1 ; Options for the language- and target-independent parts of the compiler.
3 ; Copyright (C) 2003-2015 Free Software Foundation, Inc.
5 ; This file is part of GCC.
7 ; GCC is free software; you can redistribute it and/or modify it under
8 ; the terms of the GNU General Public License as published by the Free
9 ; Software Foundation; either version 3, or (at your option) any later
12 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 ; You should have received a copy of the GNU General Public License
18 ; along with GCC; see the file COPYING3. If not see
19 ; <http://www.gnu.org/licenses/>.
21 ; See the GCC internals manual (options.texi) for a description of this file's format.
23 ; Please try to keep this file in ASCII collating order.
37 ; Not used directly to control optimizations, only to save -Ofast
38 ; setting for "optimize" attributes.
42 ; True if this is the lto front end. This is used to disable gimple
43 ; generation and lowering passes that are normally run on the output
44 ; of a front end. These passes must be bypassed for lto since they
45 ; have already been done before the gimple was written.
49 ; 0 means straightforward implementation of complex divide acceptable.
50 ; 1 means wide ranges of inputs must work for complex divide.
51 ; 2 means C99-like requirements for complex multiply and divide.
53 int flag_complex_method = 1
55 ; Nonzero if subexpressions must be evaluated from left-to-right.
57 int flag_evaluation_order = 0
59 ; Language specific warning pass for unused results.
61 bool flag_warn_unused_result = false
66 ; Nonzero if we should write GIMPLE bytecode for link-time optimization.
70 ; Nonzero if we should write GIMPLE bytecode for offload compilation.
72 int flag_generate_offload = 0
74 ; True to warn about any objects definitions whose size is larger
75 ; than N bytes. Also want about function definitions whose returned
76 ; values are larger than N bytes, where N is 'larger_than_size'.
81 HOST_WIDE_INT larger_than_size
83 ; True to warn about any function whose frame size is larger
86 bool warn_frame_larger_than
89 HOST_WIDE_INT frame_larger_than_size
91 ; Nonzero means we should be saving declaration info into a .X file.
93 int flag_gen_aux_info = 0
95 ; Nonzero if we are compiling code for a shared library, zero for
100 ; These two are really VEC(char_p,heap) *.
103 void *flag_instrument_functions_exclude_functions
106 void *flag_instrument_functions_exclude_files
108 ; Generic structs (e.g. templates not explicitly specialized)
109 ; may not have a compilation unit associated with them, and so
110 ; may need to be treated differently from ordinary structs.
112 ; Structs only handled by reference (indirectly), will also usually
113 ; not need as much debugging information.
116 enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
119 enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
121 ; True if we should exit after parsing options.
123 bool exit_after_options
125 ; Type(s) of debugging information we are producing (if any). See
126 ; flag-types.h for the definitions of the different possible types of
127 ; debugging information.
129 enum debug_info_type write_symbols = NO_DEBUG
131 ; Level of debugging information we are producing. See flag-types.h
132 ; for the definitions of the different possible levels.
134 enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
136 ; Nonzero means use GNU-only extensions in the generated symbolic
137 ; debugging information. Currently, this only has an effect when
138 ; write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG.
140 bool use_gnu_debug_info_extensions
142 ; Original value of maximum field alignment in bytes, specified via
143 ; -fpack-struct=<value>.
145 unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
147 ; Type of stack check.
149 enum stack_check_type flag_stack_check = NO_STACK_CHECK
151 ; True if stack usage information needs to be computed.
153 bool flag_stack_usage_info = false
155 ; -dA causes debug commentary information to be produced in
156 ; the generated assembly code (to make it more readable). This option
157 ; is generally only of use to those who actually need to read the
158 ; generated assembly code (perhaps while debugging the compiler itself).
159 ; Currently, this switch is only used by dwarf2out.c; however, it is intended
160 ; to be a catchall for printing debug information in the assembler file.
164 ; -dP causes the rtl to be emitted as a comment in assembly.
166 int flag_dump_rtl_in_asm
168 ; Whether -da was passed (used only in handle_common_deferred_options).
170 bool flag_dump_all_passed
172 ; Other flags saying which kinds of debugging dump have been requested.
175 int rtl_dump_and_exit
178 int flag_print_asm_name
180 ; Name of top-level original source file (what was input to cpp).
181 ; This comes from the #-command at the beginning of the actual input.
182 ; If there isn't any there, then this is the cc1 input file name.
184 const char *main_input_filename
186 ; Pointer to base name in main_input_filename, with directories and a
187 ; single final extension removed, and the length of this base
191 const char *main_input_basename
194 int main_input_baselength
196 ; Which options have been printed by --help.
200 ; Which enums have been printed by --help. 0 = not printed, no
201 ; relevant options seen, 1 = relevant option seen, not yet printed, 2
204 char *help_enum_printed
206 ; The number of columns for --help output.
208 unsigned int help_columns
210 ; Whether this options structure has been through finish_options
212 bool flag_opts_finished
214 ; What the sanitizer should instrument
216 unsigned int flag_sanitize
218 ; What sanitizers should recover from errors
220 unsigned int flag_sanitize_recover = SANITIZE_UNDEFINED | SANITIZE_NONDEFAULT | SANITIZE_KERNEL_ADDRESS
