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
836 ; (set in c_common_post_options).
838 ; Additional positive integers will be assigned as new versions of
839 ; the ABI become the default version of the ABI.
841 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(0)
842 The version of the C++ ABI in use
844 faggressive-loop-optimizations
845 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
846 Aggressively optimize loops using language constraints
849 Common Report Var(align_functions,0) Optimization UInteger
850 Align the start of functions
853 Common RejectNegative Joined UInteger Var(align_functions)
856 Common Report Var(align_jumps,0) Optimization UInteger
857 Align labels which are only reached by jumping
860 Common RejectNegative Joined UInteger Var(align_jumps)
863 Common Report Var(align_labels,0) Optimization UInteger
867 Common RejectNegative Joined UInteger Var(align_labels)
870 Common Report Var(align_loops,0) Optimization UInteger
871 Align the start of loops
874 Common RejectNegative Joined UInteger Var(align_loops)
878 Does nothing. Preserved for backward compatibility.
882 Does nothing. Preserved for backward compatibility.
884 fargument-noalias-global
886 Does nothing. Preserved for backward compatibility.
888 fargument-noalias-anything
890 Does nothing. Preserved for backward compatibility.
893 Common Driver Report Joined
894 Select what to sanitize
897 Common Joined RejectNegative Var(common_deferred_options) Defer
898 -fasan-shadow-offset=<number> Use custom shadow memory offset.
901 Common Joined RejectNegative Var(common_deferred_options) Defer
902 -fsanitize-sections=<sec1,sec2,...> Sanitize global variables
903 in user-defined sections.
907 After diagnosing undefined behavior attempt to continue execution
911 This switch is deprecated; use -fsanitize-recover= instead
913 fsanitize-undefined-trap-on-error
914 Common Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
915 Use trap instead of a library function for undefined behavior sanitization
917 fasynchronous-unwind-tables
918 Common Report Var(flag_asynchronous_unwind_tables) Optimization
919 Generate unwind tables that are exact at each instruction boundary
922 Common Report Var(flag_auto_inc_dec) Init(1) Optimization
923 Generate auto-inc/dec instructions
926 Common Report Var(flag_auto_profile)
927 Use sample profile information for call graph node weights. The default
928 profile file is fbdata.afdo in 'pwd'.
931 Common Joined RejectNegative Var(auto_profile_file)
932 Use sample profile information for call graph node weights. The profile
933 file is specified in the argument.
935 ; -fcheck-bounds causes gcc to generate array bounds checks.
936 ; For C, C++ and ObjC: defaults off.
937 ; For Java: defaults to on.
938 ; For Fortran: defaults to off.
940 Common Report Var(flag_bounds_check)
941 Generate code to check bounds before indexing arrays
944 Common Report Var(flag_branch_on_count_reg) Optimization
945 Replace add, compare, branch with branch on count register
947 fbranch-probabilities
948 Common Report Var(flag_branch_probabilities) Optimization
949 Use profiling information for branch probabilities
951 fbranch-target-load-optimize
952 Common Report Var(flag_branch_target_load_optimize) Optimization
953 Perform branch target load optimization before prologue / epilogue threading
955 fbranch-target-load-optimize2
956 Common Report Var(flag_branch_target_load_optimize2) Optimization
957 Perform branch target load optimization after prologue / epilogue threading
960 Common Report Var(flag_btr_bb_exclusive) Optimization
961 Restrict target load migration not to re-use registers in any basic block
964 Common Joined RejectNegative Var(common_deferred_options) Defer
965 -fcall-saved-<register> Mark <register> as being preserved across functions
968 Common Joined RejectNegative Var(common_deferred_options) Defer
969 -fcall-used-<register> Mark <register> as being corrupted by function calls
971 ; Nonzero for -fcaller-saves: allocate values in regs that need to
972 ; be saved across function calls, if that produces overall better code.
973 ; Optional now, so people can test it.
975 Common Report Var(flag_caller_saves) Optimization
976 Save registers around function calls
979 Common Report Var(flag_check_data_deps)
980 Compare the results of several data dependence analyzers.
983 Common Var(flag_check_new)
984 Check the return value of new in C++
986 fcombine-stack-adjustments
987 Common Report Var(flag_combine_stack_adjustments) Optimization
988 Looks for opportunities to reduce stack adjustments and stack references.
991 Common Report Var(flag_no_common,0)
992 Do not put uninitialized globals in the common section
996 ; Converted by the driver to -fcompare-debug= options.
999 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
1000 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
1002 fcompare-debug-second
1003 Common Driver RejectNegative Var(flag_compare_debug)
1004 Run only the second compilation of -fcompare-debug
1007 Common Report Var(flag_compare_elim_after_reload) Optimization
1008 Perform comparison elimination after register allocation has finished
1011 Common Var(flag_conserve_stack) Optimization
1012 Do not perform optimizations increasing noticeably stack usage
1015 Common Report Var(flag_cprop_registers) Optimization
1016 Perform a register copy-propagation optimization pass
1019 Common Report Var(flag_crossjumping) Optimization
1020 Perform cross-jumping optimization
1023 Common Report Var(flag_cse_follow_jumps) Optimization
1024 When running CSE, follow jumps to their targets
1028 Does nothing. Preserved for backward compatibility.
1031 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
1032 Omit range reduction step when performing complex division
1035 Common Report Var(flag_cx_fortran_rules) Optimization
1036 Complex multiplication and division follow Fortran rules
1039 Common Report Var(flag_data_sections)
1040 Place data items into their own section
1043 Common Report Var(common_deferred_options) Defer
1044 List all available debugging counters with their limits and counts.
1047 Common RejectNegative Joined Var(common_deferred_options) Defer
1048 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
1051 Common Joined RejectNegative Var(common_deferred_options) Defer
1052 Map one directory name to another in debug information
1054 fdebug-types-section
1055 Common Report Var(flag_debug_types_section) Init(0)
1056 Output .debug_types section when using DWARF v4 debuginfo.
1058 ; Nonzero for -fdefer-pop: don't pop args after each function call
1059 ; instead save them up to pop many calls' args with one insns.
