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_array_bounds)
66 Warn if an array is accessed out of bounds
69 Common Var(warn_attributes) Init(1)
70 Warn about inappropriate attribute usage
73 Common Var(warn_cast_align)
74 Warn about pointer casts which increase alignment
76 Wdeprecated-declarations
77 Common Var(warn_deprecated_decl) Init(1)
78 Warn about uses of __attribute__((deprecated)) declarations
80 Wdisabled-optimization
81 Common Var(warn_disabled_optimization)
82 Warn when an optimization pass is disabled
85 Common Var(warnings_are_errors)
86 Treat all warnings as errors
90 Treat specified warning as error
94 Print extra (possibly unwanted) warnings
97 Common Var(flag_fatal_errors)
98 Exit on the first error occurred
101 Common Var(warn_inline)
102 Warn when an inlined function cannot be inlined
105 Common RejectNegative Joined UInteger
106 -Wlarger-than-<number> Warn if an object is larger than <number> bytes
108 Wunsafe-loop-optimizations
109 Common Var(warn_unsafe_loop_optimizations)
110 Warn if the loop cannot be optimized due to nontrivial assumptions.
113 Common Var(warn_missing_noreturn)
114 Warn about functions which might be candidates for __attribute__((noreturn))
117 Common Var(warn_overflow) Init(1)
118 Warn about overflow in arithmetic expressions
121 Common Var(warn_packed)
122 Warn when the packed attribute has no effect on struct layout
125 Common Var(warn_padded)
126 Warn when padding is required to align structure members
129 Common Var(warn_shadow)
130 Warn when one local variable shadows another
133 Common Var(warn_stack_protect)
134 Warn when not issuing stack smashing protection for some reason
138 Warn about code which might break strict aliasing rules
141 Common Joined UInteger
142 Warn about code which might break strict aliasing rules
144 Wstring-literal-comparison
145 Common Var(warn_string_literal_comparison)
146 Warn about comparisons to constant string literals
149 Common Var(warn_switch)
150 Warn about enumerated switches, with no default, missing a case
153 Common Var(warn_switch_default)
154 Warn about enumerated switches missing a \"default:\" statement
157 Common Var(warn_switch_enum)
158 Warn about all enumerated switches missing a specific case
161 Common Var(warn_system_headers)
162 Do not suppress warnings from system headers
165 Common Var(warn_uninitialized)
166 Warn about uninitialized automatic variables
169 Common Var(warn_notreached)
170 Warn about code that will never be executed
174 Enable all -Wunused- warnings
177 Common Var(warn_unused_function)
178 Warn when a function is unused
181 Common Var(warn_unused_label)
182 Warn when a label is unused
185 Common Var(warn_unused_parameter)
186 Warn when a function parameter is unused
189 Common Var(warn_unused_value)
190 Warn when an expression value is unused
193 Common Var(warn_unused_variable)
194 Warn when a variable is unused
196 Wvolatile-register-var
197 Common Var(warn_register_var)
198 Warn when a register variable is declared volatile
202 -aux-info <file> Emit declaration information into <file>
215 -d<letters> Enable dumps from specific passes of the compiler
219 -dumpbase <file> Set the file basename to be used for dumps
221 ; The version of the C++ ABI in use. The following values are allowed:
223 ; 0: The version of the ABI believed most conformant with the C++ ABI
224 ; specification. This ABI may change as bugs are discovered and fixed.
225 ; Therefore, 0 will not necessarily indicate the same ABI in different
228 ; 1: The version of the ABI first used in G++ 3.2.
230 ; Additional positive integers will be assigned as new versions of
231 ; the ABI become the default version of the ABI.
233 Common Joined UInteger Var(flag_abi_version) Init(2)
236 Common Report Var(align_functions,0)
237 Align the start of functions
240 Common RejectNegative Joined UInteger
243 Common Report Var(align_jumps,0)
244 Align labels which are only reached by jumping
247 Common RejectNegative Joined UInteger
250 Common Report Var(align_labels,0)
254 Common RejectNegative Joined UInteger
257 Common Report Var(align_loops)
258 Align the start of loops
261 Common RejectNegative Joined UInteger
263 ; This flag is only tested if alias checking is enabled.
