1 ; Options for the language- and target-independent parts of the compiler.
3 ; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4 ; Free Software Foundation, Inc.
6 ; This file is part of GCC.
8 ; GCC is free software; you can redistribute it and/or modify it under
9 ; the terms of the GNU General Public License as published by the Free
10 ; Software Foundation; either version 3, or (at your option) any later
13 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 ; You should have received a copy of the GNU General Public License
19 ; along with GCC; see the file COPYING3. If not see
20 ; <http://www.gnu.org/licenses/>.
22 ; See the GCC internals manual (options.texi) for a description of this file's format.
24 ; Please try to keep this file in ASCII collating order.
35 ; 0 means straightforward implementation of complex divide acceptable.
36 ; 1 means wide ranges of inputs must work for complex divide.
37 ; 2 means C99-like requirements for complex multiply and divide.
39 int flag_complex_method = 1
41 ; Nonzero if subexpressions must be evaluated from left-to-right.
43 int flag_evaluation_order = 0
45 ; 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 Var(flag_conserve_stack) Optimization
858 Do not perform optimizations increasing noticeably stack usage
861 Common Report Var(flag_cprop_registers) Optimization
862 Perform a register copy-propagation optimization pass
865 Common Report Var(flag_crossjumping) Optimization
866 Perform cross-jumping optimization
869 Common Report Var(flag_cse_follow_jumps) Optimization
870 When running CSE, follow jumps to their targets
874 Does nothing. Preserved for backward compatibility.
877 Common Report Var(flag_cx_limited_range) Optimization
878 Omit range reduction step when performing complex division
881 Common Report Var(flag_cx_fortran_rules) Optimization
882 Complex multiplication and division follow Fortran rules
885 Common Report Var(flag_data_sections) Optimization
886 Place data items into their own section
889 Common Report Var(common_deferred_options) Defer
890 List all available debugging counters with their limits and counts.
893 Common RejectNegative Joined Var(common_deferred_options) Defer
894 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
897 Common Joined RejectNegative Var(common_deferred_options) Defer
898 Map one directory name to another in debug information
900 ; Nonzero for -fdefer-pop: don't pop args after each function call
901 ; instead save them up to pop many calls' args with one insns.
903 Common Report Var(flag_defer_pop) Optimization
904 Defer popping functions args from stack until later
907 Common Report Var(flag_delayed_branch) Optimization
908 Attempt to fill delay slots of branch instructions
910 fdelete-null-pointer-checks
911 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
912 Delete useless null pointer checks
914 fdiagnostics-show-location=
915 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
916 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
918 ; Required for these enum values.
923 Name(diagnostic_prefixing_rule) Type(int)
926 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
929 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
931 fdiagnostics-show-option
932 Common Var(flag_diagnostics_show_option) Init(1)
933 Amend appropriate diagnostic messages with the command line option that controls them
936 Common Joined RejectNegative Var(common_deferred_options) Defer
937 -fdump-<type> Dump various compiler internals to a file
940 Driver RejectNegative
943 Common RejectNegative Joined Var(flag_dump_final_insns)
944 -fdump-final-insns=filename Dump to filename the insns at the end of translation
947 Common RejectNegative Joined Var(flag_dump_go_spec)
948 -fdump-go-spec=filename Write all declarations to file as Go code
951 Common Report Var(flag_dump_noaddr)
952 Suppress output of addresses in debugging dumps
955 Common Report Var(flag_dump_unnumbered)
956 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
958 fdump-unnumbered-links
959 Common Report Var(flag_dump_unnumbered_links)
960 Suppress output of previous and next insn numbers in debugging dumps
963 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
964 Enable CFI tables via GAS assembler directives.
967 Common Report Var(flag_early_inlining) Init(1) Optimization
968 Perform early inlining
970 feliminate-dwarf2-dups
971 Common Report Var(flag_eliminate_dwarf2_dups)
972 Perform DWARF2 duplicate elimination
975 Common Report Var(flag_ipa_sra) Init(0) Optimization
976 Perform interprocedural reduction of aggregates
978 feliminate-unused-debug-symbols
979 Common Report Var(flag_debug_only_used_symbols)
980 Perform unused type elimination in debug info
982 feliminate-unused-debug-types
983 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
984 Perform unused type elimination in debug info
986 femit-class-debug-always
987 Common Report Var(flag_emit_class_debug_always) Init(0)
988 Do not suppress C++ class debug information.
991 Common Report Var(flag_enable_icf_debug)
992 Generate debug information to support Identical Code Folding (ICF)
995 Common Report Var(flag_exceptions) Optimization
996 Enable exception handling
998 fexpensive-optimizations
999 Common Report Var(flag_expensive_optimizations) Optimization
1000 Perform a number of minor, expensive optimizations
1003 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1004 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1007 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1010 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1013 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1019 Common Report Var(flag_finite_math_only) Optimization
1020 Assume no NaNs or infinities are generated
1023 Common Joined RejectNegative Var(common_deferred_options) Defer
1024 -ffixed-<register> Mark <register> as being unavailable to the compiler
1027 Common Report Var(flag_float_store) Optimization
1028 Don't allocate floats and doubles in extended-precision registers
1032 Does nothing. Preserved for backward compatibility.
1035 Common Report Var(flag_forward_propagate) Optimization
1036 Perform a forward propagation pass on RTL
1039 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1040 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1043 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1046 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1048 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1050 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1053 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1055 ; Nonzero means don't put addresses of constant functions in registers.
