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
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
888 After diagnosing undefined behavior attempt to continue execution
892 This switch is deprecated; use -fsanitize-recover= instead
894 fsanitize-undefined-trap-on-error
895 Common Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
896 Use trap instead of a library function for undefined behavior sanitization
898 fasynchronous-unwind-tables
899 Common Report Var(flag_asynchronous_unwind_tables) Optimization
900 Generate unwind tables that are exact at each instruction boundary
903 Common Report Var(flag_auto_inc_dec) Init(1)
904 Generate auto-inc/dec instructions
907 Common Report Var(flag_auto_profile) Optimization
908 Use sample profile information for call graph node weights. The default
909 profile file is fbdata.afdo in 'pwd'.
912 Common Joined RejectNegative Var(auto_profile_file)
913 Use sample profile information for call graph node weights. The profile
914 file is specified in the argument.
916 ; -fcheck-bounds causes gcc to generate array bounds checks.
917 ; For C, C++ and ObjC: defaults off.
918 ; For Java: defaults to on.
919 ; For Fortran: defaults to off.
921 Common Report Var(flag_bounds_check)
922 Generate code to check bounds before indexing arrays
925 Common Report Var(flag_branch_on_count_reg) Optimization
926 Replace add, compare, branch with branch on count register
928 fbranch-probabilities
929 Common Report Var(flag_branch_probabilities) Optimization
930 Use profiling information for branch probabilities
932 fbranch-target-load-optimize
933 Common Report Var(flag_branch_target_load_optimize) Optimization
934 Perform branch target load optimization before prologue / epilogue threading
936 fbranch-target-load-optimize2
937 Common Report Var(flag_branch_target_load_optimize2) Optimization
938 Perform branch target load optimization after prologue / epilogue threading
941 Common Report Var(flag_btr_bb_exclusive) Optimization
942 Restrict target load migration not to re-use registers in any basic block
945 Common Joined RejectNegative Var(common_deferred_options) Defer
946 -fcall-saved-<register> Mark <register> as being preserved across functions
949 Common Joined RejectNegative Var(common_deferred_options) Defer
950 -fcall-used-<register> Mark <register> as being corrupted by function calls
952 ; Nonzero for -fcaller-saves: allocate values in regs that need to
953 ; be saved across function calls, if that produces overall better code.
954 ; Optional now, so people can test it.
956 Common Report Var(flag_caller_saves) Optimization
957 Save registers around function calls
960 Common Report Var(flag_check_data_deps)
961 Compare the results of several data dependence analyzers.
964 Common Var(flag_check_new)
965 Check the return value of new in C++
967 fcombine-stack-adjustments
968 Common Report Var(flag_combine_stack_adjustments) Optimization
969 Looks for opportunities to reduce stack adjustments and stack references.
972 Common Report Var(flag_no_common,0) Optimization
973 Do not put uninitialized globals in the common section
977 ; Converted by the driver to -fcompare-debug= options.
980 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
981 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
983 fcompare-debug-second
984 Common Driver RejectNegative Var(flag_compare_debug)
985 Run only the second compilation of -fcompare-debug
988 Common Report Var(flag_compare_elim_after_reload) Optimization
989 Perform comparison elimination after register allocation has finished
992 Common Var(flag_conserve_stack) Optimization
993 Do not perform optimizations increasing noticeably stack usage
996 Common Report Var(flag_cprop_registers) Optimization
997 Perform a register copy-propagation optimization pass
1000 Common Report Var(flag_crossjumping) Optimization
1001 Perform cross-jumping optimization
1004 Common Report Var(flag_cse_follow_jumps) Optimization
1005 When running CSE, follow jumps to their targets
1009 Does nothing. Preserved for backward compatibility.
1012 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
1013 Omit range reduction step when performing complex division
1016 Common Report Var(flag_cx_fortran_rules) Optimization
1017 Complex multiplication and division follow Fortran rules
1020 Common Report Var(flag_data_sections) Optimization
1021 Place data items into their own section
1024 Common Report Var(common_deferred_options) Defer
1025 List all available debugging counters with their limits and counts.
1028 Common RejectNegative Joined Var(common_deferred_options) Defer
1029 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
1032 Common Joined RejectNegative Var(common_deferred_options) Defer
1033 Map one directory name to another in debug information
1035 fdebug-types-section
1036 Common Report Var(flag_debug_types_section) Init(0)
1037 Output .debug_types section when using DWARF v4 debuginfo.
1039 ; Nonzero for -fdefer-pop: don't pop args after each function call
1040 ; instead save them up to pop many calls' args with one insns.
