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, 59 Temple Place - Suite 330, 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_cast_align)
62 Warn about pointer casts which increase alignment
64 Wdeprecated-declarations
65 Common Var(warn_deprecated_decl) Init(1)
66 Warn about uses of __attribute__((deprecated)) declarations
68 Wdisabled-optimization
69 Common Var(warn_disabled_optimization)
70 Warn when an optimization pass is disabled
73 Common Var(warnings_are_errors)
74 Treat all warnings as errors
78 Print extra (possibly unwanted) warnings
81 Common Var(flag_fatal_errors)
82 Exit on the first error occurred
85 Common Var(warn_inline)
86 Warn when an inlined function cannot be inlined
89 Common RejectNegative Joined UInteger
90 -Wlarger-than-<number> Warn if an object is larger than <number> bytes
93 Common Var(warn_missing_noreturn)
94 Warn about functions which might be candidates for __attribute__((noreturn))
97 Common Var(warn_packed)
98 Warn when the packed attribute has no effect on struct layout
101 Common Var(warn_padded)
102 Warn when padding is required to align structure members
105 Common Var(warn_shadow)
106 Warn when one local variable shadows another
110 Warn about code which might break strict aliasing rules
113 Common Joined UInteger
114 Warn about code which might break strict aliasing rules
117 Common Var(warn_switch)
118 Warn about enumerated switches, with no default, missing a case
121 Common Var(warn_switch_default)
122 Warn about enumerated switches missing a \"default:\" statement
125 Common Var(warn_switch_enum)
126 Warn about all enumerated switches missing a specific case
129 Common Var(warn_system_headers)
130 Do not suppress warnings from system headers
133 Common Var(warn_uninitialized)
134 Warn about uninitialized automatic variables
137 Common Var(warn_notreached)
138 Warn about code that will never be executed
142 Enable all -Wunused- warnings
145 Common Var(warn_unused_function)
146 Warn when a function is unused
149 Common Var(warn_unused_label)
150 Warn when a label is unused
153 Common Var(warn_unused_parameter)
154 Warn when a function parameter is unused
157 Common Var(warn_unused_value)
158 Warn when an expression value is unused
161 Common Var(warn_unused_variable)
162 Warn when a variable is unused
166 -aux-info <file> Emit declaration information into <file>
179 -d<letters> Enable dumps from specific passes of the compiler
183 -dumpbase <file> Set the file basename to be used for dumps
185 ; The version of the C++ ABI in use. The following values are allowed:
187 ; 0: The version of the ABI believed most conformant with the C++ ABI
188 ; specification. This ABI may change as bugs are discovered and fixed.
189 ; Therefore, 0 will not necessarily indicate the same ABI in different
192 ; 1: The version of the ABI first used in G++ 3.2.
194 ; Additional positive integers will be assigned as new versions of
195 ; the ABI become the default version of the ABI.
197 Common Joined UInteger Var(flag_abi_version) Init(2)
200 Common Report Var(align_functions,0)
201 Align the start of functions
204 Common RejectNegative Joined UInteger
207 Common Report Var(align_jumps,0)
208 Align labels which are only reached by jumping
211 Common RejectNegative Joined UInteger
214 Common Report Var(align_labels,0)
218 Common RejectNegative Joined UInteger
221 Common Report Var(align_loops)
222 Align the start of loops
225 Common RejectNegative Joined UInteger
227 ; This flag is only tested if alias checking is enabled.
228 ; 0 if pointer arguments may alias each other. True in C.
229 ; 1 if pointer arguments may not alias each other but may alias
231 ; 2 if pointer arguments may not alias each other and may not
232 ; alias global variables. True in Fortran.
233 ; The value is ignored if flag_alias_check is 0.
235 Common Report Var(flag_argument_noalias,0)
236 Specify that arguments may alias each other and globals
239 Common Report Var(flag_argument_noalias,1) VarExists
240 Assume arguments may alias globals but not each other
242 fargument-noalias-global
243 Common Report Var(flag_argument_noalias,2) VarExists
244 Assume arguments alias neither each other nor globals
246 fasynchronous-unwind-tables
247 Common Report Var(flag_asynchronous_unwind_tables)
248 Generate unwind tables that are exact at each instruction boundary
250 ; -fcheck-bounds causes gcc to generate array bounds checks.
251 ; For C, C++ and ObjC: defaults off.
