1 ; Options for the language- and target-independent parts of the compiler.
3 ; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
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 ; Not used directly to control optimizations, only to save -Ofast
36 ; setting for "optimize" attributes.
40 ; 0 means straightforward implementation of complex divide acceptable.
41 ; 1 means wide ranges of inputs must work for complex divide.
42 ; 2 means C99-like requirements for complex multiply and divide.
44 int flag_complex_method = 1
46 ; Nonzero if subexpressions must be evaluated from left-to-right.
48 int flag_evaluation_order = 0
50 ; Language specific warning pass for unused results.
52 bool flag_warn_unused_result = false
57 ; Nonzero if we should write GIMPLE bytecode for link-time optimization.
61 ; True to warn about any objects definitions whose size is larger
62 ; than N bytes. Also want about function definitions whose returned
63 ; values are larger than N bytes, where N is 'larger_than_size'.
68 HOST_WIDE_INT larger_than_size
70 ; True to warn about any function whose frame size is larger
73 bool warn_frame_larger_than
76 HOST_WIDE_INT frame_larger_than_size
78 ; Nonzero means we should be saving declaration info into a .X file.
80 int flag_gen_aux_info = 0
82 ; Nonzero if we are compiling code for a shared library, zero for
87 ; These two are really VEC(char_p,heap) *.
90 void *flag_instrument_functions_exclude_functions
93 void *flag_instrument_functions_exclude_files
95 ; Generic structs (e.g. templates not explicitly specialized)
96 ; may not have a compilation unit associated with them, and so
97 ; may need to be treated differently from ordinary structs.
99 ; Structs only handled by reference (indirectly), will also usually
100 ; not need as much debugging information.
103 enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
106 enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
108 ; True if we should exit after parsing options.
110 bool exit_after_options
112 ; Type(s) of debugging information we are producing (if any). See
113 ; flag-types.h for the definitions of the different possible types of
114 ; debugging information.
116 enum debug_info_type write_symbols = NO_DEBUG
118 ; Level of debugging information we are producing. See flag-types.h
119 ; for the definitions of the different possible levels.
121 enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
123 ; Nonzero means use GNU-only extensions in the generated symbolic
124 ; debugging information. Currently, this only has an effect when
125 ; write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG.
127 bool use_gnu_debug_info_extensions
129 ; Original value of maximum field alignment in bytes, specified via
130 ; -fpack-struct=<value>.
132 unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
135 enum vect_verbosity_levels user_vect_verbosity_level = MAX_VERBOSITY_LEVEL
137 ; Type of stack check.
139 enum stack_check_type flag_stack_check = NO_STACK_CHECK
141 ; -dA causes debug commentary information to be produced in
142 ; the generated assembly code (to make it more readable). This option
143 ; is generally only of use to those who actually need to read the
144 ; generated assembly code (perhaps while debugging the compiler itself).
145 ; Currently, this switch is only used by dwarf2out.c; however, it is intended
146 ; to be a catchall for printing debug information in the assembler file.
150 ; -dP causes the rtl to be emitted as a comment in assembly.
152 int flag_dump_rtl_in_asm
154 ; Whether -da was passed (used only in handle_common_deferred_options).
156 bool flag_dump_all_passed
158 ; Other flags saying which kinds of debugging dump have been requested.
161 int rtl_dump_and_exit
164 int flag_print_asm_name
167 enum graph_dump_types graph_dump_format = no_graph
169 ; Name of top-level original source file (what was input to cpp).
170 ; This comes from the #-command at the beginning of the actual input.
171 ; If there isn't any there, then this is the cc1 input file name.
173 const char *main_input_filename
175 ; Pointer to base name in main_input_filename, with directories and a
176 ; single final extension removed, and the length of this base
180 const char *main_input_basename
183 int main_input_baselength
185 ; Which options have been printed by --help.
189 ; Which enums have been printed by --help. 0 = not printed, no
190 ; relevant options seen, 1 = relevant option seen, not yet printed, 2
193 char *help_enum_printed
195 ; The number of columns for --help output.
197 unsigned int help_columns
199 ; Whether this options structure has been through finish_options
201 bool flag_opts_finished
213 Driver Alias(coverage)
219 Common Separate Alias(d)
222 Common Joined Alias(d)
225 Common Separate Alias(dumpbase)
228 Common Separate Alias(dumpdir)
231 Driver Separate Alias(e)
234 Driver Joined Alias(e)
237 Common Warning Alias(Wextra)
240 Driver Separate Alias(Xassembler)
243 Driver JoinedOrMissing Alias(Xassembler)
246 Driver Separate Alias(Xlinker)
249 Driver JoinedOrMissing Alias(Xlinker)
252 Driver Separate Alias(u)
255 Driver Joined Alias(u)
258 Common Driver Var(help_flag)
259 Display this information
262 Common Driver Report Joined
263 --help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params
266 Driver Separate Alias(x)
269 Driver Joined Alias(x)
272 Driver Separate Alias(L)
275 Driver Joined Alias(L)
277 -no-canonical-prefixes
278 Driver Alias(no-canonical-prefixes)
280 -no-standard-libraries
281 Driver Alias(nostdlib)
290 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
293 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
296 Driver Alias(pass-exit-codes)
299 Common Alias(pedantic)
302 Common Alias(pedantic-errors)
311 Driver Separate Alias(B)
314 Driver JoinedOrMissing Alias(B)
320 Driver Separate Alias(print-file-name=)
323 Driver JoinedOrMissing Alias(print-file-name=)
325 -print-libgcc-file-name
326 Driver Alias(print-libgcc-file-name)
328 -print-multi-directory
329 Driver Alias(print-multi-directory)
332 Driver Alias(print-multi-lib)
334 -print-multi-os-directory
335 Driver Alias(print-multi-os-directory)
338 Driver Separate Alias(print-prog-name=)
341 Driver JoinedOrMissing Alias(print-prog-name=)
344 Driver Alias(print-search-dirs)
347 Driver Alias(print-sysroot)
349 -print-sysroot-headers-suffix
350 Driver Alias(print-sysroot-headers-suffix)
356 Driver Alias(save-temps)
362 Driver Separate Alias(specs=)
365 Driver Joined Alias(specs=)
371 Driver Alias(symbolic)
375 Alias for --help=target
383 ;; The driver used to convert options such as --help into forms such
384 ;; as -fhelp; the following four entries are for compatibility with
385 ;; any direct uses of those (undocumented) -f forms
387 Common Driver Alias(-help)
390 Common Driver Joined Alias(-help=)
393 Common Driver Alias(-target-help)
