1 ; Options for the language- and target-independent parts of the compiler.
3 ; Copyright (C) 2003, 2004, 2005, 2006 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_always_true)
62 Warn about comparisons that always evaluate to true
65 Common Var(warn_attributes) Init(1)
66 Warn about inappropriate attribute usage
69 Common Var(warn_cast_align)
70 Warn about pointer casts which increase alignment
72 Wdeprecated-declarations
73 Common Var(warn_deprecated_decl) Init(1)
74 Warn about uses of __attribute__((deprecated)) declarations
76 Wdisabled-optimization
77 Common Var(warn_disabled_optimization)
78 Warn when an optimization pass is disabled
81 Common Var(warnings_are_errors)
82 Treat all warnings as errors
86 Treat specified warning as error
90 Print extra (possibly unwanted) warnings
93 Common Var(flag_fatal_errors)
94 Exit on the first error occurred
97 Common Var(warn_inline)
98 Warn when an inlined function cannot be inlined
101 Common RejectNegative Joined UInteger
102 -Wlarger-than-<number> Warn if an object is larger than <number> bytes
104 Wunsafe-loop-optimizations
105 Common Var(warn_unsafe_loop_optimizations)
106 Warn if the loop cannot be optimized due to nontrivial assumptions.
109 Common Var(warn_missing_noreturn)
110 Warn about functions which might be candidates for __attribute__((noreturn))
113 Common Var(warn_packed)
114 Warn when the packed attribute has no effect on struct layout
117 Common Var(warn_padded)
118 Warn when padding is required to align structure members
121 Common Var(warn_shadow)
122 Warn when one local variable shadows another
125 Common Var(warn_stack_protect)
126 Warn when not issuing stack smashing protection for some reason
130 Warn about code which might break strict aliasing rules
133 Common Joined UInteger
134 Warn about code which might break strict aliasing rules
136 Wstring-literal-comparison
137 Common Var(warn_string_literal_comparison)
138 Warn about comparisons to constant string literals
141 Common Var(warn_switch)
142 Warn about enumerated switches, with no default, missing a case
145 Common Var(warn_switch_default)
146 Warn about enumerated switches missing a \"default:\" statement
149 Common Var(warn_switch_enum)
150 Warn about all enumerated switches missing a specific case
153 Common Var(warn_system_headers)
154 Do not suppress warnings from system headers
157 Common Var(warn_uninitialized)
158 Warn about uninitialized automatic variables
161 Common Var(warn_notreached)
162 Warn about code that will never be executed
166 Enable all -Wunused- warnings
169 Common Var(warn_unused_function)
170 Warn when a function is unused
173 Common Var(warn_unused_label)
174 Warn when a label is unused
177 Common Var(warn_unused_parameter)
178 Warn when a function parameter is unused
181 Common Var(warn_unused_value)
182 Warn when an expression value is unused
185 Common Var(warn_unused_variable)
186 Warn when a variable is unused
188 Wvolatile-register-var
189 Common Var(warn_register_var)
190 Warn when a register variable is declared volatile
194 -aux-info <file> Emit declaration information into <file>
207 -d<letters> Enable dumps from specific passes of the compiler
211 -dumpbase <file> Set the file basename to be used for dumps
213 ; The version of the C++ ABI in use. The following values are allowed:
215 ; 0: The version of the ABI believed most conformant with the C++ ABI
216 ; specification. This ABI may change as bugs are discovered and fixed.
217 ; Therefore, 0 will not necessarily indicate the same ABI in different
220 ; 1: The version of the ABI first used in G++ 3.2.
222 ; Additional positive integers will be assigned as new versions of
223 ; the ABI become the default version of the ABI.
225 Common Joined UInteger Var(flag_abi_version) Init(2)
228 Common Report Var(align_functions,0)
229 Align the start of functions
232 Common RejectNegative Joined UInteger
235 Common Report Var(align_jumps,0)
236 Align labels which are only reached by jumping
239 Common RejectNegative Joined UInteger
242 Common Report Var(align_labels,0)
246 Common RejectNegative Joined UInteger
249 Common Report Var(align_loops)
250 Align the start of loops
253 Common RejectNegative Joined UInteger
255 ; This flag is only tested if alias checking is enabled.
