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 ; 0 means straightforward implementation of complex divide acceptable.
36 ; 1 means wide ranges of inputs must work for complex divide.
37 ; 2 means C99-like requirements for complex multiply and divide.
39 int flag_complex_method = 1
41 ; Nonzero if subexpressions must be evaluated from left-to-right.
43 int flag_evaluation_order = 0
45 ; Language specific warning pass for unused results.
47 bool flag_warn_unused_result = false
52 ; Nonzero if we should write GIMPLE bytecode for link-time optimization.
56 ; True to warn about any objects definitions whose size is larger
57 ; than N bytes. Also want about function definitions whose returned
58 ; values are larger than N bytes, where N is 'larger_than_size'.
63 HOST_WIDE_INT larger_than_size
65 ; True to warn about any function whose frame size is larger
68 bool warn_frame_larger_than
71 HOST_WIDE_INT frame_larger_than_size
73 ; Nonzero means we should be saving declaration info into a .X file.
75 int flag_gen_aux_info = 0
77 ; Nonzero if we are compiling code for a shared library, zero for
82 ; These two are really VEC(char_p,heap) *.
85 void *flag_instrument_functions_exclude_functions
88 void *flag_instrument_functions_exclude_files
90 ; Generic structs (e.g. templates not explicitly specialized)
91 ; may not have a compilation unit associated with them, and so
92 ; may need to be treated differently from ordinary structs.
94 ; Structs only handled by reference (indirectly), will also usually
95 ; not need as much debugging information.
98 enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
101 enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
103 ; True if we should exit after parsing options.
105 bool exit_after_options
107 ; Type(s) of debugging information we are producing (if any). See
108 ; flag-types.h for the definitions of the different possible types of
109 ; debugging information.
111 enum debug_info_type write_symbols = NO_DEBUG
113 ; Level of debugging information we are producing. See flag-types.h
114 ; for the definitions of the different possible levels.
116 enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
118 ; Nonzero means use GNU-only extensions in the generated symbolic
119 ; debugging information. Currently, this only has an effect when
120 ; write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG.
122 bool use_gnu_debug_info_extensions
124 ; Original value of maximum field alignment in bytes, specified via
125 ; -fpack-struct=<value>.
127 unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
130 enum vect_verbosity_levels user_vect_verbosity_level = MAX_VERBOSITY_LEVEL
132 ; Type of stack check.
134 enum stack_check_type flag_stack_check = NO_STACK_CHECK
136 ; -dA causes debug commentary information to be produced in
137 ; the generated assembly code (to make it more readable). This option
138 ; is generally only of use to those who actually need to read the
139 ; generated assembly code (perhaps while debugging the compiler itself).
140 ; Currently, this switch is only used by dwarf2out.c; however, it is intended
141 ; to be a catchall for printing debug information in the assembler file.
145 ; -dP causes the rtl to be emitted as a comment in assembly.
147 int flag_dump_rtl_in_asm
149 ; Whether -da was passed (used only in handle_common_deferred_options).
151 bool flag_dump_all_passed
153 ; Other flags saying which kinds of debugging dump have been requested.
156 int rtl_dump_and_exit
159 int flag_print_asm_name
162 enum graph_dump_types graph_dump_format = no_graph
164 ; Name of top-level original source file (what was input to cpp).
165 ; This comes from the #-command at the beginning of the actual input.
166 ; If there isn't any there, then this is the cc1 input file name.
168 const char *main_input_filename
170 ; Pointer to base name in main_input_filename, with directories and a
171 ; single final extension removed, and the length of this base
175 const char *main_input_basename
178 int main_input_baselength
180 ; Which options have been printed by --help.
184 ; Which enums have been printed by --help. 0 = not printed, no
185 ; relevant options seen, 1 = relevant option seen, not yet printed, 2
188 char *help_enum_printed
190 ; The number of columns for --help output.
192 unsigned int help_columns
194 ; Whether this options structure has been through finish_options
196 bool flag_opts_finished
208 Driver Alias(coverage)
214 Common Separate Alias(d)
217 Common Joined Alias(d)
220 Common Separate Alias(dumpbase)
223 Common Separate Alias(dumpdir)
226 Driver Separate Alias(e)
229 Driver Joined Alias(e)
232 Common Warning Alias(Wextra)
235 Driver Separate Alias(Xassembler)
238 Driver JoinedOrMissing Alias(Xassembler)
241 Driver Separate Alias(Xlinker)
244 Driver JoinedOrMissing Alias(Xlinker)
247 Driver Separate Alias(u)
250 Driver Joined Alias(u)
253 Common Driver Var(help_flag)
254 Display this information
257 Common Driver Report Joined
258 --help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params
261 Driver Separate Alias(x)
264 Driver Joined Alias(x)
267 Driver Separate Alias(L)
270 Driver Joined Alias(L)
272 -no-canonical-prefixes
273 Driver Alias(no-canonical-prefixes)
275 -no-standard-libraries
276 Driver Alias(nostdlib)
285 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
288 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
291 Driver Alias(pass-exit-codes)
294 Common Alias(pedantic)
297 Common Alias(pedantic-errors)
306 Driver Separate Alias(B)
309 Driver JoinedOrMissing Alias(B)
315 Driver Separate Alias(print-file-name=)
318 Driver JoinedOrMissing Alias(print-file-name=)
320 -print-libgcc-file-name
321 Driver Alias(print-libgcc-file-name)
323 -print-multi-directory
324 Driver Alias(print-multi-directory)
327 Driver Alias(print-multi-lib)
329 -print-multi-os-directory
330 Driver Alias(print-multi-os-directory)
333 Driver Separate Alias(print-prog-name=)
336 Driver JoinedOrMissing Alias(print-prog-name=)
339 Driver Alias(print-search-dirs)
342 Driver Alias(print-sysroot)
344 -print-sysroot-headers-suffix
345 Driver Alias(print-sysroot-headers-suffix)
351 Driver Alias(save-temps)
357 Driver Separate Alias(specs=)
360 Driver Joined Alias(specs=)
366 Driver Alias(symbolic)
370 Alias for --help=target
378 ;; The driver used to convert options such as --help into forms such
379 ;; as -fhelp; the following four entries are for compatibility with
380 ;; any direct uses of those (undocumented) -f forms
382 Common Driver Alias(-help)
385 Common Driver Joined Alias(-help=)
388 Common Driver Alias(-target-help)
391 Common Driver Alias(-version)
395 --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
398 Common Joined Alias(-param)
