1 ; Options for the language- and target-independent parts of the compiler.
3 ; Copyright (C) 2003, 2004, 2005, 2006, 2007 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
201 Common RejectNegative Var(warn_coverage_mismatch)
202 Warn instead of error in case profiles in -fprofile-use do not match
206 -aux-info <file> Emit declaration information into <file>
219 -d<letters> Enable dumps from specific passes of the compiler
223 -dumpbase <file> Set the file basename to be used for dumps
225 ; The version of the C++ ABI in use. The following values are allowed:
227 ; 0: The version of the ABI believed most conformant with the C++ ABI
228 ; specification. This ABI may change as bugs are discovered and fixed.
229 ; Therefore, 0 will not necessarily indicate the same ABI in different
232 ; 1: The version of the ABI first used in G++ 3.2.
234 ; Additional positive integers will be assigned as new versions of
235 ; the ABI become the default version of the ABI.
237 Common Joined UInteger Var(flag_abi_version) Init(2)
240 Common Report Var(align_functions,0)
241 Align the start of functions
244 Common RejectNegative Joined UInteger
247 Common Report Var(align_jumps,0)
248 Align labels which are only reached by jumping
251 Common RejectNegative Joined UInteger
254 Common Report Var(align_labels,0)
258 Common RejectNegative Joined UInteger
261 Common Report Var(align_loops)
262 Align the start of loops
265 Common RejectNegative Joined UInteger
267 ; This flag is only tested if alias checking is enabled.
268 ; 0 if pointer arguments may alias each other. True in C.
269 ; 1 if pointer arguments may not alias each other but may alias
271 ; 2 if pointer arguments may not alias each other and may not
272 ; alias global variables.
273 ; 3 if pointer arguments may not alias anything. True in Fortran.
274 ; Set by the front end.
276 Common Report Var(flag_argument_noalias,0)
277 Specify that arguments may alias each other and globals
280 Common Report Var(flag_argument_noalias,1) VarExists
281 Assume arguments may alias globals but not each other
283 fargument-noalias-global
284 Common Report Var(flag_argument_noalias,2) VarExists
285 Assume arguments alias neither each other nor globals
287 fargument-noalias-anything
288 Common Report Var(flag_argument_noalias,3) VarExists
289 Assume arguments alias no other storage
291 fasynchronous-unwind-tables
292 Common Report Var(flag_asynchronous_unwind_tables)
293 Generate unwind tables that are exact at each instruction boundary
295 ; -fcheck-bounds causes gcc to generate array bounds checks.
296 ; For C, C++ and ObjC: defaults off.
297 ; For Java: defaults to on.
298 ; For Fortran: defaults to off.
300 Common Report Var(flag_bounds_check)
301 Generate code to check bounds before indexing arrays
304 Common Report Var(flag_branch_on_count_reg) Init(1)
305 Replace add, compare, branch with branch on count register
307 fbranch-probabilities
308 Common Report Var(flag_branch_probabilities)
309 Use profiling information for branch probabilities
311 fbranch-target-load-optimize
312 Common Report Var(flag_branch_target_load_optimize)
313 Perform branch target load optimization before prologue / epilogue threading
315 fbranch-target-load-optimize2
316 Common Report Var(flag_branch_target_load_optimize2)
317 Perform branch target load optimization after prologue / epilogue threading
320 Common Report Var(flag_btr_bb_exclusive)
321 Restrict target load migration not to re-use registers in any basic block
324 Common Joined RejectNegative
325 -fcall-saved-<register> Mark <register> as being preserved across functions
328 Common Joined RejectNegative
329 -fcall-used-<register> Mark <register> as being corrupted by function calls
331 ; Nonzero for -fcaller-saves: allocate values in regs that need to
332 ; be saved across function calls, if that produces overall better code.
333 ; Optional now, so people can test it.
335 Common Report Var(flag_caller_saves)
336 Save registers around function calls
339 Common Report Var(flag_no_common,0)
340 Do not put uninitialized globals in the common section
343 Common Report Var(flag_cprop_registers)
344 Perform a register copy-propagation optimization pass
347 Common Report Var(flag_crossjumping)
348 Perform cross-jumping optimization
351 Common Report Var(flag_cse_follow_jumps)
352 When running CSE, follow jumps to their targets
355 Common Report Var(flag_cse_skip_blocks)
356 When running CSE, follow conditional jumps
359 Common Report Var(flag_cx_limited_range)
360 Omit range reduction step when performing complex division
363 Common Report Var(flag_data_sections)
364 Place data items into their own section
366 ; Nonzero for -fdefer-pop: don't pop args after each function call
367 ; instead save them up to pop many calls' args with one insns.
