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 ; True to warn about any objects definitions whose size is larger
71 ; than N bytes. Also want about function definitions whose returned
72 ; values are larger than N bytes, where N is 'larger_than_size'.
77 HOST_WIDE_INT larger_than_size
79 ; True to warn about any function whose frame size is larger
82 bool warn_frame_larger_than
85 HOST_WIDE_INT frame_larger_than_size
87 ; Nonzero means we should be saving declaration info into a .X file.
89 int flag_gen_aux_info = 0
91 ; Nonzero if we are compiling code for a shared library, zero for
96 ; These two are really VEC(char_p,heap) *.
99 void *flag_instrument_functions_exclude_functions
102 void *flag_instrument_functions_exclude_files
104 ; Generic structs (e.g. templates not explicitly specialized)
105 ; may not have a compilation unit associated with them, and so
106 ; may need to be treated differently from ordinary structs.
108 ; Structs only handled by reference (indirectly), will also usually
109 ; not need as much debugging information.
112 enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
115 enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
117 ; True if we should exit after parsing options.
119 bool exit_after_options
121 ; Type(s) of debugging information we are producing (if any). See
122 ; flag-types.h for the definitions of the different possible types of
123 ; debugging information.
125 enum debug_info_type write_symbols = NO_DEBUG
127 ; Level of debugging information we are producing. See flag-types.h
128 ; for the definitions of the different possible levels.
130 enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
132 ; Nonzero means use GNU-only extensions in the generated symbolic
133 ; debugging information. Currently, this only has an effect when
134 ; write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG.
136 bool use_gnu_debug_info_extensions
138 ; Original value of maximum field alignment in bytes, specified via
139 ; -fpack-struct=<value>.
141 unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
143 ; Type of stack check.
145 enum stack_check_type flag_stack_check = NO_STACK_CHECK
147 ; True if stack usage information needs to be computed.
149 bool flag_stack_usage_info = false
151 ; -dA causes debug commentary information to be produced in
152 ; the generated assembly code (to make it more readable). This option
153 ; is generally only of use to those who actually need to read the
154 ; generated assembly code (perhaps while debugging the compiler itself).
155 ; Currently, this switch is only used by dwarf2out.c; however, it is intended
156 ; to be a catchall for printing debug information in the assembler file.
160 ; -dP causes the rtl to be emitted as a comment in assembly.
162 int flag_dump_rtl_in_asm
164 ; Whether -da was passed (used only in handle_common_deferred_options).
166 bool flag_dump_all_passed
168 ; Other flags saying which kinds of debugging dump have been requested.
171 int rtl_dump_and_exit
174 int flag_print_asm_name
176 ; Name of top-level original source file (what was input to cpp).
177 ; This comes from the #-command at the beginning of the actual input.
178 ; If there isn't any there, then this is the cc1 input file name.
180 const char *main_input_filename
182 ; Pointer to base name in main_input_filename, with directories and a
183 ; single final extension removed, and the length of this base
187 const char *main_input_basename
190 int main_input_baselength
192 ; Which options have been printed by --help.
196 ; Which enums have been printed by --help. 0 = not printed, no
197 ; relevant options seen, 1 = relevant option seen, not yet printed, 2
200 char *help_enum_printed
202 ; The number of columns for --help output.
204 unsigned int help_columns
206 ; Whether this options structure has been through finish_options
208 bool flag_opts_finished
210 ; What the sanitizer should instrument
212 unsigned int flag_sanitize
214 ; What sanitizers should recover from errors
216 unsigned int flag_sanitize_recover = SANITIZE_UNDEFINED | SANITIZE_NONDEFAULT | SANITIZE_KERNEL_ADDRESS
