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
400 femit-class-debug-always
401 Common Report Var(flag_emit_class_debug_always) Init(1)
402 Do not suppress C++ class debug information.
405 Common Report Var(flag_exceptions)
406 Enable exception handling
408 fexpensive-optimizations
409 Common Report Var(flag_expensive_optimizations)
410 Perform a number of minor, expensive optimizations
416 Common Report Var(flag_finite_math_only)
417 Assume no NaNs or infinities are generated
420 Common Joined RejectNegative
421 -ffixed-<register> Mark <register> as being unavailable to the compiler
424 Common Report Var(flag_float_store)
425 Don't allocate floats and doubles in extended-precision registers
427 ; Nonzero for -fforce-addr: load memory address into a register before
428 ; reference to memory. This makes better cse but slower compilation.
430 Common Report Var(flag_force_addr)
431 Copy memory address constants into registers before use
433 ; Nonzero for -fforce-mem: load memory value into a register
434 ; before arithmetic on it. This makes better cse but slower compilation.
436 Common Report Var(flag_force_mem)
437 Copy memory operands into registers before use
439 ; Nonzero means don't put addresses of constant functions in registers.
440 ; Used for compiling the Unix kernel, where strange substitutions are
441 ; done on the assembly output.
443 Common Report Var(flag_no_function_cse,0)
444 Allow function addresses to be held in registers
447 Common Report Var(flag_function_sections)
448 Place each function into its own section
451 Common Report Var(flag_gcse)
452 Perform global common subexpression elimination
455 Common Report Var(flag_gcse_lm) Init(1)
456 Perform enhanced load motion during global common subexpression elimination
459 Common Report Var(flag_gcse_sm) Init(0)
460 Perform store motion after global common subexpression elimination
463 Common Report Var(flag_gcse_las) Init(0)
464 Perform redundant load after store elimination in global common subexpression
468 Common Report Var(flag_gcse_after_reload)
469 Perform global common subexpression elimination after register allocation
472 fguess-branch-probability
473 Common Report Var(flag_guess_branch_prob)
474 Enable guessing of branch probabilities
476 ; Nonzero means ignore `#ident' directives. 0 means handle them.
477 ; Generate position-independent code for executables if possible
478 ; On SVR4 targets, it also controls whether or not to emit a
479 ; string identifying the compiler.
481 Common Report Var(flag_no_ident,0)
482 Process #ident directives
485 Common Report Var(flag_if_conversion)
486 Perform conversion of conditional jumps to branchless equivalents
489 Common Report Var(flag_if_conversion2)
490 Perform conversion of conditional jumps to conditional execution
492 ; -finhibit-size-directive inhibits output of .size for ELF.
493 ; This is used only for compiling crtstuff.c,
494 ; and it may be extended to other effects
495 ; needed for crtstuff.c on other systems.
496 finhibit-size-directive
497 Common Report Var(flag_inhibit_size_directive)
498 Do not generate .size directives
500 ; Nonzero means that functions declared `inline' will be treated
501 ; as `static'. Prevents generation of zillions of copies of unused
502 ; static inline functions; instead, `inlines' are written out
503 ; only when actually used. Used in conjunction with -g. Also
504 ; does the right thing with #pragma interface.
