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
97 Common Var(warn_missing_noreturn)
98 Warn about functions which might be candidates for __attribute__((noreturn))
101 Common Var(warn_packed)
102 Warn when the packed attribute has no effect on struct layout
105 Common Var(warn_padded)
106 Warn when padding is required to align structure members
109 Common Var(warn_shadow)
110 Warn when one local variable shadows another
113 Common Var(warn_stack_protect)
114 Warn when not issuing stack smashing protection for some reason
118 Warn about code which might break strict aliasing rules
121 Common Joined UInteger
122 Warn about code which might break strict aliasing rules
125 Common Var(warn_switch)
126 Warn about enumerated switches, with no default, missing a case
129 Common Var(warn_switch_default)
130 Warn about enumerated switches missing a \"default:\" statement
133 Common Var(warn_switch_enum)
134 Warn about all enumerated switches missing a specific case
137 Common Var(warn_system_headers)
138 Do not suppress warnings from system headers
141 Common Var(warn_uninitialized)
142 Warn about uninitialized automatic variables
145 Common Var(warn_notreached)
146 Warn about code that will never be executed
150 Enable all -Wunused- warnings
153 Common Var(warn_unused_function)
154 Warn when a function is unused
157 Common Var(warn_unused_label)
158 Warn when a label is unused
161 Common Var(warn_unused_parameter)
162 Warn when a function parameter is unused
165 Common Var(warn_unused_value)
166 Warn when an expression value is unused
169 Common Var(warn_unused_variable)
170 Warn when a variable is unused
174 -aux-info <file> Emit declaration information into <file>
187 -d<letters> Enable dumps from specific passes of the compiler
191 -dumpbase <file> Set the file basename to be used for dumps
193 ; The version of the C++ ABI in use. The following values are allowed:
195 ; 0: The version of the ABI believed most conformant with the C++ ABI
196 ; specification. This ABI may change as bugs are discovered and fixed.
197 ; Therefore, 0 will not necessarily indicate the same ABI in different
200 ; 1: The version of the ABI first used in G++ 3.2.
202 ; Additional positive integers will be assigned as new versions of
203 ; the ABI become the default version of the ABI.
205 Common Joined UInteger Var(flag_abi_version) Init(2)
208 Common Report Var(align_functions,0)
209 Align the start of functions
212 Common RejectNegative Joined UInteger
215 Common Report Var(align_jumps,0)
216 Align labels which are only reached by jumping
219 Common RejectNegative Joined UInteger
222 Common Report Var(align_labels,0)
226 Common RejectNegative Joined UInteger
229 Common Report Var(align_loops)
230 Align the start of loops
233 Common RejectNegative Joined UInteger
235 ; This flag is only tested if alias checking is enabled.
236 ; 0 if pointer arguments may alias each other. True in C.
237 ; 1 if pointer arguments may not alias each other but may alias
239 ; 2 if pointer arguments may not alias each other and may not
240 ; alias global variables. True in Fortran.
242 Common Report Var(flag_argument_noalias,0)
243 Specify that arguments may alias each other and globals
246 Common Report Var(flag_argument_noalias,1) VarExists
247 Assume arguments may alias globals but not each other
249 fargument-noalias-global
250 Common Report Var(flag_argument_noalias,2) VarExists
251 Assume arguments alias neither each other nor globals
253 fasynchronous-unwind-tables
254 Common Report Var(flag_asynchronous_unwind_tables)
255 Generate unwind tables that are exact at each instruction boundary
257 ; -fcheck-bounds causes gcc to generate array bounds checks.
258 ; For C, C++ and ObjC: defaults off.
259 ; For Java: defaults to on.
260 ; For Fortran: defaults to off.
262 Common Report Var(flag_bounds_check)
263 Generate code to check bounds before indexing arrays
266 Common Report Var(flag_branch_on_count_reg) Init(1)
267 Replace add, compare, branch with branch on count register
269 fbranch-probabilities
270 Common Report Var(flag_branch_probabilities)
271 Use profiling information for branch probabilities
273 fbranch-target-load-optimize
274 Common Report Var(flag_branch_target_load_optimize)
275 Perform branch target load optimization before prologue / epilogue threading
277 fbranch-target-load-optimize2
278 Common Report Var(flag_branch_target_load_optimize2)
279 Perform branch target load optimization after prologue / epilogue threading
282 Common Report Var(flag_btr_bb_exclusive)
283 Restrict target load migration not to re-use registers in any basic block
286 Common Joined RejectNegative
287 -fcall-saved-<register> Mark <register> as being preserved across functions
290 Common Joined RejectNegative
291 -fcall-used-<register> Mark <register> as being corrupted by function calls
293 ; Nonzero for -fcaller-saves: allocate values in regs that need to
294 ; be saved across function calls, if that produces overall better code.
