1 ; Options for the language- and target-independent parts of the compiler.
3 ; Copyright (C) 2003-2014 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 Var(warn_attributes) Init(1) Warning
534 Warn about inappropriate attribute usage
537 Common Var(warn_cast_align) Warning
538 Warn about pointer casts which increase alignment
541 Common Var(warn_cpp) Init(1) Warning
542 Warn when a #warning directive is encountered
544 Wdeprecated-declarations
545 Common Var(warn_deprecated_decl) Init(1) Warning
546 Warn about uses of __attribute__((deprecated)) declarations
548 Wdisabled-optimization
549 Common Var(warn_disabled_optimization) Warning
550 Warn when an optimization pass is disabled
553 Common Var(warnings_are_errors)
554 Treat all warnings as errors
558 Treat specified warning as error
561 Common Var(extra_warnings) Warning
562 Print extra (possibly unwanted) warnings
565 Common Var(flag_fatal_errors)
566 Exit on the first error occurred
569 Common RejectNegative Joined UInteger
570 -Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
573 Common Var(warn_free_nonheap_object) Init(1) Warning
574 Warn when attempting to free a non-heap object
577 Common Var(warn_inline) Warning
578 Warn when an inlined function cannot be inlined
580 Winvalid-memory-model
581 Common Var(warn_invalid_memory_model) Init(1) Warning
582 Warn when an atomic memory model parameter is known to be outside the valid range.
585 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
588 Common RejectNegative Joined UInteger Warning
589 -Wlarger-than=<number> Warn if an object is larger than <number> bytes
591 Wunsafe-loop-optimizations
592 Common Var(warn_unsafe_loop_optimizations) Warning
593 Warn if the loop cannot be optimized due to nontrivial assumptions.
596 Common Alias(Wsuggest-attribute=noreturn)
599 Common Var(warn_odr_violations) Init(1) Warning
600 Warn about some C++ One Definition Rule violations during link time optimization
603 Common Var(warn_overflow) Init(1) Warning
604 Warn about overflow in arithmetic expressions
607 Common Var(warn_packed) Warning
608 Warn when the packed attribute has no effect on struct layout
611 Common Var(warn_padded) Warning
612 Warn when padding is required to align structure members
615 Common Var(pedantic) Init(0) Warning
616 Issue warnings needed for strict compliance to the standard
619 Common Var(warn_return_local_addr) Init(1) Warning
620 Warn about returning a pointer/reference to a local or temporary variable.
623 Common Var(warn_shadow) Warning
624 Warn when one local variable shadows another
627 Common Var(warn_stack_protect) Warning
628 Warn when not issuing stack smashing protection for some reason
631 Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
632 Warn if stack usage might be larger than specified amount
636 Warn about code which might break strict aliasing rules
639 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
640 Warn about code which might break strict aliasing rules
644 Warn about optimizations that assume that signed overflow is undefined
647 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
648 Warn about optimizations that assume that signed overflow is undefined
650 Wsuggest-attribute=const
651 Common Var(warn_suggest_attribute_const) Warning
652 Warn about functions which might be candidates for __attribute__((const))
654 Wsuggest-attribute=pure
655 Common Var(warn_suggest_attribute_pure) Warning
656 Warn about functions which might be candidates for __attribute__((pure))
658 Wsuggest-attribute=noreturn
659 Common Var(warn_suggest_attribute_noreturn) Warning
660 Warn about functions which might be candidates for __attribute__((noreturn))
663 Common Var(warn_suggest_final_types) Warning
664 Warn about C++ polymorphic types where adding final keyword would improve code quality
666 Wsuggest-final-methods
667 Common Var(warn_suggest_final_methods) Warning
668 Warn about C++ virtual methods where adding final keyword would improve code quality
671 Common Var(warn_system_headers) Warning
672 Do not suppress warnings from system headers
675 Common Var(warn_trampolines) Warning
676 Warn whenever a trampoline is generated
679 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
680 Warn if a comparison is always true or always false due to the limited range of the data type
683 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
684 Warn about uninitialized automatic variables
687 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
688 Warn about maybe uninitialized automatic variables
692 Does nothing. Preserved for backward compatibility.
695 Common Var(warn_unused) Init(0) Warning
696 Enable all -Wunused- warnings
698 Wunused-but-set-parameter
699 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
700 Warn when a function parameter is only set, otherwise unused
702 Wunused-but-set-variable
703 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
704 Warn when a variable is only set, otherwise unused
707 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
708 Warn when a function is unused
711 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
712 Warn when a label is unused
715 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
716 Warn when a function parameter is unused
719 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
720 Warn when an expression value is unused
723 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
724 Warn when a variable is unused
727 Common Var(warn_coverage_mismatch) Init(1) Warning
728 Warn in case profiles in -fprofile-use do not match
730 Wvector-operation-performance
731 Common Var(warn_vector_operation_performance) Warning
732 Warn when a vector operation is compiled outside the SIMD
747 Common Separate Var(aux_info_file_name)
748 -aux-info <file> Emit declaration information into <file>
751 Common Joined Alias(aux-info)
754 Common Separate RejectDriver Var(aux_base_name)
757 Common Separate RejectDriver
767 -d<letters> Enable dumps from specific passes of the compiler
770 Common Separate Var(dump_base_name)
771 -dumpbase <file> Set the file basename to be used for dumps
774 Common Separate Var(dump_dir_name)
775 -dumpdir <dir> Set the directory name to be used for dumps
787 Driver Joined Separate
789 ; This option has historically been passed down to the linker by an
790 ; accident of a %{e*} spec, so ensure it continues to be passed down
791 ; as a single option. The supported option for this purpose is
792 ; -rdynamic. See PR 47390.
796 ; The version of the C++ ABI in use. The following values are allowed:
798 ; 0: The version of the ABI believed most conformant with the C++ ABI
799 ; specification. This ABI may change as bugs are discovered and fixed.
800 ; Therefore, 0 will not necessarily indicate the same ABI in different
803 ; 1: The version of the ABI first used in G++ 3.2. No longer selectable.
805 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
807 ; 3: The version of the ABI that fixes the missing underscore
808 ; in template non-type arguments of pointer type.
810 ; 4: The version of the ABI that introduces unambiguous mangling of
811 ; vector types. First selectable in G++ 4.5.
813 ; 5: The version of the ABI that ignores attribute const/noreturn
814 ; in function pointer mangling, and corrects mangling of decltype and
815 ; function parameters used in other parameters and the return type.
816 ; First selectable in G++ 4.6.
818 ; 6: The version of the ABI that doesn't promote scoped enums to int and
819 ; changes the mangling of template argument packs, const/static_cast,
820 ; prefix ++ and --, and a class scope function used as a template
822 ; First selectable in G++ 4.7.
824 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
825 ; corrects the mangling of lambdas in default argument scope.
826 ; First selectable in G++ 4.8.
