gcc/common.opt

   1 ; Options for the language- and target-independent parts of the compiler.
   2
   3 ; Copyright (C) 2003-2014 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 ; What the sanitizer should instrument
 211 Variable
 212 unsigned int flag_sanitize
 213
 214 ; Flag whether a prefix has been added to dump_base_name
 215 Variable
 216 bool dump_base_name_prefixed = false
 217
 218 ###
 219 Driver
 220
 221 -assemble
 222 Driver Alias(S)
 223
 224 -compile
 225 Driver Alias(c)
 226
 227 -coverage
 228 Driver Alias(coverage)
 229
 230 -debug
 231 Common Alias(g)
 232
 233 -dump
 234 Common Separate Alias(d)
 235
 236 -dump=
 237 Common Joined Alias(d)
 238
 239 -dumpbase
 240 Common Separate Alias(dumpbase)
 241
 242 -dumpdir
 243 Common Separate Alias(dumpdir)
 244
 245 -entry
 246 Driver Separate Alias(e)
 247
 248 -entry=
 249 Driver Joined Alias(e)
 250
 251 -extra-warnings
 252 Common Warning Alias(Wextra)
 253
 254 -for-assembler
 255 Driver Separate Alias(Xassembler)
 256
 257 -for-assembler=
 258 Driver JoinedOrMissing Alias(Xassembler)
 259
 260 -for-linker
 261 Driver Separate Alias(Xlinker)
 262
 263 -for-linker=
 264 Driver JoinedOrMissing Alias(Xlinker)
 265
 266 -force-link
 267 Driver Separate Alias(u)
 268
 269 -force-link=
 270 Driver Joined Alias(u)
 271
 272 -help
 273 Common Driver Var(help_flag)
 274 Display this information
 275
 276 -help=
 277 Common Driver Report Joined
 278 --help=<class>  Display descriptions of a specific class of options.  <class> is one or more of optimizers, target, warnings, undocumented, params
 279
 280 -language
 281 Driver Separate Alias(x)
 282
 283 -language=
 284 Driver Joined Alias(x)
 285
 286 -library-directory
 287 Driver Separate Alias(L)
 288
 289 -library-directory=
 290 Driver Joined Alias(L)
 291
 292 -no-canonical-prefixes
 293 Driver Alias(no-canonical-prefixes)
 294
 295 -no-standard-libraries
 296 Driver Alias(nostdlib)
 297
 298 -no-sysroot-suffix
 299 Driver Var(no_sysroot_suffix)
 300
 301 -no-warnings
 302 Common Alias(w)
 303
 304 -optimize
 305 Common Alias(O)
 306
 307 -output
 308 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
 309
 310 -output=
 311 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
 312
 313 -pass-exit-codes
 314 Driver Alias(pass-exit-codes)
 315
 316 -pedantic
 317 Common Alias(Wpedantic)
 318
 319 -pedantic-errors
 320 Common Alias(pedantic-errors)
 321
 322 -pie
 323 Driver Alias(pie)
 324
 325 -pipe
 326 Driver Alias(pipe)
 327
 328 -prefix
 329 Driver Separate Alias(B)
 330
 331 -prefix=
 332 Driver JoinedOrMissing Alias(B)
 333
 334 -preprocess
 335 Driver Alias(E)
 336
 337 -print-file-name
 338 Driver Separate Alias(print-file-name=)
 339
 340 -print-file-name=
 341 Driver JoinedOrMissing Alias(print-file-name=)
 342
 343 -print-libgcc-file-name
 344 Driver Alias(print-libgcc-file-name)
 345
 346 -print-multi-directory
 347 Driver Alias(print-multi-directory)
 348
 349 -print-multi-lib
 350 Driver Alias(print-multi-lib)
 351
 352 -print-multi-os-directory
 353 Driver Alias(print-multi-os-directory)
 354
 355 -print-multiarch
 356 Driver Alias(print-multiarch)
 357
 358 -print-prog-name
 359 Driver Separate Alias(print-prog-name=)
 360
 361 -print-prog-name=
 362 Driver JoinedOrMissing Alias(print-prog-name=)
 363
 364 -print-search-dirs
 365 Driver Alias(print-search-dirs)
 366
 367 -print-sysroot
 368 Driver Alias(print-sysroot)
 369
 370 -print-sysroot-headers-suffix
 371 Driver Alias(print-sysroot-headers-suffix)
 372
 373 -profile
 374 Common Alias(p)
 375
 376 -save-temps
 377 Driver Alias(save-temps)
 378
 379 -shared
 380 Driver Alias(shared)
 381
 382 -specs
 383 Driver Separate Alias(specs=)
 384
 385 -specs=
 386 Driver Joined Alias(specs=)
 387
 388 -static
 389 Driver Alias(static)
 390
 391 -symbolic
 392 Driver Alias(symbolic)
 393
 394 -target-help
 395 Common Driver
 396 Alias for --help=target
 397
 398 -time
 399 Driver Alias(time)
 400
 401 -verbose
 402 Driver Alias(v)
 403
 404 ;; The driver used to convert options such as --help into forms such
 405 ;; as -fhelp; the following four entries are for compatibility with
 406 ;; any direct uses of those (undocumented) -f forms
 407 fhelp
 408 Common Driver Alias(-help)
 409
 410 fhelp=
 411 Common Driver Joined Alias(-help=)
 412
 413 ftarget-help
 414 Common Driver Alias(-target-help)
 415
 416 fversion
 417 Common Driver Alias(-version)
 418
 419 -param
 420 Common Separate
 421 --param <param>=<value> Set parameter <param> to value.  See below for a complete list of parameters
 422
 423 -param=
 424 Common Joined Alias(-param)
 425
 426 -sysroot
 427 Driver Separate Alias(-sysroot=)
 428
 429 -sysroot=
 430 Driver JoinedOrMissing
 431
 432 -version
 433 Common Driver
 434
 435 B
 436 Driver Joined Separate
 437
 438 E
 439 Driver
 440
 441 L
 442 Driver Joined Separate
 443
 444 N
 445 Driver
 446
 447 O
 448 Common JoinedOrMissing Optimization
 449 -O<number>      Set optimization level to <number>
 450
 451 Os
 452 Common Optimization
 453 Optimize for space rather than speed
 454
 455 Ofast
 456 Common Optimization
 457 Optimize for speed disregarding exact standards compliance
 458
 459 Og
 460 Common Optimization
 461 Optimize for debugging experience rather than speed or size
 462
 463 Q
 464 Driver
 465
 466 Qn
 467 Driver Negative(Qy)
 468
 469 Qy
 470 Driver Negative(Qn)
 471
 472 R
 473 Driver Joined Separate
 474
 475 S
 476 Driver
 477
 478 T
 479 Driver Joined Separate
 480
 481 Tbss
 482 Driver Separate
 483
 484 Tbss=
 485 Driver Joined
 486
 487 Tdata
 488 Driver Separate
 489
 490 Tdata=
 491 Driver Joined
 492
 493 Ttext
 494 Driver Separate
 495
 496 Ttext=
 497 Driver Joined
 498
 499 W
 500 Common RejectNegative Warning Alias(Wextra)
 501 This switch is deprecated; use -Wextra instead
 502
 503 Wa,
 504 Driver JoinedOrMissing
 505
 506 Wl,
 507 Driver JoinedOrMissing
 508
 509 Wp,
 510 Driver JoinedOrMissing
 511
 512 Waggregate-return
 513 Common Var(warn_aggregate_return) Warning
 514 Warn about returning structures, unions or arrays
 515
 516 Waggressive-loop-optimizations
 517 Common Var(warn_aggressive_loop_optimizations) Init(1) Warning
 518 Warn if a loop with constant number of iterations triggers undefined behavior
 519
 520 Warray-bounds
 521 Common Var(warn_array_bounds) Warning
 522 Warn if an array is accessed out of bounds
 523
 524 Wattributes
 525 Common Var(warn_attributes) Init(1) Warning
 526 Warn about inappropriate attribute usage
 527
 528 Wcast-align
 529 Common Var(warn_cast_align) Warning
 530 Warn about pointer casts which increase alignment
 531
 532 Wcpp
 533 Common Var(warn_cpp) Init(1) Warning
 534 Warn when a #warning directive is encountered
 535
 536 Wdeprecated-declarations
 537 Common Var(warn_deprecated_decl) Init(1) Warning
 538 Warn about uses of __attribute__((deprecated)) declarations
 539
 540 Wdisabled-optimization
 541 Common Var(warn_disabled_optimization) Warning
 542 Warn when an optimization pass is disabled
 543
 544 Werror
 545 Common Var(warnings_are_errors)
 546 Treat all warnings as errors
 547
 548 Werror=
 549 Common Joined
 550 Treat specified warning as error
 551
 552 Wextra
 553 Common Var(extra_warnings) Warning
 554 Print extra (possibly unwanted) warnings
 555
 556 Wfatal-errors
 557 Common Var(flag_fatal_errors)
 558 Exit on the first error occurred
 559
 560 Wframe-larger-than=
 561 Common RejectNegative Joined UInteger
 562 -Wframe-larger-than=<number>    Warn if a function's stack frame requires more than <number> bytes