401 Driver Separate Alias(-sysroot=)
404 Driver JoinedOrMissing
410 Driver Joined Separate
416 Driver Joined Separate
422 Common JoinedOrMissing Optimization
423 -O<number> Set optimization level to <number>
427 Optimize for space rather than speed
431 Optimize for speed disregarding exact standards compliance
443 Driver Joined Separate
449 Driver Joined Separate
461 Common RejectNegative Warning Alias(Wextra)
462 This switch is deprecated; use -Wextra instead
465 Driver JoinedOrMissing
468 Driver JoinedOrMissing
471 Driver JoinedOrMissing
474 Common Var(warn_aggregate_return) Warning
475 Warn about returning structures, unions or arrays
478 Common Var(warn_array_bounds) Warning
479 Warn if an array is accessed out of bounds
482 Common Var(warn_attributes) Init(1) Warning
483 Warn about inappropriate attribute usage
486 Common Var(warn_cast_align) Warning
487 Warn about pointer casts which increase alignment
490 Common Var(warn_cpp) Init(1) Warning
491 Warn when a #warning directive is encountered
493 Wdeprecated-declarations
494 Common Var(warn_deprecated_decl) Init(1) Warning
495 Warn about uses of __attribute__((deprecated)) declarations
497 Wdisabled-optimization
498 Common Var(warn_disabled_optimization) Warning
499 Warn when an optimization pass is disabled
502 Common Var(warnings_are_errors)
503 Treat all warnings as errors
507 Treat specified warning as error
510 Common Var(extra_warnings) Warning
511 Print extra (possibly unwanted) warnings
514 Common Var(flag_fatal_errors)
515 Exit on the first error occurred
518 Common RejectNegative Joined UInteger
519 -Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
522 Common Var(warn_inline) Warning
523 Warn when an inlined function cannot be inlined
526 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
529 Common RejectNegative Joined UInteger Warning
530 -Wlarger-than=<number> Warn if an object is larger than <number> bytes
532 Wunsafe-loop-optimizations
533 Common Var(warn_unsafe_loop_optimizations) Warning
534 Warn if the loop cannot be optimized due to nontrivial assumptions.
537 Common Var(warn_missing_noreturn) Warning
538 Warn about functions which might be candidates for __attribute__((noreturn))
541 Common Var(warn_mudflap) Init(1) Warning
542 Warn about constructs not instrumented by -fmudflap
545 Common Var(warn_overflow) Init(1) Warning
546 Warn about overflow in arithmetic expressions
549 Common Var(warn_packed) Warning
550 Warn when the packed attribute has no effect on struct layout
553 Common Var(warn_padded) Warning
554 Warn when padding is required to align structure members
557 Common Var(warn_shadow) Warning
558 Warn when one local variable shadows another
561 Common Var(warn_stack_protect) Warning
562 Warn when not issuing stack smashing protection for some reason
566 Warn about code which might break strict aliasing rules
569 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Init(-1) Warning
570 Warn about code which might break strict aliasing rules
574 Warn about optimizations that assume that signed overflow is undefined
577 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Init(-1) Warning
578 Warn about optimizations that assume that signed overflow is undefined
580 Wsuggest-attribute=const
581 Common Var(warn_suggest_attribute_const) Warning
582 Warn about functions which might be candidates for __attribute__((const))
584 Wsuggest-attribute=pure
585 Common Var(warn_suggest_attribute_pure) Warning
586 Warn about functions which might be candidates for __attribute__((pure))
588 Wsuggest-attribute=noreturn
589 Common Var(warn_suggest_attribute_noreturn) Warning
590 Warn about functions which might be candidates for __attribute__((noreturn))
593 Common Var(warn_switch) Warning
594 Warn about enumerated switches, with no default, missing a case
597 Common Var(warn_switch_default) Warning
598 Warn about enumerated switches missing a \"default:\" statement
601 Common Var(warn_switch_enum) Warning
602 Warn about all enumerated switches missing a specific case
605 Common Var(warn_system_headers) Warning
606 Do not suppress warnings from system headers
609 Common Var(warn_trampolines) Warning
610 Warn whenever a trampoline is generated
613 Common Var(warn_type_limits) Init(-1) Warning
614 Warn if a comparison is always true or always false due to the limited range of the data type
617 Common Var(warn_uninitialized) Init(-1) Warning
618 Warn about uninitialized automatic variables
622 Does nothing. Preserved for backward compatibility.
625 Common Var(warn_unused) Init(0) Warning
626 Enable all -Wunused- warnings
628 Wunused-but-set-parameter
629 Common Var(warn_unused_but_set_parameter) Init(-1) Warning
630 Warn when a function parameter is only set, otherwise unused
632 Wunused-but-set-variable
633 Common Var(warn_unused_but_set_variable) Init(-1) Warning
634 Warn when a variable is only set, otherwise unused
637 Common Var(warn_unused_function) Init(-1) Warning
638 Warn when a function is unused
641 Common Var(warn_unused_label) Init(-1) Warning
642 Warn when a label is unused
645 Common Var(warn_unused_parameter) Init(-1) Warning
646 Warn when a function parameter is unused
649 Common Var(warn_unused_value) Init(-1) Warning
650 Warn when an expression value is unused
653 Common Var(warn_unused_variable) Init(-1) Warning
654 Warn when a variable is unused
657 Common Var(warn_coverage_mismatch) Init(1) Warning
658 Warn in case profiles in -fprofile-use do not match
673 Common Separate Var(aux_info_file_name)
674 -aux-info <file> Emit declaration information into <file>
677 Common Joined Alias(aux-info)
680 Common Separate RejectDriver Var(aux_base_name)
683 Common Separate RejectDriver
693 -d<letters> Enable dumps from specific passes of the compiler
696 Common Separate Var(dump_base_name)
697 -dumpbase <file> Set the file basename to be used for dumps
700 Common Separate Var(dump_dir_name)
701 -dumpdir <dir> Set the directory name to be used for dumps
713 Driver Joined Separate
715 ; The version of the C++ ABI in use. The following values are allowed:
717 ; 0: The version of the ABI believed most conformant with the C++ ABI
718 ; specification. This ABI may change as bugs are discovered and fixed.
719 ; Therefore, 0 will not necessarily indicate the same ABI in different
722 ; 1: The version of the ABI first used in G++ 3.2.
724 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
726 ; 3: The version of the ABI that fixes the missing underscore
727 ; in template non-type arguments of pointer type.
729 ; 4: The version of the ABI that introduces unambiguous mangling of
732 ; Additional positive integers will be assigned as new versions of
733 ; the ABI become the default version of the ABI.