222 ; Flag whether a prefix has been added to dump_base_name
224 bool dump_base_name_prefixed = false
236 Driver Alias(coverage)
242 Common Separate Alias(d)
245 Common Joined Alias(d)
248 Common Separate Alias(dumpbase)
251 Common Separate Alias(dumpdir)
254 Driver Separate Alias(e)
257 Driver Joined Alias(e)
260 Common Warning Alias(Wextra)
263 Driver Separate Alias(Xassembler)
266 Driver JoinedOrMissing Alias(Xassembler)
269 Driver Separate Alias(Xlinker)
272 Driver JoinedOrMissing Alias(Xlinker)
275 Driver Separate Alias(u)
278 Driver Joined Alias(u)
281 Common Driver Var(help_flag)
282 Display this information
285 Common Driver Report Joined
286 --help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params
289 Driver Separate Alias(x)
292 Driver Joined Alias(x)
295 Driver Separate Alias(L)
298 Driver Joined Alias(L)
300 -no-canonical-prefixes
301 Driver Alias(no-canonical-prefixes)
303 -no-standard-libraries
304 Driver Alias(nostdlib)
307 Driver Var(no_sysroot_suffix)
316 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
319 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
322 Driver Alias(pass-exit-codes)
325 Common Alias(Wpedantic)
328 Common Alias(pedantic-errors)
337 Driver Separate Alias(B)
340 Driver JoinedOrMissing Alias(B)
346 Driver Separate Alias(print-file-name=)
349 Driver JoinedOrMissing Alias(print-file-name=)
351 -print-libgcc-file-name
352 Driver Alias(print-libgcc-file-name)
354 -print-multi-directory
355 Driver Alias(print-multi-directory)
358 Driver Alias(print-multi-lib)
360 -print-multi-os-directory
361 Driver Alias(print-multi-os-directory)
364 Driver Alias(print-multiarch)
367 Driver Separate Alias(print-prog-name=)
370 Driver JoinedOrMissing Alias(print-prog-name=)
373 Driver Alias(print-search-dirs)
376 Driver Alias(print-sysroot)
378 -print-sysroot-headers-suffix
379 Driver Alias(print-sysroot-headers-suffix)
385 Driver Alias(save-temps)
391 Driver Separate Alias(specs=)
394 Driver Joined Alias(specs=)
400 Driver Alias(symbolic)
404 Alias for --help=target
412 ;; The driver used to convert options such as --help into forms such
413 ;; as -fhelp; the following four entries are for compatibility with
414 ;; any direct uses of those (undocumented) -f forms
416 Common Driver Alias(-help)
419 Common Driver Joined Alias(-help=)
422 Common Driver Alias(-target-help)
425 Common Driver Alias(-version)
429 --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
432 Common Joined Alias(-param)
435 Driver Separate Alias(-sysroot=)
438 Driver JoinedOrMissing
444 Driver Joined Separate
450 Driver Joined Separate
456 Common JoinedOrMissing Optimization
457 -O<number> Set optimization level to <number>
461 Optimize for space rather than speed
465 Optimize for speed disregarding exact standards compliance
469 Optimize for debugging experience rather than speed or size
481 Driver Joined Separate
487 Driver Joined Separate
508 Common RejectNegative Warning Alias(Wextra)
509 This switch is deprecated; use -Wextra instead
512 Driver JoinedOrMissing
515 Driver JoinedOrMissing
518 Driver JoinedOrMissing
521 Common Var(warn_aggregate_return) Warning
522 Warn about returning structures, unions or arrays
524 Waggressive-loop-optimizations
525 Common Var(warn_aggressive_loop_optimizations) Init(1) Warning
526 Warn if a loop with constant number of iterations triggers undefined behavior
529 Common Var(warn_array_bounds) Warning
530 Warn if an array is accessed out of bounds
533 Common Joined RejectNegative UInteger Var(warn_array_bounds) Warning
534 Warn if an array is accessed out of bounds
537 Common Var(warn_attributes) Init(1) Warning
538 Warn about inappropriate attribute usage
541 Common Var(warn_cast_align) Warning
542 Warn about pointer casts which increase alignment
545 Common Var(warn_cpp) Init(1) Warning
546 Warn when a #warning directive is encountered
548 Wdeprecated-declarations
549 Common Var(warn_deprecated_decl) Init(1) Warning
550 Warn about uses of __attribute__((deprecated)) declarations
552 Wdisabled-optimization
553 Common Var(warn_disabled_optimization) Warning
554 Warn when an optimization pass is disabled
557 Common Var(warnings_are_errors)
558 Treat all warnings as errors
562 Treat specified warning as error
565 Common Var(extra_warnings) Warning
566 Print extra (possibly unwanted) warnings
569 Common Var(flag_fatal_errors)
570 Exit on the first error occurred
573 Common RejectNegative Joined UInteger
574 -Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
577 Common Var(warn_free_nonheap_object) Init(1) Warning
578 Warn when attempting to free a non-heap object
581 Common Var(warn_inline) Warning
582 Warn when an inlined function cannot be inlined
584 Winvalid-memory-model
585 Common Var(warn_invalid_memory_model) Init(1) Warning
586 Warn when an atomic memory model parameter is known to be outside the valid range.
589 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
592 Common RejectNegative Joined UInteger Warning
593 -Wlarger-than=<number> Warn if an object is larger than <number> bytes
595 Wunsafe-loop-optimizations
596 Common Var(warn_unsafe_loop_optimizations) Warning
597 Warn if the loop cannot be optimized due to nontrivial assumptions.
600 Common Alias(Wsuggest-attribute=noreturn)
603 Common Var(warn_odr_violations) Init(1) Warning
604 Warn about some C++ One Definition Rule violations during link time optimization
607 Common Var(warn_overflow) Init(1) Warning
608 Warn about overflow in arithmetic expressions
611 Common Var(warn_packed) Warning
612 Warn when the packed attribute has no effect on struct layout
615 Common Var(warn_padded) Warning
616 Warn when padding is required to align structure members
619 Common Var(pedantic) Init(0) Warning
620 Issue warnings needed for strict compliance to the standard
623 Common Var(warn_return_local_addr) Init(1) Warning
624 Warn about returning a pointer/reference to a local or temporary variable.
627 Common Var(warn_shadow) Warning
628 Warn when one local variable shadows another
631 Common Var(warn_stack_protect) Warning
632 Warn when not issuing stack smashing protection for some reason
635 Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
636 Warn if stack usage might be larger than specified amount
640 Warn about code which might break strict aliasing rules
643 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
644 Warn about code which might break strict aliasing rules
648 Warn about optimizations that assume that signed overflow is undefined
651 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
652 Warn about optimizations that assume that signed overflow is undefined
654 Wsuggest-attribute=const
655 Common Var(warn_suggest_attribute_const) Warning
656 Warn about functions which might be candidates for __attribute__((const))
658 Wsuggest-attribute=pure
659 Common Var(warn_suggest_attribute_pure) Warning
660 Warn about functions which might be candidates for __attribute__((pure))
662 Wsuggest-attribute=noreturn
663 Common Var(warn_suggest_attribute_noreturn) Warning
664 Warn about functions which might be candidates for __attribute__((noreturn))
667 Common Var(warn_suggest_final_types) Warning
668 Warn about C++ polymorphic types where adding final keyword would improve code quality
670 Wsuggest-final-methods
671 Common Var(warn_suggest_final_methods) Warning
672 Warn about C++ virtual methods where adding final keyword would improve code quality
675 Common Var(warn_system_headers) Warning
676 Do not suppress warnings from system headers
679 Common Var(warn_trampolines) Warning
680 Warn whenever a trampoline is generated
683 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
684 Warn if a comparison is always true or always false due to the limited range of the data type
687 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
688 Warn about uninitialized automatic variables
691 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
692 Warn about maybe uninitialized automatic variables
696 Does nothing. Preserved for backward compatibility.
699 Common Var(warn_unused) Init(0) Warning
700 Enable all -Wunused- warnings
702 Wunused-but-set-parameter
703 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
704 Warn when a function parameter is only set, otherwise unused
706 Wunused-but-set-variable
707 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
708 Warn when a variable is only set, otherwise unused
711 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
712 Warn when a function is unused
715 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
716 Warn when a label is unused
719 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
720 Warn when a function parameter is unused
723 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
724 Warn when an expression value is unused
727 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
728 Warn when a variable is unused
731 Common Var(warn_coverage_mismatch) Init(1) Warning
732 Warn in case profiles in -fprofile-use do not match
734 Wvector-operation-performance
735 Common Var(warn_vector_operation_performance) Warning
736 Warn when a vector operation is compiled outside the SIMD
751 Common Separate Var(aux_info_file_name)
752 -aux-info <file> Emit declaration information into <file>
755 Common Joined Alias(aux-info)
758 Common Separate RejectDriver Var(aux_base_name)
761 Common Separate RejectDriver
771 -d<letters> Enable dumps from specific passes of the compiler
774 Common Separate Var(dump_base_name)
775 -dumpbase <file> Set the file basename to be used for dumps
778 Common Separate Var(dump_dir_name)
779 -dumpdir <dir> Set the directory name to be used for dumps
791 Driver Joined Separate
793 ; This option has historically been passed down to the linker by an
794 ; accident of a %{e*} spec, so ensure it continues to be passed down
795 ; as a single option. The supported option for this purpose is
796 ; -rdynamic. See PR 47390.
800 ; The version of the C++ ABI in use. The following values are allowed:
802 ; 0: The version of the ABI believed most conformant with the C++ ABI
803 ; specification. This ABI may change as bugs are discovered and fixed.
804 ; Therefore, 0 will not necessarily indicate the same ABI in different
807 ; 1: The version of the ABI first used in G++ 3.2. No longer selectable.
809 ; 2: The version of the ABI first used in G++ 3.4, and the default
812 ; 3: The version of the ABI that fixes the missing underscore
813 ; in template non-type arguments of pointer type.
815 ; 4: The version of the ABI that introduces unambiguous mangling of
816 ; vector types. First selectable in G++ 4.5.
818 ; 5: The version of the ABI that ignores attribute const/noreturn
819 ; in function pointer mangling, and corrects mangling of decltype and
820 ; function parameters used in other parameters and the return type.
821 ; First selectable in G++ 4.6.
823 ; 6: The version of the ABI that doesn't promote scoped enums to int and
824 ; changes the mangling of template argument packs, const/static_cast,
825 ; prefix ++ and --, and a class scope function used as a template
827 ; First selectable in G++ 4.7.
829 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
830 ; corrects the mangling of lambdas in default argument scope.
831 ; First selectable in G++ 4.8.
833 ; 8: The version of the ABI that corrects the substitution behavior of
834 ; function types with function-cv-qualifiers.
835 ; First selectable in G++ 4.9 and default in G++ 5
837 ; 9: The version of the ABI that corrects the alignment of nullptr_t.
838 ; First selectable and default in G++ 5.2.
839 ; (set in c_common_post_options).
841 ; Additional positive integers will be assigned as new versions of
842 ; the ABI become the default version of the ABI.