 563
 564 Wfree-nonheap-object
 565 Common Var(warn_free_nonheap_object) Init(1) Warning
 566 Warn when attempting to free a non-heap object
 567
 568 Winline
 569 Common Var(warn_inline) Warning
 570 Warn when an inlined function cannot be inlined
 571
 572 Winvalid-memory-model
 573 Common Var(warn_invalid_memory_model) Init(1) Warning
 574 Warn when an atomic memory model parameter is known to be outside the valid range.
 575
 576 Wlarger-than-
 577 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
 578
 579 Wlarger-than=
 580 Common RejectNegative Joined UInteger Warning
 581 -Wlarger-than=<number>  Warn if an object is larger than <number> bytes
 582
 583 Wunsafe-loop-optimizations
 584 Common Var(warn_unsafe_loop_optimizations) Warning
 585 Warn if the loop cannot be optimized due to nontrivial assumptions.
 586
 587 Wmissing-noreturn
 588 Common Alias(Wsuggest-attribute=noreturn)
 589
 590 Wodr
 591 Common Var(warn_odr_violations) Init(1) Warning
 592 Warn about some C++ One Definition Rule violations during link time optimization
 593
 594 Woverflow
 595 Common Var(warn_overflow) Init(1) Warning
 596 Warn about overflow in arithmetic expressions
 597
 598 Wpacked
 599 Common Var(warn_packed) Warning
 600 Warn when the packed attribute has no effect on struct layout
 601
 602 Wpadded
 603 Common Var(warn_padded) Warning
 604 Warn when padding is required to align structure members
 605
 606 Wpedantic
 607 Common Var(pedantic) Init(0) Warning
 608 Issue warnings needed for strict compliance to the standard
 609
 610 Wreturn-local-addr
 611 Common Var(warn_return_local_addr) Init(1) Warning
 612 Warn about returning a pointer/reference to a local or temporary variable.
 613
 614 Wshadow
 615 Common Var(warn_shadow) Warning
 616 Warn when one local variable shadows another
 617
 618 Wstack-protector
 619 Common Var(warn_stack_protect) Warning
 620 Warn when not issuing stack smashing protection for some reason
 621
 622 Wstack-usage=
 623 Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
 624 Warn if stack usage might be larger than specified amount
 625
 626 Wstrict-aliasing
 627 Common Warning
 628 Warn about code which might break strict aliasing rules
 629
 630 Wstrict-aliasing=
 631 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
 632 Warn about code which might break strict aliasing rules
 633
 634 Wstrict-overflow
 635 Common Warning
 636 Warn about optimizations that assume that signed overflow is undefined
 637
 638 Wstrict-overflow=
 639 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
 640 Warn about optimizations that assume that signed overflow is undefined
 641
 642 Wsuggest-attribute=const
 643 Common Var(warn_suggest_attribute_const) Warning
 644 Warn about functions which might be candidates for __attribute__((const))
 645
 646 Wsuggest-attribute=pure
 647 Common Var(warn_suggest_attribute_pure) Warning
 648 Warn about functions which might be candidates for __attribute__((pure))
 649
 650 Wsuggest-attribute=noreturn
 651 Common Var(warn_suggest_attribute_noreturn) Warning
 652 Warn about functions which might be candidates for __attribute__((noreturn))
 653
 654 Wsuggest-final-types
 655 Common Var(warn_suggest_final_types) Warning
 656 Warn about C++ polymorphic types where adding final keyword would improve code quality
 657
 658 Wsuggest-final-methods
 659 Common Var(warn_suggest_final_methods) Warning
 660 Warn about C++ virtual methods where adding final keyword would improve code quality
 661
 662 Wsystem-headers
 663 Common Var(warn_system_headers) Warning
 664 Do not suppress warnings from system headers
 665
 666 Wtrampolines
 667 Common Var(warn_trampolines) Warning
 668 Warn whenever a trampoline is generated
 669
 670 Wtype-limits
 671 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
 672 Warn if a comparison is always true or always false due to the limited range of the data type
 673
 674 Wuninitialized
 675 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
 676 Warn about uninitialized automatic variables
 677
 678 Wmaybe-uninitialized
 679 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
 680 Warn about maybe uninitialized automatic variables
 681
 682 Wunreachable-code
 683 Common Ignore
 684 Does nothing. Preserved for backward compatibility.
 685
 686 Wunused
 687 Common Var(warn_unused) Init(0) Warning
 688 Enable all -Wunused- warnings
 689
 690 Wunused-but-set-parameter
 691 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
 692 Warn when a function parameter is only set, otherwise unused
 693
 694 Wunused-but-set-variable
 695 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
 696 Warn when a variable is only set, otherwise unused
 697
 698 Wunused-function
 699 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
 700 Warn when a function is unused
 701
 702 Wunused-label
 703 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
 704 Warn when a label is unused
 705
 706 Wunused-parameter
 707 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
 708 Warn when a function parameter is unused
 709
 710 Wunused-value
 711 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
 712 Warn when an expression value is unused
 713
 714 Wunused-variable
 715 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
 716 Warn when a variable is unused
 717
 718 Wcoverage-mismatch
 719 Common Var(warn_coverage_mismatch) Init(1) Warning
 720 Warn in case profiles in -fprofile-use do not match
 721
 722 Wvector-operation-performance
 723 Common Var(warn_vector_operation_performance) Warning
 724 Warn when a vector operation is compiled outside the SIMD
 725
 726 Xassembler
 727 Driver Separate
 728
 729 Xlinker
 730 Driver Separate
 731
 732 Xpreprocessor
 733 Driver Separate
 734
 735 Z
 736 Driver
 737
 738 aux-info
 739 Common Separate Var(aux_info_file_name)
 740 -aux-info <file>        Emit declaration information into <file>
 741
 742 aux-info=
 743 Common Joined Alias(aux-info)
 744
 745 auxbase
 746 Common Separate RejectDriver Var(aux_base_name)
 747
 748 auxbase-strip
 749 Common Separate RejectDriver
 750
 751 coverage
 752 Driver
 753
 754 c
 755 Driver
 756
 757 d
 758 Common Joined
 759 -d<letters>     Enable dumps from specific passes of the compiler
 760
 761 dumpbase
 762 Common Separate Var(dump_base_name)
 763 -dumpbase <file>        Set the file basename to be used for dumps
 764
 765 dumpdir
 766 Common Separate Var(dump_dir_name)
 767 -dumpdir <dir>  Set the directory name to be used for dumps
 768
 769 dumpmachine
 770 Driver
 771
 772 dumpspecs
 773 Driver
 774
 775 dumpversion
 776 Driver
 777
 778 e
 779 Driver Joined Separate
 780
 781 ; This option has historically been passed down to the linker by an
 782 ; accident of a %{e*} spec, so ensure it continues to be passed down
 783 ; as a single option.  The supported option for this purpose is
 784 ; -rdynamic.  See PR 47390.
 785 export-dynamic
 786 Driver Undocumented
 787
 788 ; The version of the C++ ABI in use.  The following values are allowed:
 789 ;
 790 ; 0: The version of the ABI believed most conformant with the C++ ABI
 791 ;    specification.  This ABI may change as bugs are discovered and fixed.
 792 ;    Therefore, 0 will not necessarily indicate the same ABI in different
 793 ;    versions of G++.
 794 ;
 795 ; 1: The version of the ABI first used in G++ 3.2.  No longer selectable.
 796 ;
 797 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
 798 ;
 799 ; 3: The version of the ABI that fixes the missing underscore
 800 ;    in template non-type arguments of pointer type.
 801 ;
 802 ; 4: The version of the ABI that introduces unambiguous mangling of
 803 ;    vector types.  First selectable in G++ 4.5.
 804 ;
 805 ; 5: The version of the ABI that ignores attribute const/noreturn
 806 ;    in function pointer mangling, and corrects mangling of decltype and
 807 ;    function parameters used in other parameters and the return type.
 808 ;    First selectable in G++ 4.6.
 809 ;
 810 ; 6: The version of the ABI that doesn't promote scoped enums to int and
 811 ;    changes the mangling of template argument packs, const/static_cast,
 812 ;    prefix ++ and --, and a class scope function used as a template
 813 ;    argument.
 814 ;    First selectable in G++ 4.7.
 815 ;
 816 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
 817 ;    corrects the mangling of lambdas in default argument scope.
 818 ;    First selectable in G++ 4.8.
 819 ;
 820 ; 8: The version of the ABI that corrects the substitution behavior of
 821 ;    function types with function-cv-qualifiers.
 822 ;    First selectable in G++ 4.9.
 823 ;
 824 ; Additional positive integers will be assigned as new versions of
 825 ; the ABI become the default version of the ABI.
 826 fabi-version=
 827 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(0)
 828 The version of the C++ ABI in use
 829
 830 faggressive-loop-optimizations
 831 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
 832 Aggressively optimize loops using language constraints
 833
 834 falign-functions
 835 Common Report Var(align_functions,0) Optimization UInteger
 836 Align the start of functions
 837
 838 falign-functions=
 839 Common RejectNegative Joined UInteger Var(align_functions)
 840
 841 falign-jumps
 842 Common Report Var(align_jumps,0) Optimization UInteger
 843 Align labels which are only reached by jumping
 844
 845 falign-jumps=
 846 Common RejectNegative Joined UInteger Var(align_jumps)
 847
 848 falign-labels
 849 Common Report Var(align_labels,0) Optimization UInteger
 850 Align all labels
 851
 852 falign-labels=
 853 Common RejectNegative Joined UInteger Var(align_labels)
 854
 855 falign-loops
 856 Common Report Var(align_loops,0) Optimization UInteger
 857 Align the start of loops
 858
 859 falign-loops=
 860 Common RejectNegative Joined UInteger Var(align_loops)
 861
 862 fargument-alias
 863 Common Ignore
 864 Does nothing. Preserved for backward compatibility.
 865
 866 fargument-noalias
 867 Common Ignore
 868 Does nothing. Preserved for backward compatibility.
 869
 870 fargument-noalias-global
 871 Common Ignore
 872 Does nothing. Preserved for backward compatibility.
 873
 874 fargument-noalias-anything
 875 Common Ignore
 876 Does nothing. Preserved for backward compatibility.
 877
 878 fsanitize=
 879 Common Driver Report Joined
 880 Select what to sanitize
 881
 882 fsanitize-recover
 883 Common Report Var(flag_sanitize_recover) Init(1)
 884 After diagnosing undefined behavior attempt to continue execution
 885
 886 fsanitize-undefined-trap-on-error
 887 Common Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
 888 Use trap instead of a library function for undefined behavior sanitization
 889
 890 fasynchronous-unwind-tables
 891 Common Report Var(flag_asynchronous_unwind_tables) Optimization
 892 Generate unwind tables that are exact at each instruction boundary
 893
 894 fauto-inc-dec
 895 Common Report Var(flag_auto_inc_dec) Init(1)
 896 Generate auto-inc/dec instructions
 897
 898 fauto-profile
 899 Common Report Var(flag_auto_profile) Optimization
 900 Use sample profile information for call graph node weights. The default
 901 profile file is fbdata.afdo in 'pwd'.