218 ; Flag whether a prefix has been added to dump_base_name
220 bool dump_base_name_prefixed = false
232 Driver Alias(coverage)
238 Common Separate Alias(d)
241 Common Joined Alias(d)
244 Common Separate Alias(dumpbase)
247 Common Separate Alias(dumpdir)
250 Driver Separate Alias(e)
253 Driver Joined Alias(e)
256 Common Warning Alias(Wextra)
259 Driver Separate Alias(Xassembler)
262 Driver JoinedOrMissing Alias(Xassembler)
265 Driver Separate Alias(Xlinker)
268 Driver JoinedOrMissing Alias(Xlinker)
271 Driver Separate Alias(u)
274 Driver Joined Alias(u)
277 Common Driver Var(help_flag)
278 Display this information
281 Common Driver Report Joined
282 --help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params
285 Driver Separate Alias(x)
288 Driver Joined Alias(x)
291 Driver Separate Alias(L)
294 Driver Joined Alias(L)
296 -no-canonical-prefixes
297 Driver Alias(no-canonical-prefixes)
299 -no-standard-libraries
300 Driver Alias(nostdlib)
303 Driver Var(no_sysroot_suffix)
312 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
315 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
318 Driver Alias(pass-exit-codes)
321 Common Alias(Wpedantic)
324 Common Alias(pedantic-errors)
333 Driver Separate Alias(B)
336 Driver JoinedOrMissing Alias(B)
342 Driver Separate Alias(print-file-name=)
345 Driver JoinedOrMissing Alias(print-file-name=)
347 -print-libgcc-file-name
348 Driver Alias(print-libgcc-file-name)
350 -print-multi-directory
351 Driver Alias(print-multi-directory)
354 Driver Alias(print-multi-lib)
356 -print-multi-os-directory
357 Driver Alias(print-multi-os-directory)
360 Driver Alias(print-multiarch)
363 Driver Separate Alias(print-prog-name=)
366 Driver JoinedOrMissing Alias(print-prog-name=)
369 Driver Alias(print-search-dirs)
372 Driver Alias(print-sysroot)
374 -print-sysroot-headers-suffix
375 Driver Alias(print-sysroot-headers-suffix)
381 Driver Alias(save-temps)
387 Driver Separate Alias(specs=)
390 Driver Joined Alias(specs=)
396 Driver Alias(symbolic)
400 Alias for --help=target
408 ;; The driver used to convert options such as --help into forms such
409 ;; as -fhelp; the following four entries are for compatibility with
410 ;; any direct uses of those (undocumented) -f forms
412 Common Driver Alias(-help)
415 Common Driver Joined Alias(-help=)
418 Common Driver Alias(-target-help)
421 Common Driver Alias(-version)
425 --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
428 Common Joined Alias(-param)
431 Driver Separate Alias(-sysroot=)
434 Driver JoinedOrMissing
440 Driver Joined Separate
446 Driver Joined Separate
452 Common JoinedOrMissing Optimization
453 -O<number> Set optimization level to <number>
457 Optimize for space rather than speed
461 Optimize for speed disregarding exact standards compliance
465 Optimize for debugging experience rather than speed or size
477 Driver Joined Separate
483 Driver Joined Separate
504 Common RejectNegative Warning Alias(Wextra)
505 This switch is deprecated; use -Wextra instead
508 Driver JoinedOrMissing
511 Driver JoinedOrMissing
514 Driver JoinedOrMissing
517 Common Var(warn_aggregate_return) Warning
518 Warn about returning structures, unions or arrays
520 Waggressive-loop-optimizations
521 Common Var(warn_aggressive_loop_optimizations) Init(1) Warning
522 Warn if a loop with constant number of iterations triggers undefined behavior
525 Common Var(warn_array_bounds) Warning
526 Warn if an array is accessed out of bounds
529 Common Var(warn_attributes) Init(1) Warning
530 Warn about inappropriate attribute usage
533 Common Var(warn_cast_align) Warning
534 Warn about pointer casts which increase alignment
537 Common Var(warn_cpp) Init(1) Warning
538 Warn when a #warning directive is encountered
540 Wdeprecated-declarations
541 Common Var(warn_deprecated_decl) Init(1) Warning
542 Warn about uses of __attribute__((deprecated)) declarations
544 Wdisabled-optimization
545 Common Var(warn_disabled_optimization) Warning
546 Warn when an optimization pass is disabled
549 Common Var(warnings_are_errors)
550 Treat all warnings as errors
554 Treat specified warning as error
557 Common Var(extra_warnings) Warning
558 Print extra (possibly unwanted) warnings
561 Common Var(flag_fatal_errors)
562 Exit on the first error occurred
565 Common RejectNegative Joined UInteger
566 -Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
569 Common Var(warn_free_nonheap_object) Init(1) Warning
570 Warn when attempting to free a non-heap object
573 Common Var(warn_inline) Warning
574 Warn when an inlined function cannot be inlined
576 Winvalid-memory-model
577 Common Var(warn_invalid_memory_model) Init(1) Warning
578 Warn when an atomic memory model parameter is known to be outside the valid range.
581 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
584 Common RejectNegative Joined UInteger Warning
585 -Wlarger-than=<number> Warn if an object is larger than <number> bytes
587 Wunsafe-loop-optimizations
588 Common Var(warn_unsafe_loop_optimizations) Warning
589 Warn if the loop cannot be optimized due to nontrivial assumptions.
592 Common Alias(Wsuggest-attribute=noreturn)
595 Common Var(warn_odr_violations) Init(1) Warning
596 Warn about some C++ One Definition Rule violations during link time optimization
599 Common Var(warn_overflow) Init(1) Warning
600 Warn about overflow in arithmetic expressions
603 Common Var(warn_packed) Warning
604 Warn when the packed attribute has no effect on struct layout
607 Common Var(warn_padded) Warning
608 Warn when padding is required to align structure members
611 Common Var(pedantic) Init(0) Warning
612 Issue warnings needed for strict compliance to the standard
615 Common Var(warn_return_local_addr) Init(1) Warning
616 Warn about returning a pointer/reference to a local or temporary variable.
619 Common Var(warn_shadow) Warning
620 Warn when one local variable shadows another
623 Common Var(warn_stack_protect) Warning
624 Warn when not issuing stack smashing protection for some reason
627 Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
628 Warn if stack usage might be larger than specified amount
632 Warn about code which might break strict aliasing rules
635 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
636 Warn about code which might break strict aliasing rules
640 Warn about optimizations that assume that signed overflow is undefined
643 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
644 Warn about optimizations that assume that signed overflow is undefined
646 Wsuggest-attribute=const
647 Common Var(warn_suggest_attribute_const) Warning
648 Warn about functions which might be candidates for __attribute__((const))
650 Wsuggest-attribute=pure
651 Common Var(warn_suggest_attribute_pure) Warning
652 Warn about functions which might be candidates for __attribute__((pure))
654 Wsuggest-attribute=noreturn
655 Common Var(warn_suggest_attribute_noreturn) Warning
656 Warn about functions which might be candidates for __attribute__((noreturn))
659 Common Var(warn_suggest_final_types) Warning
660 Warn about C++ polymorphic types where adding final keyword would improve code quality
662 Wsuggest-final-methods
663 Common Var(warn_suggest_final_methods) Warning
664 Warn about C++ virtual methods where adding final keyword would improve code quality
667 Common Var(warn_system_headers) Warning
668 Do not suppress warnings from system headers
671 Common Var(warn_trampolines) Warning
672 Warn whenever a trampoline is generated
675 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
676 Warn if a comparison is always true or always false due to the limited range of the data type
679 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
680 Warn about uninitialized automatic variables
683 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
684 Warn about maybe uninitialized automatic variables
688 Does nothing. Preserved for backward compatibility.
691 Common Var(warn_unused) Init(0) Warning
692 Enable all -Wunused- warnings
694 Wunused-but-set-parameter
695 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
696 Warn when a function parameter is only set, otherwise unused
698 Wunused-but-set-variable
699 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
700 Warn when a variable is only set, otherwise unused
703 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
704 Warn when a function is unused
707 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
708 Warn when a label is unused
711 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
712 Warn when a function parameter is unused
715 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
716 Warn when an expression value is unused
719 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
720 Warn when a variable is unused
723 Common Var(warn_coverage_mismatch) Init(1) Warning
724 Warn in case profiles in -fprofile-use do not match
726 Wvector-operation-performance
727 Common Var(warn_vector_operation_performance) Warning
728 Warn when a vector operation is compiled outside the SIMD
743 Common Separate Var(aux_info_file_name)
744 -aux-info <file> Emit declaration information into <file>
747 Common Joined Alias(aux-info)
750 Common Separate RejectDriver Var(aux_base_name)
753 Common Separate RejectDriver
763 -d<letters> Enable dumps from specific passes of the compiler
766 Common Separate Var(dump_base_name)
767 -dumpbase <file> Set the file basename to be used for dumps
770 Common Separate Var(dump_dir_name)
771 -dumpdir <dir> Set the directory name to be used for dumps
783 Driver Joined Separate
785 ; This option has historically been passed down to the linker by an
786 ; accident of a %{e*} spec, so ensure it continues to be passed down
787 ; as a single option. The supported option for this purpose is
788 ; -rdynamic. See PR 47390.
792 ; The version of the C++ ABI in use. The following values are allowed:
794 ; 0: The version of the ABI believed most conformant with the C++ ABI
795 ; specification. This ABI may change as bugs are discovered and fixed.
796 ; Therefore, 0 will not necessarily indicate the same ABI in different
799 ; 1: The version of the ABI first used in G++ 3.2. No longer selectable.
801 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
803 ; 3: The version of the ABI that fixes the missing underscore
804 ; in template non-type arguments of pointer type.
806 ; 4: The version of the ABI that introduces unambiguous mangling of
807 ; vector types. First selectable in G++ 4.5.
809 ; 5: The version of the ABI that ignores attribute const/noreturn
810 ; in function pointer mangling, and corrects mangling of decltype and
811 ; function parameters used in other parameters and the return type.
812 ; First selectable in G++ 4.6.
814 ; 6: The version of the ABI that doesn't promote scoped enums to int and
815 ; changes the mangling of template argument packs, const/static_cast,
816 ; prefix ++ and --, and a class scope function used as a template
818 ; First selectable in G++ 4.7.
820 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
821 ; corrects the mangling of lambdas in default argument scope.
822 ; First selectable in G++ 4.8.
824 ; 8: The version of the ABI that corrects the substitution behavior of
825 ; function types with function-cv-qualifiers.
826 ; First selectable in G++ 4.9.
828 ; Additional positive integers will be assigned as new versions of
829 ; the ABI become the default version of the ABI.
831 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(0)
832 The version of the C++ ABI in use
834 faggressive-loop-optimizations
835 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
836 Aggressively optimize loops using language constraints
839 Common Report Var(align_functions,0) Optimization UInteger
840 Align the start of functions
843 Common RejectNegative Joined UInteger Var(align_functions)
846 Common Report Var(align_jumps,0) Optimization UInteger
847 Align labels which are only reached by jumping
850 Common RejectNegative Joined UInteger Var(align_jumps)
853 Common Report Var(align_labels,0) Optimization UInteger
857 Common RejectNegative Joined UInteger Var(align_labels)
860 Common Report Var(align_loops,0) Optimization UInteger
861 Align the start of loops
864 Common RejectNegative Joined UInteger Var(align_loops)
868 Does nothing. Preserved for backward compatibility.
872 Does nothing. Preserved for backward compatibility.
874 fargument-noalias-global
876 Does nothing. Preserved for backward compatibility.
878 fargument-noalias-anything
880 Does nothing. Preserved for backward compatibility.
883 Common Driver Report Joined
884 Select what to sanitize
887 Common Joined RejectNegative Var(common_deferred_options) Defer
888 -fasan-shadow-offset=<number> Use custom shadow memory offset.
