1 ; Options for the language- and target-independent parts of the compiler.
3 ; Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
5 ; This file is part of GCC.
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
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
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
22 ; See the GCC internals manual for a description of this file's format.
24 ; Please try to keep this file in ASCII collating order.
28 Display this information
32 --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
41 Common Joined Separate UInteger
42 -G<number> Put global and static data smaller than <number> bytes into a special section (on some targets)
45 Common JoinedOrMissing
46 -O<number> Set optimization level to <number>
50 Optimize for space rather than speed
54 This switch is deprecated; use -Wextra instead
57 Common Var(warn_aggregate_return)
58 Warn about returning structures, unions or arrays
61 Common Var(warn_attributes) Init(1)
62 Warn about inappropriate attribute usage
65 Common Var(warn_cast_align)
66 Warn about pointer casts which increase alignment
68 Wdeprecated-declarations
69 Common Var(warn_deprecated_decl) Init(1)
70 Warn about uses of __attribute__((deprecated)) declarations
72 Wdisabled-optimization
73 Common Var(warn_disabled_optimization)
74 Warn when an optimization pass is disabled
77 Common Var(warnings_are_errors)
78 Treat all warnings as errors
82 Print extra (possibly unwanted) warnings
85 Common Var(flag_fatal_errors)
86 Exit on the first error occurred
89 Common Var(warn_inline)
90 Warn when an inlined function cannot be inlined
93 Common RejectNegative Joined UInteger
94 -Wlarger-than-<number> Warn if an object is larger than <number> bytes
96 Wunsafe-loop-optimizations
97 Common Var(warn_unsafe_loop_optimizations)
98 Warn if the loop cannot be optimized due to nontrivial assumptions.
101 Common Var(warn_missing_noreturn)
102 Warn about functions which might be candidates for __attribute__((noreturn))
105 Common Var(warn_packed)
106 Warn when the packed attribute has no effect on struct layout
109 Common Var(warn_padded)
110 Warn when padding is required to align structure members
113 Common Var(warn_shadow)
114 Warn when one local variable shadows another
117 Common Var(warn_stack_protect)
118 Warn when not issuing stack smashing protection for some reason
122 Warn about code which might break strict aliasing rules
125 Common Joined UInteger
126 Warn about code which might break strict aliasing rules
128 Wstring-literal-comparison
129 Common Var(warn_string_literal_comparison)
130 Warn about comparisons to constant string literals
133 Common Var(warn_switch)
134 Warn about enumerated switches, with no default, missing a case
137 Common Var(warn_switch_default)
138 Warn about enumerated switches missing a \"default:\" statement
141 Common Var(warn_switch_enum)
142 Warn about all enumerated switches missing a specific case
145 Common Var(warn_system_headers)
146 Do not suppress warnings from system headers
149 Common Var(warn_uninitialized)
150 Warn about uninitialized automatic variables
153 Common Var(warn_notreached)
154 Warn about code that will never be executed
158 Enable all -Wunused- warnings
161 Common Var(warn_unused_function)
162 Warn when a function is unused
165 Common Var(warn_unused_label)
166 Warn when a label is unused
169 Common Var(warn_unused_parameter)
170 Warn when a function parameter is unused
173 Common Var(warn_unused_value)
174 Warn when an expression value is unused
177 Common Var(warn_unused_variable)
178 Warn when a variable is unused
180 Wvolatile-register-var
181 Common Var(warn_register_var)
182 Warn when a register variable is declared volatile
186 -aux-info <file> Emit declaration information into <file>
199 -d<letters> Enable dumps from specific passes of the compiler
203 -dumpbase <file> Set the file basename to be used for dumps
205 ; The version of the C++ ABI in use. The following values are allowed:
207 ; 0: The version of the ABI believed most conformant with the C++ ABI
208 ; specification. This ABI may change as bugs are discovered and fixed.
209 ; Therefore, 0 will not necessarily indicate the same ABI in different
212 ; 1: The version of the ABI first used in G++ 3.2.
214 ; Additional positive integers will be assigned as new versions of
215 ; the ABI become the default version of the ABI.