256 ; 0 if pointer arguments may alias each other. True in C.
257 ; 1 if pointer arguments may not alias each other but may alias
259 ; 2 if pointer arguments may not alias each other and may not
260 ; alias global variables.
261 ; 3 if pointer arguments may not alias anything. True in Fortran.
262 ; Set by the front end.
264 Common Report Var(flag_argument_noalias,0)
265 Specify that arguments may alias each other and globals
268 Common Report Var(flag_argument_noalias,1) VarExists
269 Assume arguments may alias globals but not each other
271 fargument-noalias-global
272 Common Report Var(flag_argument_noalias,2) VarExists
273 Assume arguments alias neither each other nor globals
275 fargument-noalias-anything
276 Common Report Var(flag_argument_noalias,3) VarExists
277 Assume arguments alias no other storage
279 fasynchronous-unwind-tables
280 Common Report Var(flag_asynchronous_unwind_tables)
281 Generate unwind tables that are exact at each instruction boundary
283 ; -fcheck-bounds causes gcc to generate array bounds checks.
284 ; For C, C++ and ObjC: defaults off.
285 ; For Java: defaults to on.
286 ; For Fortran: defaults to off.
288 Common Report Var(flag_bounds_check)
289 Generate code to check bounds before indexing arrays
292 Common Report Var(flag_branch_on_count_reg) Init(1)
293 Replace add, compare, branch with branch on count register
295 fbranch-probabilities
296 Common Report Var(flag_branch_probabilities)
297 Use profiling information for branch probabilities
299 fbranch-target-load-optimize
300 Common Report Var(flag_branch_target_load_optimize)
301 Perform branch target load optimization before prologue / epilogue threading
303 fbranch-target-load-optimize2
304 Common Report Var(flag_branch_target_load_optimize2)
305 Perform branch target load optimization after prologue / epilogue threading
308 Common Report Var(flag_btr_bb_exclusive)
309 Restrict target load migration not to re-use registers in any basic block
312 Common Joined RejectNegative
313 -fcall-saved-<register> Mark <register> as being preserved across functions
316 Common Joined RejectNegative
317 -fcall-used-<register> Mark <register> as being corrupted by function calls
319 ; Nonzero for -fcaller-saves: allocate values in regs that need to
320 ; be saved across function calls, if that produces overall better code.
321 ; Optional now, so people can test it.
323 Common Report Var(flag_caller_saves)
324 Save registers around function calls
327 Common Report Var(flag_no_common,0)
328 Do not put uninitialized globals in the common section
331 Common Report Var(flag_cprop_registers)
332 Perform a register copy-propagation optimization pass
335 Common Report Var(flag_crossjumping)
336 Perform cross-jumping optimization
339 Common Report Var(flag_cse_follow_jumps)
340 When running CSE, follow jumps to their targets
343 Common Report Var(flag_cse_skip_blocks)
344 When running CSE, follow conditional jumps
347 Common Report Var(flag_cx_limited_range)
348 Omit range reduction step when performing complex division
351 Common Report Var(flag_data_sections)
352 Place data items into their own section
354 ; Nonzero for -fdefer-pop: don't pop args after each function call
355 ; instead save them up to pop many calls' args with one insns.