1061 Common Report Var(flag_defer_pop) Optimization
1062 Defer popping functions args from stack until later
1065 Common Report Var(flag_delayed_branch) Optimization
1066 Attempt to fill delay slots of branch instructions
1068 fdelete-dead-exceptions
1069 Common Report Var(flag_delete_dead_exceptions) Init(0) Optimization
1070 Delete dead instructions that may throw exceptions
1072 fdelete-null-pointer-checks
1073 Common Report Var(flag_delete_null_pointer_checks) Init(-1) Optimization
1074 Delete useless null pointer checks
1076 fdevirtualize-at-ltrans
1077 Common Report Var(flag_ltrans_devirtualize)
1078 Stream extra data to support more aggressive devirtualization in LTO local transformation mode
1080 fdevirtualize-speculatively
1081 Common Report Var(flag_devirtualize_speculatively) Optimization
1082 Perform speculative devirtualization
1085 Common Report Var(flag_devirtualize) Optimization
1086 Try to convert virtual calls to direct ones.
1088 fdiagnostics-show-location=
1089 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1090 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
1092 ; Required for these enum values.
1097 Name(diagnostic_prefixing_rule) Type(int)
1100 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1103 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1105 fdiagnostics-show-caret
1106 Common Var(flag_diagnostics_show_caret) Init(1)
1107 Show the source line with a caret indicating the column
1110 Common Alias(fdiagnostics-color=,always,never)
1114 Driver Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1115 -fdiagnostics-color=[never|always|auto] Colorize diagnostics
1117 ; Required for these enum values.
1122 Name(diagnostic_color_rule) Type(int)
1125 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1128 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1131 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1133 fdiagnostics-show-option
1134 Common Var(flag_diagnostics_show_option) Init(1)
1135 Amend appropriate diagnostic messages with the command line option that controls them
1138 Common Joined RejectNegative Var(common_deferred_options) Defer
1139 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1142 Common Joined RejectNegative Var(common_deferred_options) Defer
1143 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1146 Common Joined RejectNegative Var(common_deferred_options) Defer
1147 -fdump-<type> Dump various compiler internals to a file
1150 Driver RejectNegative
1153 Common RejectNegative Joined Var(flag_dump_final_insns)
1154 -fdump-final-insns=filename Dump to filename the insns at the end of translation
1157 Common RejectNegative Joined Var(flag_dump_go_spec)
1158 -fdump-go-spec=filename Write all declarations to file as Go code
1161 Common Report Var(flag_dump_noaddr)
1162 Suppress output of addresses in debugging dumps
1165 Common Driver Var(flag_report_bug)
1166 Collect and dump debug information into temporary file if ICE in C/C++
1169 fdump-internal-locations
1170 Common Var(flag_dump_locations) Init(0)
1171 Dump detailed information on GCC's internal representation of source code locations
1174 Common Var(flag_dump_passes) Init(0)
1175 Dump optimization passes
1178 Common Report Var(flag_dump_unnumbered)
1179 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1181 fdump-unnumbered-links
1182 Common Report Var(flag_dump_unnumbered_links)
1183 Suppress output of previous and next insn numbers in debugging dumps
1186 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1187 Enable CFI tables via GAS assembler directives.
1190 Common Report Var(flag_early_inlining) Init(1) Optimization
1191 Perform early inlining
1193 feliminate-dwarf2-dups
1194 Common Report Var(flag_eliminate_dwarf2_dups)
1195 Perform DWARF2 duplicate elimination
1198 Common Report Var(flag_ipa_sra) Init(0) Optimization
1199 Perform interprocedural reduction of aggregates
1201 feliminate-unused-debug-symbols
1202 Common Report Var(flag_debug_only_used_symbols)
1203 Perform unused symbol elimination in debug info
1205 feliminate-unused-debug-types
1206 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1207 Perform unused type elimination in debug info
1209 femit-class-debug-always
1210 Common Report Var(flag_emit_class_debug_always) Init(0)
1211 Do not suppress C++ class debug information.
1214 Common Report Var(flag_exceptions) Optimization
1215 Enable exception handling
1217 fexpensive-optimizations
1218 Common Report Var(flag_expensive_optimizations) Optimization
1219 Perform a number of minor, expensive optimizations
1222 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1223 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1226 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1229 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1232 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1238 Common Var(flag_fat_lto_objects)
1239 Output lto objects containing both the intermediate language and binary output.
1242 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1243 Assume no NaNs or infinities are generated
1246 Common Joined RejectNegative Var(common_deferred_options) Defer
1247 -ffixed-<register> Mark <register> as being unavailable to the compiler
1250 Common Report Var(flag_float_store) Optimization
1251 Don't allocate floats and doubles in extended-precision registers
1255 Does nothing. Preserved for backward compatibility.
1258 Common Report Var(flag_forward_propagate) Optimization
1259 Perform a forward propagation pass on RTL
1262 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST) Optimization
1263 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1266 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1269 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1271 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1273 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1276 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1278 ; Nonzero means don't put addresses of constant functions in registers.
1279 ; Used for compiling the Unix kernel, where strange substitutions are
1280 ; done on the assembly output.
1282 Common Report Var(flag_no_function_cse,0) Optimization
1283 Allow function addresses to be held in registers
1286 Common Report Var(flag_function_sections)
1287 Place each function into its own section
1290 Common Report Var(flag_gcse) Optimization
1291 Perform global common subexpression elimination
1294 Common Report Var(flag_gcse_lm) Init(1) Optimization
1295 Perform enhanced load motion during global common subexpression elimination
1298 Common Report Var(flag_gcse_sm) Init(0) Optimization
1299 Perform store motion after global common subexpression elimination
1302 Common Report Var(flag_gcse_las) Init(0) Optimization
1303 Perform redundant load after store elimination in global common subexpression
1307 Common Report Var(flag_gcse_after_reload) Optimization
1308 Perform global common subexpression elimination after register allocation
1311 ; This option is not documented yet as its semantics will change.