1056 ; Used for compiling the Unix kernel, where strange substitutions are
1057 ; done on the assembly output.
1059 Common Report Var(flag_no_function_cse,0)
1060 Allow function addresses to be held in registers
1063 Common Report Var(flag_function_sections)
1064 Place each function into its own section
1067 Common Report Var(flag_gcse) Optimization
1068 Perform global common subexpression elimination
1071 Common Report Var(flag_gcse_lm) Init(1) Optimization
1072 Perform enhanced load motion during global common subexpression elimination
1075 Common Report Var(flag_gcse_sm) Init(0) Optimization
1076 Perform store motion after global common subexpression elimination
1079 Common Report Var(flag_gcse_las) Init(0) Optimization
1080 Perform redundant load after store elimination in global common subexpression
1084 Common Report Var(flag_gcse_after_reload) Optimization
1085 Perform global common subexpression elimination after register allocation
1088 ; This option is not documented yet as its semantics will change.
1090 Common Report Var(flag_graphite)
1091 Enable in and out of Graphite representation
1093 ; This option is not documented yet as it is for debugging only.
1094 fgraphite-cloog-opts
1095 Common Report Var(flag_graphite_cloog_opts) Optimization
1096 Turn On Cloog Optimizations in Graphite
1099 Common Report Var(flag_graphite_identity) Optimization
1100 Enable Graphite Identity transformation
1102 ; This option is not documented as it does not perform any useful optimization.
1104 Common Report Var(flag_graphite_write) Optimization
1105 Write Graphite transformation file
1107 ; This option is not documented as it does not perform any useful optimization.
1109 Common Report Var(flag_graphite_read) Optimization
1110 Read Graphite transformation file
1112 ; This option is not documented yet as it is for debugging only.
1113 fgraphite-dump-cloog
1114 Common Report Var(flag_graphite_dump_cloog) Optimization
1115 Write CLooG compatible input file
1117 ; This option is not documented as it will be removed
1118 floop-parallelize-all
1119 Common Report Var(flag_loop_parallelize_all) Optimization
1120 Mark all loops as parallel
1123 Common Report Var(flag_loop_strip_mine) Optimization
1124 Enable Loop Strip Mining transformation
1127 Common Report Var(flag_loop_interchange) Optimization
1128 Enable Loop Interchange transformation
1131 Common Report Var(flag_loop_block) Optimization
1132 Enable Loop Blocking transformation
1135 Common Report Var(flag_loop_flatten) Optimization
1136 Enable Loop Flattening transformation
1138 fstrict-volatile-bitfields
1139 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1140 Force bitfield accesses to match their type width
1142 fguess-branch-probability
1143 Common Report Var(flag_guess_branch_prob) Optimization
1144 Enable guessing of branch probabilities
1146 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1147 ; Generate position-independent code for executables if possible
1148 ; On SVR4 targets, it also controls whether or not to emit a
1149 ; string identifying the compiler.
1151 Common Report Var(flag_no_ident,0)
1152 Process #ident directives
1155 Common Report Var(flag_if_conversion) Optimization
1156 Perform conversion of conditional jumps to branchless equivalents
1159 Common Report Var(flag_if_conversion2) Optimization
1160 Perform conversion of conditional jumps to conditional execution
1162 ftree-loop-if-convert
1163 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1164 Convert conditional jumps in innermost loops to branchless equivalents
1166 ftree-loop-if-convert-stores
1167 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1168 Also if-convert conditional jumps containing memory writes
1170 ; -finhibit-size-directive inhibits output of .size for ELF.
1171 ; This is used only for compiling crtstuff.c,
1172 ; and it may be extended to other effects
1173 ; needed for crtstuff.c on other systems.
1174 finhibit-size-directive
1175 Common Report Var(flag_inhibit_size_directive)
1176 Do not generate .size directives
1179 Common Report Var(flag_indirect_inlining)
1180 Perform indirect inlining
1182 ; Nonzero means that functions declared `inline' will be treated
1183 ; as `static'. Prevents generation of zillions of copies of unused
1184 ; static inline functions; instead, `inlines' are written out
1185 ; only when actually used. Used in conjunction with -g. Also
1186 ; does the right thing with #pragma interface.
