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