common Report Var(flag_partial_inlining)
1555 Perform partial inlining
1556
1557 fpre-ipa-mem-report
1558 Common Report Var(pre_ipa_mem_report)
1559 Report on memory allocation before interprocedural optimization
1560
1561 fpost-ipa-mem-report
1562 Common Report Var(post_ipa_mem_report)
1563 Report on memory allocation before interprocedural optimization
1564
1565 fpack-struct
1566 Common Report Var(flag_pack_struct) Optimization
1567 Pack structure members together without holes
1568
1569 fpack-struct=
1570 Common RejectNegative Joined UInteger Optimization
1571 -fpack-struct=<number>  Set initial maximum structure member alignment
1572
1573 fpcc-struct-return
1574 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1575 Return small aggregates in memory, not registers
1576
1577 fpeel-loops
1578 Common Report Var(flag_peel_loops) Optimization
1579 Perform loop peeling
1580
1581 fpeephole
1582 Common Report Var(flag_no_peephole,0) Optimization
1583 Enable machine specific peephole optimizations
1584
1585 fpeephole2
1586 Common Report Var(flag_peephole2) Optimization
1587 Enable an RTL peephole pass before sched2
1588
1589 fPIC
1590 Common Report Var(flag_pic,2) Negative(fPIE)
1591 Generate position-independent code if possible (large mode)
1592
1593 fPIE
1594 Common Report Var(flag_pie,2) Negative(fpic)
1595 Generate position-independent code for executables if possible (large mode)
1596
1597 fpic
1598 Common Report Var(flag_pic,1) Negative(fpie)
1599 Generate position-independent code if possible (small mode)
1600
1601 fpie
1602 Common Report Var(flag_pie,1) Negative(fPIC)
1603 Generate position-independent code for executables if possible (small mode)
1604
1605 fplugin=
1606 Common Joined RejectNegative Var(common_deferred_options) Defer
1607 Specify a plugin to load
1608
1609 fplugin-arg-
1610 Common Joined RejectNegative Var(common_deferred_options) Defer
1611 -fplugin-arg-<name>-<key>[=<value>]     Specify argument <key>=<value> for plugin <name>
1612
1613 fpredictive-commoning
1614 Common Report Var(flag_predictive_commoning) Optimization
1615 Run predictive commoning optimization.
1616
1617 fprefetch-loop-arrays
1618 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1619 Generate prefetch instructions, if available, for arrays in loops
1620
1621 fprofile
1622 Common Report Var(profile_flag)
1623 Enable basic program profiling code
1624
1625 fprofile-arcs
1626 Common Report Var(profile_arc_flag)
1627 Insert arc-based program profiling code
1628
1629 fprofile-dir=
1630 Common Joined RejectNegative Var(profile_data_prefix)
1631 Set the top-level directory for storing the profile data.
1632 The default is 'pwd'.
1633
1634 fprofile-correction
1635 Common Report Var(flag_profile_correction)
1636 Enable correction of flow inconsistent profile data input
1637
1638 fprofile-generate
1639 Common
1640 Enable common options for generating profile info for profile feedback directed optimizations
1641
1642 fprofile-generate=
1643 Common Joined RejectNegative
1644 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1645
1646 fprofile-use
1647 Common Var(flag_profile_use)
1648 Enable common options for performing profile feedback directed optimizations
1649
1650 fprofile-use=
1651 Common Joined RejectNegative
1652 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1653
1654 fprofile-values
1655 Common Report Var(flag_profile_values)
1656 Insert code to profile values of expressions
1657
1658 fprofile-report
1659 Common Report Var(profile_report)
1660 Report on consistency of profile
1661
1662 frandom-seed
1663 Common Var(common_deferred_options) Defer
1664
1665 frandom-seed=
1666 Common Joined RejectNegative Var(common_deferred_options) Defer
1667 -frandom-seed=<string>  Make compile reproducible using <string>
1668
1669 ; This switch causes the command line that was used to create an
1670 ; object file to be recorded into the object file.  The exact format
1671 ; of this recording is target and binary file format dependent.
