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 current default).
811 ; 3: The version of the ABI that fixes the missing underscore
812 ; in template non-type arguments of pointer type.
814 ; 4: The version of the ABI that introduces unambiguous mangling of
815 ; vector types. First selectable in G++ 4.5.
817 ; 5: The version of the ABI that ignores attribute const/noreturn
818 ; in function pointer mangling, and corrects mangling of decltype and
819 ; function parameters used in other parameters and the return type.
820 ; First selectable in G++ 4.6.
822 ; 6: The version of the ABI that doesn't promote scoped enums to int and
823 ; changes the mangling of template argument packs, const/static_cast,
824 ; prefix ++ and --, and a class scope function used as a template
826 ; First selectable in G++ 4.7.
828 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
829 ; corrects the mangling of lambdas in default argument scope.
830 ; First selectable in G++ 4.8.
832 ; 8: The version of the ABI that corrects the substitution behavior of
833 ; function types with function-cv-qualifiers.
834 ; First selectable in G++ 4.9.
836 ; Additional positive integers will be assigned as new versions of
837 ; the ABI become the default version of the ABI.
839 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(0)
840 The version of the C++ ABI in use
842 faggressive-loop-optimizations
843 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
844 Aggressively optimize loops using language constraints
847 Common Report Var(align_functions,0) Optimization UInteger
848 Align the start of functions
851 Common RejectNegative Joined UInteger Var(align_functions)
854 Common Report Var(align_jumps,0) Optimization UInteger
855 Align labels which are only reached by jumping
858 Common RejectNegative Joined UInteger Var(align_jumps)
861 Common Report Var(align_labels,0) Optimization UInteger
865 Common RejectNegative Joined UInteger Var(align_labels)
868 Common Report Var(align_loops,0) Optimization UInteger
869 Align the start of loops
872 Common RejectNegative Joined UInteger Var(align_loops)
876 Does nothing. Preserved for backward compatibility.
880 Does nothing. Preserved for backward compatibility.
882 fargument-noalias-global
884 Does nothing. Preserved for backward compatibility.
886 fargument-noalias-anything
888 Does nothing. Preserved for backward compatibility.
891 Common Driver Report Joined
892 Select what to sanitize
895 Common Joined RejectNegative Var(common_deferred_options) Defer
896 -fasan-shadow-offset=<number> Use custom shadow memory offset.
900 After diagnosing undefined behavior attempt to continue execution
904 This switch is deprecated; use -fsanitize-recover= instead
906 fsanitize-undefined-trap-on-error
907 Common Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
908 Use trap instead of a library function for undefined behavior sanitization
910 fasynchronous-unwind-tables
911 Common Report Var(flag_asynchronous_unwind_tables) Optimization
912 Generate unwind tables that are exact at each instruction boundary
915 Common Report Var(flag_auto_inc_dec) Init(1) Optimization
916 Generate auto-inc/dec instructions
919 Common Report Var(flag_auto_profile)
920 Use sample profile information for call graph node weights. The default
921 profile file is fbdata.afdo in 'pwd'.
924 Common Joined RejectNegative Var(auto_profile_file)
925 Use sample profile information for call graph node weights. The profile
926 file is specified in the argument.
928 ; -fcheck-bounds causes gcc to generate array bounds checks.
929 ; For C, C++ and ObjC: defaults off.
930 ; For Java: defaults to on.
931 ; For Fortran: defaults to off.
933 Common Report Var(flag_bounds_check)
934 Generate code to check bounds before indexing arrays
937 Common Report Var(flag_branch_on_count_reg) Optimization
938 Replace add, compare, branch with branch on count register
940 fbranch-probabilities
941 Common Report Var(flag_branch_probabilities) Optimization
942 Use profiling information for branch probabilities
944 fbranch-target-load-optimize
945 Common Report Var(flag_branch_target_load_optimize) Optimization
946 Perform branch target load optimization before prologue / epilogue threading
948 fbranch-target-load-optimize2
949 Common Report Var(flag_branch_target_load_optimize2) Optimization
950 Perform branch target load optimization after prologue / epilogue threading
953 Common Report Var(flag_btr_bb_exclusive) Optimization
954 Restrict target load migration not to re-use registers in any basic block
957 Common Joined RejectNegative Var(common_deferred_options) Defer
958 -fcall-saved-<register> Mark <register> as being preserved across functions
961 Common Joined RejectNegative Var(common_deferred_options) Defer
962 -fcall-used-<register> Mark <register> as being corrupted by function calls
964 ; Nonzero for -fcaller-saves: allocate values in regs that need to
965 ; be saved across function calls, if that produces overall better code.
966 ; Optional now, so people can test it.
968 Common Report Var(flag_caller_saves) Optimization
969 Save registers around function calls
972 Common Report Var(flag_check_data_deps)
973 Compare the results of several data dependence analyzers.
976 Common Var(flag_check_new)
977 Check the return value of new in C++
979 fcombine-stack-adjustments
980 Common Report Var(flag_combine_stack_adjustments) Optimization
981 Looks for opportunities to reduce stack adjustments and stack references.
984 Common Report Var(flag_no_common,0)
985 Do not put uninitialized globals in the common section
989 ; Converted by the driver to -fcompare-debug= options.
992 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
993 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
995 fcompare-debug-second
996 Common Driver RejectNegative Var(flag_compare_debug)
997 Run only the second compilation of -fcompare-debug
1000 Common Report Var(flag_compare_elim_after_reload) Optimization
1001 Perform comparison elimination after register allocation has finished
1004 Common Var(flag_conserve_stack) Optimization
1005 Do not perform optimizations increasing noticeably stack usage
1008 Common Report Var(flag_cprop_registers) Optimization
1009 Perform a register copy-propagation optimization pass
1012 Common Report Var(flag_crossjumping) Optimization
1013 Perform cross-jumping optimization
1016 Common Report Var(flag_cse_follow_jumps) Optimization
1017 When running CSE, follow jumps to their targets
1021 Does nothing. Preserved for backward compatibility.
1024 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
1025 Omit range reduction step when performing complex division
1028 Common Report Var(flag_cx_fortran_rules) Optimization
1029 Complex multiplication and division follow Fortran rules
1032 Common Report Var(flag_data_sections)
1033 Place data items into their own section
1036 Common Report Var(common_deferred_options) Defer
1037 List all available debugging counters with their limits and counts.
1040 Common RejectNegative Joined Var(common_deferred_options) Defer
1041 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
1044 Common Joined RejectNegative Var(common_deferred_options) Defer
1045 Map one directory name to another in debug information
1047 fdebug-types-section
1048 Common Report Var(flag_debug_types_section) Init(0)
1049 Output .debug_types section when using DWARF v4 debuginfo.
1051 ; Nonzero for -fdefer-pop: don't pop args after each function call
1052 ; instead save them up to pop many calls' args with one insns.