735 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(2)
738 Common Report Var(align_functions,0) Optimization UInteger
739 Align the start of functions
742 Common RejectNegative Joined UInteger Var(align_functions)
745 Common Report Var(align_jumps,0) Optimization UInteger
746 Align labels which are only reached by jumping
749 Common RejectNegative Joined UInteger Var(align_jumps)
752 Common Report Var(align_labels,0) Optimization UInteger
756 Common RejectNegative Joined UInteger Var(align_labels)
759 Common Report Var(align_loops,0) Optimization UInteger
760 Align the start of loops
763 Common RejectNegative Joined UInteger Var(align_loops)
767 Does nothing. Preserved for backward compatibility.
771 Does nothing. Preserved for backward compatibility.
773 fargument-noalias-global
775 Does nothing. Preserved for backward compatibility.
777 fargument-noalias-anything
779 Does nothing. Preserved for backward compatibility.
781 fasynchronous-unwind-tables
782 Common Report Var(flag_asynchronous_unwind_tables) Optimization
783 Generate unwind tables that are exact at each instruction boundary
786 Common Report Var(flag_auto_inc_dec) Init(1)
787 Generate auto-inc/dec instructions
789 ; -fcheck-bounds causes gcc to generate array bounds checks.
790 ; For C, C++ and ObjC: defaults off.
791 ; For Java: defaults to on.
792 ; For Fortran: defaults to off.
794 Common Report Var(flag_bounds_check)
795 Generate code to check bounds before indexing arrays
798 Common Report Var(flag_branch_on_count_reg) Init(1) Optimization
799 Replace add, compare, branch with branch on count register
801 fbranch-probabilities
802 Common Report Var(flag_branch_probabilities) Optimization
803 Use profiling information for branch probabilities
805 fbranch-target-load-optimize
806 Common Report Var(flag_branch_target_load_optimize) Optimization
807 Perform branch target load optimization before prologue / epilogue threading
809 fbranch-target-load-optimize2
810 Common Report Var(flag_branch_target_load_optimize2) Optimization
811 Perform branch target load optimization after prologue / epilogue threading
814 Common Report Var(flag_btr_bb_exclusive) Optimization
815 Restrict target load migration not to re-use registers in any basic block
818 Common Joined RejectNegative Var(common_deferred_options) Defer
819 -fcall-saved-<register> Mark <register> as being preserved across functions
822 Common Joined RejectNegative Var(common_deferred_options) Defer
823 -fcall-used-<register> Mark <register> as being corrupted by function calls
825 ; Nonzero for -fcaller-saves: allocate values in regs that need to
826 ; be saved across function calls, if that produces overall better code.
827 ; Optional now, so people can test it.
829 Common Report Var(flag_caller_saves) Optimization
830 Save registers around function calls
833 Common Report Var(flag_check_data_deps)
834 Compare the results of several data dependence analyzers.
836 fcombine-stack-adjustments
837 Common Report Var(flag_combine_stack_adjustments) Optimization
838 Looks for opportunities to reduce stack adjustments and stack references.
841 Common Report Var(flag_no_common,0) Optimization
842 Do not put uninitialized globals in the common section
846 ; Converted by the driver to -fcompare-debug= options.
849 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
850 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
852 fcompare-debug-second
853 Common Driver RejectNegative Var(flag_compare_debug)
854 Run only the second compilation of -fcompare-debug
857 Common Report Var(flag_compare_elim_after_reload) Optimization
858 Perform comparison elimination after register allocation has finished
861 Common Var(flag_conserve_stack) Optimization
862 Do not perform optimizations increasing noticeably stack usage
865 Common Report Var(flag_cprop_registers) Optimization
866 Perform a register copy-propagation optimization pass
869 Common Report Var(flag_crossjumping) Optimization
870 Perform cross-jumping optimization
873 Common Report Var(flag_cse_follow_jumps) Optimization
874 When running CSE, follow jumps to their targets
878 Does nothing. Preserved for backward compatibility.
881 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
882 Omit range reduction step when performing complex division
885 Common Report Var(flag_cx_fortran_rules) Optimization
886 Complex multiplication and division follow Fortran rules
889 Common Report Var(flag_data_sections) Optimization
890 Place data items into their own section
893 Common Report Var(common_deferred_options) Defer
894 List all available debugging counters with their limits and counts.
897 Common RejectNegative Joined Var(common_deferred_options) Defer
898 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
901 Common Joined RejectNegative Var(common_deferred_options) Defer
902 Map one directory name to another in debug information
904 ; Nonzero for -fdefer-pop: don't pop args after each function call
905 ; instead save them up to pop many calls' args with one insns.
907 Common Report Var(flag_defer_pop) Optimization
908 Defer popping functions args from stack until later
911 Common Report Var(flag_delayed_branch) Optimization
912 Attempt to fill delay slots of branch instructions
914 fdelete-null-pointer-checks
915 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
916 Delete useless null pointer checks
919 Common Report Var(flag_devirtualize) Optimization
920 Try to convert virtual calls to direct ones.
922 fdiagnostics-show-location=
923 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
924 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
926 ; Required for these enum values.
931 Name(diagnostic_prefixing_rule) Type(int)
934 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
937 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
939 fdiagnostics-show-option
940 Common Var(flag_diagnostics_show_option) Init(1)
941 Amend appropriate diagnostic messages with the command line option that controls them
944 Common Joined RejectNegative Var(common_deferred_options) Defer
945 -fdump-<type> Dump various compiler internals to a file
948 Driver RejectNegative
951 Common RejectNegative Joined Var(flag_dump_final_insns)
952 -fdump-final-insns=filename Dump to filename the insns at the end of translation
