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
475 Common RejectNegative Warning Alias(Wextra)
476 This switch is deprecated; use -Wextra instead
479 Driver JoinedOrMissing
482 Driver JoinedOrMissing
485 Driver JoinedOrMissing
488 Common Var(warn_aggregate_return) Warning
489 Warn about returning structures, unions or arrays
492 Common Var(warn_array_bounds) Warning
493 Warn if an array is accessed out of bounds
496 Common Var(warn_attributes) Init(1) Warning
497 Warn about inappropriate attribute usage
500 Common Var(warn_cast_align) Warning
501 Warn about pointer casts which increase alignment
504 Common Var(warn_cpp) Init(1) Warning
505 Warn when a #warning directive is encountered
507 Wdeprecated-declarations
508 Common Var(warn_deprecated_decl) Init(1) Warning
509 Warn about uses of __attribute__((deprecated)) declarations
511 Wdisabled-optimization
512 Common Var(warn_disabled_optimization) Warning
513 Warn when an optimization pass is disabled
516 Common Var(warnings_are_errors)
517 Treat all warnings as errors
521 Treat specified warning as error
524 Common Var(extra_warnings) Warning
525 Print extra (possibly unwanted) warnings
528 Common Var(flag_fatal_errors)
529 Exit on the first error occurred
532 Common RejectNegative Joined UInteger
533 -Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
536 Common Var(warn_inline) Warning
537 Warn when an inlined function cannot be inlined
540 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
543 Common RejectNegative Joined UInteger Warning
544 -Wlarger-than=<number> Warn if an object is larger than <number> bytes
546 Wunsafe-loop-optimizations
547 Common Var(warn_unsafe_loop_optimizations) Warning
548 Warn if the loop cannot be optimized due to nontrivial assumptions.
551 Common Var(warn_missing_noreturn) Warning
552 Warn about functions which might be candidates for __attribute__((noreturn))
555 Common Var(warn_mudflap) Init(1) Warning
556 Warn about constructs not instrumented by -fmudflap
559 Common Var(warn_overflow) Init(1) Warning
560 Warn about overflow in arithmetic expressions
563 Common Var(warn_packed) Warning
564 Warn when the packed attribute has no effect on struct layout
567 Common Var(warn_padded) Warning
568 Warn when padding is required to align structure members
571 Common Var(warn_shadow) Warning
572 Warn when one local variable shadows another
575 Common Var(warn_stack_protect) Warning
576 Warn when not issuing stack smashing protection for some reason
580 Warn about code which might break strict aliasing rules
583 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Init(-1) Warning
584 Warn about code which might break strict aliasing rules
588 Warn about optimizations that assume that signed overflow is undefined
591 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Init(-1) Warning
592 Warn about optimizations that assume that signed overflow is undefined
594 Wsuggest-attribute=const
595 Common Var(warn_suggest_attribute_const) Warning
596 Warn about functions which might be candidates for __attribute__((const))
598 Wsuggest-attribute=pure
599 Common Var(warn_suggest_attribute_pure) Warning
600 Warn about functions which might be candidates for __attribute__((pure))
602 Wsuggest-attribute=noreturn
603 Common Var(warn_suggest_attribute_noreturn) Warning
604 Warn about functions which might be candidates for __attribute__((noreturn))
607 Common Var(warn_switch) Warning
608 Warn about enumerated switches, with no default, missing a case
611 Common Var(warn_switch_default) Warning
612 Warn about enumerated switches missing a \"default:\" statement
615 Common Var(warn_switch_enum) Warning
616 Warn about all enumerated switches missing a specific case
619 Common Var(warn_system_headers) Warning
620 Do not suppress warnings from system headers
623 Common Var(warn_trampolines) Warning
624 Warn whenever a trampoline is generated
627 Common Var(warn_type_limits) Init(-1) Warning
628 Warn if a comparison is always true or always false due to the limited range of the data type
631 Common Var(warn_uninitialized) Init(-1) Warning
632 Warn about uninitialized automatic variables
636 Does nothing. Preserved for backward compatibility.
639 Common Var(warn_unused) Init(0) Warning
640 Enable all -Wunused- warnings
642 Wunused-but-set-parameter
643 Common Var(warn_unused_but_set_parameter) Init(-1) Warning
644 Warn when a function parameter is only set, otherwise unused
646 Wunused-but-set-variable
647 Common Var(warn_unused_but_set_variable) Init(-1) Warning
648 Warn when a variable is only set, otherwise unused
651 Common Var(warn_unused_function) Init(-1) Warning
652 Warn when a function is unused
655 Common Var(warn_unused_label) Init(-1) Warning
656 Warn when a label is unused
659 Common Var(warn_unused_parameter) Init(-1) Warning
660 Warn when a function parameter is unused
663 Common Var(warn_unused_value) Init(-1) Warning
664 Warn when an expression value is unused
667 Common Var(warn_unused_variable) Init(-1) Warning
668 Warn when a variable is unused
671 Common Var(warn_coverage_mismatch) Init(1) Warning
672 Warn in case profiles in -fprofile-use do not match
687 Common Separate Var(aux_info_file_name)
688 -aux-info <file> Emit declaration information into <file>
691 Common Joined Alias(aux-info)
694 Common Separate RejectDriver Var(aux_base_name)
697 Common Separate RejectDriver
707 -d<letters> Enable dumps from specific passes of the compiler
710 Common Separate Var(dump_base_name)
711 -dumpbase <file> Set the file basename to be used for dumps
714 Common Separate Var(dump_dir_name)
715 -dumpdir <dir> Set the directory name to be used for dumps
727 Driver Joined Separate
729 ; This option has historically been passed down to the linker by an
730 ; accident of a %{e*} spec, so ensure it continues to be passed down
731 ; as a single option. The supported option for this purpose is
732 ; -rdynamic. See PR 47390.