1054 Common Report Var(flag_defer_pop) Optimization
1055 Defer popping functions args from stack until later
1058 Common Report Var(flag_delayed_branch) Optimization
1059 Attempt to fill delay slots of branch instructions
1061 fdelete-dead-exceptions
1062 Common Report Var(flag_delete_dead_exceptions) Init(0) Optimization
1063 Delete dead instructions that may throw exceptions
1065 fdelete-null-pointer-checks
1066 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
1067 Delete useless null pointer checks
1069 fdevirtualize-at-ltrans
1070 Common Report Var(flag_ltrans_devirtualize)
1071 Stream extra data to support more aggressive devirtualization in LTO local transformation mode
1073 fdevirtualize-speculatively
1074 Common Report Var(flag_devirtualize_speculatively) Optimization
1075 Perform speculative devirtualization
1078 Common Report Var(flag_devirtualize) Optimization
1079 Try to convert virtual calls to direct ones.
1081 fdiagnostics-show-location=
1082 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1083 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
1085 ; Required for these enum values.
1090 Name(diagnostic_prefixing_rule) Type(int)
1093 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1096 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1098 fdiagnostics-show-caret
1099 Common Var(flag_diagnostics_show_caret) Init(1)
1100 Show the source line with a caret indicating the column
1103 Common Alias(fdiagnostics-color=,always,never)
1107 Driver Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1108 -fdiagnostics-color=[never|always|auto] Colorize diagnostics
1110 ; Required for these enum values.
1115 Name(diagnostic_color_rule) Type(int)
1118 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1121 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1124 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1126 fdiagnostics-show-option
1127 Common Var(flag_diagnostics_show_option) Init(1)
1128 Amend appropriate diagnostic messages with the command line option that controls them
1131 Common Joined RejectNegative Var(common_deferred_options) Defer
1132 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1135 Common Joined RejectNegative Var(common_deferred_options) Defer
1136 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1139 Common Joined RejectNegative Var(common_deferred_options) Defer
1140 -fdump-<type> Dump various compiler internals to a file
1143 Driver RejectNegative
1146 Common RejectNegative Joined Var(flag_dump_final_insns)
1147 -fdump-final-insns=filename Dump to filename the insns at the end of translation
1150 Common RejectNegative Joined Var(flag_dump_go_spec)
1151 -fdump-go-spec=filename Write all declarations to file as Go code
1154 Common Report Var(flag_dump_noaddr)
1155 Suppress output of addresses in debugging dumps
1158 Common Driver Var(flag_report_bug)
1159 Collect and dump debug information into temporary file if ICE in C/C++
1163 Common Var(flag_dump_passes) Init(0)
1164 Dump optimization passes
1167 Common Report Var(flag_dump_unnumbered)
1168 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1170 fdump-unnumbered-links
1171 Common Report Var(flag_dump_unnumbered_links)
1172 Suppress output of previous and next insn numbers in debugging dumps
1175 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1176 Enable CFI tables via GAS assembler directives.
1179 Common Report Var(flag_early_inlining) Init(1) Optimization
1180 Perform early inlining
1182 feliminate-dwarf2-dups
1183 Common Report Var(flag_eliminate_dwarf2_dups)
1184 Perform DWARF2 duplicate elimination
1187 Common Report Var(flag_ipa_sra) Init(0) Optimization
1188 Perform interprocedural reduction of aggregates
1190 feliminate-unused-debug-symbols
1191 Common Report Var(flag_debug_only_used_symbols)
1192 Perform unused type elimination in debug info
1194 feliminate-unused-debug-types
1195 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1196 Perform unused type elimination in debug info
1198 femit-class-debug-always
1199 Common Report Var(flag_emit_class_debug_always) Init(0)
1200 Do not suppress C++ class debug information.
1203 Common Report Var(flag_exceptions) Optimization
1204 Enable exception handling
1206 fexpensive-optimizations
1207 Common Report Var(flag_expensive_optimizations) Optimization
1208 Perform a number of minor, expensive optimizations
1211 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1212 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1215 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1218 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1221 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1227 Common Var(flag_fat_lto_objects)
1228 Output lto objects containing both the intermediate language and binary output.
1231 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1232 Assume no NaNs or infinities are generated
1235 Common Joined RejectNegative Var(common_deferred_options) Defer
1236 -ffixed-<register> Mark <register> as being unavailable to the compiler
1239 Common Report Var(flag_float_store) Optimization
1240 Don't allocate floats and doubles in extended-precision registers
1244 Does nothing. Preserved for backward compatibility.
1247 Common Report Var(flag_forward_propagate) Optimization
1248 Perform a forward propagation pass on RTL
1251 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST) Optimization
1252 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1255 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1258 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1260 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1262 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1265 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1267 ; Nonzero means don't put addresses of constant functions in registers.
1268 ; Used for compiling the Unix kernel, where strange substitutions are
1269 ; done on the assembly output.
1271 Common Report Var(flag_no_function_cse,0) Optimization
1272 Allow function addresses to be held in registers
1275 Common Report Var(flag_function_sections)
1276 Place each function into its own section
1279 Common Report Var(flag_gcse) Optimization
1280 Perform global common subexpression elimination
1283 Common Report Var(flag_gcse_lm) Init(1) Optimization
1284 Perform enhanced load motion during global common subexpression elimination
1287 Common Report Var(flag_gcse_sm) Init(0) Optimization
1288 Perform store motion after global common subexpression elimination
1291 Common Report Var(flag_gcse_las) Init(0) Optimization
1292 Perform redundant load after store elimination in global common subexpression
1296 Common Report Var(flag_gcse_after_reload) Optimization
1297 Perform global common subexpression elimination after register allocation
1300 ; This option is not documented yet as its semantics will change.
