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) Warning
 613 Warn about code which might break strict aliasing rules
 614
 615 Wstrict-overflow
 616 Common Warning
 617 Warn about optimizations that assume that signed overflow is undefined
 618
 619 Wstrict-overflow=
 620 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
 621 Warn about optimizations that assume that signed overflow is undefined
 622
 623 Wsuggest-attribute=const
 624 Common Var(warn_suggest_attribute_const) Warning
 625 Warn about functions which might be candidates for __attribute__((const))
 626
 627 Wsuggest-attribute=pure
 628 Common Var(warn_suggest_attribute_pure) Warning
 629 Warn about functions which might be candidates for __attribute__((pure))
 630
 631 Wsuggest-attribute=noreturn
 632 Common Var(warn_suggest_attribute_noreturn) Warning
 633 Warn about functions which might be candidates for __attribute__((noreturn))
 634
 635 Wsystem-headers
 636 Common Var(warn_system_headers) Warning
 637 Do not suppress warnings from system headers
 638
 639 Wtrampolines
 640 Common Var(warn_trampolines) Warning
 641 Warn whenever a trampoline is generated
 642
 643 Wtype-limits
 644 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
 645 Warn if a comparison is always true or always false due to the limited range of the data type
 646
 647 Wuninitialized
 648 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
 649 Warn about uninitialized automatic variables
 650
 651 Wmaybe-uninitialized
 652 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
 653 Warn about maybe uninitialized automatic variables
 654
 655 Wunreachable-code
 656 Common Ignore
 657 Does nothing. Preserved for backward compatibility.
 658
 659 Wunused
 660 Common Var(warn_unused) Init(0) Warning
 661 Enable all -Wunused- warnings
 662
 663 Wunused-but-set-parameter
 664 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
 665 Warn when a function parameter is only set, otherwise unused
 666
 667 Wunused-but-set-variable
 668 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
 669 Warn when a variable is only set, otherwise unused
 670
 671 Wunused-function
 672 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
 673 Warn when a function is unused
 674
 675 Wunused-label
 676 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
 677 Warn when a label is unused
 678
 679 Wunused-parameter
 680 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
 681 Warn when a function parameter is unused
 682
 683 Wunused-value
 684 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
 685 Warn when an expression value is unused
 686
 687 Wunused-variable
 688 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
 689 Warn when a variable is unused
 690
 691 Wcoverage-mismatch
 692 Common Var(warn_coverage_mismatch) Init(1) Warning
 693 Warn in case profiles in -fprofile-use do not match
 694
 695 Wvector-operation-performance
 696 Common Var(warn_vector_operation_performance) Warning
 697 Warn when a vector operation is compiled outside the SIMD
 698
 699 Xassembler
 700 Driver Separate
 701
 702 Xlinker
 703 Driver Separate
 704
 705 Xpreprocessor
 706 Driver Separate
 707
 708 Z
 709 Driver
 710
 711 aux-info
 712 Common Separate Var(aux_info_file_name)
 713 -aux-info <file>        Emit declaration information into <file>
 714
 715 aux-info=
 716 Common Joined Alias(aux-info)
 717
 718 auxbase
 719 Common Separate RejectDriver Var(aux_base_name)
 720
 721 auxbase-strip
 722 Common Separate RejectDriver
 723
 724 coverage
 725 Driver
 726
 727 c
 728 Driver
 729
 730 d
 731 Common Joined
 732 -d<letters>     Enable dumps from specific passes of the compiler
 733
 734 dumpbase
 735 Common Separate Var(dump_base_name)
 736 -dumpbase <file>        Set the file basename to be used for dumps
 737
 738 dumpdir
 739 Common Separate Var(dump_dir_name)
 740 -dumpdir <dir>  Set the directory name to be used for dumps
 741
 742 dumpmachine
 743 Driver
 744
 745 dumpspecs
 746 Driver
 747
 748 dumpversion
 749 Driver
 750
 751 e
 752 Driver Joined Separate
 753
 754 ; This option has historically been passed down to the linker by an
 755 ; accident of a %{e*} spec, so ensure it continues to be passed down
 756 ; as a single option.  The supported option for this purpose is
 757 ; -rdynamic.  See PR 47390.
 758 export-dynamic
 759 Driver Undocumented
 760
 761 ; The version of the C++ ABI in use.  The following values are allowed:
 762 ;
 763 ; 0: The version of the ABI believed most conformant with the C++ ABI
 764 ;    specification.  This ABI may change as bugs are discovered and fixed.
 765 ;    Therefore, 0 will not necessarily indicate the same ABI in different
 766 ;    versions of G++.
 767 ;
 768 ; 1: The version of the ABI first used in G++ 3.2.
 769 ;
 770 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
 771 ;
 772 ; 3: The version of the ABI that fixes the missing underscore
 773 ;    in template non-type arguments of pointer type.
 774 ;
 775 ; 4: The version of the ABI that introduces unambiguous mangling of
 776 ;    vector types.  First selectable in G++ 4.5.
 777 ;
 778 ; 5: The version of the ABI that ignores attribute const/noreturn
 779 ;    in function pointer mangling, and corrects mangling of decltype and
 780 ;    function parameters used in other parameters and the return type.
 781 ;    First selectable in G++ 4.6.
 782 ;
 783 ; 6: The version of the ABI that doesn't promote scoped enums to int and
 784 ;    changes the mangling of template argument packs, const/static_cast,
 785 ;    prefix ++ and --, and a class scope function used as a template
 786 ;    argument.
 787 ;    First selectable in G++ 4.7.
 788 ;
 789 ; 7: The version of the ABI that treats nullptr_t as a builtin type.
 790 ;    First selectable in G++ 4.8.
 791 ; Additional positive integers will be assigned as new versions of
 792 ; the ABI become the default version of the ABI.
 793 fabi-version=
 794 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(2)
 795
 796 falign-functions
 797 Common Report Var(align_functions,0) Optimization UInteger
 798 Align the start of functions
 799
 800 falign-functions=
 801 Common RejectNegative Joined UInteger Var(align_functions)
 802
 803 falign-jumps
 804 Common Report Var(align_jumps,0) Optimization UInteger
 805 Align labels which are only reached by jumping
 806
 807 falign-jumps=
 808 Common RejectNegative Joined UInteger Var(align_jumps)
 809
 810 falign-labels
 811 Common Report Var(align_labels,0) Optimization UInteger
 812 Align all labels
 813
 814 falign-labels=
 815 Common RejectNegative Joined UInteger Var(align_labels)
 816
 817 falign-loops
 818 Common Report Var(align_loops,0) Optimization UInteger
 819 Align the start of loops
 820
 821 falign-loops=
 822 Common RejectNegative Joined UInteger Var(align_loops)
 823
 824 fargument-alias
 825 Common Ignore
 826 Does nothing. Preserved for backward compatibility.
 827
 828 fargument-noalias
 829 Common Ignore
 830 Does nothing. Preserved for backward compatibility.
 831
 832 fargument-noalias-global
 833 Common Ignore
 834 Does nothing. Preserved for backward compatibility.
 835
 836 fargument-noalias-anything
 837 Common Ignore
 838 Does nothing. Preserved for backward compatibility.
 839
 840 faddress-sanitizer
 841 Common Report Var(flag_asan)
 842 Enable AddressSanitizer, a memory error detector
 843
 844 fasynchronous-unwind-tables
 845 Common Report Var(flag_asynchronous_unwind_tables) Optimization
 846 Generate unwind tables that are exact at each instruction boundary
 847
 848 fauto-inc-dec
 849 Common Report Var(flag_auto_inc_dec) Init(1)
 850 Generate auto-inc/dec instructions
 851
 852 ; -fcheck-bounds causes gcc to generate array bounds checks.