1672 ; It is related to the -fverbose-asm switch, but that switch only
1673 ; records information in the assembler output file as comments, so
1674 ; they never reach the object file.
1675 frecord-gcc-switches
1676 Common Report Var(flag_record_gcc_switches)
1677 Record gcc command line switches in the object file.
1678
1679 freg-struct-return
1680 Common Report Var(flag_pcc_struct_return,0) Optimization
1681 Return small aggregates in registers
1682
1683 fregmove
1684 Common Report Var(flag_regmove) Optimization
1685 Enables a register move optimization
1686
1687 frename-registers
1688 Common Report Var(flag_rename_registers) Init(2) Optimization
1689 Perform a register renaming optimization pass
1690
1691 freorder-blocks
1692 Common Report Var(flag_reorder_blocks) Optimization
1693 Reorder basic blocks to improve code placement
1694
1695 freorder-blocks-and-partition
1696 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1697 Reorder basic blocks and partition into hot and cold sections
1698
1699 freorder-functions
1700 Common Report Var(flag_reorder_functions) Optimization
1701 Reorder functions to improve code placement
1702
1703 frerun-cse-after-loop
1704 Common Report Var(flag_rerun_cse_after_loop) Optimization
1705 Add a common subexpression elimination pass after loop optimizations
1706
1707 frerun-loop-opt
1708 Common Ignore
1709 Does nothing.  Preserved for backward compatibility.
1710
1711 frounding-math
1712 Common Report Var(flag_rounding_math) Optimization SetByCombined
1713 Disable optimizations that assume default FP rounding behavior
1714
1715 fsched-interblock
1716 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1717 Enable scheduling across basic blocks
1718
1719 fsched-pressure
1720 Common Report Var(flag_sched_pressure) Init(0) Optimization
1721 Enable register pressure sensitive insn scheduling
1722
1723 fsched-spec
1724 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1725 Allow speculative motion of non-loads
1726
1727 fsched-spec-load
1728 Common Report Var(flag_schedule_speculative_load) Optimization
1729 Allow speculative motion of some loads
1730
1731 fsched-spec-load-dangerous
1732 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1733 Allow speculative motion of more loads
1734
1735 fsched-verbose=
1736 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1737 -fsched-verbose=<number>        Set the verbosity level of the scheduler
1738
1739 fsched2-use-superblocks
1740 Common Report Var(flag_sched2_use_superblocks) Optimization
1741 If scheduling post reload, do superblock scheduling
1742
1743 fsched2-use-traces
1744 Common Ignore
1745 Does nothing.  Preserved for backward compatibility.
1746
1747 fschedule-insns
1748 Common Report Var(flag_schedule_insns) Optimization
1749 Reschedule instructions before register allocation
1750
1751 fschedule-insns2
1752 Common Report Var(flag_schedule_insns_after_reload) Optimization
1753 Reschedule instructions after register allocation
1754
1755 ; This flag should be on when a target implements non-trivial
1756 ; scheduling hooks, maybe saving some information for its own sake.
1757 ; On IA64, for example, this is used for correct bundling.
1758 fselective-scheduling
1759 Common Report Var(flag_selective_scheduling) Optimization
1760 Schedule instructions using selective scheduling algorithm
1761
1762 fselective-scheduling2
1763 Common Report Var(flag_selective_scheduling2) Optimization
1764 Run selective scheduling after reload
1765
1766 fsel-sched-pipelining
1767 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1768 Perform software pipelining of inner loops during selective scheduling
1769
1770 fsel-sched-pipelining-outer-loops
1771 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1772 Perform software pipelining of outer loops during selective scheduling
1773
1774 fsel-sched-reschedule-pipelined
1775 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1776 Reschedule pipelined regions without pipelining
1777
1778 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1779 ; of stalled insns into the ready list.