217 Common Joined UInteger Var(flag_abi_version) Init(2)
220 Common Report Var(align_functions,0)
221 Align the start of functions
224 Common RejectNegative Joined UInteger
227 Common Report Var(align_jumps,0)
228 Align labels which are only reached by jumping
231 Common RejectNegative Joined UInteger
234 Common Report Var(align_labels,0)
238 Common RejectNegative Joined UInteger
241 Common Report Var(align_loops)
242 Align the start of loops
245 Common RejectNegative Joined UInteger
247 ; This flag is only tested if alias checking is enabled.
248 ; 0 if pointer arguments may alias each other. True in C.
249 ; 1 if pointer arguments may not alias each other but may alias
251 ; 2 if pointer arguments may not alias each other and may not
252 ; alias global variables. True in Fortran.
254 Common Report Var(flag_argument_noalias,0)
255 Specify that arguments may alias each other and globals
258 Common Report Var(flag_argument_noalias,1) VarExists
259 Assume arguments may alias globals but not each other
261 fargument-noalias-global
262 Common Report Var(flag_argument_noalias,2) VarExists
263 Assume arguments alias neither each other nor globals
265 fasynchronous-unwind-tables
266 Common Report Var(flag_asynchronous_unwind_tables)
267 Generate unwind tables that are exact at each instruction boundary
269 ; -fcheck-bounds causes gcc to generate array bounds checks.
270 ; For C, C++ and ObjC: defaults off.
271 ; For Java: defaults to on.
272 ; For Fortran: defaults to off.
274 Common Report Var(flag_bounds_check)
275 Generate code to check bounds before indexing arrays
278 Common Report Var(flag_branch_on_count_reg) Init(1)
279 Replace add, compare, branch with branch on count register
281 fbranch-probabilities
282 Common Report Var(flag_branch_probabilities)
283 Use profiling information for branch probabilities
285 fbranch-target-load-optimize
286 Common Report Var(flag_branch_target_load_optimize)
287 Perform branch target load optimization before prologue / epilogue threading
289 fbranch-target-load-optimize2
290 Common Report Var(flag_branch_target_load_optimize2)
291 Perform branch target load optimization after prologue / epilogue threading
294 Common Report Var(flag_btr_bb_exclusive)
295 Restrict target load migration not to re-use registers in any basic block
298 Common Joined RejectNegative
299 -fcall-saved-<register> Mark <register> as being preserved across functions
302 Common Joined RejectNegative
303 -fcall-used-<register> Mark <register> as being corrupted by function calls
305 ; Nonzero for -fcaller-saves: allocate values in regs that need to
306 ; be saved across function calls, if that produces overall better code.
307 ; Optional now, so people can test it.
309 Common Report Var(flag_caller_saves)
310 Save registers around function calls
313 Common Report Var(flag_no_common,0)
314 Do not put uninitialized globals in the common section
317 Common Report Var(flag_cprop_registers)
318 Perform a register copy-propagation optimization pass
321 Common Report Var(flag_crossjumping)
322 Perform cross-jumping optimization
325 Common Report Var(flag_cse_follow_jumps)
326 When running CSE, follow jumps to their targets
329 Common Report Var(flag_cse_skip_blocks)
330 When running CSE, follow conditional jumps
333 Common Report Var(flag_cx_limited_range)
334 Omit range reduction step when performing complex division
337 Common Report Var(flag_data_sections)
338 Place data items into their own section
340 ; Nonzero for -fdefer-pop: don't pop args after each function call
341 ; instead save them up to pop many calls' args with one insns.