369 Common Report Var(flag_defer_pop)
370 Defer popping functions args from stack until later
373 Common Report Var(flag_delayed_branch)
374 Attempt to fill delay slots of branch instructions
376 fdelete-null-pointer-checks
377 Common Report Var(flag_delete_null_pointer_checks)
378 Delete useless null pointer checks
380 fdiagnostics-show-location=
381 Common Joined RejectNegative
382 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
384 fdiagnostics-show-option
386 Amend appropriate diagnostic messages with the command line option that controls them
389 Common Joined RejectNegative
390 -fdump-<type> Dump various compiler internals to a file
393 Common Report Var(flag_dump_noaddr)
394 Suppress output of addresses in debugging dumps
397 Common Report Var(flag_dump_unnumbered) VarExists
398 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
401 Common Report Var(flag_early_inlining) Init(1)
402 Perform early inlining
404 feliminate-dwarf2-dups
405 Common Report Var(flag_eliminate_dwarf2_dups)
406 Perform DWARF2 duplicate elimination
408 feliminate-unused-debug-symbols
409 Common Report Var(flag_debug_only_used_symbols)
410 Perform unused type elimination in debug info
412 feliminate-unused-debug-types
413 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
414 Perform unused type elimination in debug info
416 femit-class-debug-always
417 Common Report Var(flag_emit_class_debug_always) Init(1)
418 Do not suppress C++ class debug information.
421 Common Report Var(flag_exceptions)
422 Enable exception handling
424 fexpensive-optimizations
425 Common Report Var(flag_expensive_optimizations)
426 Perform a number of minor, expensive optimizations
432 Common Report Var(flag_finite_math_only)
433 Assume no NaNs or infinities are generated
436 Common Joined RejectNegative
437 -ffixed-<register> Mark <register> as being unavailable to the compiler
440 Common Report Var(flag_float_store)
441 Don't allocate floats and doubles in extended-precision registers
443 ; Nonzero for -fforce-addr: load memory address into a register before
444 ; reference to memory. This makes better cse but slower compilation.
446 Common Report Var(flag_force_addr)
447 Copy memory address constants into registers before use
450 Common Report Var(flag_forward_propagate)
451 Perform a forward propagation pass on RTL
453 ; Nonzero means don't put addresses of constant functions in registers.
454 ; Used for compiling the Unix kernel, where strange substitutions are
455 ; done on the assembly output.
457 Common Report Var(flag_no_function_cse,0)
458 Allow function addresses to be held in registers
461 Common Report Var(flag_function_sections)
462 Place each function into its own section
465 Common Report Var(flag_gcse)
466 Perform global common subexpression elimination
469 Common Report Var(flag_gcse_lm) Init(1)
470 Perform enhanced load motion during global common subexpression elimination
473 Common Report Var(flag_gcse_sm) Init(0)
474 Perform store motion after global common subexpression elimination
477 Common Report Var(flag_gcse_las) Init(0)
478 Perform redundant load after store elimination in global common subexpression
482 Common Report Var(flag_gcse_after_reload)
483 Perform global common subexpression elimination after register allocation
486 fguess-branch-probability
487 Common Report Var(flag_guess_branch_prob)
488 Enable guessing of branch probabilities
490 ; Nonzero means ignore `#ident' directives. 0 means handle them.
491 ; Generate position-independent code for executables if possible
492 ; On SVR4 targets, it also controls whether or not to emit a
493 ; string identifying the compiler.
495 Common Report Var(flag_no_ident,0)
496 Process #ident directives
499 Common Report Var(flag_if_conversion)
500 Perform conversion of conditional jumps to branchless equivalents
503 Common Report Var(flag_if_conversion2)
504 Perform conversion of conditional jumps to conditional execution
506 ; -finhibit-size-directive inhibits output of .size for ELF.
507 ; This is used only for compiling crtstuff.c,
508 ; and it may be extended to other effects
509 ; needed for crtstuff.c on other systems.
510 finhibit-size-directive
511 Common Report Var(flag_inhibit_size_directive)
512 Do not generate .size directives
514 ; Nonzero means that functions declared `inline' will be treated
515 ; as `static'. Prevents generation of zillions of copies of unused
516 ; static inline functions; instead, `inlines' are written out
517 ; only when actually used. Used in conjunction with -g. Also
518 ; does the right thing with #pragma interface.