828 ; 8: The version of the ABI that corrects the substitution behavior of
829 ; function types with function-cv-qualifiers.
830 ; First selectable in G++ 4.9.
832 ; Additional positive integers will be assigned as new versions of
833 ; the ABI become the default version of the ABI.
835 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(0)
836 The version of the C++ ABI in use
838 faggressive-loop-optimizations
839 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
840 Aggressively optimize loops using language constraints
843 Common Report Var(align_functions,0) Optimization UInteger
844 Align the start of functions
847 Common RejectNegative Joined UInteger Var(align_functions)
850 Common Report Var(align_jumps,0) Optimization UInteger
851 Align labels which are only reached by jumping
854 Common RejectNegative Joined UInteger Var(align_jumps)
857 Common Report Var(align_labels,0) Optimization UInteger
861 Common RejectNegative Joined UInteger Var(align_labels)
864 Common Report Var(align_loops,0) Optimization UInteger
865 Align the start of loops
868 Common RejectNegative Joined UInteger Var(align_loops)
872 Does nothing. Preserved for backward compatibility.
876 Does nothing. Preserved for backward compatibility.
878 fargument-noalias-global
880 Does nothing. Preserved for backward compatibility.
882 fargument-noalias-anything
884 Does nothing. Preserved for backward compatibility.
887 Common Driver Report Joined
888 Select what to sanitize
891 Common Joined RejectNegative Var(common_deferred_options) Defer
892 -fasan-shadow-offset=<number> Use custom shadow memory offset.
896 After diagnosing undefined behavior attempt to continue execution
900 This switch is deprecated; use -fsanitize-recover= instead
902 fsanitize-undefined-trap-on-error
903 Common Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
904 Use trap instead of a library function for undefined behavior sanitization
906 fasynchronous-unwind-tables
907 Common Report Var(flag_asynchronous_unwind_tables) Optimization
908 Generate unwind tables that are exact at each instruction boundary
911 Common Report Var(flag_auto_inc_dec) Init(1)
912 Generate auto-inc/dec instructions
915 Common Report Var(flag_auto_profile) Optimization
916 Use sample profile information for call graph node weights. The default
917 profile file is fbdata.afdo in 'pwd'.
920 Common Joined RejectNegative Var(auto_profile_file)
921 Use sample profile information for call graph node weights. The profile
922 file is specified in the argument.
924 ; -fcheck-bounds causes gcc to generate array bounds checks.
925 ; For C, C++ and ObjC: defaults off.
926 ; For Java: defaults to on.
927 ; For Fortran: defaults to off.
929 Common Report Var(flag_bounds_check)
930 Generate code to check bounds before indexing arrays
933 Common Report Var(flag_branch_on_count_reg) Optimization
934 Replace add, compare, branch with branch on count register
936 fbranch-probabilities
937 Common Report Var(flag_branch_probabilities) Optimization
938 Use profiling information for branch probabilities
940 fbranch-target-load-optimize
941 Common Report Var(flag_branch_target_load_optimize) Optimization
942 Perform branch target load optimization before prologue / epilogue threading
944 fbranch-target-load-optimize2
945 Common Report Var(flag_branch_target_load_optimize2) Optimization
946 Perform branch target load optimization after prologue / epilogue threading
949 Common Report Var(flag_btr_bb_exclusive) Optimization
950 Restrict target load migration not to re-use registers in any basic block
953 Common Joined RejectNegative Var(common_deferred_options) Defer
954 -fcall-saved-<register> Mark <register> as being preserved across functions
957 Common Joined RejectNegative Var(common_deferred_options) Defer
958 -fcall-used-<register> Mark <register> as being corrupted by function calls
960 ; Nonzero for -fcaller-saves: allocate values in regs that need to
961 ; be saved across function calls, if that produces overall better code.
962 ; Optional now, so people can test it.
964 Common Report Var(flag_caller_saves) Optimization
965 Save registers around function calls
968 Common Report Var(flag_check_data_deps)
969 Compare the results of several data dependence analyzers.
972 Common Var(flag_check_new)
973 Check the return value of new in C++
975 fcombine-stack-adjustments
976 Common Report Var(flag_combine_stack_adjustments) Optimization
977 Looks for opportunities to reduce stack adjustments and stack references.
980 Common Report Var(flag_no_common,0) Optimization
981 Do not put uninitialized globals in the common section
985 ; Converted by the driver to -fcompare-debug= options.
988 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
989 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
991 fcompare-debug-second
992 Common Driver RejectNegative Var(flag_compare_debug)
993 Run only the second compilation of -fcompare-debug
996 Common Report Var(flag_compare_elim_after_reload) Optimization
997 Perform comparison elimination after register allocation has finished
1000 Common Var(flag_conserve_stack) Optimization
1001 Do not perform optimizations increasing noticeably stack usage
1004 Common Report Var(flag_cprop_registers) Optimization
1005 Perform a register copy-propagation optimization pass
1008 Common Report Var(flag_crossjumping) Optimization
1009 Perform cross-jumping optimization
1012 Common Report Var(flag_cse_follow_jumps) Optimization
1013 When running CSE, follow jumps to their targets
1017 Does nothing. Preserved for backward compatibility.
1020 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
1021 Omit range reduction step when performing complex division
1024 Common Report Var(flag_cx_fortran_rules) Optimization
1025 Complex multiplication and division follow Fortran rules
1028 Common Report Var(flag_data_sections) Optimization
1029 Place data items into their own section
1032 Common Report Var(common_deferred_options) Defer
1033 List all available debugging counters with their limits and counts.
1036 Common RejectNegative Joined Var(common_deferred_options) Defer
1037 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
1040 Common Joined RejectNegative Var(common_deferred_options) Defer
1041 Map one directory name to another in debug information
1043 fdebug-types-section
1044 Common Report Var(flag_debug_types_section) Init(0)
1045 Output .debug_types section when using DWARF v4 debuginfo.
1047 ; Nonzero for -fdefer-pop: don't pop args after each function call
1048 ; instead save them up to pop many calls' args with one insns.
1050 Common Report Var(flag_defer_pop) Optimization
1051 Defer popping functions args from stack until later
1054 Common Report Var(flag_delayed_branch) Optimization
1055 Attempt to fill delay slots of branch instructions
1057 fdelete-dead-exceptions
1058 Common Report Var(flag_delete_dead_exceptions) Init(0)
1059 Delete dead instructions that may throw exceptions
1061 fdelete-null-pointer-checks
1062 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
1063 Delete useless null pointer checks
1065 fdevirtualize-speculatively
1066 Common Report Var(flag_devirtualize_speculatively) Optimization
1067 Perform speculative devirtualization
1070 Common Report Var(flag_devirtualize) Optimization
1071 Try to convert virtual calls to direct ones.
1073 fdiagnostics-show-location=
1074 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1075 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
1077 ; Required for these enum values.