844 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(0)
845 The version of the C++ ABI in use
847 faggressive-loop-optimizations
848 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
849 Aggressively optimize loops using language constraints
852 Common Report Var(align_functions,0) Optimization UInteger
853 Align the start of functions
856 Common RejectNegative Joined UInteger Var(align_functions)
859 Common Report Var(align_jumps,0) Optimization UInteger
860 Align labels which are only reached by jumping
863 Common RejectNegative Joined UInteger Var(align_jumps)
866 Common Report Var(align_labels,0) Optimization UInteger
870 Common RejectNegative Joined UInteger Var(align_labels)
873 Common Report Var(align_loops,0) Optimization UInteger
874 Align the start of loops
877 Common RejectNegative Joined UInteger Var(align_loops)
881 Does nothing. Preserved for backward compatibility.
885 Does nothing. Preserved for backward compatibility.
887 fargument-noalias-global
889 Does nothing. Preserved for backward compatibility.
891 fargument-noalias-anything
893 Does nothing. Preserved for backward compatibility.
896 Common Driver Report Joined
897 Select what to sanitize
900 Common Joined RejectNegative Var(common_deferred_options) Defer
901 -fasan-shadow-offset=<number> Use custom shadow memory offset.
905 After diagnosing undefined behavior attempt to continue execution
909 This switch is deprecated; use -fsanitize-recover= instead
911 fsanitize-undefined-trap-on-error
912 Common Driver Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
913 Use trap instead of a library function for undefined behavior sanitization
915 fasynchronous-unwind-tables
916 Common Report Var(flag_asynchronous_unwind_tables) Optimization
917 Generate unwind tables that are exact at each instruction boundary
920 Common Report Var(flag_auto_inc_dec) Init(1) Optimization
921 Generate auto-inc/dec instructions
924 Common Report Var(flag_auto_profile)
925 Use sample profile information for call graph node weights. The default
926 profile file is fbdata.afdo in 'pwd'.
929 Common Joined RejectNegative Var(auto_profile_file)
930 Use sample profile information for call graph node weights. The profile
931 file is specified in the argument.
933 ; -fcheck-bounds causes gcc to generate array bounds checks.
934 ; For C, C++ and ObjC: defaults off.
935 ; For Java: defaults to on.
936 ; For Fortran: defaults to off.
938 Common Report Var(flag_bounds_check)
939 Generate code to check bounds before indexing arrays
942 Common Report Var(flag_branch_on_count_reg) Optimization
943 Replace add, compare, branch with branch on count register
945 fbranch-probabilities
946 Common Report Var(flag_branch_probabilities) Optimization
947 Use profiling information for branch probabilities
949 fbranch-target-load-optimize
950 Common Report Var(flag_branch_target_load_optimize) Optimization
951 Perform branch target load optimization before prologue / epilogue threading
953 fbranch-target-load-optimize2
954 Common Report Var(flag_branch_target_load_optimize2) Optimization
955 Perform branch target load optimization after prologue / epilogue threading
958 Common Report Var(flag_btr_bb_exclusive) Optimization
959 Restrict target load migration not to re-use registers in any basic block
962 Common Joined RejectNegative Var(common_deferred_options) Defer
963 -fcall-saved-<register> Mark <register> as being preserved across functions
966 Common Joined RejectNegative Var(common_deferred_options) Defer
967 -fcall-used-<register> Mark <register> as being corrupted by function calls
969 ; Nonzero for -fcaller-saves: allocate values in regs that need to
970 ; be saved across function calls, if that produces overall better code.
971 ; Optional now, so people can test it.
973 Common Report Var(flag_caller_saves) Optimization
974 Save registers around function calls
977 Common Report Var(flag_check_data_deps)
978 Compare the results of several data dependence analyzers.
981 Common Var(flag_check_new)
982 Check the return value of new in C++
984 fcombine-stack-adjustments
985 Common Report Var(flag_combine_stack_adjustments) Optimization
986 Looks for opportunities to reduce stack adjustments and stack references.
989 Common Report Var(flag_no_common,0)
990 Do not put uninitialized globals in the common section
994 ; Converted by the driver to -fcompare-debug= options.
997 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
998 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
1000 fcompare-debug-second
1001 Common Driver RejectNegative Var(flag_compare_debug)
1002 Run only the second compilation of -fcompare-debug
1005 Common Report Var(flag_compare_elim_after_reload) Optimization
1006 Perform comparison elimination after register allocation has finished
1009 Common Var(flag_conserve_stack) Optimization
1010 Do not perform optimizations increasing noticeably stack usage
1013 Common Report Var(flag_cprop_registers) Optimization
1014 Perform a register copy-propagation optimization pass
1017 Common Report Var(flag_crossjumping) Optimization
1018 Perform cross-jumping optimization
1021 Common Report Var(flag_cse_follow_jumps) Optimization
1022 When running CSE, follow jumps to their targets
1026 Does nothing. Preserved for backward compatibility.
1029 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
1030 Omit range reduction step when performing complex division
1033 Common Report Var(flag_cx_fortran_rules) Optimization
1034 Complex multiplication and division follow Fortran rules
1037 Common Report Var(flag_data_sections)
1038 Place data items into their own section
1041 Common Report Var(common_deferred_options) Defer
1042 List all available debugging counters with their limits and counts.
1045 Common RejectNegative Joined Var(common_deferred_options) Defer
1046 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
1049 Common Joined RejectNegative Var(common_deferred_options) Defer
1050 Map one directory name to another in debug information
1052 fdebug-types-section
1053 Common Report Var(flag_debug_types_section) Init(0)
1054 Output .debug_types section when using DWARF v4 debuginfo.
1056 ; Nonzero for -fdefer-pop: don't pop args after each function call
1057 ; instead save them up to pop many calls' args with one insns.
1059 Common Report Var(flag_defer_pop) Optimization
1060 Defer popping functions args from stack until later
1063 Common Report Var(flag_delayed_branch) Optimization
1064 Attempt to fill delay slots of branch instructions
1066 fdelete-dead-exceptions
1067 Common Report Var(flag_delete_dead_exceptions) Init(0) Optimization
1068 Delete dead instructions that may throw exceptions
1070 fdelete-null-pointer-checks
1071 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
1072 Delete useless null pointer checks
1074 fdevirtualize-at-ltrans
1075 Common Report Var(flag_ltrans_devirtualize)
1076 Stream extra data to support more aggressive devirtualization in LTO local transformation mode
1078 fdevirtualize-speculatively
1079 Common Report Var(flag_devirtualize_speculatively) Optimization
1080 Perform speculative devirtualization
1083 Common Report Var(flag_devirtualize) Optimization
1084 Try to convert virtual calls to direct ones.
1086 fdiagnostics-show-location=
1087 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1088 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
1090 ; Required for these enum values.
1095 Name(diagnostic_prefixing_rule) Type(int)
1098 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1101 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1103 fdiagnostics-show-caret
1104 Common Var(flag_diagnostics_show_caret) Init(1)
1105 Show the source line with a caret indicating the column
1108 Common Alias(fdiagnostics-color=,always,never)
1112 Driver Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1113 -fdiagnostics-color=[never|always|auto] Colorize diagnostics
1115 ; Required for these enum values.
1120 Name(diagnostic_color_rule) Type(int)
1123 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1126 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1129 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1131 fdiagnostics-show-option
1132 Common Var(flag_diagnostics_show_option) Init(1)
1133 Amend appropriate diagnostic messages with the command line option that controls them
1136 Common Joined RejectNegative Var(common_deferred_options) Defer
1137 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1140 Common Joined RejectNegative Var(common_deferred_options) Defer
1141 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1144 Common Joined RejectNegative Var(common_deferred_options) Defer
1145 -fdump-<type> Dump various compiler internals to a file
1148 Driver RejectNegative
1151 Common RejectNegative Joined Var(flag_dump_final_insns)
1152 -fdump-final-insns=filename Dump to filename the insns at the end of translation
1155 Common RejectNegative Joined Var(flag_dump_go_spec)
1156 -fdump-go-spec=filename Write all declarations to file as Go code
1159 Common Report Var(flag_dump_noaddr)
1160 Suppress output of addresses in debugging dumps
1163 Common Driver Var(flag_report_bug)
1164 Collect and dump debug information into temporary file if ICE in C/C++
1168 Common Var(flag_dump_passes) Init(0)
1169 Dump optimization passes
1172 Common Report Var(flag_dump_unnumbered)
1173 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1175 fdump-unnumbered-links
1176 Common Report Var(flag_dump_unnumbered_links)
1177 Suppress output of previous and next insn numbers in debugging dumps
1180 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1181 Enable CFI tables via GAS assembler directives.
