gcc/common.opt

   1 ; Options for the language- and target-independent parts of the compiler.
   2
   3 ; Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
   4 ;
   5 ; This file is part of GCC.
   6 ;
   7 ; GCC is free software; you can redistribute it and/or modify it under
   8 ; the terms of the GNU General Public License as published by the Free
   9 ; Software Foundation; either version 2, or (at your option) any later
  10 ; version.
  11 ;
  12 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 ; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 ; for more details.
  16 ;
  17 ; You should have received a copy of the GNU General Public License
  18 ; along with GCC; see the file COPYING.  If not, write to the Free
  19 ; Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  20 ; 02110-1301, USA.
  21
  22 ; See the GCC internals manual for a description of this file's format.
  23
  24 ; Please try to keep this file in ASCII collating order.
  25
  26 -help
  27 Common
  28 Display this information
  29
  30 -param
  31 Common Separate
  32 --param <param>=<value> Set parameter <param> to value.  See below for a complete list of parameters
  33
  34 -target-help
  35 Common
  36
  37 -version
  38 Common
  39
  40 G
  41 Common Joined Separate UInteger
  42 -G<number>      Put global and static data smaller than <number> bytes into a special section (on some targets)
  43
  44 O
  45 Common JoinedOrMissing
  46 -O<number>      Set optimization level to <number>
  47
  48 Os
  49 Common
  50 Optimize for space rather than speed
  51
  52 W
  53 Common RejectNegative
  54 This switch is deprecated; use -Wextra instead
  55
  56 Waggregate-return
  57 Common Var(warn_aggregate_return)
  58 Warn about returning structures, unions or arrays
  59
  60 Walways-true
  61 Common Var(warn_always_true)
  62 Warn about comparisons that always evaluate to true
  63
  64 Wattributes
  65 Common Var(warn_attributes) Init(1)
  66 Warn about inappropriate attribute usage
  67
  68 Wcast-align
  69 Common Var(warn_cast_align)
  70 Warn about pointer casts which increase alignment
  71
  72 Wdeprecated-declarations
  73 Common Var(warn_deprecated_decl) Init(1)
  74 Warn about uses of __attribute__((deprecated)) declarations
  75
  76 Wdisabled-optimization
  77 Common Var(warn_disabled_optimization)
  78 Warn when an optimization pass is disabled
  79
  80 Werror
  81 Common Var(warnings_are_errors)
  82 Treat all warnings as errors
  83
  84 Werror=
  85 Common Joined
  86 Treat specified warning as error
  87
  88 Wextra
  89 Common
  90 Print extra (possibly unwanted) warnings
  91
  92 Wfatal-errors
  93 Common Var(flag_fatal_errors)
  94 Exit on the first error occurred
  95
  96 Winline
  97 Common Var(warn_inline)
  98 Warn when an inlined function cannot be inlined
  99
 100 Wlarger-than-
 101 Common RejectNegative Joined UInteger
 102 -Wlarger-than-<number>  Warn if an object is larger than <number> bytes
 103
 104 Wunsafe-loop-optimizations
 105 Common Var(warn_unsafe_loop_optimizations)
 106 Warn if the loop cannot be optimized due to nontrivial assumptions.
 107
 108 Wmissing-noreturn
 109 Common Var(warn_missing_noreturn)
 110 Warn about functions which might be candidates for __attribute__((noreturn))
 111
 112 Woverflow
 113 Common Var(warn_overflow) Init(1)
 114 Warn about overflow in arithmetic expressions
 115
 116 Wpacked
 117 Common Var(warn_packed)
 118 Warn when the packed attribute has no effect on struct layout
 119
 120 Wpadded
 121 Common Var(warn_padded)
 122 Warn when padding is required to align structure members
 123
 124 Wshadow
 125 Common Var(warn_shadow)
 126 Warn when one local variable shadows another
 127
 128 Wstack-protector
 129 Common Var(warn_stack_protect)
 130 Warn when not issuing stack smashing protection for some reason
 131
 132 Wstrict-aliasing
 133 Common
 134 Warn about code which might break strict aliasing rules
 135
 136 Wstrict-aliasing=
 137 Common Joined UInteger
 138 Warn about code which might break strict aliasing rules
 139
 140 Wstring-literal-comparison
 141 Common Var(warn_string_literal_comparison)
 142 Warn about comparisons to constant string literals
 143
 144 Wswitch
 145 Common Var(warn_switch)
 146 Warn about enumerated switches, with no default, missing a case
 147
 148 Wswitch-default
 149 Common Var(warn_switch_default)
 150 Warn about enumerated switches missing a \"default:\" statement
 151
 152 Wswitch-enum
 153 Common Var(warn_switch_enum)
 154 Warn about all enumerated switches missing a specific case
 155
 156 Wsystem-headers
 157 Common Var(warn_system_headers)
 158 Do not suppress warnings from system headers
 159
 160 Wuninitialized
 161 Common Var(warn_uninitialized)
 162 Warn about uninitialized automatic variables
 163
 164 Wunreachable-code
 165 Common Var(warn_notreached)
 166 Warn about code that will never be executed
 167
 168 Wunused
 169 Common
 170 Enable all -Wunused- warnings
 171
 172 Wunused-function
 173 Common Var(warn_unused_function)
 174 Warn when a function is unused
 175
 176 Wunused-label
 177 Common Var(warn_unused_label)
 178 Warn when a label is unused
 179
 180 Wunused-parameter
 181 Common Var(warn_unused_parameter)
 182 Warn when a function parameter is unused
 183
 184 Wunused-value
 185 Common Var(warn_unused_value)
 186 Warn when an expression value is unused
 187
 188 Wunused-variable
 189 Common Var(warn_unused_variable)
 190 Warn when a variable is unused
 191
 192 Wvolatile-register-var
 193 Common Var(warn_register_var)
 194 Warn when a register variable is declared volatile
 195
 196 aux-info
 197 Common Separate
 198 -aux-info <file>        Emit declaration information into <file>
 199
 200 aux-info=
 201 Common Joined
 202
 203 auxbase
 204 Common Separate
 205
 206 auxbase-strip
 207 Common Separate
 208
 209 d
 210 Common Joined
 211 -d<letters>     Enable dumps from specific passes of the compiler
 212
 213 dumpbase
 214 Common Separate
 215 -dumpbase <file>        Set the file basename to be used for dumps
 216
 217 ; The version of the C++ ABI in use.  The following values are allowed:
 218 ;
 219 ; 0: The version of the ABI believed most conformant with the C++ ABI
 220 ;    specification.  This ABI may change as bugs are discovered and fixed.