520 Common Report Var(flag_no_inline,0) Init(2)
521 Pay attention to the \"inline\" keyword
524 Common Report Var(flag_inline_functions)
525 Integrate simple functions into their callers
527 finline-functions-called-once
528 Common Report Var(flag_inline_functions_called_once) Init(1)
529 Integrate functions called once into their callers
532 Common RejectNegative Joined UInteger
535 Common RejectNegative Joined UInteger
536 -finline-limit=<number> Limit the size of inlined functions to <number>
538 finstrument-functions
539 Common Report Var(flag_instrument_function_entry_exit)
540 Instrument function entry and exit with profiling calls
543 Common Report Var(flag_ipa_cp)
544 Perform Interprocedural constant propagation
547 Common Report Var(flag_ipa_pure_const) Init(0)
548 Discover pure and const functions
551 Common Report Var(flag_ipa_pta) Init(0)
552 Perform interprocedural points-to analysis
555 Common Report Var(flag_ipa_reference) Init(0)
556 Discover readonly and non addressable static variables
559 Common Report Var(flag_ipa_type_escape) Init(0)
560 Type based escape and alias analysis
563 Common Report Var(flag_ivopts) Init(1)
564 Optimize induction variables on trees
567 Common Var(flag_jump_tables) Init(1)
568 Use jump tables for sufficiently large switch statements
570 fkeep-inline-functions
571 Common Report Var(flag_keep_inline_functions)
572 Generate code for functions even if they are fully inlined
575 Common Report Var(flag_keep_static_consts) Init(1)
576 Emit static const variables even if they are not used
579 Common Report Var(flag_leading_underscore) Init(-1)
580 Give external symbols a leading underscore
584 Does nothing. Preserved for backward compatibility.
587 Common Report Var(flag_errno_math) Init(1)
588 Set errno after built-in math functions
591 Common Report Var(mem_report)
592 Report on permanent memory allocation
594 ; This will attempt to merge constant section constants, if 1 only
595 ; string constants and constants from constant pool, if 2 also constant
598 Common Report Var(flag_merge_constants,2) Init(1)
599 Attempt to merge identical constants and constant variables
602 Common Report Var(flag_merge_constants,1) VarExists
603 Attempt to merge identical constants across compilation units
606 Common RejectNegative Joined UInteger
607 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
610 Common Report Var(flag_modulo_sched)
611 Perform SMS based modulo scheduling before the first scheduling pass
613 fmove-loop-invariants
614 Common Report Var(flag_move_loop_invariants) Init(1)
615 Move loop invariant computations out of loops
618 Common RejectNegative Report Var(flag_mudflap)
619 Add mudflap bounds-checking instrumentation for single-threaded program
622 Common RejectNegative Report VarExists Var(flag_mudflap,2)
623 Add mudflap bounds-checking instrumentation for multi-threaded program
626 Common RejectNegative Report Var(flag_mudflap_ignore_reads)
627 Ignore read operations when inserting mudflap instrumentation
629 freschedule-modulo-scheduled-loops
630 Common Report Var(flag_resched_modulo_sched)
631 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
634 Common Report Var(flag_non_call_exceptions)
635 Support synchronous non-call exceptions
638 Common Report Var(flag_omit_frame_pointer)
639 When possible do not generate stack frames
641 foptimize-register-move
642 Common Report Var(flag_regmove)
643 Do the full register move optimization pass
645 foptimize-sibling-calls
646 Common Report Var(flag_optimize_sibling_calls)
647 Optimize sibling and tail recursive calls
650 Common Report Var(pre_ipa_mem_report)
651 Report on memory allocation before interprocedural optimization
654 Common Report Var(post_ipa_mem_report)
655 Report on memory allocation before interprocedural optimization
658 Common Report Var(flag_pack_struct)
659 Pack structure members together without holes
662 Common RejectNegative Joined UInteger
663 -fpack-struct=<number> Set initial maximum structure member alignment
666 Common Report Var(flag_pcc_struct_return,1) VarExists
667 Return small aggregates in memory, not registers
670 Common Report Var(flag_peel_loops)
674 Common Report Var(flag_no_peephole,0)
675 Enable machine specific peephole optimizations
678 Common Report Var(flag_peephole2)
679 Enable an RTL peephole pass before sched2
682 Common Report Var(flag_pic,2)
683 Generate position-independent code if possible (large mode)
686 Common Report Var(flag_pie,2)
687 Generate position-independent code for executables if possible (large mode)
690 Common Report Var(flag_pic,1) VarExists
691 Generate position-independent code if possible (small mode)
694 Common Report Var(flag_pie,1) VarExists
695 Generate position-independent code for executables if possible (small mode)
697 fprefetch-loop-arrays
698 Common Report Var(flag_prefetch_loop_arrays)
699 Generate prefetch instructions, if available, for arrays in loops
702 Common Report Var(profile_flag)
703 Enable basic program profiling code
706 Common Report Var(profile_arc_flag)
707 Insert arc-based program profiling code
711 Enable common options for generating profile info for profile feedback directed optimizations
715 Enable common options for performing profile feedback directed optimizations
718 Common Report Var(flag_profile_values)
719 Insert code to profile values of expressions
725 Common Joined RejectNegative
726 -frandom-seed=<string> Make compile reproducible using <string>
728 ; This switch causes the command line that was used to create an
729 ; object file to be recorded into the object file. The exact format
730 ; of this recording is target and binary file format dependent.
