1 ; Options for the language- and target-independent parts of the compiler.
3 ; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 ; Free Software Foundation, Inc.
6 ; This file is part of GCC.
8 ; GCC is free software; you can redistribute it and/or modify it under
9 ; the terms of the GNU General Public License as published by the Free
10 ; Software Foundation; either version 3, or (at your option) any later
13 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 ; You should have received a copy of the GNU General Public License
19 ; along with GCC; see the file COPYING3. If not see
20 ; <http://www.gnu.org/licenses/>.
22 ; See the GCC internals manual (options.texi) for a description of this file's format.
24 ; Please try to keep this file in ASCII collating order.
35 ; Not used directly to control optimizations, only to save -Ofast
36 ; setting for "optimize" attributes.
40 ; 0 means straightforward implementation of complex divide acceptable.
41 ; 1 means wide ranges of inputs must work for complex divide.
42 ; 2 means C99-like requirements for complex multiply and divide.
44 int flag_complex_method = 1
46 ; Nonzero if subexpressions must be evaluated from left-to-right.
48 int flag_evaluation_order = 0
50 ; Language specific warning pass for unused results.
52 bool flag_warn_unused_result = false
57 ; Nonzero if we should write GIMPLE bytecode for link-time optimization.
61 ; True to warn about any objects definitions whose size is larger
62 ; than N bytes. Also want about function definitions whose returned
63 ; values are larger than N bytes, where N is 'larger_than_size'.
68 HOST_WIDE_INT larger_than_size
70 ; True to warn about any function whose frame size is larger
73 bool warn_frame_larger_than
76 HOST_WIDE_INT frame_larger_than_size
78 ; Nonzero means we should be saving declaration info into a .X file.
80 int flag_gen_aux_info = 0
82 ; Nonzero if we are compiling code for a shared library, zero for
87 ; These two are really VEC(char_p,heap) *.
90 void *flag_instrument_functions_exclude_functions
93 void *flag_instrument_functions_exclude_files
95 ; Generic structs (e.g. templates not explicitly specialized)
96 ; may not have a compilation unit associated with them, and so
97 ; may need to be treated differently from ordinary structs.
99 ; Structs only handled by reference (indirectly), will also usually
100 ; not need as much debugging information.
103 enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
106 enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
108 ; True if we should exit after parsing options.
110 bool exit_after_options
112 ; Type(s) of debugging information we are producing (if any). See
113 ; flag-types.h for the definitions of the different possible types of
114 ; debugging information.
116 enum debug_info_type write_symbols = NO_DEBUG
118 ; Level of debugging information we are producing. See flag-types.h
119 ; for the definitions of the different possible levels.
121 enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
123 ; Nonzero means use GNU-only extensions in the generated symbolic
124 ; debugging information. Currently, this only has an effect when
125 ; write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG.
127 bool use_gnu_debug_info_extensions
129 ; Original value of maximum field alignment in bytes, specified via
130 ; -fpack-struct=<value>.
132 unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
135 enum vect_verbosity_levels user_vect_verbosity_level = MAX_VERBOSITY_LEVEL
137 ; Type of stack check.
139 enum stack_check_type flag_stack_check = NO_STACK_CHECK
141 ; -dA causes debug commentary information to be produced in
142 ; the generated assembly code (to make it more readable). This option
143 ; is generally only of use to those who actually need to read the
144 ; generated assembly code (perhaps while debugging the compiler itself).
145 ; Currently, this switch is only used by dwarf2out.c; however, it is intended
146 ; to be a catchall for printing debug information in the assembler file.
150 ; -dP causes the rtl to be emitted as a comment in assembly.
152 int flag_dump_rtl_in_asm
154 ; Whether -da was passed (used only in handle_common_deferred_options).
156 bool flag_dump_all_passed
158 ; Other flags saying which kinds of debugging dump have been requested.
161 int rtl_dump_and_exit
164 int flag_print_asm_name
167 enum graph_dump_types graph_dump_format = no_graph
169 ; Name of top-level original source file (what was input to cpp).
170 ; This comes from the #-command at the beginning of the actual input.
171 ; If there isn't any there, then this is the cc1 input file name.
173 const char *main_input_filename
175 ; Pointer to base name in main_input_filename, with directories and a
176 ; single final extension removed, and the length of this base
180 const char *main_input_basename
183 int main_input_baselength
185 ; Which options have been printed by --help.
189 ; Which enums have been printed by --help. 0 = not printed, no
190 ; relevant options seen, 1 = relevant option seen, not yet printed, 2
193 char *help_enum_printed
195 ; The number of columns for --help output.
197 unsigned int help_columns
199 ; Whether this options structure has been through finish_options
201 bool flag_opts_finished
213 Driver Alias(coverage)
219 Common Separate Alias(d)
222 Common Joined Alias(d)
225 Common Separate Alias(dumpbase)
228 Common Separate Alias(dumpdir)
231 Driver Separate Alias(e)
234 Driver Joined Alias(e)
237 Common Warning Alias(Wextra)
240 Driver Separate Alias(Xassembler)
243 Driver JoinedOrMissing Alias(Xassembler)
246 Driver Separate Alias(Xlinker)
249 Driver JoinedOrMissing Alias(Xlinker)
252 Driver Separate Alias(u)
255 Driver Joined Alias(u)
258 Common Driver Var(help_flag)
259 Display this information
262 Common Driver Report Joined
263 --help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params
266 Driver Separate Alias(x)
269 Driver Joined Alias(x)
272 Driver Separate Alias(L)
275 Driver Joined Alias(L)
277 -no-canonical-prefixes
278 Driver Alias(no-canonical-prefixes)
280 -no-standard-libraries
281 Driver Alias(nostdlib)
290 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
293 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
296 Driver Alias(pass-exit-codes)
299 Common Alias(pedantic)
302 Common Alias(pedantic-errors)
311 Driver Separate Alias(B)
314 Driver JoinedOrMissing Alias(B)
320 Driver Separate Alias(print-file-name=)
323 Driver JoinedOrMissing Alias(print-file-name=)
325 -print-libgcc-file-name
326 Driver Alias(print-libgcc-file-name)
328 -print-multi-directory
329 Driver Alias(print-multi-directory)
332 Driver Alias(print-multi-lib)
334 -print-multi-os-directory
335 Driver Alias(print-multi-os-directory)
338 Driver Separate Alias(print-prog-name=)
341 Driver JoinedOrMissing Alias(print-prog-name=)
344 Driver Alias(print-search-dirs)
347 Driver Alias(print-sysroot)
349 -print-sysroot-headers-suffix