 221 ;    Therefore, 0 will not necessarily indicate the same ABI in different
 222 ;    versions of G++.
 223 ;
 224 ; 1: The version of the ABI first used in G++ 3.2.
 225 ;
 226 ; Additional positive integers will be assigned as new versions of
 227 ; the ABI become the default version of the ABI.
 228 fabi-version=
 229 Common Joined UInteger Var(flag_abi_version) Init(2)
 230
 231 falign-functions
 232 Common Report Var(align_functions,0)
 233 Align the start of functions
 234
 235 falign-functions=
 236 Common RejectNegative Joined UInteger
 237
 238 falign-jumps
 239 Common Report Var(align_jumps,0)
 240 Align labels which are only reached by jumping
 241
 242 falign-jumps=
 243 Common RejectNegative Joined UInteger
 244
 245 falign-labels
 246 Common Report Var(align_labels,0)
 247 Align all labels
 248
 249 falign-labels=
 250 Common RejectNegative Joined UInteger
 251
 252 falign-loops
 253 Common Report Var(align_loops)
 254 Align the start of loops
 255
 256 falign-loops=
 257 Common RejectNegative Joined UInteger
 258
 259 ; This flag is only tested if alias checking is enabled.
 260 ; 0 if pointer arguments may alias each other.  True in C.
 261 ; 1 if pointer arguments may not alias each other but may alias
 262 ;   global variables.
 263 ; 2 if pointer arguments may not alias each other and may not
 264 ;   alias global variables.
 265 ; 3 if pointer arguments may not alias anything.  True in Fortran.
 266 ;   Set by the front end.
 267 fargument-alias
 268 Common Report Var(flag_argument_noalias,0)
 269 Specify that arguments may alias each other and globals
 270
 271 fargument-noalias
 272 Common Report Var(flag_argument_noalias,1) VarExists
 273 Assume arguments may alias globals but not each other
 274
 275 fargument-noalias-global
 276 Common Report Var(flag_argument_noalias,2) VarExists
 277 Assume arguments alias neither each other nor globals
 278
 279 fargument-noalias-anything
 280 Common Report Var(flag_argument_noalias,3) VarExists
 281 Assume arguments alias no other storage
 282
 283 fasynchronous-unwind-tables
 284 Common Report Var(flag_asynchronous_unwind_tables)
 285 Generate unwind tables that are exact at each instruction boundary
 286
 287 ; -fcheck-bounds causes gcc to generate array bounds checks.
 288 ; For C, C++ and ObjC: defaults off.
 289 ; For Java: defaults to on.
 290 ; For Fortran: defaults to off.
 291 fbounds-check
 292 Common Report Var(flag_bounds_check)
 293 Generate code to check bounds before indexing arrays
 294
 295 fbranch-count-reg
 296 Common Report Var(flag_branch_on_count_reg) Init(1)
 297 Replace add, compare, branch with branch on count register
 298
 299 fbranch-probabilities
 300 Common Report Var(flag_branch_probabilities)
 301 Use profiling information for branch probabilities
 302
 303 fbranch-target-load-optimize
 304 Common Report Var(flag_branch_target_load_optimize)
 305 Perform branch target load optimization before prologue / epilogue threading
 306
 307 fbranch-target-load-optimize2
 308 Common Report Var(flag_branch_target_load_optimize2)
 309 Perform branch target load optimization after prologue / epilogue threading
 310
 311 fbtr-bb-exclusive
 312 Common Report Var(flag_btr_bb_exclusive)
 313 Restrict target load migration not to re-use registers in any basic block
 314
 315 fcall-saved-
 316 Common Joined RejectNegative
 317 -fcall-saved-<register> Mark <register> as being preserved across functions
 318
 319 fcall-used-
 320 Common Joined RejectNegative
 321 -fcall-used-<register>  Mark <register> as being corrupted by function calls
 322
 323 ; Nonzero for -fcaller-saves: allocate values in regs that need to
 324 ; be saved across function calls, if that produces overall better code.