1313 Common Report Var(flag_graphite) Optimization
1314 Enable in and out of Graphite representation
1317 Common Report Var(flag_graphite_identity) Optimization
1318 Enable Graphite Identity transformation
1320 fhoist-adjacent-loads
1321 Common Report Var(flag_hoist_adjacent_loads) Optimization
1322 Enable hoisting adjacent loads to encourage generating conditional move
1325 floop-parallelize-all
1326 Common Report Var(flag_loop_parallelize_all) Optimization
1327 Mark all loops as parallel
1330 Common Report Var(flag_loop_strip_mine) Optimization
1331 Enable Loop Strip Mining transformation
1334 Common Report Var(flag_loop_interchange) Optimization
1335 Enable Loop Interchange transformation
1338 Common Report Var(flag_loop_block) Optimization
1339 Enable Loop Blocking transformation
1341 floop-unroll-and-jam
1342 Common Report Var(flag_loop_unroll_jam) Optimization
1343 Enable Loop Unroll Jam transformation
1346 Common Report Var(flag_tm)
1347 Enable support for GNU transactional memory
1350 Common Report Var(flag_gnu_unique) Init(1)
1351 Use STB_GNU_UNIQUE if supported by the assembler
1355 Does nothing. Preserved for backward compatibility.
1358 Common Report Var(flag_loop_optimize_isl) Optimization
1359 Enable the ISL based loop nest optimizer
1361 fstrict-volatile-bitfields
1362 Common Report Var(flag_strict_volatile_bitfields) Init(-1) Optimization
1363 Force bitfield accesses to match their type width
1365 fguess-branch-probability
1366 Common Report Var(flag_guess_branch_prob) Optimization
1367 Enable guessing of branch probabilities
1369 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1370 ; Generate position-independent code for executables if possible
1371 ; On SVR4 targets, it also controls whether or not to emit a
1372 ; string identifying the compiler.
1374 Common Report Var(flag_no_ident,0)
1375 Process #ident directives
1378 Common Report Var(flag_if_conversion) Optimization
1379 Perform conversion of conditional jumps to branchless equivalents
1382 Common Report Var(flag_if_conversion2) Optimization
1383 Perform conversion of conditional jumps to conditional execution
1386 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL) Optimization
1387 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1390 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1393 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1396 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1399 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1401 ftree-loop-if-convert
1402 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1403 Convert conditional jumps in innermost loops to branchless equivalents
1405 ftree-loop-if-convert-stores
1406 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1407 Also if-convert conditional jumps containing memory writes
1409 ; -finhibit-size-directive inhibits output of .size for ELF.
1410 ; This is used only for compiling crtstuff.c,
1411 ; and it may be extended to other effects
1412 ; needed for crtstuff.c on other systems.
1413 finhibit-size-directive
1414 Common Report Var(flag_inhibit_size_directive)
1415 Do not generate .size directives
1418 Common Report Var(flag_indirect_inlining) Optimization
1419 Perform indirect inlining
1421 ; General flag to enable inlining. Specifying -fno-inline will disable
1422 ; all inlining apart from always-inline functions.
1424 Common Report Var(flag_no_inline,0) Init(0) Optimization
1425 Enable inlining of function declared \"inline\", disabling disables all inlining
1427 finline-small-functions
1428 Common Report Var(flag_inline_small_functions) Optimization
1429 Integrate functions into their callers when code size is known not to grow
1432 Common Report Var(flag_inline_functions) Optimization
1433 Integrate functions not declared \"inline\" into their callers when profitable
1435 finline-functions-called-once
1436 Common Report Var(flag_inline_functions_called_once) Optimization
1437 Integrate functions only required by their single caller
1440 Common RejectNegative Joined Alias(finline-limit=)
1443 Common RejectNegative Joined UInteger
1444 -finline-limit=<number> Limit the size of inlined functions to <number>
1447 Common Report Var(flag_inline_atomics) Init(1) Optimization
1448 Inline __atomic operations when a lock free instruction sequence is available.
1450 finstrument-functions
1451 Common Report Var(flag_instrument_function_entry_exit)
1452 Instrument function entry and exit with profiling calls
1454 finstrument-functions-exclude-function-list=
1455 Common RejectNegative Joined
1456 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1458 finstrument-functions-exclude-file-list=
1459 Common RejectNegative Joined
1460 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1463 Common Report Var(flag_ipa_cp) Optimization
1464 Perform interprocedural constant propagation
1467 Common Report Var(flag_ipa_cp_clone) Optimization
1468 Perform cloning to make Interprocedural constant propagation stronger
1471 Common Report Var(flag_ipa_cp_alignment) Optimization
1472 Perform alignment discovery and propagation to make Interprocedural constant propagation stronger
1475 Common Report Var(flag_ipa_profile) Init(0) Optimization
1476 Perform interprocedural profile propagation
1479 Common Report Var(flag_ipa_pta) Init(0) Optimization
1480 Perform interprocedural points-to analysis
1483 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1484 Discover pure and const functions
1487 Common Report Var(flag_ipa_icf) Optimization
1488 Perform Identical Code Folding for functions and read-only variables
1491 Common Report Var(flag_ipa_icf_functions) Optimization
1492 Perform Identical Code Folding for functions
1495 Common Report Var(flag_ipa_icf_variables)
1496 Perform Identical Code Folding for variables
1499 Common Report Var(flag_ipa_reference) Init(0) Optimization
1500 Discover readonly and non addressable static variables
1504 Does nothing. Preserved for backward compatibility.
1508 Does nothing. Preserved for backward compatibility.
1511 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB) Optimization
1512 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1515 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1518 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1521 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1524 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT) Optimization
1525 -fira-region=[one|all|mixed] Set regions for IRA
1528 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1531 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1534 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1537 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1540 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1541 Use IRA based register pressure calculation
1542 in RTL hoist optimizations.
1545 Common Report Var(flag_ira_loop_pressure) Optimization
1546 Use IRA based register pressure calculation
1547 in RTL loop optimizations.
