1 ; Options for the language- and target-independent parts of the compiler.
3 ; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4 ; Free Software Foundation, Inc.
6 ; This file is part of GCC.
8 ; GCC is free software; you can redistribute it and/or modify it under
9 ; the terms of the GNU General Public License as published by the Free
10 ; Software Foundation; either version 3, or (at your option) any later
13 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 ; You should have received a copy of the GNU General Public License
19 ; along with GCC; see the file COPYING3. If not see
20 ; <http://www.gnu.org/licenses/>.
22 ; See the GCC internals manual (options.texi) for a description of this file's format.
24 ; Please try to keep this file in ASCII collating order.
35 ; 0 means straightforward implementation of complex divide acceptable.
36 ; 1 means wide ranges of inputs must work for complex divide.
37 ; 2 means C99-like requirements for complex multiply and divide.
39 int flag_complex_method = 1
41 ; Nonzero if subexpressions must be evaluated from left-to-right.
43 int flag_evaluation_order = 0
45 ; Set the default region and algorithm for the integrated register
49 enum ira_algorithm flag_ira_algorithm = IRA_ALGORITHM_CB
52 enum ira_region flag_ira_region = IRA_REGION_MIXED
54 ; Language specific warning pass for unused results.
56 bool flag_warn_unused_result = false
61 ; Floating-point contraction mode, fast by default.
63 enum fp_contract_mode flag_fp_contract_mode = FP_CONTRACT_FAST
65 ; The excess precision specified on the command line, or defaulted by
68 enum excess_precision flag_excess_precision_cmdline = EXCESS_PRECISION_DEFAULT
70 ; Nonzero if we should write GIMPLE bytecode for link-time optimization.
74 ; True to warn about any objects definitions whose size is larger
75 ; than N bytes. Also want about function definitions whose returned
76 ; values are larger than N bytes, where N is 'larger_than_size'.
81 HOST_WIDE_INT larger_than_size
83 ; True to warn about any function whose frame size is larger
86 bool warn_frame_larger_than
89 HOST_WIDE_INT frame_larger_than_size
91 ; Nonzero means we should be saving declaration info into a .X file.
93 int flag_gen_aux_info = 0
95 ; Nonzero if we are compiling code for a shared library, zero for
100 ; The default visibility for all symbols (unless overridden).
102 enum symbol_visibility default_visibility = VISIBILITY_DEFAULT
104 ; Set to the default thread-local storage (tls) model to use.