343 Common Report Var(flag_defer_pop)
344 Defer popping functions args from stack until later
347 Common Report Var(flag_delayed_branch)
348 Attempt to fill delay slots of branch instructions
350 fdelete-null-pointer-checks
351 Common Report Var(flag_delete_null_pointer_checks)
352 Delete useless null pointer checks
354 fdiagnostics-show-location=
355 Common Joined RejectNegative
356 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
358 fdiagnostics-show-option
360 Amend appropriate diagnostic messages with the command line option that controls them
363 Common Joined RejectNegative
364 -fdump-<type> Dump various compiler internals to a file
367 Common Report Var(flag_dump_unnumbered) VarExists
368 Suppress output of instruction numbers and line number notes in debugging dumps
371 Common Report Var(flag_early_inlining) Init(1)
372 Perform early inlining
374 feliminate-dwarf2-dups
375 Common Report Var(flag_eliminate_dwarf2_dups)
376 Perform DWARF2 duplicate elimination
378 feliminate-unused-debug-symbols
379 Common Report Var(flag_debug_only_used_symbols)
380 Perform unused type elimination in debug info
382 feliminate-unused-debug-types
383 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
384 Perform unused type elimination in debug info
387 Common Report Var(flag_exceptions)
388 Enable exception handling
390 fexpensive-optimizations
391 Common Report Var(flag_expensive_optimizations)
392 Perform a number of minor, expensive optimizations
398 Common Report Var(flag_finite_math_only)
399 Assume no NaNs or infinities are generated
402 Common Joined RejectNegative
403 -ffixed-<register> Mark <register> as being unavailable to the compiler
406 Common Report Var(flag_float_store)
407 Don't allocate floats and doubles in extended-precision registers
409 ; Nonzero for -fforce-addr: load memory address into a register before
410 ; reference to memory. This makes better cse but slower compilation.
412 Common Report Var(flag_force_addr)
413 Copy memory address constants into registers before use
415 ; Nonzero for -fforce-mem: load memory value into a register
416 ; before arithmetic on it. This makes better cse but slower compilation.
418 Common Report Var(flag_force_mem)
419 Copy memory operands into registers before use
421 ; Nonzero means don't put addresses of constant functions in registers.
422 ; Used for compiling the Unix kernel, where strange substitutions are
423 ; done on the assembly output.
425 Common Report Var(flag_no_function_cse,0)
426 Allow function addresses to be held in registers
429 Common Report Var(flag_function_sections)
430 Place each function into its own section
433 Common Report Var(flag_gcse)
434 Perform global common subexpression elimination
437 Common Report Var(flag_gcse_lm) Init(1)
438 Perform enhanced load motion during global common subexpression elimination
441 Common Report Var(flag_gcse_sm) Init(0)
442 Perform store motion after global common subexpression elimination
445 Common Report Var(flag_gcse_las) Init(0)
446 Perform redundant load after store elimination in global common subexpression
450 Common Report Var(flag_gcse_after_reload)
451 Perform global common subexpression elimination after register allocation
454 fguess-branch-probability
455 Common Report Var(flag_guess_branch_prob)
456 Enable guessing of branch probabilities
458 ; Nonzero means ignore `#ident' directives. 0 means handle them.
459 ; Generate position-independent code for executables if possible
460 ; On SVR4 targets, it also controls whether or not to emit a
461 ; string identifying the compiler.
463 Common Report Var(flag_no_ident,0)
464 Process #ident directives
467 Common Report Var(flag_if_conversion)
468 Perform conversion of conditional jumps to branchless equivalents
471 Common Report Var(flag_if_conversion2)
472 Perform conversion of conditional jumps to conditional execution
474 ; -finhibit-size-directive inhibits output of .size for ELF.
475 ; This is used only for compiling crtstuff.c,
476 ; and it may be extended to other effects
477 ; needed for crtstuff.c on other systems.
478 finhibit-size-directive
479 Common Report Var(flag_inhibit_size_directive)
480 Do not generate .size directives
482 ; Nonzero means that functions declared `inline' will be treated
483 ; as `static'. Prevents generation of zillions of copies of unused
484 ; static inline functions; instead, `inlines' are written out
485 ; only when actually used. Used in conjunction with -g. Also
486 ; does the right thing with #pragma interface.