736 ; The version of the C++ ABI in use. The following values are allowed:
738 ; 0: The version of the ABI believed most conformant with the C++ ABI
739 ; specification. This ABI may change as bugs are discovered and fixed.
740 ; Therefore, 0 will not necessarily indicate the same ABI in different
743 ; 1: The version of the ABI first used in G++ 3.2.
745 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
747 ; 3: The version of the ABI that fixes the missing underscore
748 ; in template non-type arguments of pointer type.
750 ; 4: The version of the ABI that introduces unambiguous mangling of
751 ; vector types. First selectable in G++ 4.5.
753 ; 5: The version of the ABI that ignores attribute const/noreturn
754 ; in function pointer mangling, and corrects mangling of decltype and
755 ; function parameters used in other parameters and the return type.
756 ; First selectable in G++ 4.6.
758 ; Additional positive integers will be assigned as new versions of
759 ; the ABI become the default version of the ABI.
761 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(2)
764 Common Report Var(align_functions,0) Optimization UInteger
765 Align the start of functions
768 Common RejectNegative Joined UInteger Var(align_functions)
771 Common Report Var(align_jumps,0) Optimization UInteger
772 Align labels which are only reached by jumping
775 Common RejectNegative Joined UInteger Var(align_jumps)
778 Common Report Var(align_labels,0) Optimization UInteger
782 Common RejectNegative Joined UInteger Var(align_labels)
785 Common Report Var(align_loops,0) Optimization UInteger
786 Align the start of loops
789 Common RejectNegative Joined UInteger Var(align_loops)
793 Does nothing. Preserved for backward compatibility.
797 Does nothing. Preserved for backward compatibility.
799 fargument-noalias-global
801 Does nothing. Preserved for backward compatibility.
803 fargument-noalias-anything
805 Does nothing. Preserved for backward compatibility.
807 fasynchronous-unwind-tables
808 Common Report Var(flag_asynchronous_unwind_tables) Optimization
809 Generate unwind tables that are exact at each instruction boundary
812 Common Report Var(flag_auto_inc_dec) Init(1)
813 Generate auto-inc/dec instructions
815 ; -fcheck-bounds causes gcc to generate array bounds checks.
816 ; For C, C++ and ObjC: defaults off.
817 ; For Java: defaults to on.
818 ; For Fortran: defaults to off.
820 Common Report Var(flag_bounds_check)
821 Generate code to check bounds before indexing arrays
824 Common Report Var(flag_branch_on_count_reg) Init(1) Optimization
825 Replace add, compare, branch with branch on count register
827 fbranch-probabilities
828 Common Report Var(flag_branch_probabilities) Optimization
829 Use profiling information for branch probabilities
831 fbranch-target-load-optimize
832 Common Report Var(flag_branch_target_load_optimize) Optimization
833 Perform branch target load optimization before prologue / epilogue threading
835 fbranch-target-load-optimize2
836 Common Report Var(flag_branch_target_load_optimize2) Optimization
837 Perform branch target load optimization after prologue / epilogue threading
840 Common Report Var(flag_btr_bb_exclusive) Optimization
841 Restrict target load migration not to re-use registers in any basic block
844 Common Joined RejectNegative Var(common_deferred_options) Defer
845 -fcall-saved-<register> Mark <register> as being preserved across functions
848 Common Joined RejectNegative Var(common_deferred_options) Defer
849 -fcall-used-<register> Mark <register> as being corrupted by function calls
851 ; Nonzero for -fcaller-saves: allocate values in regs that need to
852 ; be saved across function calls, if that produces overall better code.
853 ; Optional now, so people can test it.
855 Common Report Var(flag_caller_saves) Optimization
856 Save registers around function calls
859 Common Report Var(flag_check_data_deps)
860 Compare the results of several data dependence analyzers.
862 fcombine-stack-adjustments
863 Common Report Var(flag_combine_stack_adjustments) Optimization
864 Looks for opportunities to reduce stack adjustments and stack references.
867 Common Report Var(flag_no_common,0) Optimization
868 Do not put uninitialized globals in the common section
872 ; Converted by the driver to -fcompare-debug= options.
875 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
876 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
878 fcompare-debug-second
879 Common Driver RejectNegative Var(flag_compare_debug)
880 Run only the second compilation of -fcompare-debug
883 Common Report Var(flag_compare_elim_after_reload) Optimization
884 Perform comparison elimination after register allocation has finished
887 Common Var(flag_conserve_stack) Optimization
888 Do not perform optimizations increasing noticeably stack usage
891 Common Report Var(flag_cprop_registers) Optimization
892 Perform a register copy-propagation optimization pass
895 Common Report Var(flag_crossjumping) Optimization
896 Perform cross-jumping optimization
899 Common Report Var(flag_cse_follow_jumps) Optimization
900 When running CSE, follow jumps to their targets
904 Does nothing. Preserved for backward compatibility.
907 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
908 Omit range reduction step when performing complex division
911 Common Report Var(flag_cx_fortran_rules) Optimization
912 Complex multiplication and division follow Fortran rules
915 Common Report Var(flag_data_sections) Optimization
916 Place data items into their own section
919 Common Report Var(common_deferred_options) Defer
920 List all available debugging counters with their limits and counts.
923 Common RejectNegative Joined Var(common_deferred_options) Defer
924 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
927 Common Joined RejectNegative Var(common_deferred_options) Defer
928 Map one directory name to another in debug information
930 ; Nonzero for -fdefer-pop: don't pop args after each function call
931 ; instead save them up to pop many calls' args with one insns.