106 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC
118 Driver Alias(coverage)
124 Common Separate Alias(d)
127 Common Joined Alias(d)
130 Common Separate Alias(dumpbase)
133 Common Separate Alias(dumpdir)
136 Driver Separate Alias(e)
139 Driver Joined Alias(e)
142 Common Warning Alias(Wextra)
145 Driver Separate Alias(Xassembler)
148 Driver JoinedOrMissing Alias(Xassembler)
151 Driver Separate Alias(Xlinker)
154 Driver JoinedOrMissing Alias(Xlinker)
157 Driver Separate Alias(u)
160 Driver Joined Alias(u)
163 Common Driver Var(help_flag)
164 Display this information
167 Common Driver Report Joined
168 --help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params
171 Driver Separate Alias(x)
174 Driver Joined Alias(x)
177 Driver Separate Alias(L)
180 Driver Joined Alias(L)
182 -no-canonical-prefixes
183 Driver Alias(no-canonical-prefixes)
185 -no-standard-libraries
186 Driver Alias(nostdlib)
195 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
198 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
201 Driver Alias(pass-exit-codes)
204 Common Alias(pedantic)
207 Common Alias(pedantic-errors)
216 Driver Separate Alias(B)
219 Driver JoinedOrMissing Alias(B)
225 Driver Separate Alias(print-file-name=)
228 Driver JoinedOrMissing Alias(print-file-name=)
230 -print-libgcc-file-name
231 Driver Alias(print-libgcc-file-name)
233 -print-multi-directory
234 Driver Alias(print-multi-directory)
237 Driver Alias(print-multi-lib)
239 -print-multi-os-directory
240 Driver Alias(print-multi-os-directory)
243 Driver Separate Alias(print-prog-name=)
246 Driver JoinedOrMissing Alias(print-prog-name=)
249 Driver Alias(print-search-dirs)
252 Driver Alias(print-sysroot)
254 -print-sysroot-headers-suffix
255 Driver Alias(print-sysroot-headers-suffix)
261 Driver Alias(save-temps)
267 Driver Separate Alias(specs=)
270 Driver Joined Alias(specs=)
276 Driver Alias(symbolic)
280 Alias for --help=target
288 ;; The driver used to convert options such as --help into forms such
289 ;; as -fhelp; the following four entries are for compatibility with
290 ;; any direct uses of those (undocumented) -f forms
292 Common Driver Alias(-help)
295 Common Driver Joined Alias(-help=)
298 Common Driver Alias(-target-help)
301 Common Driver Alias(-version)
305 --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
308 Common Joined Alias(-param)
311 Driver Separate Alias(-sysroot=)
314 Driver JoinedOrMissing
320 Driver Joined Separate
326 Driver Joined Separate
329 Common JoinedOrMissing Optimization
330 -O<number> Set optimization level to <number>
334 Optimize for space rather than speed
338 Optimize for speed disregarding exact standards compliance
341 Driver Joined Separate
347 Driver Joined Separate
359 Common RejectNegative Warning Alias(Wextra)
360 This switch is deprecated; use -Wextra instead
363 Driver JoinedOrMissing
366 Driver JoinedOrMissing
369 Driver JoinedOrMissing
372 Common Var(warn_aggregate_return) Warning
373 Warn about returning structures, unions or arrays
376 Common Var(warn_array_bounds) Warning
377 Warn if an array is accessed out of bounds
380 Common Var(warn_attributes) Init(1) Warning
381 Warn about inappropriate attribute usage
384 Common Var(warn_cast_align) Warning
385 Warn about pointer casts which increase alignment
388 Common Var(warn_cpp) Init(1) Warning
389 Warn when a #warning directive is encountered
391 Wdeprecated-declarations
392 Common Var(warn_deprecated_decl) Init(1) Warning
393 Warn about uses of __attribute__((deprecated)) declarations
395 Wdisabled-optimization
396 Common Var(warn_disabled_optimization) Warning
397 Warn when an optimization pass is disabled
400 Common Var(warnings_are_errors)
401 Treat all warnings as errors
405 Treat specified warning as error
408 Common Var(extra_warnings) Warning
409 Print extra (possibly unwanted) warnings
412 Common Var(flag_fatal_errors)
413 Exit on the first error occurred
416 Common RejectNegative Joined UInteger
417 -Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
420 Common Var(warn_inline) Warning
421 Warn when an inlined function cannot be inlined
424 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
427 Common RejectNegative Joined UInteger Warning
428 -Wlarger-than=<number> Warn if an object is larger than <number> bytes
430 Wunsafe-loop-optimizations
431 Common Var(warn_unsafe_loop_optimizations) Warning
432 Warn if the loop cannot be optimized due to nontrivial assumptions.
435 Common Var(warn_missing_noreturn) Warning
436 Warn about functions which might be candidates for __attribute__((noreturn))
439 Common Var(warn_mudflap) Init(1) Warning
440 Warn about constructs not instrumented by -fmudflap
443 Common Var(warn_overflow) Init(1) Warning
444 Warn about overflow in arithmetic expressions
447 Common Var(warn_packed) Warning
448 Warn when the packed attribute has no effect on struct layout
451 Common Var(warn_padded) Warning
452 Warn when padding is required to align structure members
455 Common Var(warn_shadow) Warning
456 Warn when one local variable shadows another
459 Common Var(warn_stack_protect) Warning
460 Warn when not issuing stack smashing protection for some reason
464 Warn about code which might break strict aliasing rules
467 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Init(-1) Warning
468 Warn about code which might break strict aliasing rules
472 Warn about optimizations that assume that signed overflow is undefined
475 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Init(-1) Warning
476 Warn about optimizations that assume that signed overflow is undefined
478 Wsuggest-attribute=const
479 Common Var(warn_suggest_attribute_const) Warning
480 Warn about functions which might be candidates for __attribute__((const))
482 Wsuggest-attribute=pure
483 Common Var(warn_suggest_attribute_pure) Warning
484 Warn about functions which might be candidates for __attribute__((pure))
486 Wsuggest-attribute=noreturn
487 Common Var(warn_suggest_attribute_noreturn) Warning
488 Warn about functions which might be candidates for __attribute__((noreturn))
491 Common Var(warn_switch) Warning
492 Warn about enumerated switches, with no default, missing a case
495 Common Var(warn_switch_default) Warning
496 Warn about enumerated switches missing a \"default:\" statement
499 Common Var(warn_switch_enum) Warning
500 Warn about all enumerated switches missing a specific case
503 Common Var(warn_system_headers) Warning
504 Do not suppress warnings from system headers
507 Common Var(warn_trampolines) Warning
508 Warn whenever a trampoline is generated
511 Common Var(warn_type_limits) Init(-1) Warning
512 Warn if a comparison is always true or always false due to the limited range of the data type
515 Common Var(warn_uninitialized) Init(-1) Warning
516 Warn about uninitialized automatic variables
520 Does nothing. Preserved for backward compatibility.
523 Common Var(warn_unused) Init(0) Warning
524 Enable all -Wunused- warnings
526 Wunused-but-set-parameter
527 Common Var(warn_unused_but_set_parameter) Init(-1) Warning
528 Warn when a function parameter is only set, otherwise unused
530 Wunused-but-set-variable
531 Common Var(warn_unused_but_set_variable) Init(-1) Warning
532 Warn when a variable is only set, otherwise unused
535 Common Var(warn_unused_function) Init(-1) Warning
536 Warn when a function is unused
539 Common Var(warn_unused_label) Init(-1) Warning
540 Warn when a label is unused
543 Common Var(warn_unused_parameter) Init(-1) Warning
544 Warn when a function parameter is unused
547 Common Var(warn_unused_value) Init(-1) Warning
548 Warn when an expression value is unused
551 Common Var(warn_unused_variable) Init(-1) Warning
552 Warn when a variable is unused
555 Common Var(warn_coverage_mismatch) Init(1) Warning
556 Warn in case profiles in -fprofile-use do not match
568 Common Separate Var(aux_info_file_name)
569 -aux-info <file> Emit declaration information into <file>
572 Common Joined Alias(aux-info)
575 Common Separate RejectDriver Var(aux_base_name)
578 Common Separate RejectDriver
588 -d<letters> Enable dumps from specific passes of the compiler
591 Common Separate Var(dump_base_name)
592 -dumpbase <file> Set the file basename to be used for dumps
595 Common Separate Var(dump_dir_name)
596 -dumpdir <dir> Set the directory name to be used for dumps
608 Driver Joined Separate
610 ; The version of the C++ ABI in use. The following values are allowed:
612 ; 0: The version of the ABI believed most conformant with the C++ ABI
613 ; specification. This ABI may change as bugs are discovered and fixed.
614 ; Therefore, 0 will not necessarily indicate the same ABI in different
617 ; 1: The version of the ABI first used in G++ 3.2.
619 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
621 ; 3: The version of the ABI that fixes the missing underscore
622 ; in template non-type arguments of pointer type.
624 ; 4: The version of the ABI that introduces unambiguous mangling of
627 ; Additional positive integers will be assigned as new versions of
628 ; the ABI become the default version of the ABI.
630 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(2)
633 Common Report Var(align_functions,0) Optimization UInteger
634 Align the start of functions
637 Common RejectNegative Joined UInteger Var(align_functions)
640 Common Report Var(align_jumps,0) Optimization UInteger
641 Align labels which are only reached by jumping
644 Common RejectNegative Joined UInteger Var(align_jumps)
647 Common Report Var(align_labels,0) Optimization UInteger
651 Common RejectNegative Joined UInteger Var(align_labels)
654 Common Report Var(align_loops,0) Optimization UInteger
655 Align the start of loops
658 Common RejectNegative Joined UInteger Var(align_loops)
662 Does nothing. Preserved for backward compatibility.
666 Does nothing. Preserved for backward compatibility.
668 fargument-noalias-global
670 Does nothing. Preserved for backward compatibility.
672 fargument-noalias-anything
674 Does nothing. Preserved for backward compatibility.
676 fasynchronous-unwind-tables
677 Common Report Var(flag_asynchronous_unwind_tables) Optimization
678 Generate unwind tables that are exact at each instruction boundary
681 Common Report Var(flag_auto_inc_dec) Init(1)
682 Generate auto-inc/dec instructions
684 ; -fcheck-bounds causes gcc to generate array bounds checks.