252 ; For Java: defaults to on.
253 ; For Fortran: defaults to off.
255 Common Report Var(flag_bounds_check)
256 Generate code to check bounds before indexing arrays
259 Common Report Var(flag_branch_on_count_reg) Init(1)
260 Replace add, compare, branch with branch on count register
262 fbranch-probabilities
263 Common Report Var(flag_branch_probabilities)
264 Use profiling information for branch probabilities
266 fbranch-target-load-optimize
267 Common Report Var(flag_branch_target_load_optimize)
268 Perform branch target load optimization before prologue / epilogue threading
270 fbranch-target-load-optimize2
271 Common Report Var(flag_branch_target_load_optimize2)
272 Perform branch target load optimization after prologue / epilogue threading
275 Common Report Var(flag_btr_bb_exclusive)
276 Restrict target load migration not to re-use registers in any basic block
279 Common Joined RejectNegative
280 -fcall-saved-<register> Mark <register> as being preserved across functions
283 Common Joined RejectNegative
284 -fcall-used-<register> Mark <register> as being corrupted by function calls
286 ; Nonzero for -fcaller-saves: allocate values in regs that need to
287 ; be saved across function calls, if that produces overall better code.
288 ; Optional now, so people can test it.
290 Common Report Var(flag_caller_saves)
291 Save registers around function calls
294 Common Report Var(flag_no_common,0)
295 Do not put uninitialized globals in the common section
298 Common Report Var(flag_cprop_registers)
299 Perform a register copy-propagation optimization pass
302 Common Report Var(flag_crossjumping)
303 Perform cross-jumping optimization
306 Common Report Var(flag_cse_follow_jumps)
307 When running CSE, follow jumps to their targets
310 Common Report Var(flag_cse_skip_blocks)
311 When running CSE, follow conditional jumps
314 Common Report Var(flag_cx_limited_range)
315 Omit range reduction step when performing complex division
318 Common Report Var(flag_data_sections)
319 Place data items into their own section
321 ; Nonzero for -fdefer-pop: don't pop args after each function call
322 ; instead save them up to pop many calls' args with one insns.
324 Common Report Var(flag_defer_pop)
325 Defer popping functions args from stack until later
328 Common Report Var(flag_delayed_branch)
329 Attempt to fill delay slots of branch instructions
331 fdelete-null-pointer-checks
332 Common Report Var(flag_delete_null_pointer_checks)
333 Delete useless null pointer checks
335 fdiagnostics-show-location=
336 Common Joined RejectNegative
337 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
339 fdiagnostics-show-option
341 Amend appropriate diagnostic messages with the command line option that controls them.
344 Common Joined RejectNegative
345 -fdump-<type> Dump various compiler internals to a file
348 Common Report Var(flag_dump_unnumbered) VarExists
349 Suppress output of instruction numbers and line number notes in debugging dumps
351 feliminate-dwarf2-dups
352 Common Report Var(flag_eliminate_dwarf2_dups)
353 Perform DWARF2 duplicate elimination
355 feliminate-unused-debug-symbols
356 Common Report Var(flag_debug_only_used_symbols)
357 Perform unused type elimination in debug info
359 feliminate-unused-debug-types
360 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
361 Perform unused type elimination in debug info
364 Common Report Var(flag_exceptions)
365 Enable exception handling
367 fexpensive-optimizations
368 Common Report Var(flag_expensive_optimizations)
369 Perform a number of minor, expensive optimizations
375 Common Report Var(flag_finite_math_only)
376 Assume no NaNs or infinities are generated
379 Common Joined RejectNegative
380 -ffixed-<register> Mark <register> as being unavailable to the compiler
383 Common Report Var(flag_float_store)
384 Don't allocate floats and doubles in extended-precision registers
386 ; Nonzero for -fforce-addr: load memory address into a register before
387 ; reference to memory. This makes better cse but slower compilation.
389 Common Report Var(flag_force_addr)
390 Copy memory address constants into registers before use
392 ; Nonzero for -fforce-mem: load memory value into a register
393 ; before arithmetic on it. This makes better cse but slower compilation.
395 Common Report Var(flag_force_mem)
396 Copy memory operands into registers before use
398 ; Nonzero means don't put addresses of constant functions in registers.
399 ; Used for compiling the Unix kernel, where strange substitutions are
400 ; done on the assembly output.