396 Common Driver Alias(-version)
400 --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
403 Common Joined Alias(-param)
406 Driver Separate Alias(-sysroot=)
409 Driver JoinedOrMissing
415 Driver Joined Separate
421 Driver Joined Separate
427 Common JoinedOrMissing Optimization
428 -O<number> Set optimization level to <number>
432 Optimize for space rather than speed
436 Optimize for speed disregarding exact standards compliance
448 Driver Joined Separate
454 Driver Joined Separate
466 Common RejectNegative Warning Alias(Wextra)
467 This switch is deprecated; use -Wextra instead
470 Driver JoinedOrMissing
473 Driver JoinedOrMissing
476 Driver JoinedOrMissing
479 Common Var(warn_aggregate_return) Warning
480 Warn about returning structures, unions or arrays
483 Common Var(warn_array_bounds) Warning
484 Warn if an array is accessed out of bounds
487 Common Var(warn_attributes) Init(1) Warning
488 Warn about inappropriate attribute usage
491 Common Var(warn_cast_align) Warning
492 Warn about pointer casts which increase alignment
495 Common Var(warn_cpp) Init(1) Warning
496 Warn when a #warning directive is encountered
498 Wdeprecated-declarations
499 Common Var(warn_deprecated_decl) Init(1) Warning
500 Warn about uses of __attribute__((deprecated)) declarations
502 Wdisabled-optimization
503 Common Var(warn_disabled_optimization) Warning
504 Warn when an optimization pass is disabled
507 Common Var(warnings_are_errors)
508 Treat all warnings as errors
512 Treat specified warning as error
515 Common Var(extra_warnings) Warning
516 Print extra (possibly unwanted) warnings
519 Common Var(flag_fatal_errors)
520 Exit on the first error occurred
523 Common RejectNegative Joined UInteger
524 -Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
527 Common Var(warn_inline) Warning
528 Warn when an inlined function cannot be inlined
531 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
534 Common RejectNegative Joined UInteger Warning
535 -Wlarger-than=<number> Warn if an object is larger than <number> bytes
537 Wunsafe-loop-optimizations
538 Common Var(warn_unsafe_loop_optimizations) Warning
539 Warn if the loop cannot be optimized due to nontrivial assumptions.
542 Common Var(warn_missing_noreturn) Warning
543 Warn about functions which might be candidates for __attribute__((noreturn))
546 Common Var(warn_mudflap) Init(1) Warning
547 Warn about constructs not instrumented by -fmudflap
550 Common Var(warn_overflow) Init(1) Warning
551 Warn about overflow in arithmetic expressions
554 Common Var(warn_packed) Warning
555 Warn when the packed attribute has no effect on struct layout
558 Common Var(warn_padded) Warning
559 Warn when padding is required to align structure members
562 Common Var(warn_shadow) Warning
563 Warn when one local variable shadows another
566 Common Var(warn_stack_protect) Warning
567 Warn when not issuing stack smashing protection for some reason
571 Warn about code which might break strict aliasing rules
574 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Init(-1) Warning
575 Warn about code which might break strict aliasing rules
579 Warn about optimizations that assume that signed overflow is undefined
582 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Init(-1) Warning
583 Warn about optimizations that assume that signed overflow is undefined
585 Wsuggest-attribute=const
586 Common Var(warn_suggest_attribute_const) Warning
587 Warn about functions which might be candidates for __attribute__((const))
589 Wsuggest-attribute=pure
590 Common Var(warn_suggest_attribute_pure) Warning
591 Warn about functions which might be candidates for __attribute__((pure))
593 Wsuggest-attribute=noreturn
594 Common Var(warn_suggest_attribute_noreturn) Warning
595 Warn about functions which might be candidates for __attribute__((noreturn))
598 Common Var(warn_switch) Warning
599 Warn about enumerated switches, with no default, missing a case
602 Common Var(warn_switch_default) Warning
603 Warn about enumerated switches missing a \"default:\" statement
606 Common Var(warn_switch_enum) Warning
607 Warn about all enumerated switches missing a specific case
610 Common Var(warn_system_headers) Warning
611 Do not suppress warnings from system headers
614 Common Var(warn_trampolines) Warning
615 Warn whenever a trampoline is generated
618 Common Var(warn_type_limits) Init(-1) Warning
619 Warn if a comparison is always true or always false due to the limited range of the data type
622 Common Var(warn_uninitialized) Init(-1) Warning
623 Warn about uninitialized automatic variables
627 Does nothing. Preserved for backward compatibility.
630 Common Var(warn_unused) Init(0) Warning
631 Enable all -Wunused- warnings
633 Wunused-but-set-parameter
634 Common Var(warn_unused_but_set_parameter) Init(-1) Warning
635 Warn when a function parameter is only set, otherwise unused
637 Wunused-but-set-variable
638 Common Var(warn_unused_but_set_variable) Init(-1) Warning
639 Warn when a variable is only set, otherwise unused
642 Common Var(warn_unused_function) Init(-1) Warning
643 Warn when a function is unused
646 Common Var(warn_unused_label) Init(-1) Warning
647 Warn when a label is unused
650 Common Var(warn_unused_parameter) Init(-1) Warning
651 Warn when a function parameter is unused
654 Common Var(warn_unused_value) Init(-1) Warning
655 Warn when an expression value is unused
658 Common Var(warn_unused_variable) Init(-1) Warning
659 Warn when a variable is unused
662 Common Var(warn_coverage_mismatch) Init(1) Warning
663 Warn in case profiles in -fprofile-use do not match
678 Common Separate Var(aux_info_file_name)
679 -aux-info <file> Emit declaration information into <file>
682 Common Joined Alias(aux-info)
685 Common Separate RejectDriver Var(aux_base_name)
688 Common Separate RejectDriver
698 -d<letters> Enable dumps from specific passes of the compiler
701 Common Separate Var(dump_base_name)
702 -dumpbase <file> Set the file basename to be used for dumps
705 Common Separate Var(dump_dir_name)
706 -dumpdir <dir> Set the directory name to be used for dumps
718 Driver Joined Separate
720 ; This option has historically been passed down to the linker by an
721 ; accident of a %{e*} spec, so ensure it continues to be passed down
722 ; as a single option. The supported option for this purpose is
723 ; -rdynamic. See PR 47390.
727 ; The version of the C++ ABI in use. The following values are allowed:
729 ; 0: The version of the ABI believed most conformant with the C++ ABI
730 ; specification. This ABI may change as bugs are discovered and fixed.
731 ; Therefore, 0 will not necessarily indicate the same ABI in different
734 ; 1: The version of the ABI first used in G++ 3.2.
736 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
738 ; 3: The version of the ABI that fixes the missing underscore
739 ; in template non-type arguments of pointer type.