 325 ; Optional now, so people can test it.
 326 fcaller-saves
 327 Common Report Var(flag_caller_saves)
 328 Save registers around function calls
 329
 330 fcommon
 331 Common Report Var(flag_no_common,0)
 332 Do not put uninitialized globals in the common section
 333
 334 fcprop-registers
 335 Common Report Var(flag_cprop_registers)
 336 Perform a register copy-propagation optimization pass
 337
 338 fcrossjumping
 339 Common Report Var(flag_crossjumping)
 340 Perform cross-jumping optimization
 341
 342 fcse-follow-jumps
 343 Common Report Var(flag_cse_follow_jumps)
 344 When running CSE, follow jumps to their targets
 345
 346 fcse-skip-blocks
 347 Common Report Var(flag_cse_skip_blocks)
 348 When running CSE, follow conditional jumps
 349
 350 fcx-limited-range
 351 Common Report Var(flag_cx_limited_range)
 352 Omit range reduction step when performing complex division
 353
 354 fdata-sections
 355 Common Report Var(flag_data_sections)
 356 Place data items into their own section
 357
 358 ; Nonzero for -fdefer-pop: don't pop args after each function call
 359 ; instead save them up to pop many calls' args with one insns.
 360 fdefer-pop
 361 Common Report Var(flag_defer_pop)
 362 Defer popping functions args from stack until later
 363
 364 fdelayed-branch
 365 Common Report Var(flag_delayed_branch)
 366 Attempt to fill delay slots of branch instructions
 367
 368 fdelete-null-pointer-checks
 369 Common Report Var(flag_delete_null_pointer_checks)
 370 Delete useless null pointer checks
 371
 372 fdiagnostics-show-location=
 373 Common Joined RejectNegative
 374 -fdiagnostics-show-location=[once|every-line]   How often to emit source location at the beginning of line-wrapped diagnostics
 375
 376 fdiagnostics-show-option
 377 Common
 378 Amend appropriate diagnostic messages with the command line option that controls them
 379
 380 fdump-
 381 Common Joined RejectNegative
 382 -fdump-<type>   Dump various compiler internals to a file
 383
 384 fdump-noaddr
 385 Common Report Var(flag_dump_noaddr)
 386 Suppress output of addresses in debugging dumps
 387
 388 fdump-unnumbered
 389 Common Report Var(flag_dump_unnumbered) VarExists
 390 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
 391
 392 fearly-inlining
 393 Common Report Var(flag_early_inlining) Init(1)
 394 Perform early inlining
 395
 396 feliminate-dwarf2-dups
 397 Common Report Var(flag_eliminate_dwarf2_dups)
 398 Perform DWARF2 duplicate elimination
 399
 400 feliminate-unused-debug-symbols
 401 Common Report Var(flag_debug_only_used_symbols)
 402 Perform unused type elimination in debug info
 403
 404 feliminate-unused-debug-types
 405 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
 406 Perform unused type elimination in debug info
 407
 408 femit-class-debug-always
 409 Common Report Var(flag_emit_class_debug_always) Init(1)
 410 Do not suppress C++ class debug information.
 411
 412 fexceptions
 413 Common Report Var(flag_exceptions)
 414 Enable exception handling
 415
 416 fexpensive-optimizations
 417 Common Report Var(flag_expensive_optimizations)
 418 Perform a number of minor, expensive optimizations
 419
 420 ffast-math
 421 Common
 422
 423 ffinite-math-only
 424 Common Report Var(flag_finite_math_only)
 425 Assume no NaNs or infinities are generated
 426
 427 ffixed-
 428 Common Joined RejectNegative
 429 -ffixed-<register>      Mark <register> as being unavailable to the compiler
 430
 431 ffloat-store
 432 Common Report Var(flag_float_store)
 433 Don't allocate floats and doubles in extended-precision registers
 434
 435 ; Nonzero for -fforce-addr: load memory address into a register before
 436 ; reference to memory.  This makes better cse but slower compilation.
 437 fforce-addr
 438 Common Report Var(flag_force_addr)
 439 Copy memory address constants into registers before use
 440
 441 ; Nonzero for -fforce-mem: load memory value into a register
 442 ; before arithmetic on it.  This makes better cse but slower compilation.
 443 fforce-mem
 444 Common Report Var(flag_force_mem)
 445 Copy memory operands into registers before use
 446
 447 fforward-propagate
 448 Common Report Var(flag_forward_propagate)
 449 Perform a forward propagation pass on RTL
 450
 451 ; Nonzero means don't put addresses of constant functions in registers.
 452 ; Used for compiling the Unix kernel, where strange substitutions are
 453 ; done on the assembly output.