488 Common Report Var(flag_no_inline,0) Init(2)
489 Pay attention to the \"inline\" keyword
492 Common Report Var(flag_inline_functions)
493 Integrate simple functions into their callers
495 finline-functions-called-once
496 Common Report Var(flag_inline_functions_called_once) Init(1)
497 Integrate functions called once into their callers
500 Common RejectNegative Joined UInteger
503 Common RejectNegative Joined UInteger
504 -finline-limit=<number> Limit the size of inlined functions to <number>
506 finstrument-functions
507 Common Report Var(flag_instrument_function_entry_exit)
508 Instrument function entry and exit with profiling calls
511 Common Report Var(flag_ipa_cp)
512 Perform Interprocedural constant propagation
515 Common Report Var(flag_ipa_pure_const) Init(0)
516 Discover pure and const functions
519 Common Report Var(flag_ipa_reference) Init(0)
520 Discover readonly and non addressable static variables
523 Common Report Var(flag_ipa_type_escape) Init(0)
524 Type based escape and alias analysis
527 Common Report Var(flag_ivopts) Init(1)
528 Optimize induction variables on trees
531 Common Var(flag_jump_tables) Init(1)
532 Use jump tables for sufficiently large switch statements
534 fkeep-inline-functions
535 Common Report Var(flag_keep_inline_functions)
536 Generate code for functions even if they are fully inlined
539 Common Report Var(flag_keep_static_consts) Init(1)
540 Emit static const variables even if they are not used
543 Common Report Var(flag_leading_underscore) Init(-1)
544 Give external symbols a leading underscore
547 Common Report Var(flag_loop_optimize)
548 Perform loop optimizations
551 Common Report Var(flag_loop_optimize2)
552 Perform loop optimizations using the new loop optimizer
555 Common Report Var(flag_errno_math) Init(1)
556 Set errno after built-in math functions
559 Common Report Var(mem_report)
560 Report on permanent memory allocation
562 ; This will attempt to merge constant section constants, if 1 only
563 ; string constants and constants from constant pool, if 2 also constant
566 Common Report Var(flag_merge_constants,2) Init(1)
567 Attempt to merge identical constants and constant variables
570 Common Report Var(flag_merge_constants,1) VarExists
571 Attempt to merge identical constants across compilation units
574 Common RejectNegative Joined UInteger
575 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
578 Common Report Var(flag_modulo_sched)
579 Perform SMS based modulo scheduling before the first scheduling pass
581 fmove-loop-invariants
582 Common Report Var(flag_move_loop_invariants)
583 Move loop invariant computations out of loops
586 Common RejectNegative Report Var(flag_mudflap)
587 Add mudflap bounds-checking instrumentation for single-threaded program
590 Common RejectNegative Report Var(flag_mudflap_threads)
591 Add mudflap bounds-checking instrumentation for multi-threaded program
594 Common RejectNegative Report Var(flag_mudflap_ignore_reads)
595 Ignore read operations when inserting mudflap instrumentation
597 freschedule-modulo-scheduled-loops
598 Common Report Var(flag_resched_modulo_sched)
599 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
602 Common Report Var(flag_non_call_exceptions)
603 Support synchronous non-call exceptions
606 Common Report Var(flag_omit_frame_pointer)
607 When possible do not generate stack frames
609 foptimize-register-move
610 Common Report Var(flag_regmove)
611 Do the full register move optimization pass
613 foptimize-sibling-calls
614 Common Report Var(flag_optimize_sibling_calls)
615 Optimize sibling and tail recursive calls
618 Common Report Var(flag_pack_struct)
619 Pack structure members together without holes
622 Common RejectNegative Joined UInteger
623 -fpack-struct=<number> Set initial maximum structure member alignment
626 Common Report Var(flag_pcc_struct_return,1) VarExists
627 Return small aggregates in memory, not registers
630 Common Report Var(flag_peel_loops)
634 Common Report Var(flag_no_peephole,0)
635 Enable machine specific peephole optimizations
638 Common Report Var(flag_peephole2)
639 Enable an RTL peephole pass before sched2
642 Common Report Var(flag_pic,2)
643 Generate position-independent code if possible (large mode)
646 Common Report Var(flag_pie,2)
647 Generate position-independent code for executables if possible (large mode)
650 Common Report Var(flag_pic,1) VarExists
651 Generate position-independent code if possible (small mode)
654 Common Report Var(flag_pie,1) VarExists
