gcc/common.opt

   1 ; Options for the language- and target-independent parts of the compiler.
   2
   3 ; Copyright (C) 2003-2013 Free Software Foundation, Inc.
   4 ;
   5 ; This file is part of GCC.
   6 ;
   7 ; GCC is free software; you can redistribute it and/or modify it under
   8 ; the terms of the GNU General Public License as published by the Free
   9 ; Software Foundation; either version 3, or (at your option) any later
  10 ; version.
  11 ;
  12 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 ; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 ; for more details.
  16 ;
  17 ; You should have received a copy of the GNU General Public License
  18 ; along with GCC; see the file COPYING3.  If not see
  19 ; <http://www.gnu.org/licenses/>.
  20
  21 ; See the GCC internals manual (options.texi) for a description of this file's format.
  22
  23 ; Please try to keep this file in ASCII collating order.
  24
  25 Variable
  26 int target_flags
  27
  28 Variable
  29 int optimize
  30
  31 Variable
  32 int optimize_size
  33
  34 Variable
  35 int optimize_debug
  36
  37 ; Not used directly to control optimizations, only to save -Ofast
  38 ; setting for "optimize" attributes.
  39 Variable
  40 int optimize_fast
  41
  42 ; True if this is the lto front end.  This is used to disable gimple
  43 ; generation and lowering passes that are normally run on the output
  44 ; of a front end.  These passes must be bypassed for lto since they
  45 ; have already been done before the gimple was written.
  46 Variable
  47 bool in_lto_p = false
  48
  49 ; 0 means straightforward implementation of complex divide acceptable.
  50 ; 1 means wide ranges of inputs must work for complex divide.
  51 ; 2 means C99-like requirements for complex multiply and divide.
  52 Variable
  53 int flag_complex_method = 1
  54
  55 ; Nonzero if subexpressions must be evaluated from left-to-right.
  56 Variable
  57 int flag_evaluation_order = 0
  58
  59 ; Language specific warning pass for unused results.
  60 Variable
  61 bool flag_warn_unused_result = false
  62
  63 Variable
  64 int *param_values
  65
  66 ; Nonzero if we should write GIMPLE bytecode for link-time optimization.
  67 Variable
  68 int flag_generate_lto
  69
  70 ; True to warn about any objects definitions whose size is larger
  71 ; than N bytes.  Also want about function definitions whose returned
  72 ; values are larger than N bytes, where N is 'larger_than_size'.
  73 Variable
  74 bool warn_larger_than
  75
  76 Variable
  77 HOST_WIDE_INT larger_than_size
  78
  79 ; True to warn about any function whose frame size is larger
  80 ; than N bytes.
  81 Variable
  82 bool warn_frame_larger_than
  83
  84 Variable
  85 HOST_WIDE_INT frame_larger_than_size
  86
  87 ; Nonzero means we should be saving declaration info into a .X file.
  88 Variable
  89 int flag_gen_aux_info = 0
  90
  91 ; Nonzero if we are compiling code for a shared library, zero for
  92 ; executable.
  93 Variable
  94 int flag_shlib
  95
  96 ; These two are really VEC(char_p,heap) *.
  97
  98 Variable
  99 void *flag_instrument_functions_exclude_functions
 100
 101 Variable
 102 void *flag_instrument_functions_exclude_files
 103
 104 ; Generic structs (e.g. templates not explicitly specialized)
 105 ; may not have a compilation unit associated with them, and so
 106 ; may need to be treated differently from ordinary structs.
 107 ;
 108 ; Structs only handled by reference (indirectly), will also usually
 109 ; not need as much debugging information.
 110
 111 Variable
 112 enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
 113
 114 Variable
 115 enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
 116
 117 ; True if we should exit after parsing options.
 118 Variable
 119 bool exit_after_options
 120
 121 ; Type(s) of debugging information we are producing (if any).  See
 122 ; flag-types.h for the definitions of the different possible types of
 123 ; debugging information.
 124 Variable
 125 enum debug_info_type write_symbols = NO_DEBUG
 126
 127 ; Level of debugging information we are producing.  See flag-types.h
 128 ; for the definitions of the different possible levels.
 129 Variable
 130 enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
 131
 132 ; Nonzero means use GNU-only extensions in the generated symbolic
 133 ; debugging information.  Currently, this only has an effect when
 134 ; write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG.
 135 Variable
 136 bool use_gnu_debug_info_extensions
 137
 138 ; Original value of maximum field alignment in bytes, specified via
 139 ; -fpack-struct=<value>.
 140 Variable
 141 unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
 142
 143 ; Type of stack check.
 144 Variable
 145 enum stack_check_type flag_stack_check = NO_STACK_CHECK
 146
 147 ; True if stack usage information needs to be computed.
 148 Variable
 149 bool flag_stack_usage_info = false
 150
 151 ; -dA causes debug commentary information to be produced in
 152 ; the generated assembly code (to make it more readable).  This option
 153 ; is generally only of use to those who actually need to read the
 154 ; generated assembly code (perhaps while debugging the compiler itself).
 155 ; Currently, this switch is only used by dwarf2out.c; however, it is intended
 156 ; to be a catchall for printing debug information in the assembler file.
 157 Variable
 158 int flag_debug_asm
 159
 160 ; -dP causes the rtl to be emitted as a comment in assembly.
 161 Variable
 162 int flag_dump_rtl_in_asm
 163
 164 ; Whether -da was passed (used only in handle_common_deferred_options).
 165 Variable
 166 bool flag_dump_all_passed
 167
 168 ; Other flags saying which kinds of debugging dump have been requested.
 169
 170 Variable
 171 int rtl_dump_and_exit
 172
 173 Variable
 174 int flag_print_asm_name
 175
 176 ; Name of top-level original source file (what was input to cpp).
 177 ; This comes from the #-command at the beginning of the actual input.
 178 ; If there isn't any there, then this is the cc1 input file name.
 179 Variable
 180 const char *main_input_filename
 181
 182 ; Pointer to base name in main_input_filename, with directories and a
 183 ; single final extension removed, and the length of this base
 184 ; name.
 185
 186 Variable
 187 const char *main_input_basename
 188
 189 Variable
 190 int main_input_baselength
 191
 192 ; Which options have been printed by --help.
 193 Variable
 194 char *help_printed
 195
 196 ; Which enums have been printed by --help.  0 = not printed, no
 197 ; relevant options seen, 1 = relevant option seen, not yet printed, 2
 198 ; = printed.
 199 Variable
 200 char *help_enum_printed
 201
 202 ; The number of columns for --help output.
 203 Variable
 204 unsigned int help_columns
 205
 206 ; Whether this options structure has been through finish_options
 207 Variable
 208 bool flag_opts_finished
 209
 210 ###
 211 Driver
 212
 213 -assemble
 214 Driver Alias(S)
 215
 216 -compile
 217 Driver Alias(c)
 218
 219 -coverage
 220 Driver Alias(coverage)
 221
 222 -debug
 223 Common Alias(g)
 224
 225 -dump
 226 Common Separate Alias(d)
 227
 228 -dump=
 229 Common Joined Alias(d)
 230
 231 -dumpbase
 232 Common Separate Alias(dumpbase)
 233
 234 -dumpdir
 235 Common Separate Alias(dumpdir)
 236
 237 -entry
 238 Driver Separate Alias(e)
 239
 240 -entry=
 241 Driver Joined Alias(e)
 242
 243 -extra-warnings
 244 Common Warning Alias(Wextra)
 245
 246 -for-assembler
 247 Driver Separate Alias(Xassembler)
 248
 249 -for-assembler=
 250 Driver JoinedOrMissing Alias(Xassembler)
 251
 252 -for-linker
 253 Driver Separate Alias(Xlinker)
 254
 255 -for-linker=
 256 Driver JoinedOrMissing Alias(Xlinker)
 257
 258 -force-link
 259 Driver Separate Alias(u)
 260
 261 -force-link=
 262 Driver Joined Alias(u)
 263
 264 -help
 265 Common Driver Var(help_flag)
 266 Display this information
 267
 268 -help=
 269 Common Driver Report Joined
 270 --help=<class>  Display descriptions of a specific class of options.  <class> is one or more of optimizers, target, warnings, undocumented, params
 271
 272 -language
 273 Driver Separate Alias(x)
 274
 275 -language=
 276 Driver Joined Alias(x)
 277
 278 -library-directory
 279 Driver Separate Alias(L)
 280
 281 -library-directory=
 282 Driver Joined Alias(L)
 283
 284 -no-canonical-prefixes
 285 Driver Alias(no-canonical-prefixes)
 286
 287 -no-standard-libraries
 288 Driver Alias(nostdlib)
 289
 290 -no-sysroot-suffix
 291 Driver Var(no_sysroot_suffix)
 292
 293 -no-warnings
 294 Common Alias(w)
 295
 296 -optimize
 297 Common Alias(O)
 298
 299 -output
 300 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
 301
 302 -output=
 303 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
 304
 305 -pass-exit-codes
 306 Driver Alias(pass-exit-codes)
 307
 308 -pedantic
 309 Common Alias(Wpedantic)
 310
 311 -pedantic-errors
 312 Common Alias(pedantic-errors)
 313
 314 -pie
 315 Driver Alias(pie)
 316
 317 -pipe
 318 Driver Alias(pipe)
 319
 320 -prefix
 321 Driver Separate Alias(B)
 322
 323 -prefix=
 324 Driver JoinedOrMissing Alias(B)
 325
 326 -preprocess
 327 Driver Alias(E)
 328
 329 -print-file-name
 330 Driver Separate Alias(print-file-name=)
 331
 332 -print-file-name=
 333 Driver JoinedOrMissing Alias(print-file-name=)
 334
 335 -print-libgcc-file-name
 336 Driver Alias(print-libgcc-file-name)
 337
 338 -print-multi-directory
 339 Driver Alias(print-multi-directory)
 340
 341 -print-multi-lib
 342 Driver Alias(print-multi-lib)
 343
 344 -print-multi-os-directory
 345 Driver Alias(print-multi-os-directory)
 346
 347 -print-multiarch
 348 Driver Alias(print-multiarch)
 349
 350 -print-prog-name
 351 Driver Separate Alias(print-prog-name=)
 352
 353 -print-prog-name=
 354 Driver JoinedOrMissing Alias(print-prog-name=)
 355
 356 -print-search-dirs
 357 Driver Alias(print-search-dirs)
 358
 359 -print-sysroot
 360 Driver Alias(print-sysroot)
 361
 362 -print-sysroot-headers-suffix
 363 Driver Alias(print-sysroot-headers-suffix)
 364
 365 -profile