264 ; 0 if pointer arguments may alias each other. True in C.
265 ; 1 if pointer arguments may not alias each other but may alias
267 ; 2 if pointer arguments may not alias each other and may not
268 ; alias global variables.
269 ; 3 if pointer arguments may not alias anything. True in Fortran.
270 ; Set by the front end.
272 Common Report Var(flag_argument_noalias,0)
273 Specify that arguments may alias each other and globals
276 Common Report Var(flag_argument_noalias,1) VarExists
277 Assume arguments may alias globals but not each other
279 fargument-noalias-global
280 Common Report Var(flag_argument_noalias,2) VarExists
281 Assume arguments alias neither each other nor globals
283 fargument-noalias-anything
284 Common Report Var(flag_argument_noalias,3) VarExists
285 Assume arguments alias no other storage
287 fasynchronous-unwind-tables
288 Common Report Var(flag_asynchronous_unwind_tables)
289 Generate unwind tables that are exact at each instruction boundary
291 ; -fcheck-bounds causes gcc to generate array bounds checks.
292 ; For C, C++ and ObjC: defaults off.
293 ; For Java: defaults to on.
294 ; For Fortran: defaults to off.
296 Common Report Var(flag_bounds_check)
297 Generate code to check bounds before indexing arrays
300 Common Report Var(flag_branch_on_count_reg) Init(1)
301 Replace add, compare, branch with branch on count register
303 fbranch-probabilities
304 Common Report Var(flag_branch_probabilities)
305 Use profiling information for branch probabilities
307 fbranch-target-load-optimize
308 Common Report Var(flag_branch_target_load_optimize)
309 Perform branch target load optimization before prologue / epilogue threading
311 fbranch-target-load-optimize2
312 Common Report Var(flag_branch_target_load_optimize2)
313 Perform branch target load optimization after prologue / epilogue threading
316 Common Report Var(flag_btr_bb_exclusive)
317 Restrict target load migration not to re-use registers in any basic block
320 Common Joined RejectNegative
321 -fcall-saved-<register> Mark <register> as being preserved across functions
324 Common Joined RejectNegative
325 -fcall-used-<register> Mark <register> as being corrupted by function calls
327 ; Nonzero for -fcaller-saves: allocate values in regs that need to
328 ; be saved across function calls, if that produces overall better code.
329 ; Optional now, so people can test it.
331 Common Report Var(flag_caller_saves)
332 Save registers around function calls
335 Common Report Var(flag_no_common,0)
336 Do not put uninitialized globals in the common section
339 Common Report Var(flag_cprop_registers)
340 Perform a register copy-propagation optimization pass
343 Common Report Var(flag_crossjumping)
344 Perform cross-jumping optimization
347 Common Report Var(flag_cse_follow_jumps)
348 When running CSE, follow jumps to their targets
351 Common Report Var(flag_cse_skip_blocks)
352 When running CSE, follow conditional jumps
355 Common Report Var(flag_cx_limited_range)
356 Omit range reduction step when performing complex division
359 Common Report Var(flag_data_sections)
360 Place data items into their own section
362 ; Nonzero for -fdefer-pop: don't pop args after each function call
363 ; instead save them up to pop many calls' args with one insns.