1042 Common Report Var(flag_defer_pop) Optimization
1043 Defer popping functions args from stack until later
1046 Common Report Var(flag_delayed_branch) Optimization
1047 Attempt to fill delay slots of branch instructions
1049 fdelete-dead-exceptions
1050 Common Report Var(flag_delete_dead_exceptions) Init(0)
1051 Delete dead instructions that may throw exceptions
1053 fdelete-null-pointer-checks
1054 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
1055 Delete useless null pointer checks
1057 fdevirtualize-speculatively
1058 Common Report Var(flag_devirtualize_speculatively) Optimization
1059 Perform speculative devirtualization
1062 Common Report Var(flag_devirtualize) Optimization
1063 Try to convert virtual calls to direct ones.
1065 fdiagnostics-show-location=
1066 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1067 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
1069 ; Required for these enum values.
1074 Name(diagnostic_prefixing_rule) Type(int)
1077 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1080 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1082 fdiagnostics-show-caret
1083 Common Var(flag_diagnostics_show_caret) Init(1)
1084 Show the source line with a caret indicating the column
1087 Common Alias(fdiagnostics-color=,always,never)
1091 Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1092 -fdiagnostics-color=[never|always|auto] Colorize diagnostics
1094 ; Required for these enum values.
1099 Name(diagnostic_color_rule) Type(int)
1102 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1105 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1108 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1110 fdiagnostics-show-option
1111 Common Var(flag_diagnostics_show_option) Init(1)
1112 Amend appropriate diagnostic messages with the command line option that controls them
1115 Common Joined RejectNegative Var(common_deferred_options) Defer
1116 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1119 Common Joined RejectNegative Var(common_deferred_options) Defer
1120 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1123 Common Joined RejectNegative Var(common_deferred_options) Defer
1124 -fdump-<type> Dump various compiler internals to a file
1127 Driver RejectNegative
1130 Common RejectNegative Joined Var(flag_dump_final_insns)
1131 -fdump-final-insns=filename Dump to filename the insns at the end of translation
1134 Common RejectNegative Joined Var(flag_dump_go_spec)
1135 -fdump-go-spec=filename Write all declarations to file as Go code
1138 Common Report Var(flag_dump_noaddr)
1139 Suppress output of addresses in debugging dumps
1142 Common Driver Var(flag_report_bug)
1143 Collect and dump debug information into temporary file if ICE in C/C++
1147 Common Var(flag_dump_passes) Init(0)
1148 Dump optimization passes
1151 Common Report Var(flag_dump_unnumbered)
1152 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1154 fdump-unnumbered-links
1155 Common Report Var(flag_dump_unnumbered_links)
1156 Suppress output of previous and next insn numbers in debugging dumps
1159 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1160 Enable CFI tables via GAS assembler directives.
1163 Common Report Var(flag_early_inlining) Init(1) Optimization
1164 Perform early inlining
1166 feliminate-dwarf2-dups
1167 Common Report Var(flag_eliminate_dwarf2_dups)
1168 Perform DWARF2 duplicate elimination
1171 Common Report Var(flag_ipa_sra) Init(0) Optimization
1172 Perform interprocedural reduction of aggregates
1174 feliminate-unused-debug-symbols
1175 Common Report Var(flag_debug_only_used_symbols)
1176 Perform unused type elimination in debug info
1178 feliminate-unused-debug-types
1179 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1180 Perform unused type elimination in debug info
1182 femit-class-debug-always
1183 Common Report Var(flag_emit_class_debug_always) Init(0)
1184 Do not suppress C++ class debug information.
1187 Common Report Var(flag_exceptions) Optimization
1188 Enable exception handling
1190 fexpensive-optimizations
1191 Common Report Var(flag_expensive_optimizations) Optimization
1192 Perform a number of minor, expensive optimizations
1195 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1196 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1199 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1202 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1205 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1211 Common Var(flag_fat_lto_objects)
1212 Output lto objects containing both the intermediate language and binary output.
1215 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1216 Assume no NaNs or infinities are generated
1219 Common Joined RejectNegative Var(common_deferred_options) Defer
1220 -ffixed-<register> Mark <register> as being unavailable to the compiler
1223 Common Report Var(flag_float_store) Optimization
1224 Don't allocate floats and doubles in extended-precision registers
1228 Does nothing. Preserved for backward compatibility.
1231 Common Report Var(flag_forward_propagate) Optimization
1232 Perform a forward propagation pass on RTL
1235 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1236 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1239 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1242 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1244 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1246 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1249 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1251 ; Nonzero means don't put addresses of constant functions in registers.