1302 Common Report Var(flag_graphite) Optimization
1303 Enable in and out of Graphite representation
1306 Common Report Var(flag_graphite_identity) Optimization
1307 Enable Graphite Identity transformation
1309 fhoist-adjacent-loads
1310 Common Report Var(flag_hoist_adjacent_loads) Optimization
1311 Enable hoisting adjacent loads to encourage generating conditional move
1314 floop-parallelize-all
1315 Common Report Var(flag_loop_parallelize_all) Optimization
1316 Mark all loops as parallel
1319 Common Report Var(flag_loop_strip_mine) Optimization
1320 Enable Loop Strip Mining transformation
1323 Common Report Var(flag_loop_interchange) Optimization
1324 Enable Loop Interchange transformation
1327 Common Report Var(flag_loop_block) Optimization
1328 Enable Loop Blocking transformation
1330 floop-unroll-and-jam
1331 Common Report Var(flag_loop_unroll_jam) Optimization
1332 Enable Loop Unroll Jam transformation
1335 Common Report Var(flag_tm)
1336 Enable support for GNU transactional memory
1339 Common Report Var(flag_gnu_unique) Init(1)
1340 Use STB_GNU_UNIQUE if supported by the assembler
1344 Does nothing. Preserved for backward compatibility.
1347 Common Report Var(flag_loop_optimize_isl) Optimization
1348 Enable the ISL based loop nest optimizer
1350 fstrict-volatile-bitfields
1351 Common Report Var(flag_strict_volatile_bitfields) Init(-1) Optimization
1352 Force bitfield accesses to match their type width
1354 fguess-branch-probability
1355 Common Report Var(flag_guess_branch_prob) Optimization
1356 Enable guessing of branch probabilities
1358 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1359 ; Generate position-independent code for executables if possible
1360 ; On SVR4 targets, it also controls whether or not to emit a
1361 ; string identifying the compiler.
1363 Common Report Var(flag_no_ident,0)
1364 Process #ident directives
1367 Common Report Var(flag_if_conversion) Optimization
1368 Perform conversion of conditional jumps to branchless equivalents
1371 Common Report Var(flag_if_conversion2) Optimization
1372 Perform conversion of conditional jumps to conditional execution
1375 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL) Optimization
1376 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1379 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1382 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1385 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1388 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1390 ftree-loop-if-convert
1391 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1392 Convert conditional jumps in innermost loops to branchless equivalents
1394 ftree-loop-if-convert-stores
1395 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1396 Also if-convert conditional jumps containing memory writes
1398 ; -finhibit-size-directive inhibits output of .size for ELF.
1399 ; This is used only for compiling crtstuff.c,
1400 ; and it may be extended to other effects
1401 ; needed for crtstuff.c on other systems.
1402 finhibit-size-directive
1403 Common Report Var(flag_inhibit_size_directive)
1404 Do not generate .size directives
1407 Common Report Var(flag_indirect_inlining) Optimization
1408 Perform indirect inlining
1410 ; General flag to enable inlining. Specifying -fno-inline will disable
1411 ; all inlining apart from always-inline functions.
1413 Common Report Var(flag_no_inline,0) Init(0) Optimization
1414 Enable inlining of function declared \"inline\", disabling disables all inlining
1416 finline-small-functions
1417 Common Report Var(flag_inline_small_functions) Optimization
1418 Integrate functions into their callers when code size is known not to grow
1421 Common Report Var(flag_inline_functions) Optimization
1422 Integrate functions not declared \"inline\" into their callers when profitable
1424 finline-functions-called-once
1425 Common Report Var(flag_inline_functions_called_once) Optimization
1426 Integrate functions only required by their single caller
1429 Common RejectNegative Joined Alias(finline-limit=)
1432 Common RejectNegative Joined UInteger
1433 -finline-limit=<number> Limit the size of inlined functions to <number>
1436 Common Report Var(flag_inline_atomics) Init(1) Optimization
1437 Inline __atomic operations when a lock free instruction sequence is available.
1439 finstrument-functions
1440 Common Report Var(flag_instrument_function_entry_exit)
1441 Instrument function entry and exit with profiling calls
1443 finstrument-functions-exclude-function-list=
1444 Common RejectNegative Joined
1445 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1447 finstrument-functions-exclude-file-list=
1448 Common RejectNegative Joined
1449 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1452 Common Report Var(flag_ipa_cp) Optimization
1453 Perform interprocedural constant propagation
1456 Common Report Var(flag_ipa_cp_clone) Optimization
1457 Perform cloning to make Interprocedural constant propagation stronger
1460 Common Report Var(flag_ipa_profile) Init(0) Optimization
1461 Perform interprocedural profile propagation
1464 Common Report Var(flag_ipa_pta) Init(0) Optimization
1465 Perform interprocedural points-to analysis
1468 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1469 Discover pure and const functions
1472 Common Report Var(flag_ipa_icf) Optimization
1473 Perform Identical Code Folding for functions and read-only variables
1476 Common Report Var(flag_ipa_icf_functions) Optimization
1477 Perform Identical Code Folding for functions
1480 Common Report Var(flag_ipa_icf_variables)
1481 Perform Identical Code Folding for variables
1484 Common Report Var(flag_ipa_reference) Init(0) Optimization
1485 Discover readonly and non addressable static variables
1489 Does nothing. Preserved for backward compatibility.
1493 Does nothing. Preserved for backward compatibility.
1496 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB) Optimization
1497 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1500 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1503 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1506 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1509 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT) Optimization
1510 -fira-region=[one|all|mixed] Set regions for IRA
1513 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1516 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1519 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1522 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1525 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1526 Use IRA based register pressure calculation
1527 in RTL hoist optimizations.
1530 Common Report Var(flag_ira_loop_pressure) Optimization
1531 Use IRA based register pressure calculation
1532 in RTL loop optimizations.