1184 Common Report Var(flag_early_inlining) Init(1) Optimization
1185 Perform early inlining
1187 feliminate-dwarf2-dups
1188 Common Report Var(flag_eliminate_dwarf2_dups)
1189 Perform DWARF2 duplicate elimination
1192 Common Report Var(flag_ipa_sra) Init(0) Optimization
1193 Perform interprocedural reduction of aggregates
1195 feliminate-unused-debug-symbols
1196 Common Report Var(flag_debug_only_used_symbols)
1197 Perform unused symbol elimination in debug info
1199 feliminate-unused-debug-types
1200 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1201 Perform unused type elimination in debug info
1203 femit-class-debug-always
1204 Common Report Var(flag_emit_class_debug_always) Init(0)
1205 Do not suppress C++ class debug information.
1208 Common Report Var(flag_exceptions) Optimization
1209 Enable exception handling
1211 fexpensive-optimizations
1212 Common Report Var(flag_expensive_optimizations) Optimization
1213 Perform a number of minor, expensive optimizations
1216 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1217 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1220 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1223 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1226 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1232 Common Var(flag_fat_lto_objects)
1233 Output lto objects containing both the intermediate language and binary output.
1236 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1237 Assume no NaNs or infinities are generated
1240 Common Joined RejectNegative Var(common_deferred_options) Defer
1241 -ffixed-<register> Mark <register> as being unavailable to the compiler
1244 Common Report Var(flag_float_store) Optimization
1245 Don't allocate floats and doubles in extended-precision registers
1249 Does nothing. Preserved for backward compatibility.
1252 Common Report Var(flag_forward_propagate) Optimization
1253 Perform a forward propagation pass on RTL
1256 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST) Optimization
1257 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1260 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1263 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1265 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1267 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1270 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1272 ; Nonzero means don't put addresses of constant functions in registers.
1273 ; Used for compiling the Unix kernel, where strange substitutions are
1274 ; done on the assembly output.
1276 Common Report Var(flag_no_function_cse,0) Optimization
1277 Allow function addresses to be held in registers
1280 Common Report Var(flag_function_sections)
1281 Place each function into its own section
1284 Common Report Var(flag_gcse) Optimization
1285 Perform global common subexpression elimination
1288 Common Report Var(flag_gcse_lm) Init(1) Optimization
1289 Perform enhanced load motion during global common subexpression elimination
1292 Common Report Var(flag_gcse_sm) Init(0) Optimization
1293 Perform store motion after global common subexpression elimination
1296 Common Report Var(flag_gcse_las) Init(0) Optimization
1297 Perform redundant load after store elimination in global common subexpression
1301 Common Report Var(flag_gcse_after_reload) Optimization
1302 Perform global common subexpression elimination after register allocation
1305 ; This option is not documented yet as its semantics will change.
1307 Common Report Var(flag_graphite) Optimization
1308 Enable in and out of Graphite representation
1311 Common Report Var(flag_graphite_identity) Optimization
1312 Enable Graphite Identity transformation
1314 fhoist-adjacent-loads
1315 Common Report Var(flag_hoist_adjacent_loads) Optimization
1316 Enable hoisting adjacent loads to encourage generating conditional move
1319 floop-parallelize-all
1320 Common Report Var(flag_loop_parallelize_all) Optimization
1321 Mark all loops as parallel
1324 Common Report Var(flag_loop_strip_mine) Optimization
1325 Enable Loop Strip Mining transformation
1328 Common Report Var(flag_loop_interchange) Optimization
1329 Enable Loop Interchange transformation
1332 Common Report Var(flag_loop_block) Optimization
1333 Enable Loop Blocking transformation
1335 floop-unroll-and-jam
1336 Common Report Var(flag_loop_unroll_jam) Optimization
1337 Enable Loop Unroll Jam transformation
1340 Common Report Var(flag_tm)
1341 Enable support for GNU transactional memory
1344 Common Report Var(flag_gnu_unique) Init(1)
1345 Use STB_GNU_UNIQUE if supported by the assembler
1349 Does nothing. Preserved for backward compatibility.
1352 Common Report Var(flag_loop_optimize_isl) Optimization
1353 Enable the ISL based loop nest optimizer
1355 fstrict-volatile-bitfields
1356 Common Report Var(flag_strict_volatile_bitfields) Init(-1) Optimization
1357 Force bitfield accesses to match their type width
1359 fguess-branch-probability
1360 Common Report Var(flag_guess_branch_prob) Optimization
1361 Enable guessing of branch probabilities
1363 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1364 ; Generate position-independent code for executables if possible
1365 ; On SVR4 targets, it also controls whether or not to emit a
1366 ; string identifying the compiler.
1368 Common Report Var(flag_no_ident,0)
1369 Process #ident directives
1372 Common Report Var(flag_if_conversion) Optimization
1373 Perform conversion of conditional jumps to branchless equivalents
1376 Common Report Var(flag_if_conversion2) Optimization
1377 Perform conversion of conditional jumps to conditional execution
1380 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL) Optimization
1381 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1384 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1387 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1390 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1393 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1395 ftree-loop-if-convert
1396 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1397 Convert conditional jumps in innermost loops to branchless equivalents
1399 ftree-loop-if-convert-stores
1400 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1401 Also if-convert conditional jumps containing memory writes
1403 ; -finhibit-size-directive inhibits output of .size for ELF.
1404 ; This is used only for compiling crtstuff.c,
1405 ; and it may be extended to other effects
1406 ; needed for crtstuff.c on other systems.
1407 finhibit-size-directive
1408 Common Report Var(flag_inhibit_size_directive)
1409 Do not generate .size directives
1412 Common Report Var(flag_indirect_inlining) Optimization
1413 Perform indirect inlining
1415 ; General flag to enable inlining. Specifying -fno-inline will disable
1416 ; all inlining apart from always-inline functions.
1418 Common Report Var(flag_no_inline,0) Init(0) Optimization
1419 Enable inlining of function declared \"inline\", disabling disables all inlining
1421 finline-small-functions
1422 Common Report Var(flag_inline_small_functions) Optimization
1423 Integrate functions into their callers when code size is known not to grow
1426 Common Report Var(flag_inline_functions) Optimization
1427 Integrate functions not declared \"inline\" into their callers when profitable
1429 finline-functions-called-once
1430 Common Report Var(flag_inline_functions_called_once) Optimization
1431 Integrate functions only required by their single caller
1434 Common RejectNegative Joined Alias(finline-limit=)
1437 Common RejectNegative Joined UInteger
1438 -finline-limit=<number> Limit the size of inlined functions to <number>
1441 Common Report Var(flag_inline_atomics) Init(1) Optimization
1442 Inline __atomic operations when a lock free instruction sequence is available.
1444 finstrument-functions
1445 Common Report Var(flag_instrument_function_entry_exit)
1446 Instrument function entry and exit with profiling calls
1448 finstrument-functions-exclude-function-list=
1449 Common RejectNegative Joined
1450 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1452 finstrument-functions-exclude-file-list=
1453 Common RejectNegative Joined
1454 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1457 Common Report Var(flag_ipa_cp) Optimization
1458 Perform interprocedural constant propagation
1461 Common Report Var(flag_ipa_cp_clone) Optimization
1462 Perform cloning to make Interprocedural constant propagation stronger
1465 Common Report Var(flag_ipa_cp_alignment) Optimization
1466 Perform alignment discovery and propagation to make Interprocedural constant propagation stronger
1469 Common Report Var(flag_ipa_profile) Init(0) Optimization
1470 Perform interprocedural profile propagation
1473 Common Report Var(flag_ipa_pta) Init(0) Optimization
1474 Perform interprocedural points-to analysis
1477 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1478 Discover pure and const functions
1481 Common Report Var(flag_ipa_icf) Optimization
1482 Perform Identical Code Folding for functions and read-only variables
1485 Common Report Var(flag_ipa_icf_functions) Optimization
1486 Perform Identical Code Folding for functions
1489 Common Report Var(flag_ipa_icf_variables)
1490 Perform Identical Code Folding for variables
1493 Common Report Var(flag_ipa_reference) Init(0) Optimization
1494 Discover readonly and non addressable static variables
1498 Does nothing. Preserved for backward compatibility.
1502 Does nothing. Preserved for backward compatibility.
1505 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB) Optimization
1506 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1509 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1512 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1515 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1518 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT) Optimization
1519 -fira-region=[one|all|mixed] Set regions for IRA
1522 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1525 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1528 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1531 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1534 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1535 Use IRA based register pressure calculation
1536 in RTL hoist optimizations.