 853 ; For C, C++ and ObjC: defaults off.
 854 ; For Java: defaults to on.
 855 ; For Fortran: defaults to off.
 856 fbounds-check
 857 Common Report Var(flag_bounds_check)
 858 Generate code to check bounds before indexing arrays
 859
 860 fbranch-count-reg
 861 Common Report Var(flag_branch_on_count_reg) Init(1) Optimization
 862 Replace add, compare, branch with branch on count register
 863
 864 fbranch-probabilities
 865 Common Report Var(flag_branch_probabilities) Optimization
 866 Use profiling information for branch probabilities
 867
 868 fbranch-target-load-optimize
 869 Common Report Var(flag_branch_target_load_optimize) Optimization
 870 Perform branch target load optimization before prologue / epilogue threading
 871
 872 fbranch-target-load-optimize2
 873 Common Report Var(flag_branch_target_load_optimize2) Optimization
 874 Perform branch target load optimization after prologue / epilogue threading
 875
 876 fbtr-bb-exclusive
 877 Common Report Var(flag_btr_bb_exclusive) Optimization
 878 Restrict target load migration not to re-use registers in any basic block
 879
 880 fcall-saved-
 881 Common Joined RejectNegative Var(common_deferred_options) Defer
 882 -fcall-saved-<register> Mark <register> as being preserved across functions
 883
 884 fcall-used-
 885 Common Joined RejectNegative Var(common_deferred_options) Defer
 886 -fcall-used-<register>  Mark <register> as being corrupted by function calls
 887
 888 ; Nonzero for -fcaller-saves: allocate values in regs that need to
 889 ; be saved across function calls, if that produces overall better code.
 890 ; Optional now, so people can test it.
 891 fcaller-saves
 892 Common Report Var(flag_caller_saves) Optimization
 893 Save registers around function calls
 894
 895 fcheck-data-deps
 896 Common Report Var(flag_check_data_deps)
 897 Compare the results of several data dependence analyzers.
 898
 899 fcombine-stack-adjustments
 900 Common Report Var(flag_combine_stack_adjustments) Optimization
 901 Looks for opportunities to reduce stack adjustments and stack references.
 902
 903 fcommon
 904 Common Report Var(flag_no_common,0) Optimization
 905 Do not put uninitialized globals in the common section
 906
 907 fcompare-debug
 908 Driver
 909 ; Converted by the driver to -fcompare-debug= options.
 910
 911 fcompare-debug=
 912 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
 913 -fcompare-debug[=<opts>]        Compile with and without e.g. -gtoggle, and compare the final-insns dump
 914
 915 fcompare-debug-second
 916 Common Driver RejectNegative Var(flag_compare_debug)
 917 Run only the second compilation of -fcompare-debug
 918
 919 fcompare-elim
 920 Common Report Var(flag_compare_elim_after_reload) Optimization
 921 Perform comparison elimination after register allocation has finished
 922
 923 fconserve-stack
 924 Common Var(flag_conserve_stack) Optimization
 925 Do not perform optimizations increasing noticeably stack usage
 926
 927 fcprop-registers
 928 Common Report Var(flag_cprop_registers) Optimization
 929 Perform a register copy-propagation optimization pass
 930
 931 fcrossjumping
 932 Common Report Var(flag_crossjumping) Optimization
 933 Perform cross-jumping optimization
 934
 935 fcse-follow-jumps
 936 Common Report Var(flag_cse_follow_jumps) Optimization
 937 When running CSE, follow jumps to their targets
 938
 939 fcse-skip-blocks
 940 Common Ignore
 941 Does nothing.  Preserved for backward compatibility.
 942
 943 fcx-limited-range
 944 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
 945 Omit range reduction step when performing complex division
 946
 947 fcx-fortran-rules
 948 Common Report Var(flag_cx_fortran_rules) Optimization
 949 Complex multiplication and division follow Fortran rules
 950
 951 fdata-sections
 952 Common Report Var(flag_data_sections) Optimization
 953 Place data items into their own section
 954
 955 fdbg-cnt-list
 956 Common Report Var(common_deferred_options) Defer
 957 List all available debugging counters with their limits and counts.
 958
 959 fdbg-cnt=
 960 Common RejectNegative Joined Var(common_deferred_options) Defer
 961 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...]     Set the debug counter limit.
 962
 963 fdebug-prefix-map=
 964 Common Joined RejectNegative Var(common_deferred_options) Defer
 965 Map one directory name to another in debug information
 966
 967 fdebug-types-section
 968 Common Report Var(flag_debug_types_section) Init(0)
 969 Output .debug_types section when using DWARF v4 debuginfo.
 970
 971 ; Nonzero for -fdefer-pop: don't pop args after each function call
 972 ; instead save them up to pop many calls' args with one insns.
 973 fdefer-pop
 974 Common Report Var(flag_defer_pop) Optimization
 975 Defer popping functions args from stack until later
 976
 977 fdelayed-branch
 978 Common Report Var(flag_delayed_branch) Optimization
 979 Attempt to fill delay slots of branch instructions
 980
 981 fdelete-dead-exceptions
 982 Common Report Var(flag_delete_dead_exceptions) Init(0)
 983 Delete dead instructions that may throw exceptions
 984
 985 fdelete-null-pointer-checks
 986 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
 987 Delete useless null pointer checks
 988
 989 fdevirtualize
 990 Common Report Var(flag_devirtualize) Optimization
 991 Try to convert virtual calls to direct ones.
 992
 993 fdiagnostics-show-location=
 994 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
 995 -fdiagnostics-show-location=[once|every-line]   How often to emit source location at the beginning of line-wrapped diagnostics
 996
 997 ; Required for these enum values.
 998 SourceInclude
 999 pretty-print.h
1000
1001 Enum
1002 Name(diagnostic_prefixing_rule) Type(int)
1003
1004 EnumValue
1005 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1006
1007 EnumValue
1008 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1009
1010 fdiagnostics-show-caret
1011 Common Var(flag_diagnostics_show_caret) Init(1)
1012 Show the source line with a caret indicating the column
1013
1014 fdiagnostics-show-option
1015 Common Var(flag_diagnostics_show_option) Init(1)
1016 Amend appropriate diagnostic messages with the command line option that controls them
1017
1018 fdisable-
1019 Common Joined RejectNegative Var(common_deferred_options) Defer
1020 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1021
1022 fenable-
1023 Common Joined RejectNegative Var(common_deferred_options) Defer
1024 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1025
1026 fdump-
1027 Common Joined RejectNegative Var(common_deferred_options) Defer
1028 -fdump-<type>   Dump various compiler internals to a file
1029
1030 fdump-final-insns
1031 Driver RejectNegative
1032
1033 fdump-final-insns=
1034 Common RejectNegative Joined Var(flag_dump_final_insns)
1035 -fdump-final-insns=filename     Dump to filename the insns at the end of translation
1036
1037 fdump-go-spec=
1038 Common RejectNegative Joined Var(flag_dump_go_spec)
1039 -fdump-go-spec=filename Write all declarations to file as Go code
1040
1041 fdump-noaddr
1042 Common Report Var(flag_dump_noaddr)
1043 Suppress output of addresses in debugging dumps
1044
1045 fdump-passes
1046 Common Var(flag_dump_passes) Init(0)
1047 Dump optimization passes
1048
1049 fdump-unnumbered
1050 Common Report Var(flag_dump_unnumbered)
1051 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1052
1053 fdump-unnumbered-links
1054 Common Report Var(flag_dump_unnumbered_links)
1055 Suppress output of previous and next insn numbers in debugging dumps
1056
1057 fdwarf2-cfi-asm
1058 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1059 Enable CFI tables via GAS assembler directives.