933 Common Report Var(flag_defer_pop) Optimization
934 Defer popping functions args from stack until later
937 Common Report Var(flag_delayed_branch) Optimization
938 Attempt to fill delay slots of branch instructions
940 fdelete-null-pointer-checks
941 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
942 Delete useless null pointer checks
945 Common Report Var(flag_devirtualize) Optimization
946 Try to convert virtual calls to direct ones.
948 fdiagnostics-show-location=
949 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
950 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
952 ; Required for these enum values.
957 Name(diagnostic_prefixing_rule) Type(int)
960 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
963 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
965 fdiagnostics-show-option
966 Common Var(flag_diagnostics_show_option) Init(1)
967 Amend appropriate diagnostic messages with the command line option that controls them
970 Common Joined RejectNegative Var(common_deferred_options) Defer
971 -fdump-<type> Dump various compiler internals to a file
974 Driver RejectNegative
977 Common RejectNegative Joined Var(flag_dump_final_insns)
978 -fdump-final-insns=filename Dump to filename the insns at the end of translation
981 Common RejectNegative Joined Var(flag_dump_go_spec)
982 -fdump-go-spec=filename Write all declarations to file as Go code
985 Common Report Var(flag_dump_noaddr)
986 Suppress output of addresses in debugging dumps
989 Common Report Var(flag_dump_unnumbered)
990 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
992 fdump-unnumbered-links
993 Common Report Var(flag_dump_unnumbered_links)
994 Suppress output of previous and next insn numbers in debugging dumps
997 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
998 Enable CFI tables via GAS assembler directives.
1001 Common Report Var(flag_early_inlining) Init(1) Optimization
1002 Perform early inlining
1004 feliminate-dwarf2-dups
1005 Common Report Var(flag_eliminate_dwarf2_dups)
1006 Perform DWARF2 duplicate elimination
1009 Common Report Var(flag_ipa_sra) Init(0) Optimization
1010 Perform interprocedural reduction of aggregates
1012 feliminate-unused-debug-symbols
1013 Common Report Var(flag_debug_only_used_symbols)
1014 Perform unused type elimination in debug info
1016 feliminate-unused-debug-types
1017 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1018 Perform unused type elimination in debug info
1020 femit-class-debug-always
1021 Common Report Var(flag_emit_class_debug_always) Init(0)
1022 Do not suppress C++ class debug information.
1025 Common Report Var(flag_enable_icf_debug)
1026 Generate debug information to support Identical Code Folding (ICF)
1029 Common Report Var(flag_exceptions) Optimization
1030 Enable exception handling
1032 fexpensive-optimizations
1033 Common Report Var(flag_expensive_optimizations) Optimization
1034 Perform a number of minor, expensive optimizations
1037 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1038 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1041 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1044 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1047 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1053 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1054 Assume no NaNs or infinities are generated
1057 Common Joined RejectNegative Var(common_deferred_options) Defer
1058 -ffixed-<register> Mark <register> as being unavailable to the compiler
1061 Common Report Var(flag_float_store) Optimization
1062 Don't allocate floats and doubles in extended-precision registers
1066 Does nothing. Preserved for backward compatibility.
1069 Common Report Var(flag_forward_propagate) Optimization
1070 Perform a forward propagation pass on RTL
1073 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1074 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1077 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1080 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1082 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1084 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1087 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1089 ; Nonzero means don't put addresses of constant functions in registers.
1090 ; Used for compiling the Unix kernel, where strange substitutions are
1091 ; done on the assembly output.
1093 Common Report Var(flag_no_function_cse,0)
1094 Allow function addresses to be held in registers
1097 Common Report Var(flag_function_sections)
1098 Place each function into its own section
1101 Common Report Var(flag_gcse) Optimization
1102 Perform global common subexpression elimination
1105 Common Report Var(flag_gcse_lm) Init(1) Optimization
1106 Perform enhanced load motion during global common subexpression elimination
1109 Common Report Var(flag_gcse_sm) Init(0) Optimization
1110 Perform store motion after global common subexpression elimination
1113 Common Report Var(flag_gcse_las) Init(0) Optimization
1114 Perform redundant load after store elimination in global common subexpression
1118 Common Report Var(flag_gcse_after_reload) Optimization
1119 Perform global common subexpression elimination after register allocation
1122 ; This option is not documented yet as its semantics will change.
1124 Common Report Var(flag_graphite)
1125 Enable in and out of Graphite representation
1128 Common Report Var(flag_graphite_identity) Optimization
1129 Enable Graphite Identity transformation
1131 floop-parallelize-all
1132 Common Report Var(flag_loop_parallelize_all) Optimization
1133 Mark all loops as parallel
1136 Common Report Var(flag_loop_strip_mine) Optimization
1137 Enable Loop Strip Mining transformation
1140 Common Report Var(flag_loop_interchange) Optimization
1141 Enable Loop Interchange transformation
1144 Common Report Var(flag_loop_block) Optimization
1145 Enable Loop Blocking transformation
1148 Common Report Var(flag_loop_flatten) Optimization
1149 Enable Loop Flattening transformation
1151 fstrict-volatile-bitfields
1152 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1153 Force bitfield accesses to match their type width
1155 fguess-branch-probability
1156 Common Report Var(flag_guess_branch_prob) Optimization
1157 Enable guessing of branch probabilities
1159 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1160 ; Generate position-independent code for executables if possible
1161 ; On SVR4 targets, it also controls whether or not to emit a
1162 ; string identifying the compiler.
1164 Common Report Var(flag_no_ident,0)
1165 Process #ident directives
1168 Common Report Var(flag_if_conversion) Optimization
1169 Perform conversion of conditional jumps to branchless equivalents
1172 Common Report Var(flag_if_conversion2) Optimization
1173 Perform conversion of conditional jumps to conditional execution
1175 ftree-loop-if-convert
1176 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1177 Convert conditional jumps in innermost loops to branchless equivalents
1179 ftree-loop-if-convert-stores
1180 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1181 Also if-convert conditional jumps containing memory writes
1183 ; -finhibit-size-directive inhibits output of .size for ELF.