350 Driver Alias(print-sysroot-headers-suffix)
356 Driver Alias(save-temps)
362 Driver Separate Alias(specs=)
365 Driver Joined Alias(specs=)
371 Driver Alias(symbolic)
375 Alias for --help=target
383 ;; The driver used to convert options such as --help into forms such
384 ;; as -fhelp; the following four entries are for compatibility with
385 ;; any direct uses of those (undocumented) -f forms
387 Common Driver Alias(-help)
390 Common Driver Joined Alias(-help=)
393 Common Driver Alias(-target-help)
396 Common Driver Alias(-version)
400 --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
403 Common Joined Alias(-param)
406 Driver Separate Alias(-sysroot=)
409 Driver JoinedOrMissing
415 Driver Joined Separate
421 Driver Joined Separate
427 Common JoinedOrMissing Optimization
428 -O<number> Set optimization level to <number>
432 Optimize for space rather than speed
436 Optimize for speed disregarding exact standards compliance
448 Driver Joined Separate
454 Driver Joined Separate
475 Common RejectNegative Warning Alias(Wextra)
476 This switch is deprecated; use -Wextra instead
479 Driver JoinedOrMissing
482 Driver JoinedOrMissing
485 Driver JoinedOrMissing
488 Common Var(warn_aggregate_return) Warning
489 Warn about returning structures, unions or arrays
492 Common Var(warn_array_bounds) Warning
493 Warn if an array is accessed out of bounds
496 Common Var(warn_attributes) Init(1) Warning
497 Warn about inappropriate attribute usage
500 Common Var(warn_cast_align) Warning
501 Warn about pointer casts which increase alignment
504 Common Var(warn_cpp) Init(1) Warning
505 Warn when a #warning directive is encountered
507 Wdeprecated-declarations
508 Common Var(warn_deprecated_decl) Init(1) Warning
509 Warn about uses of __attribute__((deprecated)) declarations
511 Wdisabled-optimization
512 Common Var(warn_disabled_optimization) Warning
513 Warn when an optimization pass is disabled
516 Common Var(warnings_are_errors)
517 Treat all warnings as errors
521 Treat specified warning as error
524 Common Var(extra_warnings) Warning
525 Print extra (possibly unwanted) warnings
528 Common Var(flag_fatal_errors)
529 Exit on the first error occurred
532 Common RejectNegative Joined UInteger
533 -Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
536 Common Var(warn_inline) Warning
537 Warn when an inlined function cannot be inlined
540 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
543 Common RejectNegative Joined UInteger Warning
544 -Wlarger-than=<number> Warn if an object is larger than <number> bytes
546 Wunsafe-loop-optimizations
547 Common Var(warn_unsafe_loop_optimizations) Warning
548 Warn if the loop cannot be optimized due to nontrivial assumptions.
551 Common Var(warn_missing_noreturn) Warning
552 Warn about functions which might be candidates for __attribute__((noreturn))
555 Common Var(warn_mudflap) Init(1) Warning
556 Warn about constructs not instrumented by -fmudflap
559 Common Var(warn_overflow) Init(1) Warning
560 Warn about overflow in arithmetic expressions
563 Common Var(warn_packed) Warning
564 Warn when the packed attribute has no effect on struct layout
567 Common Var(warn_padded) Warning
568 Warn when padding is required to align structure members
571 Common Var(warn_shadow) Warning
572 Warn when one local variable shadows another
575 Common Var(warn_stack_protect) Warning
576 Warn when not issuing stack smashing protection for some reason
580 Warn about code which might break strict aliasing rules
583 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Init(-1) Warning
584 Warn about code which might break strict aliasing rules
588 Warn about optimizations that assume that signed overflow is undefined
591 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Init(-1) Warning
592 Warn about optimizations that assume that signed overflow is undefined
594 Wsuggest-attribute=const
595 Common Var(warn_suggest_attribute_const) Warning
596 Warn about functions which might be candidates for __attribute__((const))
598 Wsuggest-attribute=pure
599 Common Var(warn_suggest_attribute_pure) Warning
600 Warn about functions which might be candidates for __attribute__((pure))
602 Wsuggest-attribute=noreturn
603 Common Var(warn_suggest_attribute_noreturn) Warning
604 Warn about functions which might be candidates for __attribute__((noreturn))
607 Common Var(warn_switch) Warning
608 Warn about enumerated switches, with no default, missing a case
611 Common Var(warn_switch_default) Warning
612 Warn about enumerated switches missing a \"default:\" statement
615 Common Var(warn_switch_enum) Warning
616 Warn about all enumerated switches missing a specific case
619 Common Var(warn_system_headers) Warning
620 Do not suppress warnings from system headers
623 Common Var(warn_trampolines) Warning
624 Warn whenever a trampoline is generated
627 Common Var(warn_type_limits) Init(-1) Warning
628 Warn if a comparison is always true or always false due to the limited range of the data type
631 Common Var(warn_uninitialized) Init(-1) Warning
632 Warn about uninitialized automatic variables
635 Common Var(warn_maybe_uninitialized) Warning
636 Warn about maybe uninitialized automatic variables
640 Does nothing. Preserved for backward compatibility.
643 Common Var(warn_unused) Init(0) Warning
644 Enable all -Wunused- warnings
646 Wunused-but-set-parameter
647 Common Var(warn_unused_but_set_parameter) Init(-1) Warning
648 Warn when a function parameter is only set, otherwise unused
650 Wunused-but-set-variable
651 Common Var(warn_unused_but_set_variable) Init(-1) Warning
652 Warn when a variable is only set, otherwise unused
655 Common Var(warn_unused_function) Init(-1) Warning
656 Warn when a function is unused
659 Common Var(warn_unused_label) Init(-1) Warning
660 Warn when a label is unused
663 Common Var(warn_unused_parameter) Init(-1) Warning
664 Warn when a function parameter is unused
667 Common Var(warn_unused_value) Init(-1) Warning
668 Warn when an expression value is unused
671 Common Var(warn_unused_variable) Init(-1) Warning
672 Warn when a variable is unused
675 Common Var(warn_coverage_mismatch) Init(1) Warning
676 Warn in case profiles in -fprofile-use do not match
691 Common Separate Var(aux_info_file_name)
692 -aux-info <file> Emit declaration information into <file>
695 Common Joined Alias(aux-info)
698 Common Separate RejectDriver Var(aux_base_name)
701 Common Separate RejectDriver
711 -d<letters> Enable dumps from specific passes of the compiler
714 Common Separate Var(dump_base_name)
715 -dumpbase <file> Set the file basename to be used for dumps
718 Common Separate Var(dump_dir_name)
719 -dumpdir <dir> Set the directory name to be used for dumps
731 Driver Joined Separate
733 ; This option has historically been passed down to the linker by an
734 ; accident of a %{e*} spec, so ensure it continues to be passed down
735 ; as a single option. The supported option for this purpose is
736 ; -rdynamic. See PR 47390.