685 ; For C, C++ and ObjC: defaults off.
686 ; For Java: defaults to on.
687 ; For Fortran: defaults to off.
689 Common Report Var(flag_bounds_check)
690 Generate code to check bounds before indexing arrays
693 Common Report Var(flag_branch_on_count_reg) Init(1) Optimization
694 Replace add, compare, branch with branch on count register
696 fbranch-probabilities
697 Common Report Var(flag_branch_probabilities) Optimization
698 Use profiling information for branch probabilities
700 fbranch-target-load-optimize
701 Common Report Var(flag_branch_target_load_optimize) Optimization
702 Perform branch target load optimization before prologue / epilogue threading
704 fbranch-target-load-optimize2
705 Common Report Var(flag_branch_target_load_optimize2) Optimization
706 Perform branch target load optimization after prologue / epilogue threading
709 Common Report Var(flag_btr_bb_exclusive) Optimization
710 Restrict target load migration not to re-use registers in any basic block
713 Common Joined RejectNegative
714 -fcall-saved-<register> Mark <register> as being preserved across functions
717 Common Joined RejectNegative
718 -fcall-used-<register> Mark <register> as being corrupted by function calls
720 ; Nonzero for -fcaller-saves: allocate values in regs that need to
721 ; be saved across function calls, if that produces overall better code.
722 ; Optional now, so people can test it.
724 Common Report Var(flag_caller_saves) Optimization
725 Save registers around function calls
728 Common Report Var(flag_check_data_deps)
729 Compare the results of several data dependence analyzers.
731 fcombine-stack-adjustments
732 Common Report Var(flag_combine_stack_adjustments) Optimization
733 Looks for opportunities to reduce stack adjustments and stack references.
736 Common Report Var(flag_no_common,0) Optimization
737 Do not put uninitialized globals in the common section
741 ; Converted by the driver to -fcompare-debug= options.
744 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
745 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
747 fcompare-debug-second
748 Common Driver RejectNegative
749 Run only the second compilation of -fcompare-debug
752 Common Var(flag_conserve_stack) Optimization
753 Do not perform optimizations increasing noticeably stack usage
756 Common Report Var(flag_cprop_registers) Optimization
757 Perform a register copy-propagation optimization pass
760 Common Report Var(flag_crossjumping) Optimization
761 Perform cross-jumping optimization
764 Common Report Var(flag_cse_follow_jumps) Optimization
765 When running CSE, follow jumps to their targets
769 Does nothing. Preserved for backward compatibility.
772 Common Report Var(flag_cx_limited_range) Optimization
773 Omit range reduction step when performing complex division
776 Common Report Var(flag_cx_fortran_rules) Optimization
777 Complex multiplication and division follow Fortran rules
780 Common Report Var(flag_data_sections) Optimization
781 Place data items into their own section
785 List all available debugging counters with their limits and counts.
788 Common RejectNegative Joined
789 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
792 Common Joined RejectNegative
793 Map one directory name to another in debug information
795 ; Nonzero for -fdefer-pop: don't pop args after each function call
796 ; instead save them up to pop many calls' args with one insns.
798 Common Report Var(flag_defer_pop) Optimization
799 Defer popping functions args from stack until later
802 Common Report Var(flag_delayed_branch) Optimization
803 Attempt to fill delay slots of branch instructions
805 fdelete-null-pointer-checks
806 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
807 Delete useless null pointer checks
809 fdiagnostics-show-location=
810 Common Joined RejectNegative
811 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
813 fdiagnostics-show-option
814 Common Var(flag_diagnostics_show_option) Init(1)
815 Amend appropriate diagnostic messages with the command line option that controls them
818 Common Joined RejectNegative
819 -fdump-<type> Dump various compiler internals to a file
822 Driver RejectNegative
825 Common RejectNegative Joined Var(flag_dump_final_insns)
826 -fdump-final-insns=filename Dump to filename the insns at the end of translation
829 Common Report Var(flag_dump_noaddr)
830 Suppress output of addresses in debugging dumps
833 Common Report Var(flag_dump_unnumbered)
834 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
836 fdump-unnumbered-links
837 Common Report Var(flag_dump_unnumbered_links)
838 Suppress output of previous and next insn numbers in debugging dumps
841 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
842 Enable CFI tables via GAS assembler directives.
845 Common Report Var(flag_early_inlining) Init(1) Optimization
846 Perform early inlining
848 feliminate-dwarf2-dups
849 Common Report Var(flag_eliminate_dwarf2_dups)
850 Perform DWARF2 duplicate elimination
853 Common Report Var(flag_ipa_sra) Init(0) Optimization
854 Perform interprocedural reduction of aggregates
856 feliminate-unused-debug-symbols
857 Common Report Var(flag_debug_only_used_symbols)
858 Perform unused type elimination in debug info
860 feliminate-unused-debug-types
861 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
862 Perform unused type elimination in debug info
864 femit-class-debug-always
865 Common Report Var(flag_emit_class_debug_always) Init(0)
866 Do not suppress C++ class debug information.
869 Common Report Var(flag_enable_icf_debug)
870 Generate debug information to support Identical Code Folding (ICF)
873 Common Report Var(flag_exceptions) Optimization
874 Enable exception handling
876 fexpensive-optimizations
877 Common Report Var(flag_expensive_optimizations) Optimization
878 Perform a number of minor, expensive optimizations
881 Common Joined RejectNegative
882 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
888 Common Report Var(flag_finite_math_only) Optimization
889 Assume no NaNs or infinities are generated
892 Common Joined RejectNegative
893 -ffixed-<register> Mark <register> as being unavailable to the compiler
896 Common Report Var(flag_float_store) Optimization
897 Don't allocate floats and doubles in extended-precision registers
901 Does nothing. Preserved for backward compatibility.
904 Common Report Var(flag_forward_propagate) Optimization
905 Perform a forward propagation pass on RTL
908 Common Joined RejectNegative
909 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
911 ; Nonzero means don't put addresses of constant functions in registers.
912 ; Used for compiling the Unix kernel, where strange substitutions are
913 ; done on the assembly output.