655 Generate position-independent code for executables if possible (small mode)
657 fprefetch-loop-arrays
658 Common Report Var(flag_prefetch_loop_arrays)
659 Generate prefetch instructions, if available, for arrays in loops
662 Common Report Var(profile_flag)
663 Enable basic program profiling code
666 Common Report Var(profile_arc_flag)
667 Insert arc-based program profiling code
671 Enable common options for generating profile info for profile feedback directed optimizations
675 Enable common options for performing profile feedback directed optimizations
678 Common Report Var(flag_profile_values)
679 Insert code to profile values of expressions
685 Common Joined RejectNegative
686 -frandom-seed=<string> Make compile reproducible using <string>
689 Common Report Var(flag_pcc_struct_return,0) VarExists
690 Return small aggregates in registers
693 Common Report Var(flag_regmove)
694 Enables a register move optimization
697 Common Report Var(flag_rename_registers) Init(2)
698 Perform a register renaming optimization pass
701 Common Report Var(flag_reorder_blocks)
702 Reorder basic blocks to improve code placement
704 freorder-blocks-and-partition
705 Common Report Var(flag_reorder_blocks_and_partition)
706 Reorder basic blocks and partition into hot and cold sections
709 Common Report Var(flag_reorder_functions)
710 Reorder functions to improve code placement
712 frerun-cse-after-loop
713 Common Report Var(flag_rerun_cse_after_loop) Init(2)
714 Add a common subexpression elimination pass after loop optimizations
717 Common Report Var(flag_rerun_loop_opt)
718 Run the loop optimizer twice
721 Common Report Var(flag_rounding_math)
722 Disable optimizations that assume default FP rounding behavior
725 Common Report Var(flag_schedule_interblock) Init(1)
726 Enable scheduling across basic blocks
729 Common Report Var(flag_schedule_speculative) Init(1)
730 Allow speculative motion of non-loads
733 Common Report Var(flag_schedule_speculative_load)
734 Allow speculative motion of some loads
736 fsched-spec-load-dangerous
737 Common Report Var(flag_schedule_speculative_load_dangerous)
738 Allow speculative motion of more loads
741 Common RejectNegative Joined
742 -fsched-verbose=<number> Set the verbosity level of the scheduler
744 fsched2-use-superblocks
745 Common Report Var(flag_sched2_use_superblocks)
746 If scheduling post reload, do superblock scheduling
749 Common Report Var(flag_sched2_use_traces)
750 If scheduling post reload, do trace scheduling
753 Common Report Var(flag_schedule_insns)
754 Reschedule instructions before register allocation
757 Common Report Var(flag_schedule_insns_after_reload)
758 Reschedule instructions after register allocation
760 ; sched_stalled_insns means that insns can be moved prematurely from the queue
761 ; of stalled insns into the ready list.
763 Common Report Var(flag_sched_stalled_insns)
764 Allow premature scheduling of queued insns
766 fsched-stalled-insns=
767 Common RejectNegative Joined UInteger
768 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
770 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
771 ; be examined for a dependency on a stalled insn that is candidate for
772 ; premature removal from the queue of stalled insns into the ready list (has
773 ; an effect only if the flag 'sched_stalled_insns' is set).
774 fsched-stalled-insns-dep
775 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1)
776 Set dependence distance checking in premature scheduling of queued insns
778 fsched-stalled-insns-dep=
779 Common RejectNegative Joined UInteger
780 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
783 Common Report Var(flag_shared_data)
784 Mark data as shared rather than private
787 Common C ObjC C++ ObjC++ Report Var(flag_show_column) Init(1)
788 Show column numbers in diagnostics, when available. Default on
791 Common Report Var(flag_signaling_nans)
792 Disable optimizations observable by IEEE signaling NaNs
794 fsingle-precision-constant
795 Common Report Var(flag_single_precision_constant)
796 Convert floating point constants to single precision constants
798 fsplit-ivs-in-unroller
799 Common Report Var(flag_split_ivs_in_unroller) Init(1)
800 Split lifetimes of induction variables when loops are unrolled
802 fvariable-expansion-in-unroller
803 Common Report Var(flag_variable_expansion_in_unroller)
804 Apply variable expansion when loops are unrolled
806 ; Emit code to probe the stack, to help detect stack overflow; also
807 ; may cause large objects to be allocated dynamically.