365 Common Report Var(flag_defer_pop)
366 Defer popping functions args from stack until later
369 Common Report Var(flag_delayed_branch)
370 Attempt to fill delay slots of branch instructions
372 fdelete-null-pointer-checks
373 Common Report Var(flag_delete_null_pointer_checks)
374 Delete useless null pointer checks
376 fdiagnostics-show-location=
377 Common Joined RejectNegative
378 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
380 fdiagnostics-show-option
382 Amend appropriate diagnostic messages with the command line option that controls them
385 Common Joined RejectNegative
386 -fdump-<type> Dump various compiler internals to a file
389 Common Report Var(flag_dump_noaddr)
390 Suppress output of addresses in debugging dumps
393 Common Report Var(flag_dump_unnumbered) VarExists
394 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
397 Common Report Var(flag_early_inlining) Init(1)
398 Perform early inlining
400 feliminate-dwarf2-dups
401 Common Report Var(flag_eliminate_dwarf2_dups)
402 Perform DWARF2 duplicate elimination
404 feliminate-unused-debug-symbols
405 Common Report Var(flag_debug_only_used_symbols)
406 Perform unused type elimination in debug info
408 feliminate-unused-debug-types
409 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
410 Perform unused type elimination in debug info
412 femit-class-debug-always
413 Common Report Var(flag_emit_class_debug_always) Init(1)
414 Do not suppress C++ class debug information.
417 Common Report Var(flag_exceptions)
418 Enable exception handling
420 fexpensive-optimizations
421 Common Report Var(flag_expensive_optimizations)
422 Perform a number of minor, expensive optimizations
428 Common Report Var(flag_finite_math_only)
429 Assume no NaNs or infinities are generated
432 Common Joined RejectNegative
433 -ffixed-<register> Mark <register> as being unavailable to the compiler
436 Common Report Var(flag_float_store)
437 Don't allocate floats and doubles in extended-precision registers
439 ; Nonzero for -fforce-addr: load memory address into a register before
440 ; reference to memory. This makes better cse but slower compilation.
442 Common Report Var(flag_force_addr)
443 Copy memory address constants into registers before use
446 Common Report Var(flag_forward_propagate)
447 Perform a forward propagation pass on RTL
449 ; Nonzero means don't put addresses of constant functions in registers.
450 ; Used for compiling the Unix kernel, where strange substitutions are
451 ; done on the assembly output.
453 Common Report Var(flag_no_function_cse,0)
454 Allow function addresses to be held in registers
457 Common Report Var(flag_function_sections)
458 Place each function into its own section
461 Common Report Var(flag_gcse)
462 Perform global common subexpression elimination
465 Common Report Var(flag_gcse_lm) Init(1)
466 Perform enhanced load motion during global common subexpression elimination
469 Common Report Var(flag_gcse_sm) Init(0)
470 Perform store motion after global common subexpression elimination
473 Common Report Var(flag_gcse_las) Init(0)
474 Perform redundant load after store elimination in global common subexpression
478 Common Report Var(flag_gcse_after_reload)
479 Perform global common subexpression elimination after register allocation
482 fguess-branch-probability
483 Common Report Var(flag_guess_branch_prob)
484 Enable guessing of branch probabilities
486 ; Nonzero means ignore `#ident' directives. 0 means handle them.
487 ; Generate position-independent code for executables if possible
488 ; On SVR4 targets, it also controls whether or not to emit a
489 ; string identifying the compiler.
491 Common Report Var(flag_no_ident,0)
492 Process #ident directives
495 Common Report Var(flag_if_conversion)
496 Perform conversion of conditional jumps to branchless equivalents
499 Common Report Var(flag_if_conversion2)
500 Perform conversion of conditional jumps to conditional execution
502 ; -finhibit-size-directive inhibits output of .size for ELF.
503 ; This is used only for compiling crtstuff.c,
504 ; and it may be extended to other effects
505 ; needed for crtstuff.c on other systems.
506 finhibit-size-directive
507 Common Report Var(flag_inhibit_size_directive)
508 Do not generate .size directives
510 ; Nonzero means that functions declared `inline' will be treated
511 ; as `static'. Prevents generation of zillions of copies of unused
512 ; static inline functions; instead, `inlines' are written out
513 ; only when actually used. Used in conjunction with -g. Also
514 ; does the right thing with #pragma interface.