731 ; It is related to the -fverbose-asm switch, but that switch only
732 ; records information in the assembler output file as comments, so
733 ; they never reach the object file.
735 Common Report Var(flag_record_gcc_switches)
736 Record gcc command line switches in the object file.
739 Common Report Var(flag_pcc_struct_return,0) VarExists
740 Return small aggregates in registers
743 Common Report Var(flag_regmove)
744 Enables a register move optimization
747 Common Report Var(flag_rename_registers) Init(2)
748 Perform a register renaming optimization pass
751 Common Report Var(flag_reorder_blocks)
752 Reorder basic blocks to improve code placement
754 freorder-blocks-and-partition
755 Common Report Var(flag_reorder_blocks_and_partition)
756 Reorder basic blocks and partition into hot and cold sections
759 Common Report Var(flag_reorder_functions)
760 Reorder functions to improve code placement
762 frerun-cse-after-loop
763 Common Report Var(flag_rerun_cse_after_loop) Init(2)
764 Add a common subexpression elimination pass after loop optimizations
768 Does nothing. Preserved for backward compatibility.
771 Common Report Var(flag_rounding_math)
772 Disable optimizations that assume default FP rounding behavior
775 Common Report Var(flag_schedule_interblock) Init(1)
776 Enable scheduling across basic blocks
779 Common Report Var(flag_schedule_speculative) Init(1)
780 Allow speculative motion of non-loads
783 Common Report Var(flag_schedule_speculative_load)
784 Allow speculative motion of some loads
786 fsched-spec-load-dangerous
787 Common Report Var(flag_schedule_speculative_load_dangerous)
788 Allow speculative motion of more loads
791 Common RejectNegative Joined
792 -fsched-verbose=<number> Set the verbosity level of the scheduler
794 fsched2-use-superblocks
795 Common Report Var(flag_sched2_use_superblocks)
796 If scheduling post reload, do superblock scheduling
799 Common Report Var(flag_sched2_use_traces)
800 If scheduling post reload, do trace scheduling
803 Common Report Var(flag_schedule_insns)
804 Reschedule instructions before register allocation
807 Common Report Var(flag_schedule_insns_after_reload)
808 Reschedule instructions after register allocation
810 ; sched_stalled_insns means that insns can be moved prematurely from the queue
811 ; of stalled insns into the ready list.
813 Common Report Var(flag_sched_stalled_insns)
814 Allow premature scheduling of queued insns
816 fsched-stalled-insns=
817 Common RejectNegative Joined UInteger
818 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
820 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
821 ; be examined for a dependency on a stalled insn that is candidate for
822 ; premature removal from the queue of stalled insns into the ready list (has
823 ; an effect only if the flag 'sched_stalled_insns' is set).
824 fsched-stalled-insns-dep
825 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1)