 902
 903 fauto-profile=
 904 Common Joined RejectNegative Var(auto_profile_file)
 905 Use sample profile information for call graph node weights. The profile
 906 file is specified in the argument.
 907
 908 ; -fcheck-bounds causes gcc to generate array bounds checks.
 909 ; For C, C++ and ObjC: defaults off.
 910 ; For Java: defaults to on.
 911 ; For Fortran: defaults to off.
 912 fbounds-check
 913 Common Report Var(flag_bounds_check)
 914 Generate code to check bounds before indexing arrays
 915
 916 fbranch-count-reg
 917 Common Report Var(flag_branch_on_count_reg) Optimization
 918 Replace add, compare, branch with branch on count register
 919
 920 fbranch-probabilities
 921 Common Report Var(flag_branch_probabilities) Optimization
 922 Use profiling information for branch probabilities
 923
 924 fbranch-target-load-optimize
 925 Common Report Var(flag_branch_target_load_optimize) Optimization
 926 Perform branch target load optimization before prologue / epilogue threading
 927
 928 fbranch-target-load-optimize2
 929 Common Report Var(flag_branch_target_load_optimize2) Optimization
 930 Perform branch target load optimization after prologue / epilogue threading
 931
 932 fbtr-bb-exclusive
 933 Common Report Var(flag_btr_bb_exclusive) Optimization
 934 Restrict target load migration not to re-use registers in any basic block
 935
 936 fcall-saved-
 937 Common Joined RejectNegative Var(common_deferred_options) Defer
 938 -fcall-saved-<register> Mark <register> as being preserved across functions
 939
 940 fcall-used-
 941 Common Joined RejectNegative Var(common_deferred_options) Defer
 942 -fcall-used-<register>  Mark <register> as being corrupted by function calls
 943
 944 ; Nonzero for -fcaller-saves: allocate values in regs that need to
 945 ; be saved across function calls, if that produces overall better code.
 946 ; Optional now, so people can test it.
 947 fcaller-saves
 948 Common Report Var(flag_caller_saves) Optimization
 949 Save registers around function calls
 950
 951 fcheck-data-deps
 952 Common Report Var(flag_check_data_deps)
 953 Compare the results of several data dependence analyzers.
 954
 955 fcheck-new
 956 Common Var(flag_check_new)
 957 Check the return value of new in C++
 958
 959 fcombine-stack-adjustments
 960 Common Report Var(flag_combine_stack_adjustments) Optimization
 961 Looks for opportunities to reduce stack adjustments and stack references.
 962
 963 fcommon
 964 Common Report Var(flag_no_common,0) Optimization
 965 Do not put uninitialized globals in the common section
 966
 967 fcompare-debug
 968 Driver
 969 ; Converted by the driver to -fcompare-debug= options.
 970
 971 fcompare-debug=
 972 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
 973 -fcompare-debug[=<opts>]        Compile with and without e.g. -gtoggle, and compare the final-insns dump
 974
 975 fcompare-debug-second
 976 Common Driver RejectNegative Var(flag_compare_debug)
 977 Run only the second compilation of -fcompare-debug
 978
 979 fcompare-elim
 980 Common Report Var(flag_compare_elim_after_reload) Optimization
 981 Perform comparison elimination after register allocation has finished
 982
 983 fconserve-stack
 984 Common Var(flag_conserve_stack) Optimization
 985 Do not perform optimizations increasing noticeably stack usage
 986
 987 fcprop-registers
 988 Common Report Var(flag_cprop_registers) Optimization
 989 Perform a register copy-propagation optimization pass
 990
 991 fcrossjumping
 992 Common Report Var(flag_crossjumping) Optimization
 993 Perform cross-jumping optimization
 994
 995 fcse-follow-jumps
 996 Common Report Var(flag_cse_follow_jumps) Optimization
 997 When running CSE, follow jumps to their targets
 998
 999 fcse-skip-blocks
1000 Common Ignore
1001 Does nothing.  Preserved for backward compatibility.
1002
1003 fcx-limited-range
1004 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
1005 Omit range reduction step when performing complex division
1006
1007 fcx-fortran-rules
1008 Common Report Var(flag_cx_fortran_rules) Optimization
1009 Complex multiplication and division follow Fortran rules
1010
1011 fdata-sections
1012 Common Report Var(flag_data_sections) Optimization
1013 Place data items into their own section
1014
1015 fdbg-cnt-list
1016 Common Report Var(common_deferred_options) Defer
1017 List all available debugging counters with their limits and counts.
1018
1019 fdbg-cnt=
1020 Common RejectNegative Joined Var(common_deferred_options) Defer
1021 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...]     Set the debug counter limit.
1022
1023 fdebug-prefix-map=
1024 Common Joined RejectNegative Var(common_deferred_options) Defer
1025 Map one directory name to another in debug information
1026
1027 fdebug-types-section
1028 Common Report Var(flag_debug_types_section) Init(0)
1029 Output .debug_types section when using DWARF v4 debuginfo.
1030
1031 ; Nonzero for -fdefer-pop: don't pop args after each function call
1032 ; instead save them up to pop many calls' args with one insns.
1033 fdefer-pop
1034 Common Report Var(flag_defer_pop) Optimization
1035 Defer popping functions args from stack until later
1036
1037 fdelayed-branch
1038 Common Report Var(flag_delayed_branch) Optimization
1039 Attempt to fill delay slots of branch instructions
1040
1041 fdelete-dead-exceptions
1042 Common Report Var(flag_delete_dead_exceptions) Init(0)
1043 Delete dead instructions that may throw exceptions
1044
1045 fdelete-null-pointer-checks
1046 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
1047 Delete useless null pointer checks
1048
1049 fdevirtualize-speculatively
1050 Common Report Var(flag_devirtualize_speculatively) Optimization
1051 Perform speculative devirtualization
1052
1053 fdevirtualize
1054 Common Report Var(flag_devirtualize) Optimization
1055 Try to convert virtual calls to direct ones.
1056
1057 fdiagnostics-show-location=
1058 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1059 -fdiagnostics-show-location=[once|every-line]   How often to emit source location at the beginning of line-wrapped diagnostics
1060
1061 ; Required for these enum values.
1062 SourceInclude
1063 pretty-print.h
1064
1065 Enum
1066 Name(diagnostic_prefixing_rule) Type(int)
1067
1068 EnumValue
1069 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1070
1071 EnumValue
1072 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1073
1074 fdiagnostics-show-caret
1075 Common Var(flag_diagnostics_show_caret) Init(1)
1076 Show the source line with a caret indicating the column
1077
1078 fdiagnostics-color
1079 Common Alias(fdiagnostics-color=,always,never)
1080 ;
1081
1082 fdiagnostics-color=
1083 Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1084 -fdiagnostics-color=[never|always|auto] Colorize diagnostics
1085
1086 ; Required for these enum values.
1087 SourceInclude
1088 diagnostic-color.h
1089
1090 Enum
1091 Name(diagnostic_color_rule) Type(int)
1092
1093 EnumValue
1094 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1095
1096 EnumValue
1097 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1098
1099 EnumValue
1100 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1101
1102 fdiagnostics-show-option
1103 Common Var(flag_diagnostics_show_option) Init(1)
1104 Amend appropriate diagnostic messages with the command line option that controls them
1105
1106 fdisable-
1107 Common Joined RejectNegative Var(common_deferred_options) Defer
1108 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1109
1110 fenable-
1111 Common Joined RejectNegative Var(common_deferred_options) Defer
1112 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1113
1114 fdump-
1115 Common Joined RejectNegative Var(common_deferred_options) Defer
1116 -fdump-<type>   Dump various compiler internals to a file
1117
1118 fdump-final-insns
1119 Driver RejectNegative
1120
1121 fdump-final-insns=
1122 Common RejectNegative Joined Var(flag_dump_final_insns)
1123 -fdump-final-insns=filename     Dump to filename the insns at the end of translation
1124
1125 fdump-go-spec=
1126 Common RejectNegative Joined Var(flag_dump_go_spec)
1127 -fdump-go-spec=filename Write all declarations to file as Go code
1128
1129 fdump-noaddr
1130 Common Report Var(flag_dump_noaddr)
1131 Suppress output of addresses in debugging dumps
1132
1133 freport-bug
1134 Common Driver Var(flag_report_bug)
1135 Collect and dump debug information into temporary file if ICE in C/C++
1136 compiler occured.
1137
1138 fdump-passes
1139 Common Var(flag_dump_passes) Init(0)
1140 Dump optimization passes
1141
1142 fdump-unnumbered
1143 Common Report Var(flag_dump_unnumbered)
1144 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1145
1146 fdump-unnumbered-links
1147 Common Report Var(flag_dump_unnumbered_links)
1148 Suppress output of previous and next insn numbers in debugging dumps
1149
1150 fdwarf2-cfi-asm
1151 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1152 Enable CFI tables via GAS assembler directives.
1153
1154 fearly-inlining
1155 Common Report Var(flag_early_inlining) Init(1) Optimization
1156 Perform early inlining
1157
1158 feliminate-dwarf2-dups
1159 Common Report Var(flag_eliminate_dwarf2_dups)
1160 Perform DWARF2 duplicate elimination
1161
1162 fipa-sra
1163 Common Report Var(flag_ipa_sra) Init(0) Optimization
1164 Perform interprocedural reduction of aggregates
1165
1166 feliminate-unused-debug-symbols
1167 Common Report Var(flag_debug_only_used_symbols)
1168 Perform unused type elimination in debug info
1169
1170 feliminate-unused-debug-types
1171 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1172 Perform unused type elimination in debug info
1173
1174 femit-class-debug-always
1175 Common Report Var(flag_emit_class_debug_always) Init(0)
1176 Do not suppress C++ class debug information.
1177
1178 fexceptions
1179 Common Report Var(flag_exceptions) Optimization
1180 Enable exception handling
1181
1182 fexpensive-optimizations
1183 Common Report Var(flag_expensive_optimizations) Optimization
1184 Perform a number of minor, expensive optimizations
1185
1186 fexcess-precision=
1187 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1188 -fexcess-precision=[fast|standard]      Specify handling of excess floating-point precision
1189
1190 Enum
1191 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1192
1193 EnumValue
1194 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1195
1196 EnumValue
1197 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1198
1199 ffast-math
1200 Common
1201
1202 ffat-lto-objects
1203 Common Var(flag_fat_lto_objects)
1204 Output lto objects containing both the intermediate language and binary output.
1205
1206 ffinite-math-only
1207 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1208 Assume no NaNs or infinities are generated
1209
1210 ffixed-
1211 Common Joined RejectNegative Var(common_deferred_options) Defer
1212 -ffixed-<register>      Mark <register> as being unavailable to the compiler
1213
1214 ffloat-store
1215 Common Report Var(flag_float_store) Optimization
1216 Don't allocate floats and doubles in extended-precision registers
1217
1218 fforce-addr
1219 Common Ignore
1220 Does nothing.  Preserved for backward compatibility.
1221
1222 fforward-propagate
1223 Common Report Var(flag_forward_propagate) Optimization
1224 Perform a forward propagation pass on RTL
1225
1226 ffp-contract=
1227 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1228 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1229
1230 Enum
1231 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1232
1233 EnumValue
1234 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1235
1236 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1237 EnumValue
1238 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1239
1240 EnumValue
1241 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1242
1243 ; Nonzero means don't put addresses of constant functions in registers.