741 ; 4: The version of the ABI that introduces unambiguous mangling of
742 ; vector types. First selectable in G++ 4.5.
744 ; 5: The version of the ABI that ignores attribute const/noreturn
745 ; in function pointer mangling, and corrects mangling of decltype and
746 ; function parameters used in other parameters and the return type.
747 ; First selectable in G++ 4.6.
749 ; Additional positive integers will be assigned as new versions of
750 ; the ABI become the default version of the ABI.
752 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(2)
755 Common Report Var(align_functions,0) Optimization UInteger
756 Align the start of functions
759 Common RejectNegative Joined UInteger Var(align_functions)
762 Common Report Var(align_jumps,0) Optimization UInteger
763 Align labels which are only reached by jumping
766 Common RejectNegative Joined UInteger Var(align_jumps)
769 Common Report Var(align_labels,0) Optimization UInteger
773 Common RejectNegative Joined UInteger Var(align_labels)
776 Common Report Var(align_loops,0) Optimization UInteger
777 Align the start of loops
780 Common RejectNegative Joined UInteger Var(align_loops)
784 Does nothing. Preserved for backward compatibility.
788 Does nothing. Preserved for backward compatibility.
790 fargument-noalias-global
792 Does nothing. Preserved for backward compatibility.
794 fargument-noalias-anything
796 Does nothing. Preserved for backward compatibility.
798 fasynchronous-unwind-tables
799 Common Report Var(flag_asynchronous_unwind_tables) Optimization
800 Generate unwind tables that are exact at each instruction boundary
803 Common Report Var(flag_auto_inc_dec) Init(1)
804 Generate auto-inc/dec instructions
806 ; -fcheck-bounds causes gcc to generate array bounds checks.
807 ; For C, C++ and ObjC: defaults off.
808 ; For Java: defaults to on.
809 ; For Fortran: defaults to off.
811 Common Report Var(flag_bounds_check)
812 Generate code to check bounds before indexing arrays
815 Common Report Var(flag_branch_on_count_reg) Init(1) Optimization
816 Replace add, compare, branch with branch on count register
818 fbranch-probabilities
819 Common Report Var(flag_branch_probabilities) Optimization
820 Use profiling information for branch probabilities
822 fbranch-target-load-optimize
823 Common Report Var(flag_branch_target_load_optimize) Optimization
824 Perform branch target load optimization before prologue / epilogue threading
826 fbranch-target-load-optimize2
827 Common Report Var(flag_branch_target_load_optimize2) Optimization
828 Perform branch target load optimization after prologue / epilogue threading
831 Common Report Var(flag_btr_bb_exclusive) Optimization
832 Restrict target load migration not to re-use registers in any basic block
835 Common Joined RejectNegative Var(common_deferred_options) Defer
836 -fcall-saved-<register> Mark <register> as being preserved across functions
839 Common Joined RejectNegative Var(common_deferred_options) Defer
840 -fcall-used-<register> Mark <register> as being corrupted by function calls
842 ; Nonzero for -fcaller-saves: allocate values in regs that need to
843 ; be saved across function calls, if that produces overall better code.
844 ; Optional now, so people can test it.
846 Common Report Var(flag_caller_saves) Optimization
847 Save registers around function calls
850 Common Report Var(flag_check_data_deps)
851 Compare the results of several data dependence analyzers.
853 fcombine-stack-adjustments
854 Common Report Var(flag_combine_stack_adjustments) Optimization
855 Looks for opportunities to reduce stack adjustments and stack references.
858 Common Report Var(flag_no_common,0) Optimization
859 Do not put uninitialized globals in the common section
863 ; Converted by the driver to -fcompare-debug= options.
866 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
867 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
869 fcompare-debug-second
870 Common Driver RejectNegative Var(flag_compare_debug)
871 Run only the second compilation of -fcompare-debug
874 Common Report Var(flag_compare_elim_after_reload) Optimization
875 Perform comparison elimination after register allocation has finished
878 Common Var(flag_conserve_stack) Optimization
879 Do not perform optimizations increasing noticeably stack usage
882 Common Report Var(flag_cprop_registers) Optimization
883 Perform a register copy-propagation optimization pass
886 Common Report Var(flag_crossjumping) Optimization
887 Perform cross-jumping optimization
890 Common Report Var(flag_cse_follow_jumps) Optimization
891 When running CSE, follow jumps to their targets
895 Does nothing. Preserved for backward compatibility.
898 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
899 Omit range reduction step when performing complex division
902 Common Report Var(flag_cx_fortran_rules) Optimization
903 Complex multiplication and division follow Fortran rules
906 Common Report Var(flag_data_sections) Optimization
907 Place data items into their own section
910 Common Report Var(common_deferred_options) Defer
911 List all available debugging counters with their limits and counts.
914 Common RejectNegative Joined Var(common_deferred_options) Defer
915 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
918 Common Joined RejectNegative Var(common_deferred_options) Defer
919 Map one directory name to another in debug information
922 Common Report Var(flag_debug_types_section) Init(1)
923 Output .debug_types section when using DWARF v4 debuginfo.
925 ; Nonzero for -fdefer-pop: don't pop args after each function call
926 ; instead save them up to pop many calls' args with one insns.
928 Common Report Var(flag_defer_pop) Optimization
929 Defer popping functions args from stack until later
932 Common Report Var(flag_delayed_branch) Optimization
933 Attempt to fill delay slots of branch instructions
935 fdelete-null-pointer-checks
936 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
937 Delete useless null pointer checks
940 Common Report Var(flag_devirtualize) Optimization
941 Try to convert virtual calls to direct ones.
943 fdiagnostics-show-location=
944 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
945 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
947 ; Required for these enum values.
952 Name(diagnostic_prefixing_rule) Type(int)
955 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
958 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
960 fdiagnostics-show-option
961 Common Var(flag_diagnostics_show_option) Init(1)
962 Amend appropriate diagnostic messages with the command line option that controls them
965 Common Joined RejectNegative Var(common_deferred_options) Defer
966 -fdump-<type> Dump various compiler internals to a file
969 Driver RejectNegative
972 Common RejectNegative Joined Var(flag_dump_final_insns)
973 -fdump-final-insns=filename Dump to filename the insns at the end of translation