 366 Common Alias(p)
 367
 368 -save-temps
 369 Driver Alias(save-temps)
 370
 371 -shared
 372 Driver Alias(shared)
 373
 374 -specs
 375 Driver Separate Alias(specs=)
 376
 377 -specs=
 378 Driver Joined Alias(specs=)
 379
 380 -static
 381 Driver Alias(static)
 382
 383 -symbolic
 384 Driver Alias(symbolic)
 385
 386 -target-help
 387 Common Driver
 388 Alias for --help=target
 389
 390 -time
 391 Driver Alias(time)
 392
 393 -verbose
 394 Driver Alias(v)
 395
 396 ;; The driver used to convert options such as --help into forms such
 397 ;; as -fhelp; the following four entries are for compatibility with
 398 ;; any direct uses of those (undocumented) -f forms
 399 fhelp
 400 Common Driver Alias(-help)
 401
 402 fhelp=
 403 Common Driver Joined Alias(-help=)
 404
 405 ftarget-help
 406 Common Driver Alias(-target-help)
 407
 408 fversion
 409 Common Driver Alias(-version)
 410
 411 -param
 412 Common Separate
 413 --param <param>=<value> Set parameter <param> to value.  See below for a complete list of parameters
 414
 415 -param=
 416 Common Joined Alias(-param)
 417
 418 -sysroot
 419 Driver Separate Alias(-sysroot=)
 420
 421 -sysroot=
 422 Driver JoinedOrMissing
 423
 424 -version
 425 Common Driver
 426
 427 B
 428 Driver Joined Separate
 429
 430 E
 431 Driver
 432
 433 L
 434 Driver Joined Separate
 435
 436 N
 437 Driver
 438
 439 O
 440 Common JoinedOrMissing Optimization
 441 -O<number>      Set optimization level to <number>
 442
 443 Os
 444 Common Optimization
 445 Optimize for space rather than speed
 446
 447 Ofast
 448 Common Optimization
 449 Optimize for speed disregarding exact standards compliance
 450
 451 Og
 452 Common Optimization
 453 Optimize for debugging experience rather than speed or size
 454
 455 Q
 456 Driver
 457
 458 Qn
 459 Driver Negative(Qy)
 460
 461 Qy
 462 Driver Negative(Qn)
 463
 464 R
 465 Driver Joined Separate
 466
 467 S
 468 Driver
 469
 470 T
 471 Driver Joined Separate
 472
 473 Tbss
 474 Driver Separate
 475
 476 Tbss=
 477 Driver Joined
 478
 479 Tdata
 480 Driver Separate
 481
 482 Tdata=
 483 Driver Joined
 484
 485 Ttext
 486 Driver Separate
 487
 488 Ttext=
 489 Driver Joined
 490
 491 W
 492 Common RejectNegative Warning Alias(Wextra)
 493 This switch is deprecated; use -Wextra instead
 494
 495 Wa,
 496 Driver JoinedOrMissing
 497
 498 Wl,
 499 Driver JoinedOrMissing
 500
 501 Wp,
 502 Driver JoinedOrMissing
 503
 504 Waggregate-return
 505 Common Var(warn_aggregate_return) Warning
 506 Warn about returning structures, unions or arrays
 507
 508 Warray-bounds
 509 Common Var(warn_array_bounds) Warning
 510 Warn if an array is accessed out of bounds
 511
 512 Wattributes
 513 Common Var(warn_attributes) Init(1) Warning
 514 Warn about inappropriate attribute usage
 515
 516 Wcast-align
 517 Common Var(warn_cast_align) Warning
 518 Warn about pointer casts which increase alignment
 519
 520 Wcpp
 521 Common Var(warn_cpp) Init(1) Warning
 522 Warn when a #warning directive is encountered
 523
 524 Wdeprecated-declarations
 525 Common Var(warn_deprecated_decl) Init(1) Warning
 526 Warn about uses of __attribute__((deprecated)) declarations
 527
 528 Wdisabled-optimization
 529 Common Var(warn_disabled_optimization) Warning
 530 Warn when an optimization pass is disabled
 531
 532 Werror
 533 Common Var(warnings_are_errors)
 534 Treat all warnings as errors
 535
 536 Werror=
 537 Common Joined
 538 Treat specified warning as error
 539
 540 Wextra
 541 Common Var(extra_warnings) Warning
 542 Print extra (possibly unwanted) warnings
 543
 544 Wfatal-errors
 545 Common Var(flag_fatal_errors)
 546 Exit on the first error occurred
 547
 548 Wframe-larger-than=
 549 Common RejectNegative Joined UInteger
 550 -Wframe-larger-than=<number>    Warn if a function's stack frame requires more than <number> bytes
 551
 552 Wfree-nonheap-object
 553 Common Var(warn_free_nonheap_object) Init(1) Warning
 554 Warn when attempting to free a non-heap object
 555
 556 Winline
 557 Common Var(warn_inline) Warning
 558 Warn when an inlined function cannot be inlined
 559
 560 Winvalid-memory-model
 561 Common Var(warn_invalid_memory_model) Init(1) Warning
 562 Warn when an atomic memory model parameter is known to be outside the valid range.
 563
 564 Wlarger-than-
 565 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
 566
 567 Wlarger-than=
 568 Common RejectNegative Joined UInteger Warning
 569 -Wlarger-than=<number>  Warn if an object is larger than <number> bytes
 570
 571 Wunsafe-loop-optimizations
 572 Common Var(warn_unsafe_loop_optimizations) Warning
 573 Warn if the loop cannot be optimized due to nontrivial assumptions.
 574
 575 Wmissing-noreturn
 576 Common Alias(Wsuggest-attribute=noreturn)
 577
 578 Woverflow
 579 Common Var(warn_overflow) Init(1) Warning
 580 Warn about overflow in arithmetic expressions
 581
 582 Wpacked
 583 Common Var(warn_packed) Warning
 584 Warn when the packed attribute has no effect on struct layout
 585
 586 Wpadded
 587 Common Var(warn_padded) Warning
 588 Warn when padding is required to align structure members
 589
 590 Wpedantic
 591 Common Var(pedantic) Warning
 592 Issue warnings needed for strict compliance to the standard
 593
 594 Wshadow
 595 Common Var(warn_shadow) Warning
 596 Warn when one local variable shadows another
 597
 598 Wstack-protector
 599 Common Var(warn_stack_protect) Warning
 600 Warn when not issuing stack smashing protection for some reason
 601
 602 Wstack-usage=
 603 Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
 604 Warn if stack usage might be larger than specified amount
 605
 606 Wstrict-aliasing
 607 Common Warning
 608 Warn about code which might break strict aliasing rules
 609
 610 Wstrict-aliasing=
 611 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
 612 Warn about code which might break strict aliasing rules
 613
 614 Wstrict-overflow
 615 Common Warning
 616 Warn about optimizations that assume that signed overflow is undefined
 617
 618 Wstrict-overflow=
 619 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
 620 Warn about optimizations that assume that signed overflow is undefined
 621
 622 Wsuggest-attribute=const
 623 Common Var(warn_suggest_attribute_const) Warning
 624 Warn about functions which might be candidates for __attribute__((const))
 625
 626 Wsuggest-attribute=pure
 627 Common Var(warn_suggest_attribute_pure) Warning
 628 Warn about functions which might be candidates for __attribute__((pure))
 629
 630 Wsuggest-attribute=noreturn
 631 Common Var(warn_suggest_attribute_noreturn) Warning
 632 Warn about functions which might be candidates for __attribute__((noreturn))
 633
 634 Wsystem-headers
 635 Common Var(warn_system_headers) Warning
 636 Do not suppress warnings from system headers
 637
 638 Wtrampolines
 639 Common Var(warn_trampolines) Warning
 640 Warn whenever a trampoline is generated
 641
 642 Wtype-limits
 643 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
 644 Warn if a comparison is always true or always false due to the limited range of the data type
 645
 646 Wuninitialized
 647 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
 648 Warn about uninitialized automatic variables
 649
 650 Wmaybe-uninitialized
 651 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
 652 Warn about maybe uninitialized automatic variables
 653
 654 Wunreachable-code
 655 Common Ignore
 656 Does nothing. Preserved for backward compatibility.
 657
 658 Wunused
 659 Common Var(warn_unused) Init(0) Warning
 660 Enable all -Wunused- warnings
 661
 662 Wunused-but-set-parameter
 663 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
 664 Warn when a function parameter is only set, otherwise unused
 665
 666 Wunused-but-set-variable
 667 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
 668 Warn when a variable is only set, otherwise unused
 669
 670 Wunused-function
 671 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
 672 Warn when a function is unused
 673
 674 Wunused-label
 675 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
 676 Warn when a label is unused
 677
 678 Wunused-parameter
 679 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
 680 Warn when a function parameter is unused
 681
 682 Wunused-value
 683 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
 684 Warn when an expression value is unused
 685
 686 Wunused-variable
 687 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
 688 Warn when a variable is unused
 689
 690 Wcoverage-mismatch
 691 Common Var(warn_coverage_mismatch) Init(1) Warning
 692 Warn in case profiles in -fprofile-use do not match
 693
 694 Wvector-operation-performance
 695 Common Var(warn_vector_operation_performance) Warning
 696 Warn when a vector operation is compiled outside the SIMD
 697
 698 Xassembler
 699 Driver Separate
 700
 701 Xlinker
 702 Driver Separate
 703
 704 Xpreprocessor
 705 Driver Separate
 706
 707 Z
 708 Driver
 709
 710 aux-info
 711 Common Separate Var(aux_info_file_name)
 712 -aux-info <file>        Emit declaration information into <file>
 713
 714 aux-info=
 715 Common Joined Alias(aux-info)
 716
 717 auxbase
 718 Common Separate RejectDriver Var(aux_base_name)
 719
 720 auxbase-strip
 721 Common Separate RejectDriver
 722
 723 coverage
 724 Driver
 725
 726 c
 727 Driver
 728
 729 d
 730 Common Joined
 731 -d<letters>     Enable dumps from specific passes of the compiler
 732
 733 dumpbase
 734 Common Separate Var(dump_base_name)
 735 -dumpbase <file>        Set the file basename to be used for dumps
 736
 737 dumpdir
 738 Common Separate Var(dump_dir_name)
 739 -dumpdir <dir>  Set the directory name to be used for dumps
 740
 741 dumpmachine
 742 Driver
 743
 744 dumpspecs
 745 Driver
 746
 747 dumpversion
 748 Driver
 749
 750 e
 751 Driver Joined Separate
 752
 753 ; This option has historically been passed down to the linker by an
 754 ; accident of a %{e*} spec, so ensure it continues to be passed down
 755 ; as a single option.  The supported option for this purpose is
 756 ; -rdynamic.  See PR 47390.