892 After diagnosing undefined behavior attempt to continue execution
896 This switch is deprecated; use -fsanitize-recover= instead
898 fsanitize-undefined-trap-on-error
899 Common Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
900 Use trap instead of a library function for undefined behavior sanitization
902 fasynchronous-unwind-tables
903 Common Report Var(flag_asynchronous_unwind_tables) Optimization
904 Generate unwind tables that are exact at each instruction boundary
907 Common Report Var(flag_auto_inc_dec) Init(1)
908 Generate auto-inc/dec instructions
911 Common Report Var(flag_auto_profile) Optimization
912 Use sample profile information for call graph node weights. The default
913 profile file is fbdata.afdo in 'pwd'.
916 Common Joined RejectNegative Var(auto_profile_file)
917 Use sample profile information for call graph node weights. The profile
918 file is specified in the argument.
920 ; -fcheck-bounds causes gcc to generate array bounds checks.
921 ; For C, C++ and ObjC: defaults off.
922 ; For Java: defaults to on.
923 ; For Fortran: defaults to off.
925 Common Report Var(flag_bounds_check)
926 Generate code to check bounds before indexing arrays
929 Common Report Var(flag_branch_on_count_reg) Optimization
930 Replace add, compare, branch with branch on count register
932 fbranch-probabilities
933 Common Report Var(flag_branch_probabilities) Optimization
934 Use profiling information for branch probabilities
936 fbranch-target-load-optimize
937 Common Report Var(flag_branch_target_load_optimize) Optimization
938 Perform branch target load optimization before prologue / epilogue threading
940 fbranch-target-load-optimize2
941 Common Report Var(flag_branch_target_load_optimize2) Optimization
942 Perform branch target load optimization after prologue / epilogue threading
945 Common Report Var(flag_btr_bb_exclusive) Optimization
946 Restrict target load migration not to re-use registers in any basic block
949 Common Joined RejectNegative Var(common_deferred_options) Defer
950 -fcall-saved-<register> Mark <register> as being preserved across functions
953 Common Joined RejectNegative Var(common_deferred_options) Defer
954 -fcall-used-<register> Mark <register> as being corrupted by function calls
956 ; Nonzero for -fcaller-saves: allocate values in regs that need to
957 ; be saved across function calls, if that produces overall better code.
958 ; Optional now, so people can test it.
960 Common Report Var(flag_caller_saves) Optimization
961 Save registers around function calls
964 Common Report Var(flag_check_data_deps)
965 Compare the results of several data dependence analyzers.
968 Common Var(flag_check_new)
969 Check the return value of new in C++
971 fcombine-stack-adjustments
972 Common Report Var(flag_combine_stack_adjustments) Optimization
973 Looks for opportunities to reduce stack adjustments and stack references.
976 Common Report Var(flag_no_common,0) Optimization
977 Do not put uninitialized globals in the common section
981 ; Converted by the driver to -fcompare-debug= options.
984 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
985 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
987 fcompare-debug-second
988 Common Driver RejectNegative Var(flag_compare_debug)
989 Run only the second compilation of -fcompare-debug
992 Common Report Var(flag_compare_elim_after_reload) Optimization
993 Perform comparison elimination after register allocation has finished
996 Common Var(flag_conserve_stack) Optimization
997 Do not perform optimizations increasing noticeably stack usage
1000 Common Report Var(flag_cprop_registers) Optimization
1001 Perform a register copy-propagation optimization pass
1004 Common Report Var(flag_crossjumping) Optimization
1005 Perform cross-jumping optimization
1008 Common Report Var(flag_cse_follow_jumps) Optimization
1009 When running CSE, follow jumps to their targets
1013 Does nothing. Preserved for backward compatibility.
1016 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
1017 Omit range reduction step when performing complex division
1020 Common Report Var(flag_cx_fortran_rules) Optimization
1021 Complex multiplication and division follow Fortran rules
1024 Common Report Var(flag_data_sections) Optimization
1025 Place data items into their own section
1028 Common Report Var(common_deferred_options) Defer
1029 List all available debugging counters with their limits and counts.
1032 Common RejectNegative Joined Var(common_deferred_options) Defer
1033 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
1036 Common Joined RejectNegative Var(common_deferred_options) Defer
1037 Map one directory name to another in debug information
1039 fdebug-types-section
1040 Common Report Var(flag_debug_types_section) Init(0)
1041 Output .debug_types section when using DWARF v4 debuginfo.
1043 ; Nonzero for -fdefer-pop: don't pop args after each function call
1044 ; instead save them up to pop many calls' args with one insns.
1046 Common Report Var(flag_defer_pop) Optimization
1047 Defer popping functions args from stack until later
1050 Common Report Var(flag_delayed_branch) Optimization
1051 Attempt to fill delay slots of branch instructions
1053 fdelete-dead-exceptions
1054 Common Report Var(flag_delete_dead_exceptions) Init(0)
1055 Delete dead instructions that may throw exceptions
1057 fdelete-null-pointer-checks
1058 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
1059 Delete useless null pointer checks
1061 fdevirtualize-speculatively
1062 Common Report Var(flag_devirtualize_speculatively) Optimization
1063 Perform speculative devirtualization
1066 Common Report Var(flag_devirtualize) Optimization
1067 Try to convert virtual calls to direct ones.
1069 fdiagnostics-show-location=
1070 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1071 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
1073 ; Required for these enum values.
1078 Name(diagnostic_prefixing_rule) Type(int)
1081 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1084 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1086 fdiagnostics-show-caret
1087 Common Var(flag_diagnostics_show_caret) Init(1)
1088 Show the source line with a caret indicating the column
1091 Common Alias(fdiagnostics-color=,always,never)
1095 Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1096 -fdiagnostics-color=[never|always|auto] Colorize diagnostics
1098 ; Required for these enum values.
1103 Name(diagnostic_color_rule) Type(int)
1106 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1109 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1112 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1114 fdiagnostics-show-option
1115 Common Var(flag_diagnostics_show_option) Init(1)
1116 Amend appropriate diagnostic messages with the command line option that controls them
1119 Common Joined RejectNegative Var(common_deferred_options) Defer
1120 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1123 Common Joined RejectNegative Var(common_deferred_options) Defer
1124 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1127 Common Joined RejectNegative Var(common_deferred_options) Defer
1128 -fdump-<type> Dump various compiler internals to a file
1131 Driver RejectNegative
1134 Common RejectNegative Joined Var(flag_dump_final_insns)
1135 -fdump-final-insns=filename Dump to filename the insns at the end of translation
1138 Common RejectNegative Joined Var(flag_dump_go_spec)
1139 -fdump-go-spec=filename Write all declarations to file as Go code
1142 Common Report Var(flag_dump_noaddr)
1143 Suppress output of addresses in debugging dumps
1146 Common Driver Var(flag_report_bug)
1147 Collect and dump debug information into temporary file if ICE in C/C++
1151 Common Var(flag_dump_passes) Init(0)
1152 Dump optimization passes
1155 Common Report Var(flag_dump_unnumbered)
1156 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1158 fdump-unnumbered-links
1159 Common Report Var(flag_dump_unnumbered_links)
1160 Suppress output of previous and next insn numbers in debugging dumps
1163 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1164 Enable CFI tables via GAS assembler directives.
