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