915 Common Report Var(flag_no_function_cse,0)
916 Allow function addresses to be held in registers
919 Common Report Var(flag_function_sections)
920 Place each function into its own section
923 Common Report Var(flag_gcse) Optimization
924 Perform global common subexpression elimination
927 Common Report Var(flag_gcse_lm) Init(1) Optimization
928 Perform enhanced load motion during global common subexpression elimination
931 Common Report Var(flag_gcse_sm) Init(0) Optimization
932 Perform store motion after global common subexpression elimination
935 Common Report Var(flag_gcse_las) Init(0) Optimization
936 Perform redundant load after store elimination in global common subexpression
940 Common Report Var(flag_gcse_after_reload) Optimization
941 Perform global common subexpression elimination after register allocation
944 ; This option is not documented yet as its semantics will change.
946 Common Report Var(flag_graphite)
947 Enable in and out of Graphite representation
950 Common Report Var(flag_graphite_identity) Optimization
951 Enable Graphite Identity transformation
953 floop-parallelize-all
954 Common Report Var(flag_loop_parallelize_all) Optimization
955 Mark all loops as parallel
958 Common Report Var(flag_loop_strip_mine) Optimization
959 Enable Loop Strip Mining transformation
962 Common Report Var(flag_loop_interchange) Optimization
963 Enable Loop Interchange transformation
966 Common Report Var(flag_loop_block) Optimization
967 Enable Loop Blocking transformation
970 Common Report Var(flag_loop_flatten) Optimization
971 Enable Loop Flattening transformation
973 fstrict-volatile-bitfields
974 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
975 Force bitfield accesses to match their type width
977 fguess-branch-probability
978 Common Report Var(flag_guess_branch_prob) Optimization
979 Enable guessing of branch probabilities
981 ; Nonzero means ignore `#ident' directives. 0 means handle them.
982 ; Generate position-independent code for executables if possible
983 ; On SVR4 targets, it also controls whether or not to emit a
984 ; string identifying the compiler.
986 Common Report Var(flag_no_ident,0)
987 Process #ident directives
990 Common Report Var(flag_if_conversion) Optimization
991 Perform conversion of conditional jumps to branchless equivalents
994 Common Report Var(flag_if_conversion2) Optimization
995 Perform conversion of conditional jumps to conditional execution
997 ftree-loop-if-convert
998 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
999 Convert conditional jumps in innermost loops to branchless equivalents
1001 ftree-loop-if-convert-stores
1002 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1003 Also if-convert conditional jumps containing memory writes
1005 ; -finhibit-size-directive inhibits output of .size for ELF.
1006 ; This is used only for compiling crtstuff.c,
1007 ; and it may be extended to other effects
1008 ; needed for crtstuff.c on other systems.
1009 finhibit-size-directive
1010 Common Report Var(flag_inhibit_size_directive)
1011 Do not generate .size directives
1014 Common Report Var(flag_indirect_inlining)
1015 Perform indirect inlining
1017 ; Nonzero means that functions declared `inline' will be treated
1018 ; as `static'. Prevents generation of zillions of copies of unused
1019 ; static inline functions; instead, `inlines' are written out
1020 ; only when actually used. Used in conjunction with -g. Also
1021 ; does the right thing with #pragma interface.
1023 Common Report Var(flag_no_inline,0) Init(0)
1024 Pay attention to the \"inline\" keyword
1026 finline-small-functions
1027 Common Report Var(flag_inline_small_functions) Optimization
1028 Integrate simple functions into their callers when code size is known to not growth
1031 Common Report Var(flag_inline_functions) Optimization
1032 Integrate simple functions into their callers
1034 finline-functions-called-once
1035 Common Report Var(flag_inline_functions_called_once) Init(1) Optimization
1036 Integrate functions called once into their callers
1039 Common RejectNegative Joined Alias(finline-limit=)
1042 Common RejectNegative Joined UInteger
1043 -finline-limit=<number> Limit the size of inlined functions to <number>
1045 finstrument-functions
1046 Common Report Var(flag_instrument_function_entry_exit)
1047 Instrument function entry and exit with profiling calls
1049 finstrument-functions-exclude-function-list=
1050 Common RejectNegative Joined
1051 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1053 finstrument-functions-exclude-file-list=
1054 Common RejectNegative Joined
1055 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1058 Common Report Var(flag_ipa_cp) Optimization
1059 Perform Interprocedural constant propagation
1062 Common Report Var(flag_ipa_cp_clone) Optimization
1063 Perform cloning to make Interprocedural constant propagation stronger
1066 Common Report Var(flag_ipa_profile) Init(0) Optimization
1067 Perform interprocedural profile propagation
1070 Common Report Var(flag_ipa_pta) Init(0) Optimization
1071 Perform interprocedural points-to analysis
1074 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1075 Discover pure and const functions
1078 Common Report Var(flag_ipa_reference) Init(0) Optimization
1079 Discover readonly and non addressable static variables
1082 Common Report Var(flag_ipa_matrix_reorg) Optimization
1083 Perform matrix layout flattening and transposing based
1084 on profiling information.
1087 Common Report Var(flag_ipa_struct_reorg)
1088 Perform structure layout optimizations based
1089 on profiling information.
1092 Common Joined RejectNegative
1093 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1096 Common Joined RejectNegative
1097 -fira-region=[one|all|mixed] Set regions for IRA
1100 Common Report Var(flag_ira_loop_pressure)
1101 Use IRA based register pressure calculation
1102 in RTL loop optimizations.