516 Common Report Var(flag_no_inline,0) Init(2)
517 Pay attention to the \"inline\" keyword
520 Common Report Var(flag_inline_functions)
521 Integrate simple functions into their callers
523 finline-functions-called-once
524 Common Report Var(flag_inline_functions_called_once) Init(1)
525 Integrate functions called once into their callers
528 Common RejectNegative Joined UInteger
531 Common RejectNegative Joined UInteger
532 -finline-limit=<number> Limit the size of inlined functions to <number>
534 finstrument-functions
535 Common Report Var(flag_instrument_function_entry_exit)
536 Instrument function entry and exit with profiling calls
539 Common Report Var(flag_ipa_cp)
540 Perform Interprocedural constant propagation
543 Common Report Var(flag_ipa_pure_const) Init(0)
544 Discover pure and const functions
547 Common Report Var(flag_ipa_pta) Init(0)
548 Perform interprocedural points-to analysis
551 Common Report Var(flag_ipa_reference) Init(0)
552 Discover readonly and non addressable static variables
555 Common Report Var(flag_ipa_type_escape) Init(0)
556 Type based escape and alias analysis
559 Common Report Var(flag_ivopts) Init(1)
560 Optimize induction variables on trees
563 Common Var(flag_jump_tables) Init(1)
564 Use jump tables for sufficiently large switch statements
566 fkeep-inline-functions
567 Common Report Var(flag_keep_inline_functions)
568 Generate code for functions even if they are fully inlined
571 Common Report Var(flag_keep_static_consts) Init(1)
572 Emit static const variables even if they are not used
575 Common Report Var(flag_leading_underscore) Init(-1)
576 Give external symbols a leading underscore
580 Does nothing. Preserved for backward compatibility.
583 Common Report Var(flag_errno_math) Init(1)
584 Set errno after built-in math functions
587 Common Report Var(mem_report)
588 Report on permanent memory allocation
590 ; This will attempt to merge constant section constants, if 1 only
591 ; string constants and constants from constant pool, if 2 also constant
594 Common Report Var(flag_merge_constants,2) Init(1)
595 Attempt to merge identical constants and constant variables
598 Common Report Var(flag_merge_constants,1) VarExists
599 Attempt to merge identical constants across compilation units
602 Common RejectNegative Joined UInteger
603 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
606 Common Report Var(flag_modulo_sched)
607 Perform SMS based modulo scheduling before the first scheduling pass
609 fmove-loop-invariants
610 Common Report Var(flag_move_loop_invariants) Init(1)
611 Move loop invariant computations out of loops
614 Common RejectNegative Report Var(flag_mudflap)
615 Add mudflap bounds-checking instrumentation for single-threaded program
618 Common RejectNegative Report VarExists Var(flag_mudflap,2)
619 Add mudflap bounds-checking instrumentation for multi-threaded program
622 Common RejectNegative Report Var(flag_mudflap_ignore_reads)
623 Ignore read operations when inserting mudflap instrumentation
625 freschedule-modulo-scheduled-loops
626 Common Report Var(flag_resched_modulo_sched)
627 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
630 Common Report Var(flag_non_call_exceptions)
631 Support synchronous non-call exceptions
634 Common Report Var(flag_omit_frame_pointer)
635 When possible do not generate stack frames
637 foptimize-register-move
638 Common Report Var(flag_regmove)
639 Do the full register move optimization pass
641 foptimize-sibling-calls
642 Common Report Var(flag_optimize_sibling_calls)
643 Optimize sibling and tail recursive calls
646 Common Report Var(pre_ipa_mem_report)
647 Report on memory allocation before interprocedural optimization
650 Common Report Var(post_ipa_mem_report)
651 Report on memory allocation before interprocedural optimization
654 Common Report Var(flag_pack_struct)
655 Pack structure members together without holes
658 Common RejectNegative Joined UInteger
659 -fpack-struct=<number> Set initial maximum structure member alignment
662 Common Report Var(flag_pcc_struct_return,1) VarExists
663 Return small aggregates in memory, not registers
666 Common Report Var(flag_peel_loops)
670 Common Report Var(flag_no_peephole,0)
671 Enable machine specific peephole optimizations
674 Common Report Var(flag_peephole2)
675 Enable an RTL peephole pass before sched2
678 Common Report Var(flag_pic,2)
679 Generate position-independent code if possible (large mode)
682 Common Report Var(flag_pie,2)
683 Generate position-independent code for executables if possible (large mode)
686 Common Report Var(flag_pic,1) VarExists
687 Generate position-independent code if possible (small mode)
690 Common Report Var(flag_pie,1) VarExists
691 Generate position-independent code for executables if possible (small mode)
693 fprefetch-loop-arrays
694 Common Report Var(flag_prefetch_loop_arrays)
695 Generate prefetch instructions, if available, for arrays in loops
698 Common Report Var(profile_flag)
699 Enable basic program profiling code
702 Common Report Var(profile_arc_flag)
703 Insert arc-based program profiling code
707 Enable common options for generating profile info for profile feedback directed optimizations
711 Enable common options for performing profile feedback directed optimizations
714 Common Report Var(flag_profile_values)
715 Insert code to profile values of expressions
721 Common Joined RejectNegative
722 -frandom-seed=<string> Make compile reproducible using <string>
724 ; This switch causes the command line that was used to create an
725 ; object file to be recorded into the object file. The exact format
726 ; of this recording is target and binary file format dependent.