 454 ffunction-cse
 455 Common Report Var(flag_no_function_cse,0)
 456 Allow function addresses to be held in registers
 457
 458 ffunction-sections
 459 Common Report Var(flag_function_sections)
 460 Place each function into its own section
 461
 462 fgcse
 463 Common Report Var(flag_gcse)
 464 Perform global common subexpression elimination
 465
 466 fgcse-lm
 467 Common Report Var(flag_gcse_lm) Init(1)
 468 Perform enhanced load motion during global common subexpression elimination
 469
 470 fgcse-sm
 471 Common Report Var(flag_gcse_sm) Init(0)
 472 Perform store motion after global common subexpression elimination
 473
 474 fgcse-las
 475 Common Report Var(flag_gcse_las) Init(0)
 476 Perform redundant load after store elimination in global common subexpression
 477 elimination
 478
 479 fgcse-after-reload
 480 Common Report Var(flag_gcse_after_reload)
 481 Perform global common subexpression elimination after register allocation
 482 has finished
 483
 484 fguess-branch-probability
 485 Common Report Var(flag_guess_branch_prob)
 486 Enable guessing of branch probabilities
 487
 488 ; Nonzero means ignore `#ident' directives.  0 means handle them.
 489 ; Generate position-independent code for executables if possible
 490 ; On SVR4 targets, it also controls whether or not to emit a
 491 ; string identifying the compiler.
 492 fident
 493 Common Report Var(flag_no_ident,0)
 494 Process #ident directives
 495
 496 fif-conversion
 497 Common Report Var(flag_if_conversion)
 498 Perform conversion of conditional jumps to branchless equivalents
 499
 500 fif-conversion2
 501 Common Report Var(flag_if_conversion2)
 502 Perform conversion of conditional jumps to conditional execution
 503
 504 ; -finhibit-size-directive inhibits output of .size for ELF.
 505 ; This is used only for compiling crtstuff.c,
 506 ; and it may be extended to other effects
 507 ; needed for crtstuff.c on other systems.
 508 finhibit-size-directive
 509 Common Report Var(flag_inhibit_size_directive)
 510 Do not generate .size directives
 511
 512 ; Nonzero means that functions declared `inline' will be treated
 513 ; as `static'.  Prevents generation of zillions of copies of unused
 514 ; static inline functions; instead, `inlines' are written out
 515 ; only when actually used.  Used in conjunction with -g.  Also
 516 ; does the right thing with #pragma interface.
 517 finline
 518 Common Report Var(flag_no_inline,0) Init(2)
 519 Pay attention to the \"inline\" keyword
 520
 521 finline-functions
 522 Common Report Var(flag_inline_functions)
 523 Integrate simple functions into their callers
 524
 525 finline-functions-called-once
 526 Common Report Var(flag_inline_functions_called_once) Init(1)
 527 Integrate functions called once into their callers
 528
 529 finline-limit-
 530 Common RejectNegative Joined UInteger
 531
 532 finline-limit=
 533 Common RejectNegative Joined UInteger
 534 -finline-limit=<number> Limit the size of inlined functions to <number>
 535
 536 finstrument-functions
 537 Common Report Var(flag_instrument_function_entry_exit)
 538 Instrument function entry and exit with profiling calls
 539
 540 fipa-cp
 541 Common Report Var(flag_ipa_cp)
 542 Perform Interprocedural constant propagation
 543
 544 fipa-pure-const
 545 Common Report Var(flag_ipa_pure_const) Init(0)
 546 Discover pure and const functions
 547
 548 fipa-pta
 549 Common Report Var(flag_ipa_pta) Init(0)
 550 Perform interprocedural points-to analysis
 551
 552 fipa-reference
 553 Common Report Var(flag_ipa_reference) Init(0)
 554 Discover readonly and non addressable static variables
 555
 556 fipa-type-escape
 557 Common Report Var(flag_ipa_type_escape) Init(0)
 558 Type based escape and alias analysis
 559
 560 fivopts
 561 Common Report Var(flag_ivopts) Init(1)
 562 Optimize induction variables on trees
 563
 564 fjump-tables
 565 Common Var(flag_jump_tables) Init(1)
 566 Use jump tables for sufficiently large switch statements
 567
 568 fkeep-inline-functions
 569 Common Report Var(flag_keep_inline_functions)
 570 Generate code for functions even if they are fully inlined
 571
 572 fkeep-static-consts
 573 Common Report Var(flag_keep_static_consts) Init(1)
 574 Emit static const variables even if they are not used
 575
 576 fleading-underscore
 577 Common Report Var(flag_leading_underscore) Init(-1)
 578 Give external symbols a leading underscore
 579
 580 floop-optimize
 581 Common
 582 Does nothing.  Preserved for backward compatibility.
 583
 584 fmath-errno
 585 Common Report Var(flag_errno_math) Init(1)
 586 Set errno after built-in math functions
 587
 588 fmem-report
 589 Common Report Var(mem_report)
 590 Report on permanent memory allocation
 591
 592 ; This will attempt to merge constant section constants, if 1 only
 593 ; string constants and constants from constant pool, if 2 also constant
 594 ; variables.