826 Set dependence distance checking in premature scheduling of queued insns
828 fsched-stalled-insns-dep=
829 Common RejectNegative Joined UInteger
830 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
833 Common Report Var(flag_section_anchors)
834 Access data in the same section from shared anchor points
836 frtl-abstract-sequences
837 Common Report Var(flag_rtl_seqabstr)
838 Perform sequence abstraction optimization on RTL
841 Common Report Var(flag_see) Init(0)
842 Eliminate redundant sign extensions using LCM.
845 Common C ObjC C++ ObjC++ Report Var(flag_show_column) Init(1)
846 Show column numbers in diagnostics, when available. Default on
849 Common Report Var(flag_signaling_nans)
850 Disable optimizations observable by IEEE signaling NaNs
853 Common Report Var(flag_signed_zeros) Init(1)
854 Disable floating point optimizations that ignore the IEEE signedness of zero
856 fsingle-precision-constant
857 Common Report Var(flag_single_precision_constant)
858 Convert floating point constants to single precision constants
860 fsplit-ivs-in-unroller
861 Common Report Var(flag_split_ivs_in_unroller) Init(1)
862 Split lifetimes of induction variables when loops are unrolled
865 Common Report Var(flag_split_wide_types)
866 Split wide types into independent registers
868 fvariable-expansion-in-unroller
869 Common Report Var(flag_variable_expansion_in_unroller)
870 Apply variable expansion when loops are unrolled
872 ; Emit code to probe the stack, to help detect stack overflow; also
873 ; may cause large objects to be allocated dynamically.
875 Common Report Var(flag_stack_check)
876 Insert stack checking code into the program
881 fstack-limit-register=
882 Common RejectNegative Joined
883 -fstack-limit-register=<register> Trap if the stack goes past <register>
886 Common RejectNegative Joined
887 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
890 Common Report Var(flag_stack_protect, 1)
891 Use propolice as a stack protection method
894 Common Report RejectNegative Var(flag_stack_protect, 2) VarExists
895 Use a stack protection method for every function
899 Does nothing. Preserved for backward compatibility.
901 ; Nonzero if we should do (language-dependent) alias analysis.
902 ; Typically, this analysis will assume that expressions of certain
903 ; types do not alias expressions of certain other types. Only used
904 ; if alias analysis (in general) is enabled.
906 Common Report Var(flag_strict_aliasing)
907 Assume strict aliasing rules apply
910 Common Report Var(flag_strict_overflow)
911 Treat signed overflow as undefined
914 Common Report Var(flag_syntax_only)
915 Check for syntax errors, then stop
918 Common Report Var(flag_test_coverage)
919 Create data files needed by \"gcov\"
922 Common Report Var(flag_thread_jumps)
923 Perform jump threading optimizations
926 Common Report Var(time_report)
927 Report the time taken by each compiler pass
930 Common Joined RejectNegative
931 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
934 Common Report Var(flag_toplevel_reorder) Init(1)
935 Reorder top level functions, variables, and asms
938 Common Report Var(flag_tracer)
939 Perform superblock formation via tail duplication
941 ; Zero means that floating-point math operations cannot generate a
942 ; (user-visible) trap. This is the case, for example, in nonstop
943 ; IEEE 754 arithmetic.
945 Common Report Var(flag_trapping_math) Init(1)
946 Assume floating-point operations can trap
949 Common Report Var(flag_trapv)
950 Trap for signed overflow in addition, subtraction and multiplication
953 Common Report Var(flag_tree_ccp)
954 Enable SSA-CCP optimization on trees
957 Common Report Var(flag_tree_store_ccp)
958 Enable SSA-CCP optimization for stores and loads
961 Common Report Var(flag_tree_ch)
962 Enable loop header copying on trees
965 Common Report Var(flag_tree_copyrename)
966 Replace SSA temporaries with better names in copies
969 Common Report Var(flag_tree_copy_prop)
970 Enable copy propagation on trees
972 ftree-store-copy-prop
973 Common Report Var(flag_tree_store_copy_prop)
974 Enable copy propagation for stores and loads
977 Common Report Var(flag_tree_dce)
978 Enable SSA dead code elimination optimization on trees
981 Common Report Var(flag_tree_dom)
982 Enable dominator optimizations
985 Common Report Var(flag_tree_dse)
986 Enable dead store elimination
989 Common Report Var(flag_tree_fre)
990 Enable Full Redundancy Elimination (FRE) on trees
993 Common Report Var(flag_tree_loop_im) Init(1)
994 Enable loop invariant motion on trees
997 Common Report Var(flag_tree_loop_linear)
998 Enable linear loop transforms on trees
1001 Common Report Var(flag_tree_loop_ivcanon) Init(1)
1002 Create canonical induction variables in loops
1005 Common Report Var(flag_tree_loop_optimize) Init(1)
1006 Enable loop optimizations on tree level
1009 Common Report Var(flag_tree_pre)
1010 Enable SSA-PRE optimization on trees
1013 Common Report Var(flag_tree_salias)
1014 Perform structural alias analysis
1017 Common Report Var(flag_tree_sink)
1018 Enable SSA code sinking on trees
1021 Common Report Var(flag_tree_sra)
1022 Perform scalar replacement of aggregates
1025 Common Report Var(flag_tree_ter)
1026 Replace temporary expressions in the SSA->normal pass
1029 Common Report Var(flag_tree_vrp) Init(0)
1030 Perform Value Range Propagation on trees
1033 Common Report Var(flag_unit_at_a_time)
1034 Compile whole compilation unit at a time
1037 Common Report Var(flag_unroll_loops)
1038 Perform loop unrolling when iteration count is known
1041 Common Report Var(flag_unroll_all_loops)
1042 Perform loop unrolling for all loops
1044 ; Nonzero means that loop optimizer may assume that the induction variables
1045 ; that control loops do not overflow and that the loops with nontrivial
1046 ; exit condition are not infinite
1047 funsafe-loop-optimizations
1048 Common Report Var(flag_unsafe_loop_optimizations)
1049 Allow loop optimizations to assume that the loops behave in normal way
1051 ; Nonzero means that unsafe floating-point math optimizations are allowed
1052 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
1053 ; are allowed to assume that their arguments and results are "normal"
1054 ; (e.g., nonnegative for SQRT).
