gcc/common.opt

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