955 Common RejectNegative Joined Var(flag_dump_go_spec)
956 -fdump-go-spec=filename Write all declarations to file as Go code
959 Common Report Var(flag_dump_noaddr)
960 Suppress output of addresses in debugging dumps
963 Common Report Var(flag_dump_unnumbered)
964 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
966 fdump-unnumbered-links
967 Common Report Var(flag_dump_unnumbered_links)
968 Suppress output of previous and next insn numbers in debugging dumps
971 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
972 Enable CFI tables via GAS assembler directives.
975 Common Report Var(flag_early_inlining) Init(1) Optimization
976 Perform early inlining
978 feliminate-dwarf2-dups
979 Common Report Var(flag_eliminate_dwarf2_dups)
980 Perform DWARF2 duplicate elimination
983 Common Report Var(flag_ipa_sra) Init(0) Optimization
984 Perform interprocedural reduction of aggregates
986 feliminate-unused-debug-symbols
987 Common Report Var(flag_debug_only_used_symbols)
988 Perform unused type elimination in debug info
990 feliminate-unused-debug-types
991 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
992 Perform unused type elimination in debug info
994 femit-class-debug-always
995 Common Report Var(flag_emit_class_debug_always) Init(0)
996 Do not suppress C++ class debug information.
999 Common Report Var(flag_enable_icf_debug)
1000 Generate debug information to support Identical Code Folding (ICF)
1003 Common Report Var(flag_exceptions) Optimization
1004 Enable exception handling
1006 fexpensive-optimizations
1007 Common Report Var(flag_expensive_optimizations) Optimization
1008 Perform a number of minor, expensive optimizations
1011 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1012 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1015 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1018 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1021 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1027 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1028 Assume no NaNs or infinities are generated
1031 Common Joined RejectNegative Var(common_deferred_options) Defer
1032 -ffixed-<register> Mark <register> as being unavailable to the compiler
1035 Common Report Var(flag_float_store) Optimization
1036 Don't allocate floats and doubles in extended-precision registers
1040 Does nothing. Preserved for backward compatibility.
1043 Common Report Var(flag_forward_propagate) Optimization
1044 Perform a forward propagation pass on RTL
1047 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1048 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1051 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1054 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1056 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1058 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1061 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1063 ; Nonzero means don't put addresses of constant functions in registers.
1064 ; Used for compiling the Unix kernel, where strange substitutions are
1065 ; done on the assembly output.
1067 Common Report Var(flag_no_function_cse,0)
1068 Allow function addresses to be held in registers
1071 Common Report Var(flag_function_sections)
1072 Place each function into its own section
1075 Common Report Var(flag_gcse) Optimization
1076 Perform global common subexpression elimination
1079 Common Report Var(flag_gcse_lm) Init(1) Optimization
1080 Perform enhanced load motion during global common subexpression elimination
1083 Common Report Var(flag_gcse_sm) Init(0) Optimization
1084 Perform store motion after global common subexpression elimination
1087 Common Report Var(flag_gcse_las) Init(0) Optimization
1088 Perform redundant load after store elimination in global common subexpression
1092 Common Report Var(flag_gcse_after_reload) Optimization
1093 Perform global common subexpression elimination after register allocation
1096 ; This option is not documented yet as its semantics will change.
1098 Common Report Var(flag_graphite)
1099 Enable in and out of Graphite representation
1102 Common Report Var(flag_graphite_identity) Optimization
1103 Enable Graphite Identity transformation
1105 floop-parallelize-all
1106 Common Report Var(flag_loop_parallelize_all) Optimization
1107 Mark all loops as parallel
1110 Common Report Var(flag_loop_strip_mine) Optimization
1111 Enable Loop Strip Mining transformation
1114 Common Report Var(flag_loop_interchange) Optimization
1115 Enable Loop Interchange transformation
1118 Common Report Var(flag_loop_block) Optimization
1119 Enable Loop Blocking transformation
1122 Common Report Var(flag_loop_flatten) Optimization
1123 Enable Loop Flattening transformation
1125 fstrict-volatile-bitfields
1126 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1127 Force bitfield accesses to match their type width
1129 fguess-branch-probability
1130 Common Report Var(flag_guess_branch_prob) Optimization
1131 Enable guessing of branch probabilities
1133 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1134 ; Generate position-independent code for executables if possible
1135 ; On SVR4 targets, it also controls whether or not to emit a
1136 ; string identifying the compiler.
1138 Common Report Var(flag_no_ident,0)
1139 Process #ident directives
1142 Common Report Var(flag_if_conversion) Optimization
1143 Perform conversion of conditional jumps to branchless equivalents
1146 Common Report Var(flag_if_conversion2) Optimization
1147 Perform conversion of conditional jumps to conditional execution
1149 ftree-loop-if-convert
1150 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1151 Convert conditional jumps in innermost loops to branchless equivalents
1153 ftree-loop-if-convert-stores
1154 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1155 Also if-convert conditional jumps containing memory writes
1157 ; -finhibit-size-directive inhibits output of .size for ELF.
1158 ; This is used only for compiling crtstuff.c,
1159 ; and it may be extended to other effects
1160 ; needed for crtstuff.c on other systems.
1161 finhibit-size-directive
1162 Common Report Var(flag_inhibit_size_directive)
1163 Do not generate .size directives
1166 Common Report Var(flag_indirect_inlining)
1167 Perform indirect inlining
1169 ; Nonzero means that functions declared `inline' will be treated
1170 ; as `static'. Prevents generation of zillions of copies of unused
1171 ; static inline functions; instead, `inlines' are written out
1172 ; only when actually used. Used in conjunction with -g. Also
1173 ; does the right thing with #pragma interface.
1175 Common Report Var(flag_no_inline,0) Init(0)
1176 Pay attention to the \"inline\" keyword
1178 finline-small-functions
1179 Common Report Var(flag_inline_small_functions) Optimization
1180 Integrate simple functions into their callers when code size is known to not growth
1183 Common Report Var(flag_inline_functions) Optimization
1184 Integrate simple functions into their callers
1186 finline-functions-called-once
1187 Common Report Var(flag_inline_functions_called_once) Init(1) Optimization
1188 Integrate functions called once into their callers
1191 Common RejectNegative Joined Alias(finline-limit=)
1194 Common RejectNegative Joined UInteger
1195 -finline-limit=<number> Limit the size of inlined functions to <number>
1197 finstrument-functions
1198 Common Report Var(flag_instrument_function_entry_exit)
1199 Instrument function entry and exit with profiling calls
1201 finstrument-functions-exclude-function-list=
1202 Common RejectNegative Joined
1203 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1205 finstrument-functions-exclude-file-list=
1206 Common RejectNegative Joined
1207 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1210 Common Report Var(flag_ipa_cp) Optimization
1211 Perform Interprocedural constant propagation
1214 Common Report Var(flag_ipa_cp_clone) Optimization
1215 Perform cloning to make Interprocedural constant propagation stronger
1218 Common Report Var(flag_ipa_profile) Init(0) Optimization
1219 Perform interprocedural profile propagation
1222 Common Report Var(flag_ipa_pta) Init(0) Optimization
1223 Perform interprocedural points-to analysis
1226 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1227 Discover pure and const functions
1230 Common Report Var(flag_ipa_reference) Init(0) Optimization
1231 Discover readonly and non addressable static variables
1234 Common Report Var(flag_ipa_matrix_reorg) Optimization
1235 Perform matrix layout flattening and transposing based
1236 on profiling information.
1239 Common Report Var(flag_ipa_struct_reorg)
1240 Perform structure layout optimizations based
1241 on profiling information.