1184 ; This is used only for compiling crtstuff.c,
1185 ; and it may be extended to other effects
1186 ; needed for crtstuff.c on other systems.
1187 finhibit-size-directive
1188 Common Report Var(flag_inhibit_size_directive)
1189 Do not generate .size directives
1192 Common Report Var(flag_indirect_inlining)
1193 Perform indirect inlining
1195 ; Nonzero means that functions declared `inline' will be treated
1196 ; as `static'. Prevents generation of zillions of copies of unused
1197 ; static inline functions; instead, `inlines' are written out
1198 ; only when actually used. Used in conjunction with -g. Also
1199 ; does the right thing with #pragma interface.
1201 Common Report Var(flag_no_inline,0) Init(0)
1202 Pay attention to the \"inline\" keyword
1204 finline-small-functions
1205 Common Report Var(flag_inline_small_functions) Optimization
1206 Integrate simple functions into their callers when code size is known to not growth
1209 Common Report Var(flag_inline_functions) Optimization
1210 Integrate simple functions into their callers
1212 finline-functions-called-once
1213 Common Report Var(flag_inline_functions_called_once) Init(1) Optimization
1214 Integrate functions called once into their callers
1217 Common RejectNegative Joined Alias(finline-limit=)
1220 Common RejectNegative Joined UInteger
1221 -finline-limit=<number> Limit the size of inlined functions to <number>
1223 finstrument-functions
1224 Common Report Var(flag_instrument_function_entry_exit)
1225 Instrument function entry and exit with profiling calls
1227 finstrument-functions-exclude-function-list=
1228 Common RejectNegative Joined
1229 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1231 finstrument-functions-exclude-file-list=
1232 Common RejectNegative Joined
1233 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1236 Common Report Var(flag_ipa_cp) Optimization
1237 Perform Interprocedural constant propagation
1240 Common Report Var(flag_ipa_cp_clone) Optimization
1241 Perform cloning to make Interprocedural constant propagation stronger
1244 Common Report Var(flag_ipa_profile) Init(0) Optimization
1245 Perform interprocedural profile propagation
1248 Common Report Var(flag_ipa_pta) Init(0) Optimization
1249 Perform interprocedural points-to analysis
1252 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1253 Discover pure and const functions
1256 Common Report Var(flag_ipa_reference) Init(0) Optimization
1257 Discover readonly and non addressable static variables
1260 Common Report Var(flag_ipa_matrix_reorg) Optimization
1261 Perform matrix layout flattening and transposing based
1262 on profiling information.
1265 Common Report Var(flag_ipa_struct_reorg)
1266 Perform structure layout optimizations based
1267 on profiling information.
1270 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1271 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1274 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1277 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1280 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1283 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_MIXED)
1284 -fira-region=[one|all|mixed] Set regions for IRA
1287 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1290 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1293 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1296 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1299 Common Report Var(flag_ira_loop_pressure)
1300 Use IRA based register pressure calculation
1301 in RTL loop optimizations.
1303 fira-share-save-slots
1304 Common Report Var(flag_ira_share_save_slots) Init(1)
1305 Share slots for saving different hard registers.
1307 fira-share-spill-slots
1308 Common Report Var(flag_ira_share_spill_slots) Init(1)
1309 Share stack slots for spilled pseudo-registers.
1312 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1313 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1316 Common Report Var(flag_ivopts) Init(1) Optimization