1549 fira-share-save-slots
1550 Common Report Var(flag_ira_share_save_slots) Init(1) Optimization
1551 Share slots for saving different hard registers.
1553 fira-share-spill-slots
1554 Common Report Var(flag_ira_share_spill_slots) Init(1) Optimization
1555 Share stack slots for spilled pseudo-registers.
1558 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1559 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1562 Common Report Var(flag_ivopts) Init(1) Optimization
1563 Optimize induction variables on trees
1566 Common Var(flag_jump_tables) Init(1) Optimization
1567 Use jump tables for sufficiently large switch statements
1569 fkeep-inline-functions
1570 Common Report Var(flag_keep_inline_functions)
1571 Generate code for functions even if they are fully inlined
1574 Common Report Var(flag_keep_static_consts) Init(1)
1575 Emit static const variables even if they are not used
1578 Common Report Var(flag_leading_underscore) Init(-1)
1579 Give external symbols a leading underscore
1583 Does nothing. Preserved for backward compatibility.
1586 Common Report Var(flag_lra_remat) Optimization
1587 Do CFG-sensitive rematerialization in LRA
1591 Enable link-time optimization.
1594 Common RejectNegative Joined Var(flag_lto)
1595 Link-time optimization with number of parallel jobs or jobserver.
1598 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1601 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1604 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1607 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1610 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1613 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1616 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1617 Specify the algorithm to partition symbols and vars at linktime
1619 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1620 flto-compression-level=
1621 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1622 -flto-compression-level=<number> Use zlib compression level <number> for IL
1624 flto-odr-type-merging
1625 Common Report Var(flag_lto_odr_type_mering) Init(1)
1626 Merge C++ types using One Definition Rule
1629 Common Report Var(flag_lto_report) Init(0)
1630 Report various link-time optimization statistics
1633 Common Report Var(flag_lto_report_wpa) Init(0)
1634 Report various link-time optimization statistics for WPA only
1637 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1638 Set errno after built-in math functions
1641 Common Joined RejectNegative UInteger Var(flag_max_errors)
1642 -fmax-errors=<number> Maximum number of errors to report
1645 Common Report Var(mem_report)
1646 Report on permanent memory allocation
1649 Common Report Var(mem_report_wpa)
1650 Report on permanent memory allocation in WPA only
1652 ; This will attempt to merge constant section constants, if 1 only
1653 ; string constants and constants from constant pool, if 2 also constant
1655 fmerge-all-constants
1656 Common Report Var(flag_merge_constants,2) Init(1)
1657 Attempt to merge identical constants and constant variables
1660 Common Report Var(flag_merge_constants,1)
1661 Attempt to merge identical constants across compilation units
1663 fmerge-debug-strings
1664 Common Report Var(flag_merge_debug_strings) Init(1)
1665 Attempt to merge identical debug strings across compilation units
1668 Common RejectNegative Joined UInteger
1669 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1672 Common Report Var(flag_modulo_sched) Optimization
1673 Perform SMS based modulo scheduling before the first scheduling pass
1675 fmodulo-sched-allow-regmoves
1676 Common Report Var(flag_modulo_sched_allow_regmoves) Optimization
1677 Perform SMS based modulo scheduling with register moves allowed
1679 fmove-loop-invariants
1680 Common Report Var(flag_move_loop_invariants) Optimization
1681 Move loop invariant computations out of loops
1684 Common Var(flag_dce) Init(1) Optimization
1685 Use the RTL dead code elimination pass
1688 Common Var(flag_dse) Init(1) Optimization
1689 Use the RTL dead store elimination pass
1691 freschedule-modulo-scheduled-loops
1692 Common Report Var(flag_resched_modulo_sched) Optimization
1693 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1695 fnon-call-exceptions
1696 Common Report Var(flag_non_call_exceptions) Optimization
1697 Support synchronous non-call exceptions
1700 Common Driver Joined MissingArgError(options or targets missing after %qs)
1701 -foffload=<targets>=<options> Specify offloading targets and options for them
1704 Common Joined RejectNegative Enum(offload_abi) Var(flag_offload_abi) Init(OFFLOAD_ABI_UNSET)
1705 -foffload-abi=[lp64|ilp32] Set the ABI to use in an offload compiler
1708 Name(offload_abi) Type(enum offload_abi) UnknownError(unknown offload ABI %qs)
1711 Enum(offload_abi) String(ilp32) Value(OFFLOAD_ABI_ILP32)
1714 Enum(offload_abi) String(lp64) Value(OFFLOAD_ABI_LP64)
1717 Common Report Var(flag_omit_frame_pointer) Optimization
1718 When possible do not generate stack frames
1721 Common Report Var(flag_opt_info) Optimization
1722 Enable all optimization info dumps on stderr
1725 Common Joined RejectNegative Var(common_deferred_options) Defer
1726 -fopt-info[-<type>=filename] Dump compiler optimization details
1728 foptimize-register-move
1730 Does nothing. Preserved for backward compatibility.
1732 foptimize-sibling-calls
1733 Common Report Var(flag_optimize_sibling_calls) Optimization
1734 Optimize sibling and tail recursive calls
1737 Common Report Var(flag_partial_inlining) Optimization
1738 Perform partial inlining
1741 Common Report Var(pre_ipa_mem_report)
1742 Report on memory allocation before interprocedural optimization
1744 fpost-ipa-mem-report
1745 Common Report Var(post_ipa_mem_report)
1746 Report on memory allocation before interprocedural optimization
1749 Common Report Var(flag_pack_struct) Optimization
1750 Pack structure members together without holes
1753 Common RejectNegative Joined UInteger Optimization
1754 -fpack-struct=<number> Set initial maximum structure member alignment
1757 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1758 Return small aggregates in memory, not registers
1761 Common Report Var(flag_peel_loops) Optimization
1762 Perform loop peeling
1765 Common Report Var(flag_no_peephole,0) Optimization
1766 Enable machine specific peephole optimizations
1769 Common Report Var(flag_peephole2) Optimization
1770 Enable an RTL peephole pass before sched2
1773 Common Report Var(flag_pic,2) Negative(fPIE)
1774 Generate position-independent code if possible (large mode)
1777 Common Report Var(flag_pie,2) Negative(fpic)
1778 Generate position-independent code for executables if possible (large mode)
1781 Common Report Var(flag_pic,1) Negative(fpie)
1782 Generate position-independent code if possible (small mode)
1785 Common Report Var(flag_pie,1) Negative(fPIC)
1786 Generate position-independent code for executables if possible (small mode)
1789 Common Report Var(flag_plt) Init(1) Optimization
1790 Use PLT for PIC calls (-fno-plt: load the address from GOT at call site)
1793 Common Joined RejectNegative Var(common_deferred_options) Defer
1794 Specify a plugin to load
1797 Common Joined RejectNegative Var(common_deferred_options) Defer
1798 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1800 fpredictive-commoning