976 Common RejectNegative Joined Var(flag_dump_go_spec)
977 -fdump-go-spec=filename Write all declarations to file as Go code
980 Common Report Var(flag_dump_noaddr)
981 Suppress output of addresses in debugging dumps
984 Common Report Var(flag_dump_unnumbered)
985 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
987 fdump-unnumbered-links
988 Common Report Var(flag_dump_unnumbered_links)
989 Suppress output of previous and next insn numbers in debugging dumps
992 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
993 Enable CFI tables via GAS assembler directives.
996 Common Report Var(flag_early_inlining) Init(1) Optimization
997 Perform early inlining
999 feliminate-dwarf2-dups
1000 Common Report Var(flag_eliminate_dwarf2_dups)
1001 Perform DWARF2 duplicate elimination
1004 Common Report Var(flag_ipa_sra) Init(0) Optimization
1005 Perform interprocedural reduction of aggregates
1007 feliminate-unused-debug-symbols
1008 Common Report Var(flag_debug_only_used_symbols)
1009 Perform unused type elimination in debug info
1011 feliminate-unused-debug-types
1012 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1013 Perform unused type elimination in debug info
1015 femit-class-debug-always
1016 Common Report Var(flag_emit_class_debug_always) Init(0)
1017 Do not suppress C++ class debug information.
1020 Common Report Var(flag_exceptions) Optimization
1021 Enable exception handling
1023 fexpensive-optimizations
1024 Common Report Var(flag_expensive_optimizations) Optimization
1025 Perform a number of minor, expensive optimizations
1028 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1029 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1032 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1035 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1038 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1044 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1045 Assume no NaNs or infinities are generated
1048 Common Joined RejectNegative Var(common_deferred_options) Defer
1049 -ffixed-<register> Mark <register> as being unavailable to the compiler
1052 Common Report Var(flag_float_store) Optimization
1053 Don't allocate floats and doubles in extended-precision registers
1057 Does nothing. Preserved for backward compatibility.
1060 Common Report Var(flag_forward_propagate) Optimization
1061 Perform a forward propagation pass on RTL
1064 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1065 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1068 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1071 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1073 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1075 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1078 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1080 ; Nonzero means don't put addresses of constant functions in registers.
1081 ; Used for compiling the Unix kernel, where strange substitutions are
1082 ; done on the assembly output.
1084 Common Report Var(flag_no_function_cse,0)
1085 Allow function addresses to be held in registers
1088 Common Report Var(flag_function_sections)
1089 Place each function into its own section
1092 Common Report Var(flag_gcse) Optimization
1093 Perform global common subexpression elimination
1096 Common Report Var(flag_gcse_lm) Init(1) Optimization
1097 Perform enhanced load motion during global common subexpression elimination
1100 Common Report Var(flag_gcse_sm) Init(0) Optimization
1101 Perform store motion after global common subexpression elimination
1104 Common Report Var(flag_gcse_las) Init(0) Optimization
1105 Perform redundant load after store elimination in global common subexpression
1109 Common Report Var(flag_gcse_after_reload) Optimization
1110 Perform global common subexpression elimination after register allocation
1113 ; This option is not documented yet as its semantics will change.
1115 Common Report Var(flag_graphite)
1116 Enable in and out of Graphite representation
1119 Common Report Var(flag_graphite_identity) Optimization
1120 Enable Graphite Identity transformation
1122 floop-parallelize-all
1123 Common Report Var(flag_loop_parallelize_all) Optimization
1124 Mark all loops as parallel
1127 Common Report Var(flag_loop_strip_mine) Optimization
1128 Enable Loop Strip Mining transformation
1131 Common Report Var(flag_loop_interchange) Optimization
1132 Enable Loop Interchange transformation
1135 Common Report Var(flag_loop_block) Optimization
1136 Enable Loop Blocking transformation
1139 Common Report Var(flag_loop_flatten) Optimization
1140 Enable Loop Flattening transformation
1142 fstrict-volatile-bitfields
1143 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1144 Force bitfield accesses to match their type width
1146 fguess-branch-probability
1147 Common Report Var(flag_guess_branch_prob) Optimization
1148 Enable guessing of branch probabilities
1150 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1151 ; Generate position-independent code for executables if possible
1152 ; On SVR4 targets, it also controls whether or not to emit a
1153 ; string identifying the compiler.
1155 Common Report Var(flag_no_ident,0)
1156 Process #ident directives
1159 Common Report Var(flag_if_conversion) Optimization
1160 Perform conversion of conditional jumps to branchless equivalents
1163 Common Report Var(flag_if_conversion2) Optimization
1164 Perform conversion of conditional jumps to conditional execution
1166 ftree-loop-if-convert
1167 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1168 Convert conditional jumps in innermost loops to branchless equivalents
1170 ftree-loop-if-convert-stores
1171 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1172 Also if-convert conditional jumps containing memory writes
1174 ; -finhibit-size-directive inhibits output of .size for ELF.
1175 ; This is used only for compiling crtstuff.c,
1176 ; and it may be extended to other effects
1177 ; needed for crtstuff.c on other systems.
1178 finhibit-size-directive
1179 Common Report Var(flag_inhibit_size_directive)
1180 Do not generate .size directives
1183 Common Report Var(flag_indirect_inlining)
1184 Perform indirect inlining
1186 ; Nonzero means that functions declared `inline' will be treated
1187 ; as `static'. Prevents generation of zillions of copies of unused
1188 ; static inline functions; instead, `inlines' are written out
1189 ; only when actually used. Used in conjunction with -g. Also
1190 ; does the right thing with #pragma interface.
1192 Common Report Var(flag_no_inline,0) Init(0)
1193 Pay attention to the \"inline\" keyword
1195 finline-small-functions
1196 Common Report Var(flag_inline_small_functions) Optimization
1197 Integrate simple functions into their callers when code size is known to not growth
1200 Common Report Var(flag_inline_functions) Optimization
1201 Integrate simple functions into their callers
1203 finline-functions-called-once
1204 Common Report Var(flag_inline_functions_called_once) Init(1) Optimization
1205 Integrate functions called once into their callers
1208 Common RejectNegative Joined Alias(finline-limit=)
1211 Common RejectNegative Joined UInteger
1212 -finline-limit=<number> Limit the size of inlined functions to <number>
1214 finstrument-functions
1215 Common Report Var(flag_instrument_function_entry_exit)
1216 Instrument function entry and exit with profiling calls
1218 finstrument-functions-exclude-function-list=
1219 Common RejectNegative Joined
1220 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1222 finstrument-functions-exclude-file-list=
1223 Common RejectNegative Joined
1224 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1227 Common Report Var(flag_ipa_cp) Optimization
1228 Perform Interprocedural constant propagation
1231 Common Report Var(flag_ipa_cp_clone) Optimization
1232 Perform cloning to make Interprocedural constant propagation stronger
1235 Common Report Var(flag_ipa_profile) Init(0) Optimization
1236 Perform interprocedural profile propagation
1239 Common Report Var(flag_ipa_pta) Init(0) Optimization
1240 Perform interprocedural points-to analysis
1243 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1244 Discover pure and const functions
1247 Common Report Var(flag_ipa_reference) Init(0) Optimization
1248 Discover readonly and non addressable static variables
1251 Common Report Var(flag_ipa_matrix_reorg) Optimization
1252 Perform matrix layout flattening and transposing based
1253 on profiling information.