1167 Common Report Var(flag_early_inlining) Init(1) Optimization
1168 Perform early inlining
1170 feliminate-dwarf2-dups
1171 Common Report Var(flag_eliminate_dwarf2_dups)
1172 Perform DWARF2 duplicate elimination
1175 Common Report Var(flag_ipa_sra) Init(0) Optimization
1176 Perform interprocedural reduction of aggregates
1178 feliminate-unused-debug-symbols
1179 Common Report Var(flag_debug_only_used_symbols)
1180 Perform unused type elimination in debug info
1182 feliminate-unused-debug-types
1183 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1184 Perform unused type elimination in debug info
1186 femit-class-debug-always
1187 Common Report Var(flag_emit_class_debug_always) Init(0)
1188 Do not suppress C++ class debug information.
1191 Common Report Var(flag_exceptions) Optimization
1192 Enable exception handling
1194 fexpensive-optimizations
1195 Common Report Var(flag_expensive_optimizations) Optimization
1196 Perform a number of minor, expensive optimizations
1199 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1200 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1203 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1206 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1209 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1215 Common Var(flag_fat_lto_objects)
1216 Output lto objects containing both the intermediate language and binary output.
1219 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1220 Assume no NaNs or infinities are generated
1223 Common Joined RejectNegative Var(common_deferred_options) Defer
1224 -ffixed-<register> Mark <register> as being unavailable to the compiler
1227 Common Report Var(flag_float_store) Optimization
1228 Don't allocate floats and doubles in extended-precision registers
1232 Does nothing. Preserved for backward compatibility.
1235 Common Report Var(flag_forward_propagate) Optimization
1236 Perform a forward propagation pass on RTL
1239 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1240 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1243 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1246 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1248 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1250 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1253 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1255 ; Nonzero means don't put addresses of constant functions in registers.
1256 ; Used for compiling the Unix kernel, where strange substitutions are
1257 ; done on the assembly output.
1259 Common Report Var(flag_no_function_cse,0)
1260 Allow function addresses to be held in registers
1263 Common Report Var(flag_function_sections)
1264 Place each function into its own section
1267 Common Report Var(flag_gcse) Optimization
1268 Perform global common subexpression elimination
1271 Common Report Var(flag_gcse_lm) Init(1) Optimization
1272 Perform enhanced load motion during global common subexpression elimination
1275 Common Report Var(flag_gcse_sm) Init(0) Optimization
1276 Perform store motion after global common subexpression elimination
1279 Common Report Var(flag_gcse_las) Init(0) Optimization
1280 Perform redundant load after store elimination in global common subexpression
1284 Common Report Var(flag_gcse_after_reload) Optimization
1285 Perform global common subexpression elimination after register allocation
1288 ; This option is not documented yet as its semantics will change.
1290 Common Report Var(flag_graphite)
1291 Enable in and out of Graphite representation
1294 Common Report Var(flag_graphite_identity) Optimization
1295 Enable Graphite Identity transformation
1297 fgraphite-code-generator=
1298 Common Report RejectNegative Joined Optimization Enum(fgraphite_generator) Var(flag_graphite_code_gen) Init(FGRAPHITE_CODE_GEN_ISL)
1299 Choose code generator of Graphite
1302 Name(fgraphite_generator) Type(enum fgraphite_generator) UnknownError(unknown code generator of graphite %qs)
1305 Enum(fgraphite_generator) String(isl) Value(FGRAPHITE_CODE_GEN_ISL)
1308 Enum(fgraphite_generator) String(cloog) Value(FGRAPHITE_CODE_GEN_CLOOG)
1310 fhoist-adjacent-loads
1311 Common Report Var(flag_hoist_adjacent_loads) Optimization
1312 Enable hoisting adjacent loads to encourage generating conditional move
1315 floop-parallelize-all
1316 Common Report Var(flag_loop_parallelize_all) Optimization
1317 Mark all loops as parallel
1320 Common Report Var(flag_loop_strip_mine) Optimization
1321 Enable Loop Strip Mining transformation
1324 Common Report Var(flag_loop_interchange) Optimization
1325 Enable Loop Interchange transformation
1328 Common Report Var(flag_loop_block) Optimization
1329 Enable Loop Blocking transformation
1332 Common Report Var(flag_tm)
1333 Enable support for GNU transactional memory
1336 Common Report Var(flag_gnu_unique) Init(1)
1337 Use STB_GNU_UNIQUE if supported by the assembler
1341 Does nothing. Preserved for backward compatibility.
1344 Common Report Var(flag_loop_optimize_isl) Optimization
1345 Enable the ISL based loop nest optimizer
1347 fstrict-volatile-bitfields
1348 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1349 Force bitfield accesses to match their type width
1351 fguess-branch-probability
1352 Common Report Var(flag_guess_branch_prob) Optimization
1353 Enable guessing of branch probabilities
1355 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1356 ; Generate position-independent code for executables if possible
1357 ; On SVR4 targets, it also controls whether or not to emit a
1358 ; string identifying the compiler.
1360 Common Report Var(flag_no_ident,0)
1361 Process #ident directives
1364 Common Report Var(flag_if_conversion) Optimization
1365 Perform conversion of conditional jumps to branchless equivalents
1368 Common Report Var(flag_if_conversion2) Optimization
1369 Perform conversion of conditional jumps to conditional execution
1372 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1373 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1376 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1379 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1382 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1385 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1387 ftree-loop-if-convert
1388 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1389 Convert conditional jumps in innermost loops to branchless equivalents
1391 ftree-loop-if-convert-stores
1392 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1393 Also if-convert conditional jumps containing memory writes
1395 ; -finhibit-size-directive inhibits output of .size for ELF.
1396 ; This is used only for compiling crtstuff.c,
1397 ; and it may be extended to other effects
1398 ; needed for crtstuff.c on other systems.
1399 finhibit-size-directive
1400 Common Report Var(flag_inhibit_size_directive)
1401 Do not generate .size directives
1404 Common Report Var(flag_indirect_inlining)
1405 Perform indirect inlining
1407 ; General flag to enable inlining. Specifying -fno-inline will disable
1408 ; all inlining apart from always-inline functions.
1410 Common Report Var(flag_no_inline,0) Init(0) Optimization
1411 Enable inlining of function declared \"inline\", disabling disables all inlining
1413 finline-small-functions
1414 Common Report Var(flag_inline_small_functions) Optimization
1415 Integrate functions into their callers when code size is known not to grow
1418 Common Report Var(flag_inline_functions) Optimization
1419 Integrate functions not declared \"inline\" into their callers when profitable
1421 finline-functions-called-once
1422 Common Report Var(flag_inline_functions_called_once) Optimization
1423 Integrate functions only required by their single caller
1426 Common RejectNegative Joined Alias(finline-limit=)
1429 Common RejectNegative Joined UInteger
1430 -finline-limit=<number> Limit the size of inlined functions to <number>
1433 Common Report Var(flag_inline_atomics) Init(1) Optimization
1434 Inline __atomic operations when a lock free instruction sequence is available.
1436 finstrument-functions
1437 Common Report Var(flag_instrument_function_entry_exit)
1438 Instrument function entry and exit with profiling calls
1440 finstrument-functions-exclude-function-list=
1441 Common RejectNegative Joined
1442 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1444 finstrument-functions-exclude-file-list=
1445 Common RejectNegative Joined
1446 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1449 Common Report Var(flag_ipa_cp) Optimization
1450 Perform interprocedural constant propagation
1453 Common Report Var(flag_ipa_cp_clone) Optimization
1454 Perform cloning to make Interprocedural constant propagation stronger
1457 Common Report Var(flag_ipa_profile) Init(0) Optimization
1458 Perform interprocedural profile propagation
1461 Common Report Var(flag_ipa_pta) Init(0) Optimization
1462 Perform interprocedural points-to analysis
1465 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1466 Discover pure and const functions
1469 Common Report Var(flag_ipa_icf) Optimization
1470 Perform Identical Code Folding for functions and read-only variables
1473 Common Report Var(flag_ipa_icf_functions) Optimization
1474 Perform Identical Code Folding for functions
1477 Common Report Var(flag_ipa_icf_variables) Optimization
1478 Perform Identical Code Folding for variables
1481 Common Report Var(flag_ipa_reference) Init(0) Optimization
1482 Discover readonly and non addressable static variables
1486 Does nothing. Preserved for backward compatibility.
1490 Does nothing. Preserved for backward compatibility.
1493 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1494 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1497 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1500 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1503 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1506 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1507 -fira-region=[one|all|mixed] Set regions for IRA
1510 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1513 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1516 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1519 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1522 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1523 Use IRA based register pressure calculation
1524 in RTL hoist optimizations.