 757 export-dynamic
 758 Driver Undocumented
 759
 760 ; The version of the C++ ABI in use.  The following values are allowed:
 761 ;
 762 ; 0: The version of the ABI believed most conformant with the C++ ABI
 763 ;    specification.  This ABI may change as bugs are discovered and fixed.
 764 ;    Therefore, 0 will not necessarily indicate the same ABI in different
 765 ;    versions of G++.
 766 ;
 767 ; 1: The version of the ABI first used in G++ 3.2.
 768 ;
 769 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
 770 ;
 771 ; 3: The version of the ABI that fixes the missing underscore
 772 ;    in template non-type arguments of pointer type.
 773 ;
 774 ; 4: The version of the ABI that introduces unambiguous mangling of
 775 ;    vector types.  First selectable in G++ 4.5.
 776 ;
 777 ; 5: The version of the ABI that ignores attribute const/noreturn
 778 ;    in function pointer mangling, and corrects mangling of decltype and
 779 ;    function parameters used in other parameters and the return type.
 780 ;    First selectable in G++ 4.6.
 781 ;
 782 ; 6: The version of the ABI that doesn't promote scoped enums to int and
 783 ;    changes the mangling of template argument packs, const/static_cast,
 784 ;    prefix ++ and --, and a class scope function used as a template
 785 ;    argument.
 786 ;    First selectable in G++ 4.7.
 787 ;
 788 ; 7: The version of the ABI that treats nullptr_t as a builtin type.
 789 ;    First selectable in G++ 4.8.
 790 ; Additional positive integers will be assigned as new versions of
 791 ; the ABI become the default version of the ABI.
 792 fabi-version=
 793 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(2)
 794
 795 faggressive-loop-optimizations
 796 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
 797 Aggressively optimize loops using language constraints
 798
 799 falign-functions
 800 Common Report Var(align_functions,0) Optimization UInteger
 801 Align the start of functions
 802
 803 falign-functions=
 804 Common RejectNegative Joined UInteger Var(align_functions)
 805
 806 falign-jumps
 807 Common Report Var(align_jumps,0) Optimization UInteger
 808 Align labels which are only reached by jumping
 809
 810 falign-jumps=
 811 Common RejectNegative Joined UInteger Var(align_jumps)
 812
 813 falign-labels
 814 Common Report Var(align_labels,0) Optimization UInteger
 815 Align all labels
 816
 817 falign-labels=
 818 Common RejectNegative Joined UInteger Var(align_labels)
 819
 820 falign-loops
 821 Common Report Var(align_loops,0) Optimization UInteger
 822 Align the start of loops
 823
 824 falign-loops=
 825 Common RejectNegative Joined UInteger Var(align_loops)
 826
 827 fargument-alias
 828 Common Ignore
 829 Does nothing. Preserved for backward compatibility.
 830
 831 fargument-noalias
 832 Common Ignore
 833 Does nothing. Preserved for backward compatibility.
 834
 835 fargument-noalias-global
 836 Common Ignore
 837 Does nothing. Preserved for backward compatibility.
 838
 839 fargument-noalias-anything
 840 Common Ignore
 841 Does nothing. Preserved for backward compatibility.
 842
 843 fsanitize=address
 844 Common Report Var(flag_asan)
 845 Enable AddressSanitizer, a memory error detector
 846
 847 fsanitize=thread
 848 Common Report Var(flag_tsan)
 849 Enable ThreadSanitizer, a data race detector
 850
 851 fasynchronous-unwind-tables
 852 Common Report Var(flag_asynchronous_unwind_tables) Optimization
 853 Generate unwind tables that are exact at each instruction boundary
 854
 855 fauto-inc-dec
 856 Common Report Var(flag_auto_inc_dec) Init(1)
 857 Generate auto-inc/dec instructions
 858
 859 ; -fcheck-bounds causes gcc to generate array bounds checks.
 860 ; For C, C++ and ObjC: defaults off.
 861 ; For Java: defaults to on.
 862 ; For Fortran: defaults to off.
 863 fbounds-check
 864 Common Report Var(flag_bounds_check)
 865 Generate code to check bounds before indexing arrays
 866
 867 fbranch-count-reg
 868 Common Report Var(flag_branch_on_count_reg) Init(1) Optimization
 869 Replace add, compare, branch with branch on count register
 870
 871 fbranch-probabilities
 872 Common Report Var(flag_branch_probabilities) Optimization
 873 Use profiling information for branch probabilities
 874
 875 fbranch-target-load-optimize
 876 Common Report Var(flag_branch_target_load_optimize) Optimization
 877 Perform branch target load optimization before prologue / epilogue threading
 878
 879 fbranch-target-load-optimize2
 880 Common Report Var(flag_branch_target_load_optimize2) Optimization
 881 Perform branch target load optimization after prologue / epilogue threading
 882
 883 fbtr-bb-exclusive
 884 Common Report Var(flag_btr_bb_exclusive) Optimization
 885 Restrict target load migration not to re-use registers in any basic block
 886
 887 fcall-saved-
 888 Common Joined RejectNegative Var(common_deferred_options) Defer
 889 -fcall-saved-<register> Mark <register> as being preserved across functions
 890
 891 fcall-used-
 892 Common Joined RejectNegative Var(common_deferred_options) Defer
 893 -fcall-used-<register>  Mark <register> as being corrupted by function calls
 894
 895 ; Nonzero for -fcaller-saves: allocate values in regs that need to
 896 ; be saved across function calls, if that produces overall better code.
 897 ; Optional now, so people can test it.
 898 fcaller-saves
 899 Common Report Var(flag_caller_saves) Optimization
 900 Save registers around function calls
 901
 902 fcheck-data-deps
 903 Common Report Var(flag_check_data_deps)
 904 Compare the results of several data dependence analyzers.
 905
 906 fcombine-stack-adjustments
 907 Common Report Var(flag_combine_stack_adjustments) Optimization
 908 Looks for opportunities to reduce stack adjustments and stack references.
 909
 910 fcommon
 911 Common Report Var(flag_no_common,0) Optimization
 912 Do not put uninitialized globals in the common section
 913
 914 fcompare-debug
 915 Driver
 916 ; Converted by the driver to -fcompare-debug= options.
 917
 918 fcompare-debug=
 919 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
 920 -fcompare-debug[=<opts>]        Compile with and without e.g. -gtoggle, and compare the final-insns dump
 921
 922 fcompare-debug-second
 923 Common Driver RejectNegative Var(flag_compare_debug)
 924 Run only the second compilation of -fcompare-debug
 925
 926 fcompare-elim
 927 Common Report Var(flag_compare_elim_after_reload) Optimization
 928 Perform comparison elimination after register allocation has finished
 929
 930 fconserve-stack
 931 Common Var(flag_conserve_stack) Optimization
 932 Do not perform optimizations increasing noticeably stack usage
 933
 934 fcprop-registers
 935 Common Report Var(flag_cprop_registers) Optimization
 936 Perform a register copy-propagation optimization pass
 937
 938 fcrossjumping
 939 Common Report Var(flag_crossjumping) Optimization
 940 Perform cross-jumping optimization
 941
 942 fcse-follow-jumps
 943 Common Report Var(flag_cse_follow_jumps) Optimization
 944 When running CSE, follow jumps to their targets
 945
 946 fcse-skip-blocks
 947 Common Ignore
 948 Does nothing.  Preserved for backward compatibility.
 949
 950 fcx-limited-range
 951 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
 952 Omit range reduction step when performing complex division
 953
 954 fcx-fortran-rules
 955 Common Report Var(flag_cx_fortran_rules) Optimization
 956 Complex multiplication and division follow Fortran rules
 957
 958 fdata-sections
 959 Common Report Var(flag_data_sections) Optimization
 960 Place data items into their own section
 961
 962 fdbg-cnt-list
 963 Common Report Var(common_deferred_options) Defer
 964 List all available debugging counters with their limits and counts.
 965
 966 fdbg-cnt=
 967 Common RejectNegative Joined Var(common_deferred_options) Defer
 968 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...]     Set the debug counter limit.
 969
 970 fdebug-prefix-map=
 971 Common Joined RejectNegative Var(common_deferred_options) Defer
 972 Map one directory name to another in debug information
 973
 974 fdebug-types-section
 975 Common Report Var(flag_debug_types_section) Init(0)
 976 Output .debug_types section when using DWARF v4 debuginfo.
 977
 978 ; Nonzero for -fdefer-pop: don't pop args after each function call
 979 ; instead save them up to pop many calls' args with one insns.