1257 Does nothing. Preserved for backward compatibility.
1260 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1261 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1264 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1267 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1270 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1273 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_MIXED)
1274 -fira-region=[one|all|mixed] Set regions for IRA
1277 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1280 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1283 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1286 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1289 Common Report Var(flag_ira_loop_pressure)
1290 Use IRA based register pressure calculation
1291 in RTL loop optimizations.
1293 fira-share-save-slots
1294 Common Report Var(flag_ira_share_save_slots) Init(1)
1295 Share slots for saving different hard registers.
1297 fira-share-spill-slots
1298 Common Report Var(flag_ira_share_spill_slots) Init(1)
1299 Share stack slots for spilled pseudo-registers.
1302 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1303 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1306 Common Report Var(flag_ivopts) Init(1) Optimization
1307 Optimize induction variables on trees
1310 Common Var(flag_jump_tables) Init(1) Optimization
1311 Use jump tables for sufficiently large switch statements
1313 fkeep-inline-functions
1314 Common Report Var(flag_keep_inline_functions)
1315 Generate code for functions even if they are fully inlined
1318 Common Report Var(flag_keep_static_consts) Init(1)
1319 Emit static const variables even if they are not used
1322 Common Report Var(flag_leading_underscore) Init(-1)
1323 Give external symbols a leading underscore
1327 Does nothing. Preserved for backward compatibility.
1331 Enable link-time optimization.
1334 Common RejectNegative Joined Var(flag_lto)
1335 Link-time optimization with number of parallel jobs or jobserver.
1338 Common Var(flag_lto_partition_1to1)
1339 Partition functions and vars at linktime based on object files they originate from
1341 flto-partition=balanced
1342 Common Var(flag_lto_partition_balanced)
1343 Partition functions and vars at linktime into approximately same sized buckets
1346 Common Var(flag_lto_partition_none)
1347 Disable partioning and streaming
1349 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1350 flto-compression-level=
1351 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1352 -flto-compression-level=<number> Use zlib compression level <number> for IL
1355 Common Report Var(flag_lto_report) Init(0) Optimization
1356 Report various link-time optimization statistics
1359 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1360 Set errno after built-in math functions
1363 Common Joined RejectNegative UInteger Var(flag_max_errors)
1364 -fmax-errors=<number> Maximum number of errors to report
1367 Common Report Var(mem_report)
1368 Report on permanent memory allocation
1370 ; This will attempt to merge constant section constants, if 1 only
1371 ; string constants and constants from constant pool, if 2 also constant
1373 fmerge-all-constants
1374 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1375 Attempt to merge identical constants and constant variables
1378 Common Report Var(flag_merge_constants,1) Optimization
1379 Attempt to merge identical constants across compilation units
1381 fmerge-debug-strings
1382 Common Report Var(flag_merge_debug_strings) Init(1)
1383 Attempt to merge identical debug strings across compilation units
1386 Common RejectNegative Joined UInteger
1387 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1390 Common Report Var(flag_modulo_sched) Optimization
1391 Perform SMS based modulo scheduling before the first scheduling pass
1393 fmodulo-sched-allow-regmoves
1394 Common Report Var(flag_modulo_sched_allow_regmoves)
1395 Perform SMS based modulo scheduling with register moves allowed
1397 fmove-loop-invariants
1398 Common Report Var(flag_move_loop_invariants) Init(1) Optimization
1399 Move loop invariant computations out of loops
1402 Common RejectNegative Report Var(flag_mudflap)
1403 Add mudflap bounds-checking instrumentation for single-threaded program
1406 Common RejectNegative Report Var(flag_mudflap,2)
1407 Add mudflap bounds-checking instrumentation for multi-threaded program
1410 Common RejectNegative Report Var(flag_mudflap_ignore_reads)
1411 Ignore read operations when inserting mudflap instrumentation
1414 Common Var(flag_dce) Init(1) Optimization
1415 Use the RTL dead code elimination pass
1418 Common Var(flag_dse) Init(1) Optimization
1419 Use the RTL dead store elimination pass
1421 freschedule-modulo-scheduled-loops
1422 Common Report Var(flag_resched_modulo_sched) Optimization
1423 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1425 fnon-call-exceptions
1426 Common Report Var(flag_non_call_exceptions) Optimization
1427 Support synchronous non-call exceptions
1430 Common Report Var(flag_omit_frame_pointer) Optimization
1431 When possible do not generate stack frames
1433 foptimize-register-move
1434 Common Report Var(flag_regmove) Optimization
1435 Do the full register move optimization pass
1437 foptimize-sibling-calls
1438 Common Report Var(flag_optimize_sibling_calls) Optimization
1439 Optimize sibling and tail recursive calls
1442 Common Report Var(flag_partial_inlining)
1443 Perform partial inlining
1446 Common Report Var(pre_ipa_mem_report)
1447 Report on memory allocation before interprocedural optimization
1449 fpost-ipa-mem-report
1450 Common Report Var(post_ipa_mem_report)
1451 Report on memory allocation before interprocedural optimization
1454 Common Report Var(flag_pack_struct) Optimization
1455 Pack structure members together without holes
1458 Common RejectNegative Joined UInteger Optimization
1459 -fpack-struct=<number> Set initial maximum structure member alignment
1462 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1463 Return small aggregates in memory, not registers
1466 Common Report Var(flag_peel_loops) Optimization
1467 Perform loop peeling
1470 Common Report Var(flag_no_peephole,0) Optimization
1471 Enable machine specific peephole optimizations
1474 Common Report Var(flag_peephole2) Optimization
1475 Enable an RTL peephole pass before sched2
1478 Common Report Var(flag_pic,2)
1479 Generate position-independent code if possible (large mode)
1482 Common Report Var(flag_pie,2)
1483 Generate position-independent code for executables if possible (large mode)
1486 Common Report Var(flag_pic,1)
1487 Generate position-independent code if possible (small mode)
1490 Common Report Var(flag_pie,1)
1491 Generate position-independent code for executables if possible (small mode)
1494 Common Joined RejectNegative Var(common_deferred_options) Defer
1495 Specify a plugin to load
1498 Common Joined RejectNegative Var(common_deferred_options) Defer
1499 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1501 fpredictive-commoning