1060
1061 fearly-inlining
1062 Common Report Var(flag_early_inlining) Init(1) Optimization
1063 Perform early inlining
1064
1065 feliminate-dwarf2-dups
1066 Common Report Var(flag_eliminate_dwarf2_dups)
1067 Perform DWARF2 duplicate elimination
1068
1069 fipa-sra
1070 Common Report Var(flag_ipa_sra) Init(0) Optimization
1071 Perform interprocedural reduction of aggregates
1072
1073 feliminate-unused-debug-symbols
1074 Common Report Var(flag_debug_only_used_symbols)
1075 Perform unused type elimination in debug info
1076
1077 feliminate-unused-debug-types
1078 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1079 Perform unused type elimination in debug info
1080
1081 femit-class-debug-always
1082 Common Report Var(flag_emit_class_debug_always) Init(0)
1083 Do not suppress C++ class debug information.
1084
1085 fexceptions
1086 Common Report Var(flag_exceptions) Optimization
1087 Enable exception handling
1088
1089 fexpensive-optimizations
1090 Common Report Var(flag_expensive_optimizations) Optimization
1091 Perform a number of minor, expensive optimizations
1092
1093 fexcess-precision=
1094 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1095 -fexcess-precision=[fast|standard]      Specify handling of excess floating-point precision
1096
1097 Enum
1098 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1099
1100 EnumValue
1101 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1102
1103 EnumValue
1104 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1105
1106 ffast-math
1107 Common
1108
1109 ffat-lto-objects
1110 Common Var(flag_fat_lto_objects) Init(1)
1111 Output lto objects containing both the intermediate language and binary output.
1112
1113 ffinite-math-only
1114 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1115 Assume no NaNs or infinities are generated
1116
1117 ffixed-
1118 Common Joined RejectNegative Var(common_deferred_options) Defer
1119 -ffixed-<register>      Mark <register> as being unavailable to the compiler
1120
1121 ffloat-store
1122 Common Report Var(flag_float_store) Optimization
1123 Don't allocate floats and doubles in extended-precision registers
1124
1125 fforce-addr
1126 Common Ignore
1127 Does nothing.  Preserved for backward compatibility.
1128
1129 fforward-propagate
1130 Common Report Var(flag_forward_propagate) Optimization
1131 Perform a forward propagation pass on RTL
1132
1133 ffp-contract=
1134 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1135 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1136
1137 Enum
1138 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1139
1140 EnumValue
1141 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1142
1143 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1144 EnumValue
1145 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1146
1147 EnumValue
1148 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1149
1150 ; Nonzero means don't put addresses of constant functions in registers.
1151 ; Used for compiling the Unix kernel, where strange substitutions are
1152 ; done on the assembly output.
1153 ffunction-cse
1154 Common Report Var(flag_no_function_cse,0)
1155 Allow function addresses to be held in registers
1156
1157 ffunction-sections
1158 Common Report Var(flag_function_sections)
1159 Place each function into its own section
1160
1161 fgcse
1162 Common Report Var(flag_gcse) Optimization
1163 Perform global common subexpression elimination
1164
1165 fgcse-lm
1166 Common Report Var(flag_gcse_lm) Init(1) Optimization
1167 Perform enhanced load motion during global common subexpression elimination
1168
1169 fgcse-sm
1170 Common Report Var(flag_gcse_sm) Init(0) Optimization
1171 Perform store motion after global common subexpression elimination
1172
1173 fgcse-las
1174 Common Report Var(flag_gcse_las) Init(0) Optimization
1175 Perform redundant load after store elimination in global common subexpression
1176 elimination
1177
1178 fgcse-after-reload
1179 Common Report Var(flag_gcse_after_reload) Optimization
1180 Perform global common subexpression elimination after register allocation
1181 has finished
1182
1183 ; This option is not documented yet as its semantics will change.
1184 fgraphite
1185 Common Report Var(flag_graphite)
1186 Enable in and out of Graphite representation
1187
1188 fgraphite-identity
1189 Common Report Var(flag_graphite_identity) Optimization
1190 Enable Graphite Identity transformation
1191
1192 fhoist-adjacent-loads
1193 Common Report Var(flag_hoist_adjacent_loads) Optimization
1194 Enable hoisting adjacent loads to encourage generating conditional move
1195 instructions
1196
1197 floop-parallelize-all
1198 Common Report Var(flag_loop_parallelize_all) Optimization
1199 Mark all loops as parallel
1200
1201 floop-strip-mine
1202 Common Report Var(flag_loop_strip_mine) Optimization
1203 Enable Loop Strip Mining transformation
1204
1205 floop-interchange
1206 Common Report Var(flag_loop_interchange) Optimization
1207 Enable Loop Interchange transformation
1208
1209 floop-block
1210 Common Report Var(flag_loop_block) Optimization
1211 Enable Loop Blocking transformation
1212
1213 fgnu-tm
1214 Common Report Var(flag_tm)
1215 Enable support for GNU transactional memory
1216
1217 floop-flatten
1218 Common Ignore
1219 Does nothing. Preserved for backward compatibility.
1220
1221 floop-nest-optimize
1222 Common Report Var(flag_loop_optimize_isl) Optimization
1223 Enable the ISL based loop nest optimizer
1224
1225 fstrict-volatile-bitfields
1226 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1227 Force bitfield accesses to match their type width
1228
1229 fguess-branch-probability
1230 Common Report Var(flag_guess_branch_prob) Optimization
1231 Enable guessing of branch probabilities
1232
1233 ; Nonzero means ignore `#ident' directives.  0 means handle them.
1234 ; Generate position-independent code for executables if possible
1235 ; On SVR4 targets, it also controls whether or not to emit a
1236 ; string identifying the compiler.
1237 fident
1238 Common Report Var(flag_no_ident,0)
1239 Process #ident directives
1240
1241 fif-conversion
1242 Common Report Var(flag_if_conversion) Optimization
1243 Perform conversion of conditional jumps to branchless equivalents
1244
1245 fif-conversion2
1246 Common Report Var(flag_if_conversion2) Optimization
1247 Perform conversion of conditional jumps to conditional execution
1248
1249 fstack-reuse=
1250 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1251 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1252
1253 Enum
1254 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1255
1256 EnumValue
1257 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1258
1259 EnumValue
1260 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1261
1262 EnumValue
1263 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1264
1265 ftree-loop-if-convert
1266 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1267 Convert conditional jumps in innermost loops to branchless equivalents
1268
1269 ftree-loop-if-convert-stores
1270 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1271 Also if-convert conditional jumps containing memory writes
1272
1273 ; -finhibit-size-directive inhibits output of .size for ELF.
1274 ; This is used only for compiling crtstuff.c,
1275 ; and it may be extended to other effects
1276 ; needed for crtstuff.c on other systems.
1277 finhibit-size-directive
1278 Common Report Var(flag_inhibit_size_directive)
1279 Do not generate .size directives
1280
1281 findirect-inlining
1282 Common Report Var(flag_indirect_inlining)
1283 Perform indirect inlining
1284
1285 ; General flag to enable inlining.  Specifying -fno-inline will disable
1286 ; all inlining apart from always-inline functions.