 980 fdefer-pop
 981 Common Report Var(flag_defer_pop) Optimization
 982 Defer popping functions args from stack until later
 983
 984 fdelayed-branch
 985 Common Report Var(flag_delayed_branch) Optimization
 986 Attempt to fill delay slots of branch instructions
 987
 988 fdelete-dead-exceptions
 989 Common Report Var(flag_delete_dead_exceptions) Init(0)
 990 Delete dead instructions that may throw exceptions
 991
 992 fdelete-null-pointer-checks
 993 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
 994 Delete useless null pointer checks
 995
 996 fdevirtualize
 997 Common Report Var(flag_devirtualize) Optimization
 998 Try to convert virtual calls to direct ones.
 999
1000 fdiagnostics-show-location=
1001 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1002 -fdiagnostics-show-location=[once|every-line]   How often to emit source location at the beginning of line-wrapped diagnostics
1003
1004 ; Required for these enum values.
1005 SourceInclude
1006 pretty-print.h
1007
1008 Enum
1009 Name(diagnostic_prefixing_rule) Type(int)
1010
1011 EnumValue
1012 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1013
1014 EnumValue
1015 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1016
1017 fdiagnostics-show-caret
1018 Common Var(flag_diagnostics_show_caret) Init(1)
1019 Show the source line with a caret indicating the column
1020
1021 fdiagnostics-show-option
1022 Common Var(flag_diagnostics_show_option) Init(1)
1023 Amend appropriate diagnostic messages with the command line option that controls them
1024
1025 fdisable-
1026 Common Joined RejectNegative Var(common_deferred_options) Defer
1027 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1028
1029 fenable-
1030 Common Joined RejectNegative Var(common_deferred_options) Defer
1031 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1032
1033 fdump-
1034 Common Joined RejectNegative Var(common_deferred_options) Defer
1035 -fdump-<type>   Dump various compiler internals to a file
1036
1037 fdump-final-insns
1038 Driver RejectNegative
1039
1040 fdump-final-insns=
1041 Common RejectNegative Joined Var(flag_dump_final_insns)
1042 -fdump-final-insns=filename     Dump to filename the insns at the end of translation
1043
1044 fdump-go-spec=
1045 Common RejectNegative Joined Var(flag_dump_go_spec)
1046 -fdump-go-spec=filename Write all declarations to file as Go code
1047
1048 fdump-noaddr
1049 Common Report Var(flag_dump_noaddr)
1050 Suppress output of addresses in debugging dumps
1051
1052 fdump-passes
1053 Common Var(flag_dump_passes) Init(0)
1054 Dump optimization passes
1055
1056 fdump-unnumbered
1057 Common Report Var(flag_dump_unnumbered)
1058 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1059
1060 fdump-unnumbered-links
1061 Common Report Var(flag_dump_unnumbered_links)
1062 Suppress output of previous and next insn numbers in debugging dumps
1063
1064 fdwarf2-cfi-asm
1065 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1066 Enable CFI tables via GAS assembler directives.
1067
1068 fearly-inlining
1069 Common Report Var(flag_early_inlining) Init(1) Optimization
1070 Perform early inlining
1071
1072 feliminate-dwarf2-dups
1073 Common Report Var(flag_eliminate_dwarf2_dups)
1074 Perform DWARF2 duplicate elimination
1075
1076 fipa-sra
1077 Common Report Var(flag_ipa_sra) Init(0) Optimization
1078 Perform interprocedural reduction of aggregates
1079
1080 feliminate-unused-debug-symbols
1081 Common Report Var(flag_debug_only_used_symbols)
1082 Perform unused type elimination in debug info
1083
1084 feliminate-unused-debug-types
1085 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1086 Perform unused type elimination in debug info
1087
1088 femit-class-debug-always
1089 Common Report Var(flag_emit_class_debug_always) Init(0)
1090 Do not suppress C++ class debug information.
1091
1092 fexceptions
1093 Common Report Var(flag_exceptions) Optimization
1094 Enable exception handling
1095
1096 fexpensive-optimizations
1097 Common Report Var(flag_expensive_optimizations) Optimization
1098 Perform a number of minor, expensive optimizations
1099
1100 fexcess-precision=
1101 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1102 -fexcess-precision=[fast|standard]      Specify handling of excess floating-point precision
1103
1104 Enum
1105 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1106
1107 EnumValue
1108 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1109
1110 EnumValue
1111 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1112
1113 ffast-math
1114 Common
1115
1116 ffat-lto-objects
1117 Common Var(flag_fat_lto_objects) Init(1)
1118 Output lto objects containing both the intermediate language and binary output.
1119
1120 ffinite-math-only
1121 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1122 Assume no NaNs or infinities are generated
1123
1124 ffixed-
1125 Common Joined RejectNegative Var(common_deferred_options) Defer
1126 -ffixed-<register>      Mark <register> as being unavailable to the compiler
1127
1128 ffloat-store
1129 Common Report Var(flag_float_store) Optimization
1130 Don't allocate floats and doubles in extended-precision registers
1131
1132 fforce-addr
1133 Common Ignore
1134 Does nothing.  Preserved for backward compatibility.
1135
1136 fforward-propagate
1137 Common Report Var(flag_forward_propagate) Optimization
1138 Perform a forward propagation pass on RTL
1139
1140 ffp-contract=
1141 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1142 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1143
1144 Enum
1145 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1146
1147 EnumValue
1148 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1149
1150 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1151 EnumValue
1152 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1153
1154 EnumValue
1155 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1156
1157 ; Nonzero means don't put addresses of constant functions in registers.
1158 ; Used for compiling the Unix kernel, where strange substitutions are
1159 ; done on the assembly output.
1160 ffunction-cse
1161 Common Report Var(flag_no_function_cse,0)
1162 Allow function addresses to be held in registers
1163
1164 ffunction-sections
1165 Common Report Var(flag_function_sections)
1166 Place each function into its own section
1167
1168 fgcse
1169 Common Report Var(flag_gcse) Optimization
1170 Perform global common subexpression elimination
1171
1172 fgcse-lm
1173 Common Report Var(flag_gcse_lm) Init(1) Optimization
1174 Perform enhanced load motion during global common subexpression elimination
1175
1176 fgcse-sm
1177 Common Report Var(flag_gcse_sm) Init(0) Optimization
1178 Perform store motion after global common subexpression elimination
1179
1180 fgcse-las
1181 Common Report Var(flag_gcse_las) Init(0) Optimization
1182 Perform redundant load after store elimination in global common subexpression
1183 elimination
1184
1185 fgcse-after-reload
1186 Common Report Var(flag_gcse_after_reload) Optimization
1187 Perform global common subexpression elimination after register allocation
1188 has finished
1189
1190 ; This option is not documented yet as its semantics will change.
1191 fgraphite
1192 Common Report Var(flag_graphite)
1193 Enable in and out of Graphite representation
1194
1195 fgraphite-identity
1196 Common Report Var(flag_graphite_identity) Optimization
1197 Enable Graphite Identity transformation
1198
1199 fhoist-adjacent-loads
1200 Common Report Var(flag_hoist_adjacent_loads) Optimization
1201 Enable hoisting adjacent loads to encourage generating conditional move
1202 instructions
1203
1204 floop-parallelize-all
1205 Common Report Var(flag_loop_parallelize_all) Optimization
1206 Mark all loops as parallel
1207
1208 floop-strip-mine
1209 Common Report Var(flag_loop_strip_mine) Optimization
1210 Enable Loop Strip Mining transformation
1211
1212 floop-interchange
1213 Common Report Var(flag_loop_interchange) Optimization
1214 Enable Loop Interchange transformation
1215
1216 floop-block
1217 Common Report Var(flag_loop_block) Optimization
1218 Enable Loop Blocking transformation
1219
1220 fgnu-tm
1221 Common Report Var(flag_tm)
1222 Enable support for GNU transactional memory
1223
1224 floop-flatten
1225 Common Ignore
1226 Does nothing. Preserved for backward compatibility.
1227
1228 floop-nest-optimize
1229 Common Report Var(flag_loop_optimize_isl) Optimization
1230 Enable the ISL based loop nest optimizer
1231
1232 fstrict-volatile-bitfields
1233 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1234 Force bitfield accesses to match their type width
1235
1236 fguess-branch-probability
1237 Common Report Var(flag_guess_branch_prob) Optimization
1238 Enable guessing of branch probabilities
1239
1240 ; Nonzero means ignore `#ident' directives.  0 means handle them.
1241 ; Generate position-independent code for executables if possible
1242 ; On SVR4 targets, it also controls whether or not to emit a
1243 ; string identifying the compiler.
1244 fident
1245 Common Report Var(flag_no_ident,0)
1246 Process #ident directives
1247
1248 fif-conversion
1249 Common Report Var(flag_if_conversion) Optimization
1250 Perform conversion of conditional jumps to branchless equivalents
1251
1252 fif-conversion2
1253 Common Report Var(flag_if_conversion2) Optimization
1254 Perform conversion of conditional jumps to conditional execution
1255
1256 fstack-reuse=
1257 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1258 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1259
1260 Enum
1261 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1262
1263 EnumValue
1264 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1265
1266 EnumValue
1267 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1268
1269 EnumValue
1270 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1271
1272 ftree-loop-if-convert
1273 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1274 Convert conditional jumps in innermost loops to branchless equivalents
1275
1276 ftree-loop-if-convert-stores
1277 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1278 Also if-convert conditional jumps containing memory writes
1279
1280 ; -finhibit-size-directive inhibits output of .size for ELF.
1281 ; This is used only for compiling crtstuff.c,
1282 ; and it may be extended to other effects
1283 ; needed for crtstuff.c on other systems.
1284 finhibit-size-directive
1285 Common Report Var(flag_inhibit_size_directive)
1286 Do not generate .size directives
1287
1288 findirect-inlining
1289 Common Report Var(flag_indirect_inlining)
1290 Perform indirect inlining
1291
1292 ; General flag to enable inlining.  Specifying -fno-inline will disable
1293 ; all inlining apart from always-inline functions.