740 ; The version of the C++ ABI in use. The following values are allowed:
742 ; 0: The version of the ABI believed most conformant with the C++ ABI
743 ; specification. This ABI may change as bugs are discovered and fixed.
744 ; Therefore, 0 will not necessarily indicate the same ABI in different
747 ; 1: The version of the ABI first used in G++ 3.2.
749 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
751 ; 3: The version of the ABI that fixes the missing underscore
752 ; in template non-type arguments of pointer type.
754 ; 4: The version of the ABI that introduces unambiguous mangling of
755 ; vector types. First selectable in G++ 4.5.
757 ; 5: The version of the ABI that ignores attribute const/noreturn
758 ; in function pointer mangling, and corrects mangling of decltype and
759 ; function parameters used in other parameters and the return type.
760 ; First selectable in G++ 4.6.
762 ; 6: The version of the ABI that doesn't promote scoped enums to int.
763 ; First selectable in G++ 4.7.
765 ; Additional positive integers will be assigned as new versions of
766 ; the ABI become the default version of the ABI.
768 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(2)
771 Common Report Var(align_functions,0) Optimization UInteger
772 Align the start of functions
775 Common RejectNegative Joined UInteger Var(align_functions)
778 Common Report Var(align_jumps,0) Optimization UInteger
779 Align labels which are only reached by jumping
782 Common RejectNegative Joined UInteger Var(align_jumps)
785 Common Report Var(align_labels,0) Optimization UInteger
789 Common RejectNegative Joined UInteger Var(align_labels)
792 Common Report Var(align_loops,0) Optimization UInteger
793 Align the start of loops
796 Common RejectNegative Joined UInteger Var(align_loops)
800 Does nothing. Preserved for backward compatibility.
804 Does nothing. Preserved for backward compatibility.
806 fargument-noalias-global
808 Does nothing. Preserved for backward compatibility.
810 fargument-noalias-anything
812 Does nothing. Preserved for backward compatibility.
814 fasynchronous-unwind-tables
815 Common Report Var(flag_asynchronous_unwind_tables) Optimization
816 Generate unwind tables that are exact at each instruction boundary
819 Common Report Var(flag_auto_inc_dec) Init(1)
820 Generate auto-inc/dec instructions
822 ; -fcheck-bounds causes gcc to generate array bounds checks.
823 ; For C, C++ and ObjC: defaults off.
824 ; For Java: defaults to on.
825 ; For Fortran: defaults to off.
827 Common Report Var(flag_bounds_check)
828 Generate code to check bounds before indexing arrays
831 Common Report Var(flag_branch_on_count_reg) Init(1) Optimization
832 Replace add, compare, branch with branch on count register
834 fbranch-probabilities
835 Common Report Var(flag_branch_probabilities) Optimization
836 Use profiling information for branch probabilities
838 fbranch-target-load-optimize
839 Common Report Var(flag_branch_target_load_optimize) Optimization
840 Perform branch target load optimization before prologue / epilogue threading
842 fbranch-target-load-optimize2
843 Common Report Var(flag_branch_target_load_optimize2) Optimization
844 Perform branch target load optimization after prologue / epilogue threading
847 Common Report Var(flag_btr_bb_exclusive) Optimization
848 Restrict target load migration not to re-use registers in any basic block
851 Common Joined RejectNegative Var(common_deferred_options) Defer
852 -fcall-saved-<register> Mark <register> as being preserved across functions
855 Common Joined RejectNegative Var(common_deferred_options) Defer
856 -fcall-used-<register> Mark <register> as being corrupted by function calls
858 ; Nonzero for -fcaller-saves: allocate values in regs that need to
859 ; be saved across function calls, if that produces overall better code.
860 ; Optional now, so people can test it.
862 Common Report Var(flag_caller_saves) Optimization
863 Save registers around function calls
866 Common Report Var(flag_check_data_deps)
867 Compare the results of several data dependence analyzers.
869 fcombine-stack-adjustments
870 Common Report Var(flag_combine_stack_adjustments) Optimization
871 Looks for opportunities to reduce stack adjustments and stack references.
874 Common Report Var(flag_no_common,0) Optimization
875 Do not put uninitialized globals in the common section
879 ; Converted by the driver to -fcompare-debug= options.
882 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
883 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
885 fcompare-debug-second
886 Common Driver RejectNegative Var(flag_compare_debug)
887 Run only the second compilation of -fcompare-debug
890 Common Report Var(flag_compare_elim_after_reload) Optimization
891 Perform comparison elimination after register allocation has finished
894 Common Var(flag_conserve_stack) Optimization
895 Do not perform optimizations increasing noticeably stack usage
898 Common Report Var(flag_cprop_registers) Optimization
899 Perform a register copy-propagation optimization pass
902 Common Report Var(flag_crossjumping) Optimization
903 Perform cross-jumping optimization
906 Common Report Var(flag_cse_follow_jumps) Optimization
907 When running CSE, follow jumps to their targets
911 Does nothing. Preserved for backward compatibility.
914 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
915 Omit range reduction step when performing complex division
918 Common Report Var(flag_cx_fortran_rules) Optimization
919 Complex multiplication and division follow Fortran rules
922 Common Report Var(flag_data_sections) Optimization
923 Place data items into their own section
926 Common Report Var(common_deferred_options) Defer
927 List all available debugging counters with their limits and counts.
930 Common RejectNegative Joined Var(common_deferred_options) Defer
931 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
934 Common Joined RejectNegative Var(common_deferred_options) Defer
935 Map one directory name to another in debug information
938 Common Report Var(flag_debug_types_section) Init(1)
939 Output .debug_types section when using DWARF v4 debuginfo.
941 ; Nonzero for -fdefer-pop: don't pop args after each function call
942 ; instead save them up to pop many calls' args with one insns.
944 Common Report Var(flag_defer_pop) Optimization
945 Defer popping functions args from stack until later
948 Common Report Var(flag_delayed_branch) Optimization
949 Attempt to fill delay slots of branch instructions
951 fdelete-null-pointer-checks
952 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
953 Delete useless null pointer checks
956 Common Report Var(flag_devirtualize) Optimization
957 Try to convert virtual calls to direct ones.
959 fdiagnostics-show-location=
960 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
961 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
963 ; Required for these enum values.