1104 fira-share-save-slots
1105 Common Report Var(flag_ira_share_save_slots) Init(1)
1106 Share slots for saving different hard registers.
1108 fira-share-spill-slots
1109 Common Report Var(flag_ira_share_spill_slots) Init(1)
1110 Share stack slots for spilled pseudo-registers.
1113 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1114 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1117 Common Report Var(flag_ivopts) Init(1) Optimization
1118 Optimize induction variables on trees
1121 Common Var(flag_jump_tables) Init(1) Optimization
1122 Use jump tables for sufficiently large switch statements
1124 fkeep-inline-functions
1125 Common Report Var(flag_keep_inline_functions)
1126 Generate code for functions even if they are fully inlined
1129 Common Report Var(flag_keep_static_consts) Init(1)
1130 Emit static const variables even if they are not used
1133 Common Report Var(flag_leading_underscore) Init(-1)
1134 Give external symbols a leading underscore
1138 Does nothing. Preserved for backward compatibility.
1142 Enable link-time optimization.
1145 Common RejectNegative Joined Var(flag_lto)
1146 Link-time optimization with number of parallel jobs or jobserver.
1149 Common Var(flag_lto_partition_1to1)
1150 Partition functions and vars at linktime based on object files they originate from
1152 flto-partition=balanced
1153 Common Var(flag_lto_partition_balanced)
1154 Partition functions and vars at linktime into approximately same sized buckets
1157 Common Var(flag_lto_partition_none)
1158 Disable partioning and streaming
1160 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1161 flto-compression-level=
1162 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1163 -flto-compression-level=<number> Use zlib compression level <number> for IL
1166 Common Report Var(flag_lto_report) Init(0) Optimization
1167 Report various link-time optimization statistics
1170 Common Report Var(flag_errno_math) Init(1) Optimization
1171 Set errno after built-in math functions
1174 Common Joined RejectNegative UInteger Var(flag_max_errors)
1175 -fmax-errors=<number> Maximum number of errors to report
1178 Common Report Var(mem_report)
1179 Report on permanent memory allocation
1181 ; This will attempt to merge constant section constants, if 1 only
1182 ; string constants and constants from constant pool, if 2 also constant
1184 fmerge-all-constants
1185 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1186 Attempt to merge identical constants and constant variables
1189 Common Report Var(flag_merge_constants,1) Optimization
1190 Attempt to merge identical constants across compilation units
1192 fmerge-debug-strings
1193 Common Report Var(flag_merge_debug_strings) Init(1)
1194 Attempt to merge identical debug strings across compilation units
1197 Common RejectNegative Joined UInteger
1198 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1201 Common Report Var(flag_modulo_sched) Optimization
1202 Perform SMS based modulo scheduling before the first scheduling pass
1204 fmodulo-sched-allow-regmoves
1205 Common Report Var(flag_modulo_sched_allow_regmoves)
1206 Perform SMS based modulo scheduling with register moves allowed
1208 fmove-loop-invariants
1209 Common Report Var(flag_move_loop_invariants) Init(1) Optimization
1210 Move loop invariant computations out of loops
1213 Common RejectNegative Report Var(flag_mudflap)
1214 Add mudflap bounds-checking instrumentation for single-threaded program
1217 Common RejectNegative Report Var(flag_mudflap,2)
1218 Add mudflap bounds-checking instrumentation for multi-threaded program
1221 Common RejectNegative Report Var(flag_mudflap_ignore_reads)
1222 Ignore read operations when inserting mudflap instrumentation
1225 Common Var(flag_dce) Init(1) Optimization
1226 Use the RTL dead code elimination pass
1229 Common Var(flag_dse) Init(1) Optimization
1230 Use the RTL dead store elimination pass
1232 freschedule-modulo-scheduled-loops
1233 Common Report Var(flag_resched_modulo_sched) Optimization
1234 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1236 fnon-call-exceptions
1237 Common Report Var(flag_non_call_exceptions) Optimization
1238 Support synchronous non-call exceptions
1241 Common Report Var(flag_omit_frame_pointer) Optimization
1242 When possible do not generate stack frames
1244 foptimize-register-move
1245 Common Report Var(flag_regmove) Optimization
1246 Do the full register move optimization pass
1248 foptimize-sibling-calls
1249 Common Report Var(flag_optimize_sibling_calls) Optimization
1250 Optimize sibling and tail recursive calls
1253 Common Report Var(flag_partial_inlining)
1254 Perform partial inlining
1257 Common Report Var(pre_ipa_mem_report)
1258 Report on memory allocation before interprocedural optimization
1260 fpost-ipa-mem-report
1261 Common Report Var(post_ipa_mem_report)
1262 Report on memory allocation before interprocedural optimization
1265 Common Report Var(flag_pack_struct) Optimization
1266 Pack structure members together without holes
1269 Common RejectNegative Joined UInteger Optimization
1270 -fpack-struct=<number> Set initial maximum structure member alignment
1273 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1274 Return small aggregates in memory, not registers
1277 Common Report Var(flag_peel_loops) Optimization
1278 Perform loop peeling
1281 Common Report Var(flag_no_peephole,0) Optimization
1282 Enable machine specific peephole optimizations
1285 Common Report Var(flag_peephole2) Optimization
1286 Enable an RTL peephole pass before sched2
1289 Common Report Var(flag_pic,2)
1290 Generate position-independent code if possible (large mode)
1293 Common Report Var(flag_pie,2)
1294 Generate position-independent code for executables if possible (large mode)
1297 Common Report Var(flag_pic,1)
1298 Generate position-independent code if possible (small mode)
1301 Common Report Var(flag_pie,1)
1302 Generate position-independent code for executables if possible (small mode)
1305 Common Joined RejectNegative
1306 Specify a plugin to load
1309 Common Joined RejectNegative
1310 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1312 fpredictive-commoning
1313 Common Report Var(flag_predictive_commoning) Optimization
1314 Run predictive commoning optimization.
1316 fprefetch-loop-arrays
1317 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1318 Generate prefetch instructions, if available, for arrays in loops
1321 Common Report Var(profile_flag)
1322 Enable basic program profiling code
1325 Common Report Var(profile_arc_flag)
1326 Insert arc-based program profiling code
1329 Common Joined RejectNegative
1330 Set the top-level directory for storing the profile data.
1331 The default is 'pwd'.
1334 Common Report Var(flag_profile_correction)
1335 Enable correction of flow inconsistent profile data input
1339 Enable common options for generating profile info for profile feedback directed optimizations
1342 Common Joined RejectNegative
1343 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1346 Common Var(flag_profile_use)
1347 Enable common options for performing profile feedback directed optimizations
1350 Common Joined RejectNegative
1351 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1354 Common Report Var(flag_profile_values)
1355 Insert code to profile values of expressions
1361 Common Joined RejectNegative
1362 -frandom-seed=<string> Make compile reproducible using <string>
1364 ; This switch causes the command line that was used to create an
1365 ; object file to be recorded into the object file. The exact format
1366 ; of this recording is target and binary file format dependent.