1244 ; Used for compiling the Unix kernel, where strange substitutions are
1245 ; done on the assembly output.
1246 ffunction-cse
1247 Common Report Var(flag_no_function_cse,0)
1248 Allow function addresses to be held in registers
1249
1250 ffunction-sections
1251 Common Report Var(flag_function_sections)
1252 Place each function into its own section
1253
1254 fgcse
1255 Common Report Var(flag_gcse) Optimization
1256 Perform global common subexpression elimination
1257
1258 fgcse-lm
1259 Common Report Var(flag_gcse_lm) Init(1) Optimization
1260 Perform enhanced load motion during global common subexpression elimination
1261
1262 fgcse-sm
1263 Common Report Var(flag_gcse_sm) Init(0) Optimization
1264 Perform store motion after global common subexpression elimination
1265
1266 fgcse-las
1267 Common Report Var(flag_gcse_las) Init(0) Optimization
1268 Perform redundant load after store elimination in global common subexpression
1269 elimination
1270
1271 fgcse-after-reload
1272 Common Report Var(flag_gcse_after_reload) Optimization
1273 Perform global common subexpression elimination after register allocation
1274 has finished
1275
1276 ; This option is not documented yet as its semantics will change.
1277 fgraphite
1278 Common Report Var(flag_graphite)
1279 Enable in and out of Graphite representation
1280
1281 fgraphite-identity
1282 Common Report Var(flag_graphite_identity) Optimization
1283 Enable Graphite Identity transformation
1284
1285 fgraphite-code-generator=
1286 Common Report RejectNegative Joined Optimization Enum(fgraphite_generator) Var(flag_graphite_code_gen) Init(FGRAPHITE_CODE_GEN_ISL)
1287 Choose code generator of Graphite
1288
1289 Enum
1290 Name(fgraphite_generator) Type(enum fgraphite_generator) UnknownError(unknown code generator of graphite %qs)
1291
1292 EnumValue
1293 Enum(fgraphite_generator) String(isl) Value(FGRAPHITE_CODE_GEN_ISL)
1294
1295 EnumValue
1296 Enum(fgraphite_generator) String(cloog) Value(FGRAPHITE_CODE_GEN_CLOOG)
1297
1298 fhoist-adjacent-loads
1299 Common Report Var(flag_hoist_adjacent_loads) Optimization
1300 Enable hoisting adjacent loads to encourage generating conditional move
1301 instructions
1302
1303 floop-parallelize-all
1304 Common Report Var(flag_loop_parallelize_all) Optimization
1305 Mark all loops as parallel
1306
1307 floop-strip-mine
1308 Common Report Var(flag_loop_strip_mine) Optimization
1309 Enable Loop Strip Mining transformation
1310
1311 floop-interchange
1312 Common Report Var(flag_loop_interchange) Optimization
1313 Enable Loop Interchange transformation
1314
1315 floop-block
1316 Common Report Var(flag_loop_block) Optimization
1317 Enable Loop Blocking transformation
1318
1319 fgnu-tm
1320 Common Report Var(flag_tm)
1321 Enable support for GNU transactional memory
1322
1323 fgnu-unique
1324 Common Report Var(flag_gnu_unique) Init(1)
1325 Use STB_GNU_UNIQUE if supported by the assembler
1326
1327 floop-flatten
1328 Common Ignore
1329 Does nothing. Preserved for backward compatibility.
1330
1331 floop-nest-optimize
1332 Common Report Var(flag_loop_optimize_isl) Optimization
1333 Enable the ISL based loop nest optimizer
1334
1335 fstrict-volatile-bitfields
1336 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1337 Force bitfield accesses to match their type width
1338
1339 fguess-branch-probability
1340 Common Report Var(flag_guess_branch_prob) Optimization
1341 Enable guessing of branch probabilities
1342
1343 ; Nonzero means ignore `#ident' directives.  0 means handle them.
1344 ; Generate position-independent code for executables if possible
1345 ; On SVR4 targets, it also controls whether or not to emit a
1346 ; string identifying the compiler.
1347 fident
1348 Common Report Var(flag_no_ident,0)
1349 Process #ident directives
1350
1351 fif-conversion
1352 Common Report Var(flag_if_conversion) Optimization
1353 Perform conversion of conditional jumps to branchless equivalents
1354
1355 fif-conversion2
1356 Common Report Var(flag_if_conversion2) Optimization
1357 Perform conversion of conditional jumps to conditional execution
1358
1359 fstack-reuse=
1360 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1361 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1362
1363 Enum
1364 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1365
1366 EnumValue
1367 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1368
1369 EnumValue
1370 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1371
1372 EnumValue
1373 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1374
1375 ftree-loop-if-convert
1376 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1377 Convert conditional jumps in innermost loops to branchless equivalents
1378
1379 ftree-loop-if-convert-stores
1380 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1381 Also if-convert conditional jumps containing memory writes
1382
1383 ; -finhibit-size-directive inhibits output of .size for ELF.
1384 ; This is used only for compiling crtstuff.c,
1385 ; and it may be extended to other effects
1386 ; needed for crtstuff.c on other systems.
1387 finhibit-size-directive
1388 Common Report Var(flag_inhibit_size_directive)
1389 Do not generate .size directives
1390
1391 findirect-inlining
1392 Common Report Var(flag_indirect_inlining)
1393 Perform indirect inlining
1394
1395 ; General flag to enable inlining.  Specifying -fno-inline will disable
1396 ; all inlining apart from always-inline functions.
1397 finline
1398 Common Report Var(flag_no_inline,0) Init(0) Optimization
1399 Enable inlining of function declared \"inline\", disabling disables all inlining
1400
1401 finline-small-functions
1402 Common Report Var(flag_inline_small_functions) Optimization
1403 Integrate functions into their callers when code size is known not to grow
1404
1405 finline-functions
1406 Common Report Var(flag_inline_functions) Optimization
1407 Integrate functions not declared \"inline\" into their callers when profitable
1408
1409 finline-functions-called-once
1410 Common Report Var(flag_inline_functions_called_once) Optimization
1411 Integrate functions only required by their single caller
1412
1413 finline-limit-
1414 Common RejectNegative Joined Alias(finline-limit=)
1415
1416 finline-limit=
1417 Common RejectNegative Joined UInteger
1418 -finline-limit=<number> Limit the size of inlined functions to <number>
1419
1420 finline-atomics
1421 Common Report Var(flag_inline_atomics) Init(1) Optimization
1422 Inline __atomic operations when a lock free instruction sequence is available.
1423
1424 finstrument-functions
1425 Common Report Var(flag_instrument_function_entry_exit)
1426 Instrument function entry and exit with profiling calls
1427
1428 finstrument-functions-exclude-function-list=
1429 Common RejectNegative Joined
1430 -finstrument-functions-exclude-function-list=name,...  Do not instrument listed functions
1431
1432 finstrument-functions-exclude-file-list=
1433 Common RejectNegative Joined
1434 -finstrument-functions-exclude-file-list=filename,...  Do not instrument functions listed in files
1435
1436 fipa-cp
1437 Common Report Var(flag_ipa_cp) Optimization
1438 Perform interprocedural constant propagation
1439
1440 fipa-cp-clone
1441 Common Report Var(flag_ipa_cp_clone) Optimization
1442 Perform cloning to make Interprocedural constant propagation stronger
1443
1444 fipa-profile
1445 Common Report Var(flag_ipa_profile) Init(0) Optimization
1446 Perform interprocedural profile propagation
1447
1448 fipa-pta
1449 Common Report Var(flag_ipa_pta) Init(0) Optimization
1450 Perform interprocedural points-to analysis
1451
1452 fipa-pure-const
1453 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1454 Discover pure and const functions
1455
1456 fipa-icf
1457 Common Report Var(flag_ipa_icf) Optimization
1458 Perform Identical Code Folding for functions and read-only variables
1459
1460 fipa-icf-functions
1461 Common Report Var(flag_ipa_icf_functions) Optimization
1462 Perform Identical Code Folding for functions
1463
1464 fipa-icf-variables
1465 Common Report Var(flag_ipa_icf_variables) Optimization
1466 Perform Identical Code Folding for variables
1467
1468 fipa-reference
1469 Common Report Var(flag_ipa_reference) Init(0) Optimization
1470 Discover readonly and non addressable static variables
1471
1472 fipa-matrix-reorg
1473 Common Ignore
1474 Does nothing. Preserved for backward compatibility.
1475
1476 fipa-struct-reorg
1477 Common Ignore
1478 Does nothing. Preserved for backward compatibility.
1479
1480 fira-algorithm=
1481 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1482 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1483
1484 Enum
1485 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1486
1487 EnumValue
1488 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1489
1490 EnumValue
1491 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1492
1493 fira-region=
1494 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1495 -fira-region=[one|all|mixed] Set regions for IRA
1496
1497 Enum
1498 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1499
1500 EnumValue
1501 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1502
1503 EnumValue
1504 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1505
1506 EnumValue
1507 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1508
1509 fira-hoist-pressure
1510 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1511 Use IRA based register pressure calculation
1512 in RTL hoist optimizations.
