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