1188 Common Report Var(flag_no_inline,0) Init(0)
1189 Pay attention to the \"inline\" keyword
1191 finline-small-functions
1192 Common Report Var(flag_inline_small_functions) Optimization
1193 Integrate simple functions into their callers when code size is known to not growth
1196 Common Report Var(flag_inline_functions) Optimization
1197 Integrate simple functions into their callers
1199 finline-functions-called-once
1200 Common Report Var(flag_inline_functions_called_once) Init(1) Optimization
1201 Integrate functions called once into their callers
1204 Common RejectNegative Joined Alias(finline-limit=)
1207 Common RejectNegative Joined UInteger
1208 -finline-limit=<number> Limit the size of inlined functions to <number>
1210 finstrument-functions
1211 Common Report Var(flag_instrument_function_entry_exit)
1212 Instrument function entry and exit with profiling calls
1214 finstrument-functions-exclude-function-list=
1215 Common RejectNegative Joined
1216 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1218 finstrument-functions-exclude-file-list=
1219 Common RejectNegative Joined
1220 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1223 Common Report Var(flag_ipa_cp) Optimization
1224 Perform Interprocedural constant propagation
1227 Common Report Var(flag_ipa_cp_clone) Optimization
1228 Perform cloning to make Interprocedural constant propagation stronger
1231 Common Report Var(flag_ipa_profile) Init(0) Optimization
1232 Perform interprocedural profile propagation
1235 Common Report Var(flag_ipa_pta) Init(0) Optimization
1236 Perform interprocedural points-to analysis
1239 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1240 Discover pure and const functions
1243 Common Report Var(flag_ipa_reference) Init(0) Optimization
1244 Discover readonly and non addressable static variables
1247 Common Report Var(flag_ipa_matrix_reorg) Optimization
1248 Perform matrix layout flattening and transposing based
1249 on profiling information.
1252 Common Report Var(flag_ipa_struct_reorg)
1253 Perform structure layout optimizations based
1254 on profiling information.
1257 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1258 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1261 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1264 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1267 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1270 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_MIXED)
1271 -fira-region=[one|all|mixed] Set regions for IRA
1274 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1277 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1280 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1283 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1286 Common Report Var(flag_ira_loop_pressure)
1287 Use IRA based register pressure calculation
1288 in RTL loop optimizations.
1290 fira-share-save-slots
1291 Common Report Var(flag_ira_share_save_slots) Init(1)
1292 Share slots for saving different hard registers.
1294 fira-share-spill-slots
1295 Common Report Var(flag_ira_share_spill_slots) Init(1)
1296 Share stack slots for spilled pseudo-registers.
1299 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1300 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1303 Common Report Var(flag_ivopts) Init(1) Optimization