1527 Common Report Var(flag_ira_loop_pressure) Optimization
1528 Use IRA based register pressure calculation
1529 in RTL loop optimizations.
1531 fira-share-save-slots
1532 Common Report Var(flag_ira_share_save_slots) Init(1)
1533 Share slots for saving different hard registers.
1535 fira-share-spill-slots
1536 Common Report Var(flag_ira_share_spill_slots) Init(1)
1537 Share stack slots for spilled pseudo-registers.
1540 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1541 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1544 Common Report Var(flag_ivopts) Init(1) Optimization
1545 Optimize induction variables on trees
1548 Common Var(flag_jump_tables) Init(1) Optimization
1549 Use jump tables for sufficiently large switch statements
1551 fkeep-inline-functions
1552 Common Report Var(flag_keep_inline_functions)
1553 Generate code for functions even if they are fully inlined
1556 Common Report Var(flag_keep_static_consts) Init(1)
1557 Emit static const variables even if they are not used
1560 Common Report Var(flag_leading_underscore) Init(-1)
1561 Give external symbols a leading underscore
1565 Does nothing. Preserved for backward compatibility.
1569 Enable link-time optimization.
1572 Common RejectNegative Joined Var(flag_lto)
1573 Link-time optimization with number of parallel jobs or jobserver.
1576 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1579 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1582 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1585 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1588 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1591 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1594 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1595 Specify the algorithm to partition symbols and vars at linktime
1597 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1598 flto-compression-level=
1599 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1600 -flto-compression-level=<number> Use zlib compression level <number> for IL
1602 flto-odr-type-merging
1603 Common Report Var(flag_lto_odr_type_mering) Init(1)
1604 Merge C++ types using One Definition Rule
1607 Common Report Var(flag_lto_report) Init(0)
1608 Report various link-time optimization statistics
1611 Common Report Var(flag_lto_report_wpa) Init(0)
1612 Report various link-time optimization statistics for WPA only
1615 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1616 Set errno after built-in math functions
1619 Common Joined RejectNegative UInteger Var(flag_max_errors)
1620 -fmax-errors=<number> Maximum number of errors to report
1623 Common Report Var(mem_report)
1624 Report on permanent memory allocation
1627 Common Report Var(mem_report_wpa)
1628 Report on permanent memory allocation in WPA only
1630 ; This will attempt to merge constant section constants, if 1 only
1631 ; string constants and constants from constant pool, if 2 also constant
1633 fmerge-all-constants
1634 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1635 Attempt to merge identical constants and constant variables
1638 Common Report Var(flag_merge_constants,1) Optimization
1639 Attempt to merge identical constants across compilation units
1641 fmerge-debug-strings
1642 Common Report Var(flag_merge_debug_strings) Init(1)
1643 Attempt to merge identical debug strings across compilation units
1646 Common RejectNegative Joined UInteger
1647 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1650 Common Report Var(flag_modulo_sched) Optimization
1651 Perform SMS based modulo scheduling before the first scheduling pass
1653 fmodulo-sched-allow-regmoves
1654 Common Report Var(flag_modulo_sched_allow_regmoves)
1655 Perform SMS based modulo scheduling with register moves allowed
1657 fmove-loop-invariants
1658 Common Report Var(flag_move_loop_invariants) Optimization
1659 Move loop invariant computations out of loops
1662 Common Var(flag_dce) Init(1) Optimization
1663 Use the RTL dead code elimination pass
1666 Common Var(flag_dse) Init(1) Optimization
1667 Use the RTL dead store elimination pass
1669 freschedule-modulo-scheduled-loops
1670 Common Report Var(flag_resched_modulo_sched) Optimization
1671 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1673 fnon-call-exceptions
1674 Common Report Var(flag_non_call_exceptions) Optimization
1675 Support synchronous non-call exceptions
1678 Common Report Var(flag_omit_frame_pointer) Optimization
1679 When possible do not generate stack frames
1682 Common Report Var(flag_opt_info) Optimization
1683 Enable all optimization info dumps on stderr
1686 Common Joined RejectNegative Var(common_deferred_options) Defer
1687 -fopt-info[-<type>=filename] Dump compiler optimization details
1689 foptimize-register-move
1691 Does nothing. Preserved for backward compatibility.
1693 foptimize-sibling-calls
1694 Common Report Var(flag_optimize_sibling_calls) Optimization
1695 Optimize sibling and tail recursive calls
1698 Common Report Var(flag_partial_inlining)
1699 Perform partial inlining
1702 Common Report Var(pre_ipa_mem_report)
1703 Report on memory allocation before interprocedural optimization
1705 fpost-ipa-mem-report
1706 Common Report Var(post_ipa_mem_report)
1707 Report on memory allocation before interprocedural optimization
1710 Common Report Var(flag_pack_struct) Optimization
1711 Pack structure members together without holes
1714 Common RejectNegative Joined UInteger Optimization
1715 -fpack-struct=<number> Set initial maximum structure member alignment
1718 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1719 Return small aggregates in memory, not registers
1722 Common Report Var(flag_peel_loops) Optimization
1723 Perform loop peeling
1726 Common Report Var(flag_no_peephole,0) Optimization
1727 Enable machine specific peephole optimizations
1730 Common Report Var(flag_peephole2) Optimization
1731 Enable an RTL peephole pass before sched2
1734 Common Report Var(flag_pic,2) Negative(fPIE)
1735 Generate position-independent code if possible (large mode)
1738 Common Report Var(flag_pie,2) Negative(fpic)
1739 Generate position-independent code for executables if possible (large mode)
1742 Common Report Var(flag_pic,1) Negative(fpie)
1743 Generate position-independent code if possible (small mode)
1746 Common Report Var(flag_pie,1) Negative(fPIC)
1747 Generate position-independent code for executables if possible (small mode)
1750 Common Joined RejectNegative Var(common_deferred_options) Defer
1751 Specify a plugin to load
1754 Common Joined RejectNegative Var(common_deferred_options) Defer
1755 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1757 fpredictive-commoning
1758 Common Report Var(flag_predictive_commoning) Optimization
1759 Run predictive commoning optimization.
1761 fprefetch-loop-arrays
1762 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1763 Generate prefetch instructions, if available, for arrays in loops
1766 Common Report Var(profile_flag)
1767 Enable basic program profiling code
1770 Common Report Var(profile_arc_flag)
1771 Insert arc-based program profiling code
1774 Common Joined RejectNegative Var(profile_data_prefix)
1775 Set the top-level directory for storing the profile data.
1776 The default is 'pwd'.
1779 Common Report Var(flag_profile_correction)
1780 Enable correction of flow inconsistent profile data input
1784 Enable common options for generating profile info for profile feedback directed optimizations
1787 Common Joined RejectNegative
1788 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1791 Common Var(flag_profile_use)
1792 Enable common options for performing profile feedback directed optimizations
1795 Common Joined RejectNegative
1796 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1799 Common Report Var(flag_profile_values)
1800 Insert code to profile values of expressions
1803 Common Report Var(profile_report)
1804 Report on consistency of profile
1806 fprofile-reorder-functions
1807 Common Report Var(flag_profile_reorder_functions)
1808 Enable function reordering that improves code placement
1811 Common Var(common_deferred_options) Defer
1814 Common Joined RejectNegative Var(common_deferred_options) Defer
1815 -frandom-seed=<number> Make compile reproducible using <number>
1817 ; This switch causes the command line that was used to create an
1818 ; object file to be recorded into the object file. The exact format
1819 ; of this recording is target and binary file format dependent.