1244 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1245 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1248 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1251 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1254 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1257 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_MIXED)
1258 -fira-region=[one|all|mixed] Set regions for IRA
1261 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1264 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1267 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1270 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1273 Common Report Var(flag_ira_loop_pressure)
1274 Use IRA based register pressure calculation
1275 in RTL loop optimizations.
1277 fira-share-save-slots
1278 Common Report Var(flag_ira_share_save_slots) Init(1)
1279 Share slots for saving different hard registers.
1281 fira-share-spill-slots
1282 Common Report Var(flag_ira_share_spill_slots) Init(1)
1283 Share stack slots for spilled pseudo-registers.
1286 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1287 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1290 Common Report Var(flag_ivopts) Init(1) Optimization
1291 Optimize induction variables on trees
1294 Common Var(flag_jump_tables) Init(1) Optimization
1295 Use jump tables for sufficiently large switch statements
1297 fkeep-inline-functions
1298 Common Report Var(flag_keep_inline_functions)
1299 Generate code for functions even if they are fully inlined
1302 Common Report Var(flag_keep_static_consts) Init(1)
1303 Emit static const variables even if they are not used
1306 Common Report Var(flag_leading_underscore) Init(-1)
1307 Give external symbols a leading underscore
1311 Does nothing. Preserved for backward compatibility.
1315 Enable link-time optimization.
1318 Common RejectNegative Joined Var(flag_lto)
1319 Link-time optimization with number of parallel jobs or jobserver.
1322 Common Var(flag_lto_partition_1to1)
1323 Partition functions and vars at linktime based on object files they originate from
1325 flto-partition=balanced
1326 Common Var(flag_lto_partition_balanced)
1327 Partition functions and vars at linktime into approximately same sized buckets
1330 Common Var(flag_lto_partition_none)
1331 Disable partioning and streaming
1333 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1334 flto-compression-level=
1335 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1336 -flto-compression-level=<number> Use zlib compression level <number> for IL
1339 Common Report Var(flag_lto_report) Init(0) Optimization
1340 Report various link-time optimization statistics
1343 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1344 Set errno after built-in math functions
1347 Common Joined RejectNegative UInteger Var(flag_max_errors)
1348 -fmax-errors=<number> Maximum number of errors to report
1351 Common Report Var(mem_report)
1352 Report on permanent memory allocation
1354 ; This will attempt to merge constant section constants, if 1 only
1355 ; string constants and constants from constant pool, if 2 also constant
1357 fmerge-all-constants
1358 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1359 Attempt to merge identical constants and constant variables
1362 Common Report Var(flag_merge_constants,1) Optimization
1363 Attempt to merge identical constants across compilation units
1365 fmerge-debug-strings
1366 Common Report Var(flag_merge_debug_strings) Init(1)
1367 Attempt to merge identical debug strings across compilation units
1370 Common RejectNegative Joined UInteger
1371 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1374 Common Report Var(flag_modulo_sched) Optimization
1375 Perform SMS based modulo scheduling before the first scheduling pass
1377 fmodulo-sched-allow-regmoves
1378 Common Report Var(flag_modulo_sched_allow_regmoves)
1379 Perform SMS based modulo scheduling with register moves allowed
1381 fmove-loop-invariants
1382 Common Report Var(flag_move_loop_invariants) Init(1) Optimization
1383 Move loop invariant computations out of loops
1386 Common RejectNegative Report Var(flag_mudflap)
1387 Add mudflap bounds-checking instrumentation for single-threaded program
1390 Common RejectNegative Report Var(flag_mudflap,2)
1391 Add mudflap bounds-checking instrumentation for multi-threaded program
1394 Common RejectNegative Report Var(flag_mudflap_ignore_reads)
1395 Ignore read operations when inserting mudflap instrumentation
1398 Common Var(flag_dce) Init(1) Optimization
1399 Use the RTL dead code elimination pass
1402 Common Var(flag_dse) Init(1) Optimization
1403 Use the RTL dead store elimination pass
1405 freschedule-modulo-scheduled-loops
1406 Common Report Var(flag_resched_modulo_sched) Optimization
1407 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1409 fnon-call-exceptions
1410 Common Report Var(flag_non_call_exceptions) Optimization
1411 Support synchronous non-call exceptions
1414 Common Report Var(flag_omit_frame_pointer) Optimization
1415 When possible do not generate stack frames
1417 foptimize-register-move
1418 Common Report Var(flag_regmove) Optimization
1419 Do the full register move optimization pass
1421 foptimize-sibling-calls
1422 Common Report Var(flag_optimize_sibling_calls) Optimization
1423 Optimize sibling and tail recursive calls
1426 Common Report Var(flag_partial_inlining)
1427 Perform partial inlining
1430 Common Report Var(pre_ipa_mem_report)
1431 Report on memory allocation before interprocedural optimization
1433 fpost-ipa-mem-report
1434 Common Report Var(post_ipa_mem_report)
1435 Report on memory allocation before interprocedural optimization
1438 Common Report Var(flag_pack_struct) Optimization
1439 Pack structure members together without holes
1442 Common RejectNegative Joined UInteger Optimization
1443 -fpack-struct=<number> Set initial maximum structure member alignment
1446 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1447 Return small aggregates in memory, not registers
1450 Common Report Var(flag_peel_loops) Optimization
1451 Perform loop peeling
1454 Common Report Var(flag_no_peephole,0) Optimization
1455 Enable machine specific peephole optimizations
1458 Common Report Var(flag_peephole2) Optimization
1459 Enable an RTL peephole pass before sched2
1462 Common Report Var(flag_pic,2)
1463 Generate position-independent code if possible (large mode)
1466 Common Report Var(flag_pie,2)
1467 Generate position-independent code for executables if possible (large mode)
1470 Common Report Var(flag_pic,1)
1471 Generate position-independent code if possible (small mode)
1474 Common Report Var(flag_pie,1)
1475 Generate position-independent code for executables if possible (small mode)
1478 Common Joined RejectNegative Var(common_deferred_options) Defer
1479 Specify a plugin to load
1482 Common Joined RejectNegative Var(common_deferred_options) Defer
1483 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1485 fpredictive-commoning
1486 Common Report Var(flag_predictive_commoning) Optimization
1487 Run predictive commoning optimization.
1489 fprefetch-loop-arrays
1490 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1491 Generate prefetch instructions, if available, for arrays in loops
1494 Common Report Var(profile_flag)
1495 Enable basic program profiling code
1498 Common Report Var(profile_arc_flag)
1499 Insert arc-based program profiling code
1502 Common Joined RejectNegative Var(profile_data_prefix)
1503 Set the top-level directory for storing the profile data.
1504 The default is 'pwd'.
1507 Common Report Var(flag_profile_correction)
1508 Enable correction of flow inconsistent profile data input
1512 Enable common options for generating profile info for profile feedback directed optimizations
1515 Common Joined RejectNegative
1516 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1519 Common Var(flag_profile_use)
1520 Enable common options for performing profile feedback directed optimizations
1523 Common Joined RejectNegative
1524 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1527 Common Report Var(flag_profile_values)
1528 Insert code to profile values of expressions
1531 Common Var(common_deferred_options) Defer
1534 Common Joined RejectNegative Var(common_deferred_options) Defer
1535 -frandom-seed=<string> Make compile reproducible using <string>
1537 ; This switch causes the command line that was used to create an
1538 ; object file to be recorded into the object file. The exact format
1539 ; of this recording is target and binary file format dependent.