295 ; Optional now, so people can test it.
297 Common Report Var(flag_caller_saves)
298 Save registers around function calls
301 Common Report Var(flag_no_common,0)
302 Do not put uninitialized globals in the common section
305 Common Report Var(flag_cprop_registers)
306 Perform a register copy-propagation optimization pass
309 Common Report Var(flag_crossjumping)
310 Perform cross-jumping optimization
313 Common Report Var(flag_cse_follow_jumps)
314 When running CSE, follow jumps to their targets
317 Common Report Var(flag_cse_skip_blocks)
318 When running CSE, follow conditional jumps
321 Common Report Var(flag_cx_limited_range)
322 Omit range reduction step when performing complex division
325 Common Report Var(flag_data_sections)
326 Place data items into their own section
328 ; Nonzero for -fdefer-pop: don't pop args after each function call
329 ; instead save them up to pop many calls' args with one insns.
331 Common Report Var(flag_defer_pop)
332 Defer popping functions args from stack until later
335 Common Report Var(flag_delayed_branch)
336 Attempt to fill delay slots of branch instructions
338 fdelete-null-pointer-checks
339 Common Report Var(flag_delete_null_pointer_checks)
340 Delete useless null pointer checks
342 fdiagnostics-show-location=
343 Common Joined RejectNegative
344 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
346 fdiagnostics-show-option
348 Amend appropriate diagnostic messages with the command line option that controls them
351 Common Joined RejectNegative
352 -fdump-<type> Dump various compiler internals to a file
355 Common Report Var(flag_dump_unnumbered) VarExists
356 Suppress output of instruction numbers and line number notes in debugging dumps
358 feliminate-dwarf2-dups
359 Common Report Var(flag_eliminate_dwarf2_dups)
360 Perform DWARF2 duplicate elimination
362 feliminate-unused-debug-symbols
363 Common Report Var(flag_debug_only_used_symbols)
364 Perform unused type elimination in debug info
366 feliminate-unused-debug-types
367 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
368 Perform unused type elimination in debug info
371 Common Report Var(flag_exceptions)
372 Enable exception handling
374 fexpensive-optimizations
375 Common Report Var(flag_expensive_optimizations)
376 Perform a number of minor, expensive optimizations
382 Common Report Var(flag_finite_math_only)
383 Assume no NaNs or infinities are generated
386 Common Joined RejectNegative
387 -ffixed-<register> Mark <register> as being unavailable to the compiler
390 Common Report Var(flag_float_store)
391 Don't allocate floats and doubles in extended-precision registers
393 ; Nonzero for -fforce-addr: load memory address into a register before
394 ; reference to memory. This makes better cse but slower compilation.
396 Common Report Var(flag_force_addr)
397 Copy memory address constants into registers before use
399 ; Nonzero for -fforce-mem: load memory value into a register
400 ; before arithmetic on it. This makes better cse but slower compilation.
402 Common Report Var(flag_force_mem)
403 Copy memory operands into registers before use
405 ; Nonzero means don't put addresses of constant functions in registers.
406 ; Used for compiling the Unix kernel, where strange substitutions are
407 ; done on the assembly output.
409 Common Report Var(flag_no_function_cse,0)
410 Allow function addresses to be held in registers
413 Common Report Var(flag_function_sections)
414 Place each function into its own section
417 Common Report Var(flag_gcse)
418 Perform global common subexpression elimination
421 Common Report Var(flag_gcse_lm) Init(1)
422 Perform enhanced load motion during global common subexpression elimination
425 Common Report Var(flag_gcse_sm) Init(0)
426 Perform store motion after global common subexpression elimination
429 Common Report Var(flag_gcse_las) Init(0)
430 Perform redundant load after store elimination in global common subexpression
434 Common Report Var(flag_gcse_after_reload)
435 Perform global common subexpression elimination after register allocation
438 fguess-branch-probability
439 Common Report Var(flag_guess_branch_prob)
440 Enable guessing of branch probabilities
442 ; Nonzero means ignore `#ident' directives. 0 means handle them.