1539 Common Report Var(flag_ira_loop_pressure) Optimization
1540 Use IRA based register pressure calculation
1541 in RTL loop optimizations.
1543 fira-share-save-slots
1544 Common Report Var(flag_ira_share_save_slots) Init(1) Optimization
1545 Share slots for saving different hard registers.
1547 fira-share-spill-slots
1548 Common Report Var(flag_ira_share_spill_slots) Init(1) Optimization
1549 Share stack slots for spilled pseudo-registers.
1552 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1553 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1556 Common Report Var(flag_ivopts) Init(1) Optimization
1557 Optimize induction variables on trees
1560 Common Var(flag_jump_tables) Init(1) Optimization
1561 Use jump tables for sufficiently large switch statements
1563 fkeep-inline-functions
1564 Common Report Var(flag_keep_inline_functions)
1565 Generate code for functions even if they are fully inlined
1568 Common Report Var(flag_keep_static_consts) Init(1)
1569 Emit static const variables even if they are not used
1572 Common Report Var(flag_leading_underscore) Init(-1)
1573 Give external symbols a leading underscore
1577 Does nothing. Preserved for backward compatibility.
1580 Common Report Var(flag_lra_remat) Optimization
1581 Do CFG-sensitive rematerialization in LRA
1585 Enable link-time optimization.
1588 Common RejectNegative Joined Var(flag_lto)
1589 Link-time optimization with number of parallel jobs or jobserver.
1592 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1595 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1598 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1601 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1604 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1607 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1610 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1611 Specify the algorithm to partition symbols and vars at linktime
1613 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1614 flto-compression-level=
1615 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1616 -flto-compression-level=<number> Use zlib compression level <number> for IL
1618 flto-odr-type-merging
1619 Common Report Var(flag_lto_odr_type_mering) Init(1)
1620 Merge C++ types using One Definition Rule
1623 Common Report Var(flag_lto_report) Init(0)
1624 Report various link-time optimization statistics
1627 Common Report Var(flag_lto_report_wpa) Init(0)
1628 Report various link-time optimization statistics for WPA only
1631 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1632 Set errno after built-in math functions
1635 Common Joined RejectNegative UInteger Var(flag_max_errors)
1636 -fmax-errors=<number> Maximum number of errors to report
1639 Common Report Var(mem_report)
1640 Report on permanent memory allocation
1643 Common Report Var(mem_report_wpa)
1644 Report on permanent memory allocation in WPA only
1646 ; This will attempt to merge constant section constants, if 1 only
1647 ; string constants and constants from constant pool, if 2 also constant
1649 fmerge-all-constants
1650 Common Report Var(flag_merge_constants,2) Init(1)
1651 Attempt to merge identical constants and constant variables
1654 Common Report Var(flag_merge_constants,1)
1655 Attempt to merge identical constants across compilation units
1657 fmerge-debug-strings
1658 Common Report Var(flag_merge_debug_strings) Init(1)
1659 Attempt to merge identical debug strings across compilation units
1662 Common RejectNegative Joined UInteger
1663 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1666 Common Report Var(flag_modulo_sched) Optimization
1667 Perform SMS based modulo scheduling before the first scheduling pass
1669 fmodulo-sched-allow-regmoves
1670 Common Report Var(flag_modulo_sched_allow_regmoves) Optimization
1671 Perform SMS based modulo scheduling with register moves allowed
1673 fmove-loop-invariants
1674 Common Report Var(flag_move_loop_invariants) Optimization
1675 Move loop invariant computations out of loops
1678 Common Var(flag_dce) Init(1) Optimization
1679 Use the RTL dead code elimination pass
1682 Common Var(flag_dse) Init(1) Optimization
1683 Use the RTL dead store elimination pass
1685 freschedule-modulo-scheduled-loops
1686 Common Report Var(flag_resched_modulo_sched) Optimization
1687 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1689 fnon-call-exceptions
1690 Common Report Var(flag_non_call_exceptions) Optimization
1691 Support synchronous non-call exceptions
1694 Common Driver Joined MissingArgError(options or targets missing after %qs)
1695 -foffload=<targets>=<options> Specify offloading targets and options for them
1698 Common Joined RejectNegative Enum(offload_abi) Var(flag_offload_abi) Init(OFFLOAD_ABI_UNSET)
1699 -foffload-abi=[lp64|ilp32] Set the ABI to use in an offload compiler
1702 Name(offload_abi) Type(enum offload_abi) UnknownError(unknown offload ABI %qs)
1705 Enum(offload_abi) String(ilp32) Value(OFFLOAD_ABI_ILP32)
1708 Enum(offload_abi) String(lp64) Value(OFFLOAD_ABI_LP64)
1711 Common Report Var(flag_omit_frame_pointer) Optimization
1712 When possible do not generate stack frames
1715 Common Report Var(flag_opt_info) Optimization
1716 Enable all optimization info dumps on stderr
1719 Common Joined RejectNegative Var(common_deferred_options) Defer
1720 -fopt-info[-<type>=filename] Dump compiler optimization details
1722 foptimize-register-move
1724 Does nothing. Preserved for backward compatibility.
1726 foptimize-sibling-calls
1727 Common Report Var(flag_optimize_sibling_calls) Optimization
1728 Optimize sibling and tail recursive calls
1731 Common Report Var(flag_partial_inlining) Optimization
1732 Perform partial inlining
1735 Common Report Var(pre_ipa_mem_report)
1736 Report on memory allocation before interprocedural optimization
1738 fpost-ipa-mem-report
1739 Common Report Var(post_ipa_mem_report)
1740 Report on memory allocation before interprocedural optimization
1743 Common Report Var(flag_pack_struct) Optimization
1744 Pack structure members together without holes
1747 Common RejectNegative Joined UInteger Optimization
1748 -fpack-struct=<number> Set initial maximum structure member alignment
1751 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1752 Return small aggregates in memory, not registers
1755 Common Report Var(flag_peel_loops) Optimization
1756 Perform loop peeling
1759 Common Report Var(flag_no_peephole,0) Optimization
1760 Enable machine specific peephole optimizations
1763 Common Report Var(flag_peephole2) Optimization
1764 Enable an RTL peephole pass before sched2
1767 Common Report Var(flag_pic,2) Negative(fPIE)
1768 Generate position-independent code if possible (large mode)
1771 Common Report Var(flag_pie,2) Negative(fpic)
1772 Generate position-independent code for executables if possible (large mode)
1775 Common Report Var(flag_pic,1) Negative(fpie)
1776 Generate position-independent code if possible (small mode)
1779 Common Report Var(flag_pie,1) Negative(fPIC)
1780 Generate position-independent code for executables if possible (small mode)
1783 Common Joined RejectNegative Var(common_deferred_options) Defer
1784 Specify a plugin to load
1787 Common Joined RejectNegative Var(common_deferred_options) Defer
1788 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1790 fpredictive-commoning
1791 Common Report Var(flag_predictive_commoning) Optimization
1792 Run predictive commoning optimization.
1794 fprefetch-loop-arrays
1795 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1796 Generate prefetch instructions, if available, for arrays in loops
1799 Common Report Var(profile_flag)
1800 Enable basic program profiling code
1803 Common Report Var(profile_arc_flag)
1804 Insert arc-based program profiling code
1807 Common Joined RejectNegative Var(profile_data_prefix)
1808 Set the top-level directory for storing the profile data.
1809 The default is 'pwd'.
1812 Common Report Var(flag_profile_correction)
1813 Enable correction of flow inconsistent profile data input
1817 Enable common options for generating profile info for profile feedback directed optimizations
1820 Common Joined RejectNegative
1821 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1824 Common Var(flag_profile_use)
1825 Enable common options for performing profile feedback directed optimizations
1828 Common Joined RejectNegative
1829 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1832 Common Report Var(flag_profile_values)
1833 Insert code to profile values of expressions
1836 Common Report Var(profile_report)
1837 Report on consistency of profile
1839 fprofile-reorder-functions
1840 Common Report Var(flag_profile_reorder_functions)
1841 Enable function reordering that improves code placement
1844 Common Var(common_deferred_options) Defer
1847 Common Joined RejectNegative Var(common_deferred_options) Defer
1848 -frandom-seed=<string> Make compile reproducible using <string>
1850 ; This switch causes the command line that was used to create an
1851 ; object file to be recorded into the object file. The exact format
1852 ; of this recording is target and binary file format dependent.