968 Name(diagnostic_prefixing_rule) Type(int)
971 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
974 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
976 fdiagnostics-show-option
977 Common Var(flag_diagnostics_show_option) Init(1)
978 Amend appropriate diagnostic messages with the command line option that controls them
981 Common Joined RejectNegative Var(common_deferred_options) Defer
982 -fdump-<type> Dump various compiler internals to a file
985 Driver RejectNegative
988 Common RejectNegative Joined Var(flag_dump_final_insns)
989 -fdump-final-insns=filename Dump to filename the insns at the end of translation
992 Common RejectNegative Joined Var(flag_dump_go_spec)
993 -fdump-go-spec=filename Write all declarations to file as Go code
996 Common Report Var(flag_dump_noaddr)
997 Suppress output of addresses in debugging dumps
1000 Common Report Var(flag_dump_unnumbered)
1001 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1003 fdump-unnumbered-links
1004 Common Report Var(flag_dump_unnumbered_links)
1005 Suppress output of previous and next insn numbers in debugging dumps
1008 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1009 Enable CFI tables via GAS assembler directives.
1012 Common Report Var(flag_early_inlining) Init(1) Optimization
1013 Perform early inlining
1015 feliminate-dwarf2-dups
1016 Common Report Var(flag_eliminate_dwarf2_dups)
1017 Perform DWARF2 duplicate elimination
1020 Common Report Var(flag_ipa_sra) Init(0) Optimization
1021 Perform interprocedural reduction of aggregates
1023 feliminate-unused-debug-symbols
1024 Common Report Var(flag_debug_only_used_symbols)
1025 Perform unused type elimination in debug info
1027 feliminate-unused-debug-types
1028 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1029 Perform unused type elimination in debug info
1031 femit-class-debug-always
1032 Common Report Var(flag_emit_class_debug_always) Init(0)
1033 Do not suppress C++ class debug information.
1036 Common Report Var(flag_exceptions) Optimization
1037 Enable exception handling
1039 fexpensive-optimizations
1040 Common Report Var(flag_expensive_optimizations) Optimization
1041 Perform a number of minor, expensive optimizations
1044 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1045 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1048 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1051 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1054 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1060 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1061 Assume no NaNs or infinities are generated
1064 Common Joined RejectNegative Var(common_deferred_options) Defer
1065 -ffixed-<register> Mark <register> as being unavailable to the compiler
1068 Common Report Var(flag_float_store) Optimization
1069 Don't allocate floats and doubles in extended-precision registers
1073 Does nothing. Preserved for backward compatibility.
1076 Common Report Var(flag_forward_propagate) Optimization
1077 Perform a forward propagation pass on RTL
1080 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1081 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1084 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1087 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1089 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1091 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1094 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1096 ; Nonzero means don't put addresses of constant functions in registers.
1097 ; Used for compiling the Unix kernel, where strange substitutions are
1098 ; done on the assembly output.
1100 Common Report Var(flag_no_function_cse,0)
1101 Allow function addresses to be held in registers
1104 Common Report Var(flag_function_sections)
1105 Place each function into its own section
1108 Common Report Var(flag_gcse) Optimization
1109 Perform global common subexpression elimination
1112 Common Report Var(flag_gcse_lm) Init(1) Optimization
1113 Perform enhanced load motion during global common subexpression elimination
1116 Common Report Var(flag_gcse_sm) Init(0) Optimization
1117 Perform store motion after global common subexpression elimination
1120 Common Report Var(flag_gcse_las) Init(0) Optimization
1121 Perform redundant load after store elimination in global common subexpression
1125 Common Report Var(flag_gcse_after_reload) Optimization
1126 Perform global common subexpression elimination after register allocation
1129 ; This option is not documented yet as its semantics will change.
1131 Common Report Var(flag_graphite)
1132 Enable in and out of Graphite representation
1135 Common Report Var(flag_graphite_identity) Optimization
1136 Enable Graphite Identity transformation
1138 floop-parallelize-all
1139 Common Report Var(flag_loop_parallelize_all) Optimization
1140 Mark all loops as parallel
1143 Common Report Var(flag_loop_strip_mine) Optimization
1144 Enable Loop Strip Mining transformation
1147 Common Report Var(flag_loop_interchange) Optimization
1148 Enable Loop Interchange transformation
1151 Common Report Var(flag_loop_block) Optimization
1152 Enable Loop Blocking transformation
1155 Common Report Var(flag_loop_flatten) Optimization
1156 Enable Loop Flattening transformation
1158 fstrict-volatile-bitfields
1159 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1160 Force bitfield accesses to match their type width
1162 fguess-branch-probability
1163 Common Report Var(flag_guess_branch_prob) Optimization
1164 Enable guessing of branch probabilities
1166 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1167 ; Generate position-independent code for executables if possible
1168 ; On SVR4 targets, it also controls whether or not to emit a
1169 ; string identifying the compiler.
1171 Common Report Var(flag_no_ident,0)
1172 Process #ident directives
1175 Common Report Var(flag_if_conversion) Optimization
1176 Perform conversion of conditional jumps to branchless equivalents
1179 Common Report Var(flag_if_conversion2) Optimization
1180 Perform conversion of conditional jumps to conditional execution
1182 ftree-loop-if-convert
1183 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1184 Convert conditional jumps in innermost loops to branchless equivalents
1186 ftree-loop-if-convert-stores
1187 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1188 Also if-convert conditional jumps containing memory writes
1190 ; -finhibit-size-directive inhibits output of .size for ELF.
1191 ; This is used only for compiling crtstuff.c,
1192 ; and it may be extended to other effects
1193 ; needed for crtstuff.c on other systems.
1194 finhibit-size-directive
1195 Common Report Var(flag_inhibit_size_directive)
1196 Do not generate .size directives
1199 Common Report Var(flag_indirect_inlining)
1200 Perform indirect inlining
1202 ; Nonzero means that functions declared `inline' will be treated
1203 ; as `static'. Prevents generation of zillions of copies of unused
1204 ; static inline functions; instead, `inlines' are written out
1205 ; only when actually used. Used in conjunction with -g. Also
1206 ; does the right thing with #pragma interface.
1208 Common Report Var(flag_no_inline,0) Init(0)
1209 Pay attention to the \"inline\" keyword
1211 finline-small-functions
1212 Common Report Var(flag_inline_small_functions) Optimization
1213 Integrate simple functions into their callers when code size is known to not growth
1216 Common Report Var(flag_inline_functions) Optimization
1217 Integrate simple functions into their callers
1219 finline-functions-called-once
1220 Common Report Var(flag_inline_functions_called_once) Init(1) Optimization
1221 Integrate functions called once into their callers
1224 Common RejectNegative Joined Alias(finline-limit=)
1227 Common RejectNegative Joined UInteger
1228 -finline-limit=<number> Limit the size of inlined functions to <number>
1230 finstrument-functions
1231 Common Report Var(flag_instrument_function_entry_exit)
1232 Instrument function entry and exit with profiling calls
1234 finstrument-functions-exclude-function-list=
1235 Common RejectNegative Joined
1236 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1238 finstrument-functions-exclude-file-list=
1239 Common RejectNegative Joined
1240 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1243 Common Report Var(flag_ipa_cp) Optimization
1244 Perform Interprocedural constant propagation
1247 Common Report Var(flag_ipa_cp_clone) Optimization
1248 Perform cloning to make Interprocedural constant propagation stronger
1251 Common Report Var(flag_ipa_profile) Init(0) Optimization
1252 Perform interprocedural profile propagation
1255 Common Report Var(flag_ipa_pta) Init(0) Optimization
1256 Perform interprocedural points-to analysis
1259 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1260 Discover pure and const functions
1263 Common Report Var(flag_ipa_reference) Init(0) Optimization
1264 Discover readonly and non addressable static variables
1267 Common Report Var(flag_ipa_matrix_reorg) Optimization
1268 Perform matrix layout flattening and transposing based
1269 on profiling information.