443 ; Generate position-independent code for executables if possible
444 ; On SVR4 targets, it also controls whether or not to emit a
445 ; string identifying the compiler.
447 Common Report Var(flag_no_ident,0)
448 Process #ident directives
451 Common Report Var(flag_if_conversion)
452 Perform conversion of conditional jumps to branchless equivalents
455 Common Report Var(flag_if_conversion2)
456 Perform conversion of conditional jumps to conditional execution
458 ; -finhibit-size-directive inhibits output of .size for ELF.
459 ; This is used only for compiling crtstuff.c,
460 ; and it may be extended to other effects
461 ; needed for crtstuff.c on other systems.
462 finhibit-size-directive
463 Common Report Var(flag_inhibit_size_directive)
464 Do not generate .size directives
466 ; Nonzero means that functions declared `inline' will be treated
467 ; as `static'. Prevents generation of zillions of copies of unused
468 ; static inline functions; instead, `inlines' are written out
469 ; only when actually used. Used in conjunction with -g. Also
470 ; does the right thing with #pragma interface.
472 Common Report Var(flag_no_inline,0) Init(2)
473 Pay attention to the \"inline\" keyword
476 Common Report Var(flag_inline_functions)
477 Integrate simple functions into their callers
480 Common Report Var(flag_early_inlining) Init(1)
481 Perform early inlining
484 Common RejectNegative Joined UInteger
487 Common RejectNegative Joined UInteger
488 -finline-limit=<number> Limit the size of inlined functions to <number>
490 finstrument-functions
491 Common Report Var(flag_instrument_function_entry_exit)
492 Instrument function entry and exit with profiling calls
495 Common Report Var(flag_ivopts) Init(1)
496 Optimize induction variables on trees
499 Common Var(flag_jump_tables) Init(1)
500 Use jump tables for sufficiently large switch statements
502 fkeep-inline-functions
503 Common Report Var(flag_keep_inline_functions)
504 Generate code for functions even if they are fully inlined
507 Common Report Var(flag_keep_static_consts) Init(1)
508 Emit static const variables even if they are not used
511 Common Report Var(flag_leading_underscore) Init(-1)
512 Give external symbols a leading underscore
515 Common Report Var(flag_loop_optimize)
516 Perform loop optimizations
519 Common Report Var(flag_loop_optimize2)
520 Perform loop optimizations using the new loop optimizer
523 Common Report Var(flag_errno_math) Init(1)
524 Set errno after built-in math functions
527 Common Report Var(mem_report)
528 Report on permanent memory allocation
530 ; This will attempt to merge constant section constants, if 1 only
531 ; string constants and constants from constant pool, if 2 also constant
534 Common Report Var(flag_merge_constants,2) Init(1)
535 Attempt to merge identical constants and constant variables
538 Common Report Var(flag_merge_constants,1) VarExists
539 Attempt to merge identical constants across compilation units
542 Common RejectNegative Joined UInteger
543 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
546 Common Report Var(flag_modulo_sched)
547 Perform SMS based modulo scheduling before the first scheduling pass
549 fmove-loop-invariants
550 Common Report Var(flag_move_loop_invariants)
551 Move loop invariant computations out of loops
554 Common RejectNegative Report Var(flag_mudflap)
555 Add mudflap bounds-checking instrumentation for single-threaded program
558 Common RejectNegative Report Var(flag_mudflap_threads)
559 Add mudflap bounds-checking instrumentation for multi-threaded program
562 Common RejectNegative Report Var(flag_mudflap_ignore_reads)
563 Ignore read operations when inserting mudflap instrumentation
565 freschedule-modulo-scheduled-loops
566 Common Report Var(flag_resched_modulo_sched)
567 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
570 Common Report Var(flag_non_call_exceptions)
571 Support synchronous non-call exceptions
574 Common Report Var(flag_omit_frame_pointer)
575 When possible do not generate stack frames
577 foptimize-register-move
578 Common Report Var(flag_regmove)
579 Do the full register move optimization pass
581 foptimize-sibling-calls
582 Common Report Var(flag_optimize_sibling_calls)