1780 fsched-stalled-insns
1781 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1782 Allow premature scheduling of queued insns
1783
1784 fsched-stalled-insns=
1785 Common RejectNegative Joined UInteger
1786 -fsched-stalled-insns=<number>  Set number of queued insns that can be prematurely scheduled
1787
1788 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1789 ; be examined for a dependency on a stalled insn that is candidate for
1790 ; premature removal from the queue of stalled insns into the ready list (has
1791 ; an effect only if the flag 'sched_stalled_insns' is set).
1792 fsched-stalled-insns-dep
1793 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1794 Set dependence distance checking in premature scheduling of queued insns
1795
1796 fsched-stalled-insns-dep=
1797 Common RejectNegative Joined UInteger
1798 -fsched-stalled-insns-dep=<number>      Set dependence distance checking in premature scheduling of queued insns
1799
1800 fsched-group-heuristic
1801 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1802 Enable the group heuristic in the scheduler
1803
1804 fsched-critical-path-heuristic
1805 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1806 Enable the critical path heuristic in the scheduler
1807
1808 fsched-spec-insn-heuristic
1809 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1810 Enable the speculative instruction heuristic in the scheduler
1811
1812 fsched-rank-heuristic
1813 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1814 Enable the rank heuristic in the scheduler
1815
1816 fsched-last-insn-heuristic
1817 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1818 Enable the last instruction heuristic in the scheduler
1819
1820 fsched-dep-count-heuristic
1821 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1822 Enable the dependent count heuristic in the scheduler
1823
1824 fsection-anchors
1825 Common Report Var(flag_section_anchors) Optimization
1826 Access data in the same section from shared anchor points
1827
1828 fsee
1829 Common Ignore
1830 Does nothing.  Preserved for backward compatibility.
1831
1832 fzee
1833 Common Ignore
1834 Does nothing.  Preserved for backward compatibility.
1835
1836 free
1837 Common Report Var(flag_ree) Init(0)
1838 Turn on Redundant Extensions Elimination pass.
1839
1840 fshow-column
1841 Common Report Var(flag_show_column) Init(1)
1842 Show column numbers in diagnostics, when available.  Default on
1843
1844 fshrink-wrap
1845 Common Report Var(flag_shrink_wrap) Optimization
1846 Emit function prologues only before parts of the function that need it,
1847 rather than at the top of the function.
1848
1849 fsignaling-nans
1850 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1851 Disable optimizations observable by IEEE signaling NaNs
1852
1853 fsigned-zeros
1854 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1855 Disable floating point optimizations that ignore the IEEE signedness of zero
1856
1857 fsingle-precision-constant
1858 Common Report Var(flag_single_precision_constant) Optimization
1859 Convert floating point constants to single precision constants
1860
1861 fsplit-ivs-in-unroller
1862 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1863 Split lifetimes of induction variables when loops are unrolled
1864
1865 fsplit-stack
1866 Common Report Var(flag_split_stack) Init(-1)
1867 Generate discontiguous stack frames
1868
1869 fsplit-wide-types
1870 Common Report Var(flag_split_wide_types) Optimization
1871 Split wide types into independent registers
1872
1873 fvariable-expansion-in-unroller
1874 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1875 Apply variable expansion when loops are unrolled
1876
1877 fstack-check=
1878 Common Report RejectNegative Joined
1879 -fstack-check=[no|generic|specific]     Insert stack checking code into the program
1880
1881 fstack-check
1882 Common Alias(fstack-check=, specific, no)
1883 Insert stack checking code into the program.  Same as -fstack-check=specific
1884
1885 fstack-limit
1886 Common Var(common_deferred_options) Defer
1887
1888 fstack-limit-register=
1889 Common RejectNegative Joined Var(common_deferred_options) Defer
1890 -fstack-limit-register=<register>       Trap if the stack goes past <register>
1891
1892 fstack-limit-symbol=
1893 Common RejectNegative Joined Var(common_deferred_options) Defer
1894 -fstack-limit-symbol=<name>     Trap if the stack goes past symbol <name>
1895
1896 fstack-protector
1897 Common Report Var(flag_stack_protect, 1)
1898 Use propolice as a stack protection method
1899
1900 fstack-protector-all
1901 Common Report RejectNegative Var(flag_stack_protect, 2)
1902 Use a stack protection method for every function
1903
1904 fstack-usage
1905 Common RejectNegative Var(flag_stack_usage)
1906 Output stack usage information on a per-function basis
1907
1908 fstrength-reduce
1909 Common Ignore
1910 Does nothing.  Preserved for backward compatibility.
1911
1912 ; Nonzero if we should do (language-dependent) alias analysis.