357 Common Report Var(flag_defer_pop)
358 Defer popping functions args from stack until later
361 Common Report Var(flag_delayed_branch)
362 Attempt to fill delay slots of branch instructions
364 fdelete-null-pointer-checks
365 Common Report Var(flag_delete_null_pointer_checks)
366 Delete useless null pointer checks
368 fdiagnostics-show-location=
369 Common Joined RejectNegative
370 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
372 fdiagnostics-show-option
374 Amend appropriate diagnostic messages with the command line option that controls them
377 Common Joined RejectNegative
378 -fdump-<type> Dump various compiler internals to a file
381 Common Report Var(flag_dump_unnumbered) VarExists
382 Suppress output of instruction numbers and line number notes in debugging dumps
385 Common Report Var(flag_early_inlining) Init(1)
386 Perform early inlining
388 feliminate-dwarf2-dups
389 Common Report Var(flag_eliminate_dwarf2_dups)
390 Perform DWARF2 duplicate elimination
392 feliminate-unused-debug-symbols
393 Common Report Var(flag_debug_only_used_symbols)
394 Perform unused type elimination in debug info
396 feliminate-unused-debug-types
397 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
398 Perform unused type elimination in debug info
401 Common Report Var(flag_exceptions)
402 Enable exception handling
404 fexpensive-optimizations
405 Common Report Var(flag_expensive_optimizations)
406 Perform a number of minor, expensive optimizations
412 Common Report Var(flag_finite_math_only)
413 Assume no NaNs or infinities are generated
416 Common Joined RejectNegative
417 -ffixed-<register> Mark <register> as being unavailable to the compiler
420 Common Report Var(flag_float_store)
421 Don't allocate floats and doubles in extended-precision registers
423 ; Nonzero for -fforce-addr: load memory address into a register before
424 ; reference to memory. This makes better cse but slower compilation.
426 Common Report Var(flag_force_addr)
427 Copy memory address constants into registers before use
429 ; Nonzero for -fforce-mem: load memory value into a register
430 ; before arithmetic on it. This makes better cse but slower compilation.
432 Common Report Var(flag_force_mem)
433 Copy memory operands into registers before use
435 ; Nonzero means don't put addresses of constant functions in registers.
436 ; Used for compiling the Unix kernel, where strange substitutions are
437 ; done on the assembly output.
439 Common Report Var(flag_no_function_cse,0)
440 Allow function addresses to be held in registers
443 Common Report Var(flag_function_sections)
444 Place each function into its own section
447 Common Report Var(flag_gcse)
448 Perform global common subexpression elimination
451 Common Report Var(flag_gcse_lm) Init(1)
452 Perform enhanced load motion during global common subexpression elimination
455 Common Report Var(flag_gcse_sm) Init(0)
456 Perform store motion after global common subexpression elimination
459 Common Report Var(flag_gcse_las) Init(0)
460 Perform redundant load after store elimination in global common subexpression
464 Common Report Var(flag_gcse_after_reload)
465 Perform global common subexpression elimination after register allocation
468 fguess-branch-probability
469 Common Report Var(flag_guess_branch_prob)
470 Enable guessing of branch probabilities
472 ; Nonzero means ignore `#ident' directives. 0 means handle them.
473 ; Generate position-independent code for executables if possible
474 ; On SVR4 targets, it also controls whether or not to emit a
475 ; string identifying the compiler.
477 Common Report Var(flag_no_ident,0)
478 Process #ident directives
481 Common Report Var(flag_if_conversion)
482 Perform conversion of conditional jumps to branchless equivalents
485 Common Report Var(flag_if_conversion2)
486 Perform conversion of conditional jumps to conditional execution
488 ; -finhibit-size-directive inhibits output of .size for ELF.
489 ; This is used only for compiling crtstuff.c,
490 ; and it may be extended to other effects
491 ; needed for crtstuff.c on other systems.
492 finhibit-size-directive
493 Common Report Var(flag_inhibit_size_directive)
494 Do not generate .size directives
496 ; Nonzero means that functions declared `inline' will be treated
497 ; as `static'. Prevents generation of zillions of copies of unused
498 ; static inline functions; instead, `inlines' are written out
499 ; only when actually used. Used in conjunction with -g. Also
500 ; does the right thing with #pragma interface.