583 Optimize sibling and tail recursive calls
586 Common Report Var(flag_pack_struct)
587 Pack structure members together without holes
590 Common RejectNegative Joined UInteger
591 -fpack-struct=<number> Set initial maximum structure member alignment
594 Common Report Var(flag_pcc_struct_return,1) VarExists
595 Return small aggregates in memory, not registers
598 Common Report Var(flag_peel_loops)
602 Common Report Var(flag_no_peephole,0)
603 Enable machine specific peephole optimizations
606 Common Report Var(flag_peephole2)
607 Enable an RTL peephole pass before sched2
610 Common Report Var(flag_pic,2)
611 Generate position-independent code if possible (large mode)
614 Common Report Var(flag_pie,2)
615 Generate position-independent code for executables if possible (large mode)
618 Common Report Var(flag_pic,1) VarExists
619 Generate position-independent code if possible (small mode)
622 Common Report Var(flag_pie,1) VarExists
623 Generate position-independent code for executables if possible (small mode)
625 fprefetch-loop-arrays
626 Common Report Var(flag_prefetch_loop_arrays)
627 Generate prefetch instructions, if available, for arrays in loops
630 Common Report Var(profile_flag)
631 Enable basic program profiling code
634 Common Report Var(profile_arc_flag)
635 Insert arc-based program profiling code
639 Enable common options for generating profile info for profile feedback directed optimizations
643 Enable common options for performing profile feedback directed optimizations
646 Common Report Var(flag_profile_values)
647 Insert code to profile values of expressions
653 Common Joined RejectNegative
654 -frandom-seed=<string> Make compile reproducible using <string>
657 Common Report Var(flag_pcc_struct_return,0) VarExists
658 Return small aggregates in registers
661 Common Report Var(flag_regmove)
662 Enables a register move optimization
665 Common Report Var(flag_rename_registers)
666 Perform a register renaming optimization pass
669 Common Report Var(flag_reorder_blocks)
670 Reorder basic blocks to improve code placement
672 freorder-blocks-and-partition
673 Common Report Var(flag_reorder_blocks_and_partition)
674 Reorder basic blocks and partition into hot and cold sections
677 Common Report Var(flag_reorder_functions)
678 Reorder functions to improve code placement
680 frerun-cse-after-loop
681 Common Report Var(flag_rerun_cse_after_loop)
682 Add a common subexpression elimination pass after loop optimizations
685 Common Report Var(flag_rerun_loop_opt)
686 Run the loop optimizer twice
689 Common Report Var(flag_rounding_math)
690 Disable optimizations that assume default FP rounding behavior
693 Common Report Var(flag_schedule_interblock) Init(1)
694 Enable scheduling across basic blocks
697 Common Report Var(flag_schedule_speculative) Init(1)
698 Allow speculative motion of non-loads
701 Common Report Var(flag_schedule_speculative_load)
702 Allow speculative motion of some loads
704 fsched-spec-load-dangerous
705 Common Report Var(flag_schedule_speculative_load_dangerous)
706 Allow speculative motion of more loads
709 Common RejectNegative Joined
710 -fsched-verbose=<number> Set the verbosity level of the scheduler
712 fsched2-use-superblocks
713 Common Report Var(flag_sched2_use_superblocks)
714 If scheduling post reload, do superblock scheduling
717 Common Report Var(flag_sched2_use_traces)
718 If scheduling post reload, do trace scheduling
721 Common Report Var(flag_schedule_insns)
722 Reschedule instructions before register allocation
725 Common Report Var(flag_schedule_insns_after_reload)
726 Reschedule instructions after register allocation
728 ; sched_stalled_insns means that insns can be moved prematurely from the queue
729 ; of stalled insns into the ready list.
731 Common Report Var(flag_sched_stalled_insns)
732 Allow premature scheduling of queued insns
734 fsched-stalled-insns=
735 Common RejectNegative Joined UInteger
736 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
738 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
739 ; be examined for a dependency on a stalled insn that is candidate for
740 ; premature removal from the queue of stalled insns into the ready list (has
741 ; an effect only if the flag 'sched_stalled_insns' is set).