1853 ; It is related to the -fverbose-asm switch, but that switch only
1854 ; records information in the assembler output file as comments, so
1855 ; they never reach the object file.
1856 frecord-gcc-switches
1857 Common Report Var(flag_record_gcc_switches)
1858 Record gcc command line switches in the object file.
1861 Common Report Var(flag_pcc_struct_return,0) Optimization
1862 Return small aggregates in registers
1866 Does nothing. Preserved for backward compatibility.
1869 Common Report Var(flag_lifetime_dse) Init(1) Optimization
1870 Tell DSE that the storage for a C++ object is dead when the constructor
1871 starts and when the destructor finishes.
1873 flive-range-shrinkage
1874 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
1875 Relief of register pressure through live range shrinkage
1878 Common Report Var(flag_rename_registers) Init(2) Optimization
1879 Perform a register renaming optimization pass
1882 Common Report Var(flag_schedule_fusion) Init(2) Optimization
1883 Perform a target dependent instruction fusion optimization pass
1886 Common Report Var(flag_reorder_blocks) Optimization
1887 Reorder basic blocks to improve code placement
1889 freorder-blocks-and-partition
1890 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1891 Reorder basic blocks and partition into hot and cold sections
1894 Common Report Var(flag_reorder_functions) Optimization
1895 Reorder functions to improve code placement
1897 frerun-cse-after-loop
1898 Common Report Var(flag_rerun_cse_after_loop) Optimization
1899 Add a common subexpression elimination pass after loop optimizations
1903 Does nothing. Preserved for backward compatibility.
1906 Common Report Var(flag_rounding_math) Optimization SetByCombined
1907 Disable optimizations that assume default FP rounding behavior
1910 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1911 Enable scheduling across basic blocks
1914 Common Report Var(flag_sched_pressure) Init(0) Optimization
1915 Enable register pressure sensitive insn scheduling
1918 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1919 Allow speculative motion of non-loads
1922 Common Report Var(flag_schedule_speculative_load) Optimization
1923 Allow speculative motion of some loads
1925 fsched-spec-load-dangerous
1926 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1927 Allow speculative motion of more loads
1930 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1931 -fsched-verbose=<number> Set the verbosity level of the scheduler
1933 fsched2-use-superblocks
1934 Common Report Var(flag_sched2_use_superblocks) Optimization
1935 If scheduling post reload, do superblock scheduling
1939 Does nothing. Preserved for backward compatibility.
1942 Common Report Var(flag_schedule_insns) Optimization
1943 Reschedule instructions before register allocation
1946 Common Report Var(flag_schedule_insns_after_reload) Optimization
1947 Reschedule instructions after register allocation
1949 ; This flag should be on when a target implements non-trivial
1950 ; scheduling hooks, maybe saving some information for its own sake.
1951 ; On IA64, for example, this is used for correct bundling.
1952 fselective-scheduling
1953 Common Report Var(flag_selective_scheduling) Optimization
1954 Schedule instructions using selective scheduling algorithm
1956 fselective-scheduling2
1957 Common Report Var(flag_selective_scheduling2) Optimization
1958 Run selective scheduling after reload
1960 fsel-sched-pipelining
1961 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1962 Perform software pipelining of inner loops during selective scheduling
1964 fsel-sched-pipelining-outer-loops
1965 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1966 Perform software pipelining of outer loops during selective scheduling
1968 fsel-sched-reschedule-pipelined
1969 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1970 Reschedule pipelined regions without pipelining
1972 fsemantic-interposition
1973 Common Report Var(flag_semantic_interposition) Init(1)
1974 Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker
1976 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1977 ; of stalled insns into the ready list.
1978 fsched-stalled-insns
1979 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1980 Allow premature scheduling of queued insns
1982 fsched-stalled-insns=
1983 Common RejectNegative Joined UInteger Optimization
1984 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1986 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1987 ; be examined for a dependency on a stalled insn that is candidate for
1988 ; premature removal from the queue of stalled insns into the ready list (has
1989 ; an effect only if the flag 'sched_stalled_insns' is set).
1990 fsched-stalled-insns-dep
1991 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1992 Set dependence distance checking in premature scheduling of queued insns
1994 fsched-stalled-insns-dep=
1995 Common RejectNegative Joined UInteger Optimization
1996 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1998 fsched-group-heuristic
1999 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
2000 Enable the group heuristic in the scheduler
2002 fsched-critical-path-heuristic
2003 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
2004 Enable the critical path heuristic in the scheduler
2006 fsched-spec-insn-heuristic
2007 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
2008 Enable the speculative instruction heuristic in the scheduler
2010 fsched-rank-heuristic
2011 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
2012 Enable the rank heuristic in the scheduler
2014 fsched-last-insn-heuristic
2015 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
2016 Enable the last instruction heuristic in the scheduler
2018 fsched-dep-count-heuristic
2019 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
2020 Enable the dependent count heuristic in the scheduler
2023 Common Report Var(flag_section_anchors) Optimization
2024 Access data in the same section from shared anchor points
2028 Does nothing. Preserved for backward compatibility.
2032 Does nothing. Preserved for backward compatibility.
2035 Common Report Var(flag_ree) Init(0)
2036 Turn on Redundant Extensions Elimination pass.
2039 Common Report Var(flag_show_column) Init(1)
2040 Show column numbers in diagnostics, when available. Default on
2043 Common Report Var(flag_shrink_wrap) Optimization
2044 Emit function prologues only before parts of the function that need it,
2045 rather than at the top of the function.
2048 Common Report Var(flag_signaling_nans) Optimization SetByCombined
2049 Disable optimizations observable by IEEE signaling NaNs
2052 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
2053 Disable floating point optimizations that ignore the IEEE signedness of zero
2055 fsingle-precision-constant
2056 Common Report Var(flag_single_precision_constant) Optimization
2057 Convert floating point constants to single precision constants
2059 fsplit-ivs-in-unroller
2060 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
2061 Split lifetimes of induction variables when loops are unrolled
2064 Common Report Var(flag_split_stack) Init(-1)
2065 Generate discontiguous stack frames
2068 Common Report Var(flag_split_wide_types) Optimization
2069 Split wide types into independent registers
2072 Common Report Var(flag_ssa_phiopt) Optimization
2073 Optimize conditional patterns using SSA PHI nodes
2076 Common Report Var(flag_stdarg_opt) Init(1) Optimization
2077 Optimize amount of stdarg registers saved to stack at start of function
2079 fvariable-expansion-in-unroller
2080 Common Report Var(flag_variable_expansion_in_unroller) Optimization
2081 Apply variable expansion when loops are unrolled
2084 Common Report RejectNegative Joined
2085 -fstack-check=[no|generic|specific] Insert stack checking code into the program
2088 Common Alias(fstack-check=, specific, no)
2089 Insert stack checking code into the program. Same as -fstack-check=specific
2092 Common Var(common_deferred_options) Defer
2094 fstack-limit-register=
2095 Common RejectNegative Joined Var(common_deferred_options) Defer
2096 -fstack-limit-register=<register> Trap if the stack goes past <register>
2098 fstack-limit-symbol=
2099 Common RejectNegative Joined Var(common_deferred_options) Defer
2100 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
2103 Common Report Var(flag_stack_protect, 1)
2104 Use propolice as a stack protection method
2106 fstack-protector-all
2107 Common Report RejectNegative Var(flag_stack_protect, 2)
2108 Use a stack protection method for every function
2110 fstack-protector-strong
2111 Common Report RejectNegative Var(flag_stack_protect, 3)
2112 Use a smart stack protection method for certain functions
2114 fstack-protector-explicit
2115 Common Report RejectNegative Var(flag_stack_protect, 4)
2116 Use stack protection method only for functions with the stack_protect attribute
2119 Common RejectNegative Var(flag_stack_usage)
2120 Output stack usage information on a per-function basis
2124 Does nothing. Preserved for backward compatibility.
2126 ; Nonzero if we should do (language-dependent) alias analysis.