1513
1514 fira-loop-pressure
1515 Common Report Var(flag_ira_loop_pressure) Optimization
1516 Use IRA based register pressure calculation
1517 in RTL loop optimizations.
1518
1519 fira-share-save-slots
1520 Common Report Var(flag_ira_share_save_slots) Init(1)
1521 Share slots for saving different hard registers.
1522
1523 fira-share-spill-slots
1524 Common Report Var(flag_ira_share_spill_slots) Init(1)
1525 Share stack slots for spilled pseudo-registers.
1526
1527 fira-verbose=
1528 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1529 -fira-verbose=<number>  Control IRA's level of diagnostic messages.
1530
1531 fivopts
1532 Common Report Var(flag_ivopts) Init(1) Optimization
1533 Optimize induction variables on trees
1534
1535 fjump-tables
1536 Common Var(flag_jump_tables) Init(1) Optimization
1537 Use jump tables for sufficiently large switch statements
1538
1539 fkeep-inline-functions
1540 Common Report Var(flag_keep_inline_functions)
1541 Generate code for functions even if they are fully inlined
1542
1543 fkeep-static-consts
1544 Common Report Var(flag_keep_static_consts) Init(1)
1545 Emit static const variables even if they are not used
1546
1547 fleading-underscore
1548 Common Report Var(flag_leading_underscore) Init(-1)
1549 Give external symbols a leading underscore
1550
1551 floop-optimize
1552 Common Ignore
1553 Does nothing.  Preserved for backward compatibility.
1554
1555 flto
1556 Common
1557 Enable link-time optimization.
1558
1559 flto=
1560 Common RejectNegative Joined Var(flag_lto)
1561 Link-time optimization with number of parallel jobs or jobserver.
1562
1563 Enum
1564 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1565
1566 EnumValue
1567 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1568
1569 EnumValue
1570 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1571
1572 EnumValue
1573 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1574
1575 EnumValue
1576 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1577
1578 EnumValue
1579 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1580
1581 flto-partition=
1582 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1583 Specify the algorithm to partition symbols and vars at linktime
1584
1585 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1586 flto-compression-level=
1587 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1588 -flto-compression-level=<number>        Use zlib compression level <number> for IL
1589
1590 flto-odr-type-merging
1591 Common Report Var(flag_lto_odr_type_mering) Init(1)
1592 Merge C++ types using One Definition Rule
1593
1594 flto-report
1595 Common Report Var(flag_lto_report) Init(0)
1596 Report various link-time optimization statistics
1597
1598 flto-report-wpa
1599 Common Report Var(flag_lto_report_wpa) Init(0)
1600 Report various link-time optimization statistics for WPA only
1601
1602 fmath-errno
1603 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1604 Set errno after built-in math functions
1605
1606 fmax-errors=
1607 Common Joined RejectNegative UInteger Var(flag_max_errors)
1608 -fmax-errors=<number>   Maximum number of errors to report
1609
1610 fmem-report
1611 Common Report Var(mem_report)
1612 Report on permanent memory allocation
1613
1614 fmem-report-wpa
1615 Common Report Var(mem_report_wpa)
1616 Report on permanent memory allocation in WPA only
1617
1618 ; This will attempt to merge constant section constants, if 1 only
1619 ; string constants and constants from constant pool, if 2 also constant
1620 ; variables.
1621 fmerge-all-constants
1622 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1623 Attempt to merge identical constants and constant variables
1624
1625 fmerge-constants
1626 Common Report Var(flag_merge_constants,1) Optimization
1627 Attempt to merge identical constants across compilation units
1628
1629 fmerge-debug-strings
1630 Common Report Var(flag_merge_debug_strings) Init(1)
1631 Attempt to merge identical debug strings across compilation units
1632
1633 fmessage-length=
1634 Common RejectNegative Joined UInteger
1635 -fmessage-length=<number>       Limit diagnostics to <number> characters per line.  0 suppresses line-wrapping
1636
1637 fmodulo-sched
1638 Common Report Var(flag_modulo_sched) Optimization
1639 Perform SMS based modulo scheduling before the first scheduling pass
1640
1641 fmodulo-sched-allow-regmoves
1642 Common Report Var(flag_modulo_sched_allow_regmoves)
1643 Perform SMS based modulo scheduling with register moves allowed
1644
1645 fmove-loop-invariants
1646 Common Report Var(flag_move_loop_invariants) Optimization
1647 Move loop invariant computations out of loops
1648
1649 fdce
1650 Common Var(flag_dce) Init(1) Optimization
1651 Use the RTL dead code elimination pass
1652
1653 fdse
1654 Common Var(flag_dse) Init(1) Optimization
1655 Use the RTL dead store elimination pass
1656
1657 freschedule-modulo-scheduled-loops
1658 Common Report Var(flag_resched_modulo_sched) Optimization
1659 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1660
1661 fnon-call-exceptions
1662 Common Report Var(flag_non_call_exceptions) Optimization
1663 Support synchronous non-call exceptions
1664
1665 fomit-frame-pointer
1666 Common Report Var(flag_omit_frame_pointer) Optimization
1667 When possible do not generate stack frames
1668
1669 fopt-info
1670 Common Report Var(flag_opt_info) Optimization
1671 Enable all optimization info dumps on stderr
1672
1673 fopt-info-
1674 Common Joined RejectNegative Var(common_deferred_options) Defer
1675 -fopt-info[-<type>=filename]    Dump compiler optimization details
1676
1677 foptimize-register-move
1678 Common Ignore
1679 Does nothing. Preserved for backward compatibility.
1680
1681 foptimize-sibling-calls
1682 Common Report Var(flag_optimize_sibling_calls) Optimization
1683 Optimize sibling and tail recursive calls
1684
1685 fpartial-inlining
1686 Common Report Var(flag_partial_inlining)
1687 Perform partial inlining
1688
1689 fpre-ipa-mem-report
1690 Common Report Var(pre_ipa_mem_report)
1691 Report on memory allocation before interprocedural optimization
1692
1693 fpost-ipa-mem-report
1694 Common Report Var(post_ipa_mem_report)
1695 Report on memory allocation before interprocedural optimization
1696
1697 fpack-struct
1698 Common Report Var(flag_pack_struct) Optimization
1699 Pack structure members together without holes
1700
1701 fpack-struct=
1702 Common RejectNegative Joined UInteger Optimization
1703 -fpack-struct=<number>  Set initial maximum structure member alignment
1704
1705 fpcc-struct-return
1706 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1707 Return small aggregates in memory, not registers
1708
1709 fpeel-loops
1710 Common Report Var(flag_peel_loops) Optimization
1711 Perform loop peeling
1712
1713 fpeephole
1714 Common Report Var(flag_no_peephole,0) Optimization
1715 Enable machine specific peephole optimizations
1716
1717 fpeephole2
1718 Common Report Var(flag_peephole2) Optimization
1719 Enable an RTL peephole pass before sched2
1720
1721 fPIC
1722 Common Report Var(flag_pic,2) Negative(fPIE)
1723 Generate position-independent code if possible (large mode)
1724
1725 fPIE
1726 Common Report Var(flag_pie,2) Negative(fpic)
1727 Generate position-independent code for executables if possible (large mode)
1728
1729 fpic
1730 Common Report Var(flag_pic,1) Negative(fpie)
1731 Generate position-independent code if possible (small mode)
1732
1733 fpie
1734 Common Report Var(flag_pie,1) Negative(fPIC)
1735 Generate position-independent code for executables if possible (small mode)
1736
1737 fplugin=
1738 Common Joined RejectNegative Var(common_deferred_options) Defer
1739 Specify a plugin to load
1740
1741 fplugin-arg-
1742 Common Joined RejectNegative Var(common_deferred_options) Defer
1743 -fplugin-arg-<name>-<key>[=<value>]     Specify argument <key>=<value> for plugin <name>
1744
1745 fpredictive-commoning
1746 Common Report Var(flag_predictive_commoning) Optimization
1747 Run predictive commoning optimization.
1748
1749 fprefetch-loop-arrays
1750 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1751 Generate prefetch instructions, if available, for arrays in loops
1752
1753 fprofile
1754 Common Report Var(profile_flag)
1755 Enable basic program profiling code
1756
1757 fprofile-arcs
1758 Common Report Var(profile_arc_flag)
1759 Insert arc-based program profiling code
1760
1761 fprofile-dir=
1762 Common Joined RejectNegative Var(profile_data_prefix)
1763 Set the top-level directory for storing the profile data.
1764 The default is 'pwd'.
1765
1766 fprofile-correction
1767 Common Report Var(flag_profile_correction)
1768 Enable correction of flow inconsistent profile data input
1769
1770 fprofile-generate
1771 Common
1772 Enable common options for generating profile info for profile feedback directed optimizations
1773
1774 fprofile-generate=
1775 Common Joined RejectNegative
1776 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1777
1778 fprofile-use
1779 Common Var(flag_profile_use)
1780 Enable common options for performing profile feedback directed optimizations
1781
1782 fprofile-use=
1783 Common Joined RejectNegative
1784 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1785
1786 fprofile-values
1787 Common Report Var(flag_profile_values)
1788 Insert code to profile values of expressions
1789
1790 fprofile-report
1791 Common Report Var(profile_report)
1792 Report on consistency of profile
1793
1794 fprofile-reorder-functions
1795 Common Report Var(flag_profile_reorder_functions)
1796 Enable function reordering that improves code placement
1797
1798 frandom-seed
1799 Common Var(common_deferred_options) Defer
1800
1801 frandom-seed=
1802 Common Joined RejectNegative Var(common_deferred_options) Defer
1803 -frandom-seed=<string>  Make compile reproducible using <string>
1804
1805 ; This switch causes the command line that was used to create an
1806 ; object file to be recorded into the object file.  The exact format
1807 ; of this recording is target and binary file format dependent.
1808 ; It is related to the -fverbose-asm switch, but that switch only
1809 ; records information in the assembler output file as comments, so
1810 ; they never reach the object file.