1801 Common Report Var(flag_predictive_commoning) Optimization
1802 Run predictive commoning optimization.
1804 fprefetch-loop-arrays
1805 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1806 Generate prefetch instructions, if available, for arrays in loops
1809 Common Report Var(profile_flag)
1810 Enable basic program profiling code
1813 Common Report Var(profile_arc_flag)
1814 Insert arc-based program profiling code
1817 Common Joined RejectNegative Var(profile_data_prefix)
1818 Set the top-level directory for storing the profile data.
1819 The default is 'pwd'.
1822 Common Report Var(flag_profile_correction)
1823 Enable correction of flow inconsistent profile data input
1827 Enable common options for generating profile info for profile feedback directed optimizations
1830 Common Joined RejectNegative
1831 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1834 Common Var(flag_profile_use)
1835 Enable common options for performing profile feedback directed optimizations
1838 Common Joined RejectNegative
1839 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1842 Common Report Var(flag_profile_values)
1843 Insert code to profile values of expressions
1846 Common Report Var(profile_report)
1847 Report on consistency of profile
1849 fprofile-reorder-functions
1850 Common Report Var(flag_profile_reorder_functions)
1851 Enable function reordering that improves code placement
1854 Common Var(common_deferred_options) Defer
1857 Common Joined RejectNegative Var(common_deferred_options) Defer
1858 -frandom-seed=<number> Make compile reproducible using <number>
1860 ; This switch causes the command line that was used to create an
1861 ; object file to be recorded into the object file. The exact format
1862 ; of this recording is target and binary file format dependent.
1863 ; It is related to the -fverbose-asm switch, but that switch only
1864 ; records information in the assembler output file as comments, so
1865 ; they never reach the object file.
1866 frecord-gcc-switches
1867 Common Report Var(flag_record_gcc_switches)
1868 Record gcc command line switches in the object file.
1871 Common Report Var(flag_pcc_struct_return,0) Optimization
1872 Return small aggregates in registers
1876 Does nothing. Preserved for backward compatibility.
1879 Common Report Var(flag_lifetime_dse) Init(1) Optimization
1880 Tell DSE that the storage for a C++ object is dead when the constructor
1881 starts and when the destructor finishes.
1883 flive-range-shrinkage
1884 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
1885 Relief of register pressure through live range shrinkage
1888 Common Report Var(flag_rename_registers) Init(2) Optimization
1889 Perform a register renaming optimization pass
1892 Common Report Var(flag_schedule_fusion) Init(2) Optimization
1893 Perform a target dependent instruction fusion optimization pass
1896 Common Report Var(flag_reorder_blocks) Optimization
1897 Reorder basic blocks to improve code placement
1899 freorder-blocks-and-partition
1900 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1901 Reorder basic blocks and partition into hot and cold sections
1904 Common Report Var(flag_reorder_functions) Optimization
1905 Reorder functions to improve code placement
1907 frerun-cse-after-loop
1908 Common Report Var(flag_rerun_cse_after_loop) Optimization
1909 Add a common subexpression elimination pass after loop optimizations
1913 Does nothing. Preserved for backward compatibility.
1916 Common Report Var(flag_rounding_math) Optimization SetByCombined
1917 Disable optimizations that assume default FP rounding behavior
1920 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1921 Enable scheduling across basic blocks
1924 Common Report Var(flag_sched_pressure) Init(0) Optimization
1925 Enable register pressure sensitive insn scheduling
1928 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1929 Allow speculative motion of non-loads
1932 Common Report Var(flag_schedule_speculative_load) Optimization
1933 Allow speculative motion of some loads
1935 fsched-spec-load-dangerous
1936 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1937 Allow speculative motion of more loads
1940 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1941 -fsched-verbose=<number> Set the verbosity level of the scheduler
1943 fsched2-use-superblocks
1944 Common Report Var(flag_sched2_use_superblocks) Optimization
1945 If scheduling post reload, do superblock scheduling
1949 Does nothing. Preserved for backward compatibility.
1952 Common Report Var(flag_schedule_insns) Optimization
1953 Reschedule instructions before register allocation
1956 Common Report Var(flag_schedule_insns_after_reload) Optimization
1957 Reschedule instructions after register allocation
1959 ; This flag should be on when a target implements non-trivial
1960 ; scheduling hooks, maybe saving some information for its own sake.
1961 ; On IA64, for example, this is used for correct bundling.
1962 fselective-scheduling
1963 Common Report Var(flag_selective_scheduling) Optimization
1964 Schedule instructions using selective scheduling algorithm
1966 fselective-scheduling2
1967 Common Report Var(flag_selective_scheduling2) Optimization
1968 Run selective scheduling after reload
1970 fsel-sched-pipelining
1971 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1972 Perform software pipelining of inner loops during selective scheduling
1974 fsel-sched-pipelining-outer-loops
1975 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1976 Perform software pipelining of outer loops during selective scheduling
1978 fsel-sched-reschedule-pipelined
1979 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1980 Reschedule pipelined regions without pipelining
1982 fsemantic-interposition
1983 Common Report Var(flag_semantic_interposition) Init(1)
1984 Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker
1986 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1987 ; of stalled insns into the ready list.
1988 fsched-stalled-insns
1989 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1990 Allow premature scheduling of queued insns
1992 fsched-stalled-insns=
1993 Common RejectNegative Joined UInteger Optimization
1994 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1996 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1997 ; be examined for a dependency on a stalled insn that is candidate for
1998 ; premature removal from the queue of stalled insns into the ready list (has
1999 ; an effect only if the flag 'sched_stalled_insns' is set).
2000 fsched-stalled-insns-dep
2001 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
2002 Set dependence distance checking in premature scheduling of queued insns
2004 fsched-stalled-insns-dep=
2005 Common RejectNegative Joined UInteger Optimization
2006 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
2008 fsched-group-heuristic
2009 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
2010 Enable the group heuristic in the scheduler
2012 fsched-critical-path-heuristic
2013 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
2014 Enable the critical path heuristic in the scheduler
2016 fsched-spec-insn-heuristic
2017 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
2018 Enable the speculative instruction heuristic in the scheduler
2020 fsched-rank-heuristic
2021 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
2022 Enable the rank heuristic in the scheduler
2024 fsched-last-insn-heuristic
2025 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
2026 Enable the last instruction heuristic in the scheduler
2028 fsched-dep-count-heuristic
2029 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
2030 Enable the dependent count heuristic in the scheduler
2033 Common Report Var(flag_section_anchors) Optimization
2034 Access data in the same section from shared anchor points
2038 Does nothing. Preserved for backward compatibility.
2042 Does nothing. Preserved for backward compatibility.
2045 Common Report Var(flag_ree) Init(0)
2046 Turn on Redundant Extensions Elimination pass.
2049 Common Report Var(flag_show_column) Init(1)
2050 Show column numbers in diagnostics, when available. Default on
2053 Common Report Var(flag_shrink_wrap) Optimization
2054 Emit function prologues only before parts of the function that need it,
2055 rather than at the top of the function.