1820 ; It is related to the -fverbose-asm switch, but that switch only
1821 ; records information in the assembler output file as comments, so
1822 ; they never reach the object file.
1823 frecord-gcc-switches
1824 Common Report Var(flag_record_gcc_switches)
1825 Record gcc command line switches in the object file.
1828 Common Report Var(flag_pcc_struct_return,0) Optimization
1829 Return small aggregates in registers
1833 Does nothing. Preserved for backward compatibility.
1835 flive-range-shrinkage
1836 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
1837 Relief of register pressure through live range shrinkage
1840 Common Report Var(flag_rename_registers) Init(2) Optimization
1841 Perform a register renaming optimization pass
1844 Common Report Var(flag_reorder_blocks) Optimization
1845 Reorder basic blocks to improve code placement
1847 freorder-blocks-and-partition
1848 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1849 Reorder basic blocks and partition into hot and cold sections
1852 Common Report Var(flag_reorder_functions) Optimization
1853 Reorder functions to improve code placement
1855 frerun-cse-after-loop
1856 Common Report Var(flag_rerun_cse_after_loop) Optimization
1857 Add a common subexpression elimination pass after loop optimizations
1861 Does nothing. Preserved for backward compatibility.
1864 Common Report Var(flag_rounding_math) Optimization SetByCombined
1865 Disable optimizations that assume default FP rounding behavior
1868 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1869 Enable scheduling across basic blocks
1872 Common Report Var(flag_sched_pressure) Init(0) Optimization
1873 Enable register pressure sensitive insn scheduling
1876 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1877 Allow speculative motion of non-loads
1880 Common Report Var(flag_schedule_speculative_load) Optimization
1881 Allow speculative motion of some loads
1883 fsched-spec-load-dangerous
1884 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1885 Allow speculative motion of more loads
1888 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1889 -fsched-verbose=<number> Set the verbosity level of the scheduler
1891 fsched2-use-superblocks
1892 Common Report Var(flag_sched2_use_superblocks) Optimization
1893 If scheduling post reload, do superblock scheduling
1897 Does nothing. Preserved for backward compatibility.
1900 Common Report Var(flag_schedule_insns) Optimization
1901 Reschedule instructions before register allocation
1904 Common Report Var(flag_schedule_insns_after_reload) Optimization
1905 Reschedule instructions after register allocation
1907 ; This flag should be on when a target implements non-trivial
1908 ; scheduling hooks, maybe saving some information for its own sake.
1909 ; On IA64, for example, this is used for correct bundling.
1910 fselective-scheduling
1911 Common Report Var(flag_selective_scheduling) Optimization
1912 Schedule instructions using selective scheduling algorithm
1914 fselective-scheduling2
1915 Common Report Var(flag_selective_scheduling2) Optimization
1916 Run selective scheduling after reload
1918 fsel-sched-pipelining
1919 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1920 Perform software pipelining of inner loops during selective scheduling
1922 fsel-sched-pipelining-outer-loops
1923 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1924 Perform software pipelining of outer loops during selective scheduling
1926 fsel-sched-reschedule-pipelined
1927 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1928 Reschedule pipelined regions without pipelining
1930 fsemantic-interposition
1931 Common Report Var(flag_semantic_interposition) Init(1)
1932 Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker
1934 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1935 ; of stalled insns into the ready list.
1936 fsched-stalled-insns
1937 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1938 Allow premature scheduling of queued insns
1940 fsched-stalled-insns=
1941 Common RejectNegative Joined UInteger
1942 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1944 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1945 ; be examined for a dependency on a stalled insn that is candidate for
1946 ; premature removal from the queue of stalled insns into the ready list (has
1947 ; an effect only if the flag 'sched_stalled_insns' is set).
1948 fsched-stalled-insns-dep
1949 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1950 Set dependence distance checking in premature scheduling of queued insns
1952 fsched-stalled-insns-dep=
1953 Common RejectNegative Joined UInteger
1954 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1956 fsched-group-heuristic
1957 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1958 Enable the group heuristic in the scheduler
1960 fsched-critical-path-heuristic
1961 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1962 Enable the critical path heuristic in the scheduler
1964 fsched-spec-insn-heuristic
1965 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1966 Enable the speculative instruction heuristic in the scheduler
1968 fsched-rank-heuristic
1969 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1970 Enable the rank heuristic in the scheduler
1972 fsched-last-insn-heuristic
1973 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1974 Enable the last instruction heuristic in the scheduler
1976 fsched-dep-count-heuristic
1977 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1978 Enable the dependent count heuristic in the scheduler
1981 Common Report Var(flag_section_anchors) Optimization
1982 Access data in the same section from shared anchor points
1986 Does nothing. Preserved for backward compatibility.
1990 Does nothing. Preserved for backward compatibility.
1993 Common Report Var(flag_ree) Init(0)
1994 Turn on Redundant Extensions Elimination pass.
1997 Common Report Var(flag_show_column) Init(1)
1998 Show column numbers in diagnostics, when available. Default on
2001 Common Report Var(flag_shrink_wrap) Optimization
2002 Emit function prologues only before parts of the function that need it,
2003 rather than at the top of the function.
2006 Common Report Var(flag_signaling_nans) Optimization SetByCombined
2007 Disable optimizations observable by IEEE signaling NaNs
2010 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
2011 Disable floating point optimizations that ignore the IEEE signedness of zero
2013 fsingle-precision-constant
2014 Common Report Var(flag_single_precision_constant) Optimization
2015 Convert floating point constants to single precision constants
2017 fsplit-ivs-in-unroller
2018 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
2019 Split lifetimes of induction variables when loops are unrolled
2022 Common Report Var(flag_split_stack) Init(-1)
2023 Generate discontiguous stack frames
2026 Common Report Var(flag_split_wide_types) Optimization
2027 Split wide types into independent registers
2030 Common Report Var(flag_ssa_phiopt) Optimization
2031 Optimize conditional patterns using SSA PHI nodes
2033 fvariable-expansion-in-unroller
2034 Common Report Var(flag_variable_expansion_in_unroller) Optimization
2035 Apply variable expansion when loops are unrolled
2038 Common Report RejectNegative Joined
2039 -fstack-check=[no|generic|specific] Insert stack checking code into the program
2042 Common Alias(fstack-check=, specific, no)
2043 Insert stack checking code into the program. Same as -fstack-check=specific
2046 Common Var(common_deferred_options) Defer
2048 fstack-limit-register=
2049 Common RejectNegative Joined Var(common_deferred_options) Defer
2050 -fstack-limit-register=<register> Trap if the stack goes past <register>
2052 fstack-limit-symbol=
2053 Common RejectNegative Joined Var(common_deferred_options) Defer
2054 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
2057 Common Report Var(flag_stack_protect, 1)
2058 Use propolice as a stack protection method
2060 fstack-protector-all
2061 Common Report RejectNegative Var(flag_stack_protect, 2)
2062 Use a stack protection method for every function
2064 fstack-protector-strong
2065 Common Report RejectNegative Var(flag_stack_protect, 3)
2066 Use a smart stack protection method for certain functions
2069 Common RejectNegative Var(flag_stack_usage)
2070 Output stack usage information on a per-function basis
2074 Does nothing. Preserved for backward compatibility.
2076 ; Nonzero if we should do (language-dependent) alias analysis.