 595 fmerge-all-constants
 596 Common Report Var(flag_merge_constants,2) Init(1)
 597 Attempt to merge identical constants and constant variables
 598
 599 fmerge-constants
 600 Common Report Var(flag_merge_constants,1) VarExists
 601 Attempt to merge identical constants across compilation units
 602
 603 fmessage-length=
 604 Common RejectNegative Joined UInteger
 605 -fmessage-length=<number>       Limit diagnostics to <number> characters per line.  0 suppresses line-wrapping
 606
 607 fmodulo-sched
 608 Common Report Var(flag_modulo_sched)
 609 Perform SMS based modulo scheduling before the first scheduling pass
 610
 611 fmove-loop-invariants
 612 Common Report Var(flag_move_loop_invariants) Init(1)
 613 Move loop invariant computations out of loops
 614
 615 fmudflap
 616 Common RejectNegative Report Var(flag_mudflap)
 617 Add mudflap bounds-checking instrumentation for single-threaded program
 618
 619 fmudflapth
 620 Common RejectNegative Report VarExists Var(flag_mudflap,2)
 621 Add mudflap bounds-checking instrumentation for multi-threaded program
 622
 623 fmudflapir
 624 Common RejectNegative Report Var(flag_mudflap_ignore_reads)
 625 Ignore read operations when inserting mudflap instrumentation
 626
 627 freschedule-modulo-scheduled-loops
 628 Common Report Var(flag_resched_modulo_sched)
 629 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
 630
 631 fnon-call-exceptions
 632 Common Report Var(flag_non_call_exceptions)
 633 Support synchronous non-call exceptions
 634
 635 fomit-frame-pointer
 636 Common Report Var(flag_omit_frame_pointer)
 637 When possible do not generate stack frames
 638
 639 foptimize-register-move
 640 Common Report Var(flag_regmove)
 641 Do the full register move optimization pass
 642
 643 foptimize-sibling-calls
 644 Common Report Var(flag_optimize_sibling_calls)
 645 Optimize sibling and tail recursive calls
 646
 647 fpre-ipa-mem-report
 648 Common Report Var(pre_ipa_mem_report)
 649 Report on memory allocation before interprocedural optimization
 650
 651 fpost-ipa-mem-report
 652 Common Report Var(post_ipa_mem_report)
 653 Report on memory allocation before interprocedural optimization
 654
 655 fpack-struct
 656 Common Report Var(flag_pack_struct)
 657 Pack structure members together without holes
 658
 659 fpack-struct=
 660 Common RejectNegative Joined UInteger
 661 -fpack-struct=<number>  Set initial maximum structure member alignment
 662
 663 fpcc-struct-return
 664 Common Report Var(flag_pcc_struct_return,1) VarExists
 665 Return small aggregates in memory, not registers
 666
 667 fpeel-loops
 668 Common Report Var(flag_peel_loops)
 669 Perform loop peeling
 670
 671 fpeephole
 672 Common Report Var(flag_no_peephole,0)
 673 Enable machine specific peephole optimizations
 674
 675 fpeephole2
 676 Common Report Var(flag_peephole2)
 677 Enable an RTL peephole pass before sched2
 678
 679 fPIC
 680 Common Report Var(flag_pic,2)
 681 Generate position-independent code if possible (large mode)
 682
 683 fPIE
 684 Common Report Var(flag_pie,2)
 685 Generate position-independent code for executables if possible (large mode)
 686
 687 fpic
 688 Common Report Var(flag_pic,1) VarExists
 689 Generate position-independent code if possible (small mode)
 690
 691 fpie
 692 Common Report Var(flag_pie,1) VarExists
 693 Generate position-independent code for executables if possible (small mode)
 694
 695 fprefetch-loop-arrays
 696 Common Report Var(flag_prefetch_loop_arrays)
 697 Generate prefetch instructions, if available, for arrays in loops
 698
 699 fprofile
 700 Common Report Var(profile_flag)
 701 Enable basic program profiling code
 702
 703 fprofile-arcs
 704 Common Report Var(profile_arc_flag)
 705 Insert arc-based program profiling code
 706
 707 fprofile-generate
 708 Common
 709 Enable common options for generating profile info for profile feedback directed optimizations
 710
 711 fprofile-use
 712 Common
 713 Enable common options for performing profile feedback directed optimizations
 714
 715 fprofile-values
 716 Common Report Var(flag_profile_values)
 717 Insert code to profile values of expressions
 718
 719 frandom-seed
 720 Common
 721
 722 frandom-seed=
 723 Common Joined RejectNegative
 724 -frandom-seed=<string>  Make compile reproducible using <string>
 725
 726 ; This switch causes the command line that was used to create an
 727 ; object file to be recorded into the object file.  The exact format
 728 ; of this recording is target and binary file format dependent.
 729 ; It is related to the -fverbose-asm switch, but that switch only
 730 ; records information in the assembler output file as comments, so
 731 ; they never reach the object file.