1502 Common Report Var(flag_predictive_commoning) Optimization
1503 Run predictive commoning optimization.
1505 fprefetch-loop-arrays
1506 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1507 Generate prefetch instructions, if available, for arrays in loops
1510 Common Report Var(profile_flag)
1511 Enable basic program profiling code
1514 Common Report Var(profile_arc_flag)
1515 Insert arc-based program profiling code
1518 Common Joined RejectNegative Var(profile_data_prefix)
1519 Set the top-level directory for storing the profile data.
1520 The default is 'pwd'.
1523 Common Report Var(flag_profile_correction)
1524 Enable correction of flow inconsistent profile data input
1528 Enable common options for generating profile info for profile feedback directed optimizations
1531 Common Joined RejectNegative
1532 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1535 Common Var(flag_profile_use)
1536 Enable common options for performing profile feedback directed optimizations
1539 Common Joined RejectNegative
1540 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1543 Common Report Var(flag_profile_values)
1544 Insert code to profile values of expressions
1547 Common Var(common_deferred_options) Defer
1550 Common Joined RejectNegative Var(common_deferred_options) Defer
1551 -frandom-seed=<string> Make compile reproducible using <string>
1553 ; This switch causes the command line that was used to create an
1554 ; object file to be recorded into the object file. The exact format
1555 ; of this recording is target and binary file format dependent.
1556 ; It is related to the -fverbose-asm switch, but that switch only
1557 ; records information in the assembler output file as comments, so
1558 ; they never reach the object file.
1559 frecord-gcc-switches
1560 Common Report Var(flag_record_gcc_switches)
1561 Record gcc command line switches in the object file.
1564 Common Report Var(flag_pcc_struct_return,0) Optimization
1565 Return small aggregates in registers
1568 Common Report Var(flag_regmove) Optimization
1569 Enables a register move optimization
1572 Common Report Var(flag_rename_registers) Init(2) Optimization
1573 Perform a register renaming optimization pass
1576 Common Report Var(flag_reorder_blocks) Optimization
1577 Reorder basic blocks to improve code placement
1579 freorder-blocks-and-partition
1580 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1581 Reorder basic blocks and partition into hot and cold sections
1584 Common Report Var(flag_reorder_functions) Optimization
1585 Reorder functions to improve code placement
1587 frerun-cse-after-loop
1588 Common Report Var(flag_rerun_cse_after_loop) Optimization
1589 Add a common subexpression elimination pass after loop optimizations
1593 Does nothing. Preserved for backward compatibility.
1596 Common Report Var(flag_rounding_math) Optimization SetByCombined
1597 Disable optimizations that assume default FP rounding behavior
1600 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1601 Enable scheduling across basic blocks
1604 Common Report Var(flag_sched_pressure) Init(0) Optimization
1605 Enable register pressure sensitive insn scheduling
1608 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1609 Allow speculative motion of non-loads
1612 Common Report Var(flag_schedule_speculative_load) Optimization
1613 Allow speculative motion of some loads
1615 fsched-spec-load-dangerous
1616 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1617 Allow speculative motion of more loads
1620 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1621 -fsched-verbose=<number> Set the verbosity level of the scheduler
1623 fsched2-use-superblocks
1624 Common Report Var(flag_sched2_use_superblocks) Optimization
1625 If scheduling post reload, do superblock scheduling
1629 Does nothing. Preserved for backward compatibility.
1632 Common Report Var(flag_schedule_insns) Optimization
1633 Reschedule instructions before register allocation
1636 Common Report Var(flag_schedule_insns_after_reload) Optimization
1637 Reschedule instructions after register allocation
1639 ; This flag should be on when a target implements non-trivial
1640 ; scheduling hooks, maybe saving some information for its own sake.
1641 ; On IA64, for example, this is used for correct bundling.
1642 fselective-scheduling
1643 Common Report Var(flag_selective_scheduling) Optimization
1644 Schedule instructions using selective scheduling algorithm
1646 fselective-scheduling2
1647 Common Report Var(flag_selective_scheduling2) Optimization
1648 Run selective scheduling after reload
1650 fsel-sched-pipelining
1651 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1652 Perform software pipelining of inner loops during selective scheduling
1654 fsel-sched-pipelining-outer-loops
1655 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1656 Perform software pipelining of outer loops during selective scheduling
1658 fsel-sched-reschedule-pipelined
1659 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1660 Reschedule pipelined regions without pipelining
1662 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1663 ; of stalled insns into the ready list.
1664 fsched-stalled-insns
1665 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1666 Allow premature scheduling of queued insns
1668 fsched-stalled-insns=
1669 Common RejectNegative Joined UInteger
1670 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1672 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1673 ; be examined for a dependency on a stalled insn that is candidate for
1674 ; premature removal from the queue of stalled insns into the ready list (has
1675 ; an effect only if the flag 'sched_stalled_insns' is set).
1676 fsched-stalled-insns-dep
1677 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1678 Set dependence distance checking in premature scheduling of queued insns
1680 fsched-stalled-insns-dep=
1681 Common RejectNegative Joined UInteger
1682 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1684 fsched-group-heuristic
1685 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1686 Enable the group heuristic in the scheduler
1688 fsched-critical-path-heuristic
1689 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1690 Enable the critical path heuristic in the scheduler
1692 fsched-spec-insn-heuristic
1693 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1694 Enable the speculative instruction heuristic in the scheduler
1696 fsched-rank-heuristic
1697 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1698 Enable the rank heuristic in the scheduler
1700 fsched-last-insn-heuristic
1701 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1702 Enable the last instruction heuristic in the scheduler
1704 fsched-dep-count-heuristic
1705 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1706 Enable the dependent count heuristic in the scheduler