1287 finline
1288 Common Report Var(flag_no_inline,0) Init(0) Optimization
1289 Enable inlining of function declared \"inline\", disabling disables all inlining
1290
1291 finline-small-functions
1292 Common Report Var(flag_inline_small_functions) Optimization
1293 Integrate functions into their callers when code size is known not to grow
1294
1295 finline-functions
1296 Common Report Var(flag_inline_functions) Optimization
1297 Integrate functions not declared \"inline\" into their callers when profitable
1298
1299 finline-functions-called-once
1300 Common Report Var(flag_inline_functions_called_once) Optimization
1301 Integrate functions only required by their single caller
1302
1303 finline-limit-
1304 Common RejectNegative Joined Alias(finline-limit=)
1305
1306 finline-limit=
1307 Common RejectNegative Joined UInteger
1308 -finline-limit=<number> Limit the size of inlined functions to <number>
1309
1310 finline-atomics
1311 Common Report Var(flag_inline_atomics) Init(1) Optimization
1312 Inline __atomic operations when a lock free instruction sequence is available.
1313
1314 finstrument-functions
1315 Common Report Var(flag_instrument_function_entry_exit)
1316 Instrument function entry and exit with profiling calls
1317
1318 finstrument-functions-exclude-function-list=
1319 Common RejectNegative Joined
1320 -finstrument-functions-exclude-function-list=name,...  Do not instrument listed functions
1321
1322 finstrument-functions-exclude-file-list=
1323 Common RejectNegative Joined
1324 -finstrument-functions-exclude-file-list=filename,...  Do not instrument functions listed in files
1325
1326 fipa-cp
1327 Common Report Var(flag_ipa_cp) Optimization
1328 Perform Interprocedural constant propagation
1329
1330 fipa-cp-clone
1331 Common Report Var(flag_ipa_cp_clone) Optimization
1332 Perform cloning to make Interprocedural constant propagation stronger
1333
1334 fipa-profile
1335 Common Report Var(flag_ipa_profile) Init(0) Optimization
1336 Perform interprocedural profile propagation
1337
1338 fipa-pta
1339 Common Report Var(flag_ipa_pta) Init(0) Optimization
1340 Perform interprocedural points-to analysis
1341
1342 fipa-pure-const
1343 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1344 Discover pure and const functions
1345
1346 fipa-reference
1347 Common Report Var(flag_ipa_reference) Init(0) Optimization
1348 Discover readonly and non addressable static variables
1349
1350 fipa-matrix-reorg
1351 Common Ignore
1352 Does nothing. Preserved for backward compatibility.
1353
1354 fipa-struct-reorg
1355 Common Ignore
1356 Does nothing. Preserved for backward compatibility.
1357
1358 fira-algorithm=
1359 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1360 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1361
1362 Enum
1363 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1364
1365 EnumValue
1366 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1367
1368 EnumValue
1369 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1370
1371 fira-region=
1372 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1373 -fira-region=[one|all|mixed] Set regions for IRA
1374
1375 Enum
1376 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1377
1378 EnumValue
1379 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1380
1381 EnumValue
1382 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1383
1384 EnumValue
1385 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1386
1387 fira-hoist-pressure
1388 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1389 Use IRA based register pressure calculation
1390 in RTL hoist optimizations.
1391
1392 fira-loop-pressure
1393 Common Report Var(flag_ira_loop_pressure)
1394 Use IRA based register pressure calculation
1395 in RTL loop optimizations.
1396
1397 fira-share-save-slots
1398 Common Report Var(flag_ira_share_save_slots) Init(1)
1399 Share slots for saving different hard registers.
1400
1401 fira-share-spill-slots
1402 Common Report Var(flag_ira_share_spill_slots) Init(1)
1403 Share stack slots for spilled pseudo-registers.
1404
1405 fira-verbose=
1406 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1407 -fira-verbose=<number>  Control IRA's level of diagnostic messages.
1408
1409 fivopts
1410 Common Report Var(flag_ivopts) Init(1) Optimization
1411 Optimize induction variables on trees
1412
1413 fjump-tables
1414 Common Var(flag_jump_tables) Init(1) Optimization
1415 Use jump tables for sufficiently large switch statements
1416
1417 fkeep-inline-functions
1418 Common Report Var(flag_keep_inline_functions)
1419 Generate code for functions even if they are fully inlined
1420
1421 fkeep-static-consts
1422 Common Report Var(flag_keep_static_consts) Init(1)
1423 Emit static const variables even if they are not used
1424
1425 fleading-underscore
1426 Common Report Var(flag_leading_underscore) Init(-1)
1427 Give external symbols a leading underscore
1428
1429 floop-optimize
1430 Common Ignore
1431 Does nothing.  Preserved for backward compatibility.
1432
1433 flto
1434 Common
1435 Enable link-time optimization.
1436
1437 flto=
1438 Common RejectNegative Joined Var(flag_lto)
1439 Link-time optimization with number of parallel jobs or jobserver.
1440
1441 flto-partition=1to1
1442 Common Var(flag_lto_partition_1to1)
1443 Partition symbols and vars at linktime based on object files they originate from
1444
1445 flto-partition=balanced
1446 Common Var(flag_lto_partition_balanced)
1447 Partition functions and vars at linktime into approximately same sized buckets
1448
1449 flto-partition=max
1450 Common Var(flag_lto_partition_max)
1451 Put every symbol into separate partition
1452
1453 flto-partition=none
1454 Common Var(flag_lto_partition_none)
1455 Disable partioning and streaming
1456
1457 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1458 flto-compression-level=
1459 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1460 -flto-compression-level=<number>        Use zlib compression level <number> for IL
1461
1462 flto-report
1463 Common Report Var(flag_lto_report) Init(0)
1464 Report various link-time optimization statistics
1465
1466 fmath-errno
1467 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1468 Set errno after built-in math functions
1469
1470 fmax-errors=
1471 Common Joined RejectNegative UInteger Var(flag_max_errors)
1472 -fmax-errors=<number>   Maximum number of errors to report
1473
1474 fmem-report
1475 Common Report Var(mem_report)
1476 Report on permanent memory allocation
1477
1478 fmem-report-wpa
1479 Common Report Var(mem_report_wpa)
1480 Report on permanent memory allocation in WPA only
1481
1482 ; This will attempt to merge constant section constants, if 1 only
1483 ; string constants and constants from constant pool, if 2 also constant
1484 ; variables.