1534 fira-share-save-slots
1535 Common Report Var(flag_ira_share_save_slots) Init(1) Optimization
1536 Share slots for saving different hard registers.
1538 fira-share-spill-slots
1539 Common Report Var(flag_ira_share_spill_slots) Init(1) Optimization
1540 Share stack slots for spilled pseudo-registers.
1543 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1544 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1547 Common Report Var(flag_ivopts) Init(1) Optimization
1548 Optimize induction variables on trees
1551 Common Var(flag_jump_tables) Init(1) Optimization
1552 Use jump tables for sufficiently large switch statements
1554 fkeep-inline-functions
1555 Common Report Var(flag_keep_inline_functions)
1556 Generate code for functions even if they are fully inlined
1559 Common Report Var(flag_keep_static_consts) Init(1)
1560 Emit static const variables even if they are not used
1563 Common Report Var(flag_leading_underscore) Init(-1)
1564 Give external symbols a leading underscore
1568 Does nothing. Preserved for backward compatibility.
1571 Common Report Var(flag_lra_remat) Optimization
1572 Do CFG-sensitive rematerialization in LRA
1576 Enable link-time optimization.
1579 Common RejectNegative Joined Var(flag_lto)
1580 Link-time optimization with number of parallel jobs or jobserver.
1583 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1586 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1589 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1592 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1595 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1598 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1601 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1602 Specify the algorithm to partition symbols and vars at linktime
1604 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1605 flto-compression-level=
1606 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1607 -flto-compression-level=<number> Use zlib compression level <number> for IL
1609 flto-odr-type-merging
1610 Common Report Var(flag_lto_odr_type_mering) Init(1)
1611 Merge C++ types using One Definition Rule
1614 Common Report Var(flag_lto_report) Init(0)
1615 Report various link-time optimization statistics
1618 Common Report Var(flag_lto_report_wpa) Init(0)
1619 Report various link-time optimization statistics for WPA only
1622 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1623 Set errno after built-in math functions
1626 Common Joined RejectNegative UInteger Var(flag_max_errors)
1627 -fmax-errors=<number> Maximum number of errors to report
1630 Common Report Var(mem_report)
1631 Report on permanent memory allocation
1634 Common Report Var(mem_report_wpa)
1635 Report on permanent memory allocation in WPA only
1637 ; This will attempt to merge constant section constants, if 1 only
1638 ; string constants and constants from constant pool, if 2 also constant
1640 fmerge-all-constants
1641 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1642 Attempt to merge identical constants and constant variables
1645 Common Report Var(flag_merge_constants,1) Optimization
1646 Attempt to merge identical constants across compilation units
1648 fmerge-debug-strings
1649 Common Report Var(flag_merge_debug_strings) Init(1)
1650 Attempt to merge identical debug strings across compilation units
1653 Common RejectNegative Joined UInteger
1654 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1657 Common Report Var(flag_modulo_sched) Optimization
1658 Perform SMS based modulo scheduling before the first scheduling pass
1660 fmodulo-sched-allow-regmoves
1661 Common Report Var(flag_modulo_sched_allow_regmoves) Optimization
1662 Perform SMS based modulo scheduling with register moves allowed
1664 fmove-loop-invariants
1665 Common Report Var(flag_move_loop_invariants) Optimization
1666 Move loop invariant computations out of loops
1669 Common Var(flag_dce) Init(1) Optimization
1670 Use the RTL dead code elimination pass
1673 Common Var(flag_dse) Init(1) Optimization
1674 Use the RTL dead store elimination pass
1676 freschedule-modulo-scheduled-loops
1677 Common Report Var(flag_resched_modulo_sched) Optimization
1678 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1680 fnon-call-exceptions
1681 Common Report Var(flag_non_call_exceptions) Optimization
1682 Support synchronous non-call exceptions
1685 Common Driver Joined MissingArgError(options or targets missing after %qs)
1686 -foffload=<targets>=<options> Specify offloading targets and options for them
1689 Common Joined RejectNegative Enum(offload_abi) Var(flag_offload_abi) Init(OFFLOAD_ABI_UNSET)
1690 -foffload-abi=[lp64|ilp32] Set the ABI to use in an offload compiler
1693 Name(offload_abi) Type(enum offload_abi) UnknownError(unknown offload ABI %qs)
1696 Enum(offload_abi) String(ilp32) Value(OFFLOAD_ABI_ILP32)
1699 Enum(offload_abi) String(lp64) Value(OFFLOAD_ABI_LP64)
1702 Common Report Var(flag_omit_frame_pointer) Optimization
1703 When possible do not generate stack frames
1706 Common Report Var(flag_opt_info) Optimization
1707 Enable all optimization info dumps on stderr
1710 Common Joined RejectNegative Var(common_deferred_options) Defer
1711 -fopt-info[-<type>=filename] Dump compiler optimization details
1713 foptimize-register-move
1715 Does nothing. Preserved for backward compatibility.
1717 foptimize-sibling-calls
1718 Common Report Var(flag_optimize_sibling_calls) Optimization
1719 Optimize sibling and tail recursive calls
1722 Common Report Var(flag_partial_inlining) Optimization
1723 Perform partial inlining
1726 Common Report Var(pre_ipa_mem_report)
1727 Report on memory allocation before interprocedural optimization
1729 fpost-ipa-mem-report
1730 Common Report Var(post_ipa_mem_report)
1731 Report on memory allocation before interprocedural optimization
1734 Common Report Var(flag_pack_struct) Optimization
1735 Pack structure members together without holes
1738 Common RejectNegative Joined UInteger Optimization
1739 -fpack-struct=<number> Set initial maximum structure member alignment
1742 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1743 Return small aggregates in memory, not registers
1746 Common Report Var(flag_peel_loops) Optimization
1747 Perform loop peeling
1750 Common Report Var(flag_no_peephole,0) Optimization
1751 Enable machine specific peephole optimizations
1754 Common Report Var(flag_peephole2) Optimization
1755 Enable an RTL peephole pass before sched2
1758 Common Report Var(flag_pic,2) Negative(fPIE)
1759 Generate position-independent code if possible (large mode)
1762 Common Report Var(flag_pie,2) Negative(fpic)
1763 Generate position-independent code for executables if possible (large mode)
1766 Common Report Var(flag_pic,1) Negative(fpie)
1767 Generate position-independent code if possible (small mode)
1770 Common Report Var(flag_pie,1) Negative(fPIC)
1771 Generate position-independent code for executables if possible (small mode)
1774 Common Joined RejectNegative Var(common_deferred_options) Defer
1775 Specify a plugin to load
1778 Common Joined RejectNegative Var(common_deferred_options) Defer
1779 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1781 fpredictive-commoning