1913 ; Typically, this analysis will assume that expressions of certain
1914 ; types do not alias expressions of certain other types.  Only used
1915 ; if alias analysis (in general) is enabled.
1916 fstrict-aliasing
1917 Common Report Var(flag_strict_aliasing) Optimization
1918 Assume strict aliasing rules apply
1919
1920 fstrict-overflow
1921 Common Report Var(flag_strict_overflow)
1922 Treat signed overflow as undefined
1923
1924 fsync-libcalls
1925 Common Report Var(flag_sync_libcalls) Init(1)
1926 Implement __atomic operations via libcalls to legacy __sync functions
1927
1928 fsyntax-only
1929 Common Report Var(flag_syntax_only)
1930 Check for syntax errors, then stop
1931
1932 ftest-coverage
1933 Common Report Var(flag_test_coverage)
1934 Create data files needed by \"gcov\"
1935
1936 fthread-jumps
1937 Common Report Var(flag_thread_jumps) Optimization
1938 Perform jump threading optimizations
1939
1940 ftime-report
1941 Common Report Var(time_report)
1942 Report the time taken by each compiler pass
1943
1944 ftls-model=
1945 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
1946 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec]      Set the default thread-local storage code generation model
1947
1948 Enum
1949 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
1950
1951 EnumValue
1952 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
1953
1954 EnumValue
1955 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
1956
1957 EnumValue
1958 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
1959
1960 EnumValue
1961 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
1962
1963 ftoplevel-reorder
1964 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
1965 Reorder top level functions, variables, and asms
1966
1967 ftracer
1968 Common Report Var(flag_tracer)
1969 Perform superblock formation via tail duplication
1970
1971 ; Zero means that floating-point math operations cannot generate a
1972 ; (user-visible) trap.  This is the case, for example, in nonstop
1973 ; IEEE 754 arithmetic.
1974 ftrapping-math
1975 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
1976 Assume floating-point operations can trap
1977
1978 ftrapv
1979 Common Report Var(flag_trapv) Optimization
1980 Trap for signed overflow in addition, subtraction and multiplication
1981
1982 ftree-ccp
1983 Common Report Var(flag_tree_ccp) Optimization
1984 Enable SSA-CCP optimization on trees
1985
1986 ftree-bit-ccp
1987 Common Report Var(flag_tree_bit_ccp) Optimization
1988 Enable SSA-BIT-CCP optimization on trees
1989
1990 ftree-store-ccp
1991 Common Ignore
1992 Does nothing.  Preserved for backward compatibility.
1993
1994 ftree-ch
1995 Common Report Var(flag_tree_ch) Optimization
1996 Enable loop header copying on trees
1997
1998 ftree-coalesce-inlined-vars
1999 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2000 Enable coalescing of copy-related user variables that are inlined
2001
2002 ftree-coalesce-vars
2003 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2004 Enable coalescing of all copy-related user variables