727 ; It is related to the -fverbose-asm switch, but that switch only
728 ; records information in the assembler output file as comments, so
729 ; they never reach the object file.
731 Common Report Var(flag_record_gcc_switches)
732 Record gcc command line switches in the object file.
735 Common Report Var(flag_pcc_struct_return,0) VarExists
736 Return small aggregates in registers
739 Common Report Var(flag_regmove)
740 Enables a register move optimization
743 Common Report Var(flag_rename_registers) Init(2)
744 Perform a register renaming optimization pass
747 Common Report Var(flag_reorder_blocks)
748 Reorder basic blocks to improve code placement
750 freorder-blocks-and-partition
751 Common Report Var(flag_reorder_blocks_and_partition)
752 Reorder basic blocks and partition into hot and cold sections
755 Common Report Var(flag_reorder_functions)
756 Reorder functions to improve code placement
758 frerun-cse-after-loop
759 Common Report Var(flag_rerun_cse_after_loop) Init(2)
760 Add a common subexpression elimination pass after loop optimizations
764 Does nothing. Preserved for backward compatibility.
767 Common Report Var(flag_rounding_math)
768 Disable optimizations that assume default FP rounding behavior
771 Common Report Var(flag_schedule_interblock) Init(1)
772 Enable scheduling across basic blocks
775 Common Report Var(flag_schedule_speculative) Init(1)
776 Allow speculative motion of non-loads
779 Common Report Var(flag_schedule_speculative_load)
780 Allow speculative motion of some loads
782 fsched-spec-load-dangerous
783 Common Report Var(flag_schedule_speculative_load_dangerous)
784 Allow speculative motion of more loads
787 Common RejectNegative Joined
788 -fsched-verbose=<number> Set the verbosity level of the scheduler
790 fsched2-use-superblocks
791 Common Report Var(flag_sched2_use_superblocks)
792 If scheduling post reload, do superblock scheduling
795 Common Report Var(flag_sched2_use_traces)
796 If scheduling post reload, do trace scheduling
799 Common Report Var(flag_schedule_insns)
800 Reschedule instructions before register allocation
803 Common Report Var(flag_schedule_insns_after_reload)
804 Reschedule instructions after register allocation
806 ; sched_stalled_insns means that insns can be moved prematurely from the queue
807 ; of stalled insns into the ready list.
809 Common Report Var(flag_sched_stalled_insns)
810 Allow premature scheduling of queued insns
812 fsched-stalled-insns=
813 Common RejectNegative Joined UInteger
814 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
816 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
817 ; be examined for a dependency on a stalled insn that is candidate for
818 ; premature removal from the queue of stalled insns into the ready list (has
819 ; an effect only if the flag 'sched_stalled_insns' is set).
820 fsched-stalled-insns-dep
821 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1)
822 Set dependence distance checking in premature scheduling of queued insns
824 fsched-stalled-insns-dep=
825 Common RejectNegative Joined UInteger
826 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
829 Common Report Var(flag_section_anchors)
830 Access data in the same section from shared anchor points
832 frtl-abstract-sequences
833 Common Report Var(flag_rtl_seqabstr)
834 Perform sequence abstraction optimization on RTL
837 Common Report Var(flag_see) Init(0)
838 Eliminate redundant sign extensions using LCM.
841 Common C ObjC C++ ObjC++ Report Var(flag_show_column) Init(1)
842 Show column numbers in diagnostics, when available. Default on
845 Common Report Var(flag_signaling_nans)
846 Disable optimizations observable by IEEE signaling NaNs
849 Common Report Var(flag_signed_zeros) Init(1)
850 Disable floating point optimizations that ignore the IEEE signedness of zero
852 fsingle-precision-constant
853 Common Report Var(flag_single_precision_constant)
854 Convert floating point constants to single precision constants
856 fsplit-ivs-in-unroller
857 Common Report Var(flag_split_ivs_in_unroller) Init(1)
858 Split lifetimes of induction variables when loops are unrolled
860 fvariable-expansion-in-unroller
861 Common Report Var(flag_variable_expansion_in_unroller)
862 Apply variable expansion when loops are unrolled
864 ; Emit code to probe the stack, to help detect stack overflow; also
865 ; may cause large objects to be allocated dynamically.