1304 Optimize induction variables on trees
1307 Common Var(flag_jump_tables) Init(1) Optimization
1308 Use jump tables for sufficiently large switch statements
1310 fkeep-inline-functions
1311 Common Report Var(flag_keep_inline_functions)
1312 Generate code for functions even if they are fully inlined
1315 Common Report Var(flag_keep_static_consts) Init(1)
1316 Emit static const variables even if they are not used
1319 Common Report Var(flag_leading_underscore) Init(-1)
1320 Give external symbols a leading underscore
1324 Does nothing. Preserved for backward compatibility.
1328 Enable link-time optimization.
1331 Common RejectNegative Joined Var(flag_lto)
1332 Link-time optimization with number of parallel jobs or jobserver.
1335 Common Var(flag_lto_partition_1to1)
1336 Partition functions and vars at linktime based on object files they originate from
1338 flto-partition=balanced
1339 Common Var(flag_lto_partition_balanced)
1340 Partition functions and vars at linktime into approximately same sized buckets
1343 Common Var(flag_lto_partition_none)
1344 Disable partioning and streaming
1346 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1347 flto-compression-level=
1348 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1349 -flto-compression-level=<number> Use zlib compression level <number> for IL
1352 Common Report Var(flag_lto_report) Init(0) Optimization
1353 Report various link-time optimization statistics
1356 Common Report Var(flag_errno_math) Init(1) Optimization
1357 Set errno after built-in math functions
1360 Common Joined RejectNegative UInteger Var(flag_max_errors)
1361 -fmax-errors=<number> Maximum number of errors to report
1364 Common Report Var(mem_report)
1365 Report on permanent memory allocation
1367 ; This will attempt to merge constant section constants, if 1 only
1368 ; string constants and constants from constant pool, if 2 also constant
1370 fmerge-all-constants
1371 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1372 Attempt to merge identical constants and constant variables
1375 Common Report Var(flag_merge_constants,1) Optimization
1376 Attempt to merge identical constants across compilation units
1378 fmerge-debug-strings
1379 Common Report Var(flag_merge_debug_strings) Init(1)
1380 Attempt to merge identical debug strings across compilation units
1383 Common RejectNegative Joined UInteger
1384 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1387 Common Report Var(flag_modulo_sched) Optimization
1388 Perform SMS based modulo scheduling before the first scheduling pass
1390 fmodulo-sched-allow-regmoves
1391 Common Report Var(flag_modulo_sched_allow_regmoves)
1392 Perform SMS based modulo scheduling with register moves allowed
1394 fmove-loop-invariants
1395 Common Report Var(flag_move_loop_invariants) Init(1) Optimization
1396 Move loop invariant computations out of loops
1399 Common RejectNegative Report Var(flag_mudflap)
1400 Add mudflap bounds-checking instrumentation for single-threaded program
1403 Common RejectNegative Report Var(flag_mudflap,2)
1404 Add mudflap bounds-checking instrumentation for multi-threaded program
1407 Common RejectNegative Report Var(flag_mudflap_ignore_reads)
1408 Ignore read operations when inserting mudflap instrumentation
1411 Common Var(flag_dce) Init(1) Optimization
1412 Use the RTL dead code elimination pass
1415 Common Var(flag_dse) Init(1) Optimization
1416 Use the RTL dead store elimination pass
1418 freschedule-modulo-scheduled-loops
1419 Common Report Var(flag_resched_modulo_sched) Optimization
1420 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1422 fnon-call-exceptions
1423 Common Report Var(flag_non_call_exceptions) Optimization
1424 Support synchronous non-call exceptions
1427 Common Report Var(flag_omit_frame_pointer) Optimization
1428 When possible do not generate stack frames
1430 foptimize-register-move
1431 Common Report Var(flag_regmove) Optimization
1432 Do the full register move optimization pass
1434 foptimize-sibling-calls
1435 Common Report Var(flag_optimize_sibling_calls) Optimization
1436 Optimize sibling and tail recursive calls
1439 Common Report Var(flag_partial_inlining)
1440 Perform partial inlining
1443 Common Report Var(pre_ipa_mem_report)
1444 Report on memory allocation before interprocedural optimization
1446 fpost-ipa-mem-report
1447 Common Report Var(post_ipa_mem_report)
1448 Report on memory allocation before interprocedural optimization
1451 Common Report Var(flag_pack_struct) Optimization
1452 Pack structure members together without holes
1455 Common RejectNegative Joined UInteger Optimization
1456 -fpack-struct=<number> Set initial maximum structure member alignment
1459 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1460 Return small aggregates in memory, not registers
1463 Common Report Var(flag_peel_loops) Optimization
1464 Perform loop peeling
1467 Common Report Var(flag_no_peephole,0) Optimization
1468 Enable machine specific peephole optimizations
1471 Common Report Var(flag_peephole2) Optimization
1472 Enable an RTL peephole pass before sched2
1475 Common Report Var(flag_pic,2)
1476 Generate position-independent code if possible (large mode)
1479 Common Report Var(flag_pie,2)
1480 Generate position-independent code for executables if possible (large mode)
1483 Common Report Var(flag_pic,1)
1484 Generate position-independent code if possible (small mode)
1487 Common Report Var(flag_pie,1)
1488 Generate position-independent code for executables if possible (small mode)
1491 Common Joined RejectNegative Var(common_deferred_options) Defer
1492 Specify a plugin to load
1495 Common Joined RejectNegative Var(common_deferred_options) Defer
1496 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1498 fpredictive-commoning
1499 Common Report Var(flag_predictive_commoning) Optimization
1500 Run predictive commoning optimization.
1502 fprefetch-loop-arrays
1503 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1504 Generate prefetch instructions, if available, for arrays in loops
1507 Common Report Var(profile_flag)
1508 Enable basic program profiling code
1511 Common Report Var(profile_arc_flag)
1512 Insert arc-based program profiling code
1515 Common Joined RejectNegative Var(profile_data_prefix)
1516 Set the top-level directory for storing the profile data.
1517 The default is 'pwd'.
1520 Common Report Var(flag_profile_correction)
1521 Enable correction of flow inconsistent profile data input
1525 Enable common options for generating profile info for profile feedback directed optimizations
1528 Common Joined RejectNegative
1529 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1532 Common Var(flag_profile_use)
1533 Enable common options for performing profile feedback directed optimizations
1536 Common Joined RejectNegative
1537 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1540 Common Report Var(flag_profile_values)
1541 Insert code to profile values of expressions
1544 Common Var(common_deferred_options) Defer
1547 Common Joined RejectNegative Var(common_deferred_options) Defer
1548 -frandom-seed=<string> Make compile reproducible using <string>
1550 ; This switch causes the command line that was used to create an
1551 ; object file to be recorded into the object file. The exact format
1552 ; of this recording is target and binary file format dependent.