506 Common Report Var(flag_no_inline,0) Init(2)
507 Pay attention to the \"inline\" keyword
510 Common Report Var(flag_inline_functions)
511 Integrate simple functions into their callers
513 finline-functions-called-once
514 Common Report Var(flag_inline_functions_called_once) Init(1)
515 Integrate functions called once into their callers
518 Common RejectNegative Joined UInteger
521 Common RejectNegative Joined UInteger
522 -finline-limit=<number> Limit the size of inlined functions to <number>
524 finstrument-functions
525 Common Report Var(flag_instrument_function_entry_exit)
526 Instrument function entry and exit with profiling calls
529 Common Report Var(flag_ipa_cp)
530 Perform Interprocedural constant propagation
533 Common Report Var(flag_ipa_pure_const) Init(0)
534 Discover pure and const functions
537 Common Report Var(flag_ipa_pta) Init(0)
538 Perform interprocedural points-to analysis
541 Common Report Var(flag_ipa_reference) Init(0)
542 Discover readonly and non addressable static variables
545 Common Report Var(flag_ipa_type_escape) Init(0)
546 Type based escape and alias analysis
549 Common Report Var(flag_ivopts) Init(1)
550 Optimize induction variables on trees
553 Common Var(flag_jump_tables) Init(1)
554 Use jump tables for sufficiently large switch statements
556 fkeep-inline-functions
557 Common Report Var(flag_keep_inline_functions)
558 Generate code for functions even if they are fully inlined
561 Common Report Var(flag_keep_static_consts) Init(1)
562 Emit static const variables even if they are not used
565 Common Report Var(flag_leading_underscore) Init(-1)
566 Give external symbols a leading underscore
570 Does nothing. Preserved for backward compatibility.
573 Common Report Var(flag_errno_math) Init(1)
574 Set errno after built-in math functions
577 Common Report Var(mem_report)
578 Report on permanent memory allocation
580 ; This will attempt to merge constant section constants, if 1 only
581 ; string constants and constants from constant pool, if 2 also constant
584 Common Report Var(flag_merge_constants,2) Init(1)
585 Attempt to merge identical constants and constant variables
588 Common Report Var(flag_merge_constants,1) VarExists
589 Attempt to merge identical constants across compilation units
592 Common RejectNegative Joined UInteger
593 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
596 Common Report Var(flag_modulo_sched)
597 Perform SMS based modulo scheduling before the first scheduling pass
599 fmove-loop-invariants
600 Common Report Var(flag_move_loop_invariants) Init(1)
601 Move loop invariant computations out of loops
604 Common RejectNegative Report Var(flag_mudflap)
605 Add mudflap bounds-checking instrumentation for single-threaded program
608 Common RejectNegative Report Var(flag_mudflap_threads)
609 Add mudflap bounds-checking instrumentation for multi-threaded program
612 Common RejectNegative Report Var(flag_mudflap_ignore_reads)
613 Ignore read operations when inserting mudflap instrumentation
615 freschedule-modulo-scheduled-loops
616 Common Report Var(flag_resched_modulo_sched)
617 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
620 Common Report Var(flag_non_call_exceptions)
621 Support synchronous non-call exceptions
624 Common Report Var(flag_omit_frame_pointer)
625 When possible do not generate stack frames
627 foptimize-register-move
628 Common Report Var(flag_regmove)
629 Do the full register move optimization pass
631 foptimize-sibling-calls
632 Common Report Var(flag_optimize_sibling_calls)
633 Optimize sibling and tail recursive calls
636 Common Report Var(flag_pack_struct)
637 Pack structure members together without holes
640 Common RejectNegative Joined UInteger
641 -fpack-struct=<number> Set initial maximum structure member alignment
644 Common Report Var(flag_pcc_struct_return,1) VarExists
645 Return small aggregates in memory, not registers
648 Common Report Var(flag_peel_loops)
652 Common Report Var(flag_no_peephole,0)
653 Enable machine specific peephole optimizations
656 Common Report Var(flag_peephole2)
657 Enable an RTL peephole pass before sched2
660 Common Report Var(flag_pic,2)
661 Generate position-independent code if possible (large mode)
664 Common Report Var(flag_pie,2)
665 Generate position-independent code for executables if possible (large mode)
668 Common Report Var(flag_pic,1) VarExists
669 Generate position-independent code if possible (small mode)
672 Common Report Var(flag_pie,1) VarExists
673 Generate position-independent code for executables if possible (small mode)