867 Common Report Var(flag_stack_check)
868 Insert stack checking code into the program
873 fstack-limit-register=
874 Common RejectNegative Joined
875 -fstack-limit-register=<register> Trap if the stack goes past <register>
878 Common RejectNegative Joined
879 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
882 Common Report Var(flag_stack_protect, 1)
883 Use propolice as a stack protection method
886 Common Report RejectNegative Var(flag_stack_protect, 2) VarExists
887 Use a stack protection method for every function
891 Does nothing. Preserved for backward compatibility.
893 ; Nonzero if we should do (language-dependent) alias analysis.
894 ; Typically, this analysis will assume that expressions of certain
895 ; types do not alias expressions of certain other types. Only used
896 ; if alias analysis (in general) is enabled.
898 Common Report Var(flag_strict_aliasing)
899 Assume strict aliasing rules apply
902 Common Report Var(flag_syntax_only)
903 Check for syntax errors, then stop
906 Common Report Var(flag_test_coverage)
907 Create data files needed by \"gcov\"
910 Common Report Var(flag_thread_jumps)
911 Perform jump threading optimizations
914 Common Report Var(time_report)
915 Report the time taken by each compiler pass
918 Common Joined RejectNegative
919 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
922 Common Report Var(flag_toplevel_reorder) Init(1)
923 Reorder top level functions, variables, and asms
926 Common Report Var(flag_tracer)
927 Perform superblock formation via tail duplication
929 ; Zero means that floating-point math operations cannot generate a
930 ; (user-visible) trap. This is the case, for example, in nonstop
931 ; IEEE 754 arithmetic.
933 Common Report Var(flag_trapping_math) Init(1)
934 Assume floating-point operations can trap
937 Common Report Var(flag_trapv)
938 Trap for signed overflow in addition, subtraction and multiplication
941 Common Report Var(flag_tree_ccp)
942 Enable SSA-CCP optimization on trees
945 Common Report Var(flag_tree_store_ccp)
946 Enable SSA-CCP optimization for stores and loads
949 Common Report Var(flag_tree_ch)
950 Enable loop header copying on trees
953 Common Report Var(flag_tree_copyrename)
954 Replace SSA temporaries with better names in copies
957 Common Report Var(flag_tree_copy_prop)
958 Enable copy propagation on trees
960 ftree-store-copy-prop
961 Common Report Var(flag_tree_store_copy_prop)
962 Enable copy propagation for stores and loads
965 Common Report Var(flag_tree_dce)
966 Enable SSA dead code elimination optimization on trees
969 Common Report Var(flag_tree_dom)
970 Enable dominator optimizations
973 Common Report Var(flag_tree_dse)
974 Enable dead store elimination
977 Common Report Var(flag_tree_fre)
978 Enable Full Redundancy Elimination (FRE) on trees
981 Common Report Var(flag_tree_loop_im) Init(1)
982 Enable loop invariant motion on trees
985 Common Report Var(flag_tree_loop_linear)
986 Enable linear loop transforms on trees
989 Common Report Var(flag_tree_loop_ivcanon) Init(1)
990 Create canonical induction variables in loops
993 Common Report Var(flag_tree_loop_optimize) Init(1)
994 Enable loop optimizations on tree level
997 Common Report Var(flag_tree_pre)
998 Enable SSA-PRE optimization on trees
1001 Common Report Var(flag_tree_salias)
1002 Perform structural alias analysis
1005 Common Report Var(flag_tree_sink)
1006 Enable SSA code sinking on trees
1009 Common Report Var(flag_tree_sra)
1010 Perform scalar replacement of aggregates
1013 Common Report Var(flag_tree_ter)
1014 Replace temporary expressions in the SSA->normal pass
1017 Common Report Var(flag_tree_vrp) Init(0)
1018 Perform Value Range Propagation on trees
1021 Common Report Var(flag_unit_at_a_time)
1022 Compile whole compilation unit at a time
1025 Common Report Var(flag_unroll_loops)
1026 Perform loop unrolling when iteration count is known
1029 Common Report Var(flag_unroll_all_loops)
1030 Perform loop unrolling for all loops
1032 ; Nonzero means that loop optimizer may assume that the induction variables
1033 ; that control loops do not overflow and that the loops with nontrivial
1034 ; exit condition are not infinite
1035 funsafe-loop-optimizations
1036 Common Report Var(flag_unsafe_loop_optimizations)
1037 Allow loop optimizations to assume that the loops behave in normal way
1039 ; Nonzero means that unsafe floating-point math optimizations are allowed
1040 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
1041 ; are allowed to assume that their arguments and results are "normal"
1042 ; (e.g., nonnegative for SQRT).