502 Common Report Var(flag_no_inline,0) Init(2)
503 Pay attention to the \"inline\" keyword
506 Common Report Var(flag_inline_functions)
507 Integrate simple functions into their callers
509 finline-functions-called-once
510 Common Report Var(flag_inline_functions_called_once) Init(1)
511 Integrate functions called once into their callers
514 Common RejectNegative Joined UInteger
517 Common RejectNegative Joined UInteger
518 -finline-limit=<number> Limit the size of inlined functions to <number>
520 finstrument-functions
521 Common Report Var(flag_instrument_function_entry_exit)
522 Instrument function entry and exit with profiling calls
525 Common Report Var(flag_ipa_cp)
526 Perform Interprocedural constant propagation
529 Common Report Var(flag_ipa_pure_const) Init(0)
530 Discover pure and const functions
533 Common Report Var(flag_ipa_pta) Init(0)
534 Perform interprocedural points-to analysis
537 Common Report Var(flag_ipa_reference) Init(0)
538 Discover readonly and non addressable static variables
541 Common Report Var(flag_ipa_type_escape) Init(0)
542 Type based escape and alias analysis
545 Common Report Var(flag_ivopts) Init(1)
546 Optimize induction variables on trees
549 Common Var(flag_jump_tables) Init(1)
550 Use jump tables for sufficiently large switch statements
552 fkeep-inline-functions
553 Common Report Var(flag_keep_inline_functions)
554 Generate code for functions even if they are fully inlined
557 Common Report Var(flag_keep_static_consts) Init(1)
558 Emit static const variables even if they are not used
561 Common Report Var(flag_leading_underscore) Init(-1)
562 Give external symbols a leading underscore
566 Does nothing. Preserved for backward compatibility.
569 Common Report Var(flag_errno_math) Init(1)
570 Set errno after built-in math functions
573 Common Report Var(mem_report)
574 Report on permanent memory allocation
576 ; This will attempt to merge constant section constants, if 1 only
577 ; string constants and constants from constant pool, if 2 also constant
580 Common Report Var(flag_merge_constants,2) Init(1)
581 Attempt to merge identical constants and constant variables
584 Common Report Var(flag_merge_constants,1) VarExists
585 Attempt to merge identical constants across compilation units
588 Common RejectNegative Joined UInteger
589 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
592 Common Report Var(flag_modulo_sched)
593 Perform SMS based modulo scheduling before the first scheduling pass
595 fmove-loop-invariants
596 Common Report Var(flag_move_loop_invariants) Init(1)
597 Move loop invariant computations out of loops
600 Common RejectNegative Report Var(flag_mudflap)
601 Add mudflap bounds-checking instrumentation for single-threaded program
604 Common RejectNegative Report Var(flag_mudflap_threads)
605 Add mudflap bounds-checking instrumentation for multi-threaded program
608 Common RejectNegative Report Var(flag_mudflap_ignore_reads)
609 Ignore read operations when inserting mudflap instrumentation
611 freschedule-modulo-scheduled-loops
612 Common Report Var(flag_resched_modulo_sched)
613 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
616 Common Report Var(flag_non_call_exceptions)
617 Support synchronous non-call exceptions
620 Common Report Var(flag_omit_frame_pointer)
621 When possible do not generate stack frames
623 foptimize-register-move
624 Common Report Var(flag_regmove)
625 Do the full register move optimization pass
627 foptimize-sibling-calls
628 Common Report Var(flag_optimize_sibling_calls)
629 Optimize sibling and tail recursive calls
632 Common Report Var(flag_pack_struct)
633 Pack structure members together without holes
636 Common RejectNegative Joined UInteger
637 -fpack-struct=<number> Set initial maximum structure member alignment
640 Common Report Var(flag_pcc_struct_return,1) VarExists
641 Return small aggregates in memory, not registers
644 Common Report Var(flag_peel_loops)
648 Common Report Var(flag_no_peephole,0)
649 Enable machine specific peephole optimizations
652 Common Report Var(flag_peephole2)
653 Enable an RTL peephole pass before sched2
656 Common Report Var(flag_pic,2)
657 Generate position-independent code if possible (large mode)
660 Common Report Var(flag_pie,2)
661 Generate position-independent code for executables if possible (large mode)
664 Common Report Var(flag_pic,1) VarExists
665 Generate position-independent code if possible (small mode)
668 Common Report Var(flag_pie,1) VarExists
669 Generate position-independent code for executables if possible (small mode)