1294 finline
1295 Common Report Var(flag_no_inline,0) Init(0) Optimization
1296 Enable inlining of function declared \"inline\", disabling disables all inlining
1297
1298 finline-small-functions
1299 Common Report Var(flag_inline_small_functions) Optimization
1300 Integrate functions into their callers when code size is known not to grow
1301
1302 finline-functions
1303 Common Report Var(flag_inline_functions) Optimization
1304 Integrate functions not declared \"inline\" into their callers when profitable
1305
1306 finline-functions-called-once
1307 Common Report Var(flag_inline_functions_called_once) Optimization
1308 Integrate functions only required by their single caller
1309
1310 finline-limit-
1311 Common RejectNegative Joined Alias(finline-limit=)
1312
1313 finline-limit=
1314 Common RejectNegative Joined UInteger
1315 -finline-limit=<number> Limit the size of inlined functions to <number>
1316
1317 finline-atomics
1318 Common Report Var(flag_inline_atomics) Init(1) Optimization
1319 Inline __atomic operations when a lock free instruction sequence is available.
1320
1321 finstrument-functions
1322 Common Report Var(flag_instrument_function_entry_exit)
1323 Instrument function entry and exit with profiling calls
1324
1325 finstrument-functions-exclude-function-list=
1326 Common RejectNegative Joined
1327 -finstrument-functions-exclude-function-list=name,...  Do not instrument listed functions
1328
1329 finstrument-functions-exclude-file-list=
1330 Common RejectNegative Joined
1331 -finstrument-functions-exclude-file-list=filename,...  Do not instrument functions listed in files
1332
1333 fipa-cp
1334 Common Report Var(flag_ipa_cp) Optimization
1335 Perform Interprocedural constant propagation
1336
1337 fipa-cp-clone
1338 Common Report Var(flag_ipa_cp_clone) Optimization
1339 Perform cloning to make Interprocedural constant propagation stronger
1340
1341 fipa-profile
1342 Common Report Var(flag_ipa_profile) Init(0) Optimization
1343 Perform interprocedural profile propagation
1344
1345 fipa-pta
1346 Common Report Var(flag_ipa_pta) Init(0) Optimization
1347 Perform interprocedural points-to analysis
1348
1349 fipa-pure-const
1350 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1351 Discover pure and const functions
1352
1353 fipa-reference
1354 Common Report Var(flag_ipa_reference) Init(0) Optimization
1355 Discover readonly and non addressable static variables
1356
1357 fipa-matrix-reorg
1358 Common Ignore
1359 Does nothing. Preserved for backward compatibility.
1360
1361 fipa-struct-reorg
1362 Common Ignore
1363 Does nothing. Preserved for backward compatibility.
1364
1365 fira-algorithm=
1366 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1367 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1368
1369 Enum
1370 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1371
1372 EnumValue
1373 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1374
1375 EnumValue
1376 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1377
1378 fira-region=
1379 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1380 -fira-region=[one|all|mixed] Set regions for IRA
1381
1382 Enum
1383 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1384
1385 EnumValue
1386 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1387
1388 EnumValue
1389 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1390
1391 EnumValue
1392 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1393
1394 fira-hoist-pressure
1395 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1396 Use IRA based register pressure calculation
1397 in RTL hoist optimizations.
1398
1399 fira-loop-pressure
1400 Common Report Var(flag_ira_loop_pressure)
1401 Use IRA based register pressure calculation
1402 in RTL loop optimizations.
1403
1404 fira-share-save-slots
1405 Common Report Var(flag_ira_share_save_slots) Init(1)
1406 Share slots for saving different hard registers.
1407
1408 fira-share-spill-slots
1409 Common Report Var(flag_ira_share_spill_slots) Init(1)
1410 Share stack slots for spilled pseudo-registers.
1411
1412 fira-verbose=
1413 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1414 -fira-verbose=<number>  Control IRA's level of diagnostic messages.
1415
1416 fivopts
1417 Common Report Var(flag_ivopts) Init(1) Optimization
1418 Optimize induction variables on trees
1419
1420 fjump-tables
1421 Common Var(flag_jump_tables) Init(1) Optimization
1422 Use jump tables for sufficiently large switch statements
1423
1424 fkeep-inline-functions
1425 Common Report Var(flag_keep_inline_functions)
1426 Generate code for functions even if they are fully inlined
1427
1428 fkeep-static-consts
1429 Common Report Var(flag_keep_static_consts) Init(1)
1430 Emit static const variables even if they are not used
1431
1432 fleading-underscore
1433 Common Report Var(flag_leading_underscore) Init(-1)
1434 Give external symbols a leading underscore
1435
1436 floop-optimize
1437 Common Ignore
1438 Does nothing.  Preserved for backward compatibility.
1439
1440 flto
1441 Common
1442 Enable link-time optimization.
1443
1444 flto=
1445 Common RejectNegative Joined Var(flag_lto)
1446 Link-time optimization with number of parallel jobs or jobserver.
1447
1448 flto-partition=1to1
1449 Common Var(flag_lto_partition_1to1)
1450 Partition symbols and vars at linktime based on object files they originate from
1451
1452 flto-partition=balanced
1453 Common Var(flag_lto_partition_balanced)
1454 Partition functions and vars at linktime into approximately same sized buckets
1455
1456 flto-partition=max
1457 Common Var(flag_lto_partition_max)
1458 Put every symbol into separate partition
1459
1460 flto-partition=none
1461 Common Var(flag_lto_partition_none)
1462 Disable partioning and streaming
1463
1464 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1465 flto-compression-level=
1466 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1467 -flto-compression-level=<number>        Use zlib compression level <number> for IL
1468
1469 flto-report
1470 Common Report Var(flag_lto_report) Init(0)
1471 Report various link-time optimization statistics
1472
1473 fmath-errno
1474 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1475 Set errno after built-in math functions
1476
1477 fmax-errors=
1478 Common Joined RejectNegative UInteger Var(flag_max_errors)
1479 -fmax-errors=<number>   Maximum number of errors to report
1480
1481 fmem-report
1482 Common Report Var(mem_report)
1483 Report on permanent memory allocation
1484
1485 fmem-report-wpa
1486 Common Report Var(mem_report_wpa)
1487 Report on permanent memory allocation in WPA only
1488
1489 ; This will attempt to merge constant section constants, if 1 only
1490 ; string constants and constants from constant pool, if 2 also constant
1491 ; variables.
1492 fmerge-all-constants
1493 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1494 Attempt to merge identical constants and constant variables
1495
1496 fmerge-constants
1497 Common Report Var(flag_merge_constants,1) Optimization
1498 Attempt to merge identical constants across compilation units
1499
1500 fmerge-debug-strings
1501 Common Report Var(flag_merge_debug_strings) Init(1)
1502 Attempt to merge identical debug strings across compilation units
1503
1504 fmessage-length=
1505 Common RejectNegative Joined UInteger
1506 -fmessage-length=<number>       Limit diagnostics to <number> characters per line.  0 suppresses line-wrapping
1507
1508 fmodulo-sched
1509 Common Report Var(flag_modulo_sched) Optimization
1510 Perform SMS based modulo scheduling before the first scheduling pass
1511
1512 fmodulo-sched-allow-regmoves
1513 Common Report Var(flag_modulo_sched_allow_regmoves)
1514 Perform SMS based modulo scheduling with register moves allowed
1515
1516 fmove-loop-invariants
1517 Common Report Var(flag_move_loop_invariants) Init(1) Optimization
1518 Move loop invariant computations out of loops
1519
1520 fdce
1521 Common Var(flag_dce) Init(1) Optimization
1522 Use the RTL dead code elimination pass
1523
1524 fdse
1525 Common Var(flag_dse) Init(1) Optimization
1526 Use the RTL dead store elimination pass
1527
1528 freschedule-modulo-scheduled-loops
1529 Common Report Var(flag_resched_modulo_sched) Optimization
1530 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1531
1532 fnon-call-exceptions
1533 Common Report Var(flag_non_call_exceptions) Optimization
1534 Support synchronous non-call exceptions
1535
1536 fomit-frame-pointer
1537 Common Report Var(flag_omit_frame_pointer) Optimization
1538 When possible do not generate stack frames
1539
1540 fopt-info
1541 Common Report Var(flag_opt_info) Optimization
1542 Enable all optimization info dumps on stderr
1543
1544 fopt-info-
1545 Common Joined RejectNegative Var(common_deferred_options) Defer
1546 -fopt-info[-<type>=filename]    Dump compiler optimization details
1547
1548 foptimize-register-move
1549 Common Report Var(flag_regmove) Optimization
1550 Do the full register move optimization pass
1551
1552 foptimize-sibling-calls
1553 Common Report Var(flag_optimize_sibling_calls) Optimization
1554 Optimize sibling and tail recursive calls
1555
1556 fpartial-inlining
1557 Common Report Var(flag_partial_inlining)
1558 Perform partial inlining
1559
1560 fpre-ipa-mem-report
1561 Common Report Var(pre_ipa_mem_report)
1562 Report on memory allocation before interprocedural optimization
1563
1564 fpost-ipa-mem-report
1565 Common Report Var(post_ipa_mem_report)
1566 Report on memory allocation before interprocedural optimization
1567
1568 fpack-struct
1569 Common Report Var(flag_pack_struct) Optimization
1570 Pack structure members together without holes
1571
1572 fpack-struct=
1573 Common RejectNegative Joined UInteger Optimization
1574 -fpack-struct=<number>  Set initial maximum structure member alignment
1575
1576 fpcc-struct-return
1577 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1578 Return small aggregates in memory, not registers
1579
1580 fpeel-loops
1581 Common Report Var(flag_peel_loops) Optimization
1582 Perform loop peeling
1583
1584 fpeephole
1585 Common Report Var(flag_no_peephole,0) Optimization
1586 Enable machine specific peephole optimizations
1587
1588 fpeephole2
1589 Common Report Var(flag_peephole2) Optimization
1590 Enable an RTL peephole pass before sched2
1591
1592 fPIC
1593 Common Report Var(flag_pic,2) Negative(fPIE)
1594 Generate position-independent code if possible (large mode)
1595
1596 fPIE
1597 Common Report Var(flag_pie,2) Negative(fpic)
1598 Generate position-independent code for executables if possible (large mode)
1599
1600 fpic
1601 Common Report Var(flag_pic,1) Negative(fpie)
1602 Generate position-independent code if possible (small mode)
1603
1604 fpie
1605 Common Report Var(flag_pie,1) Negative(fPIC)
1606 Generate position-independent code for executables if possible (small mode)
1607
1608 fplugin=
1609 Common Joined RejectNegative Var(common_deferred_options) Defer
1610 Specify a plugin to load
1611
1612 fplugin-arg-
1613 Common Joined RejectNegative Var(common_deferred_options) Defer
1614 -fplugin-arg-<name>-<key>[=<value>]     Specify argument <key>=<value> for plugin <name>