1043 funsafe-math-optimizations
1044 Common Report Var(flag_unsafe_math_optimizations)
1045 Allow math optimizations that may violate IEEE or ISO standards
1048 Common Report Var(flag_unswitch_loops)
1049 Perform loop unswitching
1052 Common Report Var(flag_unwind_tables)
1053 Just generate unwind tables for exception handling
1056 Common Report Var(flag_var_tracking) VarExists
1057 Perform variable tracking
1060 Common Report Var(flag_tree_vectorize)
1061 Enable loop vectorization on trees
1063 ftree-vect-loop-version
1064 Common Report Var(flag_tree_vect_loop_version) Init(1)
1065 Enable loop versioning when doing loop vectorization on trees
1067 ftree-vectorizer-verbose=
1068 Common RejectNegative Joined
1069 -ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
1071 ; -fverbose-asm causes extra commentary information to be produced in
1072 ; the generated assembly code (to make it more readable). This option
1073 ; is generally only of use to those who actually need to read the
1074 ; generated assembly code (perhaps while debugging the compiler itself).
1075 ; -fno-verbose-asm, the default, causes the extra information
1076 ; to not be added and is useful when comparing two assembler files.
1078 Common Report Var(flag_verbose_asm)
1079 Add extra commentary to assembler output
1082 Common Joined RejectNegative
1083 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
1087 Common Report Var(flag_value_profile_transformations)
1088 Use expression value profiles in optimizations
1091 Common Report Var(flag_web) Init(2)
1092 Construct webs and split unrelated uses of single variable
1095 Common Report Var(flag_whole_program) Init(0)
1096 Perform whole program optimizations
1099 Common Report Var(flag_wrapv)
1100 Assume signed arithmetic overflow wraps around
1102 fzero-initialized-in-bss
1103 Common Report Var(flag_zero_initialized_in_bss) Init(1)
1104 Put zero initialized data in the bss section
1107 Common JoinedOrMissing
1108 Generate debug information in default format
1111 Common JoinedOrMissing Negative(gdwarf-2)
1112 Generate debug information in COFF format
1115 Common JoinedOrMissing Negative(gstabs)
1116 Generate debug information in DWARF v2 format
1119 Common JoinedOrMissing
1120 Generate debug information in default extended format
1123 Common JoinedOrMissing Negative(gstabs+)
1124 Generate debug information in STABS format
1127 Common JoinedOrMissing Negative(gvms)
1128 Generate debug information in extended STABS format
1131 Common JoinedOrMissing Negative(gxcoff)
1132 Generate debug information in VMS format
1135 Common JoinedOrMissing Negative(gxcoff+)
1136 Generate debug information in XCOFF format
1139 Common JoinedOrMissing Negative(gcoff)
1140 Generate debug information in extended XCOFF format
1143 Common Joined Separate
1144 -o <file> Place output into <file>
1147 Common Var(profile_flag)
1148 Enable function profiling
1151 Common Var(pedantic)
1152 Issue warnings needed for strict compliance to the standard
1156 Like -pedantic but issue them as errors
1159 Common Var(quiet_flag)
1160 Do not display functions compiled or elapsed time
1163 Common Var(version_flag)
1164 Display the compiler's version
1167 Common Var(inhibit_warnings)
1170 ; This comment is to ensure we retain the blank line above.