1273 Does nothing. Preserved for backward compatibility.
1276 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1277 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1280 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1283 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1286 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1289 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_MIXED)
1290 -fira-region=[one|all|mixed] Set regions for IRA
1293 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1296 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1299 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1302 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1305 Common Report Var(flag_ira_loop_pressure)
1306 Use IRA based register pressure calculation
1307 in RTL loop optimizations.
1309 fira-share-save-slots
1310 Common Report Var(flag_ira_share_save_slots) Init(1)
1311 Share slots for saving different hard registers.
1313 fira-share-spill-slots
1314 Common Report Var(flag_ira_share_spill_slots) Init(1)
1315 Share stack slots for spilled pseudo-registers.
1318 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1319 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1322 Common Report Var(flag_ivopts) Init(1) Optimization
1323 Optimize induction variables on trees
1326 Common Var(flag_jump_tables) Init(1) Optimization
1327 Use jump tables for sufficiently large switch statements
1329 fkeep-inline-functions
1330 Common Report Var(flag_keep_inline_functions)
1331 Generate code for functions even if they are fully inlined
1334 Common Report Var(flag_keep_static_consts) Init(1)
1335 Emit static const variables even if they are not used
1338 Common Report Var(flag_leading_underscore) Init(-1)
1339 Give external symbols a leading underscore
1343 Does nothing. Preserved for backward compatibility.
1347 Enable link-time optimization.
1350 Common RejectNegative Joined Var(flag_lto)
1351 Link-time optimization with number of parallel jobs or jobserver.
1354 Common Var(flag_lto_partition_1to1)
1355 Partition functions and vars at linktime based on object files they originate from
1357 flto-partition=balanced
1358 Common Var(flag_lto_partition_balanced)
1359 Partition functions and vars at linktime into approximately same sized buckets
1362 Common Var(flag_lto_partition_none)
1363 Disable partioning and streaming
1365 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1366 flto-compression-level=
1367 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1368 -flto-compression-level=<number> Use zlib compression level <number> for IL
1371 Common Report Var(flag_lto_report) Init(0) Optimization
1372 Report various link-time optimization statistics
1375 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1376 Set errno after built-in math functions
1379 Common Joined RejectNegative UInteger Var(flag_max_errors)
1380 -fmax-errors=<number> Maximum number of errors to report
1383 Common Report Var(mem_report)
1384 Report on permanent memory allocation
1386 ; This will attempt to merge constant section constants, if 1 only
1387 ; string constants and constants from constant pool, if 2 also constant
1389 fmerge-all-constants
1390 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1391 Attempt to merge identical constants and constant variables
1394 Common Report Var(flag_merge_constants,1) Optimization
1395 Attempt to merge identical constants across compilation units
1397 fmerge-debug-strings
1398 Common Report Var(flag_merge_debug_strings) Init(1)
1399 Attempt to merge identical debug strings across compilation units
1402 Common RejectNegative Joined UInteger
1403 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1406 Common Report Var(flag_modulo_sched) Optimization
1407 Perform SMS based modulo scheduling before the first scheduling pass
1409 fmodulo-sched-allow-regmoves
1410 Common Report Var(flag_modulo_sched_allow_regmoves)
1411 Perform SMS based modulo scheduling with register moves allowed
1413 fmove-loop-invariants
1414 Common Report Var(flag_move_loop_invariants) Init(1) Optimization
1415 Move loop invariant computations out of loops
1418 Common RejectNegative Report Var(flag_mudflap)
1419 Add mudflap bounds-checking instrumentation for single-threaded program
1422 Common RejectNegative Report Var(flag_mudflap,2)
1423 Add mudflap bounds-checking instrumentation for multi-threaded program
1426 Common RejectNegative Report Var(flag_mudflap_ignore_reads)
1427 Ignore read operations when inserting mudflap instrumentation
1430 Common Var(flag_dce) Init(1) Optimization
1431 Use the RTL dead code elimination pass
1434 Common Var(flag_dse) Init(1) Optimization
1435 Use the RTL dead store elimination pass
1437 freschedule-modulo-scheduled-loops
1438 Common Report Var(flag_resched_modulo_sched) Optimization
1439 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1441 fnon-call-exceptions
1442 Common Report Var(flag_non_call_exceptions) Optimization
1443 Support synchronous non-call exceptions
1446 Common Report Var(flag_omit_frame_pointer) Optimization
1447 When possible do not generate stack frames
1449 foptimize-register-move
1450 Common Report Var(flag_regmove) Optimization
1451 Do the full register move optimization pass
1453 foptimize-sibling-calls
1454 Common Report Var(flag_optimize_sibling_calls) Optimization
1455 Optimize sibling and tail recursive calls
1458 Common Report Var(flag_partial_inlining)
1459 Perform partial inlining
1462 Common Report Var(pre_ipa_mem_report)
1463 Report on memory allocation before interprocedural optimization
1465 fpost-ipa-mem-report
1466 Common Report Var(post_ipa_mem_report)
1467 Report on memory allocation before interprocedural optimization
1470 Common Report Var(flag_pack_struct) Optimization
1471 Pack structure members together without holes
1474 Common RejectNegative Joined UInteger Optimization
1475 -fpack-struct=<number> Set initial maximum structure member alignment
1478 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1479 Return small aggregates in memory, not registers
1482 Common Report Var(flag_peel_loops) Optimization
1483 Perform loop peeling
1486 Common Report Var(flag_no_peephole,0) Optimization
1487 Enable machine specific peephole optimizations
1490 Common Report Var(flag_peephole2) Optimization
1491 Enable an RTL peephole pass before sched2
1494 Common Report Var(flag_pic,2)
1495 Generate position-independent code if possible (large mode)
1498 Common Report Var(flag_pie,2)
1499 Generate position-independent code for executables if possible (large mode)
1502 Common Report Var(flag_pic,1)
1503 Generate position-independent code if possible (small mode)
1506 Common Report Var(flag_pie,1)
1507 Generate position-independent code for executables if possible (small mode)
1510 Common Joined RejectNegative Var(common_deferred_options) Defer
1511 Specify a plugin to load
1514 Common Joined RejectNegative Var(common_deferred_options) Defer
1515 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1517 fpredictive-commoning