1367 ; It is related to the -fverbose-asm switch, but that switch only
1368 ; records information in the assembler output file as comments, so
1369 ; they never reach the object file.
1370 frecord-gcc-switches
1371 Common Report Var(flag_record_gcc_switches)
1372 Record gcc command line switches in the object file.
1375 Common Report Var(flag_pcc_struct_return,0) Optimization
1376 Return small aggregates in registers
1379 Common Report Var(flag_regmove) Optimization
1380 Enables a register move optimization
1383 Common Report Var(flag_rename_registers) Init(2) Optimization
1384 Perform a register renaming optimization pass
1387 Common Report Var(flag_reorder_blocks) Optimization
1388 Reorder basic blocks to improve code placement
1390 freorder-blocks-and-partition
1391 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1392 Reorder basic blocks and partition into hot and cold sections
1395 Common Report Var(flag_reorder_functions) Optimization
1396 Reorder functions to improve code placement
1398 frerun-cse-after-loop
1399 Common Report Var(flag_rerun_cse_after_loop) Optimization
1400 Add a common subexpression elimination pass after loop optimizations
1404 Does nothing. Preserved for backward compatibility.
1407 Common Report Var(flag_rounding_math) Optimization
1408 Disable optimizations that assume default FP rounding behavior
1411 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1412 Enable scheduling across basic blocks
1415 Common Report Var(flag_sched_pressure) Init(0) Optimization
1416 Enable register pressure sensitive insn scheduling
1419 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1420 Allow speculative motion of non-loads
1423 Common Report Var(flag_schedule_speculative_load) Optimization
1424 Allow speculative motion of some loads
1426 fsched-spec-load-dangerous
1427 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1428 Allow speculative motion of more loads
1431 Common RejectNegative Joined
1432 -fsched-verbose=<number> Set the verbosity level of the scheduler
1434 fsched2-use-superblocks
1435 Common Report Var(flag_sched2_use_superblocks) Optimization
1436 If scheduling post reload, do superblock scheduling
1440 Does nothing. Preserved for backward compatibility.
1443 Common Report Var(flag_schedule_insns) Optimization
1444 Reschedule instructions before register allocation
1447 Common Report Var(flag_schedule_insns_after_reload) Optimization
1448 Reschedule instructions after register allocation
1450 ; This flag should be on when a target implements non-trivial
1451 ; scheduling hooks, maybe saving some information for its own sake.
1452 ; On IA64, for example, this is used for correct bundling.
1453 fselective-scheduling
1454 Common Report Var(flag_selective_scheduling) Optimization
1455 Schedule instructions using selective scheduling algorithm
1457 fselective-scheduling2
1458 Common Report Var(flag_selective_scheduling2) Optimization
1459 Run selective scheduling after reload
1461 fsel-sched-pipelining
1462 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1463 Perform software pipelining of inner loops during selective scheduling
1465 fsel-sched-pipelining-outer-loops
1466 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1467 Perform software pipelining of outer loops during selective scheduling
1469 fsel-sched-reschedule-pipelined
1470 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1471 Reschedule pipelined regions without pipelining
1473 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1474 ; of stalled insns into the ready list.
1475 fsched-stalled-insns
1476 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1477 Allow premature scheduling of queued insns
1479 fsched-stalled-insns=
1480 Common RejectNegative Joined UInteger
1481 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1483 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1484 ; be examined for a dependency on a stalled insn that is candidate for
1485 ; premature removal from the queue of stalled insns into the ready list (has
1486 ; an effect only if the flag 'sched_stalled_insns' is set).
1487 fsched-stalled-insns-dep
1488 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1489 Set dependence distance checking in premature scheduling of queued insns
1491 fsched-stalled-insns-dep=
1492 Common RejectNegative Joined UInteger
1493 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1495 fsched-group-heuristic
1496 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1497 Enable the group heuristic in the scheduler
1499 fsched-critical-path-heuristic
1500 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1501 Enable the critical path heuristic in the scheduler
1503 fsched-spec-insn-heuristic
1504 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1505 Enable the speculative instruction heuristic in the scheduler
1507 fsched-rank-heuristic
1508 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1509 Enable the rank heuristic in the scheduler
1511 fsched-last-insn-heuristic
1512 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1513 Enable the last instruction heuristic in the scheduler
1515 fsched-dep-count-heuristic
1516 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1517 Enable the dependent count heuristic in the scheduler
1520 Common Report Var(flag_section_anchors) Optimization
1521 Access data in the same section from shared anchor points
1525 Does nothing. Preserved for backward compatibility.
1528 Common Report Var(flag_zee) Init(0)
1529 Eliminate redundant zero extensions on targets that support implicit extensions.
1532 Common Report Var(flag_show_column) Init(1)
1533 Show column numbers in diagnostics, when available. Default on
1536 Common Report Var(flag_signaling_nans) Optimization
1537 Disable optimizations observable by IEEE signaling NaNs
1540 Common Report Var(flag_signed_zeros) Init(1) Optimization
1541 Disable floating point optimizations that ignore the IEEE signedness of zero
1543 fsingle-precision-constant
1544 Common Report Var(flag_single_precision_constant) Optimization
1545 Convert floating point constants to single precision constants
1547 fsplit-ivs-in-unroller
1548 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1549 Split lifetimes of induction variables when loops are unrolled
1552 Common Report Var(flag_split_stack) Init(-1)
1553 Generate discontiguous stack frames
1556 Common Report Var(flag_split_wide_types) Optimization
1557 Split wide types into independent registers
1559 fvariable-expansion-in-unroller
1560 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1561 Apply variable expansion when loops are unrolled
1564 Common Report RejectNegative Joined
1565 -fstack-check=[no|generic|specific] Insert stack checking code into the program
1568 Common Alias(fstack-check=, specific, no)
1569 Insert stack checking code into the program. Same as -fstack-check=specific
1574 fstack-limit-register=
1575 Common RejectNegative Joined
1576 -fstack-limit-register=<register> Trap if the stack goes past <register>
1578 fstack-limit-symbol=
1579 Common RejectNegative Joined
1580 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
1583 Common Report Var(flag_stack_protect, 1)
1584 Use propolice as a stack protection method
1586 fstack-protector-all
1587 Common Report RejectNegative Var(flag_stack_protect, 2)
1588 Use a stack protection method for every function
1591 Common RejectNegative Var(flag_stack_usage)
1592 Output stack usage information on a per-function basis
1596 Does nothing. Preserved for backward compatibility.
1598 ; Nonzero if we should do (language-dependent) alias analysis.