2127 ; Typically, this analysis will assume that expressions of certain
2128 ; types do not alias expressions of certain other types. Only used
2129 ; if alias analysis (in general) is enabled.
2131 Common Report Var(flag_strict_aliasing) Optimization
2132 Assume strict aliasing rules apply
2135 Common Report Var(flag_strict_overflow) Optimization
2136 Treat signed overflow as undefined
2139 Common Report Var(flag_sync_libcalls) Init(1)
2140 Implement __atomic operations via libcalls to legacy __sync functions
2143 Common Report Var(flag_syntax_only)
2144 Check for syntax errors, then stop
2147 Common Report Var(flag_test_coverage)
2148 Create data files needed by \"gcov\"
2151 Common Report Var(flag_thread_jumps) Optimization
2152 Perform jump threading optimizations
2155 Common Report Var(time_report)
2156 Report the time taken by each compiler pass
2159 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2160 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
2163 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2166 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2169 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2172 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2175 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2178 Common Report Var(flag_toplevel_reorder) Init(2)
2179 Reorder top level functions, variables, and asms
2182 Common Report Var(flag_tracer) Optimization
2183 Perform superblock formation via tail duplication
2185 ; Zero means that floating-point math operations cannot generate a
2186 ; (user-visible) trap. This is the case, for example, in nonstop
2187 ; IEEE 754 arithmetic.
2189 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2190 Assume floating-point operations can trap
2193 Common Report Var(flag_trapv) Optimization
2194 Trap for signed overflow in addition, subtraction and multiplication
2197 Common Report Var(flag_tree_ccp) Optimization
2198 Enable SSA-CCP optimization on trees
2201 Common Report Var(flag_tree_bit_ccp) Optimization
2202 Enable SSA-BIT-CCP optimization on trees
2206 Does nothing. Preserved for backward compatibility.
2209 Common Report Var(flag_tree_ch) Optimization
2210 Enable loop header copying on trees
2212 ftree-coalesce-inlined-vars
2213 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2214 Enable coalescing of copy-related user variables that are inlined
2217 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2218 Enable coalescing of all copy-related user variables
2221 Common Report Var(flag_tree_copyrename) Optimization
2222 Replace SSA temporaries with better names in copies
2225 Common Report Var(flag_tree_copy_prop) Optimization
2226 Enable copy propagation on trees
2228 ftree-store-copy-prop
2230 Does nothing. Preserved for backward compatibility.
2233 Common Report Var(flag_tree_cselim) Init(2) Optimization
2234 Transform condition stores into unconditional ones
2236 ftree-switch-conversion
2237 Common Report Var(flag_tree_switch_conversion) Optimization
2238 Perform conversions of switch initializations.
2241 Common Report Var(flag_tree_dce) Optimization
2242 Enable SSA dead code elimination optimization on trees
2244 ftree-dominator-opts
2245 Common Report Var(flag_tree_dom) Optimization
2246 Enable dominator optimizations
2249 Common Report Var(flag_tree_tail_merge) Optimization
2250 Enable tail merging on trees
2253 Common Report Var(flag_tree_dse) Optimization
2254 Enable dead store elimination
2257 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2258 Enable forward propagation on trees
2261 Common Report Var(flag_tree_fre) Optimization
2262 Enable Full Redundancy Elimination (FRE) on trees
2265 Common Report Var(flag_optimize_strlen) Optimization
2266 Enable string length optimizations on trees
2268 fisolate-erroneous-paths-dereference
2269 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2270 Detect paths that trigger erroneous or undefined behavior due to
2271 dereferencing a null pointer. Isolate those paths from the main control
2272 flow and turn the statement with erroneous or undefined behavior into a trap.
2274 fisolate-erroneous-paths-attribute
2275 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2276 Detect paths that trigger erroneous or undefined behavior due a null value
2277 being used in a way forbidden by a returns_nonnull or nonnull
2278 attribute. Isolate those paths from the main control flow and turn the
2279 statement with erroneous or undefined behavior into a trap.
2281 ftree-loop-distribution
2282 Common Report Var(flag_tree_loop_distribution) Optimization
2283 Enable loop distribution on trees
2285 ftree-loop-distribute-patterns
2286 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2287 Enable loop distribution for patterns transformed into a library call
2290 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2291 Enable loop invariant motion on trees
2294 Common Alias(floop-interchange)
2295 Enable loop interchange transforms. Same as -floop-interchange
2298 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2299 Create canonical induction variables in loops
2302 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2303 Enable loop optimizations on tree level
2305 ftree-parallelize-loops=
2306 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1) Optimization
2307 Enable automatic parallelization of loops
2310 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2311 Enable hoisting loads from conditional pointers.
2314 Common Report Var(flag_tree_pre) Optimization
2315 Enable SSA-PRE optimization on trees
2318 Common Report Var(flag_tree_partial_pre) Optimization
2319 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2322 Common Report Var(flag_tree_pta) Optimization
2323 Perform function-local points-to analysis on trees.
2326 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2327 Enable reassociation on tree level
2331 Does nothing. Preserved for backward compatibility.
2334 Common Report Var(flag_tree_sink) Optimization
2335 Enable SSA code sinking on trees
2338 Common Report Var(flag_tree_slsr) Optimization
2339 Perform straight-line strength reduction
2342 Common Report Var(flag_tree_sra) Optimization
2343 Perform scalar replacement of aggregates
2346 Common Report Var(flag_tree_ter) Optimization
2347 Replace temporary expressions in the SSA->normal pass
2350 Common Report Var(flag_tree_live_range_split) Optimization
2351 Perform live range splitting during the SSA->normal pass
2354 Common Report Var(flag_tree_vrp) Init(0) Optimization
2355 Perform Value Range Propagation on trees
2358 Common Report Var(flag_unit_at_a_time) Init(1)
2359 Compile whole compilation unit at a time
2362 Common Report Var(flag_unroll_loops) Optimization
2363 Perform loop unrolling when iteration count is known
2366 Common Report Var(flag_unroll_all_loops) Optimization
2367 Perform loop unrolling for all loops
2369 ; Nonzero means that loop optimizer may assume that the induction variables
2370 ; that control loops do not overflow and that the loops with nontrivial
2371 ; exit condition are not infinite
2372 funsafe-loop-optimizations
2373 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2374 Allow loop optimizations to assume that the loops behave in normal way
2377 Common Report Var(flag_associative_math) SetByCombined Optimization
2378 Allow optimization for floating-point arithmetic which may change the
2379 result of the operation due to rounding.
2382 Common Report Var(flag_reciprocal_math) SetByCombined Optimization
2383 Same as -fassociative-math for expressions which include division.
2385 ; Nonzero means that unsafe floating-point math optimizations are allowed
2386 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2387 ; are allowed to assume that their arguments and results are "normal"
2388 ; (e.g., nonnegative for SQRT).
2389 funsafe-math-optimizations
2390 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2391 Allow math optimizations that may violate IEEE or ISO standards
2394 Common Report Var(flag_unswitch_loops) Optimization
2395 Perform loop unswitching
2398 Common Report Var(flag_unwind_tables) Optimization
2399 Just generate unwind tables for exception handling
2402 Common Driver Negative(fuse-ld=gold)
2403 Use the bfd linker instead of the default linker
2406 Common Driver Negative(fuse-ld=bfd)
2407 Use the gold linker instead of the default linker
2410 Common Undocumented Var(flag_use_linker_plugin)
2412 ; Positive if we should track variables, negative if we should run
2413 ; the var-tracking pass only to discard debug annotations, zero if
2414 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2415 ; will be set according to optimize, debug_info_level and debug_hooks
2416 ; in process_options ().