1082 Name(diagnostic_prefixing_rule) Type(int)
1085 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1088 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1090 fdiagnostics-show-caret
1091 Common Var(flag_diagnostics_show_caret) Init(1)
1092 Show the source line with a caret indicating the column
1095 Common Alias(fdiagnostics-color=,always,never)
1099 Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1100 -fdiagnostics-color=[never|always|auto] Colorize diagnostics
1102 ; Required for these enum values.
1107 Name(diagnostic_color_rule) Type(int)
1110 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1113 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1116 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1118 fdiagnostics-show-option
1119 Common Var(flag_diagnostics_show_option) Init(1)
1120 Amend appropriate diagnostic messages with the command line option that controls them
1123 Common Joined RejectNegative Var(common_deferred_options) Defer
1124 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1127 Common Joined RejectNegative Var(common_deferred_options) Defer
1128 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1131 Common Joined RejectNegative Var(common_deferred_options) Defer
1132 -fdump-<type> Dump various compiler internals to a file
1135 Driver RejectNegative
1138 Common RejectNegative Joined Var(flag_dump_final_insns)
1139 -fdump-final-insns=filename Dump to filename the insns at the end of translation
1142 Common RejectNegative Joined Var(flag_dump_go_spec)
1143 -fdump-go-spec=filename Write all declarations to file as Go code
1146 Common Report Var(flag_dump_noaddr)
1147 Suppress output of addresses in debugging dumps
1150 Common Driver Var(flag_report_bug)
1151 Collect and dump debug information into temporary file if ICE in C/C++
1155 Common Var(flag_dump_passes) Init(0)
1156 Dump optimization passes
1159 Common Report Var(flag_dump_unnumbered)
1160 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1162 fdump-unnumbered-links
1163 Common Report Var(flag_dump_unnumbered_links)
1164 Suppress output of previous and next insn numbers in debugging dumps
1167 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1168 Enable CFI tables via GAS assembler directives.
1171 Common Report Var(flag_early_inlining) Init(1) Optimization
1172 Perform early inlining
1174 feliminate-dwarf2-dups
1175 Common Report Var(flag_eliminate_dwarf2_dups)
1176 Perform DWARF2 duplicate elimination
1179 Common Report Var(flag_ipa_sra) Init(0) Optimization
1180 Perform interprocedural reduction of aggregates
1182 feliminate-unused-debug-symbols
1183 Common Report Var(flag_debug_only_used_symbols)
1184 Perform unused type elimination in debug info
1186 feliminate-unused-debug-types
1187 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1188 Perform unused type elimination in debug info
1190 femit-class-debug-always
1191 Common Report Var(flag_emit_class_debug_always) Init(0)
1192 Do not suppress C++ class debug information.
1195 Common Report Var(flag_exceptions) Optimization
1196 Enable exception handling
1198 fexpensive-optimizations
1199 Common Report Var(flag_expensive_optimizations) Optimization
1200 Perform a number of minor, expensive optimizations
1203 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1204 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1207 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1210 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1213 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1219 Common Var(flag_fat_lto_objects)
1220 Output lto objects containing both the intermediate language and binary output.
1223 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1224 Assume no NaNs or infinities are generated
1227 Common Joined RejectNegative Var(common_deferred_options) Defer
1228 -ffixed-<register> Mark <register> as being unavailable to the compiler
1231 Common Report Var(flag_float_store) Optimization
1232 Don't allocate floats and doubles in extended-precision registers
1236 Does nothing. Preserved for backward compatibility.
1239 Common Report Var(flag_forward_propagate) Optimization
1240 Perform a forward propagation pass on RTL
1243 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1244 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1247 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1250 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1252 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1254 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1257 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1259 ; Nonzero means don't put addresses of constant functions in registers.
1260 ; Used for compiling the Unix kernel, where strange substitutions are
1261 ; done on the assembly output.
1263 Common Report Var(flag_no_function_cse,0)
1264 Allow function addresses to be held in registers
1267 Common Report Var(flag_function_sections)
1268 Place each function into its own section
1271 Common Report Var(flag_gcse) Optimization
1272 Perform global common subexpression elimination
1275 Common Report Var(flag_gcse_lm) Init(1) Optimization
1276 Perform enhanced load motion during global common subexpression elimination
1279 Common Report Var(flag_gcse_sm) Init(0) Optimization
1280 Perform store motion after global common subexpression elimination
1283 Common Report Var(flag_gcse_las) Init(0) Optimization
1284 Perform redundant load after store elimination in global common subexpression
1288 Common Report Var(flag_gcse_after_reload) Optimization
1289 Perform global common subexpression elimination after register allocation
1292 ; This option is not documented yet as its semantics will change.
1294 Common Report Var(flag_graphite)
1295 Enable in and out of Graphite representation
1298 Common Report Var(flag_graphite_identity) Optimization
1299 Enable Graphite Identity transformation
1301 fhoist-adjacent-loads
1302 Common Report Var(flag_hoist_adjacent_loads) Optimization
1303 Enable hoisting adjacent loads to encourage generating conditional move
1306 floop-parallelize-all
1307 Common Report Var(flag_loop_parallelize_all) Optimization
1308 Mark all loops as parallel
1311 Common Report Var(flag_loop_strip_mine) Optimization
1312 Enable Loop Strip Mining transformation
1315 Common Report Var(flag_loop_interchange) Optimization
1316 Enable Loop Interchange transformation
1319 Common Report Var(flag_loop_block) Optimization
1320 Enable Loop Blocking transformation
1322 floop-unroll-and-jam
1323 Common Report Var(flag_loop_unroll_jam) Optimization
1324 Enable Loop Unroll Jam transformation
1327 Common Report Var(flag_tm)
1328 Enable support for GNU transactional memory
1331 Common Report Var(flag_gnu_unique) Init(1)
1332 Use STB_GNU_UNIQUE if supported by the assembler
1336 Does nothing. Preserved for backward compatibility.
1339 Common Report Var(flag_loop_optimize_isl) Optimization
1340 Enable the ISL based loop nest optimizer
1342 fstrict-volatile-bitfields
1343 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1344 Force bitfield accesses to match their type width
1346 fguess-branch-probability
1347 Common Report Var(flag_guess_branch_prob) Optimization
1348 Enable guessing of branch probabilities
1350 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1351 ; Generate position-independent code for executables if possible
1352 ; On SVR4 targets, it also controls whether or not to emit a
1353 ; string identifying the compiler.
1355 Common Report Var(flag_no_ident,0)
1356 Process #ident directives
1359 Common Report Var(flag_if_conversion) Optimization
1360 Perform conversion of conditional jumps to branchless equivalents
1363 Common Report Var(flag_if_conversion2) Optimization
1364 Perform conversion of conditional jumps to conditional execution
1367 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1368 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1371 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1374 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1377 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1380 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1382 ftree-loop-if-convert
1383 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1384 Convert conditional jumps in innermost loops to branchless equivalents
1386 ftree-loop-if-convert-stores
1387 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1388 Also if-convert conditional jumps containing memory writes
1390 ; -finhibit-size-directive inhibits output of .size for ELF.