1811 frecord-gcc-switches
1812 Common Report Var(flag_record_gcc_switches)
1813 Record gcc command line switches in the object file.
1814
1815 freg-struct-return
1816 Common Report Var(flag_pcc_struct_return,0) Optimization
1817 Return small aggregates in registers
1818
1819 fregmove
1820 Common Ignore
1821 Does nothing. Preserved for backward compatibility.
1822
1823 flive-range-shrinkage
1824 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
1825 Relief of register pressure through live range shrinkage
1826
1827 frename-registers
1828 Common Report Var(flag_rename_registers) Init(2) Optimization
1829 Perform a register renaming optimization pass
1830
1831 freorder-blocks
1832 Common Report Var(flag_reorder_blocks) Optimization
1833 Reorder basic blocks to improve code placement
1834
1835 freorder-blocks-and-partition
1836 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1837 Reorder basic blocks and partition into hot and cold sections
1838
1839 freorder-functions
1840 Common Report Var(flag_reorder_functions) Optimization
1841 Reorder functions to improve code placement
1842
1843 frerun-cse-after-loop
1844 Common Report Var(flag_rerun_cse_after_loop) Optimization
1845 Add a common subexpression elimination pass after loop optimizations
1846
1847 frerun-loop-opt
1848 Common Ignore
1849 Does nothing.  Preserved for backward compatibility.
1850
1851 frounding-math
1852 Common Report Var(flag_rounding_math) Optimization SetByCombined
1853 Disable optimizations that assume default FP rounding behavior
1854
1855 fsched-interblock
1856 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1857 Enable scheduling across basic blocks
1858
1859 fsched-pressure
1860 Common Report Var(flag_sched_pressure) Init(0) Optimization
1861 Enable register pressure sensitive insn scheduling
1862
1863 fsched-spec
1864 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1865 Allow speculative motion of non-loads
1866
1867 fsched-spec-load
1868 Common Report Var(flag_schedule_speculative_load) Optimization
1869 Allow speculative motion of some loads
1870
1871 fsched-spec-load-dangerous
1872 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1873 Allow speculative motion of more loads
1874
1875 fsched-verbose=
1876 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1877 -fsched-verbose=<number>        Set the verbosity level of the scheduler
1878
1879 fsched2-use-superblocks
1880 Common Report Var(flag_sched2_use_superblocks) Optimization
1881 If scheduling post reload, do superblock scheduling
1882
1883 fsched2-use-traces
1884 Common Ignore
1885 Does nothing.  Preserved for backward compatibility.
1886
1887 fschedule-insns
1888 Common Report Var(flag_schedule_insns) Optimization
1889 Reschedule instructions before register allocation
1890
1891 fschedule-insns2
1892 Common Report Var(flag_schedule_insns_after_reload) Optimization
1893 Reschedule instructions after register allocation
1894
1895 ; This flag should be on when a target implements non-trivial
1896 ; scheduling hooks, maybe saving some information for its own sake.
1897 ; On IA64, for example, this is used for correct bundling.
1898 fselective-scheduling
1899 Common Report Var(flag_selective_scheduling) Optimization
1900 Schedule instructions using selective scheduling algorithm
1901
1902 fselective-scheduling2
1903 Common Report Var(flag_selective_scheduling2) Optimization
1904 Run selective scheduling after reload
1905
1906 fsel-sched-pipelining
1907 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1908 Perform software pipelining of inner loops during selective scheduling
1909
1910 fsel-sched-pipelining-outer-loops
1911 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1912 Perform software pipelining of outer loops during selective scheduling
1913
1914 fsel-sched-reschedule-pipelined
1915 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1916 Reschedule pipelined regions without pipelining
1917
1918 fsemantic-interposition
1919 Common Report Var(flag_semantic_interposition) Init(1)
1920 Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker
1921
1922 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1923 ; of stalled insns into the ready list.
1924 fsched-stalled-insns
1925 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1926 Allow premature scheduling of queued insns
1927
1928 fsched-stalled-insns=
1929 Common RejectNegative Joined UInteger
1930 -fsched-stalled-insns=<number>  Set number of queued insns that can be prematurely scheduled
1931
1932 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1933 ; be examined for a dependency on a stalled insn that is candidate for
1934 ; premature removal from the queue of stalled insns into the ready list (has
1935 ; an effect only if the flag 'sched_stalled_insns' is set).
1936 fsched-stalled-insns-dep
1937 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1938 Set dependence distance checking in premature scheduling of queued insns
1939
1940 fsched-stalled-insns-dep=
1941 Common RejectNegative Joined UInteger
1942 -fsched-stalled-insns-dep=<number>      Set dependence distance checking in premature scheduling of queued insns
1943
1944 fsched-group-heuristic
1945 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1946 Enable the group heuristic in the scheduler
1947
1948 fsched-critical-path-heuristic
1949 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1950 Enable the critical path heuristic in the scheduler
1951
1952 fsched-spec-insn-heuristic
1953 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1954 Enable the speculative instruction heuristic in the scheduler
1955
1956 fsched-rank-heuristic
1957 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1958 Enable the rank heuristic in the scheduler
1959
1960 fsched-last-insn-heuristic
1961 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1962 Enable the last instruction heuristic in the scheduler
1963
1964 fsched-dep-count-heuristic
1965 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1966 Enable the dependent count heuristic in the scheduler
1967
1968 fsection-anchors
1969 Common Report Var(flag_section_anchors) Optimization
1970 Access data in the same section from shared anchor points
1971
1972 fsee
1973 Common Ignore
1974 Does nothing.  Preserved for backward compatibility.
1975
1976 fzee
1977 Common Ignore
1978 Does nothing.  Preserved for backward compatibility.
1979
1980 free
1981 Common Report Var(flag_ree) Init(0)
1982 Turn on Redundant Extensions Elimination pass.
1983
1984 fshow-column
1985 Common Report Var(flag_show_column) Init(1)
1986 Show column numbers in diagnostics, when available.  Default on
1987
1988 fshrink-wrap
1989 Common Report Var(flag_shrink_wrap) Optimization
1990 Emit function prologues only before parts of the function that need it,
1991 rather than at the top of the function.
1992
1993 fsignaling-nans
1994 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1995 Disable optimizations observable by IEEE signaling NaNs
1996
1997 fsigned-zeros
1998 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1999 Disable floating point optimizations that ignore the IEEE signedness of zero
2000
2001 fsingle-precision-constant
2002 Common Report Var(flag_single_precision_constant) Optimization
2003 Convert floating point constants to single precision constants
2004
2005 fsplit-ivs-in-unroller
2006 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
2007 Split lifetimes of induction variables when loops are unrolled
2008
2009 fsplit-stack
2010 Common Report Var(flag_split_stack) Init(-1)
2011 Generate discontiguous stack frames
2012
2013 fsplit-wide-types
2014 Common Report Var(flag_split_wide_types) Optimization
2015 Split wide types into independent registers
2016
2017 fssa-phiopt
2018 Common Report Var(flag_ssa_phiopt) Optimization
2019 Optimize conditional patterns using SSA PHI nodes
2020
2021 fvariable-expansion-in-unroller
2022 Common Report Var(flag_variable_expansion_in_unroller) Optimization
2023 Apply variable expansion when loops are unrolled
2024
2025 fstack-check=
2026 Common Report RejectNegative Joined
2027 -fstack-check=[no|generic|specific]     Insert stack checking code into the program
2028
2029 fstack-check
2030 Common Alias(fstack-check=, specific, no)
2031 Insert stack checking code into the program.  Same as -fstack-check=specific
2032
2033 fstack-limit
2034 Common Var(common_deferred_options) Defer
2035
2036 fstack-limit-register=
2037 Common RejectNegative Joined Var(common_deferred_options) Defer
2038 -fstack-limit-register=<register>       Trap if the stack goes past <register>
2039
2040 fstack-limit-symbol=
2041 Common RejectNegative Joined Var(common_deferred_options) Defer
2042 -fstack-limit-symbol=<name>     Trap if the stack goes past symbol <name>
2043
2044 fstack-protector
2045 Common Report Var(flag_stack_protect, 1)
2046 Use propolice as a stack protection method
2047
2048 fstack-protector-all
2049 Common Report RejectNegative Var(flag_stack_protect, 2)
2050 Use a stack protection method for every function
2051
2052 fstack-protector-strong
2053 Common Report RejectNegative Var(flag_stack_protect, 3)
2054 Use a smart stack protection method for certain functions
2055
2056 fstack-usage
2057 Common RejectNegative Var(flag_stack_usage)
2058 Output stack usage information on a per-function basis
2059
2060 fstrength-reduce
2061 Common Ignore
2062 Does nothing.  Preserved for backward compatibility.
2063
2064 ; Nonzero if we should do (language-dependent) alias analysis.
2065 ; Typically, this analysis will assume that expressions of certain
2066 ; types do not alias expressions of certain other types.  Only used
2067 ; if alias analysis (in general) is enabled.
2068 fstrict-aliasing
2069 Common Report Var(flag_strict_aliasing) Optimization
2070 Assume strict aliasing rules apply
2071
2072 fstrict-overflow
2073 Common Report Var(flag_strict_overflow)
2074 Treat signed overflow as undefined
2075
2076 fsync-libcalls
2077 Common Report Var(flag_sync_libcalls) Init(1)
2078 Implement __atomic operations via libcalls to legacy __sync functions
2079
2080 fsyntax-only
2081 Common Report Var(flag_syntax_only)
2082 Check for syntax errors, then stop
2083
2084 ftest-coverage
2085 Common Report Var(flag_test_coverage)
2086 Create data files needed by \"gcov\"
2087
2088 fthread-jumps
2089 Common Report Var(flag_thread_jumps) Optimization
2090 Perform jump threading optimizations
2091
2092 ftime-report
2093 Common Report Var(time_report)
2094 Report the time taken by each compiler pass
2095
2096 ftls-model=
2097 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2098 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec]      Set the default thread-local storage code generation model
2099
2100 Enum
2101 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2102
2103 EnumValue
2104 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2105
2106 EnumValue
2107 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2108
2109 EnumValue
2110 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2111
2112 EnumValue
2113 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2114
2115 ftoplevel-reorder
2116 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
2117 Reorder top level functions, variables, and asms
2118
2119 ftracer
2120 Common Report Var(flag_tracer)
2121 Perform superblock formation via tail duplication
2122
2123 ; Zero means that floating-point math operations cannot generate a
2124 ; (user-visible) trap.  This is the case, for example, in nonstop
2125 ; IEEE 754 arithmetic.