402 Common Report Var(flag_no_function_cse,0)
403 Allow function addresses to be held in registers
406 Common Report Var(flag_function_sections)
407 Place each function into its own section
410 Common Report Var(flag_gcse)
411 Perform global common subexpression elimination
414 Common Report Var(flag_gcse_lm) Init(1)
415 Perform enhanced load motion during global common subexpression elimination
418 Common Report Var(flag_gcse_sm) Init(0)
419 Perform store motion after global common subexpression elimination
422 Common Report Var(flag_gcse_las) Init(0)
423 Perform redundant load after store elimination in global common subexpression
427 Common Report Var(flag_gcse_after_reload)
428 Perform global common subexpression elimination after register allocation
431 fguess-branch-probability
432 Common Report Var(flag_guess_branch_prob)
433 Enable guessing of branch probabilities
435 ; Nonzero means ignore `#ident' directives. 0 means handle them.
436 ; Generate position-independent code for executables if possible
437 ; On SVR4 targets, it also controls whether or not to emit a
438 ; string identifying the compiler.
440 Common Report Var(flag_no_ident,0)
441 Process #ident directives
444 Common Report Var(flag_if_conversion)
445 Perform conversion of conditional jumps to branchless equivalents
448 Common Report Var(flag_if_conversion2)
449 Perform conversion of conditional jumps to conditional execution
451 ; -finhibit-size-directive inhibits output of .size for ELF.
452 ; This is used only for compiling crtstuff.c,
453 ; and it may be extended to other effects
454 ; needed for crtstuff.c on other systems.
455 finhibit-size-directive
456 Common Report Var(flag_inhibit_size_directive)
457 Do not generate .size directives
459 ; Nonzero means that functions declared `inline' will be treated
460 ; as `static'. Prevents generation of zillions of copies of unused
461 ; static inline functions; instead, `inlines' are written out
462 ; only when actually used. Used in conjunction with -g. Also
463 ; does the right thing with #pragma interface.