1485 fmerge-all-constants
1486 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1487 Attempt to merge identical constants and constant variables
1488
1489 fmerge-constants
1490 Common Report Var(flag_merge_constants,1) Optimization
1491 Attempt to merge identical constants across compilation units
1492
1493 fmerge-debug-strings
1494 Common Report Var(flag_merge_debug_strings) Init(1)
1495 Attempt to merge identical debug strings across compilation units
1496
1497 fmessage-length=
1498 Common RejectNegative Joined UInteger
1499 -fmessage-length=<number>       Limit diagnostics to <number> characters per line.  0 suppresses line-wrapping
1500
1501 fmodulo-sched
1502 Common Report Var(flag_modulo_sched) Optimization
1503 Perform SMS based modulo scheduling before the first scheduling pass
1504
1505 fmodulo-sched-allow-regmoves
1506 Common Report Var(flag_modulo_sched_allow_regmoves)
1507 Perform SMS based modulo scheduling with register moves allowed
1508
1509 fmove-loop-invariants
1510 Common Report Var(flag_move_loop_invariants) Init(1) Optimization
1511 Move loop invariant computations out of loops
1512
1513 fdce
1514 Common Var(flag_dce) Init(1) Optimization
1515 Use the RTL dead code elimination pass
1516
1517 fdse
1518 Common Var(flag_dse) Init(1) Optimization
1519 Use the RTL dead store elimination pass
1520
1521 freschedule-modulo-scheduled-loops
1522 Common Report Var(flag_resched_modulo_sched) Optimization
1523 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1524
1525 fnon-call-exceptions
1526 Common Report Var(flag_non_call_exceptions) Optimization
1527 Support synchronous non-call exceptions
1528
1529 fomit-frame-pointer
1530 Common Report Var(flag_omit_frame_pointer) Optimization
1531 When possible do not generate stack frames
1532
1533 fopt-info
1534 Common Report Var(flag_opt_info) Optimization
1535 Enable all optimization info dumps on stderr
1536
1537 fopt-info-
1538 Common Joined RejectNegative Var(common_deferred_options) Defer
1539 -fopt-info[-<type>=filename]    Dump compiler optimization details
1540
1541 foptimize-register-move
1542 Common Report Var(flag_regmove) Optimization
1543 Do the full register move optimization pass
1544
1545 foptimize-sibling-calls
1546 Common Report Var(flag_optimize_sibling_calls) Optimization
1547 Optimize sibling and tail recursive calls
1548
1549 fpartial-inlining
1550 Common Report Var(flag_partial_inlining)
1551 Perform partial inlining
1552
1553 fpre-ipa-mem-report
1554 Common Report Var(pre_ipa_mem_report)
1555 Report on memory allocation before interprocedural optimization
1556
1557 fpost-ipa-mem-report
1558 Common Report Var(post_ipa_mem_report)
1559 Report on memory allocation before interprocedural optimization
1560
1561 fpack-struct
1562 Common Report Var(flag_pack_struct) Optimization
1563 Pack structure members together without holes
1564
1565 fpack-struct=
1566 Common RejectNegative Joined UInteger Optimization
1567 -fpack-struct=<number>  Set initial maximum structure member alignment
1568
1569 fpcc-struct-return
1570 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1571 Return small aggregates in memory, not registers
1572
1573 fpeel-loops
1574 Common Report Var(flag_peel_loops) Optimization
1575 Perform loop peeling
1576
1577 fpeephole
1578 Common Report Var(flag_no_peephole,0) Optimization
1579 Enable machine specific peephole optimizations
1580
1581 fpeephole2
1582 Common Report Var(flag_peephole2) Optimization
1583 Enable an RTL peephole pass before sched2
1584
1585 fPIC
1586 Common Report Var(flag_pic,2)
1587 Generate position-independent code if possible (large mode)
1588
1589 fPIE
1590 Common Report Var(flag_pie,2)
1591 Generate position-independent code for executables if possible (large mode)
1592
1593 fpic
1594 Common Report Var(flag_pic,1)
1595 Generate position-independent code if possible (small mode)
1596
1597 fpie
1598 Common Report Var(flag_pie,1)
1599 Generate position-independent code for executables if possible (small mode)
1600
1601 fplugin=
1602 Common Joined RejectNegative Var(common_deferred_options) Defer
1603 Specify a plugin to load
1604
1605 fplugin-arg-
1606 Common Joined RejectNegative Var(common_deferred_options) Defer
1607 -fplugin-arg-<name>-<key>[=<value>]     Specify argument <key>=<value> for plugin <name>
1608
1609 fpredictive-commoning
1610 Common Report Var(flag_predictive_commoning) Optimization
1611 Run predictive commoning optimization.
1612
1613 fprefetch-loop-arrays
1614 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1615 Generate prefetch instructions, if available, for arrays in loops
1616
1617 fprofile
1618 Common Report Var(profile_flag)
1619 Enable basic program profiling code
1620
1621 fprofile-arcs
1622 Common Report Var(profile_arc_flag)
1623 Insert arc-based program profiling code
1624
1625 fprofile-dir=
1626 Common Joined RejectNegative Var(profile_data_prefix)
1627 Set the top-level directory for storing the profile data.
1628 The default is 'pwd'.
1629
1630 fprofile-correction
1631 Common Report Var(flag_profile_correction)
1632 Enable correction of flow inconsistent profile data input
1633
1634 fprofile-generate
1635 Common
1636 Enable common options for generating profile info for profile feedback directed optimizations
1637
1638 fprofile-generate=
1639 Common Joined RejectNegative
1640 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1641
1642 fprofile-use
1643 Common Var(flag_profile_use)
1644 Enable common options for performing profile feedback directed optimizations
1645
1646 fprofile-use=
1647 Common Joined RejectNegative
1648 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1649
1650 fprofile-values
1651 Common Report Var(flag_profile_values)
1652 Insert code to profile values of expressions
1653
1654 fprofile-report
1655 Common Report Var(profile_report)
1656 Report on consistency of profile
1657
1658 frandom-seed
1659 Common Var(common_deferred_options) Defer
1660
1661 frandom-seed=
1662 Common Joined RejectNegative Var(common_deferred_options) Defer
1663 -frandom-seed=<string>  Make compile reproducible using <string>
1664
1665 ; This switch causes the command line that was used to create an
1666 ; object file to be recorded into the object file.  The exact format
1667 ; of this recording is target and binary file format dependent.
1668 ; It is related to the -fverbose-asm switch, but that switch only
1669 ; records information in the assembler output file as comments, so
1670 ; they never reach the object file.
1671 frecord-gcc-switches
1672 Common Report Var(flag_record_gcc_switches)
1673 Record gcc command line switches in the object file.
1674
1675 freg-struct-return
1676 Common Report Var(flag_pcc_struct_return,0) Optimization
1677 Return small aggregates in registers
1678
1679 fregmove
1680 Common Report Var(flag_regmove) Optimization
1681 Enables a register move optimization
1682
1683 frename-registers
1684 Common Report Var(flag_rename_registers) Init(2) Optimization
1685 Perform a register renaming optimization pass
1686
1687 freorder-blocks
1688 Common Report Var(flag_reorder_blocks) Optimization
1689 Reorder basic blocks to improve code placement
1690
1691 freorder-blocks-and-partition
1692 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1693 Reorder basic blocks and partition into hot and cold sections
1694
1695 freorder-functions
1696 Common Report Var(flag_reorder_functions) Optimization
1697 Reorder functions to improve code placement
1698
1699 frerun-cse-after-loop
1700 Common Report Var(flag_rerun_cse_after_loop) Optimization
1701 Add a common subexpression elimination pass after loop optimizations
1702
1703 frerun-loop-opt
1704 Common Ignore
1705 Does nothing.  Preserved for backward compatibility.
1706
1707 frounding-math
1708 Common Report Var(flag_rounding_math) Optimization SetByCombined
1709 Disable optimizations that assume default FP rounding behavior
1710
1711 fsched-interblock
1712 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1713 Enable scheduling across basic blocks
1714
1715 fsched-pressure
1716 Common Report Var(flag_sched_pressure) Init(0) Optimization
1717 Enable register pressure sensitive insn scheduling
1718
1719 fsched-spec
1720 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1721 Allow speculative motion of non-loads
1722
1723 fsched-spec-load
1724 Common Report Var(flag_schedule_speculative_load) Optimization
1725 Allow speculative motion of some loads
1726
1727 fsched-spec-load-dangerous
1728 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1729 Allow speculative motion of more loads
1730
1731 fsched-verbose=
1732 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1733 -fsched-verbose=<number>        Set the verbosity level of the scheduler
1734
1735 fsched2-use-superblocks
1736 Common Report Var(flag_sched2_use_superblocks) Optimization
1737 If scheduling post reload, do superblock scheduling
1738
1739 fsched2-use-traces
1740 Common Ignore
1741 Does nothing.  Preserved for backward compatibility.
1742
1743 fschedule-insns
1744 Common Report Var(flag_schedule_insns) Optimization
1745 Reschedule instructions before register allocation
1746
1747 fschedule-insns2
1748 Common Report Var(flag_schedule_insns_after_reload) Optimization
1749 Reschedule instructions after register allocation
1750
1751 ; This flag should be on when a target implements non-trivial
1752 ; scheduling hooks, maybe saving some information for its own sake.
1753 ; On IA64, for example, this is used for correct bundling.
1754 fselective-scheduling
1755 Common Report Var(flag_selective_scheduling) Optimization
1756 Schedule instructions using selective scheduling algorithm
1757
1758 fselective-scheduling2
1759 Common Report Var(flag_selective_scheduling2) Optimization
1760 Run selective scheduling after reload
1761
1762 fsel-sched-pipelining
1763 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1764 Perform software pipelining of inner loops during selective scheduling
1765
1766 fsel-sched-pipelining-outer-loops
1767 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1768 Perform software pipelining of outer loops during selective scheduling
1769
1770 fsel-sched-reschedule-pipelined
1771 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1772 Reschedule pipelined regions without pipelining
1773
1774 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1775 ; of stalled insns into the ready list.