2005
2006 ftree-copyrename
2007 Common Report Var(flag_tree_copyrename) Optimization
2008 Replace SSA temporaries with better names in copies
2009
2010 ftree-copy-prop
2011 Common Report Var(flag_tree_copy_prop) Optimization
2012 Enable copy propagation on trees
2013
2014 ftree-store-copy-prop
2015 Common Ignore
2016 Does nothing.  Preserved for backward compatibility.
2017
2018 ftree-cselim
2019 Common Report Var(flag_tree_cselim) Init(2) Optimization
2020 Transform condition stores into unconditional ones
2021
2022 ftree-switch-conversion
2023 Common Report Var(flag_tree_switch_conversion) Optimization
2024 Perform conversions of switch initializations.
2025
2026 ftree-dce
2027 Common Report Var(flag_tree_dce) Optimization
2028 Enable SSA dead code elimination optimization on trees
2029
2030 ftree-dominator-opts
2031 Common Report Var(flag_tree_dom) Optimization
2032 Enable dominator optimizations
2033
2034 ftree-tail-merge
2035 Common Report Var(flag_tree_tail_merge) Optimization
2036 Enable tail merging on trees
2037
2038 ftree-dse
2039 Common Report Var(flag_tree_dse) Optimization
2040 Enable dead store elimination
2041
2042 ftree-forwprop
2043 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2044 Enable forward propagation on trees
2045
2046 ftree-fre
2047 Common Report Var(flag_tree_fre) Optimization
2048 Enable Full Redundancy Elimination (FRE) on trees
2049
2050 foptimize-strlen
2051 Common Report Var(flag_optimize_strlen) Optimization
2052 Enable string length optimizations on trees
2053
2054 ftree-loop-distribution
2055 Common Report Var(flag_tree_loop_distribution) Optimization
2056 Enable loop distribution on trees
2057
2058 ftree-loop-distribute-patterns
2059 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2060 Enable loop distribution for patterns transformed into a library call
2061
2062 ftree-loop-im
2063 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2064 Enable loop invariant motion on trees
2065
2066 ftree-loop-linear
2067 Common Alias(floop-interchange)
2068 Enable loop interchange transforms.  Same as -floop-interchange
2069
2070 ftree-loop-ivcanon
2071 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2072 Create canonical induction variables in loops
2073
2074 ftree-loop-optimize
2075 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2076 Enable loop optimizations on tree level
2077
2078 ftree-parallelize-loops=
2079 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2080 Enable automatic parallelization of loops
2081
2082 ftree-phiprop
2083 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2084 Enable hoisting loads from conditional pointers.
2085
2086 ftree-pre
2087 Common Report Var(flag_tree_pre) Optimization
2088 Enable SSA-PRE optimization on trees
2089
2090 ftree-partial-pre
2091 Common Report Var(flag_tree_partial_pre) Optimization
2092 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2093
2094 ftree-pta
2095 Common Report Var(flag_tree_pta) Init(1) Optimization
2096 Perform function-local points-to analysis on trees.
2097
2098 ftree-reassoc
2099 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2100 Enable reassociation on tree level
2101
2102 ftree-salias
2103 Common Ignore
2104 Does nothing.  Preserved for backward compatibility.
2105
2106 ftree-sink
2107 Common Report Var(flag_tree_sink) Optimization
2108 Enable SSA code sinking on trees
2109
2110 ftree-slsr
2111 Common Report Var(flag_tree_slsr) Optimization
2112 Perform straight-line strength reduction
2113
2114 ftree-sra
2115 Common Report Var(flag_tree_sra) Optimization
2116 Perform scalar replacement of aggregates
2117
2118 ftree-ter
2119 Common Report Var(flag_tree_ter) Optimization
2120 Replace temporary expressions in the SSA->normal pass
2121
2122 ftree-lrs
2123 Common Report Var(flag_tree_live_range_split) Optimization
2124 Perform live range splitting during the SSA->normal pass
2125
2126 ftree-vrp
2127 Common Report Var(flag_tree_vrp) Init(0) Optimization
2128 Perform Value Range Propagation on trees
2129
2130 funit-at-a-time
2131 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2132 Compile whole compilation unit at a time
2133
2134 funroll-loops
2135 Common Report Var(flag_unroll_loops) Optimization
2136 Perform loop unrolling when iteration count is known
2137
2138 funroll-all-loops
2139 Common Report Var(flag_unroll_all_loops) Optimization
2140 Perform loop unrolling for all loops
2141
2142 ; Nonzero means that loop optimizer may assume that the induction variables
2143 ; that control loops do not overflow and that the loops with nontrivial
2144 ; exit condition are not infinite
2145 funsafe-loop-optimizations
2146 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2147 Allow loop optimizations to assume that the loops behave in normal way
2148
2149 fassociative-math
2150 Common Report Var(flag_associative_math) SetByCombined
2151 Allow optimization for floating-point arithmetic which may change the
2152 result of the operation due to rounding.