465 Common Report Var(flag_no_inline,0) Init(2)
466 Pay attention to the \"inline\" keyword
469 Common Report Var(flag_inline_functions)
470 Integrate simple functions into their callers
473 Common RejectNegative Joined UInteger
476 Common RejectNegative Joined UInteger
477 -finline-limit=<number> Limit the size of inlined functions to <number>
479 finstrument-functions
480 Common Report Var(flag_instrument_function_entry_exit)
481 Instrument function entry and exit with profiling calls
484 Common Report Var(flag_ivopts) Init(1)
485 Optimize induction variables on trees
487 fkeep-inline-functions
488 Common Report Var(flag_keep_inline_functions)
489 Generate code for functions even if they are fully inlined
492 Common Report Var(flag_keep_static_consts) Init(1)
493 Emit static const variables even if they are not used
496 Common Report Var(flag_leading_underscore) Init(-1)
497 Give external symbols a leading underscore
500 Common Report Var(flag_loop_optimize)
501 Perform loop optimizations
504 Common Report Var(flag_loop_optimize2)
505 Perform loop optimizations using the new loop optimizer
508 Common Report Var(flag_errno_math) Init(1)
509 Set errno after built-in math functions
512 Common Report Var(mem_report)
513 Report on permanent memory allocation
515 ; This will attempt to merge constant section constants, if 1 only
516 ; string constants and constants from constant pool, if 2 also constant
519 Common Report Var(flag_merge_constants,2) Init(1)
520 Attempt to merge identical constants and constant variables
523 Common Report Var(flag_merge_constants,1) VarExists
524 Attempt to merge identical constants across compilation units
527 Common RejectNegative Joined UInteger
528 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
531 Common Report Var(flag_modulo_sched)
532 Perform SMS based modulo scheduling before the first scheduling pass
534 fmove-loop-invariants
535 Common Report Var(flag_move_loop_invariants)
536 Move loop invariant computations out of loops
539 Common RejectNegative Report Var(flag_mudflap)
540 Add mudflap bounds-checking instrumentation for single-threaded program.
543 Common RejectNegative Report Var(flag_mudflap_threads)
544 Add mudflap bounds-checking instrumentation for multi-threaded program.
547 Common RejectNegative Report Var(flag_mudflap_ignore_reads)
548 Ignore read operations when inserting mudflap instrumentation.
550 freschedule-modulo-scheduled-loops
551 Common Report Var(flag_resched_modulo_sched)
552 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
555 Common Report Var(flag_non_call_exceptions)
556 Support synchronous non-call exceptions
559 Common Report Var(flag_omit_frame_pointer)
560 When possible do not generate stack frames
562 foptimize-register-move
563 Common Report Var(flag_regmove)
564 Do the full register move optimization pass
566 foptimize-sibling-calls
567 Common Report Var(flag_optimize_sibling_calls)
568 Optimize sibling and tail recursive calls
571 Common Report Var(flag_pack_struct)
572 Pack structure members together without holes
575 Common RejectNegative Joined UInteger
576 -fpack-struct=<number> Set initial maximum structure member alignment
579 Common Report Var(flag_pcc_struct_return,1) VarExists
580 Return small aggregates in memory, not registers
583 Common Report Var(flag_peel_loops)
587 Common Report Var(flag_no_peephole,0)
588 Enable machine specific peephole optimizations
591 Common Report Var(flag_peephole2)
592 Enable an RTL peephole pass before sched2
595 Common Report Var(flag_pic,2)
596 Generate position-independent code if possible (large mode)
599 Common Report Var(flag_pie,2)
600 Generate position-independent code for executables if possible (large mode)
603 Common Report Var(flag_pic,1) VarExists
604 Generate position-independent code if possible (small mode)
607 Common Report Var(flag_pie,1) VarExists
608 Generate position-independent code for executables if possible (small mode)
610 fprefetch-loop-arrays
611 Common Report Var(flag_prefetch_loop_arrays)
612 Generate prefetch instructions, if available, for arrays in loops
615 Common Report Var(profile_flag)
616 Enable basic program profiling code
619 Common Report Var(profile_arc_flag)
620 Insert arc-based program profiling code
624 Enable common options for generating profile info for profile feedback directed optimizations
628 Enable common options for performing profile feedback directed optimizations
631 Common Report Var(flag_profile_values)
632 Insert code to profile values of expressions
638 Common Joined RejectNegative
639 -frandom-seed=<string> Make compile reproducible using <string>
642 Common Report Var(flag_pcc_struct_return,0) VarExists
643 Return small aggregates in registers
646 Common Report Var(flag_regmove)
647 Enables a register move optimization
650 Common Report Var(flag_rename_registers)
651 Perform a register renaming optimization pass
654 Common Report Var(flag_reorder_blocks)
655 Reorder basic blocks to improve code placement
657 freorder-blocks-and-partition
658 Common Report Var(flag_reorder_blocks_and_partition)
659 Reorder basic blocks and partition into hot and cold sections
662 Common Report Var(flag_reorder_functions)
663 Reorder functions to improve code placement
665 frerun-cse-after-loop
666 Common Report Var(flag_rerun_cse_after_loop)
667 Add a common subexpression elimination pass after loop optimizations
670 Common Report Var(flag_rerun_loop_opt)
671 Run the loop optimizer twice
674 Common Report Var(flag_rounding_math)
675 Disable optimizations that assume default FP rounding behavior
678 Common Report Var(flag_schedule_interblock) Init(1)
679 Enable scheduling across basic blocks
682 Common Report Var(flag_schedule_speculative) Init(1)
683 Allow speculative motion of non-loads
686 Common Report Var(flag_schedule_speculative_load)
687 Allow speculative motion of some loads
689 fsched-spec-load-dangerous
690 Common Report Var(flag_schedule_speculative_load_dangerous)
691 Allow speculative motion of more loads
694 Common RejectNegative Joined
695 -fsched-verbose=<number> Set the verbosity level of the scheduler
697 fsched2-use-superblocks
698 Common Report Var(flag_sched2_use_superblocks)
699 If scheduling post reload, do superblock scheduling
702 Common Report Var(flag_sched2_use_traces)
703 If scheduling post reload, do trace scheduling
706 Common Report Var(flag_schedule_insns)
707 Reschedule instructions before register allocation
710 Common Report Var(flag_schedule_insns_after_reload)
711 Reschedule instructions after register allocation
713 ; sched_stalled_insns means that insns can be moved prematurely from the queue
714 ; of stalled insns into the ready list.