1599 ; Typically, this analysis will assume that expressions of certain
1600 ; types do not alias expressions of certain other types. Only used
1601 ; if alias analysis (in general) is enabled.
1603 Common Report Var(flag_strict_aliasing) Optimization
1604 Assume strict aliasing rules apply
1607 Common Report Var(flag_strict_overflow)
1608 Treat signed overflow as undefined
1611 Common Report Var(flag_syntax_only)
1612 Check for syntax errors, then stop
1615 Common Report Var(flag_test_coverage)
1616 Create data files needed by \"gcov\"
1619 Common Report Var(flag_thread_jumps) Optimization
1620 Perform jump threading optimizations
1623 Common Report Var(time_report)
1624 Report the time taken by each compiler pass
1627 Common Joined RejectNegative
1628 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
1631 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
1632 Reorder top level functions, variables, and asms
1635 Common Report Var(flag_tracer)
1636 Perform superblock formation via tail duplication
1638 ; Zero means that floating-point math operations cannot generate a
1639 ; (user-visible) trap. This is the case, for example, in nonstop
1640 ; IEEE 754 arithmetic.
1642 Common Report Var(flag_trapping_math) Init(1) Optimization
1643 Assume floating-point operations can trap
1646 Common Report Var(flag_trapv) Optimization
1647 Trap for signed overflow in addition, subtraction and multiplication
1650 Common Report Var(flag_tree_ccp) Optimization
1651 Enable SSA-CCP optimization on trees
1654 Common Report Var(flag_tree_bit_ccp) Optimization
1655 Enable SSA-BIT-CCP optimization on trees
1659 Does nothing. Preserved for backward compatibility.
1662 Common Report Var(flag_tree_ch) Optimization
1663 Enable loop header copying on trees
1666 Common Report Var(flag_tree_copyrename) Optimization
1667 Replace SSA temporaries with better names in copies
1670 Common Report Var(flag_tree_copy_prop) Optimization
1671 Enable copy propagation on trees
1673 ftree-store-copy-prop
1675 Does nothing. Preserved for backward compatibility.
1678 Common Report Var(flag_tree_cselim) Init(2) Optimization
1679 Transform condition stores into unconditional ones
1681 ftree-switch-conversion
1682 Common Report Var(flag_tree_switch_conversion) Optimization
1683 Perform conversions of switch initializations.
1686 Common Report Var(flag_tree_dce) Optimization
1687 Enable SSA dead code elimination optimization on trees
1689 ftree-dominator-opts
1690 Common Report Var(flag_tree_dom) Optimization
1691 Enable dominator optimizations
1694 Common Report Var(flag_tree_dse) Optimization
1695 Enable dead store elimination
1698 Common Report Var(flag_tree_forwprop) Init(1) Optimization
1699 Enable forward propagation on trees
1702 Common Report Var(flag_tree_fre) Optimization
1703 Enable Full Redundancy Elimination (FRE) on trees
1705 ftree-loop-distribution
1706 Common Report Var(flag_tree_loop_distribution) Optimization
1707 Enable loop distribution on trees
1709 ftree-loop-distribute-patterns
1710 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
1711 Enable loop distribution for patterns transformed into a library call
1714 Common Report Var(flag_tree_loop_im) Init(1) Optimization
1715 Enable loop invariant motion on trees
1718 Common Report Var(flag_tree_loop_linear) Optimization
1719 Enable linear loop transforms on trees
1722 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
1723 Create canonical induction variables in loops
1726 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
1727 Enable loop optimizations on tree level
1729 ftree-parallelize-loops=
1730 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
1731 Enable automatic parallelization of loops
1734 Common Report Var(flag_tree_phiprop) Init(1) Optimization
1735 Enable hoisting loads from conditional pointers.
1738 Common Report Var(flag_tree_pre) Optimization
1739 Enable SSA-PRE optimization on trees
1742 Common Report Var(flag_tree_pta) Init(1) Optimization
1743 Perform function-local points-to analysis on trees.
1746 Common Report Var(flag_tree_reassoc) Init(1) Optimization
1747 Enable reassociation on tree level
1751 Does nothing. Preserved for backward compatibility.
1754 Common Report Var(flag_tree_sink) Optimization
1755 Enable SSA code sinking on trees
1758 Common Report Var(flag_tree_sra) Optimization
1759 Perform scalar replacement of aggregates
1762 Common Report Var(flag_tree_ter) Optimization
1763 Replace temporary expressions in the SSA->normal pass
1766 Common Report Var(flag_tree_live_range_split) Optimization
1767 Perform live range splitting during the SSA->normal pass
1770 Common Report Var(flag_tree_vrp) Init(0) Optimization
1771 Perform Value Range Propagation on trees
1774 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
1775 Compile whole compilation unit at a time
1778 Common Report Var(flag_unroll_loops) Optimization
1779 Perform loop unrolling when iteration count is known
1782 Common Report Var(flag_unroll_all_loops) Optimization
1783 Perform loop unrolling for all loops
1785 ; Nonzero means that loop optimizer may assume that the induction variables
1786 ; that control loops do not overflow and that the loops with nontrivial
1787 ; exit condition are not infinite
1788 funsafe-loop-optimizations
1789 Common Report Var(flag_unsafe_loop_optimizations) Optimization
1790 Allow loop optimizations to assume that the loops behave in normal way
1793 Common Report Var(flag_associative_math)
1794 Allow optimization for floating-point arithmetic which may change the
1795 result of the operation due to rounding.
1798 Common Report Var(flag_reciprocal_math)
1799 Same as -fassociative-math for expressions which include division.
1801 ; Nonzero means that unsafe floating-point math optimizations are allowed
1802 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
1803 ; are allowed to assume that their arguments and results are "normal"
1804 ; (e.g., nonnegative for SQRT).