1776 fsched-stalled-insns
1777 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1778 Allow premature scheduling of queued insns
1779
1780 fsched-stalled-insns=
1781 Common RejectNegative Joined UInteger
1782 -fsched-stalled-insns=<number>  Set number of queued insns that can be prematurely scheduled
1783
1784 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1785 ; be examined for a dependency on a stalled insn that is candidate for
1786 ; premature removal from the queue of stalled insns into the ready list (has
1787 ; an effect only if the flag 'sched_stalled_insns' is set).
1788 fsched-stalled-insns-dep
1789 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1790 Set dependence distance checking in premature scheduling of queued insns
1791
1792 fsched-stalled-insns-dep=
1793 Common RejectNegative Joined UInteger
1794 -fsched-stalled-insns-dep=<number>      Set dependence distance checking in premature scheduling of queued insns
1795
1796 fsched-group-heuristic
1797 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1798 Enable the group heuristic in the scheduler
1799
1800 fsched-critical-path-heuristic
1801 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1802 Enable the critical path heuristic in the scheduler
1803
1804 fsched-spec-insn-heuristic
1805 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1806 Enable the speculative instruction heuristic in the scheduler
1807
1808 fsched-rank-heuristic
1809 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1810 Enable the rank heuristic in the scheduler
1811
1812 fsched-last-insn-heuristic
1813 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1814 Enable the last instruction heuristic in the scheduler
1815
1816 fsched-dep-count-heuristic
1817 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1818 Enable the dependent count heuristic in the scheduler
1819
1820 fsection-anchors
1821 Common Report Var(flag_section_anchors) Optimization
1822 Access data in the same section from shared anchor points
1823
1824 fsee
1825 Common Ignore
1826 Does nothing.  Preserved for backward compatibility.
1827
1828 fzee
1829 Common Ignore
1830 Does nothing.  Preserved for backward compatibility.
1831
1832 free
1833 Common Report Var(flag_ree) Init(0)
1834 Turn on Redundant Extensions Elimination pass.
1835
1836 fshow-column
1837 Common Report Var(flag_show_column) Init(1)
1838 Show column numbers in diagnostics, when available.  Default on
1839
1840 fshrink-wrap
1841 Common Report Var(flag_shrink_wrap) Optimization
1842 Emit function prologues only before parts of the function that need it,
1843 rather than at the top of the function.
1844
1845 fsignaling-nans
1846 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1847 Disable optimizations observable by IEEE signaling NaNs
1848
1849 fsigned-zeros
1850 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1851 Disable floating point optimizations that ignore the IEEE signedness of zero
1852
1853 fsingle-precision-constant
1854 Common Report Var(flag_single_precision_constant) Optimization
1855 Convert floating point constants to single precision constants
1856
1857 fsplit-ivs-in-unroller
1858 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1859 Split lifetimes of induction variables when loops are unrolled
1860
1861 fsplit-stack
1862 Common Report Var(flag_split_stack) Init(-1)
1863 Generate discontiguous stack frames
1864
1865 fsplit-wide-types
1866 Common Report Var(flag_split_wide_types) Optimization
1867 Split wide types into independent registers
1868
1869 fvariable-expansion-in-unroller
1870 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1871 Apply variable expansion when loops are unrolled
1872
1873 fstack-check=
1874 Common Report RejectNegative Joined
1875 -fstack-check=[no|generic|specific]     Insert stack checking code into the program
1876
1877 fstack-check
1878 Common Alias(fstack-check=, specific, no)
1879 Insert stack checking code into the program.  Same as -fstack-check=specific
1880
1881 fstack-limit
1882 Common Var(common_deferred_options) Defer
1883
1884 fstack-limit-register=
1885 Common RejectNegative Joined Var(common_deferred_options) Defer
1886 -fstack-limit-register=<register>       Trap if the stack goes past <register>
1887
1888 fstack-limit-symbol=
1889 Common RejectNegative Joined Var(common_deferred_options) Defer
1890 -fstack-limit-symbol=<name>     Trap if the stack goes past symbol <name>
1891
1892 fstack-protector
1893 Common Report Var(flag_stack_protect, 1)
1894 Use propolice as a stack protection method
1895
1896 fstack-protector-all
1897 Common Report RejectNegative Var(flag_stack_protect, 2)
1898 Use a stack protection method for every function
1899
1900 fstack-usage
1901 Common RejectNegative Var(flag_stack_usage)
1902 Output stack usage information on a per-function basis
1903
1904 fstrength-reduce
1905 Common Ignore
1906 Does nothing.  Preserved for backward compatibility.
1907
1908 ; Nonzero if we should do (language-dependent) alias analysis.
1909 ; Typically, this analysis will assume that expressions of certain
1910 ; types do not alias expressions of certain other types.  Only used
1911 ; if alias analysis (in general) is enabled.
1912 fstrict-aliasing
1913 Common Report Var(flag_strict_aliasing) Optimization
1914 Assume strict aliasing rules apply
1915
1916 fstrict-overflow
1917 Common Report Var(flag_strict_overflow)
1918 Treat signed overflow as undefined
1919
1920 fsync-libcalls
1921 Common Report Var(flag_sync_libcalls) Init(1)
1922 Implement __atomic operations via libcalls to legacy __sync functions
1923
1924 fsyntax-only
1925 Common Report Var(flag_syntax_only)
1926 Check for syntax errors, then stop
1927
1928 ftest-coverage
1929 Common Report Var(flag_test_coverage)
1930 Create data files needed by \"gcov\"
1931
1932 fthread-jumps
1933 Common Report Var(flag_thread_jumps) Optimization
1934 Perform jump threading optimizations
1935
1936 ftime-report
1937 Common Report Var(time_report)
1938 Report the time taken by each compiler pass
1939
1940 ftls-model=
1941 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
1942 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec]      Set the default thread-local storage code generation model
1943
1944 Enum
1945 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
1946
1947 EnumValue
1948 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
1949
1950 EnumValue
1951 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
1952
1953 EnumValue
1954 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
1955
1956 EnumValue
1957 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
1958
1959 ftoplevel-reorder
1960 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
1961 Reorder top level functions, variables, and asms
1962
1963 ftracer
1964 Common Report Var(flag_tracer)
1965 Perform superblock formation via tail duplication
1966
1967 ; Zero means that floating-point math operations cannot generate a
1968 ; (user-visible) trap.  This is the case, for example, in nonstop
1969 ; IEEE 754 arithmetic.