1055 funsafe-math-optimizations
1056 Common Report Var(flag_unsafe_math_optimizations)
1057 Allow math optimizations that may violate IEEE or ISO standards
1060 Common Report Var(flag_unswitch_loops)
1061 Perform loop unswitching
1064 Common Report Var(flag_unwind_tables)
1065 Just generate unwind tables for exception handling
1068 Common Report Var(flag_var_tracking) VarExists
1069 Perform variable tracking
1072 Common Report Var(flag_tree_vectorize)
1073 Enable loop vectorization on trees
1075 ftree-vect-loop-version
1076 Common Report Var(flag_tree_vect_loop_version) Init(1)
1077 Enable loop versioning when doing loop vectorization on trees
1079 ftree-vectorizer-verbose=
1080 Common RejectNegative Joined
1081 -ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
1083 ; -fverbose-asm causes extra commentary information to be produced in
1084 ; the generated assembly code (to make it more readable). This option
1085 ; is generally only of use to those who actually need to read the
1086 ; generated assembly code (perhaps while debugging the compiler itself).
1087 ; -fno-verbose-asm, the default, causes the extra information
1088 ; to not be added and is useful when comparing two assembler files.
1090 Common Report Var(flag_verbose_asm)
1091 Add extra commentary to assembler output
1094 Common Joined RejectNegative
1095 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
1099 Common Report Var(flag_value_profile_transformations)
1100 Use expression value profiles in optimizations
1103 Common Report Var(flag_web) Init(2)
1104 Construct webs and split unrelated uses of single variable
1107 Common Report Var(flag_whole_program) Init(0)
1108 Perform whole program optimizations
1111 Common Report Var(flag_wrapv)
1112 Assume signed arithmetic overflow wraps around
1114 fzero-initialized-in-bss
1115 Common Report Var(flag_zero_initialized_in_bss) Init(1)
1116 Put zero initialized data in the bss section
1119 Common JoinedOrMissing
1120 Generate debug information in default format
1123 Common JoinedOrMissing Negative(gdwarf-2)
1124 Generate debug information in COFF format
1127 Common JoinedOrMissing Negative(gstabs)
1128 Generate debug information in DWARF v2 format
1131 Common JoinedOrMissing
1132 Generate debug information in default extended format
1135 Common JoinedOrMissing Negative(gstabs+)
1136 Generate debug information in STABS format
1139 Common JoinedOrMissing Negative(gvms)
1140 Generate debug information in extended STABS format
1143 Common JoinedOrMissing Negative(gxcoff)
1144 Generate debug information in VMS format
1147 Common JoinedOrMissing Negative(gxcoff+)
1148 Generate debug information in XCOFF format
1151 Common JoinedOrMissing Negative(gcoff)
1152 Generate debug information in extended XCOFF format
1155 Common Joined Separate
1156 -o <file> Place output into <file>
1159 Common Var(profile_flag)
1160 Enable function profiling
1163 Common Var(pedantic)
1164 Issue warnings needed for strict compliance to the standard
1168 Like -pedantic but issue them as errors
1171 Common Var(quiet_flag)
1172 Do not display functions compiled or elapsed time
1175 Common Var(version_flag)
1176 Display the compiler's version
1179 Common Var(inhibit_warnings)
1182 ; This comment is to ensure we retain the blank line above.