2058 Common Report Var(flag_signaling_nans) Optimization SetByCombined
2059 Disable optimizations observable by IEEE signaling NaNs
2062 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
2063 Disable floating point optimizations that ignore the IEEE signedness of zero
2065 fsingle-precision-constant
2066 Common Report Var(flag_single_precision_constant) Optimization
2067 Convert floating point constants to single precision constants
2069 fsplit-ivs-in-unroller
2070 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
2071 Split lifetimes of induction variables when loops are unrolled
2074 Common Report Var(flag_split_stack) Init(-1)
2075 Generate discontiguous stack frames
2078 Common Report Var(flag_split_wide_types) Optimization
2079 Split wide types into independent registers
2082 Common Report Var(flag_ssa_phiopt) Optimization
2083 Optimize conditional patterns using SSA PHI nodes
2086 Common Report Var(flag_stdarg_opt) Init(1) Optimization
2087 Optimize amount of stdarg registers saved to stack at start of function
2089 fvariable-expansion-in-unroller
2090 Common Report Var(flag_variable_expansion_in_unroller) Optimization
2091 Apply variable expansion when loops are unrolled
2094 Common Report RejectNegative Joined
2095 -fstack-check=[no|generic|specific] Insert stack checking code into the program
2098 Common Alias(fstack-check=, specific, no)
2099 Insert stack checking code into the program. Same as -fstack-check=specific
2102 Common Var(common_deferred_options) Defer
2104 fstack-limit-register=
2105 Common RejectNegative Joined Var(common_deferred_options) Defer
2106 -fstack-limit-register=<register> Trap if the stack goes past <register>
2108 fstack-limit-symbol=
2109 Common RejectNegative Joined Var(common_deferred_options) Defer
2110 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
2113 Common Report Var(flag_stack_protect, 1)
2114 Use propolice as a stack protection method
2116 fstack-protector-all
2117 Common Report RejectNegative Var(flag_stack_protect, 2)
2118 Use a stack protection method for every function
2120 fstack-protector-strong
2121 Common Report RejectNegative Var(flag_stack_protect, 3)
2122 Use a smart stack protection method for certain functions
2124 fstack-protector-explicit
2125 Common Report RejectNegative Var(flag_stack_protect, 4)
2126 Use stack protection method only for functions with the stack_protect attribute
2129 Common RejectNegative Var(flag_stack_usage)
2130 Output stack usage information on a per-function basis
2134 Does nothing. Preserved for backward compatibility.
2136 ; Nonzero if we should do (language-dependent) alias analysis.
2137 ; Typically, this analysis will assume that expressions of certain
2138 ; types do not alias expressions of certain other types. Only used
2139 ; if alias analysis (in general) is enabled.
2141 Common Report Var(flag_strict_aliasing) Optimization
2142 Assume strict aliasing rules apply
2145 Common Report Var(flag_strict_overflow) Optimization
2146 Treat signed overflow as undefined
2149 Common Report Var(flag_sync_libcalls) Init(1)
2150 Implement __atomic operations via libcalls to legacy __sync functions
2153 Common Report Var(flag_syntax_only)
2154 Check for syntax errors, then stop
2157 Common Report Var(flag_test_coverage)
2158 Create data files needed by \"gcov\"
2161 Common Report Var(flag_thread_jumps) Optimization
2162 Perform jump threading optimizations
2165 Common Report Var(time_report)
2166 Report the time taken by each compiler pass
2169 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2170 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
2173 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2176 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2179 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2182 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2185 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2188 Common Report Var(flag_toplevel_reorder) Init(2)
2189 Reorder top level functions, variables, and asms
2192 Common Report Var(flag_tracer) Optimization
2193 Perform superblock formation via tail duplication
2195 ; Zero means that floating-point math operations cannot generate a
2196 ; (user-visible) trap. This is the case, for example, in nonstop
2197 ; IEEE 754 arithmetic.
2199 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2200 Assume floating-point operations can trap
2203 Common Report Var(flag_trapv) Optimization
2204 Trap for signed overflow in addition, subtraction and multiplication
2207 Common Report Var(flag_tree_ccp) Optimization
2208 Enable SSA-CCP optimization on trees
2211 Common Report Var(flag_tree_bit_ccp) Optimization
2212 Enable SSA-BIT-CCP optimization on trees
2216 Does nothing. Preserved for backward compatibility.
2219 Common Report Var(flag_tree_ch) Optimization
2220 Enable loop header copying on trees
2222 ftree-coalesce-inlined-vars
2223 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2224 Enable coalescing of copy-related user variables that are inlined
2227 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2228 Enable coalescing of all copy-related user variables
2231 Common Report Var(flag_tree_copyrename) Optimization
2232 Replace SSA temporaries with better names in copies
2235 Common Report Var(flag_tree_copy_prop) Optimization
2236 Enable copy propagation on trees
2238 ftree-store-copy-prop
2240 Does nothing. Preserved for backward compatibility.
2243 Common Report Var(flag_tree_cselim) Init(2) Optimization
2244 Transform condition stores into unconditional ones
2246 ftree-switch-conversion
2247 Common Report Var(flag_tree_switch_conversion) Optimization
2248 Perform conversions of switch initializations.
2251 Common Report Var(flag_tree_dce) Optimization
2252 Enable SSA dead code elimination optimization on trees
2254 ftree-dominator-opts
2255 Common Report Var(flag_tree_dom) Optimization
2256 Enable dominator optimizations
2259 Common Report Var(flag_tree_tail_merge) Optimization
2260 Enable tail merging on trees
2263 Common Report Var(flag_tree_dse) Optimization
2264 Enable dead store elimination
2267 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2268 Enable forward propagation on trees
2271 Common Report Var(flag_tree_fre) Optimization
2272 Enable Full Redundancy Elimination (FRE) on trees
2275 Common Report Var(flag_optimize_strlen) Optimization
2276 Enable string length optimizations on trees
2278 fisolate-erroneous-paths-dereference
2279 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2280 Detect paths that trigger erroneous or undefined behavior due to
2281 dereferencing a null pointer. Isolate those paths from the main control
2282 flow and turn the statement with erroneous or undefined behavior into a trap.