742 fsched-stalled-insns-dep
743 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1)
744 Set dependence distance checking in premature scheduling of queued insns
746 fsched-stalled-insns-dep=
747 Common RejectNegative Joined UInteger
748 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
751 Common Report Var(flag_shared_data)
752 Mark data as shared rather than private
755 Common C ObjC C++ ObjC++ Report Var(flag_show_column) Init(1)
756 Show column numbers in diagnostics, when available. Default on
759 Common Report Var(flag_signaling_nans)
760 Disable optimizations observable by IEEE signaling NaNs
762 fsingle-precision-constant
763 Common Report Var(flag_single_precision_constant)
764 Convert floating point constants to single precision constants
766 fspeculative-prefetching
767 Common Report Var(flag_speculative_prefetching)
768 Use value profiling for speculative prefetching
770 fsplit-ivs-in-unroller
771 Common Report Var(flag_split_ivs_in_unroller) Init(1)
772 Split lifetimes of induction variables when loops are unrolled
774 fvariable-expansion-in-unroller
775 Common Report Var(flag_variable_expansion_in_unroller)
776 Apply variable expansion when loops are unrolled
778 ; Emit code to probe the stack, to help detect stack overflow; also
779 ; may cause large objects to be allocated dynamically.
781 Common Report Var(flag_stack_check)
782 Insert stack checking code into the program
787 fstack-limit-register=
788 Common RejectNegative Joined
789 -fstack-limit-register=<register> Trap if the stack goes past <register>
792 Common RejectNegative Joined
793 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
796 Common Report Var(flag_stack_protect, 1)
797 Use propolice as a stack protection method
800 Common Report RejectNegative Var(flag_stack_protect, 2) VarExists
801 Use a stack protection method for every function
804 Common Report Var(flag_strength_reduce)
805 Perform strength reduction optimizations
807 ; Nonzero if we should do (language-dependent) alias analysis.
808 ; Typically, this analysis will assume that expressions of certain
809 ; types do not alias expressions of certain other types. Only used
810 ; if alias analysis (in general) is enabled.
812 Common Report Var(flag_strict_aliasing)
813 Assume strict aliasing rules apply
816 Common Report Var(flag_syntax_only)
817 Check for syntax errors, then stop
820 Common Report Var(flag_test_coverage)
821 Create data files needed by \"gcov\"
824 Common Report Var(flag_thread_jumps)
825 Perform jump threading optimizations
828 Common Report Var(time_report)
829 Report the time taken by each compiler pass
832 Common Joined RejectNegative
833 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
836 Common Report Var(flag_tracer)
837 Perform superblock formation via tail duplication
839 ; Zero means that floating-point math operations cannot generate a
840 ; (user-visible) trap. This is the case, for example, in nonstop
841 ; IEEE 754 arithmetic.
843 Common Report Var(flag_trapping_math) Init(1)
844 Assume floating-point operations can trap
847 Common Report Var(flag_trapv)
848 Trap for signed overflow in addition, subtraction and multiplication
850 ftree-based-profiling
851 Common Report Var(flag_tree_based_profiling)
852 Use tree-ssa based implementation of profiling
855 Common Report Var(flag_tree_ccp)
856 Enable SSA-CCP optimization on trees
859 Common Report Var(flag_tree_store_ccp)
860 Enable SSA-CCP optimization for stores and loads
863 Common Report Var(flag_tree_ch)
864 Enable loop header copying on trees
867 Common Report Var(flag_tree_combine_temps)
868 Coalesce memory temporaries in the SSA->normal pass
871 Common Report Var(flag_tree_copyrename)
872 Replace SSA temporaries with better names in copies
875 Common Report Var(flag_tree_copy_prop)
876 Enable copy propagation on trees
878 ftree-store-copy-prop
879 Common Report Var(flag_tree_store_copy_prop)
880 Enable copy propagation for stores and loads
883 Common Report Var(flag_tree_dce)
884 Enable SSA dead code elimination optimization on trees
887 Common Report Var(flag_tree_dom)
888 Enable dominator optimizations
891 Common Report Var(flag_tree_dse)
892 Enable dead store elimination
895 Common Report Var(flag_tree_fre)
896 Enable Full Redundancy Elimination (FRE) on trees
899 Common Report Var(flag_tree_loop_im) Init(1)
900 Enable loop invariant motion on trees