675 fprefetch-loop-arrays
676 Common Report Var(flag_prefetch_loop_arrays)
677 Generate prefetch instructions, if available, for arrays in loops
680 Common Report Var(profile_flag)
681 Enable basic program profiling code
684 Common Report Var(profile_arc_flag)
685 Insert arc-based program profiling code
689 Enable common options for generating profile info for profile feedback directed optimizations
693 Enable common options for performing profile feedback directed optimizations
696 Common Report Var(flag_profile_values)
697 Insert code to profile values of expressions
703 Common Joined RejectNegative
704 -frandom-seed=<string> Make compile reproducible using <string>
707 Common Report Var(flag_pcc_struct_return,0) VarExists
708 Return small aggregates in registers
711 Common Report Var(flag_regmove)
712 Enables a register move optimization
715 Common Report Var(flag_rename_registers) Init(2)
716 Perform a register renaming optimization pass
719 Common Report Var(flag_reorder_blocks)
720 Reorder basic blocks to improve code placement
722 freorder-blocks-and-partition
723 Common Report Var(flag_reorder_blocks_and_partition)
724 Reorder basic blocks and partition into hot and cold sections
727 Common Report Var(flag_reorder_functions)
728 Reorder functions to improve code placement
730 frerun-cse-after-loop
731 Common Report Var(flag_rerun_cse_after_loop) Init(2)
732 Add a common subexpression elimination pass after loop optimizations
736 Does nothing. Preserved for backward compatibility.
739 Common Report Var(flag_rounding_math)
740 Disable optimizations that assume default FP rounding behavior
743 Common Report Var(flag_schedule_interblock) Init(1)
744 Enable scheduling across basic blocks
747 Common Report Var(flag_schedule_speculative) Init(1)
748 Allow speculative motion of non-loads
751 Common Report Var(flag_schedule_speculative_load)
752 Allow speculative motion of some loads
754 fsched-spec-load-dangerous
755 Common Report Var(flag_schedule_speculative_load_dangerous)
756 Allow speculative motion of more loads
759 Common RejectNegative Joined
760 -fsched-verbose=<number> Set the verbosity level of the scheduler
762 fsched2-use-superblocks
763 Common Report Var(flag_sched2_use_superblocks)
764 If scheduling post reload, do superblock scheduling
767 Common Report Var(flag_sched2_use_traces)
768 If scheduling post reload, do trace scheduling
771 Common Report Var(flag_schedule_insns)
772 Reschedule instructions before register allocation
775 Common Report Var(flag_schedule_insns_after_reload)
776 Reschedule instructions after register allocation
778 ; sched_stalled_insns means that insns can be moved prematurely from the queue
779 ; of stalled insns into the ready list.
781 Common Report Var(flag_sched_stalled_insns)
782 Allow premature scheduling of queued insns
784 fsched-stalled-insns=
785 Common RejectNegative Joined UInteger
786 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
788 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
789 ; be examined for a dependency on a stalled insn that is candidate for
790 ; premature removal from the queue of stalled insns into the ready list (has
791 ; an effect only if the flag 'sched_stalled_insns' is set).
792 fsched-stalled-insns-dep
793 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1)
794 Set dependence distance checking in premature scheduling of queued insns
796 fsched-stalled-insns-dep=
797 Common RejectNegative Joined UInteger
798 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
801 Common Report Var(flag_section_anchors)
802 Access data in the same section from shared anchor points
804 frtl-abstract-sequences
805 Common Report Var(flag_rtl_seqabstr)
806 Perform sequence abstraction optimization on RTL
809 Common C ObjC C++ ObjC++ Report Var(flag_show_column) Init(1)
810 Show column numbers in diagnostics, when available. Default on
813 Common Report Var(flag_signaling_nans)
814 Disable optimizations observable by IEEE signaling NaNs
816 fsingle-precision-constant
817 Common Report Var(flag_single_precision_constant)
818 Convert floating point constants to single precision constants
820 fsplit-ivs-in-unroller
821 Common Report Var(flag_split_ivs_in_unroller) Init(1)
822 Split lifetimes of induction variables when loops are unrolled
824 fvariable-expansion-in-unroller
825 Common Report Var(flag_variable_expansion_in_unroller)
826 Apply variable expansion when loops are unrolled
828 ; Emit code to probe the stack, to help detect stack overflow; also
829 ; may cause large objects to be allocated dynamically.