1615
1616 fpredictive-commoning
1617 Common Report Var(flag_predictive_commoning) Optimization
1618 Run predictive commoning optimization.
1619
1620 fprefetch-loop-arrays
1621 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1622 Generate prefetch instructions, if available, for arrays in loops
1623
1624 fprofile
1625 Common Report Var(profile_flag)
1626 Enable basic program profiling code
1627
1628 fprofile-arcs
1629 Common Report Var(profile_arc_flag)
1630 Insert arc-based program profiling code
1631
1632 fprofile-dir=
1633 Common Joined RejectNegative Var(profile_data_prefix)
1634 Set the top-level directory for storing the profile data.
1635 The default is 'pwd'.
1636
1637 fprofile-correction
1638 Common Report Var(flag_profile_correction)
1639 Enable correction of flow inconsistent profile data input
1640
1641 fprofile-generate
1642 Common
1643 Enable common options for generating profile info for profile feedback directed optimizations
1644
1645 fprofile-generate=
1646 Common Joined RejectNegative
1647 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1648
1649 fprofile-use
1650 Common Var(flag_profile_use)
1651 Enable common options for performing profile feedback directed optimizations
1652
1653 fprofile-use=
1654 Common Joined RejectNegative
1655 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1656
1657 fprofile-values
1658 Common Report Var(flag_profile_values)
1659 Insert code to profile values of expressions
1660
1661 fprofile-report
1662 Common Report Var(profile_report)
1663 Report on consistency of profile
1664
1665 frandom-seed
1666 Common Var(common_deferred_options) Defer
1667
1668 frandom-seed=
1669 Common Joined RejectNegative Var(common_deferred_options) Defer
1670 -frandom-seed=<string>  Make compile reproducible using <string>
1671
1672 ; This switch causes the command line that was used to create an
1673 ; object file to be recorded into the object file.  The exact format
1674 ; of this recording is target and binary file format dependent.
1675 ; It is related to the -fverbose-asm switch, but that switch only
1676 ; records information in the assembler output file as comments, so
1677 ; they never reach the object file.
1678 frecord-gcc-switches
1679 Common Report Var(flag_record_gcc_switches)
1680 Record gcc command line switches in the object file.
1681
1682 freg-struct-return
1683 Common Report Var(flag_pcc_struct_return,0) Optimization
1684 Return small aggregates in registers
1685
1686 fregmove
1687 Common Report Var(flag_regmove) Optimization
1688 Enables a register move optimization
1689
1690 frename-registers
1691 Common Report Var(flag_rename_registers) Init(2) Optimization
1692 Perform a register renaming optimization pass
1693
1694 freorder-blocks
1695 Common Report Var(flag_reorder_blocks) Optimization
1696 Reorder basic blocks to improve code placement
1697
1698 freorder-blocks-and-partition
1699 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1700 Reorder basic blocks and partition into hot and cold sections
1701
1702 freorder-functions
1703 Common Report Var(flag_reorder_functions) Optimization
1704 Reorder functions to improve code placement
1705
1706 frerun-cse-after-loop
1707 Common Report Var(flag_rerun_cse_after_loop) Optimization
1708 Add a common subexpression elimination pass after loop optimizations
1709
1710 frerun-loop-opt
1711 Common Ignore
1712 Does nothing.  Preserved for backward compatibility.
1713
1714 frounding-math
1715 Common Report Var(flag_rounding_math) Optimization SetByCombined
1716 Disable optimizations that assume default FP rounding behavior
1717
1718 fsched-interblock
1719 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1720 Enable scheduling across basic blocks
1721
1722 fsched-pressure
1723 Common Report Var(flag_sched_pressure) Init(0) Optimization
1724 Enable register pressure sensitive insn scheduling
1725
1726 fsched-spec
1727 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1728 Allow speculative motion of non-loads
1729
1730 fsched-spec-load
1731 Common Report Var(flag_schedule_speculative_load) Optimization
1732 Allow speculative motion of some loads
1733
1734 fsched-spec-load-dangerous
1735 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1736 Allow speculative motion of more loads
1737
1738 fsched-verbose=
1739 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1740 -fsched-verbose=<number>        Set the verbosity level of the scheduler
1741
1742 fsched2-use-superblocks
1743 Common Report Var(flag_sched2_use_superblocks) Optimization
1744 If scheduling post reload, do superblock scheduling
1745
1746 fsched2-use-traces
1747 Common Ignore
1748 Does nothing.  Preserved for backward compatibility.
1749
1750 fschedule-insns
1751 Common Report Var(flag_schedule_insns) Optimization
1752 Reschedule instructions before register allocation
1753
1754 fschedule-insns2
1755 Common Report Var(flag_schedule_insns_after_reload) Optimization
1756 Reschedule instructions after register allocation
1757
1758 ; This flag should be on when a target implements non-trivial
1759 ; scheduling hooks, maybe saving some information for its own sake.
1760 ; On IA64, for example, this is used for correct bundling.
1761 fselective-scheduling
1762 Common Report Var(flag_selective_scheduling) Optimization
1763 Schedule instructions using selective scheduling algorithm
1764
1765 fselective-scheduling2
1766 Common Report Var(flag_selective_scheduling2) Optimization
1767 Run selective scheduling after reload
1768
1769 fsel-sched-pipelining
1770 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1771 Perform software pipelining of inner loops during selective scheduling
1772
1773 fsel-sched-pipelining-outer-loops
1774 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1775 Perform software pipelining of outer loops during selective scheduling
1776
1777 fsel-sched-reschedule-pipelined
1778 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1779 Reschedule pipelined regions without pipelining
1780
1781 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1782 ; of stalled insns into the ready list.
1783 fsched-stalled-insns
1784 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1785 Allow premature scheduling of queued insns
1786
1787 fsched-stalled-insns=
1788 Common RejectNegative Joined UInteger
1789 -fsched-stalled-insns=<number>  Set number of queued insns that can be prematurely scheduled
1790
1791 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1792 ; be examined for a dependency on a stalled insn that is candidate for
1793 ; premature removal from the queue of stalled insns into the ready list (has
1794 ; an effect only if the flag 'sched_stalled_insns' is set).
1795 fsched-stalled-insns-dep
1796 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1797 Set dependence distance checking in premature scheduling of queued insns
1798
1799 fsched-stalled-insns-dep=
1800 Common RejectNegative Joined UInteger
1801 -fsched-stalled-insns-dep=<number>      Set dependence distance checking in premature scheduling of queued insns
1802
1803 fsched-group-heuristic
1804 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1805 Enable the group heuristic in the scheduler
1806
1807 fsched-critical-path-heuristic
1808 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1809 Enable the critical path heuristic in the scheduler
1810
1811 fsched-spec-insn-heuristic
1812 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1813 Enable the speculative instruction heuristic in the scheduler
1814
1815 fsched-rank-heuristic
1816 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1817 Enable the rank heuristic in the scheduler
1818
1819 fsched-last-insn-heuristic
1820 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1821 Enable the last instruction heuristic in the scheduler
1822
1823 fsched-dep-count-heuristic
1824 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1825 Enable the dependent count heuristic in the scheduler
1826
1827 fsection-anchors
1828 Common Report Var(flag_section_anchors) Optimization
1829 Access data in the same section from shared anchor points
1830
1831 fsee
1832 Common Ignore
1833 Does nothing.  Preserved for backward compatibility.
1834
1835 fzee
1836 Common Ignore
1837 Does nothing.  Preserved for backward compatibility.
1838
1839 free
1840 Common Report Var(flag_ree) Init(0)
1841 Turn on Redundant Extensions Elimination pass.
1842
1843 fshow-column
1844 Common Report Var(flag_show_column) Init(1)
1845 Show column numbers in diagnostics, when available.  Default on
1846
1847 fshrink-wrap
1848 Common Report Var(flag_shrink_wrap) Optimization
1849 Emit function prologues only before parts of the function that need it,
1850 rather than at the top of the function.
1851
1852 fsignaling-nans
1853 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1854 Disable optimizations observable by IEEE signaling NaNs
1855
1856 fsigned-zeros
1857 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1858 Disable floating point optimizations that ignore the IEEE signedness of zero
1859
1860 fsingle-precision-constant
1861 Common Report Var(flag_single_precision_constant) Optimization
1862 Convert floating point constants to single precision constants
1863
1864 fsplit-ivs-in-unroller
1865 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1866 Split lifetimes of induction variables when loops are unrolled
1867
1868 fsplit-stack
1869 Common Report Var(flag_split_stack) Init(-1)
1870 Generate discontiguous stack frames
1871
1872 fsplit-wide-types
1873 Common Report Var(flag_split_wide_types) Optimization
1874 Split wide types into independent registers
1875
1876 fvariable-expansion-in-unroller
1877 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1878 Apply variable expansion when loops are unrolled
1879
1880 fstack-check=
1881 Common Report RejectNegative Joined
1882 -fstack-check=[no|generic|specific]     Insert stack checking code into the program
1883
1884 fstack-check
1885 Common Alias(fstack-check=, specific, no)
1886 Insert stack checking code into the program.  Same as -fstack-check=specific
1887
1888 fstack-limit
1889 Common Var(common_deferred_options) Defer
1890
1891 fstack-limit-register=
1892 Common RejectNegative Joined Var(common_deferred_options) Defer
1893 -fstack-limit-register=<register>       Trap if the stack goes past <register>
1894
1895 fstack-limit-symbol=
1896 Common RejectNegative Joined Var(common_deferred_options) Defer
1897 -fstack-limit-symbol=<name>     Trap if the stack goes past symbol <name>
1898
1899 fstack-protector
1900 Common Report Var(flag_stack_protect, 1)
1901 Use propolice as a stack protection method
1902
1903 fstack-protector-all
1904 Common Report RejectNegative Var(flag_stack_protect, 2)
1905 Use a stack protection method for every function
1906
1907 fstack-usage
1908 Common RejectNegative Var(flag_stack_usage)
1909 Output stack usage information on a per-function basis
1910
1911 fstrength-reduce
1912 Common Ignore
1913 Does nothing.  Preserved for backward compatibility.
1914
1915 ; Nonzero if we should do (language-dependent) alias analysis.