1518 Common Report Var(flag_predictive_commoning) Optimization
1519 Run predictive commoning optimization.
1521 fprefetch-loop-arrays
1522 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1523 Generate prefetch instructions, if available, for arrays in loops
1526 Common Report Var(profile_flag)
1527 Enable basic program profiling code
1530 Common Report Var(profile_arc_flag)
1531 Insert arc-based program profiling code
1534 Common Joined RejectNegative Var(profile_data_prefix)
1535 Set the top-level directory for storing the profile data.
1536 The default is 'pwd'.
1539 Common Report Var(flag_profile_correction)
1540 Enable correction of flow inconsistent profile data input
1544 Enable common options for generating profile info for profile feedback directed optimizations
1547 Common Joined RejectNegative
1548 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1551 Common Var(flag_profile_use)
1552 Enable common options for performing profile feedback directed optimizations
1555 Common Joined RejectNegative
1556 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1559 Common Report Var(flag_profile_values)
1560 Insert code to profile values of expressions
1563 Common Var(common_deferred_options) Defer
1566 Common Joined RejectNegative Var(common_deferred_options) Defer
1567 -frandom-seed=<string> Make compile reproducible using <string>
1569 ; This switch causes the command line that was used to create an
1570 ; object file to be recorded into the object file. The exact format
1571 ; of this recording is target and binary file format dependent.
1572 ; It is related to the -fverbose-asm switch, but that switch only
1573 ; records information in the assembler output file as comments, so
1574 ; they never reach the object file.
1575 frecord-gcc-switches
1576 Common Report Var(flag_record_gcc_switches)
1577 Record gcc command line switches in the object file.
1580 Common Report Var(flag_pcc_struct_return,0) Optimization
1581 Return small aggregates in registers
1584 Common Report Var(flag_regmove) Optimization
1585 Enables a register move optimization
1588 Common Report Var(flag_rename_registers) Init(2) Optimization
1589 Perform a register renaming optimization pass
1592 Common Report Var(flag_reorder_blocks) Optimization
1593 Reorder basic blocks to improve code placement
1595 freorder-blocks-and-partition
1596 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1597 Reorder basic blocks and partition into hot and cold sections
1600 Common Report Var(flag_reorder_functions) Optimization
1601 Reorder functions to improve code placement
1603 frerun-cse-after-loop
1604 Common Report Var(flag_rerun_cse_after_loop) Optimization
1605 Add a common subexpression elimination pass after loop optimizations
1609 Does nothing. Preserved for backward compatibility.
1612 Common Report Var(flag_rounding_math) Optimization SetByCombined
1613 Disable optimizations that assume default FP rounding behavior
1616 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1617 Enable scheduling across basic blocks
1620 Common Report Var(flag_sched_pressure) Init(0) Optimization
1621 Enable register pressure sensitive insn scheduling
1624 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1625 Allow speculative motion of non-loads
1628 Common Report Var(flag_schedule_speculative_load) Optimization
1629 Allow speculative motion of some loads
1631 fsched-spec-load-dangerous
1632 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1633 Allow speculative motion of more loads
1636 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1637 -fsched-verbose=<number> Set the verbosity level of the scheduler
1639 fsched2-use-superblocks
1640 Common Report Var(flag_sched2_use_superblocks) Optimization
1641 If scheduling post reload, do superblock scheduling
1645 Does nothing. Preserved for backward compatibility.
1648 Common Report Var(flag_schedule_insns) Optimization
1649 Reschedule instructions before register allocation
1652 Common Report Var(flag_schedule_insns_after_reload) Optimization
1653 Reschedule instructions after register allocation
1655 ; This flag should be on when a target implements non-trivial
1656 ; scheduling hooks, maybe saving some information for its own sake.
1657 ; On IA64, for example, this is used for correct bundling.
1658 fselective-scheduling
1659 Common Report Var(flag_selective_scheduling) Optimization
1660 Schedule instructions using selective scheduling algorithm
1662 fselective-scheduling2
1663 Common Report Var(flag_selective_scheduling2) Optimization
1664 Run selective scheduling after reload
1666 fsel-sched-pipelining
1667 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1668 Perform software pipelining of inner loops during selective scheduling
1670 fsel-sched-pipelining-outer-loops
1671 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1672 Perform software pipelining of outer loops during selective scheduling
1674 fsel-sched-reschedule-pipelined
1675 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1676 Reschedule pipelined regions without pipelining
1678 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1679 ; of stalled insns into the ready list.
1680 fsched-stalled-insns
1681 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1682 Allow premature scheduling of queued insns
1684 fsched-stalled-insns=
1685 Common RejectNegative Joined UInteger
1686 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1688 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1689 ; be examined for a dependency on a stalled insn that is candidate for
1690 ; premature removal from the queue of stalled insns into the ready list (has
1691 ; an effect only if the flag 'sched_stalled_insns' is set).
1692 fsched-stalled-insns-dep
1693 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1694 Set dependence distance checking in premature scheduling of queued insns
1696 fsched-stalled-insns-dep=
1697 Common RejectNegative Joined UInteger
1698 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1700 fsched-group-heuristic
1701 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1702 Enable the group heuristic in the scheduler
1704 fsched-critical-path-heuristic
1705 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1706 Enable the critical path heuristic in the scheduler
1708 fsched-spec-insn-heuristic
1709 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1710 Enable the speculative instruction heuristic in the scheduler
1712 fsched-rank-heuristic
1713 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1714 Enable the rank heuristic in the scheduler
1716 fsched-last-insn-heuristic
1717 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1718 Enable the last instruction heuristic in the scheduler
1720 fsched-dep-count-heuristic
1721 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1722 Enable the dependent count heuristic in the scheduler