2126 ftrapping-math
2127 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2128 Assume floating-point operations can trap
2129
2130 ftrapv
2131 Common Report Var(flag_trapv) Optimization
2132 Trap for signed overflow in addition, subtraction and multiplication
2133
2134 ftree-ccp
2135 Common Report Var(flag_tree_ccp) Optimization
2136 Enable SSA-CCP optimization on trees
2137
2138 ftree-bit-ccp
2139 Common Report Var(flag_tree_bit_ccp) Optimization
2140 Enable SSA-BIT-CCP optimization on trees
2141
2142 ftree-store-ccp
2143 Common Ignore
2144 Does nothing.  Preserved for backward compatibility.
2145
2146 ftree-ch
2147 Common Report Var(flag_tree_ch) Optimization
2148 Enable loop header copying on trees
2149
2150 ftree-coalesce-inlined-vars
2151 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2152 Enable coalescing of copy-related user variables that are inlined
2153
2154 ftree-coalesce-vars
2155 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2156 Enable coalescing of all copy-related user variables
2157
2158 ftree-copyrename
2159 Common Report Var(flag_tree_copyrename) Optimization
2160 Replace SSA temporaries with better names in copies
2161
2162 ftree-copy-prop
2163 Common Report Var(flag_tree_copy_prop) Optimization
2164 Enable copy propagation on trees
2165
2166 ftree-store-copy-prop
2167 Common Ignore
2168 Does nothing.  Preserved for backward compatibility.
2169
2170 ftree-cselim
2171 Common Report Var(flag_tree_cselim) Init(2) Optimization
2172 Transform condition stores into unconditional ones
2173
2174 ftree-switch-conversion
2175 Common Report Var(flag_tree_switch_conversion) Optimization
2176 Perform conversions of switch initializations.
2177
2178 ftree-dce
2179 Common Report Var(flag_tree_dce) Optimization
2180 Enable SSA dead code elimination optimization on trees
2181
2182 ftree-dominator-opts
2183 Common Report Var(flag_tree_dom) Optimization
2184 Enable dominator optimizations
2185
2186 ftree-tail-merge
2187 Common Report Var(flag_tree_tail_merge) Optimization
2188 Enable tail merging on trees
2189
2190 ftree-dse
2191 Common Report Var(flag_tree_dse) Optimization
2192 Enable dead store elimination
2193
2194 ftree-forwprop
2195 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2196 Enable forward propagation on trees
2197
2198 ftree-fre
2199 Common Report Var(flag_tree_fre) Optimization
2200 Enable Full Redundancy Elimination (FRE) on trees
2201
2202 foptimize-strlen
2203 Common Report Var(flag_optimize_strlen) Optimization
2204 Enable string length optimizations on trees
2205
2206 fisolate-erroneous-paths-dereference
2207 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2208 Detect paths which trigger erroneous or undefined behaviour due to
2209 dereferencing a NULL pointer.  Isolate those paths from the main control
2210 flow and turn the statement with erroneous or undefined behaviour into a trap.
2211
2212 fisolate-erroneous-paths-attribute
2213 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2214 Detect paths which trigger erroneous or undefined behaviour due a NULL value
2215 being used in a way which is forbidden by a returns_nonnull or nonnull
2216 attribute.  Isolate those paths from the main control flow and turn the
2217 statement with erroneous or undefined behaviour into a trap.
2218
2219 ftree-loop-distribution
2220 Common Report Var(flag_tree_loop_distribution) Optimization
2221 Enable loop distribution on trees
2222
2223 ftree-loop-distribute-patterns
2224 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2225 Enable loop distribution for patterns transformed into a library call
2226
2227 ftree-loop-im
2228 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2229 Enable loop invariant motion on trees
2230
2231 ftree-loop-linear
2232 Common Alias(floop-interchange)
2233 Enable loop interchange transforms.  Same as -floop-interchange
2234
2235 ftree-loop-ivcanon
2236 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2237 Create canonical induction variables in loops
2238
2239 ftree-loop-optimize
2240 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2241 Enable loop optimizations on tree level
2242
2243 ftree-parallelize-loops=
2244 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2245 Enable automatic parallelization of loops
2246
2247 ftree-phiprop
2248 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2249 Enable hoisting loads from conditional pointers.
2250
2251 ftree-pre
2252 Common Report Var(flag_tree_pre) Optimization
2253 Enable SSA-PRE optimization on trees
2254
2255 ftree-partial-pre
2256 Common Report Var(flag_tree_partial_pre) Optimization
2257 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2258
2259 ftree-pta
2260 Common Report Var(flag_tree_pta) Optimization
2261 Perform function-local points-to analysis on trees.
2262
2263 ftree-reassoc
2264 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2265 Enable reassociation on tree level
2266
2267 ftree-salias
2268 Common Ignore
2269 Does nothing.  Preserved for backward compatibility.
2270
2271 ftree-sink
2272 Common Report Var(flag_tree_sink) Optimization
2273 Enable SSA code sinking on trees
2274
2275 ftree-slsr
2276 Common Report Var(flag_tree_slsr) Optimization
2277 Perform straight-line strength reduction
2278
2279 ftree-sra
2280 Common Report Var(flag_tree_sra) Optimization
2281 Perform scalar replacement of aggregates
2282
2283 ftree-ter
2284 Common Report Var(flag_tree_ter) Optimization
2285 Replace temporary expressions in the SSA->normal pass
2286
2287 ftree-lrs
2288 Common Report Var(flag_tree_live_range_split) Optimization
2289 Perform live range splitting during the SSA->normal pass
2290
2291 ftree-vrp
2292 Common Report Var(flag_tree_vrp) Init(0) Optimization
2293 Perform Value Range Propagation on trees
2294
2295 funit-at-a-time
2296 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2297 Compile whole compilation unit at a time
2298
2299 funroll-loops
2300 Common Report Var(flag_unroll_loops) Optimization
2301 Perform loop unrolling when iteration count is known
2302
2303 funroll-all-loops
2304 Common Report Var(flag_unroll_all_loops) Optimization
2305 Perform loop unrolling for all loops
2306
2307 ; Nonzero means that loop optimizer may assume that the induction variables
2308 ; that control loops do not overflow and that the loops with nontrivial
2309 ; exit condition are not infinite
2310 funsafe-loop-optimizations
2311 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2312 Allow loop optimizations to assume that the loops behave in normal way
2313
2314 fassociative-math
2315 Common Report Var(flag_associative_math) SetByCombined
2316 Allow optimization for floating-point arithmetic which may change the
2317 result of the operation due to rounding.
2318
2319 freciprocal-math
2320 Common Report Var(flag_reciprocal_math) SetByCombined
2321 Same as -fassociative-math for expressions which include division.
2322
2323 ; Nonzero means that unsafe floating-point math optimizations are allowed
2324 ; for the sake of speed.  IEEE compliance is not guaranteed, and operations
2325 ; are allowed to assume that their arguments and results are "normal"
2326 ; (e.g., nonnegative for SQRT).
2327 funsafe-math-optimizations
2328 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2329 Allow math optimizations that may violate IEEE or ISO standards
2330
2331 funswitch-loops
2332 Common Report Var(flag_unswitch_loops) Optimization
2333 Perform loop unswitching
2334
2335 funwind-tables
2336 Common Report Var(flag_unwind_tables) Optimization
2337 Just generate unwind tables for exception handling
2338
2339 fuse-ld=bfd
2340 Common Driver Negative(fuse-ld=gold)
2341 Use the bfd linker instead of the default linker
2342
2343 fuse-ld=gold
2344 Common Driver Negative(fuse-ld=bfd)
2345 Use the gold linker instead of the default linker
2346
2347 fuse-linker-plugin
2348 Common Undocumented Var(flag_use_linker_plugin)
2349
2350 ; Positive if we should track variables, negative if we should run
2351 ; the var-tracking pass only to discard debug annotations, zero if
2352 ; we're not to run it.  When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2353 ; will be set according to optimize, debug_info_level and debug_hooks
2354 ; in process_options ().
2355 fvar-tracking
2356 Common Report Var(flag_var_tracking) Init(2) Optimization
2357 Perform variable tracking
2358
2359 ; Positive if we should track variables at assignments, negative if
2360 ; we should run the var-tracking pass only to discard debug
2361 ; annotations.  When flag_var_tracking_assignments ==
2362 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2363 fvar-tracking-assignments
2364 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2365 Perform variable tracking by annotating assignments
2366
2367 ; Nonzero if we should toggle flag_var_tracking_assignments after
2368 ; processing options and computing its default.  */
2369 fvar-tracking-assignments-toggle
2370 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2371 Toggle -fvar-tracking-assignments
2372
2373 ; Positive if we should track uninitialized variables, negative if
2374 ; we should run the var-tracking pass only to discard debug
2375 ; annotations.  When flag_var_tracking_uninit == AUTODETECT_VALUE it
2376 ; will be set according to flag_var_tracking.
2377 fvar-tracking-uninit
2378 Common Report Var(flag_var_tracking_uninit) Optimization
2379 Perform variable tracking and also tag variables that are uninitialized
2380
2381 ftree-vectorize
2382 Common Report Var(flag_tree_vectorize) Optimization
2383 Enable vectorization on trees
2384
2385 ftree-vectorizer-verbose=
2386 Common Joined RejectNegative Ignore
2387 Does nothing.  Preserved for backward compatibility.
2388
2389 ftree-loop-vectorize
2390 Common Report Var(flag_tree_loop_vectorize) Optimization
2391 Enable loop vectorization on trees
2392
2393 ftree-slp-vectorize
2394 Common Report Var(flag_tree_slp_vectorize) Optimization
2395 Enable basic block vectorization (SLP) on trees
2396
2397 fvect-cost-model=
2398 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT)
2399 Specifies the cost model for vectorization
2400
2401 fsimd-cost-model=
2402 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED)
2403 Specifies the vectorization cost model for code marked with a simd directive
2404
2405 Enum
2406 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2407
2408 EnumValue
2409 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2410
2411 EnumValue
2412 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2413
2414 EnumValue
2415 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2416
2417 fvect-cost-model
2418 Common RejectNegative Alias(fvect-cost-model=,dynamic)
2419 Enables the dynamic vectorizer cost model.  Preserved for backward compatibility.
2420
2421 fno-vect-cost-model
2422 Common RejectNegative Alias(fvect-cost-model=,unlimited)
2423 Enables the unlimited vectorizer cost model.  Preserved for backward compatibility.
2424
2425 ftree-vect-loop-version
2426 Common Ignore
2427 Does nothing. Preserved for backward compatibility.
2428
2429 ftree-scev-cprop
2430 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2431 Enable copy propagation of scalar-evolution information.