1540 ; It is related to the -fverbose-asm switch, but that switch only
1541 ; records information in the assembler output file as comments, so
1542 ; they never reach the object file.
1543 frecord-gcc-switches
1544 Common Report Var(flag_record_gcc_switches)
1545 Record gcc command line switches in the object file.
1548 Common Report Var(flag_pcc_struct_return,0) Optimization
1549 Return small aggregates in registers
1552 Common Report Var(flag_regmove) Optimization
1553 Enables a register move optimization
1556 Common Report Var(flag_rename_registers) Init(2) Optimization
1557 Perform a register renaming optimization pass
1560 Common Report Var(flag_reorder_blocks) Optimization
1561 Reorder basic blocks to improve code placement
1563 freorder-blocks-and-partition
1564 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1565 Reorder basic blocks and partition into hot and cold sections
1568 Common Report Var(flag_reorder_functions) Optimization
1569 Reorder functions to improve code placement
1571 frerun-cse-after-loop
1572 Common Report Var(flag_rerun_cse_after_loop) Optimization
1573 Add a common subexpression elimination pass after loop optimizations
1577 Does nothing. Preserved for backward compatibility.
1580 Common Report Var(flag_rounding_math) Optimization SetByCombined
1581 Disable optimizations that assume default FP rounding behavior
1584 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1585 Enable scheduling across basic blocks
1588 Common Report Var(flag_sched_pressure) Init(0) Optimization
1589 Enable register pressure sensitive insn scheduling
1592 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1593 Allow speculative motion of non-loads
1596 Common Report Var(flag_schedule_speculative_load) Optimization
1597 Allow speculative motion of some loads
1599 fsched-spec-load-dangerous
1600 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1601 Allow speculative motion of more loads
1604 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1605 -fsched-verbose=<number> Set the verbosity level of the scheduler
1607 fsched2-use-superblocks
1608 Common Report Var(flag_sched2_use_superblocks) Optimization
1609 If scheduling post reload, do superblock scheduling
1613 Does nothing. Preserved for backward compatibility.
1616 Common Report Var(flag_schedule_insns) Optimization
1617 Reschedule instructions before register allocation
1620 Common Report Var(flag_schedule_insns_after_reload) Optimization
1621 Reschedule instructions after register allocation
1623 ; This flag should be on when a target implements non-trivial
1624 ; scheduling hooks, maybe saving some information for its own sake.
1625 ; On IA64, for example, this is used for correct bundling.
1626 fselective-scheduling
1627 Common Report Var(flag_selective_scheduling) Optimization
1628 Schedule instructions using selective scheduling algorithm
1630 fselective-scheduling2
1631 Common Report Var(flag_selective_scheduling2) Optimization
1632 Run selective scheduling after reload
1634 fsel-sched-pipelining
1635 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1636 Perform software pipelining of inner loops during selective scheduling
1638 fsel-sched-pipelining-outer-loops
1639 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1640 Perform software pipelining of outer loops during selective scheduling
1642 fsel-sched-reschedule-pipelined
1643 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1644 Reschedule pipelined regions without pipelining
1646 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1647 ; of stalled insns into the ready list.
1648 fsched-stalled-insns
1649 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1650 Allow premature scheduling of queued insns
1652 fsched-stalled-insns=
1653 Common RejectNegative Joined UInteger
1654 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1656 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1657 ; be examined for a dependency on a stalled insn that is candidate for
1658 ; premature removal from the queue of stalled insns into the ready list (has
1659 ; an effect only if the flag 'sched_stalled_insns' is set).
1660 fsched-stalled-insns-dep
1661 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1662 Set dependence distance checking in premature scheduling of queued insns
1664 fsched-stalled-insns-dep=
1665 Common RejectNegative Joined UInteger
1666 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1668 fsched-group-heuristic
1669 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1670 Enable the group heuristic in the scheduler
1672 fsched-critical-path-heuristic
1673 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1674 Enable the critical path heuristic in the scheduler
1676 fsched-spec-insn-heuristic
1677 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1678 Enable the speculative instruction heuristic in the scheduler
1680 fsched-rank-heuristic
1681 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1682 Enable the rank heuristic in the scheduler
1684 fsched-last-insn-heuristic
1685 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1686 Enable the last instruction heuristic in the scheduler
1688 fsched-dep-count-heuristic
1689 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1690 Enable the dependent count heuristic in the scheduler
1693 Common Report Var(flag_section_anchors) Optimization
1694 Access data in the same section from shared anchor points
1698 Does nothing. Preserved for backward compatibility.
1701 Common Report Var(flag_zee) Init(0)
1702 Eliminate redundant zero extensions on targets that support implicit extensions.
1705 Common Report Var(flag_show_column) Init(1)
1706 Show column numbers in diagnostics, when available. Default on
1709 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1710 Disable optimizations observable by IEEE signaling NaNs
1713 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1714 Disable floating point optimizations that ignore the IEEE signedness of zero
1716 fsingle-precision-constant
1717 Common Report Var(flag_single_precision_constant) Optimization
1718 Convert floating point constants to single precision constants
1720 fsplit-ivs-in-unroller
1721 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1722 Split lifetimes of induction variables when loops are unrolled
1725 Common Report Var(flag_split_stack) Init(-1)
1726 Generate discontiguous stack frames
1729 Common Report Var(flag_split_wide_types) Optimization
1730 Split wide types into independent registers
1732 fvariable-expansion-in-unroller
1733 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1734 Apply variable expansion when loops are unrolled
1737 Common Report RejectNegative Joined
1738 -fstack-check=[no|generic|specific] Insert stack checking code into the program
1741 Common Alias(fstack-check=, specific, no)
1742 Insert stack checking code into the program. Same as -fstack-check=specific
1745 Common Var(common_deferred_options) Defer
1747 fstack-limit-register=
1748 Common RejectNegative Joined Var(common_deferred_options) Defer
1749 -fstack-limit-register=<register> Trap if the stack goes past <register>
1751 fstack-limit-symbol=
1752 Common RejectNegative Joined Var(common_deferred_options) Defer
1753 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
1756 Common Report Var(flag_stack_protect, 1)
1757 Use propolice as a stack protection method
1759 fstack-protector-all
1760 Common Report RejectNegative Var(flag_stack_protect, 2)
1761 Use a stack protection method for every function
1764 Common RejectNegative Var(flag_stack_usage)
1765 Output stack usage information on a per-function basis
1769 Does nothing. Preserved for backward compatibility.
1771 ; Nonzero if we should do (language-dependent) alias analysis.