1317 Optimize induction variables on trees
1320 Common Var(flag_jump_tables) Init(1) Optimization
1321 Use jump tables for sufficiently large switch statements
1323 fkeep-inline-functions
1324 Common Report Var(flag_keep_inline_functions)
1325 Generate code for functions even if they are fully inlined
1328 Common Report Var(flag_keep_static_consts) Init(1)
1329 Emit static const variables even if they are not used
1332 Common Report Var(flag_leading_underscore) Init(-1)
1333 Give external symbols a leading underscore
1337 Does nothing. Preserved for backward compatibility.
1341 Enable link-time optimization.
1344 Common RejectNegative Joined Var(flag_lto)
1345 Link-time optimization with number of parallel jobs or jobserver.
1348 Common Var(flag_lto_partition_1to1)
1349 Partition functions and vars at linktime based on object files they originate from
1351 flto-partition=balanced
1352 Common Var(flag_lto_partition_balanced)
1353 Partition functions and vars at linktime into approximately same sized buckets
1356 Common Var(flag_lto_partition_none)
1357 Disable partioning and streaming
1359 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1360 flto-compression-level=
1361 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1362 -flto-compression-level=<number> Use zlib compression level <number> for IL
1365 Common Report Var(flag_lto_report) Init(0) Optimization
1366 Report various link-time optimization statistics
1369 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1370 Set errno after built-in math functions
1373 Common Joined RejectNegative UInteger Var(flag_max_errors)
1374 -fmax-errors=<number> Maximum number of errors to report
1377 Common Report Var(mem_report)
1378 Report on permanent memory allocation
1380 ; This will attempt to merge constant section constants, if 1 only
1381 ; string constants and constants from constant pool, if 2 also constant
1383 fmerge-all-constants
1384 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1385 Attempt to merge identical constants and constant variables
1388 Common Report Var(flag_merge_constants,1) Optimization
1389 Attempt to merge identical constants across compilation units
1391 fmerge-debug-strings
1392 Common Report Var(flag_merge_debug_strings) Init(1)
1393 Attempt to merge identical debug strings across compilation units
1396 Common RejectNegative Joined UInteger
1397 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1400 Common Report Var(flag_modulo_sched) Optimization
1401 Perform SMS based modulo scheduling before the first scheduling pass
1403 fmodulo-sched-allow-regmoves
1404 Common Report Var(flag_modulo_sched_allow_regmoves)
1405 Perform SMS based modulo scheduling with register moves allowed
1407 fmove-loop-invariants
1408 Common Report Var(flag_move_loop_invariants) Init(1) Optimization
1409 Move loop invariant computations out of loops
1412 Common RejectNegative Report Var(flag_mudflap)
1413 Add mudflap bounds-checking instrumentation for single-threaded program
1416 Common RejectNegative Report Var(flag_mudflap,2)
1417 Add mudflap bounds-checking instrumentation for multi-threaded program
1420 Common RejectNegative Report Var(flag_mudflap_ignore_reads)
1421 Ignore read operations when inserting mudflap instrumentation
1424 Common Var(flag_dce) Init(1) Optimization
1425 Use the RTL dead code elimination pass
1428 Common Var(flag_dse) Init(1) Optimization
1429 Use the RTL dead store elimination pass
1431 freschedule-modulo-scheduled-loops
1432 Common Report Var(flag_resched_modulo_sched) Optimization
1433 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1435 fnon-call-exceptions
1436 Common Report Var(flag_non_call_exceptions) Optimization
1437 Support synchronous non-call exceptions
1440 Common Report Var(flag_omit_frame_pointer) Optimization
1441 When possible do not generate stack frames
1443 foptimize-register-move
1444 Common Report Var(flag_regmove) Optimization
1445 Do the full register move optimization pass
1447 foptimize-sibling-calls
1448 Common Report Var(flag_optimize_sibling_calls) Optimization
1449 Optimize sibling and tail recursive calls
1452 Common Report Var(flag_partial_inlining)
1453 Perform partial inlining
1456 Common Report Var(pre_ipa_mem_report)
1457 Report on memory allocation before interprocedural optimization
1459 fpost-ipa-mem-report
1460 Common Report Var(post_ipa_mem_report)
1461 Report on memory allocation before interprocedural optimization
1464 Common Report Var(flag_pack_struct) Optimization
1465 Pack structure members together without holes
1468 Common RejectNegative Joined UInteger Optimization
1469 -fpack-struct=<number> Set initial maximum structure member alignment
1472 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1473 Return small aggregates in memory, not registers
1476 Common Report Var(flag_peel_loops) Optimization
1477 Perform loop peeling
1480 Common Report Var(flag_no_peephole,0) Optimization
1481 Enable machine specific peephole optimizations
1484 Common Report Var(flag_peephole2) Optimization
1485 Enable an RTL peephole pass before sched2
1488 Common Report Var(flag_pic,2)
1489 Generate position-independent code if possible (large mode)
1492 Common Report Var(flag_pie,2)
1493 Generate position-independent code for executables if possible (large mode)
1496 Common Report Var(flag_pic,1)
1497 Generate position-independent code if possible (small mode)
1500 Common Report Var(flag_pie,1)
1501 Generate position-independent code for executables if possible (small mode)
1504 Common Joined RejectNegative Var(common_deferred_options) Defer
1505 Specify a plugin to load
1508 Common Joined RejectNegative Var(common_deferred_options) Defer
1509 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1511 fpredictive-commoning
1512 Common Report Var(flag_predictive_commoning) Optimization
1513 Run predictive commoning optimization.
1515 fprefetch-loop-arrays
1516 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1517 Generate prefetch instructions, if available, for arrays in loops
1520 Common Report Var(profile_flag)
1521 Enable basic program profiling code
1524 Common Report Var(profile_arc_flag)
1525 Insert arc-based program profiling code
1528 Common Joined RejectNegative Var(profile_data_prefix)
1529 Set the top-level directory for storing the profile data.
1530 The default is 'pwd'.
1533 Common Report Var(flag_profile_correction)
1534 Enable correction of flow inconsistent profile data input
1538 Enable common options for generating profile info for profile feedback directed optimizations
1541 Common Joined RejectNegative
1542 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1545 Common Var(flag_profile_use)
1546 Enable common options for performing profile feedback directed optimizations
1549 Common Joined RejectNegative
1550 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1553 Common Report Var(flag_profile_values)
1554 Insert code to profile values of expressions
1557 Common Var(common_deferred_options) Defer
1560 Common Joined RejectNegative Var(common_deferred_options) Defer
1561 -frandom-seed=<string> Make compile reproducible using <string>
1563 ; This switch causes the command line that was used to create an
1564 ; object file to be recorded into the object file. The exact format
1565 ; of this recording is target and binary file format dependent.
1566 ; It is related to the -fverbose-asm switch, but that switch only
1567 ; records information in the assembler output file as comments, so
1568 ; they never reach the object file.
1569 frecord-gcc-switches
1570 Common Report Var(flag_record_gcc_switches)
1571 Record gcc command line switches in the object file.
1574 Common Report Var(flag_pcc_struct_return,0) Optimization
1575 Return small aggregates in registers
1578 Common Report Var(flag_regmove) Optimization
1579 Enables a register move optimization
1582 Common Report Var(flag_rename_registers) Init(2) Optimization
1583 Perform a register renaming optimization pass
1586 Common Report Var(flag_reorder_blocks) Optimization
1587 Reorder basic blocks to improve code placement
1589 freorder-blocks-and-partition
1590 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1591 Reorder basic blocks and partition into hot and cold sections