1805 funsafe-math-optimizations
1806 Common Report Var(flag_unsafe_math_optimizations) Optimization
1807 Allow math optimizations that may violate IEEE or ISO standards
1810 Common Report Var(flag_unswitch_loops) Optimization
1811 Perform loop unswitching
1814 Common Report Var(flag_unwind_tables) Optimization
1815 Just generate unwind tables for exception handling
1820 ; Positive if we should track variables, negative if we should run
1821 ; the var-tracking pass only to discard debug annotations, zero if
1822 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
1823 ; will be set according to optimize, debug_info_level and debug_hooks
1824 ; in process_options ().
1826 Common Report Var(flag_var_tracking) Init(2) Optimization
1827 Perform variable tracking
1829 ; Positive if we should track variables at assignments, negative if
1830 ; we should run the var-tracking pass only to discard debug
1831 ; annotations. When flag_var_tracking_assignments ==
1832 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
1833 fvar-tracking-assignments
1834 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
1835 Perform variable tracking by annotating assignments
1837 ; Nonzero if we should toggle flag_var_tracking_assignments after
1838 ; processing options and computing its default. */
1839 fvar-tracking-assignments-toggle
1840 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
1841 Toggle -fvar-tracking-assignments
1843 fvar-tracking-uninit
1844 Common Report Var(flag_var_tracking_uninit) Optimization
1845 Perform variable tracking and also tag variables that are uninitialized
1848 Common Report Var(flag_tree_vectorize) Optimization
1849 Enable loop vectorization on trees
1852 Common Report Var(flag_tree_slp_vectorize) Init(2) Optimization
1853 Enable basic block vectorization (SLP) on trees
1856 Common Report Var(flag_vect_cost_model) Optimization
1857 Enable use of cost model in vectorization
1859 ftree-vect-loop-version
1860 Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization
1861 Enable loop versioning when doing loop vectorization on trees
1863 ftree-vectorizer-verbose=
1864 Common RejectNegative Joined
1865 -ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
1868 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
1869 Enable copy propagation of scalar-evolution information.
1871 ; -fverbose-asm causes extra commentary information to be produced in
1872 ; the generated assembly code (to make it more readable). This option
1873 ; is generally only of use to those who actually need to read the
1874 ; generated assembly code (perhaps while debugging the compiler itself).
1875 ; -fno-verbose-asm, the default, causes the extra information
1876 ; to not be added and is useful when comparing two assembler files.
1878 Common Report Var(flag_verbose_asm)
1879 Add extra commentary to assembler output
1882 Common Joined RejectNegative
1883 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
1887 Common Report Var(flag_value_profile_transformations) Optimization
1888 Use expression value profiles in optimizations
1891 Common Report Var(flag_web) Init(2) Optimization
1892 Construct webs and split unrelated uses of single variable
1894 ftree-builtin-call-dce
1895 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
1896 Enable conditional dead code elimination for builtin calls
1899 Common Report Var(flag_whole_program) Init(0) Optimization
1900 Perform whole program optimizations
1903 Common Report Var(flag_wrapv) Optimization
1904 Assume signed arithmetic overflow wraps around
1906 fzero-initialized-in-bss
1907 Common Report Var(flag_zero_initialized_in_bss) Init(1)
1908 Put zero initialized data in the bss section
1911 Common JoinedOrMissing
1912 Generate debug information in default format
1915 Common JoinedOrMissing Negative(gdwarf-)
1916 Generate debug information in COFF format
1919 Common Joined UInteger Var(dwarf_version) Init(2) Negative(gstabs)
1920 Generate debug information in DWARF v2 (or later) format
1923 Common JoinedOrMissing
1924 Generate debug information in default extended format
1927 Common JoinedOrMissing Negative(gstabs+)
1928 Generate debug information in STABS format
1931 Common JoinedOrMissing Negative(gvms)
1932 Generate debug information in extended STABS format
1935 Common RejectNegative Var(dwarf_strict,0) Init(-1)
1936 Emit DWARF additions beyond selected version
1939 Common Report RejectNegative Var(dwarf_strict,1)
1940 Don't emit DWARF additions beyond selected version
1943 Common Report Var(flag_gtoggle)
1944 Toggle debug information generation
1947 Common JoinedOrMissing Negative(gxcoff)
1948 Generate debug information in VMS format
1951 Common JoinedOrMissing Negative(gxcoff+)
1952 Generate debug information in XCOFF format
1955 Common JoinedOrMissing Negative(gcoff)
1956 Generate debug information in extended XCOFF format
1959 Driver Joined Separate
1962 Common Joined Var(plugindir_string) Init(0)
1963 -iplugindir=<dir> Set <dir> to be the default plugin directory
1966 Driver Joined Separate
1968 no-canonical-prefixes
1978 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
1979 -o <file> Place output into <file>
1982 Common Var(profile_flag)
1983 Enable function profiling
1986 Driver Var(pass_exit_codes)
1989 Common Var(pedantic)
1990 Issue warnings needed for strict compliance to the standard
1993 Common Var(flag_pedantic_errors)
1994 Like -pedantic but issue them as errors
2000 Driver Var(use_pipes)
2003 Driver JoinedOrMissing Var(print_file_name)
2005 print-libgcc-file-name
2008 print-multi-directory
2009 Driver Var(print_multi_directory)
2012 Driver Var(print_multi_lib)
2014 print-multi-os-directory
2015 Driver Var(print_multi_os_directory)
2018 Driver JoinedOrMissing Var(print_prog_name)
2021 Driver Var(print_search_dirs)
2024 Driver Var(print_sysroot)
2026 print-sysroot-headers-suffix
2027 Driver Var(print_sysroot_headers_suffix)
2030 Common Var(quiet_flag) RejectDriver
2031 Do not display functions compiled or elapsed time
2040 Driver Var(report_times)
2043 Driver JoinedOrMissing
2046 Driver Joined Separate
2050 ; C option, but driver must not handle as "-u ndef".
2053 Common Driver Var(verbose_flag)
2054 Enable verbose output
2057 Common Var(version_flag) RejectDriver
2058 Display the compiler's version
2061 Common Var(inhibit_warnings)
2065 Driver Separate Var(wrapper_string)
2068 Driver Joined Separate
2071 Common RejectNegative Negative(pie)
2072 Create a shared library
2078 Driver Separate Alias(specs=)
2091 ; Documented for Fortran, but always accepted by driver.
2100 Common RejectNegative Negative(shared)
2101 Create a position independent executable
2104 Driver Joined Separate
2106 ; This comment is to ensure we retain the blank line above.