2077 ; Typically, this analysis will assume that expressions of certain
2078 ; types do not alias expressions of certain other types. Only used
2079 ; if alias analysis (in general) is enabled.
2081 Common Report Var(flag_strict_aliasing) Optimization
2082 Assume strict aliasing rules apply
2085 Common Report Var(flag_strict_overflow)
2086 Treat signed overflow as undefined
2089 Common Report Var(flag_sync_libcalls) Init(1)
2090 Implement __atomic operations via libcalls to legacy __sync functions
2093 Common Report Var(flag_syntax_only)
2094 Check for syntax errors, then stop
2097 Common Report Var(flag_test_coverage)
2098 Create data files needed by \"gcov\"
2101 Common Report Var(flag_thread_jumps) Optimization
2102 Perform jump threading optimizations
2105 Common Report Var(time_report)
2106 Report the time taken by each compiler pass
2109 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2110 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
2113 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2116 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2119 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2122 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2125 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2128 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
2129 Reorder top level functions, variables, and asms
2132 Common Report Var(flag_tracer)
2133 Perform superblock formation via tail duplication
2135 ; Zero means that floating-point math operations cannot generate a
2136 ; (user-visible) trap. This is the case, for example, in nonstop
2137 ; IEEE 754 arithmetic.
2139 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2140 Assume floating-point operations can trap
2143 Common Report Var(flag_trapv) Optimization
2144 Trap for signed overflow in addition, subtraction and multiplication
2147 Common Report Var(flag_tree_ccp) Optimization
2148 Enable SSA-CCP optimization on trees
2151 Common Report Var(flag_tree_bit_ccp) Optimization
2152 Enable SSA-BIT-CCP optimization on trees
2156 Does nothing. Preserved for backward compatibility.
2159 Common Report Var(flag_tree_ch) Optimization
2160 Enable loop header copying on trees
2162 ftree-coalesce-inlined-vars
2163 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2164 Enable coalescing of copy-related user variables that are inlined
2167 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2168 Enable coalescing of all copy-related user variables
2171 Common Report Var(flag_tree_copyrename) Optimization
2172 Replace SSA temporaries with better names in copies
2175 Common Report Var(flag_tree_copy_prop) Optimization
2176 Enable copy propagation on trees
2178 ftree-store-copy-prop
2180 Does nothing. Preserved for backward compatibility.
2183 Common Report Var(flag_tree_cselim) Init(2) Optimization
2184 Transform condition stores into unconditional ones
2186 ftree-switch-conversion
2187 Common Report Var(flag_tree_switch_conversion) Optimization
2188 Perform conversions of switch initializations.
2191 Common Report Var(flag_tree_dce) Optimization
2192 Enable SSA dead code elimination optimization on trees
2194 ftree-dominator-opts
2195 Common Report Var(flag_tree_dom) Optimization
2196 Enable dominator optimizations
2199 Common Report Var(flag_tree_tail_merge) Optimization
2200 Enable tail merging on trees
2203 Common Report Var(flag_tree_dse) Optimization
2204 Enable dead store elimination
2207 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2208 Enable forward propagation on trees
2211 Common Report Var(flag_tree_fre) Optimization
2212 Enable Full Redundancy Elimination (FRE) on trees
2215 Common Report Var(flag_optimize_strlen) Optimization
2216 Enable string length optimizations on trees
2218 fisolate-erroneous-paths-dereference
2219 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2220 Detect paths which trigger erroneous or undefined behaviour due to
2221 dereferencing a NULL pointer. Isolate those paths from the main control
2222 flow and turn the statement with erroneous or undefined behaviour into a trap.
2224 fisolate-erroneous-paths-attribute
2225 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2226 Detect paths which trigger erroneous or undefined behaviour due a NULL value
2227 being used in a way which is forbidden by a returns_nonnull or nonnull
2228 attribute. Isolate those paths from the main control flow and turn the
2229 statement with erroneous or undefined behaviour into a trap.
2231 ftree-loop-distribution
2232 Common Report Var(flag_tree_loop_distribution) Optimization
2233 Enable loop distribution on trees
2235 ftree-loop-distribute-patterns
2236 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2237 Enable loop distribution for patterns transformed into a library call
2240 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2241 Enable loop invariant motion on trees
2244 Common Alias(floop-interchange)
2245 Enable loop interchange transforms. Same as -floop-interchange
2248 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2249 Create canonical induction variables in loops
2252 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2253 Enable loop optimizations on tree level
2255 ftree-parallelize-loops=
2256 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2257 Enable automatic parallelization of loops
2260 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2261 Enable hoisting loads from conditional pointers.
2264 Common Report Var(flag_tree_pre) Optimization
2265 Enable SSA-PRE optimization on trees
2268 Common Report Var(flag_tree_partial_pre) Optimization
2269 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2272 Common Report Var(flag_tree_pta) Optimization
2273 Perform function-local points-to analysis on trees.
2276 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2277 Enable reassociation on tree level
2281 Does nothing. Preserved for backward compatibility.
2284 Common Report Var(flag_tree_sink) Optimization
2285 Enable SSA code sinking on trees
2288 Common Report Var(flag_tree_slsr) Optimization
2289 Perform straight-line strength reduction
2292 Common Report Var(flag_tree_sra) Optimization
2293 Perform scalar replacement of aggregates
2296 Common Report Var(flag_tree_ter) Optimization
2297 Replace temporary expressions in the SSA->normal pass
2300 Common Report Var(flag_tree_live_range_split) Optimization
2301 Perform live range splitting during the SSA->normal pass
2304 Common Report Var(flag_tree_vrp) Init(0) Optimization
2305 Perform Value Range Propagation on trees
2308 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2309 Compile whole compilation unit at a time
2312 Common Report Var(flag_unroll_loops) Optimization
2313 Perform loop unrolling when iteration count is known
2316 Common Report Var(flag_unroll_all_loops) Optimization
2317 Perform loop unrolling for all loops
2319 ; Nonzero means that loop optimizer may assume that the induction variables
2320 ; that control loops do not overflow and that the loops with nontrivial
2321 ; exit condition are not infinite
2322 funsafe-loop-optimizations
2323 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2324 Allow loop optimizations to assume that the loops behave in normal way
2327 Common Report Var(flag_associative_math) SetByCombined
2328 Allow optimization for floating-point arithmetic which may change the
2329 result of the operation due to rounding.
2332 Common Report Var(flag_reciprocal_math) SetByCombined
2333 Same as -fassociative-math for expressions which include division.
2335 ; Nonzero means that unsafe floating-point math optimizations are allowed
2336 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2337 ; are allowed to assume that their arguments and results are "normal"
2338 ; (e.g., nonnegative for SQRT).
2339 funsafe-math-optimizations
2340 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2341 Allow math optimizations that may violate IEEE or ISO standards
2344 Common Report Var(flag_unswitch_loops) Optimization
2345 Perform loop unswitching
2348 Common Report Var(flag_unwind_tables) Optimization
2349 Just generate unwind tables for exception handling
2352 Common Driver Negative(fuse-ld=gold)
2353 Use the bfd linker instead of the default linker
2356 Common Driver Negative(fuse-ld=bfd)
2357 Use the gold linker instead of the default linker
2360 Common Undocumented Var(flag_use_linker_plugin)
2362 ; Positive if we should track variables, negative if we should run
2363 ; the var-tracking pass only to discard debug annotations, zero if
2364 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2365 ; will be set according to optimize, debug_info_level and debug_hooks
2366 ; in process_options ().