1970 ftrapping-math
1971 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
1972 Assume floating-point operations can trap
1973
1974 ftrapv
1975 Common Report Var(flag_trapv) Optimization
1976 Trap for signed overflow in addition, subtraction and multiplication
1977
1978 ftree-ccp
1979 Common Report Var(flag_tree_ccp) Optimization
1980 Enable SSA-CCP optimization on trees
1981
1982 ftree-bit-ccp
1983 Common Report Var(flag_tree_bit_ccp) Optimization
1984 Enable SSA-BIT-CCP optimization on trees
1985
1986 ftree-store-ccp
1987 Common Ignore
1988 Does nothing.  Preserved for backward compatibility.
1989
1990 ftree-ch
1991 Common Report Var(flag_tree_ch) Optimization
1992 Enable loop header copying on trees
1993
1994 ftree-coalesce-inlined-vars
1995 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
1996 Enable coalescing of copy-related user variables that are inlined
1997
1998 ftree-coalesce-vars
1999 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2000 Enable coalescing of all copy-related user variables
2001
2002 ftree-copyrename
2003 Common Report Var(flag_tree_copyrename) Optimization
2004 Replace SSA temporaries with better names in copies
2005
2006 ftree-copy-prop
2007 Common Report Var(flag_tree_copy_prop) Optimization
2008 Enable copy propagation on trees
2009
2010 ftree-store-copy-prop
2011 Common Ignore
2012 Does nothing.  Preserved for backward compatibility.
2013
2014 ftree-cselim
2015 Common Report Var(flag_tree_cselim) Init(2) Optimization
2016 Transform condition stores into unconditional ones
2017
2018 ftree-switch-conversion
2019 Common Report Var(flag_tree_switch_conversion) Optimization
2020 Perform conversions of switch initializations.
2021
2022 ftree-dce
2023 Common Report Var(flag_tree_dce) Optimization
2024 Enable SSA dead code elimination optimization on trees
2025
2026 ftree-dominator-opts
2027 Common Report Var(flag_tree_dom) Optimization
2028 Enable dominator optimizations
2029
2030 ftree-tail-merge
2031 Common Report Var(flag_tree_tail_merge) Optimization
2032 Enable tail merging on trees
2033
2034 ftree-dse
2035 Common Report Var(flag_tree_dse) Optimization
2036 Enable dead store elimination
2037
2038 ftree-forwprop
2039 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2040 Enable forward propagation on trees
2041
2042 ftree-fre
2043 Common Report Var(flag_tree_fre) Optimization
2044 Enable Full Redundancy Elimination (FRE) on trees
2045
2046 foptimize-strlen
2047 Common Report Var(flag_optimize_strlen) Optimization
2048 Enable string length optimizations on trees
2049
2050 ftree-loop-distribution
2051 Common Report Var(flag_tree_loop_distribution) Optimization
2052 Enable loop distribution on trees
2053
2054 ftree-loop-distribute-patterns
2055 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2056 Enable loop distribution for patterns transformed into a library call
2057
2058 ftree-loop-im
2059 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2060 Enable loop invariant motion on trees
2061
2062 ftree-loop-linear
2063 Common Alias(floop-interchange)
2064 Enable loop interchange transforms.  Same as -floop-interchange
2065
2066 ftree-loop-ivcanon
2067 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2068 Create canonical induction variables in loops
2069
2070 ftree-loop-optimize
2071 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2072 Enable loop optimizations on tree level
2073
2074 ftree-parallelize-loops=
2075 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2076 Enable automatic parallelization of loops
2077
2078 ftree-phiprop
2079 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2080 Enable hoisting loads from conditional pointers.
2081
2082 ftree-pre
2083 Common Report Var(flag_tree_pre) Optimization
2084 Enable SSA-PRE optimization on trees
2085
2086 ftree-partial-pre
2087 Common Report Var(flag_tree_partial_pre) Optimization
2088 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2089
2090 ftree-pta
2091 Common Report Var(flag_tree_pta) Init(1) Optimization
2092 Perform function-local points-to analysis on trees.
2093
2094 ftree-reassoc
2095 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2096 Enable reassociation on tree level
2097
2098 ftree-salias
2099 Common Ignore
2100 Does nothing.  Preserved for backward compatibility.
2101
2102 ftree-sink
2103 Common Report Var(flag_tree_sink) Optimization
2104 Enable SSA code sinking on trees
2105
2106 ftree-slsr
2107 Common Report Var(flag_tree_slsr) Optimization
2108 Perform straight-line strength reduction
2109
2110 ftree-sra
2111 Common Report Var(flag_tree_sra) Optimization
2112 Perform scalar replacement of aggregates
2113
2114 ftree-ter
2115 Common Report Var(flag_tree_ter) Optimization
2116 Replace temporary expressions in the SSA->normal pass
2117
2118 ftree-lrs
2119 Common Report Var(flag_tree_live_range_split) Optimization
2120 Perform live range splitting during the SSA->normal pass
2121
2122 ftree-vrp
2123 Common Report Var(flag_tree_vrp) Init(0) Optimization
2124 Perform Value Range Propagation on trees
2125
2126 funit-at-a-time
2127 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2128 Compile whole compilation unit at a time
2129
2130 funroll-loops
2131 Common Report Var(flag_unroll_loops) Optimization
2132 Perform loop unrolling when iteration count is known
2133
2134 funroll-all-loops
2135 Common Report Var(flag_unroll_all_loops) Optimization
2136 Perform loop unrolling for all loops
2137
2138 ; Nonzero means that loop optimizer may assume that the induction variables
2139 ; that control loops do not overflow and that the loops with nontrivial
2140 ; exit condition are not infinite
2141 funsafe-loop-optimizations
2142 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2143 Allow loop optimizations to assume that the loops behave in normal way
2144
2145 fassociative-math
2146 Common Report Var(flag_associative_math) SetByCombined
2147 Allow optimization for floating-point arithmetic which may change the
2148 result of the operation due to rounding.
2149
2150 freciprocal-math
2151 Common Report Var(flag_reciprocal_math) SetByCombined
2152 Same as -fassociative-math for expressions which include division.
2153
2154 ; Nonzero means that unsafe floating-point math optimizations are allowed
2155 ; for the sake of speed.  IEEE compliance is not guaranteed, and operations
2156 ; are allowed to assume that their arguments and results are "normal"
2157 ; (e.g., nonnegative for SQRT).
2158 funsafe-math-optimizations
2159 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2160 Allow math optimizations that may violate IEEE or ISO standards
2161
2162 funswitch-loops
2163 Common Report Var(flag_unswitch_loops) Optimization
2164 Perform loop unswitching
2165
2166 funwind-tables
2167 Common Report Var(flag_unwind_tables) Optimization
2168 Just generate unwind tables for exception handling
2169
2170 fuse-linker-plugin
2171 Common Undocumented
2172
2173 ; Positive if we should track variables, negative if we should run
2174 ; the var-tracking pass only to discard debug annotations, zero if
2175 ; we're not to run it.  When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2176 ; will be set according to optimize, debug_info_level and debug_hooks
2177 ; in process_options ().
2178 fvar-tracking
2179 Common Report Var(flag_var_tracking) Init(2) Optimization
2180 Perform variable tracking
2181
2182 ; Positive if we should track variables at assignments, negative if
2183 ; we should run the var-tracking pass only to discard debug
2184 ; annotations.  When flag_var_tracking_assignments ==
2185 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2186 fvar-tracking-assignments
2187 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2188 Perform variable tracking by annotating assignments
2189
2190 ; Nonzero if we should toggle flag_var_tracking_assignments after
2191 ; processing options and computing its default.  */
2192 fvar-tracking-assignments-toggle
2193 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2194 Toggle -fvar-tracking-assignments
2195
2196 fvar-tracking-uninit
2197 Common Report Var(flag_var_tracking_uninit) Optimization
2198 Perform variable tracking and also tag variables that are uninitialized
2199
2200 ftree-vectorize
2201 Common Report Var(flag_tree_vectorize) Optimization
2202 Enable loop vectorization on trees
2203
2204 ftree-vectorizer-verbose=
2205 Common RejectNegative Joined UInteger Var(common_deferred_options) Defer
2206 -ftree-vectorizer-verbose=<number>      This switch is deprecated. Use -fopt-info instead.
2207
2208 ftree-slp-vectorize
2209 Common Report Var(flag_tree_slp_vectorize) Init(2) Optimization
2210 Enable basic block vectorization (SLP) on trees
2211
2212 fvect-cost-model
2213 Common Report Var(flag_vect_cost_model) Optimization
2214 Enable use of cost model in vectorization
2215
2216 ftree-vect-loop-version
2217 Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization
2218 Enable loop versioning when doing loop vectorization on trees
2219
2220 ftree-scev-cprop
2221 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2222 Enable copy propagation of scalar-evolution information.