1391 ; This is used only for compiling crtstuff.c,
1392 ; and it may be extended to other effects
1393 ; needed for crtstuff.c on other systems.
1394 finhibit-size-directive
1395 Common Report Var(flag_inhibit_size_directive)
1396 Do not generate .size directives
1399 Common Report Var(flag_indirect_inlining) Optimization
1400 Perform indirect inlining
1402 ; General flag to enable inlining. Specifying -fno-inline will disable
1403 ; all inlining apart from always-inline functions.
1405 Common Report Var(flag_no_inline,0) Init(0) Optimization
1406 Enable inlining of function declared \"inline\", disabling disables all inlining
1408 finline-small-functions
1409 Common Report Var(flag_inline_small_functions) Optimization
1410 Integrate functions into their callers when code size is known not to grow
1413 Common Report Var(flag_inline_functions) Optimization
1414 Integrate functions not declared \"inline\" into their callers when profitable
1416 finline-functions-called-once
1417 Common Report Var(flag_inline_functions_called_once) Optimization
1418 Integrate functions only required by their single caller
1421 Common RejectNegative Joined Alias(finline-limit=)
1424 Common RejectNegative Joined UInteger
1425 -finline-limit=<number> Limit the size of inlined functions to <number>
1428 Common Report Var(flag_inline_atomics) Init(1) Optimization
1429 Inline __atomic operations when a lock free instruction sequence is available.
1431 finstrument-functions
1432 Common Report Var(flag_instrument_function_entry_exit)
1433 Instrument function entry and exit with profiling calls
1435 finstrument-functions-exclude-function-list=
1436 Common RejectNegative Joined
1437 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1439 finstrument-functions-exclude-file-list=
1440 Common RejectNegative Joined
1441 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1444 Common Report Var(flag_ipa_cp) Optimization
1445 Perform interprocedural constant propagation
1448 Common Report Var(flag_ipa_cp_clone) Optimization
1449 Perform cloning to make Interprocedural constant propagation stronger
1452 Common Report Var(flag_ipa_profile) Init(0) Optimization
1453 Perform interprocedural profile propagation
1456 Common Report Var(flag_ipa_pta) Init(0) Optimization
1457 Perform interprocedural points-to analysis
1460 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1461 Discover pure and const functions
1464 Common Report Var(flag_ipa_icf) Optimization
1465 Perform Identical Code Folding for functions and read-only variables
1468 Common Report Var(flag_ipa_icf_functions) Optimization
1469 Perform Identical Code Folding for functions
1472 Common Report Var(flag_ipa_icf_variables) Optimization
1473 Perform Identical Code Folding for variables
1476 Common Report Var(flag_ipa_reference) Init(0) Optimization
1477 Discover readonly and non addressable static variables
1481 Does nothing. Preserved for backward compatibility.
1485 Does nothing. Preserved for backward compatibility.
1488 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1489 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1492 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1495 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1498 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1501 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1502 -fira-region=[one|all|mixed] Set regions for IRA
1505 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1508 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1511 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1514 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1517 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1518 Use IRA based register pressure calculation
1519 in RTL hoist optimizations.
1522 Common Report Var(flag_ira_loop_pressure) Optimization
1523 Use IRA based register pressure calculation
1524 in RTL loop optimizations.
1526 fira-share-save-slots
1527 Common Report Var(flag_ira_share_save_slots) Init(1)
1528 Share slots for saving different hard registers.
1530 fira-share-spill-slots
1531 Common Report Var(flag_ira_share_spill_slots) Init(1)
1532 Share stack slots for spilled pseudo-registers.
1535 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1536 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1539 Common Report Var(flag_ivopts) Init(1) Optimization
1540 Optimize induction variables on trees
1543 Common Var(flag_jump_tables) Init(1) Optimization
1544 Use jump tables for sufficiently large switch statements
1546 fkeep-inline-functions
1547 Common Report Var(flag_keep_inline_functions)
1548 Generate code for functions even if they are fully inlined
1551 Common Report Var(flag_keep_static_consts) Init(1)
1552 Emit static const variables even if they are not used
1555 Common Report Var(flag_leading_underscore) Init(-1)
1556 Give external symbols a leading underscore
1560 Does nothing. Preserved for backward compatibility.
1563 Common Report Var(flag_lra_remat) Optimization
1564 Do CFG-sensitive rematerialization in LRA
1568 Enable link-time optimization.
1571 Common RejectNegative Joined Var(flag_lto)
1572 Link-time optimization with number of parallel jobs or jobserver.
1575 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1578 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1581 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1584 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1587 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1590 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1593 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1594 Specify the algorithm to partition symbols and vars at linktime
1596 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1597 flto-compression-level=
1598 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1599 -flto-compression-level=<number> Use zlib compression level <number> for IL
1601 flto-odr-type-merging
1602 Common Report Var(flag_lto_odr_type_mering) Init(1)
1603 Merge C++ types using One Definition Rule
1606 Common Report Var(flag_lto_report) Init(0)
1607 Report various link-time optimization statistics
1610 Common Report Var(flag_lto_report_wpa) Init(0)
1611 Report various link-time optimization statistics for WPA only
1614 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1615 Set errno after built-in math functions
1618 Common Joined RejectNegative UInteger Var(flag_max_errors)
1619 -fmax-errors=<number> Maximum number of errors to report
1622 Common Report Var(mem_report)
1623 Report on permanent memory allocation
1626 Common Report Var(mem_report_wpa)
1627 Report on permanent memory allocation in WPA only
1629 ; This will attempt to merge constant section constants, if 1 only
1630 ; string constants and constants from constant pool, if 2 also constant
1632 fmerge-all-constants
1633 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1634 Attempt to merge identical constants and constant variables
1637 Common Report Var(flag_merge_constants,1) Optimization
1638 Attempt to merge identical constants across compilation units
1640 fmerge-debug-strings
1641 Common Report Var(flag_merge_debug_strings) Init(1)
1642 Attempt to merge identical debug strings across compilation units
1645 Common RejectNegative Joined UInteger
1646 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1649 Common Report Var(flag_modulo_sched) Optimization
1650 Perform SMS based modulo scheduling before the first scheduling pass
1652 fmodulo-sched-allow-regmoves
1653 Common Report Var(flag_modulo_sched_allow_regmoves)
1654 Perform SMS based modulo scheduling with register moves allowed
1656 fmove-loop-invariants
1657 Common Report Var(flag_move_loop_invariants) Optimization
1658 Move loop invariant computations out of loops
1661 Common Var(flag_dce) Init(1) Optimization
1662 Use the RTL dead code elimination pass
1665 Common Var(flag_dse) Init(1) Optimization
1666 Use the RTL dead store elimination pass
1668 freschedule-modulo-scheduled-loops
1669 Common Report Var(flag_resched_modulo_sched) Optimization
1670 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1672 fnon-call-exceptions
1673 Common Report Var(flag_non_call_exceptions) Optimization
1674 Support synchronous non-call exceptions
1677 Common Driver Joined MissingArgError(options or targets missing after %qs)
1678 -foffload=<targets>=<options> Specify offloading targets and options for them