2418 Common Report Var(flag_var_tracking) Init(2) Optimization
2419 Perform variable tracking
2421 ; Positive if we should track variables at assignments, negative if
2422 ; we should run the var-tracking pass only to discard debug
2423 ; annotations. When flag_var_tracking_assignments ==
2424 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2425 fvar-tracking-assignments
2426 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2427 Perform variable tracking by annotating assignments
2429 ; Nonzero if we should toggle flag_var_tracking_assignments after
2430 ; processing options and computing its default. */
2431 fvar-tracking-assignments-toggle
2432 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2433 Toggle -fvar-tracking-assignments
2435 ; Positive if we should track uninitialized variables, negative if
2436 ; we should run the var-tracking pass only to discard debug
2437 ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
2438 ; will be set according to flag_var_tracking.
2439 fvar-tracking-uninit
2440 Common Report Var(flag_var_tracking_uninit) Optimization
2441 Perform variable tracking and also tag variables that are uninitialized
2444 Common Report Var(flag_tree_vectorize) Optimization
2445 Enable vectorization on trees
2447 ftree-vectorizer-verbose=
2448 Common Joined RejectNegative Ignore
2449 Does nothing. Preserved for backward compatibility.
2451 ftree-loop-vectorize
2452 Common Report Var(flag_tree_loop_vectorize) Optimization
2453 Enable loop vectorization on trees
2456 Common Report Var(flag_tree_slp_vectorize) Optimization
2457 Enable basic block vectorization (SLP) on trees
2460 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT) Optimization
2461 Specifies the cost model for vectorization
2464 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED) Optimization
2465 Specifies the vectorization cost model for code marked with a simd directive
2468 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2471 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2474 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2477 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2480 Common RejectNegative Alias(fvect-cost-model=,dynamic)
2481 Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
2484 Common RejectNegative Alias(fvect-cost-model=,unlimited)
2485 Enables the unlimited vectorizer cost model. Preserved for backward compatibility.
2487 ftree-vect-loop-version
2489 Does nothing. Preserved for backward compatibility.
2492 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2493 Enable copy propagation of scalar-evolution information.
2495 ; -fverbose-asm causes extra commentary information to be produced in
2496 ; the generated assembly code (to make it more readable). This option
2497 ; is generally only of use to those who actually need to read the
2498 ; generated assembly code (perhaps while debugging the compiler itself).
2499 ; -fno-verbose-asm, the default, causes the extra information
2500 ; to not be added and is useful when comparing two assembler files.
2502 Common Report Var(flag_verbose_asm)
2503 Add extra commentary to assembler output
2506 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2507 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2510 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2513 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2516 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2519 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2522 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2525 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2526 Validate vtable pointers before using them.
2529 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2532 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2535 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2538 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2541 Common Var(flag_vtv_counts)
2542 Output vtable verification counters.
2545 Common Var(flag_vtv_debug)
2546 Output vtable verification pointer sets information.
2549 Common Report Var(flag_value_profile_transformations) Optimization
2550 Use expression value profiles in optimizations
2553 Common Report Var(flag_web) Init(2) Optimization
2554 Construct webs and split unrelated uses of single variable
2556 ftree-builtin-call-dce
2557 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2558 Enable conditional dead code elimination for builtin calls
2561 Common Report Var(flag_whole_program) Init(0)
2562 Perform whole program optimizations
2565 Common Report Var(flag_wrapv) Optimization
2566 Assume signed arithmetic overflow wraps around
2568 fzero-initialized-in-bss
2569 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2570 Put zero initialized data in the bss section
2573 Common JoinedOrMissing
2574 Generate debug information in default format
2577 Common JoinedOrMissing Negative(gdwarf)
2578 Generate debug information in COFF format
2581 Common JoinedOrMissing Negative(gdwarf-)
2582 Generate debug information in default version of DWARF format
2585 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2586 Generate debug information in DWARF v2 (or later) format
2589 Common JoinedOrMissing
2590 Generate debug information in default extended format
2593 Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2594 Don't generate DWARF pubnames and pubtypes sections.
2597 Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2598 Generate DWARF pubnames and pubtypes sections.
2601 Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2602 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2604 gno-record-gcc-switches
2605 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2606 Don't record gcc command line switches in DWARF DW_AT_producer.
2608 grecord-gcc-switches
2609 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2610 Record gcc command line switches in DWARF DW_AT_producer.
2613 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2614 Don't generate debug information in separate .dwo files
2617 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2618 Generate debug information in separate .dwo files
2621 Common JoinedOrMissing Negative(gstabs+)
2622 Generate debug information in STABS format
2625 Common JoinedOrMissing Negative(gvms)
2626 Generate debug information in extended STABS format
2629 Common RejectNegative Var(dwarf_strict,0) Init(0)
2630 Emit DWARF additions beyond selected version
2633 Common Report RejectNegative Var(dwarf_strict,1)
2634 Don't emit DWARF additions beyond selected version
2637 Common Report Var(flag_gtoggle)
2638 Toggle debug information generation
2641 Common JoinedOrMissing Negative(gxcoff)
2642 Generate debug information in VMS format
2645 Common JoinedOrMissing Negative(gxcoff+)
2646 Generate debug information in XCOFF format
2649 Common JoinedOrMissing Negative(gcoff)
2650 Generate debug information in extended XCOFF format
2653 Name(compressed_debug_sections) Type(int)
2655 ; Since -gz= is completely handled in specs, the values aren't used and we
2656 ; assign arbitrary constants.
2658 Enum(compressed_debug_sections) String(none) Value(0)
2661 Enum(compressed_debug_sections) String(zlib) Value(1)
2664 Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
2668 Generate compressed debug sections
2671 Common Driver Joined Enum(compressed_debug_sections)
2672 -gz=<format> Generate compressed debug sections in format <format>
2675 Driver Joined Separate
2678 Common Joined Var(plugindir_string) Init(0)
2679 -iplugindir=<dir> Set <dir> to be the default plugin directory
2682 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2683 -imultiarch <dir> Set <dir> to be the multiarch include subdirectory
2686 Driver Joined Separate
2691 no-canonical-prefixes
2704 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2705 -o <file> Place output into <file>
2708 Common Var(profile_flag)
2709 Enable function profiling
2712 Driver Var(pass_exit_codes)
2715 Common Alias(Wpedantic)
2718 Common Var(flag_pedantic_errors)
2719 Like -pedantic but issue them as errors
2725 Driver Var(use_pipes)
2728 Driver JoinedOrMissing Var(print_file_name)
2730 print-libgcc-file-name
2733 print-multi-directory
2734 Driver Var(print_multi_directory)
2737 Driver Var(print_multi_lib)
2739 print-multi-os-directory
2740 Driver Var(print_multi_os_directory)
2743 Driver Var(print_multiarch)
2746 Driver JoinedOrMissing Var(print_prog_name)
2749 Driver Var(print_search_dirs)
2752 Driver Var(print_sysroot)
2754 print-sysroot-headers-suffix
2755 Driver Var(print_sysroot_headers_suffix)
2758 Common Var(quiet_flag) RejectDriver
2759 Do not display functions compiled or elapsed time
2777 Driver Var(report_times)
2780 Driver JoinedOrMissing
2783 Driver Joined Separate
2787 ; C option, but driver must not handle as "-u ndef".
2790 Common Driver Var(verbose_flag)
2791 Enable verbose output
2794 Common Var(version_flag) RejectDriver
2795 Display the compiler's version
2798 Common Var(inhibit_warnings)
2802 Driver Separate Var(wrapper_string)
2805 Driver Joined Separate
2808 Driver RejectNegative Negative(pie)
2809 Create a shared library
2815 Driver Separate Alias(specs=)
2828 ; Documented for Fortran, but always accepted by driver.
2835 ; Documented for Go, but always accepted by driver.
2853 Driver RejectNegative Negative(shared)
2854 Create a position independent executable
2857 Driver Joined Separate
2860 Common Report Var(flag_ipa_ra) Optimization
2861 Use caller save register across calls if possible
2863 ; This comment is to ensure we retain the blank line above.