2223
2224 ; -fverbose-asm causes extra commentary information to be produced in
2225 ; the generated assembly code (to make it more readable).  This option
2226 ; is generally only of use to those who actually need to read the
2227 ; generated assembly code (perhaps while debugging the compiler itself).
2228 ; -fno-verbose-asm, the default, causes the extra information
2229 ; to not be added and is useful when comparing two assembler files.
2230 fverbose-asm
2231 Common Report Var(flag_verbose_asm)
2232 Add extra commentary to assembler output
2233
2234 fvisibility=
2235 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2236 -fvisibility=[default|internal|hidden|protected]        Set the default symbol visibility
2237
2238 Enum
2239 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2240
2241 EnumValue
2242 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2243
2244 EnumValue
2245 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2246
2247 EnumValue
2248 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2249
2250 EnumValue
2251 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2252
2253 fvpt
2254 Common Report Var(flag_value_profile_transformations) Optimization
2255 Use expression value profiles in optimizations
2256
2257 fweb
2258 Common Report Var(flag_web) Init(2) Optimization
2259 Construct webs and split unrelated uses of single variable
2260
2261 ftree-builtin-call-dce
2262 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2263 Enable conditional dead code elimination for builtin calls
2264
2265 fwhole-program
2266 Common Report Var(flag_whole_program) Init(0) Optimization
2267 Perform whole program optimizations
2268
2269 fwrapv
2270 Common Report Var(flag_wrapv) Optimization
2271 Assume signed arithmetic overflow wraps around
2272
2273 fzero-initialized-in-bss
2274 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2275 Put zero initialized data in the bss section
2276
2277 g
2278 Common JoinedOrMissing
2279 Generate debug information in default format
2280
2281 gcoff
2282 Common JoinedOrMissing Negative(gdwarf-)
2283 Generate debug information in COFF format
2284
2285 gdwarf-
2286 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2287 Generate debug information in DWARF v2 (or later) format
2288
2289 ggdb
2290 Common JoinedOrMissing
2291 Generate debug information in default extended format
2292
2293 gno-pubnames
2294 Common RejectNegative Var(debug_generate_pub_sections, 0) Init(-1)
2295 Don't generate DWARF pubnames and pubtypes sections.
2296
2297 gpubnames
2298 Common RejectNegative Var(debug_generate_pub_sections, 1)
2299 Generate DWARF pubnames and pubtypes sections.
2300
2301 gno-record-gcc-switches
2302 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2303 Don't record gcc command line switches in DWARF DW_AT_producer.
2304
2305 grecord-gcc-switches
2306 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2307 Record gcc command line switches in DWARF DW_AT_producer.
2308
2309 gno-split-dwarf
2310 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2311 Don't generate debug information in separate .dwo files
2312
2313 gsplit-dwarf
2314 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2315 Generate debug information in separate .dwo files
2316
2317 gstabs
2318 Common JoinedOrMissing Negative(gstabs+)
2319 Generate debug information in STABS format
2320
2321 gstabs+
2322 Common JoinedOrMissing Negative(gvms)
2323 Generate debug information in extended STABS format
2324
2325 gno-strict-dwarf
2326 Common RejectNegative Var(dwarf_strict,0) Init(0)
2327 Emit DWARF additions beyond selected version
2328
2329 gstrict-dwarf
2330 Common Report RejectNegative Var(dwarf_strict,1)
2331 Don't emit DWARF additions beyond selected version
2332
2333 gtoggle
2334 Common Report Var(flag_gtoggle)
2335 Toggle debug information generation
2336
2337 gvms
2338 Common JoinedOrMissing Negative(gxcoff)
2339 Generate debug information in VMS format
2340
2341 gxcoff
2342 Common JoinedOrMissing Negative(gxcoff+)
2343 Generate debug information in XCOFF format
2344
2345 gxcoff+
2346 Common JoinedOrMissing Negative(gcoff)
2347 Generate debug information in extended XCOFF format
2348
2349 h
2350 Driver Joined Separate
2351
2352 iplugindir=
2353 Common Joined Var(plugindir_string) Init(0)
2354 -iplugindir=<dir>       Set <dir> to be the default plugin directory
2355
2356 l
2357 Driver Joined Separate
2358
2359 n
2360 Driver
2361
2362 no-canonical-prefixes
2363 Driver
2364
2365 nodefaultlibs
2366 Driver
2367
2368 nostartfiles
2369 Driver
2370
2371 nostdlib
2372 Driver
2373
2374 o
2375 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2376 -o <file>       Place output into <file>
2377
2378 p
2379 Common Var(profile_flag)
2380 Enable function profiling
2381
2382 pass-exit-codes
2383 Driver Var(pass_exit_codes)
2384
2385 pedantic
2386 Common Alias(Wpedantic)
2387
2388 pedantic-errors
2389 Common Var(flag_pedantic_errors)
2390 Like -pedantic but issue them as errors
2391
2392 pg
2393 Driver
2394
2395 pipe
2396 Driver Var(use_pipes)
2397
2398 print-file-name=
2399 Driver JoinedOrMissing Var(print_file_name)
2400
2401 print-libgcc-file-name
2402 Driver
2403
2404 print-multi-directory
2405 Driver Var(print_multi_directory)
2406
2407 print-multi-lib
2408 Driver Var(print_multi_lib)
2409
2410 print-multi-os-directory
2411 Driver Var(print_multi_os_directory)
2412
2413 print-prog-name=
2414 Driver JoinedOrMissing Var(print_prog_name)
2415
2416 print-search-dirs
2417 Driver Var(print_search_dirs)
2418
2419 print-sysroot
2420 Driver Var(print_sysroot)
2421
2422 print-sysroot-headers-suffix
2423 Driver Var(print_sysroot_headers_suffix)
2424
2425 quiet
2426 Common Var(quiet_flag) RejectDriver
2427 Do not display functions compiled or elapsed time
2428
2429 r
2430 Driver
2431
2432 s
2433 Driver
2434
2435 save-temps
2436 Driver
2437
2438 save-temps=
2439 Driver Joined
2440
2441 t
2442 Driver
2443
2444 time
2445 Driver Var(report_times)
2446
2447 time=
2448 Driver JoinedOrMissing
2449
2450 u
2451 Driver Joined Separate
2452
2453 undef
2454 Driver
2455 ; C option, but driver must not handle as "-u ndef".
2456
2457 v
2458 Common Driver Var(verbose_flag)
2459 Enable verbose output
2460
2461 version
2462 Common Var(version_flag) RejectDriver
2463 Display the compiler's version
2464
2465 w
2466 Common Var(inhibit_warnings)
2467 Suppress warnings
2468
2469 wrapper
2470 Driver Separate Var(wrapper_string)
2471
2472 x
2473 Driver Joined Separate
2474
2475 shared
2476 Driver RejectNegative Negative(pie)
2477 Create a shared library
2478
2479 shared-libgcc
2480 Driver
2481
2482 specs
2483 Driver Separate Alias(specs=)
2484
2485 specs=
2486 Driver Joined
2487
2488 static
2489 Driver
2490
2491 static-libgcc
2492 Driver
2493
2494 static-libgfortran
2495 Driver
2496 ; Documented for Fortran, but always accepted by driver.
2497
2498 static-libstdc++
2499 Driver
2500
2501 static-libgo
2502 Driver
2503 ; Documented for Go, but always accepted by driver.
2504
2505 symbolic
2506 Driver
2507
2508 pie
2509 Driver RejectNegative Negative(shared)
2510 Create a position independent executable
2511
2512 z
2513 Driver Joined Separate
2514
2515 ; This comment is to ensure we retain the blank line above.