1594 Common Report Var(flag_reorder_functions) Optimization
1595 Reorder functions to improve code placement
1597 frerun-cse-after-loop
1598 Common Report Var(flag_rerun_cse_after_loop) Optimization
1599 Add a common subexpression elimination pass after loop optimizations
1603 Does nothing. Preserved for backward compatibility.
1606 Common Report Var(flag_rounding_math) Optimization SetByCombined
1607 Disable optimizations that assume default FP rounding behavior
1610 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1611 Enable scheduling across basic blocks
1614 Common Report Var(flag_sched_pressure) Init(0) Optimization
1615 Enable register pressure sensitive insn scheduling
1618 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1619 Allow speculative motion of non-loads
1622 Common Report Var(flag_schedule_speculative_load) Optimization
1623 Allow speculative motion of some loads
1625 fsched-spec-load-dangerous
1626 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1627 Allow speculative motion of more loads
1630 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1631 -fsched-verbose=<number> Set the verbosity level of the scheduler
1633 fsched2-use-superblocks
1634 Common Report Var(flag_sched2_use_superblocks) Optimization
1635 If scheduling post reload, do superblock scheduling
1639 Does nothing. Preserved for backward compatibility.
1642 Common Report Var(flag_schedule_insns) Optimization
1643 Reschedule instructions before register allocation
1646 Common Report Var(flag_schedule_insns_after_reload) Optimization
1647 Reschedule instructions after register allocation
1649 ; This flag should be on when a target implements non-trivial
1650 ; scheduling hooks, maybe saving some information for its own sake.
1651 ; On IA64, for example, this is used for correct bundling.
1652 fselective-scheduling
1653 Common Report Var(flag_selective_scheduling) Optimization
1654 Schedule instructions using selective scheduling algorithm
1656 fselective-scheduling2
1657 Common Report Var(flag_selective_scheduling2) Optimization
1658 Run selective scheduling after reload
1660 fsel-sched-pipelining
1661 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1662 Perform software pipelining of inner loops during selective scheduling
1664 fsel-sched-pipelining-outer-loops
1665 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1666 Perform software pipelining of outer loops during selective scheduling
1668 fsel-sched-reschedule-pipelined
1669 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1670 Reschedule pipelined regions without pipelining
1672 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1673 ; of stalled insns into the ready list.
1674 fsched-stalled-insns
1675 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1676 Allow premature scheduling of queued insns
1678 fsched-stalled-insns=
1679 Common RejectNegative Joined UInteger
1680 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1682 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1683 ; be examined for a dependency on a stalled insn that is candidate for
1684 ; premature removal from the queue of stalled insns into the ready list (has
1685 ; an effect only if the flag 'sched_stalled_insns' is set).
1686 fsched-stalled-insns-dep
1687 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1688 Set dependence distance checking in premature scheduling of queued insns
1690 fsched-stalled-insns-dep=
1691 Common RejectNegative Joined UInteger
1692 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1694 fsched-group-heuristic
1695 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1696 Enable the group heuristic in the scheduler
1698 fsched-critical-path-heuristic
1699 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1700 Enable the critical path heuristic in the scheduler
1702 fsched-spec-insn-heuristic
1703 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1704 Enable the speculative instruction heuristic in the scheduler
1706 fsched-rank-heuristic
1707 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1708 Enable the rank heuristic in the scheduler
1710 fsched-last-insn-heuristic
1711 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1712 Enable the last instruction heuristic in the scheduler
1714 fsched-dep-count-heuristic
1715 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1716 Enable the dependent count heuristic in the scheduler
1719 Common Report Var(flag_section_anchors) Optimization
1720 Access data in the same section from shared anchor points
1724 Does nothing. Preserved for backward compatibility.
1727 Common Report Var(flag_zee) Init(0)
1728 Eliminate redundant zero extensions on targets that support implicit extensions.
1731 Common Report Var(flag_show_column) Init(1)
1732 Show column numbers in diagnostics, when available. Default on
1735 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1736 Disable optimizations observable by IEEE signaling NaNs
1739 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1740 Disable floating point optimizations that ignore the IEEE signedness of zero
1742 fsingle-precision-constant
1743 Common Report Var(flag_single_precision_constant) Optimization
1744 Convert floating point constants to single precision constants
1746 fsplit-ivs-in-unroller
1747 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1748 Split lifetimes of induction variables when loops are unrolled
1751 Common Report Var(flag_split_stack) Init(-1)
1752 Generate discontiguous stack frames
1755 Common Report Var(flag_split_wide_types) Optimization
1756 Split wide types into independent registers
1758 fvariable-expansion-in-unroller
1759 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1760 Apply variable expansion when loops are unrolled
1763 Common Report RejectNegative Joined
1764 -fstack-check=[no|generic|specific] Insert stack checking code into the program
1767 Common Alias(fstack-check=, specific, no)
1768 Insert stack checking code into the program. Same as -fstack-check=specific
1771 Common Var(common_deferred_options) Defer
1773 fstack-limit-register=
1774 Common RejectNegative Joined Var(common_deferred_options) Defer
1775 -fstack-limit-register=<register> Trap if the stack goes past <register>
1777 fstack-limit-symbol=
1778 Common RejectNegative Joined Var(common_deferred_options) Defer
1779 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
1782 Common Report Var(flag_stack_protect, 1)
1783 Use propolice as a stack protection method
1785 fstack-protector-all
1786 Common Report RejectNegative Var(flag_stack_protect, 2)
1787 Use a stack protection method for every function
1790 Common RejectNegative Var(flag_stack_usage)
1791 Output stack usage information on a per-function basis
1795 Does nothing. Preserved for backward compatibility.
1797 ; Nonzero if we should do (language-dependent) alias analysis.
1798 ; Typically, this analysis will assume that expressions of certain
1799 ; types do not alias expressions of certain other types. Only used
1800 ; if alias analysis (in general) is enabled.