2284 fisolate-erroneous-paths-attribute
2285 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2286 Detect paths that trigger erroneous or undefined behavior due a null value
2287 being used in a way forbidden by a returns_nonnull or nonnull
2288 attribute. Isolate those paths from the main control flow and turn the
2289 statement with erroneous or undefined behavior into a trap.
2291 ftree-loop-distribution
2292 Common Report Var(flag_tree_loop_distribution) Optimization
2293 Enable loop distribution on trees
2295 ftree-loop-distribute-patterns
2296 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2297 Enable loop distribution for patterns transformed into a library call
2300 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2301 Enable loop invariant motion on trees
2304 Common Alias(floop-interchange)
2305 Enable loop interchange transforms. Same as -floop-interchange
2308 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2309 Create canonical induction variables in loops
2312 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2313 Enable loop optimizations on tree level
2315 ftree-parallelize-loops=
2316 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1) Optimization
2317 Enable automatic parallelization of loops
2320 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2321 Enable hoisting loads from conditional pointers.
2324 Common Report Var(flag_tree_pre) Optimization
2325 Enable SSA-PRE optimization on trees
2328 Common Report Var(flag_tree_partial_pre) Optimization
2329 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2332 Common Report Var(flag_tree_pta) Optimization
2333 Perform function-local points-to analysis on trees.
2336 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2337 Enable reassociation on tree level
2341 Does nothing. Preserved for backward compatibility.
2344 Common Report Var(flag_tree_sink) Optimization
2345 Enable SSA code sinking on trees
2348 Common Report Var(flag_tree_slsr) Optimization
2349 Perform straight-line strength reduction
2352 Common Report Var(flag_tree_sra) Optimization
2353 Perform scalar replacement of aggregates
2356 Common Report Var(flag_tree_ter) Optimization
2357 Replace temporary expressions in the SSA->normal pass
2360 Common Report Var(flag_tree_live_range_split) Optimization
2361 Perform live range splitting during the SSA->normal pass
2364 Common Report Var(flag_tree_vrp) Init(0) Optimization
2365 Perform Value Range Propagation on trees
2368 Common Report Var(flag_unit_at_a_time) Init(1)
2369 Compile whole compilation unit at a time
2372 Common Report Var(flag_unroll_loops) Optimization
2373 Perform loop unrolling when iteration count is known
2376 Common Report Var(flag_unroll_all_loops) Optimization
2377 Perform loop unrolling for all loops
2379 ; Nonzero means that loop optimizer may assume that the induction variables
2380 ; that control loops do not overflow and that the loops with nontrivial
2381 ; exit condition are not infinite
2382 funsafe-loop-optimizations
2383 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2384 Allow loop optimizations to assume that the loops behave in normal way
2387 Common Report Var(flag_associative_math) SetByCombined Optimization
2388 Allow optimization for floating-point arithmetic which may change the
2389 result of the operation due to rounding.
2392 Common Report Var(flag_reciprocal_math) SetByCombined Optimization
2393 Same as -fassociative-math for expressions which include division.
2395 ; Nonzero means that unsafe floating-point math optimizations are allowed
2396 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2397 ; are allowed to assume that their arguments and results are "normal"
2398 ; (e.g., nonnegative for SQRT).
2399 funsafe-math-optimizations
2400 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2401 Allow math optimizations that may violate IEEE or ISO standards
2404 Common Report Var(flag_unswitch_loops) Optimization
2405 Perform loop unswitching
2408 Common Report Var(flag_unwind_tables) Optimization
2409 Just generate unwind tables for exception handling
2412 Common Driver Negative(fuse-ld=gold)
2413 Use the bfd linker instead of the default linker
2416 Common Driver Negative(fuse-ld=bfd)
2417 Use the gold linker instead of the default linker
2420 Common Undocumented Var(flag_use_linker_plugin)
2422 ; Positive if we should track variables, negative if we should run
2423 ; the var-tracking pass only to discard debug annotations, zero if
2424 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2425 ; will be set according to optimize, debug_info_level and debug_hooks
2426 ; in process_options ().
2428 Common Report Var(flag_var_tracking) Init(2) Optimization
2429 Perform variable tracking
2431 ; Positive if we should track variables at assignments, negative if
2432 ; we should run the var-tracking pass only to discard debug
2433 ; annotations. When flag_var_tracking_assignments ==
2434 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2435 fvar-tracking-assignments
2436 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2437 Perform variable tracking by annotating assignments
2439 ; Nonzero if we should toggle flag_var_tracking_assignments after
2440 ; processing options and computing its default. */
2441 fvar-tracking-assignments-toggle
2442 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2443 Toggle -fvar-tracking-assignments
2445 ; Positive if we should track uninitialized variables, negative if
2446 ; we should run the var-tracking pass only to discard debug
2447 ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
2448 ; will be set according to flag_var_tracking.
2449 fvar-tracking-uninit
2450 Common Report Var(flag_var_tracking_uninit) Optimization
2451 Perform variable tracking and also tag variables that are uninitialized
2454 Common Report Var(flag_tree_vectorize) Optimization
2455 Enable vectorization on trees
2457 ftree-vectorizer-verbose=
2458 Common Joined RejectNegative Ignore
2459 Does nothing. Preserved for backward compatibility.
2461 ftree-loop-vectorize
2462 Common Report Var(flag_tree_loop_vectorize) Optimization
2463 Enable loop vectorization on trees
2466 Common Report Var(flag_tree_slp_vectorize) Optimization
2467 Enable basic block vectorization (SLP) on trees
2470 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT) Optimization
2471 Specifies the cost model for vectorization
2474 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED) Optimization
2475 Specifies the vectorization cost model for code marked with a simd directive
2478 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2481 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2484 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2487 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2490 Common RejectNegative Alias(fvect-cost-model=,dynamic)
2491 Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
2494 Common RejectNegative Alias(fvect-cost-model=,unlimited)
2495 Enables the unlimited vectorizer cost model. Preserved for backward compatibility.
2497 ftree-vect-loop-version
2499 Does nothing. Preserved for backward compatibility.
2502 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2503 Enable copy propagation of scalar-evolution information.