1782 Common Report Var(flag_predictive_commoning) Optimization
1783 Run predictive commoning optimization.
1785 fprefetch-loop-arrays
1786 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1787 Generate prefetch instructions, if available, for arrays in loops
1790 Common Report Var(profile_flag)
1791 Enable basic program profiling code
1794 Common Report Var(profile_arc_flag)
1795 Insert arc-based program profiling code
1798 Common Joined RejectNegative Var(profile_data_prefix)
1799 Set the top-level directory for storing the profile data.
1800 The default is 'pwd'.
1803 Common Report Var(flag_profile_correction)
1804 Enable correction of flow inconsistent profile data input
1808 Enable common options for generating profile info for profile feedback directed optimizations
1811 Common Joined RejectNegative
1812 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1815 Common Var(flag_profile_use)
1816 Enable common options for performing profile feedback directed optimizations
1819 Common Joined RejectNegative
1820 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1823 Common Report Var(flag_profile_values)
1824 Insert code to profile values of expressions
1827 Common Report Var(profile_report)
1828 Report on consistency of profile
1830 fprofile-reorder-functions
1831 Common Report Var(flag_profile_reorder_functions)
1832 Enable function reordering that improves code placement
1835 Common Var(common_deferred_options) Defer
1838 Common Joined RejectNegative Var(common_deferred_options) Defer
1839 -frandom-seed=<number> Make compile reproducible using <number>
1841 ; This switch causes the command line that was used to create an
1842 ; object file to be recorded into the object file. The exact format
1843 ; of this recording is target and binary file format dependent.
1844 ; It is related to the -fverbose-asm switch, but that switch only
1845 ; records information in the assembler output file as comments, so
1846 ; they never reach the object file.
1847 frecord-gcc-switches
1848 Common Report Var(flag_record_gcc_switches)
1849 Record gcc command line switches in the object file.
1852 Common Report Var(flag_pcc_struct_return,0) Optimization
1853 Return small aggregates in registers
1857 Does nothing. Preserved for backward compatibility.
1860 Common Report Var(flag_lifetime_dse) Init(1) Optimization
1861 Tell DSE that the storage for a C++ object is dead when the constructor
1862 starts and when the destructor finishes.
1864 flive-range-shrinkage
1865 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
1866 Relief of register pressure through live range shrinkage
1869 Common Report Var(flag_rename_registers) Init(2) Optimization
1870 Perform a register renaming optimization pass
1873 Common Report Var(flag_schedule_fusion) Init(2) Optimization
1874 Perform a target dependent instruction fusion optimization pass
1877 Common Report Var(flag_reorder_blocks) Optimization
1878 Reorder basic blocks to improve code placement
1880 freorder-blocks-and-partition
1881 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1882 Reorder basic blocks and partition into hot and cold sections
1885 Common Report Var(flag_reorder_functions) Optimization
1886 Reorder functions to improve code placement
1888 frerun-cse-after-loop
1889 Common Report Var(flag_rerun_cse_after_loop) Optimization
1890 Add a common subexpression elimination pass after loop optimizations
1894 Does nothing. Preserved for backward compatibility.
1897 Common Report Var(flag_rounding_math) Optimization SetByCombined
1898 Disable optimizations that assume default FP rounding behavior
1901 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1902 Enable scheduling across basic blocks
1905 Common Report Var(flag_sched_pressure) Init(0) Optimization
1906 Enable register pressure sensitive insn scheduling
1909 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1910 Allow speculative motion of non-loads
1913 Common Report Var(flag_schedule_speculative_load) Optimization
1914 Allow speculative motion of some loads
1916 fsched-spec-load-dangerous
1917 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1918 Allow speculative motion of more loads
1921 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1922 -fsched-verbose=<number> Set the verbosity level of the scheduler
1924 fsched2-use-superblocks
1925 Common Report Var(flag_sched2_use_superblocks) Optimization
1926 If scheduling post reload, do superblock scheduling
1930 Does nothing. Preserved for backward compatibility.
1933 Common Report Var(flag_schedule_insns) Optimization
1934 Reschedule instructions before register allocation
1937 Common Report Var(flag_schedule_insns_after_reload) Optimization
1938 Reschedule instructions after register allocation
1940 ; This flag should be on when a target implements non-trivial
1941 ; scheduling hooks, maybe saving some information for its own sake.
1942 ; On IA64, for example, this is used for correct bundling.
1943 fselective-scheduling
1944 Common Report Var(flag_selective_scheduling) Optimization
1945 Schedule instructions using selective scheduling algorithm
1947 fselective-scheduling2
1948 Common Report Var(flag_selective_scheduling2) Optimization
1949 Run selective scheduling after reload
1951 fsel-sched-pipelining
1952 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1953 Perform software pipelining of inner loops during selective scheduling
1955 fsel-sched-pipelining-outer-loops
1956 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1957 Perform software pipelining of outer loops during selective scheduling
1959 fsel-sched-reschedule-pipelined
1960 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1961 Reschedule pipelined regions without pipelining
1963 fsemantic-interposition
1964 Common Report Var(flag_semantic_interposition) Init(1)
1965 Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker
1967 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1968 ; of stalled insns into the ready list.
1969 fsched-stalled-insns
1970 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1971 Allow premature scheduling of queued insns
1973 fsched-stalled-insns=
1974 Common RejectNegative Joined UInteger Optimization
1975 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1977 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1978 ; be examined for a dependency on a stalled insn that is candidate for
1979 ; premature removal from the queue of stalled insns into the ready list (has
1980 ; an effect only if the flag 'sched_stalled_insns' is set).
1981 fsched-stalled-insns-dep
1982 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1983 Set dependence distance checking in premature scheduling of queued insns
1985 fsched-stalled-insns-dep=
1986 Common RejectNegative Joined UInteger Optimization
1987 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1989 fsched-group-heuristic
1990 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1991 Enable the group heuristic in the scheduler
1993 fsched-critical-path-heuristic
1994 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1995 Enable the critical path heuristic in the scheduler
1997 fsched-spec-insn-heuristic
1998 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1999 Enable the speculative instruction heuristic in the scheduler
2001 fsched-rank-heuristic
2002 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
2003 Enable the rank heuristic in the scheduler
2005 fsched-last-insn-heuristic
2006 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
2007 Enable the last instruction heuristic in the scheduler
2009 fsched-dep-count-heuristic
2010 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
2011 Enable the dependent count heuristic in the scheduler
2014 Common Report Var(flag_section_anchors) Optimization
2015 Access data in the same section from shared anchor points
2019 Does nothing. Preserved for backward compatibility.
2023 Does nothing. Preserved for backward compatibility.
2026 Common Report Var(flag_ree) Init(0)
2027 Turn on Redundant Extensions Elimination pass.
2030 Common Report Var(flag_show_column) Init(1)
2031 Show column numbers in diagnostics, when available. Default on
2034 Common Report Var(flag_shrink_wrap) Optimization
2035 Emit function prologues only before parts of the function that need it,
2036 rather than at the top of the function.