1802 Common Report Var(flag_strict_aliasing) Optimization
1803 Assume strict aliasing rules apply
1806 Common Report Var(flag_strict_overflow)
1807 Treat signed overflow as undefined
1810 Common Report Var(flag_syntax_only)
1811 Check for syntax errors, then stop
1814 Common Report Var(flag_test_coverage)
1815 Create data files needed by \"gcov\"
1818 Common Report Var(flag_thread_jumps) Optimization
1819 Perform jump threading optimizations
1822 Common Report Var(time_report)
1823 Report the time taken by each compiler pass
1826 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
1827 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
1830 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
1833 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
1836 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
1839 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
1842 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
1845 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
1846 Reorder top level functions, variables, and asms
1849 Common Report Var(flag_tracer)
1850 Perform superblock formation via tail duplication
1852 ; Zero means that floating-point math operations cannot generate a
1853 ; (user-visible) trap. This is the case, for example, in nonstop
1854 ; IEEE 754 arithmetic.
1856 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
1857 Assume floating-point operations can trap
1860 Common Report Var(flag_trapv) Optimization
1861 Trap for signed overflow in addition, subtraction and multiplication
1864 Common Report Var(flag_tree_ccp) Optimization
1865 Enable SSA-CCP optimization on trees
1868 Common Report Var(flag_tree_bit_ccp) Optimization
1869 Enable SSA-BIT-CCP optimization on trees
1873 Does nothing. Preserved for backward compatibility.
1876 Common Report Var(flag_tree_ch) Optimization
1877 Enable loop header copying on trees
1880 Common Report Var(flag_tree_copyrename) Optimization
1881 Replace SSA temporaries with better names in copies
1884 Common Report Var(flag_tree_copy_prop) Optimization
1885 Enable copy propagation on trees
1887 ftree-store-copy-prop
1889 Does nothing. Preserved for backward compatibility.
1892 Common Report Var(flag_tree_cselim) Init(2) Optimization
1893 Transform condition stores into unconditional ones
1895 ftree-switch-conversion
1896 Common Report Var(flag_tree_switch_conversion) Optimization
1897 Perform conversions of switch initializations.
1900 Common Report Var(flag_tree_dce) Optimization
1901 Enable SSA dead code elimination optimization on trees
1903 ftree-dominator-opts
1904 Common Report Var(flag_tree_dom) Optimization
1905 Enable dominator optimizations
1908 Common Report Var(flag_tree_dse) Optimization
1909 Enable dead store elimination
1912 Common Report Var(flag_tree_forwprop) Init(1) Optimization
1913 Enable forward propagation on trees
1916 Common Report Var(flag_tree_fre) Optimization
1917 Enable Full Redundancy Elimination (FRE) on trees
1919 ftree-loop-distribution
1920 Common Report Var(flag_tree_loop_distribution) Optimization
1921 Enable loop distribution on trees
1923 ftree-loop-distribute-patterns
1924 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
1925 Enable loop distribution for patterns transformed into a library call
1928 Common Report Var(flag_tree_loop_im) Init(1) Optimization
1929 Enable loop invariant motion on trees
1932 Common Alias(floop-interchange)
1933 Enable loop interchange transforms. Same as -floop-interchange
1936 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
1937 Create canonical induction variables in loops
1940 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
1941 Enable loop optimizations on tree level
1943 ftree-parallelize-loops=
1944 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
1945 Enable automatic parallelization of loops
1948 Common Report Var(flag_tree_phiprop) Init(1) Optimization
1949 Enable hoisting loads from conditional pointers.
1952 Common Report Var(flag_tree_pre) Optimization
1953 Enable SSA-PRE optimization on trees
1956 Common Report Var(flag_tree_pta) Init(1) Optimization
1957 Perform function-local points-to analysis on trees.
1960 Common Report Var(flag_tree_reassoc) Init(1) Optimization
1961 Enable reassociation on tree level
1965 Does nothing. Preserved for backward compatibility.
1968 Common Report Var(flag_tree_sink) Optimization
1969 Enable SSA code sinking on trees
1972 Common Report Var(flag_tree_sra) Optimization
1973 Perform scalar replacement of aggregates
1976 Common Report Var(flag_tree_ter) Optimization
1977 Replace temporary expressions in the SSA->normal pass
1980 Common Report Var(flag_tree_live_range_split) Optimization
1981 Perform live range splitting during the SSA->normal pass
1984 Common Report Var(flag_tree_vrp) Init(0) Optimization
1985 Perform Value Range Propagation on trees
1988 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
1989 Compile whole compilation unit at a time
1992 Common Report Var(flag_unroll_loops) Optimization
1993 Perform loop unrolling when iteration count is known
1996 Common Report Var(flag_unroll_all_loops) Optimization
1997 Perform loop unrolling for all loops
1999 ; Nonzero means that loop optimizer may assume that the induction variables
2000 ; that control loops do not overflow and that the loops with nontrivial
2001 ; exit condition are not infinite
2002 funsafe-loop-optimizations
2003 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2004 Allow loop optimizations to assume that the loops behave in normal way
2007 Common Report Var(flag_associative_math) SetByCombined
2008 Allow optimization for floating-point arithmetic which may change the
2009 result of the operation due to rounding.
2012 Common Report Var(flag_reciprocal_math) SetByCombined
2013 Same as -fassociative-math for expressions which include division.
2015 ; Nonzero means that unsafe floating-point math optimizations are allowed
2016 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2017 ; are allowed to assume that their arguments and results are "normal"
2018 ; (e.g., nonnegative for SQRT).
2019 funsafe-math-optimizations
2020 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2021 Allow math optimizations that may violate IEEE or ISO standards
2024 Common Report Var(flag_unswitch_loops) Optimization
2025 Perform loop unswitching
2028 Common Report Var(flag_unwind_tables) Optimization
2029 Just generate unwind tables for exception handling
2034 ; Positive if we should track variables, negative if we should run
2035 ; the var-tracking pass only to discard debug annotations, zero if
2036 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2037 ; will be set according to optimize, debug_info_level and debug_hooks
2038 ; in process_options ().