1772 ; Typically, this analysis will assume that expressions of certain
1773 ; types do not alias expressions of certain other types. Only used
1774 ; if alias analysis (in general) is enabled.
1776 Common Report Var(flag_strict_aliasing) Optimization
1777 Assume strict aliasing rules apply
1780 Common Report Var(flag_strict_overflow)
1781 Treat signed overflow as undefined
1784 Common Report Var(flag_syntax_only)
1785 Check for syntax errors, then stop
1788 Common Report Var(flag_test_coverage)
1789 Create data files needed by \"gcov\"
1792 Common Report Var(flag_thread_jumps) Optimization
1793 Perform jump threading optimizations
1796 Common Report Var(time_report)
1797 Report the time taken by each compiler pass
1800 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
1801 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
1804 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
1807 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
1810 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
1813 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
1816 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
1819 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
1820 Reorder top level functions, variables, and asms
1823 Common Report Var(flag_tracer)
1824 Perform superblock formation via tail duplication
1826 ; Zero means that floating-point math operations cannot generate a
1827 ; (user-visible) trap. This is the case, for example, in nonstop
1828 ; IEEE 754 arithmetic.
1830 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
1831 Assume floating-point operations can trap
1834 Common Report Var(flag_trapv) Optimization
1835 Trap for signed overflow in addition, subtraction and multiplication
1838 Common Report Var(flag_tree_ccp) Optimization
1839 Enable SSA-CCP optimization on trees
1842 Common Report Var(flag_tree_bit_ccp) Optimization
1843 Enable SSA-BIT-CCP optimization on trees
1847 Does nothing. Preserved for backward compatibility.
1850 Common Report Var(flag_tree_ch) Optimization
1851 Enable loop header copying on trees
1854 Common Report Var(flag_tree_copyrename) Optimization
1855 Replace SSA temporaries with better names in copies
1858 Common Report Var(flag_tree_copy_prop) Optimization
1859 Enable copy propagation on trees
1861 ftree-store-copy-prop
1863 Does nothing. Preserved for backward compatibility.
1866 Common Report Var(flag_tree_cselim) Init(2) Optimization
1867 Transform condition stores into unconditional ones
1869 ftree-switch-conversion
1870 Common Report Var(flag_tree_switch_conversion) Optimization
1871 Perform conversions of switch initializations.
1874 Common Report Var(flag_tree_dce) Optimization
1875 Enable SSA dead code elimination optimization on trees
1877 ftree-dominator-opts
1878 Common Report Var(flag_tree_dom) Optimization
1879 Enable dominator optimizations
1882 Common Report Var(flag_tree_dse) Optimization
1883 Enable dead store elimination
1886 Common Report Var(flag_tree_forwprop) Init(1) Optimization
1887 Enable forward propagation on trees
1890 Common Report Var(flag_tree_fre) Optimization
1891 Enable Full Redundancy Elimination (FRE) on trees
1893 ftree-loop-distribution
1894 Common Report Var(flag_tree_loop_distribution) Optimization
1895 Enable loop distribution on trees
1897 ftree-loop-distribute-patterns
1898 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
1899 Enable loop distribution for patterns transformed into a library call
1902 Common Report Var(flag_tree_loop_im) Init(1) Optimization
1903 Enable loop invariant motion on trees
1906 Common Alias(floop-interchange)
1907 Enable loop interchange transforms. Same as -floop-interchange
1910 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
1911 Create canonical induction variables in loops
1914 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
1915 Enable loop optimizations on tree level
1917 ftree-parallelize-loops=
1918 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
1919 Enable automatic parallelization of loops
1922 Common Report Var(flag_tree_phiprop) Init(1) Optimization
1923 Enable hoisting loads from conditional pointers.
1926 Common Report Var(flag_tree_pre) Optimization
1927 Enable SSA-PRE optimization on trees
1930 Common Report Var(flag_tree_pta) Init(1) Optimization
1931 Perform function-local points-to analysis on trees.
1934 Common Report Var(flag_tree_reassoc) Init(1) Optimization
1935 Enable reassociation on tree level
1939 Does nothing. Preserved for backward compatibility.
1942 Common Report Var(flag_tree_sink) Optimization
1943 Enable SSA code sinking on trees
1946 Common Report Var(flag_tree_sra) Optimization
1947 Perform scalar replacement of aggregates
1950 Common Report Var(flag_tree_ter) Optimization
1951 Replace temporary expressions in the SSA->normal pass
1954 Common Report Var(flag_tree_live_range_split) Optimization
1955 Perform live range splitting during the SSA->normal pass
1958 Common Report Var(flag_tree_vrp) Init(0) Optimization
1959 Perform Value Range Propagation on trees
1962 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
1963 Compile whole compilation unit at a time
1966 Common Report Var(flag_unroll_loops) Optimization
1967 Perform loop unrolling when iteration count is known
1970 Common Report Var(flag_unroll_all_loops) Optimization
1971 Perform loop unrolling for all loops
1973 ; Nonzero means that loop optimizer may assume that the induction variables
1974 ; that control loops do not overflow and that the loops with nontrivial
1975 ; exit condition are not infinite
1976 funsafe-loop-optimizations
1977 Common Report Var(flag_unsafe_loop_optimizations) Optimization
1978 Allow loop optimizations to assume that the loops behave in normal way
1981 Common Report Var(flag_associative_math) SetByCombined
1982 Allow optimization for floating-point arithmetic which may change the
1983 result of the operation due to rounding.
1986 Common Report Var(flag_reciprocal_math) SetByCombined
1987 Same as -fassociative-math for expressions which include division.
1989 ; Nonzero means that unsafe floating-point math optimizations are allowed
1990 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
1991 ; are allowed to assume that their arguments and results are "normal"
1992 ; (e.g., nonnegative for SQRT).