716 Common Report Var(flag_sched_stalled_insns)
717 Allow premature scheduling of queued insns
719 fsched-stalled-insns=
720 Common RejectNegative Joined UInteger
721 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
723 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
724 ; be examined for a dependency on a stalled insn that is candidate for
725 ; premature removal from the queue of stalled insns into the ready list (has
726 ; an effect only if the flag 'sched_stalled_insns' is set).
727 fsched-stalled-insns-dep
728 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1)
729 Set dependence distance checking in premature scheduling of queued insns
731 fsched-stalled-insns-dep=
732 Common RejectNegative Joined UInteger
733 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
736 Common Report Var(flag_shared_data)
737 Mark data as shared rather than private
740 Common C ObjC C++ ObjC++ Report Var(flag_show_column) Init(1)
741 Show column numbers in diagnostics, when available. Default on.
744 Common Report Var(flag_signaling_nans)
745 Disable optimizations observable by IEEE signaling NaNs
747 fsingle-precision-constant
748 Common Report Var(flag_single_precision_constant)
749 Convert floating point constants to single precision constants
751 fspeculative-prefetching
752 Common Report Var(flag_speculative_prefetching)
753 Use value profiling for speculative prefetching
755 fsplit-ivs-in-unroller
756 Common Report Var(flag_split_ivs_in_unroller) Init(1)
757 Split lifetimes of induction variables when loops are unrolled.
759 fvariable-expansion-in-unroller
760 Common Report Var(flag_variable_expansion_in_unroller)
761 Apply variable expansion when loops are unrolled.
763 ; Emit code to probe the stack, to help detect stack overflow; also
764 ; may cause large objects to be allocated dynamically.
766 Common Report Var(flag_stack_check)
767 Insert stack checking code into the program
772 fstack-limit-register=
773 Common RejectNegative Joined
774 -fstack-limit-register=<register> Trap if the stack goes past <register>
777 Common RejectNegative Joined
778 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
781 Common Report Var(flag_strength_reduce)
782 Perform strength reduction optimizations
784 ; Nonzero if we should do (language-dependent) alias analysis.
785 ; Typically, this analysis will assume that expressions of certain
786 ; types do not alias expressions of certain other types. Only used
787 ; if alias analysis (in general) is enabled.
789 Common Report Var(flag_strict_aliasing)
790 Assume strict aliasing rules apply
793 Common Report Var(flag_syntax_only)
794 Check for syntax errors, then stop
797 Common Report Var(flag_test_coverage)
798 Create data files needed by \"gcov\"
801 Common Report Var(flag_thread_jumps)
802 Perform jump threading optimizations
805 Common Report Var(time_report)
806 Report the time taken by each compiler pass
809 Common Joined RejectNegative
810 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
813 Common Report Var(flag_tracer)
814 Perform superblock formation via tail duplication
816 ; Zero means that floating-point math operations cannot generate a
817 ; (user-visible) trap. This is the case, for example, in nonstop
818 ; IEEE 754 arithmetic.