2153
2154 freciprocal-math
2155 Common Report Var(flag_reciprocal_math) SetByCombined
2156 Same as -fassociative-math for expressions which include division.
2157
2158 ; Nonzero means that unsafe floating-point math optimizations are allowed
2159 ; for the sake of speed.  IEEE compliance is not guaranteed, and operations
2160 ; are allowed to assume that their arguments and results are "normal"
2161 ; (e.g., nonnegative for SQRT).
2162 funsafe-math-optimizations
2163 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2164 Allow math optimizations that may violate IEEE or ISO standards
2165
2166 funswitch-loops
2167 Common Report Var(flag_unswitch_loops) Optimization
2168 Perform loop unswitching
2169
2170 funwind-tables
2171 Common Report Var(flag_unwind_tables) Optimization
2172 Just generate unwind tables for exception handling
2173
2174 fuse-ld=bfd
2175 Common Negative(fuse-ld=gold)
2176 Use the bfd linker instead of the default linker
2177
2178 fuse-ld=gold
2179 Common Negative(fuse-ld=bfd)
2180 Use the gold linker instead of the default linker
2181
2182 fuse-linker-plugin
2183 Common Undocumented
2184
2185 ; Positive if we should track variables, negative if we should run
2186 ; the var-tracking pass only to discard debug annotations, zero if
2187 ; we're not to run it.  When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2188 ; will be set according to optimize, debug_info_level and debug_hooks
2189 ; in process_options ().
2190 fvar-tracking
2191 Common Report Var(flag_var_tracking) Init(2) Optimization
2192 Perform variable tracking
2193
2194 ; Positive if we should track variables at assignments, negative if
2195 ; we should run the var-tracking pass only to discard debug
2196 ; annotations.  When flag_var_tracking_assignments ==
2197 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2198 fvar-tracking-assignments
2199 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2200 Perform variable tracking by annotating assignments
2201
2202 ; Nonzero if we should toggle flag_var_tracking_assignments after
2203 ; processing options and computing its default.  */
2204 fvar-tracking-assignments-toggle
2205 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2206 Toggle -fvar-tracking-assignments
2207
2208 ; Positive if we should track uninitialized variables, negative if
2209 ; we should run the var-tracking pass only to discard debug
2210 ; annotations.  When flag_var_tracking_uninit == AUTODETECT_VALUE it
2211 ; will be set according to flag_var_tracking.
2212 fvar-tracking-uninit
2213 Common Report Var(flag_var_tracking_uninit) Optimization
2214 Perform variable tracking and also tag variables that are uninitialized
2215
2216 ftree-vectorize
2217 Common Report Var(flag_tree_vectorize) Optimization
2218 Enable loop vectorization on trees
2219
2220 ftree-vectorizer-verbose=
2221 Common RejectNegative Joined UInteger Var(common_deferred_options) Defer
2222 -ftree-vectorizer-verbose=<number>      This switch is deprecated. Use -fopt-info instead.
2223
2224 ftree-slp-vectorize
2225 Common Report Var(flag_tree_slp_vectorize) Init(2) Optimization
2226 Enable basic block vectorization (SLP) on trees
2227
2228 fvect-cost-model
2229 Common Report Var(flag_vect_cost_model) Optimization
2230 Enable use of cost model in vectorization
2231
2232 ftree-vect-loop-version
2233 Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization
2234 Enable loop versioning when doing loop vectorization on trees
2235
2236 ftree-scev-cprop
2237 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2238 Enable copy propagation of scalar-evolution information.