2432
2433 ; -fverbose-asm causes extra commentary information to be produced in
2434 ; the generated assembly code (to make it more readable).  This option
2435 ; is generally only of use to those who actually need to read the
2436 ; generated assembly code (perhaps while debugging the compiler itself).
2437 ; -fno-verbose-asm, the default, causes the extra information
2438 ; to not be added and is useful when comparing two assembler files.
2439 fverbose-asm
2440 Common Report Var(flag_verbose_asm)
2441 Add extra commentary to assembler output
2442
2443 fvisibility=
2444 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2445 -fvisibility=[default|internal|hidden|protected]        Set the default symbol visibility
2446
2447 Enum
2448 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2449
2450 EnumValue
2451 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2452
2453 EnumValue
2454 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2455
2456 EnumValue
2457 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2458
2459 EnumValue
2460 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2461
2462 fvtable-verify=
2463 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2464 Validate vtable pointers before using them.
2465
2466 Enum
2467 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2468
2469 EnumValue
2470 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2471
2472 EnumValue
2473 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2474
2475 EnumValue
2476 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2477
2478 fvtv-counts
2479 Common Var(flag_vtv_counts)
2480 Output vtable verification counters.
2481
2482 fvtv-debug
2483 Common Var(flag_vtv_debug)
2484 Output vtable verification pointer sets information.
2485
2486 fvpt
2487 Common Report Var(flag_value_profile_transformations) Optimization
2488 Use expression value profiles in optimizations
2489
2490 fweb
2491 Common Report Var(flag_web) Init(2) Optimization
2492 Construct webs and split unrelated uses of single variable
2493
2494 ftree-builtin-call-dce
2495 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2496 Enable conditional dead code elimination for builtin calls
2497
2498 fwhole-program
2499 Common Report Var(flag_whole_program) Init(0) Optimization
2500 Perform whole program optimizations
2501
2502 fwrapv
2503 Common Report Var(flag_wrapv) Optimization
2504 Assume signed arithmetic overflow wraps around
2505
2506 fzero-initialized-in-bss
2507 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2508 Put zero initialized data in the bss section
2509
2510 g
2511 Common JoinedOrMissing
2512 Generate debug information in default format
2513
2514 gcoff
2515 Common JoinedOrMissing Negative(gdwarf)
2516 Generate debug information in COFF format
2517
2518 gdwarf
2519 Common JoinedOrMissing Negative(gdwarf-)
2520 Generate debug information in default version of DWARF format
2521
2522 gdwarf-
2523 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2524 Generate debug information in DWARF v2 (or later) format
2525
2526 ggdb
2527 Common JoinedOrMissing
2528 Generate debug information in default extended format
2529
2530 gno-pubnames
2531 Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2532 Don't generate DWARF pubnames and pubtypes sections.
2533
2534 gpubnames
2535 Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2536 Generate DWARF pubnames and pubtypes sections.
2537
2538 ggnu-pubnames
2539 Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2540 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2541
2542 gno-record-gcc-switches
2543 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2544 Don't record gcc command line switches in DWARF DW_AT_producer.
2545
2546 grecord-gcc-switches
2547 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2548 Record gcc command line switches in DWARF DW_AT_producer.
2549
2550 gno-split-dwarf
2551 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2552 Don't generate debug information in separate .dwo files
2553
2554 gsplit-dwarf
2555 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2556 Generate debug information in separate .dwo files
2557
2558 gstabs
2559 Common JoinedOrMissing Negative(gstabs+)
2560 Generate debug information in STABS format
2561
2562 gstabs+
2563 Common JoinedOrMissing Negative(gvms)
2564 Generate debug information in extended STABS format
2565
2566 gno-strict-dwarf
2567 Common RejectNegative Var(dwarf_strict,0) Init(0)
2568 Emit DWARF additions beyond selected version
2569
2570 gstrict-dwarf
2571 Common Report RejectNegative Var(dwarf_strict,1)
2572 Don't emit DWARF additions beyond selected version
2573
2574 gtoggle
2575 Common Report Var(flag_gtoggle)
2576 Toggle debug information generation
2577
2578 gvms
2579 Common JoinedOrMissing Negative(gxcoff)
2580 Generate debug information in VMS format
2581
2582 gxcoff
2583 Common JoinedOrMissing Negative(gxcoff+)
2584 Generate debug information in XCOFF format
2585
2586 gxcoff+
2587 Common JoinedOrMissing Negative(gcoff)
2588 Generate debug information in extended XCOFF format
2589
2590 Enum
2591 Name(compressed_debug_sections) Type(int)
2592
2593 ; Since -gz= is completely handled in specs, the values aren't used and we
2594 ; assign arbitrary constants.
2595 EnumValue
2596 Enum(compressed_debug_sections) String(none) Value(0)
2597
2598 EnumValue
2599 Enum(compressed_debug_sections) String(zlib) Value(1)
2600
2601 EnumValue
2602 Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
2603
2604 gz
2605 Common Driver
2606 Generate compressed debug sections
2607
2608 gz=
2609 Common Driver Joined Enum(compressed_debug_sections)
2610 -gz=<format>    Generate compressed debug sections in format <format>
2611
2612 h
2613 Driver Joined Separate
2614
2615 iplugindir=
2616 Common Joined Var(plugindir_string) Init(0)
2617 -iplugindir=<dir>       Set <dir> to be the default plugin directory
2618
2619 imultiarch
2620 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2621 -imultiarch <dir>       Set <dir> to be the multiarch include subdirectory
2622
2623 l
2624 Driver Joined Separate
2625
2626 n
2627 Driver
2628
2629 no-canonical-prefixes
2630 Driver
2631
2632 nodefaultlibs
2633 Driver
2634
2635 nostartfiles
2636 Driver
2637
2638 nostdlib
2639 Driver
2640
2641 o
2642 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2643 -o <file>       Place output into <file>
2644
2645 p
2646 Common Var(profile_flag)
2647 Enable function profiling
2648
2649 pass-exit-codes
2650 Driver Var(pass_exit_codes)
2651
2652 pedantic
2653 Common Alias(Wpedantic)
2654
2655 pedantic-errors
2656 Common Var(flag_pedantic_errors)
2657 Like -pedantic but issue them as errors
2658
2659 pg
2660 Driver
2661
2662 pipe
2663 Driver Var(use_pipes)
2664
2665 print-file-name=
2666 Driver JoinedOrMissing Var(print_file_name)
2667
2668 print-libgcc-file-name
2669 Driver
2670
2671 print-multi-directory
2672 Driver Var(print_multi_directory)
2673
2674 print-multi-lib
2675 Driver Var(print_multi_lib)
2676
2677 print-multi-os-directory
2678 Driver Var(print_multi_os_directory)
2679
2680 print-multiarch
2681 Driver Var(print_multiarch)
2682
2683 print-prog-name=
2684 Driver JoinedOrMissing Var(print_prog_name)
2685
2686 print-search-dirs
2687 Driver Var(print_search_dirs)
2688
2689 print-sysroot
2690 Driver Var(print_sysroot)
2691
2692 print-sysroot-headers-suffix
2693 Driver Var(print_sysroot_headers_suffix)
2694
2695 quiet
2696 Common Var(quiet_flag) RejectDriver
2697 Do not display functions compiled or elapsed time
2698
2699 r
2700 Driver
2701
2702 s
2703 Driver
2704
2705 save-temps
2706 Driver
2707
2708 save-temps=
2709 Driver Joined
2710
2711 t
2712 Driver
2713
2714 time
2715 Driver Var(report_times)
2716
2717 time=
2718 Driver JoinedOrMissing
2719
2720 u
2721 Driver Joined Separate
2722
2723 undef
2724 Driver
2725 ; C option, but driver must not handle as "-u ndef".
2726
2727 v
2728 Common Driver Var(verbose_flag)
2729 Enable verbose output
2730
2731 version
2732 Common Var(version_flag) RejectDriver
2733 Display the compiler's version
2734
2735 w
2736 Common Var(inhibit_warnings)
2737 Suppress warnings
2738
2739 wrapper
2740 Driver Separate Var(wrapper_string)
2741
2742 x
2743 Driver Joined Separate
2744
2745 shared
2746 Driver RejectNegative Negative(pie)
2747 Create a shared library
2748
2749 shared-libgcc
2750 Driver
2751
2752 specs
2753 Driver Separate Alias(specs=)
2754
2755 specs=
2756 Driver Joined
2757
2758 static
2759 Driver
2760
2761 static-libgcc
2762 Driver
2763
2764 static-libgfortran
2765 Driver
2766 ; Documented for Fortran, but always accepted by driver.
2767
2768 static-libstdc++
2769 Driver
2770
2771 static-libgo
2772 Driver
2773 ; Documented for Go, but always accepted by driver.
2774
2775 static-libasan
2776 Driver
2777
2778 static-libtsan
2779 Driver
2780
2781 static-liblsan
2782 Driver
2783
2784 static-libubsan
2785 Driver
2786
2787 symbolic
2788 Driver
2789
2790 pie
2791 Driver RejectNegative Negative(shared)
2792 Create a position independent executable
2793
2794 z
2795 Driver Joined Separate
2796
2797 fuse-caller-save
2798 Common Report Var(flag_use_caller_save) Optimization
2799 Use caller save register across calls if possible
2800
2801 ; This comment is to ensure we retain the blank line above.