2368 Common Report Var(flag_var_tracking) Init(2) Optimization
2369 Perform variable tracking
2371 ; Positive if we should track variables at assignments, negative if
2372 ; we should run the var-tracking pass only to discard debug
2373 ; annotations. When flag_var_tracking_assignments ==
2374 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2375 fvar-tracking-assignments
2376 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2377 Perform variable tracking by annotating assignments
2379 ; Nonzero if we should toggle flag_var_tracking_assignments after
2380 ; processing options and computing its default. */
2381 fvar-tracking-assignments-toggle
2382 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2383 Toggle -fvar-tracking-assignments
2385 ; Positive if we should track uninitialized variables, negative if
2386 ; we should run the var-tracking pass only to discard debug
2387 ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
2388 ; will be set according to flag_var_tracking.
2389 fvar-tracking-uninit
2390 Common Report Var(flag_var_tracking_uninit) Optimization
2391 Perform variable tracking and also tag variables that are uninitialized
2394 Common Report Var(flag_tree_vectorize) Optimization
2395 Enable vectorization on trees
2397 ftree-vectorizer-verbose=
2398 Common Joined RejectNegative Ignore
2399 Does nothing. Preserved for backward compatibility.
2401 ftree-loop-vectorize
2402 Common Report Var(flag_tree_loop_vectorize) Optimization
2403 Enable loop vectorization on trees
2406 Common Report Var(flag_tree_slp_vectorize) Optimization
2407 Enable basic block vectorization (SLP) on trees
2410 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT)
2411 Specifies the cost model for vectorization
2414 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED)
2415 Specifies the vectorization cost model for code marked with a simd directive
2418 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2421 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2424 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2427 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2430 Common RejectNegative Alias(fvect-cost-model=,dynamic)
2431 Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
2434 Common RejectNegative Alias(fvect-cost-model=,unlimited)
2435 Enables the unlimited vectorizer cost model. Preserved for backward compatibility.
2437 ftree-vect-loop-version
2439 Does nothing. Preserved for backward compatibility.
2442 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2443 Enable copy propagation of scalar-evolution information.
2445 ; -fverbose-asm causes extra commentary information to be produced in
2446 ; the generated assembly code (to make it more readable). This option
2447 ; is generally only of use to those who actually need to read the
2448 ; generated assembly code (perhaps while debugging the compiler itself).
2449 ; -fno-verbose-asm, the default, causes the extra information
2450 ; to not be added and is useful when comparing two assembler files.
2452 Common Report Var(flag_verbose_asm)
2453 Add extra commentary to assembler output
2456 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2457 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2460 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2463 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2466 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2469 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2472 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2475 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2476 Validate vtable pointers before using them.
2479 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2482 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2485 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2488 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2491 Common Var(flag_vtv_counts)
2492 Output vtable verification counters.
2495 Common Var(flag_vtv_debug)
2496 Output vtable verification pointer sets information.
2499 Common Report Var(flag_value_profile_transformations) Optimization
2500 Use expression value profiles in optimizations
2503 Common Report Var(flag_web) Init(2) Optimization
2504 Construct webs and split unrelated uses of single variable
2506 ftree-builtin-call-dce
2507 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2508 Enable conditional dead code elimination for builtin calls
2511 Common Report Var(flag_whole_program) Init(0) Optimization
2512 Perform whole program optimizations
2515 Common Report Var(flag_wrapv) Optimization
2516 Assume signed arithmetic overflow wraps around
2518 fzero-initialized-in-bss
2519 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2520 Put zero initialized data in the bss section
2523 Common JoinedOrMissing
2524 Generate debug information in default format
2527 Common JoinedOrMissing Negative(gdwarf)
2528 Generate debug information in COFF format
2531 Common JoinedOrMissing Negative(gdwarf-)
2532 Generate debug information in default version of DWARF format
2535 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2536 Generate debug information in DWARF v2 (or later) format
2539 Common JoinedOrMissing
2540 Generate debug information in default extended format
2543 Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2544 Don't generate DWARF pubnames and pubtypes sections.
2547 Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2548 Generate DWARF pubnames and pubtypes sections.
2551 Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2552 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2554 gno-record-gcc-switches
2555 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2556 Don't record gcc command line switches in DWARF DW_AT_producer.
2558 grecord-gcc-switches
2559 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2560 Record gcc command line switches in DWARF DW_AT_producer.
2563 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2564 Don't generate debug information in separate .dwo files
2567 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2568 Generate debug information in separate .dwo files
2571 Common JoinedOrMissing Negative(gstabs+)
2572 Generate debug information in STABS format
2575 Common JoinedOrMissing Negative(gvms)
2576 Generate debug information in extended STABS format
2579 Common RejectNegative Var(dwarf_strict,0) Init(0)
2580 Emit DWARF additions beyond selected version
2583 Common Report RejectNegative Var(dwarf_strict,1)
2584 Don't emit DWARF additions beyond selected version
2587 Common Report Var(flag_gtoggle)
2588 Toggle debug information generation
2591 Common JoinedOrMissing Negative(gxcoff)
2592 Generate debug information in VMS format
2595 Common JoinedOrMissing Negative(gxcoff+)
2596 Generate debug information in XCOFF format
2599 Common JoinedOrMissing Negative(gcoff)
2600 Generate debug information in extended XCOFF format
2603 Name(compressed_debug_sections) Type(int)
2605 ; Since -gz= is completely handled in specs, the values aren't used and we
2606 ; assign arbitrary constants.
2608 Enum(compressed_debug_sections) String(none) Value(0)
2611 Enum(compressed_debug_sections) String(zlib) Value(1)
2614 Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
2618 Generate compressed debug sections
2621 Common Driver Joined Enum(compressed_debug_sections)
2622 -gz=<format> Generate compressed debug sections in format <format>
2625 Driver Joined Separate
2628 Common Joined Var(plugindir_string) Init(0)
2629 -iplugindir=<dir> Set <dir> to be the default plugin directory
2632 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2633 -imultiarch <dir> Set <dir> to be the multiarch include subdirectory
2636 Driver Joined Separate
2641 no-canonical-prefixes
2654 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2655 -o <file> Place output into <file>
2658 Common Var(profile_flag)
2659 Enable function profiling
2662 Driver Var(pass_exit_codes)
2665 Common Alias(Wpedantic)
2668 Common Var(flag_pedantic_errors)
2669 Like -pedantic but issue them as errors
2675 Driver Var(use_pipes)
2678 Driver JoinedOrMissing Var(print_file_name)
2680 print-libgcc-file-name
2683 print-multi-directory
2684 Driver Var(print_multi_directory)
2687 Driver Var(print_multi_lib)
2689 print-multi-os-directory
2690 Driver Var(print_multi_os_directory)
2693 Driver Var(print_multiarch)
2696 Driver JoinedOrMissing Var(print_prog_name)
2699 Driver Var(print_search_dirs)
2702 Driver Var(print_sysroot)
2704 print-sysroot-headers-suffix
2705 Driver Var(print_sysroot_headers_suffix)
2708 Common Var(quiet_flag) RejectDriver
2709 Do not display functions compiled or elapsed time
2727 Driver Var(report_times)
2730 Driver JoinedOrMissing
2733 Driver Joined Separate
2737 ; C option, but driver must not handle as "-u ndef".
2740 Common Driver Var(verbose_flag)
2741 Enable verbose output
2744 Common Var(version_flag) RejectDriver
2745 Display the compiler's version
2748 Common Var(inhibit_warnings)
2752 Driver Separate Var(wrapper_string)
2755 Driver Joined Separate
2758 Driver RejectNegative Negative(pie)
2759 Create a shared library
2765 Driver Separate Alias(specs=)
2778 ; Documented for Fortran, but always accepted by driver.
2785 ; Documented for Go, but always accepted by driver.
2803 Driver RejectNegative Negative(shared)
2804 Create a position independent executable
2807 Driver Joined Separate
2810 Common Report Var(flag_use_caller_save) Optimization
2811 Use caller save register across calls if possible
2813 ; This comment is to ensure we retain the blank line above.