2239
2240 ; -fverbose-asm causes extra commentary information to be produced in
2241 ; the generated assembly code (to make it more readable).  This option
2242 ; is generally only of use to those who actually need to read the
2243 ; generated assembly code (perhaps while debugging the compiler itself).
2244 ; -fno-verbose-asm, the default, causes the extra information
2245 ; to not be added and is useful when comparing two assembler files.
2246 fverbose-asm
2247 Common Report Var(flag_verbose_asm)
2248 Add extra commentary to assembler output
2249
2250 fvisibility=
2251 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2252 -fvisibility=[default|internal|hidden|protected]        Set the default symbol visibility
2253
2254 Enum
2255 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2256
2257 EnumValue
2258 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2259
2260 EnumValue
2261 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2262
2263 EnumValue
2264 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2265
2266 EnumValue
2267 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2268
2269 fvpt
2270 Common Report Var(flag_value_profile_transformations) Optimization
2271 Use expression value profiles in optimizations
2272
2273 fweb
2274 Common Report Var(flag_web) Init(2) Optimization
2275 Construct webs and split unrelated uses of single variable
2276
2277 ftree-builtin-call-dce
2278 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2279 Enable conditional dead code elimination for builtin calls
2280
2281 fwhole-program
2282 Common Report Var(flag_whole_program) Init(0) Optimization
2283 Perform whole program optimizations
2284
2285 fwrapv
2286 Common Report Var(flag_wrapv) Optimization
2287 Assume signed arithmetic overflow wraps around
2288
2289 fzero-initialized-in-bss
2290 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2291 Put zero initialized data in the bss section
2292
2293 g
2294 Common JoinedOrMissing
2295 Generate debug information in default format
2296
2297 gcoff
2298 Common JoinedOrMissing Negative(gdwarf-)
2299 Generate debug information in COFF format
2300
2301 gdwarf-
2302 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2303 Generate debug information in DWARF v2 (or later) format
2304
2305 ggdb
2306 Common JoinedOrMissing
2307 Generate debug information in default extended format
2308
2309 gno-pubnames
2310 Common RejectNegative Var(debug_generate_pub_sections, 0) Init(-1)
2311 Don't generate DWARF pubnames and pubtypes sections.
2312
2313 gpubnames
2314 Common RejectNegative Var(debug_generate_pub_sections, 1)
2315 Generate DWARF pubnames and pubtypes sections.
2316
2317 gno-record-gcc-switches
2318 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2319 Don't record gcc command line switches in DWARF DW_AT_producer.
2320
2321 grecord-gcc-switches
2322 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2323 Record gcc command line switches in DWARF DW_AT_producer.
2324
2325 gno-split-dwarf
2326 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2327 Don't generate debug information in separate .dwo files
2328
2329 gsplit-dwarf
2330 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2331 Generate debug information in separate .dwo files
2332
2333 gstabs
2334 Common JoinedOrMissing Negative(gstabs+)
2335 Generate debug information in STABS format
2336
2337 gstabs+
2338 Common JoinedOrMissing Negative(gvms)
2339 Generate debug information in extended STABS format
2340
2341 gno-strict-dwarf
2342 Common RejectNegative Var(dwarf_strict,0) Init(0)
2343 Emit DWARF additions beyond selected version
2344
2345 gstrict-dwarf
2346 Common Report RejectNegative Var(dwarf_strict,1)
2347 Don't emit DWARF additions beyond selected version
2348