831 Common Report Var(flag_stack_check)
832 Insert stack checking code into the program
837 fstack-limit-register=
838 Common RejectNegative Joined
839 -fstack-limit-register=<register> Trap if the stack goes past <register>
842 Common RejectNegative Joined
843 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
846 Common Report Var(flag_stack_protect, 1)
847 Use propolice as a stack protection method
850 Common Report RejectNegative Var(flag_stack_protect, 2) VarExists
851 Use a stack protection method for every function
855 Does nothing. Preserved for backward compatibility.
857 ; Nonzero if we should do (language-dependent) alias analysis.
858 ; Typically, this analysis will assume that expressions of certain
859 ; types do not alias expressions of certain other types. Only used
860 ; if alias analysis (in general) is enabled.
862 Common Report Var(flag_strict_aliasing)
863 Assume strict aliasing rules apply
866 Common Report Var(flag_syntax_only)
867 Check for syntax errors, then stop
870 Common Report Var(flag_test_coverage)
871 Create data files needed by \"gcov\"
874 Common Report Var(flag_thread_jumps)
875 Perform jump threading optimizations
878 Common Report Var(time_report)
879 Report the time taken by each compiler pass
882 Common Joined RejectNegative
883 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
886 Common Report Var(flag_toplevel_reorder) Init(1)
887 Reorder top level functions, variables, and asms
890 Common Report Var(flag_tracer)
891 Perform superblock formation via tail duplication
893 ; Zero means that floating-point math operations cannot generate a
894 ; (user-visible) trap. This is the case, for example, in nonstop
895 ; IEEE 754 arithmetic.
897 Common Report Var(flag_trapping_math) Init(1)
898 Assume floating-point operations can trap
901 Common Report Var(flag_trapv)
902 Trap for signed overflow in addition, subtraction and multiplication
905 Common Report Var(flag_tree_ccp)
906 Enable SSA-CCP optimization on trees
909 Common Report Var(flag_tree_store_ccp)
910 Enable SSA-CCP optimization for stores and loads
913 Common Report Var(flag_tree_ch)
914 Enable loop header copying on trees
917 Common Report Var(flag_tree_combine_temps)
918 Coalesce memory temporaries in the SSA->normal pass
921 Common Report Var(flag_tree_copyrename)
922 Replace SSA temporaries with better names in copies
925 Common Report Var(flag_tree_copy_prop)
926 Enable copy propagation on trees
928 ftree-store-copy-prop
929 Common Report Var(flag_tree_store_copy_prop)
930 Enable copy propagation for stores and loads
933 Common Report Var(flag_tree_dce)
934 Enable SSA dead code elimination optimization on trees
937 Common Report Var(flag_tree_dom)
938 Enable dominator optimizations
941 Common Report Var(flag_tree_dse)
942 Enable dead store elimination
945 Common Report Var(flag_tree_fre)
946 Enable Full Redundancy Elimination (FRE) on trees
949 Common Report Var(flag_tree_loop_im) Init(1)
950 Enable loop invariant motion on trees
953 Common Report Var(flag_tree_loop_linear)
954 Enable linear loop transforms on trees
957 Common Report Var(flag_tree_loop_ivcanon) Init(1)
958 Create canonical induction variables in loops
961 Common Report Var(flag_tree_loop_optimize) Init(1)
962 Enable loop optimizations on tree level
965 Common Report Var(flag_tree_pre)
966 Enable SSA-PRE optimization on trees
969 Common Report Var(flag_tree_salias)
970 Perform structural alias analysis
973 Common Report Var(flag_tree_sink)
974 Enable SSA code sinking on trees
977 Common Report Var(flag_tree_sra)
978 Perform scalar replacement of aggregates
981 Common Report Var(flag_tree_ter)
982 Replace temporary expressions in the SSA->normal pass
985 Common Report Var(flag_tree_live_range_split)
986 Perform live range splitting during the SSA->normal pass
989 Common Report Var(flag_tree_vrp) Init(0)
990 Perform Value Range Propagation on trees
993 Common Report Var(flag_unit_at_a_time)
994 Compile whole compilation unit at a time
997 Common Report Var(flag_unroll_loops)
998 Perform loop unrolling when iteration count is known
1001 Common Report Var(flag_unroll_all_loops)
1002 Perform loop unrolling for all loops
1004 ; Nonzero means that loop optimizer may assume that the induction variables
1005 ; that control loops do not overflow and that the loops with nontrivial
1006 ; exit condition are not infinite
1007 funsafe-loop-optimizations
1008 Common Report Var(flag_unsafe_loop_optimizations)
1009 Allow loop optimizations to assume that the loops behave in normal way
1011 ; Nonzero means that unsafe floating-point math optimizations are allowed
1012 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
1013 ; are allowed to assume that their arguments and results are "normal"
1014 ; (e.g., nonnegative for SQRT).