1553 ; It is related to the -fverbose-asm switch, but that switch only
1554 ; records information in the assembler output file as comments, so
1555 ; they never reach the object file.
1556 frecord-gcc-switches
1557 Common Report Var(flag_record_gcc_switches)
1558 Record gcc command line switches in the object file.
1561 Common Report Var(flag_pcc_struct_return,0) Optimization
1562 Return small aggregates in registers
1565 Common Report Var(flag_regmove) Optimization
1566 Enables a register move optimization
1569 Common Report Var(flag_rename_registers) Init(2) Optimization
1570 Perform a register renaming optimization pass
1573 Common Report Var(flag_reorder_blocks) Optimization
1574 Reorder basic blocks to improve code placement
1576 freorder-blocks-and-partition
1577 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1578 Reorder basic blocks and partition into hot and cold sections
1581 Common Report Var(flag_reorder_functions) Optimization
1582 Reorder functions to improve code placement
1584 frerun-cse-after-loop
1585 Common Report Var(flag_rerun_cse_after_loop) Optimization
1586 Add a common subexpression elimination pass after loop optimizations
1590 Does nothing. Preserved for backward compatibility.
1593 Common Report Var(flag_rounding_math) Optimization
1594 Disable optimizations that assume default FP rounding behavior
1597 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1598 Enable scheduling across basic blocks
1601 Common Report Var(flag_sched_pressure) Init(0) Optimization
1602 Enable register pressure sensitive insn scheduling
1605 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1606 Allow speculative motion of non-loads
1609 Common Report Var(flag_schedule_speculative_load) Optimization
1610 Allow speculative motion of some loads
1612 fsched-spec-load-dangerous
1613 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1614 Allow speculative motion of more loads
1617 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1618 -fsched-verbose=<number> Set the verbosity level of the scheduler
1620 fsched2-use-superblocks
1621 Common Report Var(flag_sched2_use_superblocks) Optimization
1622 If scheduling post reload, do superblock scheduling
1626 Does nothing. Preserved for backward compatibility.
1629 Common Report Var(flag_schedule_insns) Optimization
1630 Reschedule instructions before register allocation
1633 Common Report Var(flag_schedule_insns_after_reload) Optimization
1634 Reschedule instructions after register allocation
1636 ; This flag should be on when a target implements non-trivial
1637 ; scheduling hooks, maybe saving some information for its own sake.
1638 ; On IA64, for example, this is used for correct bundling.
1639 fselective-scheduling
1640 Common Report Var(flag_selective_scheduling) Optimization
1641 Schedule instructions using selective scheduling algorithm
1643 fselective-scheduling2
1644 Common Report Var(flag_selective_scheduling2) Optimization
1645 Run selective scheduling after reload
1647 fsel-sched-pipelining
1648 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1649 Perform software pipelining of inner loops during selective scheduling
1651 fsel-sched-pipelining-outer-loops
1652 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1653 Perform software pipelining of outer loops during selective scheduling
1655 fsel-sched-reschedule-pipelined
1656 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1657 Reschedule pipelined regions without pipelining
1659 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1660 ; of stalled insns into the ready list.
1661 fsched-stalled-insns
1662 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1663 Allow premature scheduling of queued insns
1665 fsched-stalled-insns=
1666 Common RejectNegative Joined UInteger
1667 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1669 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1670 ; be examined for a dependency on a stalled insn that is candidate for
1671 ; premature removal from the queue of stalled insns into the ready list (has
1672 ; an effect only if the flag 'sched_stalled_insns' is set).
1673 fsched-stalled-insns-dep
1674 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1675 Set dependence distance checking in premature scheduling of queued insns
1677 fsched-stalled-insns-dep=
1678 Common RejectNegative Joined UInteger
1679 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1681 fsched-group-heuristic
1682 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1683 Enable the group heuristic in the scheduler
1685 fsched-critical-path-heuristic
1686 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1687 Enable the critical path heuristic in the scheduler
1689 fsched-spec-insn-heuristic
1690 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1691 Enable the speculative instruction heuristic in the scheduler
1693 fsched-rank-heuristic
1694 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1695 Enable the rank heuristic in the scheduler
1697 fsched-last-insn-heuristic
1698 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1699 Enable the last instruction heuristic in the scheduler
1701 fsched-dep-count-heuristic
1702 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1703 Enable the dependent count heuristic in the scheduler