820 Common Report Var(flag_trapping_math) Init(1)
821 Assume floating-point operations can trap
824 Common Report Var(flag_trapv)
825 Trap for signed overflow in addition, subtraction and multiplication
827 ftree-based-profiling
828 Common Report Var(flag_tree_based_profiling)
829 Use tree-ssa based implementation of profiling
832 Common Report Var(flag_tree_ccp)
833 Enable SSA-CCP optimization on trees
836 Common Report Var(flag_tree_store_ccp)
837 Enable SSA-CCP optimization for stores and loads
840 Common Report Var(flag_tree_ch)
841 Enable loop header copying on trees
844 Common Report Var(flag_tree_combine_temps)
845 Coalesce memory temporaries in the SSA->normal pass
848 Common Report Var(flag_tree_copyrename)
849 Replace SSA temporaries with better names in copies.
852 Common Report Var(flag_tree_copy_prop)
853 Enable copy propagation on trees
855 ftree-store-copy-prop
856 Common Report Var(flag_tree_store_copy_prop)
857 Enable copy propagation for stores and loads
860 Common Report Var(flag_tree_dce)
861 Enable SSA dead code elimination optimization on trees
864 Common Report Var(flag_tree_dom)
865 Enable dominator optimizations
868 Common Report Var(flag_tree_dse)
869 Enable dead store elimination
872 Common Report Var(flag_tree_fre)
873 Enable Full Redundancy Elimination (FRE) on trees
876 Common Report Var(flag_tree_loop_im) Init(1)
877 Enable loop invariant motion on trees
880 Common Report Var(flag_tree_loop_linear)
881 Enable linear loop transforms on trees
884 Common Report Var(flag_tree_loop_ivcanon) Init(1)
885 Create canonical induction variables in loops
888 Common Report Var(flag_tree_loop_optimize) Init(1)
889 Enable loop optimizations on tree level
892 Common Report Var(flag_tree_pre)
893 Enable SSA-PRE optimization on trees
896 Common Report Var(flag_tree_salias)
897 Perform structural alias analysis
900 Common Report Var(flag_tree_sink)
901 Enable SSA code sinking on trees
904 Common Report Var(flag_tree_sra)
905 Perform scalar replacement of aggregates
908 Common Report Var(flag_tree_ter)
909 Replace temporary expressions in the SSA->normal pass
912 Common Report Var(flag_tree_live_range_split)
913 Perform live range splitting during the SSA->normal pass.
916 Common Report Var(flag_tree_vrp) Init(0)
917 Perform Value Range Propagation on trees
920 Common Report Var(flag_unit_at_a_time)
921 Compile whole compilation unit at a time
924 Common Report Var(flag_unroll_loops)
925 Perform loop unrolling when iteration count is known
928 Common Report Var(flag_unroll_all_loops)
929 Perform loop unrolling for all loops
931 ; Nonzero means that unsafe floating-point math optimizations are allowed
932 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
933 ; are allowed to assume that their arguments and results are "normal"
934 ; (e.g., nonnegative for SQRT).
935 funsafe-math-optimizations
936 Common Report Var(flag_unsafe_math_optimizations)
937 Allow math optimizations that may violate IEEE or ISO standards
940 Common Report Var(flag_unswitch_loops)
941 Perform loop unswitching
944 Common Report Var(flag_unwind_tables)
945 Just generate unwind tables for exception handling
948 Common Report Var(flag_var_tracking) VarExists
949 Perform variable tracking
952 Common Report Var(flag_tree_vectorize)
953 Enable loop vectorization on trees
955 ftree-vectorizer-verbose=
956 Common RejectNegative Joined
957 -ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
959 ; -fverbose-asm causes extra commentary information to be produced in
960 ; the generated assembly code (to make it more readable). This option
961 ; is generally only of use to those who actually need to read the
962 ; generated assembly code (perhaps while debugging the compiler itself).
963 ; -fno-verbose-asm, the default, causes the extra information
964 ; to not be added and is useful when comparing two assembler files.
966 Common Report Var(flag_verbose_asm)
967 Add extra commentary to assembler output
970 Common Joined RejectNegative
971 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
975 Common Report Var(flag_value_profile_transformations)
976 Use expression value profiles in optimizations
979 Common Report Var(flag_web) Init(0)
980 Construct webs and split unrelated uses of single variable
983 Common Report Var(flag_wrapv)
984 Assume signed arithmetic overflow wraps around
986 fzero-initialized-in-bss
987 Common Report Var(flag_zero_initialized_in_bss) Init(1)
988 Put zero initialized data in the bss section
991 Common JoinedOrMissing
992 Generate debug information in default format
995 Common JoinedOrMissing
996 Generate debug information in COFF format
999 Common JoinedOrMissing
1000 Generate debug information in DWARF v2 format
1003 Common JoinedOrMissing
1004 Generate debug information in default extended format
1007 Common JoinedOrMissing
1008 Generate debug information in STABS format
1011 Common JoinedOrMissing
1012 Generate debug information in extended STABS format
1015 Common JoinedOrMissing
1016 Generate debug information in VMS format
1019 Common JoinedOrMissing
1020 Generate debug information in XCOFF format
1023 Common JoinedOrMissing
1024 Generate debug information in extended XCOFF format
1027 Common Joined Separate
1028 -o <file> Place output into <file>
1031 Common Var(profile_flag)
1032 Enable function profiling
1035 Common Var(pedantic)
1036 Issue warnings needed for strict compliance to the standard
1040 Like -pedantic but issue them as errors
1043 Common Var(quiet_flag)
1044 Do not display functions compiled or elapsed time
1047 Common Var(version_flag)
1048 Display the compiler's version
1051 Common Var(inhibit_warnings)
1054 ; This comment is to ensure we retain the blank line above.