1725 Common Report Var(flag_section_anchors) Optimization
1726 Access data in the same section from shared anchor points
1730 Does nothing. Preserved for backward compatibility.
1733 Common Report Var(flag_zee) Init(0)
1734 Eliminate redundant zero extensions on targets that support implicit extensions.
1737 Common Report Var(flag_show_column) Init(1)
1738 Show column numbers in diagnostics, when available. Default on
1741 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1742 Disable optimizations observable by IEEE signaling NaNs
1745 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1746 Disable floating point optimizations that ignore the IEEE signedness of zero
1748 fsingle-precision-constant
1749 Common Report Var(flag_single_precision_constant) Optimization
1750 Convert floating point constants to single precision constants
1752 fsplit-ivs-in-unroller
1753 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1754 Split lifetimes of induction variables when loops are unrolled
1757 Common Report Var(flag_split_stack) Init(-1)
1758 Generate discontiguous stack frames
1761 Common Report Var(flag_split_wide_types) Optimization
1762 Split wide types into independent registers
1764 fvariable-expansion-in-unroller
1765 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1766 Apply variable expansion when loops are unrolled
1769 Common Report RejectNegative Joined
1770 -fstack-check=[no|generic|specific] Insert stack checking code into the program
1773 Common Alias(fstack-check=, specific, no)
1774 Insert stack checking code into the program. Same as -fstack-check=specific
1777 Common Var(common_deferred_options) Defer
1779 fstack-limit-register=
1780 Common RejectNegative Joined Var(common_deferred_options) Defer
1781 -fstack-limit-register=<register> Trap if the stack goes past <register>
1783 fstack-limit-symbol=
1784 Common RejectNegative Joined Var(common_deferred_options) Defer
1785 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
1788 Common Report Var(flag_stack_protect, 1)
1789 Use propolice as a stack protection method
1791 fstack-protector-all
1792 Common Report RejectNegative Var(flag_stack_protect, 2)
1793 Use a stack protection method for every function
1796 Common RejectNegative Var(flag_stack_usage)
1797 Output stack usage information on a per-function basis
1801 Does nothing. Preserved for backward compatibility.
1803 ; Nonzero if we should do (language-dependent) alias analysis.
1804 ; Typically, this analysis will assume that expressions of certain
1805 ; types do not alias expressions of certain other types. Only used
1806 ; if alias analysis (in general) is enabled.
1808 Common Report Var(flag_strict_aliasing) Optimization
1809 Assume strict aliasing rules apply
1812 Common Report Var(flag_strict_overflow)
1813 Treat signed overflow as undefined
1816 Common Report Var(flag_syntax_only)
1817 Check for syntax errors, then stop
1820 Common Report Var(flag_test_coverage)
1821 Create data files needed by \"gcov\"
1824 Common Report Var(flag_thread_jumps) Optimization
1825 Perform jump threading optimizations
1828 Common Report Var(time_report)
1829 Report the time taken by each compiler pass
1832 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
1833 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
1836 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
1839 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
1842 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
1845 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
1848 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
1851 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
1852 Reorder top level functions, variables, and asms
1855 Common Report Var(flag_tracer)
1856 Perform superblock formation via tail duplication
1858 ; Zero means that floating-point math operations cannot generate a
1859 ; (user-visible) trap. This is the case, for example, in nonstop
1860 ; IEEE 754 arithmetic.
1862 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
1863 Assume floating-point operations can trap
1866 Common Report Var(flag_trapv) Optimization
1867 Trap for signed overflow in addition, subtraction and multiplication
1870 Common Report Var(flag_tree_ccp) Optimization
1871 Enable SSA-CCP optimization on trees
1874 Common Report Var(flag_tree_bit_ccp) Optimization
1875 Enable SSA-BIT-CCP optimization on trees
1879 Does nothing. Preserved for backward compatibility.
1882 Common Report Var(flag_tree_ch) Optimization
1883 Enable loop header copying on trees
1886 Common Report Var(flag_tree_copyrename) Optimization
1887 Replace SSA temporaries with better names in copies
1890 Common Report Var(flag_tree_copy_prop) Optimization
1891 Enable copy propagation on trees
1893 ftree-store-copy-prop
1895 Does nothing. Preserved for backward compatibility.
1898 Common Report Var(flag_tree_cselim) Init(2) Optimization
1899 Transform condition stores into unconditional ones
1901 ftree-switch-conversion
1902 Common Report Var(flag_tree_switch_conversion) Optimization
1903 Perform conversions of switch initializations.
1906 Common Report Var(flag_tree_dce) Optimization
1907 Enable SSA dead code elimination optimization on trees
1909 ftree-dominator-opts
1910 Common Report Var(flag_tree_dom) Optimization
1911 Enable dominator optimizations
1914 Common Report Var(flag_tree_dse) Optimization
1915 Enable dead store elimination
1918 Common Report Var(flag_tree_forwprop) Init(1) Optimization
1919 Enable forward propagation on trees
1922 Common Report Var(flag_tree_fre) Optimization
1923 Enable Full Redundancy Elimination (FRE) on trees
1925 ftree-loop-distribution
1926 Common Report Var(flag_tree_loop_distribution) Optimization
1927 Enable loop distribution on trees
1929 ftree-loop-distribute-patterns
1930 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
1931 Enable loop distribution for patterns transformed into a library call
1934 Common Report Var(flag_tree_loop_im) Init(1) Optimization
1935 Enable loop invariant motion on trees
1938 Common Alias(floop-interchange)
1939 Enable loop interchange transforms. Same as -floop-interchange
1942 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
1943 Create canonical induction variables in loops
1946 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
1947 Enable loop optimizations on tree level
1949 ftree-parallelize-loops=
1950 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
1951 Enable automatic parallelization of loops
1954 Common Report Var(flag_tree_phiprop) Init(1) Optimization
1955 Enable hoisting loads from conditional pointers.
1958 Common Report Var(flag_tree_pre) Optimization
1959 Enable SSA-PRE optimization on trees
1962 Common Report Var(flag_tree_pta) Init(1) Optimization
1963 Perform function-local points-to analysis on trees.
1966 Common Report Var(flag_tree_reassoc) Init(1) Optimization
1967 Enable reassociation on tree level
1971 Does nothing. Preserved for backward compatibility.
1974 Common Report Var(flag_tree_sink) Optimization
1975 Enable SSA code sinking on trees
1978 Common Report Var(flag_tree_sra) Optimization
1979 Perform scalar replacement of aggregates
1982 Common Report Var(flag_tree_ter) Optimization
1983 Replace temporary expressions in the SSA->normal pass
1986 Common Report Var(flag_tree_live_range_split) Optimization
1987 Perform live range splitting during the SSA->normal pass
1990 Common Report Var(flag_tree_vrp) Init(0) Optimization
1991 Perform Value Range Propagation on trees
1994 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
1995 Compile whole compilation unit at a time
1998 Common Report Var(flag_unroll_loops) Optimization
1999 Perform loop unrolling when iteration count is known
2002 Common Report Var(flag_unroll_all_loops) Optimization
2003 Perform loop unrolling for all loops
2005 ; Nonzero means that loop optimizer may assume that the induction variables
2006 ; that control loops do not overflow and that the loops with nontrivial
2007 ; exit condition are not infinite
2008 funsafe-loop-optimizations
2009 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2010 Allow loop optimizations to assume that the loops behave in normal way
2013 Common Report Var(flag_associative_math) SetByCombined
2014 Allow optimization for floating-point arithmetic which may change the
2015 result of the operation due to rounding.