1681 Common Joined RejectNegative Enum(offload_abi) Var(flag_offload_abi) Init(OFFLOAD_ABI_UNSET)
1682 -foffload-abi=[lp64|ilp32] Set the ABI to use in an offload compiler
1685 Name(offload_abi) Type(enum offload_abi) UnknownError(unknown offload ABI %qs)
1688 Enum(offload_abi) String(ilp32) Value(OFFLOAD_ABI_ILP32)
1691 Enum(offload_abi) String(lp64) Value(OFFLOAD_ABI_LP64)
1694 Common Report Var(flag_omit_frame_pointer) Optimization
1695 When possible do not generate stack frames
1698 Common Report Var(flag_opt_info) Optimization
1699 Enable all optimization info dumps on stderr
1702 Common Joined RejectNegative Var(common_deferred_options) Defer
1703 -fopt-info[-<type>=filename] Dump compiler optimization details
1705 foptimize-register-move
1707 Does nothing. Preserved for backward compatibility.
1709 foptimize-sibling-calls
1710 Common Report Var(flag_optimize_sibling_calls) Optimization
1711 Optimize sibling and tail recursive calls
1714 Common Report Var(flag_partial_inlining)
1715 Perform partial inlining
1718 Common Report Var(pre_ipa_mem_report)
1719 Report on memory allocation before interprocedural optimization
1721 fpost-ipa-mem-report
1722 Common Report Var(post_ipa_mem_report)
1723 Report on memory allocation before interprocedural optimization
1726 Common Report Var(flag_pack_struct) Optimization
1727 Pack structure members together without holes
1730 Common RejectNegative Joined UInteger Optimization
1731 -fpack-struct=<number> Set initial maximum structure member alignment
1734 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1735 Return small aggregates in memory, not registers
1738 Common Report Var(flag_peel_loops) Optimization
1739 Perform loop peeling
1742 Common Report Var(flag_no_peephole,0) Optimization
1743 Enable machine specific peephole optimizations
1746 Common Report Var(flag_peephole2) Optimization
1747 Enable an RTL peephole pass before sched2
1750 Common Report Var(flag_pic,2) Negative(fPIE)
1751 Generate position-independent code if possible (large mode)
1754 Common Report Var(flag_pie,2) Negative(fpic)
1755 Generate position-independent code for executables if possible (large mode)
1758 Common Report Var(flag_pic,1) Negative(fpie)
1759 Generate position-independent code if possible (small mode)
1762 Common Report Var(flag_pie,1) Negative(fPIC)
1763 Generate position-independent code for executables if possible (small mode)
1766 Common Joined RejectNegative Var(common_deferred_options) Defer
1767 Specify a plugin to load
1770 Common Joined RejectNegative Var(common_deferred_options) Defer
1771 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1773 fpredictive-commoning
1774 Common Report Var(flag_predictive_commoning) Optimization
1775 Run predictive commoning optimization.
1777 fprefetch-loop-arrays
1778 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1779 Generate prefetch instructions, if available, for arrays in loops
1782 Common Report Var(profile_flag)
1783 Enable basic program profiling code
1786 Common Report Var(profile_arc_flag)
1787 Insert arc-based program profiling code
1790 Common Joined RejectNegative Var(profile_data_prefix)
1791 Set the top-level directory for storing the profile data.
1792 The default is 'pwd'.
1795 Common Report Var(flag_profile_correction)
1796 Enable correction of flow inconsistent profile data input
1800 Enable common options for generating profile info for profile feedback directed optimizations
1803 Common Joined RejectNegative
1804 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1807 Common Var(flag_profile_use)
1808 Enable common options for performing profile feedback directed optimizations
1811 Common Joined RejectNegative
1812 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1815 Common Report Var(flag_profile_values)
1816 Insert code to profile values of expressions
1819 Common Report Var(profile_report)
1820 Report on consistency of profile
1822 fprofile-reorder-functions
1823 Common Report Var(flag_profile_reorder_functions)
1824 Enable function reordering that improves code placement
1827 Common Var(common_deferred_options) Defer
1830 Common Joined RejectNegative Var(common_deferred_options) Defer
1831 -frandom-seed=<number> Make compile reproducible using <number>
1833 ; This switch causes the command line that was used to create an
1834 ; object file to be recorded into the object file. The exact format
1835 ; of this recording is target and binary file format dependent.
1836 ; It is related to the -fverbose-asm switch, but that switch only
1837 ; records information in the assembler output file as comments, so
1838 ; they never reach the object file.
1839 frecord-gcc-switches
1840 Common Report Var(flag_record_gcc_switches)
1841 Record gcc command line switches in the object file.
1844 Common Report Var(flag_pcc_struct_return,0) Optimization
1845 Return small aggregates in registers
1849 Does nothing. Preserved for backward compatibility.
1851 flive-range-shrinkage
1852 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
1853 Relief of register pressure through live range shrinkage
1856 Common Report Var(flag_rename_registers) Init(2) Optimization
1857 Perform a register renaming optimization pass
1860 Common Report Var(flag_schedule_fusion) Init(2) Optimization
1861 Perform a target dependent instruction fusion optimization pass
1864 Common Report Var(flag_reorder_blocks) Optimization
1865 Reorder basic blocks to improve code placement
1867 freorder-blocks-and-partition
1868 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1869 Reorder basic blocks and partition into hot and cold sections
1872 Common Report Var(flag_reorder_functions) Optimization
1873 Reorder functions to improve code placement
1875 frerun-cse-after-loop
1876 Common Report Var(flag_rerun_cse_after_loop) Optimization
1877 Add a common subexpression elimination pass after loop optimizations
1881 Does nothing. Preserved for backward compatibility.
1884 Common Report Var(flag_rounding_math) Optimization SetByCombined
1885 Disable optimizations that assume default FP rounding behavior
1888 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1889 Enable scheduling across basic blocks
1892 Common Report Var(flag_sched_pressure) Init(0) Optimization
1893 Enable register pressure sensitive insn scheduling
1896 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1897 Allow speculative motion of non-loads
1900 Common Report Var(flag_schedule_speculative_load) Optimization
1901 Allow speculative motion of some loads
1903 fsched-spec-load-dangerous
1904 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1905 Allow speculative motion of more loads
1908 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1909 -fsched-verbose=<number> Set the verbosity level of the scheduler
1911 fsched2-use-superblocks
1912 Common Report Var(flag_sched2_use_superblocks) Optimization
1913 If scheduling post reload, do superblock scheduling
1917 Does nothing. Preserved for backward compatibility.
1920 Common Report Var(flag_schedule_insns) Optimization
1921 Reschedule instructions before register allocation
1924 Common Report Var(flag_schedule_insns_after_reload) Optimization
1925 Reschedule instructions after register allocation
1927 ; This flag should be on when a target implements non-trivial
1928 ; scheduling hooks, maybe saving some information for its own sake.