1706 Common Report Var(flag_section_anchors) Optimization
1707 Access data in the same section from shared anchor points
1711 Does nothing. Preserved for backward compatibility.
1714 Common Report Var(flag_zee) Init(0)
1715 Eliminate redundant zero extensions on targets that support implicit extensions.
1718 Common Report Var(flag_show_column) Init(1)
1719 Show column numbers in diagnostics, when available. Default on
1722 Common Report Var(flag_signaling_nans) Optimization
1723 Disable optimizations observable by IEEE signaling NaNs
1726 Common Report Var(flag_signed_zeros) Init(1) Optimization
1727 Disable floating point optimizations that ignore the IEEE signedness of zero
1729 fsingle-precision-constant
1730 Common Report Var(flag_single_precision_constant) Optimization
1731 Convert floating point constants to single precision constants
1733 fsplit-ivs-in-unroller
1734 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1735 Split lifetimes of induction variables when loops are unrolled
1738 Common Report Var(flag_split_stack) Init(-1)
1739 Generate discontiguous stack frames
1742 Common Report Var(flag_split_wide_types) Optimization
1743 Split wide types into independent registers
1745 fvariable-expansion-in-unroller
1746 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1747 Apply variable expansion when loops are unrolled
1750 Common Report RejectNegative Joined
1751 -fstack-check=[no|generic|specific] Insert stack checking code into the program
1754 Common Alias(fstack-check=, specific, no)
1755 Insert stack checking code into the program. Same as -fstack-check=specific
1758 Common Var(common_deferred_options) Defer
1760 fstack-limit-register=
1761 Common RejectNegative Joined Var(common_deferred_options) Defer
1762 -fstack-limit-register=<register> Trap if the stack goes past <register>
1764 fstack-limit-symbol=
1765 Common RejectNegative Joined Var(common_deferred_options) Defer
1766 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
1769 Common Report Var(flag_stack_protect, 1)
1770 Use propolice as a stack protection method
1772 fstack-protector-all
1773 Common Report RejectNegative Var(flag_stack_protect, 2)
1774 Use a stack protection method for every function
1777 Common RejectNegative Var(flag_stack_usage)
1778 Output stack usage information on a per-function basis
1782 Does nothing. Preserved for backward compatibility.
1784 ; Nonzero if we should do (language-dependent) alias analysis.
1785 ; Typically, this analysis will assume that expressions of certain
1786 ; types do not alias expressions of certain other types. Only used
1787 ; if alias analysis (in general) is enabled.
1789 Common Report Var(flag_strict_aliasing) Optimization
1790 Assume strict aliasing rules apply
1793 Common Report Var(flag_strict_overflow)
1794 Treat signed overflow as undefined
1797 Common Report Var(flag_syntax_only)
1798 Check for syntax errors, then stop
1801 Common Report Var(flag_test_coverage)
1802 Create data files needed by \"gcov\"
1805 Common Report Var(flag_thread_jumps) Optimization
1806 Perform jump threading optimizations
1809 Common Report Var(time_report)
1810 Report the time taken by each compiler pass
1813 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
1814 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
1817 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
1820 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
1823 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
1826 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
1829 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
1832 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
1833 Reorder top level functions, variables, and asms
1836 Common Report Var(flag_tracer)
1837 Perform superblock formation via tail duplication
1839 ; Zero means that floating-point math operations cannot generate a
1840 ; (user-visible) trap. This is the case, for example, in nonstop
1841 ; IEEE 754 arithmetic.