1709 Common Report Var(flag_section_anchors) Optimization
1710 Access data in the same section from shared anchor points
1714 Does nothing. Preserved for backward compatibility.
1717 Common Report Var(flag_zee) Init(0)
1718 Eliminate redundant zero extensions on targets that support implicit extensions.
1721 Common Report Var(flag_show_column) Init(1)
1722 Show column numbers in diagnostics, when available. Default on
1725 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1726 Disable optimizations observable by IEEE signaling NaNs
1729 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1730 Disable floating point optimizations that ignore the IEEE signedness of zero
1732 fsingle-precision-constant
1733 Common Report Var(flag_single_precision_constant) Optimization
1734 Convert floating point constants to single precision constants
1736 fsplit-ivs-in-unroller
1737 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1738 Split lifetimes of induction variables when loops are unrolled
1741 Common Report Var(flag_split_stack) Init(-1)
1742 Generate discontiguous stack frames
1745 Common Report Var(flag_split_wide_types) Optimization
1746 Split wide types into independent registers
1748 fvariable-expansion-in-unroller
1749 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1750 Apply variable expansion when loops are unrolled
1753 Common Report RejectNegative Joined
1754 -fstack-check=[no|generic|specific] Insert stack checking code into the program
1757 Common Alias(fstack-check=, specific, no)
1758 Insert stack checking code into the program. Same as -fstack-check=specific
1761 Common Var(common_deferred_options) Defer
1763 fstack-limit-register=
1764 Common RejectNegative Joined Var(common_deferred_options) Defer
1765 -fstack-limit-register=<register> Trap if the stack goes past <register>
1767 fstack-limit-symbol=
1768 Common RejectNegative Joined Var(common_deferred_options) Defer
1769 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
1772 Common Report Var(flag_stack_protect, 1)
1773 Use propolice as a stack protection method
1775 fstack-protector-all
1776 Common Report RejectNegative Var(flag_stack_protect, 2)
1777 Use a stack protection method for every function
1780 Common RejectNegative Var(flag_stack_usage)
1781 Output stack usage information on a per-function basis
1785 Does nothing. Preserved for backward compatibility.
1787 ; Nonzero if we should do (language-dependent) alias analysis.
1788 ; Typically, this analysis will assume that expressions of certain
1789 ; types do not alias expressions of certain other types. Only used
1790 ; if alias analysis (in general) is enabled.
1792 Common Report Var(flag_strict_aliasing) Optimization
1793 Assume strict aliasing rules apply
1796 Common Report Var(flag_strict_overflow)
1797 Treat signed overflow as undefined
1800 Common Report Var(flag_syntax_only)
1801 Check for syntax errors, then stop
1804 Common Report Var(flag_test_coverage)
1805 Create data files needed by \"gcov\"
1808 Common Report Var(flag_thread_jumps) Optimization
1809 Perform jump threading optimizations
1812 Common Report Var(time_report)
1813 Report the time taken by each compiler pass
1816 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
1817 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
1820 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
1823 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
1826 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
1829 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
1832 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
1835 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
1836 Reorder top level functions, variables, and asms
1839 Common Report Var(flag_tracer)
1840 Perform superblock formation via tail duplication
1842 ; Zero means that floating-point math operations cannot generate a
1843 ; (user-visible) trap. This is the case, for example, in nonstop
1844 ; IEEE 754 arithmetic.
1846 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
1847 Assume floating-point operations can trap
1850 Common Report Var(flag_trapv) Optimization
1851 Trap for signed overflow in addition, subtraction and multiplication
1854 Common Report Var(flag_tree_ccp) Optimization
1855 Enable SSA-CCP optimization on trees
1858 Common Report Var(flag_tree_bit_ccp) Optimization
1859 Enable SSA-BIT-CCP optimization on trees
1863 Does nothing. Preserved for backward compatibility.
1866 Common Report Var(flag_tree_ch) Optimization
1867 Enable loop header copying on trees
1870 Common Report Var(flag_tree_copyrename) Optimization
1871 Replace SSA temporaries with better names in copies
1874 Common Report Var(flag_tree_copy_prop) Optimization
1875 Enable copy propagation on trees
1877 ftree-store-copy-prop
1879 Does nothing. Preserved for backward compatibility.
1882 Common Report Var(flag_tree_cselim) Init(2) Optimization
1883 Transform condition stores into unconditional ones
1885 ftree-switch-conversion
1886 Common Report Var(flag_tree_switch_conversion) Optimization
1887 Perform conversions of switch initializations.
1890 Common Report Var(flag_tree_dce) Optimization
1891 Enable SSA dead code elimination optimization on trees
1893 ftree-dominator-opts
1894 Common Report Var(flag_tree_dom) Optimization
1895 Enable dominator optimizations
1898 Common Report Var(flag_tree_dse) Optimization
1899 Enable dead store elimination
1902 Common Report Var(flag_tree_forwprop) Init(1) Optimization
1903 Enable forward propagation on trees
1906 Common Report Var(flag_tree_fre) Optimization
1907 Enable Full Redundancy Elimination (FRE) on trees
1909 ftree-loop-distribution
1910 Common Report Var(flag_tree_loop_distribution) Optimization
1911 Enable loop distribution on trees
1913 ftree-loop-distribute-patterns
1914 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
1915 Enable loop distribution for patterns transformed into a library call
1918 Common Report Var(flag_tree_loop_im) Init(1) Optimization
1919 Enable loop invariant motion on trees
1922 Common Alias(floop-interchange)
1923 Enable loop interchange transforms. Same as -floop-interchange
1926 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
1927 Create canonical induction variables in loops
1930 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
1931 Enable loop optimizations on tree level
1933 ftree-parallelize-loops=
1934 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
1935 Enable automatic parallelization of loops
1938 Common Report Var(flag_tree_phiprop) Init(1) Optimization
1939 Enable hoisting loads from conditional pointers.
1942 Common Report Var(flag_tree_pre) Optimization
1943 Enable SSA-PRE optimization on trees
1946 Common Report Var(flag_tree_pta) Init(1) Optimization
1947 Perform function-local points-to analysis on trees.
1950 Common Report Var(flag_tree_reassoc) Init(1) Optimization
1951 Enable reassociation on tree level
1955 Does nothing. Preserved for backward compatibility.
1958 Common Report Var(flag_tree_sink) Optimization
1959 Enable SSA code sinking on trees
1962 Common Report Var(flag_tree_sra) Optimization
1963 Perform scalar replacement of aggregates
1966 Common Report Var(flag_tree_ter) Optimization
1967 Replace temporary expressions in the SSA->normal pass
1970 Common Report Var(flag_tree_live_range_split) Optimization
1971 Perform live range splitting during the SSA->normal pass
1974 Common Report Var(flag_tree_vrp) Init(0) Optimization
1975 Perform Value Range Propagation on trees
1978 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
1979 Compile whole compilation unit at a time
1982 Common Report Var(flag_unroll_loops) Optimization
1983 Perform loop unrolling when iteration count is known
1986 Common Report Var(flag_unroll_all_loops) Optimization
1987 Perform loop unrolling for all loops
1989 ; Nonzero means that loop optimizer may assume that the induction variables
1990 ; that control loops do not overflow and that the loops with nontrivial
1991 ; exit condition are not infinite
1992 funsafe-loop-optimizations
1993 Common Report Var(flag_unsafe_loop_optimizations) Optimization
1994 Allow loop optimizations to assume that the loops behave in normal way
1997 Common Report Var(flag_associative_math) SetByCombined
1998 Allow optimization for floating-point arithmetic which may change the
1999 result of the operation due to rounding.
