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