1843 Common Report Var(flag_trapping_math) Init(1) Optimization
1844 Assume floating-point operations can trap
1847 Common Report Var(flag_trapv) Optimization
1848 Trap for signed overflow in addition, subtraction and multiplication
1851 Common Report Var(flag_tree_ccp) Optimization
1852 Enable SSA-CCP optimization on trees
1855 Common Report Var(flag_tree_bit_ccp) Optimization
1856 Enable SSA-BIT-CCP optimization on trees
1860 Does nothing. Preserved for backward compatibility.
1863 Common Report Var(flag_tree_ch) Optimization
1864 Enable loop header copying on trees
1867 Common Report Var(flag_tree_copyrename) Optimization
1868 Replace SSA temporaries with better names in copies
1871 Common Report Var(flag_tree_copy_prop) Optimization
1872 Enable copy propagation on trees
1874 ftree-store-copy-prop
1876 Does nothing. Preserved for backward compatibility.
1879 Common Report Var(flag_tree_cselim) Init(2) Optimization
1880 Transform condition stores into unconditional ones
1882 ftree-switch-conversion
1883 Common Report Var(flag_tree_switch_conversion) Optimization
1884 Perform conversions of switch initializations.
1887 Common Report Var(flag_tree_dce) Optimization
1888 Enable SSA dead code elimination optimization on trees
1890 ftree-dominator-opts
1891 Common Report Var(flag_tree_dom) Optimization
1892 Enable dominator optimizations
1895 Common Report Var(flag_tree_dse) Optimization
1896 Enable dead store elimination
1899 Common Report Var(flag_tree_forwprop) Init(1) Optimization
1900 Enable forward propagation on trees
1903 Common Report Var(flag_tree_fre) Optimization
1904 Enable Full Redundancy Elimination (FRE) on trees
1906 ftree-loop-distribution
1907 Common Report Var(flag_tree_loop_distribution) Optimization
1908 Enable loop distribution on trees
1910 ftree-loop-distribute-patterns
1911 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
1912 Enable loop distribution for patterns transformed into a library call
1915 Common Report Var(flag_tree_loop_im) Init(1) Optimization
1916 Enable loop invariant motion on trees
1919 Common Report Var(flag_tree_loop_linear) Optimization
1920 Enable linear loop transforms on trees
1923 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
1924 Create canonical induction variables in loops
1927 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
1928 Enable loop optimizations on tree level
1930 ftree-parallelize-loops=
1931 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
1932 Enable automatic parallelization of loops
1935 Common Report Var(flag_tree_phiprop) Init(1) Optimization
1936 Enable hoisting loads from conditional pointers.
1939 Common Report Var(flag_tree_pre) Optimization
1940 Enable SSA-PRE optimization on trees
1943 Common Report Var(flag_tree_pta) Init(1) Optimization
1944 Perform function-local points-to analysis on trees.
1947 Common Report Var(flag_tree_reassoc) Init(1) Optimization
1948 Enable reassociation on tree level
1952 Does nothing. Preserved for backward compatibility.
1955 Common Report Var(flag_tree_sink) Optimization
1956 Enable SSA code sinking on trees
1959 Common Report Var(flag_tree_sra) Optimization
1960 Perform scalar replacement of aggregates
1963 Common Report Var(flag_tree_ter) Optimization
1964 Replace temporary expressions in the SSA->normal pass
1967 Common Report Var(flag_tree_live_range_split) Optimization
1968 Perform live range splitting during the SSA->normal pass
1971 Common Report Var(flag_tree_vrp) Init(0) Optimization
1972 Perform Value Range Propagation on trees
1975 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
1976 Compile whole compilation unit at a time
1979 Common Report Var(flag_unroll_loops) Optimization
1980 Perform loop unrolling when iteration count is known
1983 Common Report Var(flag_unroll_all_loops) Optimization
1984 Perform loop unrolling for all loops
1986 ; Nonzero means that loop optimizer may assume that the induction variables
1987 ; that control loops do not overflow and that the loops with nontrivial
1988 ; exit condition are not infinite
1989 funsafe-loop-optimizations
1990 Common Report Var(flag_unsafe_loop_optimizations) Optimization
1991 Allow loop optimizations to assume that the loops behave in normal way
1994 Common Report Var(flag_associative_math)
1995 Allow optimization for floating-point arithmetic which may change the
1996 result of the operation due to rounding.
1999 Common Report Var(flag_reciprocal_math)
2000 Same as -fassociative-math for expressions which include division.
2002 ; Nonzero means that unsafe floating-point math optimizations are allowed
2003 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2004 ; are allowed to assume that their arguments and results are "normal"
2005 ; (e.g., nonnegative for SQRT).
2006 funsafe-math-optimizations
2007 Common Report Var(flag_unsafe_math_optimizations) Optimization
2008 Allow math optimizations that may violate IEEE or ISO standards
2011 Common Report Var(flag_unswitch_loops) Optimization
2012 Perform loop unswitching
2015 Common Report Var(flag_unwind_tables) Optimization
2016 Just generate unwind tables for exception handling
2021 ; Positive if we should track variables, negative if we should run
2022 ; the var-tracking pass only to discard debug annotations, zero if
2023 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2024 ; will be set according to optimize, debug_info_level and debug_hooks
2025 ; in process_options ().
2027 Common Report Var(flag_var_tracking) Init(2) Optimization
2028 Perform variable tracking
2030 ; Positive if we should track variables at assignments, negative if
2031 ; we should run the var-tracking pass only to discard debug
2032 ; annotations. When flag_var_tracking_assignments ==
2033 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2034 fvar-tracking-assignments
2035 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2036 Perform variable tracking by annotating assignments
2038 ; Nonzero if we should toggle flag_var_tracking_assignments after
2039 ; processing options and computing its default. */
2040 fvar-tracking-assignments-toggle
2041 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2042 Toggle -fvar-tracking-assignments
2044 fvar-tracking-uninit
2045 Common Report Var(flag_var_tracking_uninit) Optimization
2046 Perform variable tracking and also tag variables that are uninitialized
2049 Common Report Var(flag_tree_vectorize) Optimization
2050 Enable loop vectorization on trees
2053 Common Report Var(flag_tree_slp_vectorize) Init(2) Optimization
2054 Enable basic block vectorization (SLP) on trees
2057 Common Report Var(flag_vect_cost_model) Optimization
2058 Enable use of cost model in vectorization
2060 ftree-vect-loop-version
2061 Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization
2062 Enable loop versioning when doing loop vectorization on trees
2064 ftree-vectorizer-verbose=
2065 Common RejectNegative Joined UInteger
2066 -ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
2069 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2070 Enable copy propagation of scalar-evolution information.