2002 Common Report Var(flag_reciprocal_math) SetByCombined
2003 Same as -fassociative-math for expressions which include division.
2005 ; Nonzero means that unsafe floating-point math optimizations are allowed
2006 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2007 ; are allowed to assume that their arguments and results are "normal"
2008 ; (e.g., nonnegative for SQRT).
2009 funsafe-math-optimizations
2010 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2011 Allow math optimizations that may violate IEEE or ISO standards
2014 Common Report Var(flag_unswitch_loops) Optimization
2015 Perform loop unswitching
2018 Common Report Var(flag_unwind_tables) Optimization
2019 Just generate unwind tables for exception handling
2024 ; Positive if we should track variables, negative if we should run
2025 ; the var-tracking pass only to discard debug annotations, zero if
2026 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2027 ; will be set according to optimize, debug_info_level and debug_hooks
2028 ; in process_options ().
2030 Common Report Var(flag_var_tracking) Init(2) Optimization
2031 Perform variable tracking
2033 ; Positive if we should track variables at assignments, negative if
2034 ; we should run the var-tracking pass only to discard debug
2035 ; annotations. When flag_var_tracking_assignments ==
2036 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2037 fvar-tracking-assignments
2038 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2039 Perform variable tracking by annotating assignments
2041 ; Nonzero if we should toggle flag_var_tracking_assignments after
2042 ; processing options and computing its default. */
2043 fvar-tracking-assignments-toggle
2044 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2045 Toggle -fvar-tracking-assignments
2047 fvar-tracking-uninit
2048 Common Report Var(flag_var_tracking_uninit) Optimization
2049 Perform variable tracking and also tag variables that are uninitialized
2052 Common Report Var(flag_tree_vectorize) Optimization
2053 Enable loop vectorization on trees
2056 Common Report Var(flag_tree_slp_vectorize) Init(2) Optimization
2057 Enable basic block vectorization (SLP) on trees
2060 Common Report Var(flag_vect_cost_model) Optimization
2061 Enable use of cost model in vectorization
2063 ftree-vect-loop-version
2064 Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization
2065 Enable loop versioning when doing loop vectorization on trees
2067 ftree-vectorizer-verbose=
2068 Common RejectNegative Joined UInteger
2069 -ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
2072 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2073 Enable copy propagation of scalar-evolution information.
2075 ; -fverbose-asm causes extra commentary information to be produced in
2076 ; the generated assembly code (to make it more readable). This option
2077 ; is generally only of use to those who actually need to read the
2078 ; generated assembly code (perhaps while debugging the compiler itself).
2079 ; -fno-verbose-asm, the default, causes the extra information
2080 ; to not be added and is useful when comparing two assembler files.
2082 Common Report Var(flag_verbose_asm)
2083 Add extra commentary to assembler output
2086 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2087 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2090 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2093 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2096 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2099 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2102 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2105 Common Report Var(flag_value_profile_transformations) Optimization
2106 Use expression value profiles in optimizations
2109 Common Report Var(flag_web) Init(2) Optimization
2110 Construct webs and split unrelated uses of single variable
2112 ftree-builtin-call-dce
2113 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2114 Enable conditional dead code elimination for builtin calls
2117 Common Report Var(flag_whole_program) Init(0) Optimization
2118 Perform whole program optimizations
2121 Common Report Var(flag_wrapv) Optimization
2122 Assume signed arithmetic overflow wraps around
2124 fzero-initialized-in-bss
2125 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2126 Put zero initialized data in the bss section
2129 Common JoinedOrMissing
2130 Generate debug information in default format
2133 Common JoinedOrMissing Negative(gdwarf-)
2134 Generate debug information in COFF format
2137 Common Joined UInteger Var(dwarf_version) Init(2) Negative(gstabs)
2138 Generate debug information in DWARF v2 (or later) format
2141 Common JoinedOrMissing
2142 Generate debug information in default extended format
2145 Common JoinedOrMissing Negative(gstabs+)
2146 Generate debug information in STABS format
2149 Common JoinedOrMissing Negative(gvms)
2150 Generate debug information in extended STABS format
2153 Common RejectNegative Var(dwarf_strict,0) Init(-1)
2154 Emit DWARF additions beyond selected version
2157 Common Report RejectNegative Var(dwarf_strict,1)
2158 Don't emit DWARF additions beyond selected version
2161 Common Report Var(flag_gtoggle)
2162 Toggle debug information generation
2165 Common JoinedOrMissing Negative(gxcoff)
2166 Generate debug information in VMS format
2169 Common JoinedOrMissing Negative(gxcoff+)
2170 Generate debug information in XCOFF format
2173 Common JoinedOrMissing Negative(gcoff)
2174 Generate debug information in extended XCOFF format
2177 Driver Joined Separate
2180 Common Joined Var(plugindir_string) Init(0)
2181 -iplugindir=<dir> Set <dir> to be the default plugin directory
2184 Driver Joined Separate
2189 no-canonical-prefixes
2202 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2203 -o <file> Place output into <file>
2206 Common Var(profile_flag)
2207 Enable function profiling
2210 Driver Var(pass_exit_codes)
2213 Common Var(pedantic)
2214 Issue warnings needed for strict compliance to the standard
2217 Common Var(flag_pedantic_errors)
2218 Like -pedantic but issue them as errors
2224 Driver Var(use_pipes)
2227 Driver JoinedOrMissing Var(print_file_name)
2229 print-libgcc-file-name
2232 print-multi-directory
2233 Driver Var(print_multi_directory)
2236 Driver Var(print_multi_lib)
2238 print-multi-os-directory
2239 Driver Var(print_multi_os_directory)
2242 Driver JoinedOrMissing Var(print_prog_name)
2245 Driver Var(print_search_dirs)
2248 Driver Var(print_sysroot)
2250 print-sysroot-headers-suffix
2251 Driver Var(print_sysroot_headers_suffix)
2254 Common Var(quiet_flag) RejectDriver
2255 Do not display functions compiled or elapsed time
2273 Driver Var(report_times)
2276 Driver JoinedOrMissing
2279 Driver Joined Separate
2283 ; C option, but driver must not handle as "-u ndef".
2286 Common Driver Var(verbose_flag)
2287 Enable verbose output
2290 Common Var(version_flag) RejectDriver
2291 Display the compiler's version
2294 Common Var(inhibit_warnings)
2298 Driver Separate Var(wrapper_string)
2301 Driver Joined Separate
2304 Common RejectNegative Negative(pie)
2305 Create a shared library
2311 Driver Separate Alias(specs=)
2324 ; Documented for Fortran, but always accepted by driver.
2331 ; Documented for Go, but always accepted by driver.
2337 Common RejectNegative Negative(shared)
2338 Create a position independent executable
2341 Driver Joined Separate
2343 ; This comment is to ensure we retain the blank line above.