2349 gtoggle
2350 Common Report Var(flag_gtoggle)
2351 Toggle debug information generation
2352
2353 gvms
2354 Common JoinedOrMissing Negative(gxcoff)
2355 Generate debug information in VMS format
2356
2357 gxcoff
2358 Common JoinedOrMissing Negative(gxcoff+)
2359 Generate debug information in XCOFF format
2360
2361 gxcoff+
2362 Common JoinedOrMissing Negative(gcoff)
2363 Generate debug information in extended XCOFF format
2364
2365 h
2366 Driver Joined Separate
2367
2368 iplugindir=
2369 Common Joined Var(plugindir_string) Init(0)
2370 -iplugindir=<dir>       Set <dir> to be the default plugin directory
2371
2372 imultiarch
2373 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2374 -imultiarch <dir>       Set <dir> to be the multiarch include subdirectory
2375
2376 l
2377 Driver Joined Separate
2378
2379 n
2380 Driver
2381
2382 no-canonical-prefixes
2383 Driver
2384
2385 nodefaultlibs
2386 Driver
2387
2388 nostartfiles
2389 Driver
2390
2391 nostdlib
2392 Driver
2393
2394 o
2395 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2396 -o <file>       Place output into <file>
2397
2398 p
2399 Common Var(profile_flag)
2400 Enable function profiling
2401
2402 pass-exit-codes
2403 Driver Var(pass_exit_codes)
2404
2405 pedantic
2406 Common Alias(Wpedantic)
2407
2408 pedantic-errors
2409 Common Var(flag_pedantic_errors)
2410 Like -pedantic but issue them as errors
2411
2412 pg
2413 Driver
2414
2415 pipe
2416 Driver Var(use_pipes)
2417
2418 print-file-name=
2419 Driver JoinedOrMissing Var(print_file_name)
2420
2421 print-libgcc-file-name
2422 Driver
2423
2424 print-multi-directory
2425 Driver Var(print_multi_directory)
2426
2427 print-multi-lib
2428 Driver Var(print_multi_lib)
2429
2430 print-multi-os-directory
2431 Driver Var(print_multi_os_directory)
2432
2433 print-multiarch
2434 Driver Var(print_multiarch)
2435
2436 print-prog-name=
2437 Driver JoinedOrMissing Var(print_prog_name)
2438
2439 print-search-dirs
2440 Driver Var(print_search_dirs)
2441
2442 print-sysroot
2443 Driver Var(print_sysroot)
2444
2445 print-sysroot-headers-suffix
2446 Driver Var(print_sysroot_headers_suffix)
2447
2448 quiet
2449 Common Var(quiet_flag) RejectDriver
2450 Do not display functions compiled or elapsed time
2451
2452 r
2453 Driver
2454
2455 s
2456 Driver
2457
2458 save-temps
2459 Driver
2460
2461 save-temps=
2462 Driver Joined
2463
2464 t
2465 Driver
2466
2467 time
2468 Driver Var(report_times)
2469
2470 time=
2471 Driver JoinedOrMissing
2472
2473 u
2474 Driver Joined Separate
2475
2476 undef
2477 Driver
2478 ; C option, but driver must not handle as "-u ndef".
2479
2480 v
2481 Common Driver Var(verbose_flag)
2482 Enable verbose output
2483
2484 version
2485 Common Var(version_flag) RejectDriver
2486 Display the compiler's version
2487
2488 w
2489 Common Var(inhibit_warnings)
2490 Suppress warnings
2491
2492 wrapper
2493 Driver Separate Var(wrapper_string)
2494
2495 x
2496 Driver Joined Separate
2497
2498 shared
2499 Driver RejectNegative Negative(pie)
2500 Create a shared library
2501
2502 shared-libgcc
2503 Driver
2504
2505 specs
2506 Driver Separate Alias(specs=)
2507
2508 specs=
2509 Driver Joined
2510
2511 static
2512 Driver
2513
2514 static-libgcc
2515 Driver
2516
2517 static-libgfortran
2518 Driver
2519 ; Documented for Fortran, but always accepted by driver.
2520
2521 static-libstdc++
2522 Driver
2523
2524 static-libgo
2525 Driver
2526 ; Documented for Go, but always accepted by driver.
2527
2528 static-libasan
2529 Driver
2530
2531 static-libtsan
2532 Driver
2533
2534 symbolic
2535 Driver
2536
2537 pie
2538 Driver RejectNegative Negative(shared)
2539 Create a position independent executable
2540
2541 z
2542 Driver Joined Separate
2543
2544 ; This comment is to ensure we retain the blank line above.