2072 ; -fverbose-asm causes extra commentary information to be produced in
2073 ; the generated assembly code (to make it more readable). This option
2074 ; is generally only of use to those who actually need to read the
2075 ; generated assembly code (perhaps while debugging the compiler itself).
2076 ; -fno-verbose-asm, the default, causes the extra information
2077 ; to not be added and is useful when comparing two assembler files.
2079 Common Report Var(flag_verbose_asm)
2080 Add extra commentary to assembler output
2083 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2084 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2087 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2090 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2093 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2096 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2099 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2102 Common Report Var(flag_value_profile_transformations) Optimization
2103 Use expression value profiles in optimizations
2106 Common Report Var(flag_web) Init(2) Optimization
2107 Construct webs and split unrelated uses of single variable
2109 ftree-builtin-call-dce
2110 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2111 Enable conditional dead code elimination for builtin calls
2114 Common Report Var(flag_whole_program) Init(0) Optimization
2115 Perform whole program optimizations
2118 Common Report Var(flag_wrapv) Optimization
2119 Assume signed arithmetic overflow wraps around
2121 fzero-initialized-in-bss
2122 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2123 Put zero initialized data in the bss section
2126 Common JoinedOrMissing
2127 Generate debug information in default format
2130 Common JoinedOrMissing Negative(gdwarf-)
2131 Generate debug information in COFF format
2134 Common Joined UInteger Var(dwarf_version) Init(2) Negative(gstabs)
2135 Generate debug information in DWARF v2 (or later) format
2138 Common JoinedOrMissing
2139 Generate debug information in default extended format
2142 Common JoinedOrMissing Negative(gstabs+)
2143 Generate debug information in STABS format
2146 Common JoinedOrMissing Negative(gvms)
2147 Generate debug information in extended STABS format
2150 Common RejectNegative Var(dwarf_strict,0) Init(-1)
2151 Emit DWARF additions beyond selected version
2154 Common Report RejectNegative Var(dwarf_strict,1)
2155 Don't emit DWARF additions beyond selected version
2158 Common Report Var(flag_gtoggle)
2159 Toggle debug information generation
2162 Common JoinedOrMissing Negative(gxcoff)
2163 Generate debug information in VMS format
2166 Common JoinedOrMissing Negative(gxcoff+)
2167 Generate debug information in XCOFF format
2170 Common JoinedOrMissing Negative(gcoff)
2171 Generate debug information in extended XCOFF format
2174 Driver Joined Separate
2177 Common Joined Var(plugindir_string) Init(0)
2178 -iplugindir=<dir> Set <dir> to be the default plugin directory
2181 Driver Joined Separate
2186 no-canonical-prefixes
2196 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2197 -o <file> Place output into <file>
2200 Common Var(profile_flag)
2201 Enable function profiling
2204 Driver Var(pass_exit_codes)
2207 Common Var(pedantic)
2208 Issue warnings needed for strict compliance to the standard
2211 Common Var(flag_pedantic_errors)
2212 Like -pedantic but issue them as errors
2218 Driver Var(use_pipes)
2221 Driver JoinedOrMissing Var(print_file_name)
2223 print-libgcc-file-name
2226 print-multi-directory
2227 Driver Var(print_multi_directory)
2230 Driver Var(print_multi_lib)
2232 print-multi-os-directory
2233 Driver Var(print_multi_os_directory)
2236 Driver JoinedOrMissing Var(print_prog_name)
2239 Driver Var(print_search_dirs)
2242 Driver Var(print_sysroot)
2244 print-sysroot-headers-suffix
2245 Driver Var(print_sysroot_headers_suffix)
2248 Common Var(quiet_flag) RejectDriver
2249 Do not display functions compiled or elapsed time
2267 Driver Var(report_times)
2270 Driver JoinedOrMissing
2273 Driver Joined Separate
2277 ; C option, but driver must not handle as "-u ndef".
2280 Common Driver Var(verbose_flag)
2281 Enable verbose output
2284 Common Var(version_flag) RejectDriver
2285 Display the compiler's version
2288 Common Var(inhibit_warnings)
2292 Driver Separate Var(wrapper_string)
2295 Driver Joined Separate
2298 Common RejectNegative Negative(pie)
2299 Create a shared library
2305 Driver Separate Alias(specs=)
2318 ; Documented for Fortran, but always accepted by driver.
2325 ; Documented for Go, but always accepted by driver.
2331 Common RejectNegative Negative(shared)
2332 Create a position independent executable
2335 Driver Joined Separate
2337 ; This comment is to ensure we retain the blank line above.