809 Common Report Var(flag_stack_check)
810 Insert stack checking code into the program
815 fstack-limit-register=
816 Common RejectNegative Joined
817 -fstack-limit-register=<register> Trap if the stack goes past <register>
820 Common RejectNegative Joined
821 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
824 Common Report Var(flag_stack_protect, 1)
825 Use propolice as a stack protection method
828 Common Report RejectNegative Var(flag_stack_protect, 2) VarExists
829 Use a stack protection method for every function
832 Common Report Var(flag_strength_reduce)
833 Perform strength reduction optimizations
835 ; Nonzero if we should do (language-dependent) alias analysis.
836 ; Typically, this analysis will assume that expressions of certain
837 ; types do not alias expressions of certain other types. Only used
838 ; if alias analysis (in general) is enabled.
840 Common Report Var(flag_strict_aliasing)
841 Assume strict aliasing rules apply
844 Common Report Var(flag_syntax_only)
845 Check for syntax errors, then stop
848 Common Report Var(flag_test_coverage)
849 Create data files needed by \"gcov\"
852 Common Report Var(flag_thread_jumps)
853 Perform jump threading optimizations
856 Common Report Var(time_report)
857 Report the time taken by each compiler pass
860 Common Joined RejectNegative
861 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
864 Common Report Var(flag_tracer)
865 Perform superblock formation via tail duplication
867 ; Zero means that floating-point math operations cannot generate a
868 ; (user-visible) trap. This is the case, for example, in nonstop
869 ; IEEE 754 arithmetic.
871 Common Report Var(flag_trapping_math) Init(1)
872 Assume floating-point operations can trap
875 Common Report Var(flag_trapv)
876 Trap for signed overflow in addition, subtraction and multiplication
879 Common Report Var(flag_tree_ccp)
880 Enable SSA-CCP optimization on trees
883 Common Report Var(flag_tree_store_ccp)
884 Enable SSA-CCP optimization for stores and loads
887 Common Report Var(flag_tree_ch)
888 Enable loop header copying on trees
891 Common Report Var(flag_tree_combine_temps)
892 Coalesce memory temporaries in the SSA->normal pass
895 Common Report Var(flag_tree_copyrename)
896 Replace SSA temporaries with better names in copies
899 Common Report Var(flag_tree_copy_prop)
900 Enable copy propagation on trees
902 ftree-store-copy-prop
903 Common Report Var(flag_tree_store_copy_prop)
904 Enable copy propagation for stores and loads
907 Common Report Var(flag_tree_dce)
908 Enable SSA dead code elimination optimization on trees
911 Common Report Var(flag_tree_dom)
912 Enable dominator optimizations
915 Common Report Var(flag_tree_dse)
916 Enable dead store elimination
919 Common Report Var(flag_tree_fre)
920 Enable Full Redundancy Elimination (FRE) on trees
923 Common Report Var(flag_tree_loop_im) Init(1)
924 Enable loop invariant motion on trees
927 Common Report Var(flag_tree_loop_linear)
928 Enable linear loop transforms on trees
931 Common Report Var(flag_tree_loop_ivcanon) Init(1)
932 Create canonical induction variables in loops
935 Common Report Var(flag_tree_loop_optimize) Init(1)
936 Enable loop optimizations on tree level
939 Common Report Var(flag_tree_pre)
940 Enable SSA-PRE optimization on trees
943 Common Report Var(flag_tree_salias)
944 Perform structural alias analysis
947 Common Report Var(flag_tree_sink)
948 Enable SSA code sinking on trees
951 Common Report Var(flag_tree_sra)
952 Perform scalar replacement of aggregates
955 Common Report Var(flag_tree_ter)
956 Replace temporary expressions in the SSA->normal pass
959 Common Report Var(flag_tree_live_range_split)
960 Perform live range splitting during the SSA->normal pass
963 Common Report Var(flag_tree_vrp) Init(0)
964 Perform Value Range Propagation on trees
967 Common Report Var(flag_unit_at_a_time)
968 Compile whole compilation unit at a time
971 Common Report Var(flag_unroll_loops)
972 Perform loop unrolling when iteration count is known
975 Common Report Var(flag_unroll_all_loops)
976 Perform loop unrolling for all loops
978 ; Nonzero means that loop optimizer may assume that the induction variables
979 ; that control loops do not overflow and that the loops with nontrivial
980 ; exit condition are not infinite
981 funsafe-loop-optimizations
982 Common Report Var(flag_unsafe_loop_optimizations)
983 Allow loop optimizations to assume that the loops behave in normal way
985 ; Nonzero means that unsafe floating-point math optimizations are allowed
986 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
987 ; are allowed to assume that their arguments and results are "normal"
988 ; (e.g., nonnegative for SQRT).