 732 frecord-gcc-switches
 733 Common Report Var(flag_record_gcc_switches)
 734 Record gcc command line switches in the object file.
 735
 736 freg-struct-return
 737 Common Report Var(flag_pcc_struct_return,0) VarExists
 738 Return small aggregates in registers
 739
 740 fregmove
 741 Common Report Var(flag_regmove)
 742 Enables a register move optimization
 743
 744 frename-registers
 745 Common Report Var(flag_rename_registers) Init(2)
 746 Perform a register renaming optimization pass
 747
 748 freorder-blocks
 749 Common Report Var(flag_reorder_blocks)
 750 Reorder basic blocks to improve code placement
 751
 752 freorder-blocks-and-partition
 753 Common Report Var(flag_reorder_blocks_and_partition)
 754 Reorder basic blocks and partition into hot and cold sections
 755
 756 freorder-functions
 757 Common Report Var(flag_reorder_functions)
 758 Reorder functions to improve code placement
 759
 760 frerun-cse-after-loop
 761 Common Report Var(flag_rerun_cse_after_loop) Init(2)
 762 Add a common subexpression elimination pass after loop optimizations
 763
 764 frerun-loop-opt
 765 Common
 766 Does nothing.  Preserved for backward compatibility.
 767
 768 frounding-math
 769 Common Report Var(flag_rounding_math)
 770 Disable optimizations that assume default FP rounding behavior
 771
 772 fsched-interblock
 773 Common Report Var(flag_schedule_interblock) Init(1)
 774 Enable scheduling across basic blocks
 775
 776 fsched-spec
 777 Common Report Var(flag_schedule_speculative) Init(1)
 778 Allow speculative motion of non-loads
 779
 780 fsched-spec-load
 781 Common Report Var(flag_schedule_speculative_load)
 782 Allow speculative motion of some loads
 783
 784 fsched-spec-load-dangerous
 785 Common Report Var(flag_schedule_speculative_load_dangerous)
 786 Allow speculative motion of more loads
 787
 788 fsched-verbose=
 789 Common RejectNegative Joined
 790 -fsched-verbose=<number>        Set the verbosity level of the scheduler
 791
 792 fsched2-use-superblocks
 793 Common Report Var(flag_sched2_use_superblocks)
 794 If scheduling post reload, do superblock scheduling
 795
 796 fsched2-use-traces
 797 Common Report Var(flag_sched2_use_traces)
 798 If scheduling post reload, do trace scheduling
 799
 800 fschedule-insns
 801 Common Report Var(flag_schedule_insns)
 802 Reschedule instructions before register allocation
 803
 804 fschedule-insns2
 805 Common Report Var(flag_schedule_insns_after_reload)
 806 Reschedule instructions after register allocation
 807
 808 ; sched_stalled_insns means that insns can be moved prematurely from the queue
 809 ; of stalled insns into the ready list.
 810 fsched-stalled-insns
 811 Common Report Var(flag_sched_stalled_insns)
 812 Allow premature scheduling of queued insns
 813
 814 fsched-stalled-insns=
 815 Common RejectNegative Joined UInteger
 816 -fsched-stalled-insns=<number>  Set number of queued insns that can be prematurely scheduled
 817
 818 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
 819 ; be examined for a dependency on a stalled insn that is candidate for
 820 ; premature removal from the queue of stalled insns into the ready list (has
 821 ; an effect only if the flag 'sched_stalled_insns' is set).
 822 fsched-stalled-insns-dep
 823 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1)
 824 Set dependence distance checking in premature scheduling of queued insns
 825
 826 fsched-stalled-insns-dep=
 827 Common RejectNegative Joined UInteger
 828 -fsched-stalled-insns-dep=<number>      Set dependence distance checking in premature scheduling of queued insns
 829
 830 fsection-anchors
 831 Common Report Var(flag_section_anchors)
 832 Access data in the same section from shared anchor points
 833
 834 frtl-abstract-sequences
 835 Common Report Var(flag_rtl_seqabstr)
 836 Perform sequence abstraction optimization on RTL
 837
 838 fsee
 839 Common Report Var(flag_see) Init(0)
 840 Eliminate redundant sign extensions using LCM.
 841
 842 fshow-column
 843 Common C ObjC C++ ObjC++ Report Var(flag_show_column) Init(1)
 844 Show column numbers in diagnostics, when available.  Default on
 845
 846 fsignaling-nans
 847 Common Report Var(flag_signaling_nans)
 848 Disable optimizations observable by IEEE signaling NaNs
 849
 850 fsingle-precision-constant
 851 Common Report Var(flag_single_precision_constant)
 852 Convert floating point constants to single precision constants
 853
 854 fsplit-ivs-in-unroller
 855 Common Report Var(flag_split_ivs_in_unroller) Init(1)
 856 Split lifetimes of induction variables when loops are unrolled
 857
 858 fvariable-expansion-in-unroller
 859 Common Report Var(flag_variable_expansion_in_unroller)
 860 Apply variable expansion when loops are unrolled
 861
 862 ; Emit code to probe the stack, to help detect stack overflow; also
 863 ; may cause large objects to be allocated dynamically.