1916 ; Typically, this analysis will assume that expressions of certain
1917 ; types do not alias expressions of certain other types.  Only used
1918 ; if alias analysis (in general) is enabled.
1919 fstrict-aliasing
1920 Common Report Var(flag_strict_aliasing) Optimization
1921 Assume strict aliasing rules apply
1922
1923 fstrict-overflow
1924 Common Report Var(flag_strict_overflow)
1925 Treat signed overflow as undefined
1926
1927 fsync-libcalls
1928 Common Report Var(flag_sync_libcalls) Init(1)
1929 Implement __atomic operations via libcalls to legacy __sync functions
1930
1931 fsyntax-only
1932 Common Report Var(flag_syntax_only)
1933 Check for syntax errors, then stop
1934
1935 ftest-coverage
1936 Common Report Var(flag_test_coverage)
1937 Create data files needed by \"gcov\"
1938
1939 fthread-jumps
1940 Common Report Var(flag_thread_jumps) Optimization
1941 Perform jump threading optimizations
1942
1943 ftime-report
1944 Common Report Var(time_report)
1945 Report the time taken by each compiler pass
1946
1947 ftls-model=
1948 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
1949 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec]      Set the default thread-local storage code generation model
1950
1951 Enum
1952 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
1953
1954 EnumValue
1955 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
1956
1957 EnumValue
1958 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
1959
1960 EnumValue
1961 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
1962
1963 EnumValue
1964 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
1965
1966 ftoplevel-reorder
1967 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
1968 Reorder top level functions, variables, and asms
1969
1970 ftracer
1971 Common Report Var(flag_tracer)
1972 Perform superblock formation via tail duplication
1973
1974 ; Zero means that floating-point math operations cannot generate a
1975 ; (user-visible) trap.  This is the case, for example, in nonstop
1976 ; IEEE 754 arithmetic.
1977 ftrapping-math
1978 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
1979 Assume floating-point operations can trap
1980
1981 ftrapv
1982 Common Report Var(flag_trapv) Optimization
1983 Trap for signed overflow in addition, subtraction and multiplication
1984
1985 ftree-ccp
1986 Common Report Var(flag_tree_ccp) Optimization
1987 Enable SSA-CCP optimization on trees
1988
1989 ftree-bit-ccp
1990 Common Report Var(flag_tree_bit_ccp) Optimization
1991 Enable SSA-BIT-CCP optimization on trees
1992
1993 ftree-store-ccp
1994 Common Ignore
1995 Does nothing.  Preserved for backward compatibility.
1996
1997 ftree-ch
1998 Common Report Var(flag_tree_ch) Optimization
1999 Enable loop header copying on trees
2000
2001 ftree-coalesce-inlined-vars
2002 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2003 Enable coalescing of copy-related user variables that are inlined
2004
2005 ftree-coalesce-vars
2006 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2007 Enable coalescing of all copy-related user variables
2008
2009 ftree-copyrename
2010 Common Report Var(flag_tree_copyrename) Optimization
2011 Replace SSA temporaries with better names in copies
2012
2013 ftree-copy-prop
2014 Common Report Var(flag_tree_copy_prop) Optimization
2015 Enable copy propagation on trees
2016
2017 ftree-store-copy-prop
2018 Common Ignore
2019 Does nothing.  Preserved for backward compatibility.
2020
2021 ftree-cselim
2022 Common Report Var(flag_tree_cselim) Init(2) Optimization
2023 Transform condition stores into unconditional ones
2024
2025 ftree-switch-conversion
2026 Common Report Var(flag_tree_switch_conversion) Optimization
2027 Perform conversions of switch initializations.
2028
2029 ftree-dce
2030 Common Report Var(flag_tree_dce) Optimization
2031 Enable SSA dead code elimination optimization on trees
2032
2033 ftree-dominator-opts
2034 Common Report Var(flag_tree_dom) Optimization
2035 Enable dominator optimizations
2036
2037 ftree-tail-merge
2038 Common Report Var(flag_tree_tail_merge) Optimization
2039 Enable tail merging on trees
2040
2041 ftree-dse
2042 Common Report Var(flag_tree_dse) Optimization
2043 Enable dead store elimination
2044
2045 ftree-forwprop
2046 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2047 Enable forward propagation on trees
2048
2049 ftree-fre
2050 Common Report Var(flag_tree_fre) Optimization
2051 Enable Full Redundancy Elimination (FRE) on trees
2052
2053 foptimize-strlen
2054 Common Report Var(flag_optimize_strlen) Optimization
2055 Enable string length optimizations on trees
2056
2057 ftree-loop-distribution
2058 Common Report Var(flag_tree_loop_distribution) Optimization
2059 Enable loop distribution on trees
2060
2061 ftree-loop-distribute-patterns
2062 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2063 Enable loop distribution for patterns transformed into a library call
2064
2065 ftree-loop-im
2066 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2067 Enable loop invariant motion on trees
2068
2069 ftree-loop-linear
2070 Common Alias(floop-interchange)
2071 Enable loop interchange transforms.  Same as -floop-interchange
2072
2073 ftree-loop-ivcanon
2074 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2075 Create canonical induction variables in loops
2076
2077 ftree-loop-optimize
2078 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2079 Enable loop optimizations on tree level
2080
2081 ftree-parallelize-loops=
2082 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2083 Enable automatic parallelization of loops
2084
2085 ftree-phiprop
2086 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2087 Enable hoisting loads from conditional pointers.
2088
2089 ftree-pre
2090 Common Report Var(flag_tree_pre) Optimization
2091 Enable SSA-PRE optimization on trees
2092
2093 ftree-partial-pre
2094 Common Report Var(flag_tree_partial_pre) Optimization
2095 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2096
2097 ftree-pta
2098 Common Report Var(flag_tree_pta) Init(1) Optimization
2099 Perform function-local points-to analysis on trees.
2100
2101 ftree-reassoc
2102 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2103 Enable reassociation on tree level
2104
2105 ftree-salias
2106 Common Ignore
2107 Does nothing.  Preserved for backward compatibility.
2108
2109 ftree-sink
2110 Common Report Var(flag_tree_sink) Optimization
2111 Enable SSA code sinking on trees
2112
2113 ftree-slsr
2114 Common Report Var(flag_tree_slsr) Optimization
2115 Perform straight-line strength reduction
2116
2117 ftree-sra
2118 Common Report Var(flag_tree_sra) Optimization
2119 Perform scalar replacement of aggregates
2120
2121 ftree-ter
2122 Common Report Var(flag_tree_ter) Optimization
2123 Replace temporary expressions in the SSA->normal pass
2124
2125 ftree-lrs
2126 Common Report Var(flag_tree_live_range_split) Optimization
2127 Perform live range splitting during the SSA->normal pass
2128
2129 ftree-vrp
2130 Common Report Var(flag_tree_vrp) Init(0) Optimization
2131 Perform Value Range Propagation on trees
2132
2133 funit-at-a-time
2134 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2135 Compile whole compilation unit at a time
2136
2137 funroll-loops
2138 Common Report Var(flag_unroll_loops) Optimization
2139 Perform loop unrolling when iteration count is known
2140
2141 funroll-all-loops
2142 Common Report Var(flag_unroll_all_loops) Optimization
2143 Perform loop unrolling for all loops
2144
2145 ; Nonzero means that loop optimizer may assume that the induction variables
2146 ; that control loops do not overflow and that the loops with nontrivial
2147 ; exit condition are not infinite
2148 funsafe-loop-optimizations
2149 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2150 Allow loop optimizations to assume that the loops behave in normal way
2151
2152 fassociative-math
2153 Common Report Var(flag_associative_math) SetByCombined
2154 Allow optimization for floating-point arithmetic which may change the
2155 result of the operation due to rounding.
2156
2157 freciprocal-math
2158 Common Report Var(flag_reciprocal_math) SetByCombined
2159 Same as -fassociative-math for expressions which include division.
2160
2161 ; Nonzero means that unsafe floating-point math optimizations are allowed
2162 ; for the sake of speed.  IEEE compliance is not guaranteed, and operations
2163 ; are allowed to assume that their arguments and results are "normal"
2164 ; (e.g., nonnegative for SQRT).
2165 funsafe-math-optimizations
2166 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2167 Allow math optimizations that may violate IEEE or ISO standards
2168
2169 funswitch-loops
2170 Common Report Var(flag_unswitch_loops) Optimization
2171 Perform loop unswitching
2172
2173 funwind-tables
2174 Common Report Var(flag_unwind_tables) Optimization
2175 Just generate unwind tables for exception handling
2176
2177 fuse-ld=bfd
2178 Common Negative(fuse-ld=gold)
2179 Use the bfd linker instead of the default linker
2180
2181 fuse-ld=gold
2182 Common Negative(fuse-ld=bfd)
2183 Use the gold linker instead of the default linker
2184
2185 fuse-linker-plugin
2186 Common Undocumented
2187
2188 ; Positive if we should track variables, negative if we should run
2189 ; the var-tracking pass only to discard debug annotations, zero if
2190 ; we're not to run it.  When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2191 ; will be set according to optimize, debug_info_level and debug_hooks
2192 ; in process_options ().