989 funsafe-math-optimizations
990 Common Report Var(flag_unsafe_math_optimizations)
991 Allow math optimizations that may violate IEEE or ISO standards
994 Common Report Var(flag_unswitch_loops)
995 Perform loop unswitching
998 Common Report Var(flag_unwind_tables)
999 Just generate unwind tables for exception handling
1002 Common Report Var(flag_var_tracking) VarExists
1003 Perform variable tracking
1006 Common Report Var(flag_tree_vectorize)
1007 Enable loop vectorization on trees
1009 ftree-vect-loop-version
1010 Common Report Var(flag_tree_vect_loop_version) Init(1)
1011 Enable loop versioning when doing loop vectorization on trees
1013 ftree-vectorizer-verbose=
1014 Common RejectNegative Joined
1015 -ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
1017 ; -fverbose-asm causes extra commentary information to be produced in
1018 ; the generated assembly code (to make it more readable). This option
1019 ; is generally only of use to those who actually need to read the
1020 ; generated assembly code (perhaps while debugging the compiler itself).
1021 ; -fno-verbose-asm, the default, causes the extra information
1022 ; to not be added and is useful when comparing two assembler files.
1024 Common Report Var(flag_verbose_asm)
1025 Add extra commentary to assembler output
1028 Common Joined RejectNegative
1029 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
1033 Common Report Var(flag_value_profile_transformations)
1034 Use expression value profiles in optimizations
1037 Common Report Var(flag_web) Init(2)
1038 Construct webs and split unrelated uses of single variable
1041 Common Report Var(flag_whole_program) Init(0)
1042 Perform whole program optimizations
1045 Common Report Var(flag_wrapv)
1046 Assume signed arithmetic overflow wraps around
1048 fzero-initialized-in-bss
1049 Common Report Var(flag_zero_initialized_in_bss) Init(1)
1050 Put zero initialized data in the bss section
1053 Common JoinedOrMissing
1054 Generate debug information in default format
1057 Common JoinedOrMissing
1058 Generate debug information in COFF format
1061 Common JoinedOrMissing
1062 Generate debug information in DWARF v2 format
1065 Common JoinedOrMissing
1066 Generate debug information in default extended format
1069 Common JoinedOrMissing
1070 Generate debug information in STABS format
1073 Common JoinedOrMissing
1074 Generate debug information in extended STABS format
1077 Common JoinedOrMissing
1078 Generate debug information in VMS format
1081 Common JoinedOrMissing
1082 Generate debug information in XCOFF format
1085 Common JoinedOrMissing
1086 Generate debug information in extended XCOFF format
1089 Common Joined Separate
1090 -o <file> Place output into <file>
1093 Common Var(profile_flag)
1094 Enable function profiling
1097 Common Var(pedantic)
1098 Issue warnings needed for strict compliance to the standard
1102 Like -pedantic but issue them as errors
1105 Common Var(quiet_flag)
1106 Do not display functions compiled or elapsed time
1109 Common Var(version_flag)
1110 Display the compiler's version
1113 Common Var(inhibit_warnings)
1116 ; This comment is to ensure we retain the blank line above.