903 Common Report Var(flag_tree_loop_linear)
904 Enable linear loop transforms on trees
907 Common Report Var(flag_tree_loop_ivcanon) Init(1)
908 Create canonical induction variables in loops
911 Common Report Var(flag_tree_loop_optimize) Init(1)
912 Enable loop optimizations on tree level
915 Common Report Var(flag_tree_pre)
916 Enable SSA-PRE optimization on trees
919 Common Report Var(flag_tree_salias)
920 Perform structural alias analysis
923 Common Report Var(flag_tree_sink)
924 Enable SSA code sinking on trees
927 Common Report Var(flag_tree_sra)
928 Perform scalar replacement of aggregates
931 Common Report Var(flag_tree_ter)
932 Replace temporary expressions in the SSA->normal pass
935 Common Report Var(flag_tree_live_range_split)
936 Perform live range splitting during the SSA->normal pass
939 Common Report Var(flag_tree_vrp) Init(0)
940 Perform Value Range Propagation on trees
943 Common Report Var(flag_unit_at_a_time)
944 Compile whole compilation unit at a time
947 Common Report Var(flag_unroll_loops)
948 Perform loop unrolling when iteration count is known
951 Common Report Var(flag_unroll_all_loops)
952 Perform loop unrolling for all loops
954 ; Nonzero means that unsafe floating-point math optimizations are allowed
955 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
956 ; are allowed to assume that their arguments and results are "normal"
957 ; (e.g., nonnegative for SQRT).
958 funsafe-math-optimizations
959 Common Report Var(flag_unsafe_math_optimizations)
960 Allow math optimizations that may violate IEEE or ISO standards
963 Common Report Var(flag_unswitch_loops)
964 Perform loop unswitching
967 Common Report Var(flag_unwind_tables)
968 Just generate unwind tables for exception handling
971 Common Report Var(flag_var_tracking) VarExists
972 Perform variable tracking
975 Common Report Var(flag_tree_vectorize)
976 Enable loop vectorization on trees
978 ftree-vectorizer-verbose=
979 Common RejectNegative Joined
980 -ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
982 ; -fverbose-asm causes extra commentary information to be produced in
983 ; the generated assembly code (to make it more readable). This option
984 ; is generally only of use to those who actually need to read the
985 ; generated assembly code (perhaps while debugging the compiler itself).
986 ; -fno-verbose-asm, the default, causes the extra information
987 ; to not be added and is useful when comparing two assembler files.
989 Common Report Var(flag_verbose_asm)
990 Add extra commentary to assembler output
993 Common Joined RejectNegative
994 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
998 Common Report Var(flag_value_profile_transformations)
999 Use expression value profiles in optimizations
1002 Common Report Var(flag_web) Init(0)
1003 Construct webs and split unrelated uses of single variable
1006 Common Report Var(flag_whole_program) Init(0)
1007 Perform whole program optimizations
1010 Common Report Var(flag_wrapv)
1011 Assume signed arithmetic overflow wraps around
1013 fzero-initialized-in-bss
1014 Common Report Var(flag_zero_initialized_in_bss) Init(1)
1015 Put zero initialized data in the bss section
1018 Common JoinedOrMissing
1019 Generate debug information in default format
1022 Common JoinedOrMissing
1023 Generate debug information in COFF format
1026 Common JoinedOrMissing
1027 Generate debug information in DWARF v2 format
1030 Common JoinedOrMissing
1031 Generate debug information in default extended format
1034 Common JoinedOrMissing
1035 Generate debug information in STABS format
1038 Common JoinedOrMissing
1039 Generate debug information in extended STABS format
1042 Common JoinedOrMissing
1043 Generate debug information in VMS format
1046 Common JoinedOrMissing
1047 Generate debug information in XCOFF format
1050 Common JoinedOrMissing
1051 Generate debug information in extended XCOFF format
1054 Common Joined Separate
1055 -o <file> Place output into <file>
1058 Common Var(profile_flag)
1059 Enable function profiling
1062 Common Var(pedantic)
1063 Issue warnings needed for strict compliance to the standard
1067 Like -pedantic but issue them as errors
1070 Common Var(quiet_flag)
1071 Do not display functions compiled or elapsed time
1074 Common Var(version_flag)
1075 Display the compiler's version
1078 Common Var(inhibit_warnings)
1081 ; This comment is to ensure we retain the blank line above.