671 fprefetch-loop-arrays
672 Common Report Var(flag_prefetch_loop_arrays)
673 Generate prefetch instructions, if available, for arrays in loops
676 Common Report Var(profile_flag)
677 Enable basic program profiling code
680 Common Report Var(profile_arc_flag)
681 Insert arc-based program profiling code
685 Enable common options for generating profile info for profile feedback directed optimizations
689 Enable common options for performing profile feedback directed optimizations
692 Common Report Var(flag_profile_values)
693 Insert code to profile values of expressions
699 Common Joined RejectNegative
700 -frandom-seed=<string> Make compile reproducible using <string>
703 Common Report Var(flag_pcc_struct_return,0) VarExists
704 Return small aggregates in registers
707 Common Report Var(flag_regmove)
708 Enables a register move optimization
711 Common Report Var(flag_rename_registers) Init(2)
712 Perform a register renaming optimization pass
715 Common Report Var(flag_reorder_blocks)
716 Reorder basic blocks to improve code placement
718 freorder-blocks-and-partition
719 Common Report Var(flag_reorder_blocks_and_partition)
720 Reorder basic blocks and partition into hot and cold sections
723 Common Report Var(flag_reorder_functions)
724 Reorder functions to improve code placement
726 frerun-cse-after-loop
727 Common Report Var(flag_rerun_cse_after_loop) Init(2)
728 Add a common subexpression elimination pass after loop optimizations
732 Does nothing. Preserved for backward compatibility.
735 Common Report Var(flag_rounding_math)
736 Disable optimizations that assume default FP rounding behavior
739 Common Report Var(flag_schedule_interblock) Init(1)
740 Enable scheduling across basic blocks
743 Common Report Var(flag_schedule_speculative) Init(1)
744 Allow speculative motion of non-loads
747 Common Report Var(flag_schedule_speculative_load)
748 Allow speculative motion of some loads
750 fsched-spec-load-dangerous
751 Common Report Var(flag_schedule_speculative_load_dangerous)
752 Allow speculative motion of more loads
755 Common RejectNegative Joined
756 -fsched-verbose=<number> Set the verbosity level of the scheduler
758 fsched2-use-superblocks
759 Common Report Var(flag_sched2_use_superblocks)
760 If scheduling post reload, do superblock scheduling
763 Common Report Var(flag_sched2_use_traces)
764 If scheduling post reload, do trace scheduling
767 Common Report Var(flag_schedule_insns)
768 Reschedule instructions before register allocation
771 Common Report Var(flag_schedule_insns_after_reload)
772 Reschedule instructions after register allocation
774 ; sched_stalled_insns means that insns can be moved prematurely from the queue
775 ; of stalled insns into the ready list.
777 Common Report Var(flag_sched_stalled_insns)
778 Allow premature scheduling of queued insns
780 fsched-stalled-insns=
781 Common RejectNegative Joined UInteger
782 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
784 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
785 ; be examined for a dependency on a stalled insn that is candidate for
786 ; premature removal from the queue of stalled insns into the ready list (has
787 ; an effect only if the flag 'sched_stalled_insns' is set).
788 fsched-stalled-insns-dep
789 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1)
790 Set dependence distance checking in premature scheduling of queued insns
792 fsched-stalled-insns-dep=
793 Common RejectNegative Joined UInteger
794 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
797 Common Report Var(flag_section_anchors)
798 Access data in the same section from shared anchor points
800 frtl-abstract-sequences
801 Common Report Var(flag_rtl_seqabstr)
802 Perform sequence abstraction optimization on RTL
805 Common C ObjC C++ ObjC++ Report Var(flag_show_column) Init(1)
806 Show column numbers in diagnostics, when available. Default on
809 Common Report Var(flag_signaling_nans)
810 Disable optimizations observable by IEEE signaling NaNs
812 fsingle-precision-constant
813 Common Report Var(flag_single_precision_constant)
814 Convert floating point constants to single precision constants
816 fsplit-ivs-in-unroller
817 Common Report Var(flag_split_ivs_in_unroller) Init(1)
818 Split lifetimes of induction variables when loops are unrolled
820 fvariable-expansion-in-unroller
821 Common Report Var(flag_variable_expansion_in_unroller)
822 Apply variable expansion when loops are unrolled
824 ; Emit code to probe the stack, to help detect stack overflow; also
825 ; may cause large objects to be allocated dynamically.