2193 fvar-tracking
2194 Common Report Var(flag_var_tracking) Init(2) Optimization
2195 Perform variable tracking
2196
2197 ; Positive if we should track variables at assignments, negative if
2198 ; we should run the var-tracking pass only to discard debug
2199 ; annotations.  When flag_var_tracking_assignments ==
2200 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2201 fvar-tracking-assignments
2202 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2203 Perform variable tracking by annotating assignments
2204
2205 ; Nonzero if we should toggle flag_var_tracking_assignments after
2206 ; processing options and computing its default.  */
2207 fvar-tracking-assignments-toggle
2208 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2209 Toggle -fvar-tracking-assignments
2210
2211 ; Positive if we should track uninitialized variables, negative if
2212 ; we should run the var-tracking pass only to discard debug
2213 ; annotations.  When flag_var_tracking_uninit == AUTODETECT_VALUE it
2214 ; will be set according to flag_var_tracking.
2215 fvar-tracking-uninit
2216 Common Report Var(flag_var_tracking_uninit) Optimization
2217 Perform variable tracking and also tag variables that are uninitialized
2218
2219 ftree-vectorize
2220 Common Report Var(flag_tree_vectorize) Optimization
2221 Enable loop vectorization on trees
2222
2223 ftree-vectorizer-verbose=
2224 Common RejectNegative Joined UInteger Var(common_deferred_options) Defer
2225 -ftree-vectorizer-verbose=<number>      This switch is deprecated. Use -fopt-info instead.
2226
2227 ftree-slp-vectorize
2228 Common Report Var(flag_tree_slp_vectorize) Init(2) Optimization
2229 Enable basic block vectorization (SLP) on trees
2230
2231 fvect-cost-model
2232 Common Report Var(flag_vect_cost_model) Optimization
2233 Enable use of cost model in vectorization
2234
2235 ftree-vect-loop-version
2236 Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization
2237 Enable loop versioning when doing loop vectorization on trees
2238
2239 ftree-scev-cprop
2240 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2241 Enable copy propagation of scalar-evolution information.
2242
2243 ; -fverbose-asm causes extra commentary information to be produced in
2244 ; the generated assembly code (to make it more readable).  This option
2245 ; is generally only of use to those who actually need to read the
2246 ; generated assembly code (perhaps while debugging the compiler itself).
2247 ; -fno-verbose-asm, the default, causes the extra information
2248 ; to not be added and is useful when comparing two assembler files.
2249 fverbose-asm
2250 Common Report Var(flag_verbose_asm)
2251 Add extra commentary to assembler output
2252
2253 fvisibility=
2254 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2255 -fvisibility=[default|internal|hidden|protected]        Set the default symbol visibility
2256
2257 Enum
2258 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2259
2260 EnumValue
2261 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2262
2263 EnumValue
2264 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2265
2266 EnumValue
2267 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2268
2269 EnumValue
2270 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2271
2272 fvpt
2273 Common Report Var(flag_value_profile_transformations) Optimization
2274 Use expression value profiles in optimizations
2275
2276 fweb
2277 Common Report Var(flag_web) Init(2) Optimization
2278 Construct webs and split unrelated uses of single variable
2279
2280 ftree-builtin-call-dce
2281 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2282 Enable conditional dead code elimination for builtin calls
2283
2284 fwhole-program
2285 Common Report Var(flag_whole_program) Init(0) Optimization
2286 Perform whole program optimizations
2287
2288 fwrapv
2289 Common Report Var(flag_wrapv) Optimization
2290 Assume signed arithmetic overflow wraps around
2291
2292 fzero-initialized-in-bss
2293 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2294 Put zero initialized data in the bss section
2295
2296 g
2297 Common JoinedOrMissing
2298 Generate debug information in default format
2299
2300 gcoff
2301 Common JoinedOrMissing Negative(gdwarf-)
2302 Generate debug information in COFF format
2303
2304 gdwarf-
2305 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2306 Generate debug information in DWARF v2 (or later) format
2307
2308 ggdb
2309 Common JoinedOrMissing
2310 Generate debug information in default extended format
2311
2312 gno-pubnames
2313 Common RejectNegative Var(debug_generate_pub_sections, 0) Init(-1)
2314 Don't generate DWARF pubnames and pubtypes sections.
2315
2316 gpubnames
2317 Common RejectNegative Var(debug_generate_pub_sections, 1)
2318 Generate DWARF pubnames and pubtypes sections.
2319
2320 gno-record-gcc-switches
2321 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2322 Don't record gcc command line switches in DWARF DW_AT_producer.
2323
2324 grecord-gcc-switches
2325 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2326 Record gcc command line switches in DWARF DW_AT_producer.
2327
2328 gno-split-dwarf
2329 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2330 Don't generate debug information in separate .dwo files
2331
2332 gsplit-dwarf
2333 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2334 Generate debug information in separate .dwo files
2335
2336 gstabs
2337 Common JoinedOrMissing Negative(gstabs+)
2338 Generate debug information in STABS format
2339
2340 gstabs+
2341 Common JoinedOrMissing Negative(gvms)
2342 Generate debug information in extended STABS format
2343
2344 gno-strict-dwarf
2345 Common RejectNegative Var(dwarf_strict,0) Init(0)
2346 Emit DWARF additions beyond selected version
2347
2348 gstrict-dwarf
2349 Common Report RejectNegative Var(dwarf_strict,1)
2350 Don't emit DWARF additions beyond selected version
2351
2352 gtoggle
2353 Common Report Var(flag_gtoggle)
2354 Toggle debug information generation
2355
2356 gvms
2357 Common JoinedOrMissing Negative(gxcoff)
2358 Generate debug information in VMS format
2359
2360 gxcoff
2361 Common JoinedOrMissing Negative(gxcoff+)
2362 Generate debug information in XCOFF format
2363
2364 gxcoff+
2365 Common JoinedOrMissing Negative(gcoff)
2366 Generate debug information in extended XCOFF format
2367
2368 h
2369 Driver Joined Separate
2370
2371 iplugindir=
2372 Common Joined Var(plugindir_string) Init(0)
2373 -iplugindir=<dir>       Set <dir> to be the default plugin directory
2374
2375 imultiarch
2376 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2377 -imultiarch <dir>       Set <dir> to be the multiarch include subdirectory
2378
2379 l
2380 Driver Joined Separate
2381
2382 n
2383 Driver
2384
2385 no-canonical-prefixes
2386 Driver
2387
2388 nodefaultlibs
2389 Driver
2390
2391 nostartfiles
2392 Driver
2393
2394 nostdlib
2395 Driver
2396
2397 o
2398 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2399 -o <file>       Place output into <file>
2400
2401 p
2402 Common Var(profile_flag)
2403 Enable function profiling
2404
2405 pass-exit-codes
2406 Driver Var(pass_exit_codes)
2407
2408 pedantic
2409 Common Alias(Wpedantic)
2410
2411 pedantic-errors
2412 Common Var(flag_pedantic_errors)
2413 Like -pedantic but issue them as errors
2414
2415 pg
2416 Driver
2417
2418 pipe
2419 Driver Var(use_pipes)
2420
2421 print-file-name=
2422 Driver JoinedOrMissing Var(print_file_name)
2423
2424 print-libgcc-file-name
2425 Driver
2426
2427 print-multi-directory
2428 Driver Var(print_multi_directory)
2429
2430 print-multi-lib
2431 Driver Var(print_multi_lib)
2432
2433 print-multi-os-directory
2434 Driver Var(print_multi_os_directory)
2435
2436 print-multiarch
2437 Driver Var(print_multiarch)
2438
2439 print-prog-name=
2440 Driver JoinedOrMissing Var(print_prog_name)
2441
2442 print-search-dirs
2443 Driver Var(print_search_dirs)
2444
2445 print-sysroot
2446 Driver Var(print_sysroot)
2447
2448 print-sysroot-headers-suffix
2449 Driver Var(print_sysroot_headers_suffix)
2450
2451 quiet
2452 Common Var(quiet_flag) RejectDriver
2453 Do not display functions compiled or elapsed time
2454
2455 r
2456 Driver
2457
2458 s
2459 Driver
2460
2461 save-temps
2462 Driver
2463
2464 save-temps=
2465 Driver Joined
2466
2467 t
2468 Driver
2469
2470 time
2471 Driver Var(report_times)
2472
2473 time=
2474 Driver JoinedOrMissing
2475
2476 u
2477 Driver Joined Separate
2478
2479 undef
2480 Driver
2481 ; C option, but driver must not handle as "-u ndef".
2482
2483 v
2484 Common Driver Var(verbose_flag)
2485 Enable verbose output
2486
2487 version
2488 Common Var(version_flag) RejectDriver
2489 Display the compiler's version
2490
2491 w
2492 Common Var(inhibit_warnings)
2493 Suppress warnings
2494
2495 wrapper
2496 Driver Separate Var(wrapper_string)
2497
2498 x
2499 Driver Joined Separate
2500
2501 shared
2502 Driver RejectNegative Negative(pie)
2503 Create a shared library
2504
2505 shared-libgcc
2506 Driver
2507
2508 specs
2509 Driver Separate Alias(specs=)
2510
2511 specs=
2512 Driver Joined
2513
2514 static
2515 Driver
2516
2517 static-libgcc
2518 Driver
2519
2520 static-libgfortran
2521 Driver
2522 ; Documented for Fortran, but always accepted by driver.
2523
2524 static-libstdc++
2525 Driver
2526
2527 static-libgo
2528 Driver
2529 ; Documented for Go, but always accepted by driver.
2530
2531 static-libasan
2532 Driver
2533
2534 static-libtsan
2535 Driver
2536
2537 symbolic
2538 Driver
2539
2540 pie
2541 Driver RejectNegative Negative(shared)
2542 Create a position independent executable
2543
2544 z
2545 Driver Joined Separate
2546
2547 ; This comment is to ensure we retain the blank line above.