1929 ; On IA64, for example, this is used for correct bundling.
1930 fselective-scheduling
1931 Common Report Var(flag_selective_scheduling) Optimization
1932 Schedule instructions using selective scheduling algorithm
1934 fselective-scheduling2
1935 Common Report Var(flag_selective_scheduling2) Optimization
1936 Run selective scheduling after reload
1938 fsel-sched-pipelining
1939 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1940 Perform software pipelining of inner loops during selective scheduling
1942 fsel-sched-pipelining-outer-loops
1943 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1944 Perform software pipelining of outer loops during selective scheduling
1946 fsel-sched-reschedule-pipelined
1947 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1948 Reschedule pipelined regions without pipelining
1950 fsemantic-interposition
1951 Common Report Var(flag_semantic_interposition) Init(1)
1952 Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker
1954 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1955 ; of stalled insns into the ready list.
1956 fsched-stalled-insns
1957 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1958 Allow premature scheduling of queued insns
1960 fsched-stalled-insns=
1961 Common RejectNegative Joined UInteger
1962 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1964 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1965 ; be examined for a dependency on a stalled insn that is candidate for
1966 ; premature removal from the queue of stalled insns into the ready list (has
1967 ; an effect only if the flag 'sched_stalled_insns' is set).
1968 fsched-stalled-insns-dep
1969 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1970 Set dependence distance checking in premature scheduling of queued insns
1972 fsched-stalled-insns-dep=
1973 Common RejectNegative Joined UInteger
1974 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1976 fsched-group-heuristic
1977 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1978 Enable the group heuristic in the scheduler
1980 fsched-critical-path-heuristic
1981 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1982 Enable the critical path heuristic in the scheduler
1984 fsched-spec-insn-heuristic
1985 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1986 Enable the speculative instruction heuristic in the scheduler
1988 fsched-rank-heuristic
1989 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1990 Enable the rank heuristic in the scheduler
1992 fsched-last-insn-heuristic
1993 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1994 Enable the last instruction heuristic in the scheduler
1996 fsched-dep-count-heuristic
1997 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1998 Enable the dependent count heuristic in the scheduler
2001 Common Report Var(flag_section_anchors) Optimization
2002 Access data in the same section from shared anchor points
2006 Does nothing. Preserved for backward compatibility.
2010 Does nothing. Preserved for backward compatibility.
2013 Common Report Var(flag_ree) Init(0)
2014 Turn on Redundant Extensions Elimination pass.
2017 Common Report Var(flag_show_column) Init(1)
2018 Show column numbers in diagnostics, when available. Default on
2021 Common Report Var(flag_shrink_wrap) Optimization
2022 Emit function prologues only before parts of the function that need it,
2023 rather than at the top of the function.
2026 Common Report Var(flag_signaling_nans) Optimization SetByCombined
2027 Disable optimizations observable by IEEE signaling NaNs
2030 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
2031 Disable floating point optimizations that ignore the IEEE signedness of zero
2033 fsingle-precision-constant
2034 Common Report Var(flag_single_precision_constant) Optimization
2035 Convert floating point constants to single precision constants
2037 fsplit-ivs-in-unroller
2038 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
2039 Split lifetimes of induction variables when loops are unrolled
2042 Common Report Var(flag_split_stack) Init(-1)
2043 Generate discontiguous stack frames
2046 Common Report Var(flag_split_wide_types) Optimization
2047 Split wide types into independent registers
2050 Common Report Var(flag_ssa_phiopt) Optimization
2051 Optimize conditional patterns using SSA PHI nodes
2053 fvariable-expansion-in-unroller
2054 Common Report Var(flag_variable_expansion_in_unroller) Optimization
2055 Apply variable expansion when loops are unrolled
2058 Common Report RejectNegative Joined
2059 -fstack-check=[no|generic|specific] Insert stack checking code into the program
2062 Common Alias(fstack-check=, specific, no)
2063 Insert stack checking code into the program. Same as -fstack-check=specific
2066 Common Var(common_deferred_options) Defer
2068 fstack-limit-register=
2069 Common RejectNegative Joined Var(common_deferred_options) Defer
2070 -fstack-limit-register=<register> Trap if the stack goes past <register>
2072 fstack-limit-symbol=
2073 Common RejectNegative Joined Var(common_deferred_options) Defer
2074 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
2077 Common Report Var(flag_stack_protect, 1)
2078 Use propolice as a stack protection method
2080 fstack-protector-all
2081 Common Report RejectNegative Var(flag_stack_protect, 2)
2082 Use a stack protection method for every function
2084 fstack-protector-strong
2085 Common Report RejectNegative Var(flag_stack_protect, 3)
2086 Use a smart stack protection method for certain functions
2089 Common RejectNegative Var(flag_stack_usage)
2090 Output stack usage information on a per-function basis
2094 Does nothing. Preserved for backward compatibility.
2096 ; Nonzero if we should do (language-dependent) alias analysis.
2097 ; Typically, this analysis will assume that expressions of certain
2098 ; types do not alias expressions of certain other types. Only used
2099 ; if alias analysis (in general) is enabled.
2101 Common Report Var(flag_strict_aliasing) Optimization
2102 Assume strict aliasing rules apply
2105 Common Report Var(flag_strict_overflow)
2106 Treat signed overflow as undefined
2109 Common Report Var(flag_sync_libcalls) Init(1)
2110 Implement __atomic operations via libcalls to legacy __sync functions
2113 Common Report Var(flag_syntax_only)
2114 Check for syntax errors, then stop
2117 Common Report Var(flag_test_coverage)
2118 Create data files needed by \"gcov\"
2121 Common Report Var(flag_thread_jumps) Optimization
2122 Perform jump threading optimizations
2125 Common Report Var(time_report)
2126 Report the time taken by each compiler pass
2129 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2130 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
2133 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2136 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2139 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2142 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2145 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2148 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
2149 Reorder top level functions, variables, and asms
2152 Common Report Var(flag_tracer)
2153 Perform superblock formation via tail duplication
2155 ; Zero means that floating-point math operations cannot generate a
2156 ; (user-visible) trap. This is the case, for example, in nonstop
2157 ; IEEE 754 arithmetic.