2039 Common Report Var(flag_signaling_nans) Optimization SetByCombined
2040 Disable optimizations observable by IEEE signaling NaNs
2043 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
2044 Disable floating point optimizations that ignore the IEEE signedness of zero
2046 fsingle-precision-constant
2047 Common Report Var(flag_single_precision_constant) Optimization
2048 Convert floating point constants to single precision constants
2050 fsplit-ivs-in-unroller
2051 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
2052 Split lifetimes of induction variables when loops are unrolled
2055 Common Report Var(flag_split_stack) Init(-1)
2056 Generate discontiguous stack frames
2059 Common Report Var(flag_split_wide_types) Optimization
2060 Split wide types into independent registers
2063 Common Report Var(flag_ssa_phiopt) Optimization
2064 Optimize conditional patterns using SSA PHI nodes
2066 fvariable-expansion-in-unroller
2067 Common Report Var(flag_variable_expansion_in_unroller) Optimization
2068 Apply variable expansion when loops are unrolled
2071 Common Report RejectNegative Joined
2072 -fstack-check=[no|generic|specific] Insert stack checking code into the program
2075 Common Alias(fstack-check=, specific, no)
2076 Insert stack checking code into the program. Same as -fstack-check=specific
2079 Common Var(common_deferred_options) Defer
2081 fstack-limit-register=
2082 Common RejectNegative Joined Var(common_deferred_options) Defer
2083 -fstack-limit-register=<register> Trap if the stack goes past <register>
2085 fstack-limit-symbol=
2086 Common RejectNegative Joined Var(common_deferred_options) Defer
2087 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
2090 Common Report Var(flag_stack_protect, 1)
2091 Use propolice as a stack protection method
2093 fstack-protector-all
2094 Common Report RejectNegative Var(flag_stack_protect, 2)
2095 Use a stack protection method for every function
2097 fstack-protector-strong
2098 Common Report RejectNegative Var(flag_stack_protect, 3)
2099 Use a smart stack protection method for certain functions
2101 fstack-protector-explicit
2102 Common Report RejectNegative Var(flag_stack_protect, 4)
2103 Use stack protection method only for functions with the stack_protect attribute
2106 Common RejectNegative Var(flag_stack_usage)
2107 Output stack usage information on a per-function basis
2111 Does nothing. Preserved for backward compatibility.
2113 ; Nonzero if we should do (language-dependent) alias analysis.
2114 ; Typically, this analysis will assume that expressions of certain
2115 ; types do not alias expressions of certain other types. Only used
2116 ; if alias analysis (in general) is enabled.
2118 Common Report Var(flag_strict_aliasing) Optimization
2119 Assume strict aliasing rules apply
2122 Common Report Var(flag_strict_overflow) Optimization
2123 Treat signed overflow as undefined
2126 Common Report Var(flag_sync_libcalls) Init(1)
2127 Implement __atomic operations via libcalls to legacy __sync functions
2130 Common Report Var(flag_syntax_only)
2131 Check for syntax errors, then stop
2134 Common Report Var(flag_test_coverage)
2135 Create data files needed by \"gcov\"
2138 Common Report Var(flag_thread_jumps) Optimization
2139 Perform jump threading optimizations
2142 Common Report Var(time_report)
2143 Report the time taken by each compiler pass
2146 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2147 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
2150 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2153 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2156 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2159 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2162 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2165 Common Report Var(flag_toplevel_reorder) Init(2)
2166 Reorder top level functions, variables, and asms
2169 Common Report Var(flag_tracer) Optimization
2170 Perform superblock formation via tail duplication
2172 ; Zero means that floating-point math operations cannot generate a
2173 ; (user-visible) trap. This is the case, for example, in nonstop
2174 ; IEEE 754 arithmetic.
2176 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2177 Assume floating-point operations can trap
2180 Common Report Var(flag_trapv) Optimization
2181 Trap for signed overflow in addition, subtraction and multiplication
2184 Common Report Var(flag_tree_ccp) Optimization
2185 Enable SSA-CCP optimization on trees
2188 Common Report Var(flag_tree_bit_ccp) Optimization
2189 Enable SSA-BIT-CCP optimization on trees
2193 Does nothing. Preserved for backward compatibility.
2196 Common Report Var(flag_tree_ch) Optimization
2197 Enable loop header copying on trees
2199 ftree-coalesce-inlined-vars
2200 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2201 Enable coalescing of copy-related user variables that are inlined
2204 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2205 Enable coalescing of all copy-related user variables
2208 Common Report Var(flag_tree_copyrename) Optimization
2209 Replace SSA temporaries with better names in copies
2212 Common Report Var(flag_tree_copy_prop) Optimization
2213 Enable copy propagation on trees
2215 ftree-store-copy-prop
2217 Does nothing. Preserved for backward compatibility.
2220 Common Report Var(flag_tree_cselim) Init(2) Optimization
2221 Transform condition stores into unconditional ones
2223 ftree-switch-conversion
2224 Common Report Var(flag_tree_switch_conversion) Optimization
2225 Perform conversions of switch initializations.
2228 Common Report Var(flag_tree_dce) Optimization
2229 Enable SSA dead code elimination optimization on trees
2231 ftree-dominator-opts
2232 Common Report Var(flag_tree_dom) Optimization
2233 Enable dominator optimizations
2236 Common Report Var(flag_tree_tail_merge) Optimization
2237 Enable tail merging on trees
2240 Common Report Var(flag_tree_dse) Optimization
2241 Enable dead store elimination
2244 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2245 Enable forward propagation on trees
2248 Common Report Var(flag_tree_fre) Optimization
2249 Enable Full Redundancy Elimination (FRE) on trees
2252 Common Report Var(flag_optimize_strlen) Optimization
2253 Enable string length optimizations on trees
2255 fisolate-erroneous-paths-dereference
2256 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2257 Detect paths that trigger erroneous or undefined behavior due to
2258 dereferencing a null pointer. Isolate those paths from the main control
2259 flow and turn the statement with erroneous or undefined behavior into a trap.