2040 Common Report Var(flag_var_tracking) Init(2) Optimization
2041 Perform variable tracking
2043 ; Positive if we should track variables at assignments, negative if
2044 ; we should run the var-tracking pass only to discard debug
2045 ; annotations. When flag_var_tracking_assignments ==
2046 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2047 fvar-tracking-assignments
2048 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2049 Perform variable tracking by annotating assignments
2051 ; Nonzero if we should toggle flag_var_tracking_assignments after
2052 ; processing options and computing its default. */
2053 fvar-tracking-assignments-toggle
2054 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2055 Toggle -fvar-tracking-assignments
2057 fvar-tracking-uninit
2058 Common Report Var(flag_var_tracking_uninit) Optimization
2059 Perform variable tracking and also tag variables that are uninitialized
2062 Common Report Var(flag_tree_vectorize) Optimization
2063 Enable loop vectorization on trees
2066 Common Report Var(flag_tree_slp_vectorize) Init(2) Optimization
2067 Enable basic block vectorization (SLP) on trees
2070 Common Report Var(flag_vect_cost_model) Optimization
2071 Enable use of cost model in vectorization
2073 ftree-vect-loop-version
2074 Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization
2075 Enable loop versioning when doing loop vectorization on trees
2077 ftree-vectorizer-verbose=
2078 Common RejectNegative Joined UInteger
2079 -ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
2082 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2083 Enable copy propagation of scalar-evolution information.
2085 ; -fverbose-asm causes extra commentary information to be produced in
2086 ; the generated assembly code (to make it more readable). This option
2087 ; is generally only of use to those who actually need to read the
2088 ; generated assembly code (perhaps while debugging the compiler itself).
2089 ; -fno-verbose-asm, the default, causes the extra information
2090 ; to not be added and is useful when comparing two assembler files.
2092 Common Report Var(flag_verbose_asm)
2093 Add extra commentary to assembler output
2096 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2097 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2100 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2103 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2106 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2109 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2112 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2115 Common Report Var(flag_value_profile_transformations) Optimization
2116 Use expression value profiles in optimizations
2119 Common Report Var(flag_web) Init(2) Optimization
2120 Construct webs and split unrelated uses of single variable
2122 ftree-builtin-call-dce
2123 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2124 Enable conditional dead code elimination for builtin calls
2127 Common Report Var(flag_whole_program) Init(0) Optimization
2128 Perform whole program optimizations
2131 Common Report Var(flag_wrapv) Optimization
2132 Assume signed arithmetic overflow wraps around
2134 fzero-initialized-in-bss
2135 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2136 Put zero initialized data in the bss section
2139 Common JoinedOrMissing
2140 Generate debug information in default format
2143 Common JoinedOrMissing Negative(gdwarf-)
2144 Generate debug information in COFF format
2147 Common Joined UInteger Var(dwarf_version) Init(2) Negative(gstabs)
2148 Generate debug information in DWARF v2 (or later) format
2151 Common JoinedOrMissing
2152 Generate debug information in default extended format
2155 Common JoinedOrMissing Negative(gstabs+)
2156 Generate debug information in STABS format
2159 Common JoinedOrMissing Negative(gvms)
2160 Generate debug information in extended STABS format
2163 Common RejectNegative Var(dwarf_strict,0) Init(-1)
2164 Emit DWARF additions beyond selected version
2167 Common Report RejectNegative Var(dwarf_strict,1)
2168 Don't emit DWARF additions beyond selected version
2171 Common Report Var(flag_gtoggle)
2172 Toggle debug information generation
2175 Common JoinedOrMissing Negative(gxcoff)
2176 Generate debug information in VMS format
2179 Common JoinedOrMissing Negative(gxcoff+)
2180 Generate debug information in XCOFF format
2183 Common JoinedOrMissing Negative(gcoff)
2184 Generate debug information in extended XCOFF format
2187 Driver Joined Separate
2190 Common Joined Var(plugindir_string) Init(0)
2191 -iplugindir=<dir> Set <dir> to be the default plugin directory
2194 Driver Joined Separate
2199 no-canonical-prefixes
2212 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2213 -o <file> Place output into <file>
2216 Common Var(profile_flag)
2217 Enable function profiling
2220 Driver Var(pass_exit_codes)
2223 Common Var(pedantic)
2224 Issue warnings needed for strict compliance to the standard
2227 Common Var(flag_pedantic_errors)
2228 Like -pedantic but issue them as errors
2234 Driver Var(use_pipes)
2237 Driver JoinedOrMissing Var(print_file_name)
2239 print-libgcc-file-name
2242 print-multi-directory
2243 Driver Var(print_multi_directory)
2246 Driver Var(print_multi_lib)
2248 print-multi-os-directory
2249 Driver Var(print_multi_os_directory)
2252 Driver JoinedOrMissing Var(print_prog_name)
2255 Driver Var(print_search_dirs)
2258 Driver Var(print_sysroot)
2260 print-sysroot-headers-suffix
2261 Driver Var(print_sysroot_headers_suffix)
2264 Common Var(quiet_flag) RejectDriver
2265 Do not display functions compiled or elapsed time
2283 Driver Var(report_times)
2286 Driver JoinedOrMissing
2289 Driver Joined Separate
2293 ; C option, but driver must not handle as "-u ndef".
2296 Common Driver Var(verbose_flag)
2297 Enable verbose output
2300 Common Var(version_flag) RejectDriver
2301 Display the compiler's version
2304 Common Var(inhibit_warnings)
2308 Driver Separate Var(wrapper_string)
2311 Driver Joined Separate
2314 Common RejectNegative Negative(pie)
2315 Create a shared library
2321 Driver Separate Alias(specs=)
2334 ; Documented for Fortran, but always accepted by driver.
2341 ; Documented for Go, but always accepted by driver.
2347 Common RejectNegative Negative(shared)
2348 Create a position independent executable
2351 Driver Joined Separate
2353 ; This comment is to ensure we retain the blank line above.