2159 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2160 Assume floating-point operations can trap
2163 Common Report Var(flag_trapv) Optimization
2164 Trap for signed overflow in addition, subtraction and multiplication
2167 Common Report Var(flag_tree_ccp) Optimization
2168 Enable SSA-CCP optimization on trees
2171 Common Report Var(flag_tree_bit_ccp) Optimization
2172 Enable SSA-BIT-CCP optimization on trees
2176 Does nothing. Preserved for backward compatibility.
2179 Common Report Var(flag_tree_ch) Optimization
2180 Enable loop header copying on trees
2182 ftree-coalesce-inlined-vars
2183 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2184 Enable coalescing of copy-related user variables that are inlined
2187 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2188 Enable coalescing of all copy-related user variables
2191 Common Report Var(flag_tree_copyrename) Optimization
2192 Replace SSA temporaries with better names in copies
2195 Common Report Var(flag_tree_copy_prop) Optimization
2196 Enable copy propagation on trees
2198 ftree-store-copy-prop
2200 Does nothing. Preserved for backward compatibility.
2203 Common Report Var(flag_tree_cselim) Init(2) Optimization
2204 Transform condition stores into unconditional ones
2206 ftree-switch-conversion
2207 Common Report Var(flag_tree_switch_conversion) Optimization
2208 Perform conversions of switch initializations.
2211 Common Report Var(flag_tree_dce) Optimization
2212 Enable SSA dead code elimination optimization on trees
2214 ftree-dominator-opts
2215 Common Report Var(flag_tree_dom) Optimization
2216 Enable dominator optimizations
2219 Common Report Var(flag_tree_tail_merge) Optimization
2220 Enable tail merging on trees
2223 Common Report Var(flag_tree_dse) Optimization
2224 Enable dead store elimination
2227 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2228 Enable forward propagation on trees
2231 Common Report Var(flag_tree_fre) Optimization
2232 Enable Full Redundancy Elimination (FRE) on trees
2235 Common Report Var(flag_optimize_strlen) Optimization
2236 Enable string length optimizations on trees
2238 fisolate-erroneous-paths-dereference
2239 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2240 Detect paths which trigger erroneous or undefined behaviour due to
2241 dereferencing a NULL pointer. Isolate those paths from the main control
2242 flow and turn the statement with erroneous or undefined behaviour into a trap.
2244 fisolate-erroneous-paths-attribute
2245 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2246 Detect paths which trigger erroneous or undefined behaviour due a NULL value
2247 being used in a way which is forbidden by a returns_nonnull or nonnull
2248 attribute. Isolate those paths from the main control flow and turn the
2249 statement with erroneous or undefined behaviour into a trap.
2251 ftree-loop-distribution
2252 Common Report Var(flag_tree_loop_distribution) Optimization
2253 Enable loop distribution on trees
2255 ftree-loop-distribute-patterns
2256 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2257 Enable loop distribution for patterns transformed into a library call
2260 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2261 Enable loop invariant motion on trees
2264 Common Alias(floop-interchange)
2265 Enable loop interchange transforms. Same as -floop-interchange
2268 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2269 Create canonical induction variables in loops
2272 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2273 Enable loop optimizations on tree level
2275 ftree-parallelize-loops=
2276 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2277 Enable automatic parallelization of loops
2280 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2281 Enable hoisting loads from conditional pointers.
2284 Common Report Var(flag_tree_pre) Optimization
2285 Enable SSA-PRE optimization on trees
2288 Common Report Var(flag_tree_partial_pre) Optimization
2289 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2292 Common Report Var(flag_tree_pta) Optimization
2293 Perform function-local points-to analysis on trees.
2296 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2297 Enable reassociation on tree level
2301 Does nothing. Preserved for backward compatibility.
2304 Common Report Var(flag_tree_sink) Optimization
2305 Enable SSA code sinking on trees
2308 Common Report Var(flag_tree_slsr) Optimization
2309 Perform straight-line strength reduction
2312 Common Report Var(flag_tree_sra) Optimization
2313 Perform scalar replacement of aggregates
2316 Common Report Var(flag_tree_ter) Optimization
2317 Replace temporary expressions in the SSA->normal pass
2320 Common Report Var(flag_tree_live_range_split) Optimization
2321 Perform live range splitting during the SSA->normal pass
2324 Common Report Var(flag_tree_vrp) Init(0) Optimization
2325 Perform Value Range Propagation on trees
2328 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2329 Compile whole compilation unit at a time
2332 Common Report Var(flag_unroll_loops) Optimization
2333 Perform loop unrolling when iteration count is known
2336 Common Report Var(flag_unroll_all_loops) Optimization
2337 Perform loop unrolling for all loops
2339 ; Nonzero means that loop optimizer may assume that the induction variables
2340 ; that control loops do not overflow and that the loops with nontrivial
2341 ; exit condition are not infinite
2342 funsafe-loop-optimizations
2343 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2344 Allow loop optimizations to assume that the loops behave in normal way
2347 Common Report Var(flag_associative_math) SetByCombined
2348 Allow optimization for floating-point arithmetic which may change the
2349 result of the operation due to rounding.
2352 Common Report Var(flag_reciprocal_math) SetByCombined
2353 Same as -fassociative-math for expressions which include division.
2355 ; Nonzero means that unsafe floating-point math optimizations are allowed
2356 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2357 ; are allowed to assume that their arguments and results are "normal"
2358 ; (e.g., nonnegative for SQRT).
2359 funsafe-math-optimizations
2360 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2361 Allow math optimizations that may violate IEEE or ISO standards
2364 Common Report Var(flag_unswitch_loops) Optimization
2365 Perform loop unswitching
2368 Common Report Var(flag_unwind_tables) Optimization
2369 Just generate unwind tables for exception handling
2372 Common Driver Negative(fuse-ld=gold)
2373 Use the bfd linker instead of the default linker
2376 Common Driver Negative(fuse-ld=bfd)
2377 Use the gold linker instead of the default linker
2380 Common Undocumented Var(flag_use_linker_plugin)
2382 ; Positive if we should track variables, negative if we should run
2383 ; the var-tracking pass only to discard debug annotations, zero if
2384 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2385 ; will be set according to optimize, debug_info_level and debug_hooks
2386 ; in process_options ().
2388 Common Report Var(flag_var_tracking) Init(2) Optimization
2389 Perform variable tracking
2391 ; Positive if we should track variables at assignments, negative if
2392 ; we should run the var-tracking pass only to discard debug
2393 ; annotations. When flag_var_tracking_assignments ==
2394 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2395 fvar-tracking-assignments
2396 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2397 Perform variable tracking by annotating assignments
2399 ; Nonzero if we should toggle flag_var_tracking_assignments after
2400 ; processing options and computing its default. */
2401 fvar-tracking-assignments-toggle
2402 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2403 Toggle -fvar-tracking-assignments
2405 ; Positive if we should track uninitialized variables, negative if
2406 ; we should run the var-tracking pass only to discard debug
2407 ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
2408 ; will be set according to flag_var_tracking.