2018 Common Report Var(flag_reciprocal_math) SetByCombined
2019 Same as -fassociative-math for expressions which include division.
2021 ; Nonzero means that unsafe floating-point math optimizations are allowed
2022 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2023 ; are allowed to assume that their arguments and results are "normal"
2024 ; (e.g., nonnegative for SQRT).
2025 funsafe-math-optimizations
2026 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2027 Allow math optimizations that may violate IEEE or ISO standards
2030 Common Report Var(flag_unswitch_loops) Optimization
2031 Perform loop unswitching
2034 Common Report Var(flag_unwind_tables) Optimization
2035 Just generate unwind tables for exception handling
2040 ; Positive if we should track variables, negative if we should run
2041 ; the var-tracking pass only to discard debug annotations, zero if
2042 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2043 ; will be set according to optimize, debug_info_level and debug_hooks
2044 ; in process_options ().
2046 Common Report Var(flag_var_tracking) Init(2) Optimization
2047 Perform variable tracking
2049 ; Positive if we should track variables at assignments, negative if
2050 ; we should run the var-tracking pass only to discard debug
2051 ; annotations. When flag_var_tracking_assignments ==
2052 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2053 fvar-tracking-assignments
2054 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2055 Perform variable tracking by annotating assignments
2057 ; Nonzero if we should toggle flag_var_tracking_assignments after
2058 ; processing options and computing its default. */
2059 fvar-tracking-assignments-toggle
2060 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2061 Toggle -fvar-tracking-assignments
2063 fvar-tracking-uninit
2064 Common Report Var(flag_var_tracking_uninit) Optimization
2065 Perform variable tracking and also tag variables that are uninitialized
2068 Common Report Var(flag_tree_vectorize) Optimization
2069 Enable loop vectorization on trees
2072 Common Report Var(flag_tree_slp_vectorize) Init(2) Optimization
2073 Enable basic block vectorization (SLP) on trees
2076 Common Report Var(flag_vect_cost_model) Optimization
2077 Enable use of cost model in vectorization
2079 ftree-vect-loop-version
2080 Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization
2081 Enable loop versioning when doing loop vectorization on trees
2083 ftree-vectorizer-verbose=
2084 Common RejectNegative Joined UInteger
2085 -ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
2088 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2089 Enable copy propagation of scalar-evolution information.
2091 ; -fverbose-asm causes extra commentary information to be produced in
2092 ; the generated assembly code (to make it more readable). This option
2093 ; is generally only of use to those who actually need to read the
2094 ; generated assembly code (perhaps while debugging the compiler itself).
2095 ; -fno-verbose-asm, the default, causes the extra information
2096 ; to not be added and is useful when comparing two assembler files.
2098 Common Report Var(flag_verbose_asm)
2099 Add extra commentary to assembler output
2102 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2103 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2106 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2109 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2112 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2115 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2118 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2121 Common Report Var(flag_value_profile_transformations) Optimization
2122 Use expression value profiles in optimizations
2125 Common Report Var(flag_web) Init(2) Optimization
2126 Construct webs and split unrelated uses of single variable
2128 ftree-builtin-call-dce
2129 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2130 Enable conditional dead code elimination for builtin calls
2133 Common Report Var(flag_whole_program) Init(0) Optimization
2134 Perform whole program optimizations
2137 Common Report Var(flag_wrapv) Optimization
2138 Assume signed arithmetic overflow wraps around
2140 fzero-initialized-in-bss
2141 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2142 Put zero initialized data in the bss section
2145 Common JoinedOrMissing
2146 Generate debug information in default format
2149 Common JoinedOrMissing Negative(gdwarf-)
2150 Generate debug information in COFF format
2153 Common Joined UInteger Var(dwarf_version) Init(2) Negative(gstabs)
2154 Generate debug information in DWARF v2 (or later) format
2157 Common JoinedOrMissing
2158 Generate debug information in default extended format
2161 Common JoinedOrMissing Negative(gstabs+)
2162 Generate debug information in STABS format
2165 Common JoinedOrMissing Negative(gvms)
2166 Generate debug information in extended STABS format
2169 Common RejectNegative Var(dwarf_strict,0) Init(-1)
2170 Emit DWARF additions beyond selected version
2173 Common Report RejectNegative Var(dwarf_strict,1)
2174 Don't emit DWARF additions beyond selected version
2177 Common Report Var(flag_gtoggle)
2178 Toggle debug information generation
2181 Common JoinedOrMissing Negative(gxcoff)
2182 Generate debug information in VMS format
2185 Common JoinedOrMissing Negative(gxcoff+)
2186 Generate debug information in XCOFF format
2189 Common JoinedOrMissing Negative(gcoff)
2190 Generate debug information in extended XCOFF format
2193 Driver Joined Separate
2196 Common Joined Var(plugindir_string) Init(0)
2197 -iplugindir=<dir> Set <dir> to be the default plugin directory
2200 Driver Joined Separate
2205 no-canonical-prefixes
2218 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2219 -o <file> Place output into <file>
2222 Common Var(profile_flag)
2223 Enable function profiling
2226 Driver Var(pass_exit_codes)
2229 Common Var(pedantic)
2230 Issue warnings needed for strict compliance to the standard
2233 Common Var(flag_pedantic_errors)
2234 Like -pedantic but issue them as errors
2240 Driver Var(use_pipes)
2243 Driver JoinedOrMissing Var(print_file_name)
2245 print-libgcc-file-name
2248 print-multi-directory
2249 Driver Var(print_multi_directory)
2252 Driver Var(print_multi_lib)
2254 print-multi-os-directory
2255 Driver Var(print_multi_os_directory)
2258 Driver JoinedOrMissing Var(print_prog_name)
2261 Driver Var(print_search_dirs)
2264 Driver Var(print_sysroot)
2266 print-sysroot-headers-suffix
2267 Driver Var(print_sysroot_headers_suffix)
2270 Common Var(quiet_flag) RejectDriver
2271 Do not display functions compiled or elapsed time
2289 Driver Var(report_times)
2292 Driver JoinedOrMissing
2295 Driver Joined Separate
2299 ; C option, but driver must not handle as "-u ndef".
2302 Common Driver Var(verbose_flag)
2303 Enable verbose output
2306 Common Var(version_flag) RejectDriver
2307 Display the compiler's version
2310 Common Var(inhibit_warnings)
2314 Driver Separate Var(wrapper_string)
2317 Driver Joined Separate
2320 Common RejectNegative Negative(pie)
2321 Create a shared library
2327 Driver Separate Alias(specs=)
2340 ; Documented for Fortran, but always accepted by driver.
2347 ; Documented for Go, but always accepted by driver.
2353 Common RejectNegative Negative(shared)
2354 Create a position independent executable
2357 Driver Joined Separate
2359 ; This comment is to ensure we retain the blank line above.