2261 fisolate-erroneous-paths-attribute
2262 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2263 Detect paths that trigger erroneous or undefined behavior due a null value
2264 being used in a way forbidden by a returns_nonnull or nonnull
2265 attribute. Isolate those paths from the main control flow and turn the
2266 statement with erroneous or undefined behavior into a trap.
2268 ftree-loop-distribution
2269 Common Report Var(flag_tree_loop_distribution) Optimization
2270 Enable loop distribution on trees
2272 ftree-loop-distribute-patterns
2273 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2274 Enable loop distribution for patterns transformed into a library call
2277 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2278 Enable loop invariant motion on trees
2281 Common Alias(floop-interchange)
2282 Enable loop interchange transforms. Same as -floop-interchange
2285 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2286 Create canonical induction variables in loops
2289 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2290 Enable loop optimizations on tree level
2292 ftree-parallelize-loops=
2293 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1) Optimization
2294 Enable automatic parallelization of loops
2297 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2298 Enable hoisting loads from conditional pointers.
2301 Common Report Var(flag_tree_pre) Optimization
2302 Enable SSA-PRE optimization on trees
2305 Common Report Var(flag_tree_partial_pre) Optimization
2306 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2309 Common Report Var(flag_tree_pta) Optimization
2310 Perform function-local points-to analysis on trees.
2313 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2314 Enable reassociation on tree level
2318 Does nothing. Preserved for backward compatibility.
2321 Common Report Var(flag_tree_sink) Optimization
2322 Enable SSA code sinking on trees
2325 Common Report Var(flag_tree_slsr) Optimization
2326 Perform straight-line strength reduction
2329 Common Report Var(flag_tree_sra) Optimization
2330 Perform scalar replacement of aggregates
2333 Common Report Var(flag_tree_ter) Optimization
2334 Replace temporary expressions in the SSA->normal pass
2337 Common Report Var(flag_tree_live_range_split) Optimization
2338 Perform live range splitting during the SSA->normal pass
2341 Common Report Var(flag_tree_vrp) Init(0) Optimization
2342 Perform Value Range Propagation on trees
2345 Common Report Var(flag_unit_at_a_time) Init(1)
2346 Compile whole compilation unit at a time
2349 Common Report Var(flag_unroll_loops) Optimization
2350 Perform loop unrolling when iteration count is known
2353 Common Report Var(flag_unroll_all_loops) Optimization
2354 Perform loop unrolling for all loops
2356 ; Nonzero means that loop optimizer may assume that the induction variables
2357 ; that control loops do not overflow and that the loops with nontrivial
2358 ; exit condition are not infinite
2359 funsafe-loop-optimizations
2360 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2361 Allow loop optimizations to assume that the loops behave in normal way
2364 Common Report Var(flag_associative_math) SetByCombined Optimization
2365 Allow optimization for floating-point arithmetic which may change the
2366 result of the operation due to rounding.
2369 Common Report Var(flag_reciprocal_math) SetByCombined Optimization
2370 Same as -fassociative-math for expressions which include division.
2372 ; Nonzero means that unsafe floating-point math optimizations are allowed
2373 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2374 ; are allowed to assume that their arguments and results are "normal"
2375 ; (e.g., nonnegative for SQRT).
2376 funsafe-math-optimizations
2377 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2378 Allow math optimizations that may violate IEEE or ISO standards
2381 Common Report Var(flag_unswitch_loops) Optimization
2382 Perform loop unswitching
2385 Common Report Var(flag_unwind_tables) Optimization
2386 Just generate unwind tables for exception handling
2389 Common Driver Negative(fuse-ld=gold)
2390 Use the bfd linker instead of the default linker
2393 Common Driver Negative(fuse-ld=bfd)
2394 Use the gold linker instead of the default linker
2397 Common Undocumented Var(flag_use_linker_plugin)
2399 ; Positive if we should track variables, negative if we should run
2400 ; the var-tracking pass only to discard debug annotations, zero if
2401 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2402 ; will be set according to optimize, debug_info_level and debug_hooks
2403 ; in process_options ().
2405 Common Report Var(flag_var_tracking) Init(2) Optimization
2406 Perform variable tracking
2408 ; Positive if we should track variables at assignments, negative if
2409 ; we should run the var-tracking pass only to discard debug
2410 ; annotations. When flag_var_tracking_assignments ==
2411 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2412 fvar-tracking-assignments
2413 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2414 Perform variable tracking by annotating assignments
2416 ; Nonzero if we should toggle flag_var_tracking_assignments after
2417 ; processing options and computing its default. */
2418 fvar-tracking-assignments-toggle
2419 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2420 Toggle -fvar-tracking-assignments
2422 ; Positive if we should track uninitialized variables, negative if
2423 ; we should run the var-tracking pass only to discard debug
2424 ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
2425 ; will be set according to flag_var_tracking.
2426 fvar-tracking-uninit
2427 Common Report Var(flag_var_tracking_uninit) Optimization
2428 Perform variable tracking and also tag variables that are uninitialized
2431 Common Report Var(flag_tree_vectorize) Optimization
2432 Enable vectorization on trees
2434 ftree-vectorizer-verbose=
2435 Common Joined RejectNegative Ignore
2436 Does nothing. Preserved for backward compatibility.
2438 ftree-loop-vectorize
2439 Common Report Var(flag_tree_loop_vectorize) Optimization
2440 Enable loop vectorization on trees
2443 Common Report Var(flag_tree_slp_vectorize) Optimization
2444 Enable basic block vectorization (SLP) on trees
2447 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT) Optimization
2448 Specifies the cost model for vectorization
2451 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED) Optimization
2452 Specifies the vectorization cost model for code marked with a simd directive
2455 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2458 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2461 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2464 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2467 Common RejectNegative Alias(fvect-cost-model=,dynamic)
2468 Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
2471 Common RejectNegative Alias(fvect-cost-model=,unlimited)
2472 Enables the unlimited vectorizer cost model. Preserved for backward compatibility.
2474 ftree-vect-loop-version
2476 Does nothing. Preserved for backward compatibility.
2479 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2480 Enable copy propagation of scalar-evolution information.