 864 fstack-check
 865 Common Report Var(flag_stack_check)
 866 Insert stack checking code into the program
 867
 868 fstack-limit
 869 Common
 870
 871 fstack-limit-register=
 872 Common RejectNegative Joined
 873 -fstack-limit-register=<register>       Trap if the stack goes past <register>
 874
 875 fstack-limit-symbol=
 876 Common RejectNegative Joined
 877 -fstack-limit-symbol=<name>     Trap if the stack goes past symbol <name>
 878
 879 fstack-protector
 880 Common Report Var(flag_stack_protect, 1)
 881 Use propolice as a stack protection method
 882
 883 fstack-protector-all
 884 Common Report RejectNegative Var(flag_stack_protect, 2) VarExists
 885 Use a stack protection method for every function
 886
 887 fstrength-reduce
 888 Common
 889 Does nothing.  Preserved for backward compatibility.
 890
 891 ; Nonzero if we should do (language-dependent) alias analysis.
 892 ; Typically, this analysis will assume that expressions of certain
 893 ; types do not alias expressions of certain other types.  Only used
 894 ; if alias analysis (in general) is enabled.
 895 fstrict-aliasing
 896 Common Report Var(flag_strict_aliasing)
 897 Assume strict aliasing rules apply
 898
 899 fsyntax-only
 900 Common Report Var(flag_syntax_only)
 901 Check for syntax errors, then stop
 902
 903 ftest-coverage
 904 Common Report Var(flag_test_coverage)
 905 Create data files needed by \"gcov\"
 906
 907 fthread-jumps
 908 Common Report Var(flag_thread_jumps)
 909 Perform jump threading optimizations
 910
 911 ftime-report
 912 Common Report Var(time_report)
 913 Report the time taken by each compiler pass
 914
 915 ftls-model=
 916 Common Joined RejectNegative
 917 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec]      Set the default thread-local storage code generation model
 918
 919 ftoplevel-reorder
 920 Common Report Var(flag_toplevel_reorder) Init(1)
 921 Reorder top level functions, variables, and asms
 922
 923 ftracer
 924 Common Report Var(flag_tracer)
 925 Perform superblock formation via tail duplication
 926
 927 ; Zero means that floating-point math operations cannot generate a
 928 ; (user-visible) trap.  This is the case, for example, in nonstop
 929 ; IEEE 754 arithmetic.
 930 ftrapping-math
 931 Common Report Var(flag_trapping_math) Init(1)
 932 Assume floating-point operations can trap
 933
 934 ftrapv
 935 Common Report Var(flag_trapv)
 936 Trap for signed overflow in addition, subtraction and multiplication
 937
 938 ftree-ccp
 939 Common Report Var(flag_tree_ccp)
 940 Enable SSA-CCP optimization on trees
 941
 942 ftree-store-ccp
 943 Common Report Var(flag_tree_store_ccp)
 944 Enable SSA-CCP optimization for stores and loads
 945
 946 ftree-ch
 947 Common Report Var(flag_tree_ch)
 948 Enable loop header copying on trees
 949
 950 ftree-copyrename
 951 Common Report Var(flag_tree_copyrename)
 952 Replace SSA temporaries with better names in copies
 953
 954 ftree-copy-prop
 955 Common Report Var(flag_tree_copy_prop)
 956 Enable copy propagation on trees
 957
 958 ftree-store-copy-prop
 959 Common Report Var(flag_tree_store_copy_prop)
 960 Enable copy propagation for stores and loads
 961
 962 ftree-dce
 963 Common Report Var(flag_tree_dce)
 964 Enable SSA dead code elimination optimization on trees
 965
 966 ftree-dominator-opts
 967 Common Report Var(flag_tree_dom)
 968 Enable dominator optimizations
 969
 970 ftree-dse
 971 Common Report Var(flag_tree_dse)
 972 Enable dead store elimination
 973
 974 ftree-fre
 975 Common Report Var(flag_tree_fre)
 976 Enable Full Redundancy Elimination (FRE) on trees
 977
 978 ftree-loop-im
 979 Common Report Var(flag_tree_loop_im) Init(1)
 980 Enable loop invariant motion on trees
 981
 982 ftree-loop-linear
 983 Common Report Var(flag_tree_loop_linear)
 984 Enable linear loop transforms on trees
 985
 986 ftree-loop-ivcanon
 987 Common Report Var(flag_tree_loop_ivcanon) Init(1)
 988 Create canonical induction variables in loops
 989
 990 ftree-loop-optimize
 991 Common Report Var(flag_tree_loop_optimize) Init(1)
 992 Enable loop optimizations on tree level
 993
 994 ftree-pre
 995 Common Report Var(flag_tree_pre)
 996 Enable SSA-PRE optimization on trees
 997
 998 ftree-salias
 999 Common Report Var(flag_tree_salias)
1000 Perform structural alias analysis
1001
1002 ftree-sink
1003 Common Report Var(flag_tree_sink)
1004 Enable SSA code sinking on trees
1005
1006 ftree-sra
1007 Common Report Var(flag_tree_sra)
1008 Perform scalar replacement of aggregates
1009
1010 ftree-ter
1011 Common Report Var(flag_tree_ter)
1012 Replace temporary expressions in the SSA->normal pass
1013
1014 ftree-vrp
1015 Common Report Var(flag_tree_vrp) Init(0)
1016 Perform Value Range Propagation on trees
1017
1018 funit-at-a-time
1019 Common Report Var(flag_unit_at_a_time)
1020 Compile whole compilation unit at a time
1021
1022 funroll-loops
1023 Common Report Var(flag_unroll_loops)
1024 Perform loop unrolling when iteration count is known
1025
1026 funroll-all-loops
1027 Common Report Var(flag_unroll_all_loops)
1028 Perform loop unrolling for all loops
1029
1030 ; Nonzero means that loop optimizer may assume that the induction variables
1031 ; that control loops do not overflow and that the loops with nontrivial
1032 ; exit condition are not infinite
1033 funsafe-loop-optimizations
1034 Common Report Var(flag_unsafe_loop_optimizations)
1035 Allow loop optimizations to assume that the loops behave in normal way
1036
1037 ; Nonzero means that unsafe floating-point math optimizations are allowed
1038 ; for the sake of speed.  IEEE compliance is not guaranteed, and operations
1039 ; are allowed to assume that their arguments and results are "normal"
1040 ; (e.g., nonnegative for SQRT).