827 Common Report Var(flag_stack_check)
828 Insert stack checking code into the program
833 fstack-limit-register=
834 Common RejectNegative Joined
835 -fstack-limit-register=<register> Trap if the stack goes past <register>
838 Common RejectNegative Joined
839 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
842 Common Report Var(flag_stack_protect, 1)
843 Use propolice as a stack protection method
846 Common Report RejectNegative Var(flag_stack_protect, 2) VarExists
847 Use a stack protection method for every function
851 Does nothing. Preserved for backward compatibility.
853 ; Nonzero if we should do (language-dependent) alias analysis.
854 ; Typically, this analysis will assume that expressions of certain
855 ; types do not alias expressions of certain other types. Only used
856 ; if alias analysis (in general) is enabled.
858 Common Report Var(flag_strict_aliasing)
859 Assume strict aliasing rules apply
862 Common Report Var(flag_syntax_only)
863 Check for syntax errors, then stop
866 Common Report Var(flag_test_coverage)
867 Create data files needed by \"gcov\"
870 Common Report Var(flag_thread_jumps)
871 Perform jump threading optimizations
874 Common Report Var(time_report)
875 Report the time taken by each compiler pass
878 Common Joined RejectNegative
879 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
882 Common Report Var(flag_toplevel_reorder) Init(1)
883 Reorder top level functions, variables, and asms
886 Common Report Var(flag_tracer)
887 Perform superblock formation via tail duplication
889 ; Zero means that floating-point math operations cannot generate a
890 ; (user-visible) trap. This is the case, for example, in nonstop
891 ; IEEE 754 arithmetic.
893 Common Report Var(flag_trapping_math) Init(1)
894 Assume floating-point operations can trap
897 Common Report Var(flag_trapv)
898 Trap for signed overflow in addition, subtraction and multiplication
901 Common Report Var(flag_tree_ccp)
902 Enable SSA-CCP optimization on trees
905 Common Report Var(flag_tree_store_ccp)
906 Enable SSA-CCP optimization for stores and loads
909 Common Report Var(flag_tree_ch)
910 Enable loop header copying on trees
913 Common Report Var(flag_tree_combine_temps)
914 Coalesce memory temporaries in the SSA->normal pass
917 Common Report Var(flag_tree_copyrename)
918 Replace SSA temporaries with better names in copies
921 Common Report Var(flag_tree_copy_prop)
922 Enable copy propagation on trees
924 ftree-store-copy-prop
925 Common Report Var(flag_tree_store_copy_prop)
926 Enable copy propagation for stores and loads
929 Common Report Var(flag_tree_dce)
930 Enable SSA dead code elimination optimization on trees
933 Common Report Var(flag_tree_dom)
934 Enable dominator optimizations
937 Common Report Var(flag_tree_dse)
938 Enable dead store elimination
941 Common Report Var(flag_tree_fre)
942 Enable Full Redundancy Elimination (FRE) on trees
945 Common Report Var(flag_tree_loop_im) Init(1)
946 Enable loop invariant motion on trees
949 Common Report Var(flag_tree_loop_linear)
950 Enable linear loop transforms on trees
953 Common Report Var(flag_tree_loop_ivcanon) Init(1)
954 Create canonical induction variables in loops
957 Common Report Var(flag_tree_loop_optimize) Init(1)
958 Enable loop optimizations on tree level
961 Common Report Var(flag_tree_pre)
962 Enable SSA-PRE optimization on trees
965 Common Report Var(flag_tree_salias)
966 Perform structural alias analysis
969 Common Report Var(flag_tree_sink)
970 Enable SSA code sinking on trees
973 Common Report Var(flag_tree_sra)
974 Perform scalar replacement of aggregates
977 Common Report Var(flag_tree_ter)
978 Replace temporary expressions in the SSA->normal pass
981 Common Report Var(flag_tree_live_range_split)
982 Perform live range splitting during the SSA->normal pass
985 Common Report Var(flag_tree_vrp) Init(0)
986 Perform Value Range Propagation on trees
989 Common Report Var(flag_unit_at_a_time)
990 Compile whole compilation unit at a time
993 Common Report Var(flag_unroll_loops)
994 Perform loop unrolling when iteration count is known
997 Common Report Var(flag_unroll_all_loops)
998 Perform loop unrolling for all loops
1000 ; Nonzero means that loop optimizer may assume that the induction variables
1001 ; that control loops do not overflow and that the loops with nontrivial
1002 ; exit condition are not infinite
1003 funsafe-loop-optimizations
1004 Common Report Var(flag_unsafe_loop_optimizations)
1005 Allow loop optimizations to assume that the loops behave in normal way
1007 ; Nonzero means that unsafe floating-point math optimizations are allowed
1008 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
1009 ; are allowed to assume that their arguments and results are "normal"
1010 ; (e.g., nonnegative for SQRT).