1993 funsafe-math-optimizations
1994 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
1995 Allow math optimizations that may violate IEEE or ISO standards
1998 Common Report Var(flag_unswitch_loops) Optimization
1999 Perform loop unswitching
2002 Common Report Var(flag_unwind_tables) Optimization
2003 Just generate unwind tables for exception handling
2008 ; Positive if we should track variables, negative if we should run
2009 ; the var-tracking pass only to discard debug annotations, zero if
2010 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2011 ; will be set according to optimize, debug_info_level and debug_hooks
2012 ; in process_options ().
2014 Common Report Var(flag_var_tracking) Init(2) Optimization
2015 Perform variable tracking
2017 ; Positive if we should track variables at assignments, negative if
2018 ; we should run the var-tracking pass only to discard debug
2019 ; annotations. When flag_var_tracking_assignments ==
2020 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2021 fvar-tracking-assignments
2022 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2023 Perform variable tracking by annotating assignments
2025 ; Nonzero if we should toggle flag_var_tracking_assignments after
2026 ; processing options and computing its default. */
2027 fvar-tracking-assignments-toggle
2028 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2029 Toggle -fvar-tracking-assignments
2031 fvar-tracking-uninit
2032 Common Report Var(flag_var_tracking_uninit) Optimization
2033 Perform variable tracking and also tag variables that are uninitialized
2036 Common Report Var(flag_tree_vectorize) Optimization
2037 Enable loop vectorization on trees
2040 Common Report Var(flag_tree_slp_vectorize) Init(2) Optimization
2041 Enable basic block vectorization (SLP) on trees
2044 Common Report Var(flag_vect_cost_model) Optimization
2045 Enable use of cost model in vectorization
2047 ftree-vect-loop-version
2048 Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization
2049 Enable loop versioning when doing loop vectorization on trees
2051 ftree-vectorizer-verbose=
2052 Common RejectNegative Joined UInteger
2053 -ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
2056 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2057 Enable copy propagation of scalar-evolution information.
2059 ; -fverbose-asm causes extra commentary information to be produced in
2060 ; the generated assembly code (to make it more readable). This option
2061 ; is generally only of use to those who actually need to read the
2062 ; generated assembly code (perhaps while debugging the compiler itself).
2063 ; -fno-verbose-asm, the default, causes the extra information
2064 ; to not be added and is useful when comparing two assembler files.
2066 Common Report Var(flag_verbose_asm)
2067 Add extra commentary to assembler output
2070 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2071 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2074 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2077 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2080 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2083 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2086 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2089 Common Report Var(flag_value_profile_transformations) Optimization
2090 Use expression value profiles in optimizations
2093 Common Report Var(flag_web) Init(2) Optimization
2094 Construct webs and split unrelated uses of single variable
2096 ftree-builtin-call-dce
2097 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2098 Enable conditional dead code elimination for builtin calls
2101 Common Report Var(flag_whole_program) Init(0) Optimization
2102 Perform whole program optimizations
2105 Common Report Var(flag_wrapv) Optimization
2106 Assume signed arithmetic overflow wraps around
2108 fzero-initialized-in-bss
2109 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2110 Put zero initialized data in the bss section
2113 Common JoinedOrMissing
2114 Generate debug information in default format
2117 Common JoinedOrMissing Negative(gdwarf-)
2118 Generate debug information in COFF format
2121 Common Joined UInteger Var(dwarf_version) Init(2) Negative(gstabs)
2122 Generate debug information in DWARF v2 (or later) format
2125 Common JoinedOrMissing
2126 Generate debug information in default extended format
2129 Common JoinedOrMissing Negative(gstabs+)
2130 Generate debug information in STABS format
2133 Common JoinedOrMissing Negative(gvms)
2134 Generate debug information in extended STABS format
2137 Common RejectNegative Var(dwarf_strict,0) Init(-1)
2138 Emit DWARF additions beyond selected version
2141 Common Report RejectNegative Var(dwarf_strict,1)
2142 Don't emit DWARF additions beyond selected version
2145 Common Report Var(flag_gtoggle)
2146 Toggle debug information generation
2149 Common JoinedOrMissing Negative(gxcoff)
2150 Generate debug information in VMS format
2153 Common JoinedOrMissing Negative(gxcoff+)
2154 Generate debug information in XCOFF format
2157 Common JoinedOrMissing Negative(gcoff)
2158 Generate debug information in extended XCOFF format
2161 Driver Joined Separate
2164 Common Joined Var(plugindir_string) Init(0)
2165 -iplugindir=<dir> Set <dir> to be the default plugin directory
2168 Driver Joined Separate
2173 no-canonical-prefixes
2183 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2184 -o <file> Place output into <file>
2187 Common Var(profile_flag)
2188 Enable function profiling
2191 Driver Var(pass_exit_codes)
2194 Common Var(pedantic)
2195 Issue warnings needed for strict compliance to the standard
2198 Common Var(flag_pedantic_errors)
2199 Like -pedantic but issue them as errors
2205 Driver Var(use_pipes)
2208 Driver JoinedOrMissing Var(print_file_name)
2210 print-libgcc-file-name
2213 print-multi-directory
2214 Driver Var(print_multi_directory)
2217 Driver Var(print_multi_lib)
2219 print-multi-os-directory
2220 Driver Var(print_multi_os_directory)
2223 Driver JoinedOrMissing Var(print_prog_name)
2226 Driver Var(print_search_dirs)
2229 Driver Var(print_sysroot)
2231 print-sysroot-headers-suffix
2232 Driver Var(print_sysroot_headers_suffix)
2235 Common Var(quiet_flag) RejectDriver
2236 Do not display functions compiled or elapsed time
2254 Driver Var(report_times)
2257 Driver JoinedOrMissing
2260 Driver Joined Separate
2264 ; C option, but driver must not handle as "-u ndef".
2267 Common Driver Var(verbose_flag)
2268 Enable verbose output
2271 Common Var(version_flag) RejectDriver
2272 Display the compiler's version
2275 Common Var(inhibit_warnings)
2279 Driver Separate Var(wrapper_string)
2282 Driver Joined Separate
2285 Common RejectNegative Negative(pie)
2286 Create a shared library
2292 Driver Separate Alias(specs=)
2305 ; Documented for Fortran, but always accepted by driver.
2312 ; Documented for Go, but always accepted by driver.
2318 Common RejectNegative Negative(shared)
2319 Create a position independent executable
2322 Driver Joined Separate
2324 ; This comment is to ensure we retain the blank line above.