1015 funsafe-math-optimizations
1016 Common Report Var(flag_unsafe_math_optimizations)
1017 Allow math optimizations that may violate IEEE or ISO standards
1020 Common Report Var(flag_unswitch_loops)
1021 Perform loop unswitching
1024 Common Report Var(flag_unwind_tables)
1025 Just generate unwind tables for exception handling
1028 Common Report Var(flag_var_tracking) VarExists
1029 Perform variable tracking
1032 Common Report Var(flag_tree_vectorize)
1033 Enable loop vectorization on trees
1035 ftree-vect-loop-version
1036 Common Report Var(flag_tree_vect_loop_version) Init(1)
1037 Enable loop versioning when doing loop vectorization on trees
1039 ftree-vectorizer-verbose=
1040 Common RejectNegative Joined
1041 -ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
1043 ; -fverbose-asm causes extra commentary information to be produced in
1044 ; the generated assembly code (to make it more readable). This option
1045 ; is generally only of use to those who actually need to read the
1046 ; generated assembly code (perhaps while debugging the compiler itself).
1047 ; -fno-verbose-asm, the default, causes the extra information
1048 ; to not be added and is useful when comparing two assembler files.
1050 Common Report Var(flag_verbose_asm)
1051 Add extra commentary to assembler output
1054 Common Joined RejectNegative
1055 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
1059 Common Report Var(flag_value_profile_transformations)
1060 Use expression value profiles in optimizations
1063 Common Report Var(flag_web) Init(2)
1064 Construct webs and split unrelated uses of single variable
1067 Common Report Var(flag_whole_program) Init(0)
1068 Perform whole program optimizations
1071 Common Report Var(flag_wrapv)
1072 Assume signed arithmetic overflow wraps around
1074 fzero-initialized-in-bss
1075 Common Report Var(flag_zero_initialized_in_bss) Init(1)
1076 Put zero initialized data in the bss section
1079 Common JoinedOrMissing
1080 Generate debug information in default format
1083 Common JoinedOrMissing
1084 Generate debug information in COFF format
1087 Common JoinedOrMissing
1088 Generate debug information in DWARF v2 format
1091 Common JoinedOrMissing
1092 Generate debug information in default extended format
1095 Common JoinedOrMissing
1096 Generate debug information in STABS format
1099 Common JoinedOrMissing
1100 Generate debug information in extended STABS format
1103 Common JoinedOrMissing
1104 Generate debug information in VMS format
1107 Common JoinedOrMissing
1108 Generate debug information in XCOFF format
1111 Common JoinedOrMissing
1112 Generate debug information in extended XCOFF format
1115 Common Joined Separate
1116 -o <file> Place output into <file>
1119 Common Var(profile_flag)
1120 Enable function profiling
1123 Common Var(pedantic)
1124 Issue warnings needed for strict compliance to the standard
1128 Like -pedantic but issue them as errors
1131 Common Var(quiet_flag)
1132 Do not display functions compiled or elapsed time
1135 Common Var(version_flag)
1136 Display the compiler's version
1139 Common Var(inhibit_warnings)
1142 ; This comment is to ensure we retain the blank line above.