1041 funsafe-math-optimizations
1042 Common Report Var(flag_unsafe_math_optimizations)
1043 Allow math optimizations that may violate IEEE or ISO standards
1044
1045 funswitch-loops
1046 Common Report Var(flag_unswitch_loops)
1047 Perform loop unswitching
1048
1049 funwind-tables
1050 Common Report Var(flag_unwind_tables)
1051 Just generate unwind tables for exception handling
1052
1053 fvar-tracking
1054 Common Report Var(flag_var_tracking) VarExists
1055 Perform variable tracking
1056
1057 ftree-vectorize
1058 Common Report Var(flag_tree_vectorize)
1059 Enable loop vectorization on trees
1060
1061 ftree-vect-loop-version
1062 Common Report Var(flag_tree_vect_loop_version) Init(1)
1063 Enable loop versioning when doing loop vectorization on trees
1064
1065 ftree-vectorizer-verbose=
1066 Common RejectNegative Joined
1067 -ftree-vectorizer-verbose=<number>      Set the verbosity level of the vectorizer
1068
1069 ; -fverbose-asm causes extra commentary information to be produced in
1070 ; the generated assembly code (to make it more readable).  This option
1071 ; is generally only of use to those who actually need to read the
1072 ; generated assembly code (perhaps while debugging the compiler itself).
1073 ; -fno-verbose-asm, the default, causes the extra information
1074 ; to not be added and is useful when comparing two assembler files.
1075 fverbose-asm
1076 Common Report Var(flag_verbose_asm)
1077 Add extra commentary to assembler output
1078
1079 fvisibility=
1080 Common Joined RejectNegative
1081 -fvisibility=[default|internal|hidden|protected]        Set the default symbol visibility
1082
1083
1084 fvpt
1085 Common Report Var(flag_value_profile_transformations)
1086 Use expression value profiles in optimizations
1087
1088 fweb
1089 Common Report Var(flag_web) Init(2)
1090 Construct webs and split unrelated uses of single variable
1091
1092 fwhole-program
1093 Common Report Var(flag_whole_program) Init(0)
1094 Perform whole program optimizations
1095
1096 fwrapv
1097 Common Report Var(flag_wrapv)
1098 Assume signed arithmetic overflow wraps around
1099
1100 fzero-initialized-in-bss
1101 Common Report Var(flag_zero_initialized_in_bss) Init(1)
1102 Put zero initialized data in the bss section
1103
1104 g
1105 Common JoinedOrMissing
1106 Generate debug information in default format
1107
1108 gcoff
1109 Common JoinedOrMissing Negative(gdwarf-2)
1110 Generate debug information in COFF format
1111
1112 gdwarf-2
1113 Common JoinedOrMissing Negative(gstabs)
1114 Generate debug information in DWARF v2 format
1115
1116 ggdb
1117 Common JoinedOrMissing
1118 Generate debug information in default extended format
1119
1120 gstabs
1121 Common JoinedOrMissing Negative(gstabs+)
1122 Generate debug information in STABS format
1123
1124 gstabs+
1125 Common JoinedOrMissing Negative(gvms)
1126 Generate debug information in extended STABS format
1127
1128 gvms
1129 Common JoinedOrMissing Negative(gxcoff)
1130 Generate debug information in VMS format
1131
1132 gxcoff
1133 Common JoinedOrMissing Negative(gxcoff+)
1134 Generate debug information in XCOFF format
1135
1136 gxcoff+
1137 Common JoinedOrMissing Negative(gcoff)
1138 Generate debug information in extended XCOFF format
1139
1140 o
1141 Common Joined Separate
1142 -o <file>       Place output into <file>
1143
1144 p
1145 Common Var(profile_flag)
1146 Enable function profiling
1147
1148 pedantic
1149 Common Var(pedantic)
1150 Issue warnings needed for strict compliance to the standard
1151
1152 pedantic-errors
1153 Common
1154 Like -pedantic but issue them as errors
1155
1156 quiet
1157 Common Var(quiet_flag)
1158 Do not display functions compiled or elapsed time
1159
1160 version
1161 Common Var(version_flag)
1162 Display the compiler's version
1163
1164 w
1165 Common Var(inhibit_warnings)
1166 Suppress warnings
1167
1168 ; This comment is to ensure we retain the blank line above.