2409 fvar-tracking-uninit
2410 Common Report Var(flag_var_tracking_uninit) Optimization
2411 Perform variable tracking and also tag variables that are uninitialized
2414 Common Report Var(flag_tree_vectorize) Optimization
2415 Enable vectorization on trees
2417 ftree-vectorizer-verbose=
2418 Common Joined RejectNegative Ignore
2419 Does nothing. Preserved for backward compatibility.
2421 ftree-loop-vectorize
2422 Common Report Var(flag_tree_loop_vectorize) Optimization
2423 Enable loop vectorization on trees
2426 Common Report Var(flag_tree_slp_vectorize) Optimization
2427 Enable basic block vectorization (SLP) on trees
2430 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT)
2431 Specifies the cost model for vectorization
2434 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED)
2435 Specifies the vectorization cost model for code marked with a simd directive
2438 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2441 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2444 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2447 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2450 Common RejectNegative Alias(fvect-cost-model=,dynamic)
2451 Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
2454 Common RejectNegative Alias(fvect-cost-model=,unlimited)
2455 Enables the unlimited vectorizer cost model. Preserved for backward compatibility.
2457 ftree-vect-loop-version
2459 Does nothing. Preserved for backward compatibility.
2462 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2463 Enable copy propagation of scalar-evolution information.
2465 ; -fverbose-asm causes extra commentary information to be produced in
2466 ; the generated assembly code (to make it more readable). This option
2467 ; is generally only of use to those who actually need to read the
2468 ; generated assembly code (perhaps while debugging the compiler itself).
2469 ; -fno-verbose-asm, the default, causes the extra information
2470 ; to not be added and is useful when comparing two assembler files.
2472 Common Report Var(flag_verbose_asm)
2473 Add extra commentary to assembler output
2476 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2477 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2480 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2483 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2486 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2489 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2492 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2495 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2496 Validate vtable pointers before using them.
2499 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2502 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2505 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2508 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2511 Common Var(flag_vtv_counts)
2512 Output vtable verification counters.
2515 Common Var(flag_vtv_debug)
2516 Output vtable verification pointer sets information.
2519 Common Report Var(flag_value_profile_transformations) Optimization
2520 Use expression value profiles in optimizations
2523 Common Report Var(flag_web) Init(2) Optimization
2524 Construct webs and split unrelated uses of single variable
2526 ftree-builtin-call-dce
2527 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2528 Enable conditional dead code elimination for builtin calls
2531 Common Report Var(flag_whole_program) Init(0) Optimization
2532 Perform whole program optimizations
2535 Common Report Var(flag_wrapv) Optimization
2536 Assume signed arithmetic overflow wraps around
2538 fzero-initialized-in-bss
2539 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2540 Put zero initialized data in the bss section
2543 Common JoinedOrMissing
2544 Generate debug information in default format
2547 Common JoinedOrMissing Negative(gdwarf)
2548 Generate debug information in COFF format
2551 Common JoinedOrMissing Negative(gdwarf-)
2552 Generate debug information in default version of DWARF format
2555 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2556 Generate debug information in DWARF v2 (or later) format
2559 Common JoinedOrMissing
2560 Generate debug information in default extended format
2563 Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2564 Don't generate DWARF pubnames and pubtypes sections.
2567 Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2568 Generate DWARF pubnames and pubtypes sections.
2571 Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2572 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2574 gno-record-gcc-switches
2575 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2576 Don't record gcc command line switches in DWARF DW_AT_producer.
2578 grecord-gcc-switches
2579 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2580 Record gcc command line switches in DWARF DW_AT_producer.
2583 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2584 Don't generate debug information in separate .dwo files
2587 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2588 Generate debug information in separate .dwo files
2591 Common JoinedOrMissing Negative(gstabs+)
2592 Generate debug information in STABS format
2595 Common JoinedOrMissing Negative(gvms)
2596 Generate debug information in extended STABS format
2599 Common RejectNegative Var(dwarf_strict,0) Init(0)
2600 Emit DWARF additions beyond selected version
2603 Common Report RejectNegative Var(dwarf_strict,1)
2604 Don't emit DWARF additions beyond selected version
2607 Common Report Var(flag_gtoggle)
2608 Toggle debug information generation
2611 Common JoinedOrMissing Negative(gxcoff)
2612 Generate debug information in VMS format
2615 Common JoinedOrMissing Negative(gxcoff+)
2616 Generate debug information in XCOFF format
2619 Common JoinedOrMissing Negative(gcoff)
2620 Generate debug information in extended XCOFF format
2623 Name(compressed_debug_sections) Type(int)
2625 ; Since -gz= is completely handled in specs, the values aren't used and we
2626 ; assign arbitrary constants.
2628 Enum(compressed_debug_sections) String(none) Value(0)
2631 Enum(compressed_debug_sections) String(zlib) Value(1)
2634 Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
2638 Generate compressed debug sections
2641 Common Driver Joined Enum(compressed_debug_sections)
2642 -gz=<format> Generate compressed debug sections in format <format>
2645 Driver Joined Separate
2648 Common Joined Var(plugindir_string) Init(0)
2649 -iplugindir=<dir> Set <dir> to be the default plugin directory
2652 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2653 -imultiarch <dir> Set <dir> to be the multiarch include subdirectory
2656 Driver Joined Separate
2661 no-canonical-prefixes
2674 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2675 -o <file> Place output into <file>
2678 Common Var(profile_flag)
2679 Enable function profiling
2682 Driver Var(pass_exit_codes)
2685 Common Alias(Wpedantic)
2688 Common Var(flag_pedantic_errors)
2689 Like -pedantic but issue them as errors
2695 Driver Var(use_pipes)
2698 Driver JoinedOrMissing Var(print_file_name)
2700 print-libgcc-file-name
2703 print-multi-directory
2704 Driver Var(print_multi_directory)
2707 Driver Var(print_multi_lib)
2709 print-multi-os-directory
2710 Driver Var(print_multi_os_directory)
2713 Driver Var(print_multiarch)
2716 Driver JoinedOrMissing Var(print_prog_name)
2719 Driver Var(print_search_dirs)
2722 Driver Var(print_sysroot)
2724 print-sysroot-headers-suffix
2725 Driver Var(print_sysroot_headers_suffix)
2728 Common Var(quiet_flag) RejectDriver
2729 Do not display functions compiled or elapsed time
2747 Driver Var(report_times)
2750 Driver JoinedOrMissing
2753 Driver Joined Separate
2757 ; C option, but driver must not handle as "-u ndef".
2760 Common Driver Var(verbose_flag)
2761 Enable verbose output
2764 Common Var(version_flag) RejectDriver
2765 Display the compiler's version
2768 Common Var(inhibit_warnings)
2772 Driver Separate Var(wrapper_string)
2775 Driver Joined Separate
2778 Driver RejectNegative Negative(pie)
2779 Create a shared library
2785 Driver Separate Alias(specs=)
2798 ; Documented for Fortran, but always accepted by driver.
2805 ; Documented for Go, but always accepted by driver.
2823 Driver RejectNegative Negative(shared)
2824 Create a position independent executable
2827 Driver Joined Separate
2830 Common Report Var(flag_ipa_ra) Optimization
2831 Use caller save register across calls if possible
2833 ; This comment is to ensure we retain the blank line above.