1011 funsafe-math-optimizations
1012 Common Report Var(flag_unsafe_math_optimizations)
1013 Allow math optimizations that may violate IEEE or ISO standards
1016 Common Report Var(flag_unswitch_loops)
1017 Perform loop unswitching
1020 Common Report Var(flag_unwind_tables)
1021 Just generate unwind tables for exception handling
1024 Common Report Var(flag_var_tracking) VarExists
1025 Perform variable tracking
1028 Common Report Var(flag_tree_vectorize)
1029 Enable loop vectorization on trees
1031 ftree-vect-loop-version
1032 Common Report Var(flag_tree_vect_loop_version) Init(1)
1033 Enable loop versioning when doing loop vectorization on trees
1035 ftree-vectorizer-verbose=
1036 Common RejectNegative Joined
1037 -ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
1039 ; -fverbose-asm causes extra commentary information to be produced in
1040 ; the generated assembly code (to make it more readable). This option
1041 ; is generally only of use to those who actually need to read the
1042 ; generated assembly code (perhaps while debugging the compiler itself).
1043 ; -fno-verbose-asm, the default, causes the extra information
1044 ; to not be added and is useful when comparing two assembler files.
1046 Common Report Var(flag_verbose_asm)
1047 Add extra commentary to assembler output
1050 Common Joined RejectNegative
1051 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
1055 Common Report Var(flag_value_profile_transformations)
1056 Use expression value profiles in optimizations
1059 Common Report Var(flag_web) Init(2)
1060 Construct webs and split unrelated uses of single variable
1063 Common Report Var(flag_whole_program) Init(0)
1064 Perform whole program optimizations
1067 Common Report Var(flag_wrapv)
1068 Assume signed arithmetic overflow wraps around
1070 fzero-initialized-in-bss
1071 Common Report Var(flag_zero_initialized_in_bss) Init(1)
1072 Put zero initialized data in the bss section
1075 Common JoinedOrMissing
1076 Generate debug information in default format
1079 Common JoinedOrMissing
1080 Generate debug information in COFF format
1083 Common JoinedOrMissing
1084 Generate debug information in DWARF v2 format
1087 Common JoinedOrMissing
1088 Generate debug information in default extended format
1091 Common JoinedOrMissing
1092 Generate debug information in STABS format
1095 Common JoinedOrMissing
1096 Generate debug information in extended STABS format
1099 Common JoinedOrMissing
1100 Generate debug information in VMS format
1103 Common JoinedOrMissing
1104 Generate debug information in XCOFF format
1107 Common JoinedOrMissing
1108 Generate debug information in extended XCOFF format
1111 Common Joined Separate
1112 -o <file> Place output into <file>
1115 Common Var(profile_flag)
1116 Enable function profiling
1119 Common Var(pedantic)
1120 Issue warnings needed for strict compliance to the standard
1124 Like -pedantic but issue them as errors
1127 Common Var(quiet_flag)
1128 Do not display functions compiled or elapsed time
1131 Common Var(version_flag)
1132 Display the compiler's version
1135 Common Var(inhibit_warnings)
1138 ; This comment is to ensure we retain the blank line above.