2505 ; -fverbose-asm causes extra commentary information to be produced in
2506 ; the generated assembly code (to make it more readable). This option
2507 ; is generally only of use to those who actually need to read the
2508 ; generated assembly code (perhaps while debugging the compiler itself).
2509 ; -fno-verbose-asm, the default, causes the extra information
2510 ; to not be added and is useful when comparing two assembler files.
2512 Common Report Var(flag_verbose_asm)
2513 Add extra commentary to assembler output
2516 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2517 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2520 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2523 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2526 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2529 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2532 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2535 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2536 Validate vtable pointers before using them.
2539 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2542 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2545 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2548 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2551 Common Var(flag_vtv_counts)
2552 Output vtable verification counters.
2555 Common Var(flag_vtv_debug)
2556 Output vtable verification pointer sets information.
2559 Common Report Var(flag_value_profile_transformations) Optimization
2560 Use expression value profiles in optimizations
2563 Common Report Var(flag_web) Init(2) Optimization
2564 Construct webs and split unrelated uses of single variable
2566 ftree-builtin-call-dce
2567 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2568 Enable conditional dead code elimination for builtin calls
2571 Common Report Var(flag_whole_program) Init(0)
2572 Perform whole program optimizations
2575 Common Report Var(flag_wrapv) Optimization
2576 Assume signed arithmetic overflow wraps around
2578 fzero-initialized-in-bss
2579 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2580 Put zero initialized data in the bss section
2583 Common JoinedOrMissing
2584 Generate debug information in default format
2587 Common JoinedOrMissing Negative(gdwarf)
2588 Generate debug information in COFF format
2591 Common JoinedOrMissing Negative(gdwarf-)
2592 Generate debug information in default version of DWARF format
2595 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2596 Generate debug information in DWARF v2 (or later) format
2599 Common JoinedOrMissing
2600 Generate debug information in default extended format
2603 Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2604 Don't generate DWARF pubnames and pubtypes sections.
2607 Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2608 Generate DWARF pubnames and pubtypes sections.
2611 Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2612 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2614 gno-record-gcc-switches
2615 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2616 Don't record gcc command line switches in DWARF DW_AT_producer.
2618 grecord-gcc-switches
2619 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2620 Record gcc command line switches in DWARF DW_AT_producer.
2623 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2624 Don't generate debug information in separate .dwo files
2627 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2628 Generate debug information in separate .dwo files
2631 Common JoinedOrMissing Negative(gstabs+)
2632 Generate debug information in STABS format
2635 Common JoinedOrMissing Negative(gvms)
2636 Generate debug information in extended STABS format
2639 Common RejectNegative Var(dwarf_strict,0) Init(0)
2640 Emit DWARF additions beyond selected version
2643 Common Report RejectNegative Var(dwarf_strict,1)
2644 Don't emit DWARF additions beyond selected version
2647 Common Report Var(flag_gtoggle)
2648 Toggle debug information generation
2651 Common JoinedOrMissing Negative(gxcoff)
2652 Generate debug information in VMS format
2655 Common JoinedOrMissing Negative(gxcoff+)
2656 Generate debug information in XCOFF format
2659 Common JoinedOrMissing Negative(gcoff)
2660 Generate debug information in extended XCOFF format
2663 Name(compressed_debug_sections) Type(int)
2665 ; Since -gz= is completely handled in specs, the values aren't used and we
2666 ; assign arbitrary constants.
2668 Enum(compressed_debug_sections) String(none) Value(0)
2671 Enum(compressed_debug_sections) String(zlib) Value(1)
2674 Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
2678 Generate compressed debug sections
2681 Common Driver Joined Enum(compressed_debug_sections)
2682 -gz=<format> Generate compressed debug sections in format <format>
2685 Driver Joined Separate
2688 Common Joined Var(plugindir_string) Init(0)
2689 -iplugindir=<dir> Set <dir> to be the default plugin directory
2692 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2693 -imultiarch <dir> Set <dir> to be the multiarch include subdirectory
2696 Driver Joined Separate
2701 no-canonical-prefixes
2714 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2715 -o <file> Place output into <file>
2718 Common Var(profile_flag)
2719 Enable function profiling
2722 Driver Var(pass_exit_codes)
2725 Common Alias(Wpedantic)
2728 Common Var(flag_pedantic_errors)
2729 Like -pedantic but issue them as errors
2735 Driver Var(use_pipes)
2738 Driver JoinedOrMissing Var(print_file_name)
2740 print-libgcc-file-name
2743 print-multi-directory
2744 Driver Var(print_multi_directory)
2747 Driver Var(print_multi_lib)
2749 print-multi-os-directory
2750 Driver Var(print_multi_os_directory)
2753 Driver Var(print_multiarch)
2756 Driver JoinedOrMissing Var(print_prog_name)
2759 Driver Var(print_search_dirs)
2762 Driver Var(print_sysroot)
2764 print-sysroot-headers-suffix
2765 Driver Var(print_sysroot_headers_suffix)
2768 Common Var(quiet_flag) RejectDriver
2769 Do not display functions compiled or elapsed time
2787 Driver Var(report_times)
2790 Driver JoinedOrMissing
2793 Driver Joined Separate
2797 ; C option, but driver must not handle as "-u ndef".
2800 Common Driver Var(verbose_flag)
2801 Enable verbose output
2804 Common Var(version_flag) RejectDriver
2805 Display the compiler's version
2808 Common Var(inhibit_warnings)
2812 Driver Separate Var(wrapper_string)
2815 Driver Joined Separate
2818 Driver RejectNegative Negative(pie)
2819 Create a shared library
2825 Driver Separate Alias(specs=)
2838 ; Documented for Fortran, but always accepted by driver.
2845 ; Documented for Go, but always accepted by driver.
2863 Driver RejectNegative Negative(shared)
2864 Create a position independent executable
2867 Driver Joined Separate
2870 Common Report Var(flag_ipa_ra) Optimization
2871 Use caller save register across calls if possible
2873 ; This comment is to ensure we retain the blank line above.