2482 ; -fverbose-asm causes extra commentary information to be produced in
2483 ; the generated assembly code (to make it more readable). This option
2484 ; is generally only of use to those who actually need to read the
2485 ; generated assembly code (perhaps while debugging the compiler itself).
2486 ; -fno-verbose-asm, the default, causes the extra information
2487 ; to not be added and is useful when comparing two assembler files.
2489 Common Report Var(flag_verbose_asm)
2490 Add extra commentary to assembler output
2493 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2494 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2497 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2500 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2503 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2506 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2509 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2512 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2513 Validate vtable pointers before using them.
2516 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2519 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2522 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2525 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2528 Common Var(flag_vtv_counts)
2529 Output vtable verification counters.
2532 Common Var(flag_vtv_debug)
2533 Output vtable verification pointer sets information.
2536 Common Report Var(flag_value_profile_transformations) Optimization
2537 Use expression value profiles in optimizations
2540 Common Report Var(flag_web) Init(2) Optimization
2541 Construct webs and split unrelated uses of single variable
2543 ftree-builtin-call-dce
2544 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2545 Enable conditional dead code elimination for builtin calls
2548 Common Report Var(flag_whole_program) Init(0)
2549 Perform whole program optimizations
2552 Common Report Var(flag_wrapv) Optimization
2553 Assume signed arithmetic overflow wraps around
2555 fzero-initialized-in-bss
2556 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2557 Put zero initialized data in the bss section
2560 Common JoinedOrMissing
2561 Generate debug information in default format
2564 Common JoinedOrMissing Negative(gdwarf)
2565 Generate debug information in COFF format
2568 Common JoinedOrMissing Negative(gdwarf-)
2569 Generate debug information in default version of DWARF format
2572 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2573 Generate debug information in DWARF v2 (or later) format
2576 Common JoinedOrMissing
2577 Generate debug information in default extended format
2580 Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2581 Don't generate DWARF pubnames and pubtypes sections.
2584 Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2585 Generate DWARF pubnames and pubtypes sections.
2588 Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2589 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2591 gno-record-gcc-switches
2592 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2593 Don't record gcc command line switches in DWARF DW_AT_producer.
2595 grecord-gcc-switches
2596 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2597 Record gcc command line switches in DWARF DW_AT_producer.
2600 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2601 Don't generate debug information in separate .dwo files
2604 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2605 Generate debug information in separate .dwo files
2608 Common JoinedOrMissing Negative(gstabs+)
2609 Generate debug information in STABS format
2612 Common JoinedOrMissing Negative(gvms)
2613 Generate debug information in extended STABS format
2616 Common RejectNegative Var(dwarf_strict,0) Init(0)
2617 Emit DWARF additions beyond selected version
2620 Common Report RejectNegative Var(dwarf_strict,1)
2621 Don't emit DWARF additions beyond selected version
2624 Common Report Var(flag_gtoggle)
2625 Toggle debug information generation
2628 Common JoinedOrMissing Negative(gxcoff)
2629 Generate debug information in VMS format
2632 Common JoinedOrMissing Negative(gxcoff+)
2633 Generate debug information in XCOFF format
2636 Common JoinedOrMissing Negative(gcoff)
2637 Generate debug information in extended XCOFF format
2640 Name(compressed_debug_sections) Type(int)
2642 ; Since -gz= is completely handled in specs, the values aren't used and we
2643 ; assign arbitrary constants.
2645 Enum(compressed_debug_sections) String(none) Value(0)
2648 Enum(compressed_debug_sections) String(zlib) Value(1)
2651 Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
2655 Generate compressed debug sections
2658 Common Driver Joined Enum(compressed_debug_sections)
2659 -gz=<format> Generate compressed debug sections in format <format>
2662 Driver Joined Separate
2665 Common Joined Var(plugindir_string) Init(0)
2666 -iplugindir=<dir> Set <dir> to be the default plugin directory
2669 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2670 -imultiarch <dir> Set <dir> to be the multiarch include subdirectory
2673 Driver Joined Separate
2678 no-canonical-prefixes
2691 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2692 -o <file> Place output into <file>
2695 Common Var(profile_flag)
2696 Enable function profiling
2699 Driver Var(pass_exit_codes)
2702 Common Alias(Wpedantic)
2705 Common Var(flag_pedantic_errors)
2706 Like -pedantic but issue them as errors
2712 Driver Var(use_pipes)
2715 Driver JoinedOrMissing Var(print_file_name)
2717 print-libgcc-file-name
2720 print-multi-directory
2721 Driver Var(print_multi_directory)
2724 Driver Var(print_multi_lib)
2726 print-multi-os-directory
2727 Driver Var(print_multi_os_directory)
2730 Driver Var(print_multiarch)
2733 Driver JoinedOrMissing Var(print_prog_name)
2736 Driver Var(print_search_dirs)
2739 Driver Var(print_sysroot)
2741 print-sysroot-headers-suffix
2742 Driver Var(print_sysroot_headers_suffix)
2745 Common Var(quiet_flag) RejectDriver
2746 Do not display functions compiled or elapsed time
2764 Driver Var(report_times)
2767 Driver JoinedOrMissing
2770 Driver Joined Separate
2774 ; C option, but driver must not handle as "-u ndef".
2777 Common Driver Var(verbose_flag)
2778 Enable verbose output
2781 Common Var(version_flag) RejectDriver
2782 Display the compiler's version
2785 Common Var(inhibit_warnings)
2789 Driver Separate Var(wrapper_string)
2792 Driver Joined Separate
2795 Driver RejectNegative Negative(pie)
2796 Create a shared library
2802 Driver Separate Alias(specs=)
2815 ; Documented for Fortran, but always accepted by driver.
2822 ; Documented for Go, but always accepted by driver.
2840 Driver RejectNegative Negative(shared)
2841 Create a position independent executable
2844 Driver Joined Separate
2847 Common Report Var(flag_ipa_ra) Optimization
2848 Use caller save register across calls if possible
2850 ; This comment is to ensure we retain the blank line above.