1252 ; Used for compiling the Unix kernel, where strange substitutions are
1253 ; done on the assembly output.
1255 Common Report Var(flag_no_function_cse,0)
1256 Allow function addresses to be held in registers
1259 Common Report Var(flag_function_sections)
1260 Place each function into its own section
1263 Common Report Var(flag_gcse) Optimization
1264 Perform global common subexpression elimination
1267 Common Report Var(flag_gcse_lm) Init(1) Optimization
1268 Perform enhanced load motion during global common subexpression elimination
1271 Common Report Var(flag_gcse_sm) Init(0) Optimization
1272 Perform store motion after global common subexpression elimination
1275 Common Report Var(flag_gcse_las) Init(0) Optimization
1276 Perform redundant load after store elimination in global common subexpression
1280 Common Report Var(flag_gcse_after_reload) Optimization
1281 Perform global common subexpression elimination after register allocation
1284 ; This option is not documented yet as its semantics will change.
1286 Common Report Var(flag_graphite)
1287 Enable in and out of Graphite representation
1290 Common Report Var(flag_graphite_identity) Optimization
1291 Enable Graphite Identity transformation
1293 fgraphite-code-generator=
1294 Common Report RejectNegative Joined Optimization Enum(fgraphite_generator) Var(flag_graphite_code_gen) Init(FGRAPHITE_CODE_GEN_ISL)
1295 Choose code generator of Graphite
1298 Name(fgraphite_generator) Type(enum fgraphite_generator) UnknownError(unknown code generator of graphite %qs)
1301 Enum(fgraphite_generator) String(isl) Value(FGRAPHITE_CODE_GEN_ISL)
1304 Enum(fgraphite_generator) String(cloog) Value(FGRAPHITE_CODE_GEN_CLOOG)
1306 fhoist-adjacent-loads
1307 Common Report Var(flag_hoist_adjacent_loads) Optimization
1308 Enable hoisting adjacent loads to encourage generating conditional move
1311 floop-parallelize-all
1312 Common Report Var(flag_loop_parallelize_all) Optimization
1313 Mark all loops as parallel
1316 Common Report Var(flag_loop_strip_mine) Optimization
1317 Enable Loop Strip Mining transformation
1320 Common Report Var(flag_loop_interchange) Optimization
1321 Enable Loop Interchange transformation
1324 Common Report Var(flag_loop_block) Optimization
1325 Enable Loop Blocking transformation
1328 Common Report Var(flag_tm)
1329 Enable support for GNU transactional memory
1332 Common Report Var(flag_gnu_unique) Init(1)
1333 Use STB_GNU_UNIQUE if supported by the assembler
1337 Does nothing. Preserved for backward compatibility.
1340 Common Report Var(flag_loop_optimize_isl) Optimization
1341 Enable the ISL based loop nest optimizer
1343 fstrict-volatile-bitfields
1344 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1345 Force bitfield accesses to match their type width
1347 fguess-branch-probability
1348 Common Report Var(flag_guess_branch_prob) Optimization
1349 Enable guessing of branch probabilities
1351 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1352 ; Generate position-independent code for executables if possible
1353 ; On SVR4 targets, it also controls whether or not to emit a
1354 ; string identifying the compiler.
1356 Common Report Var(flag_no_ident,0)
1357 Process #ident directives
1360 Common Report Var(flag_if_conversion) Optimization
1361 Perform conversion of conditional jumps to branchless equivalents
1364 Common Report Var(flag_if_conversion2) Optimization
1365 Perform conversion of conditional jumps to conditional execution
1368 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1369 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1372 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1375 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1378 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1381 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1383 ftree-loop-if-convert
1384 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1385 Convert conditional jumps in innermost loops to branchless equivalents
1387 ftree-loop-if-convert-stores
1388 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1389 Also if-convert conditional jumps containing memory writes
1391 ; -finhibit-size-directive inhibits output of .size for ELF.
1392 ; This is used only for compiling crtstuff.c,
1393 ; and it may be extended to other effects
1394 ; needed for crtstuff.c on other systems.
1395 finhibit-size-directive
1396 Common Report Var(flag_inhibit_size_directive)
1397 Do not generate .size directives
1400 Common Report Var(flag_indirect_inlining)
1401 Perform indirect inlining
1403 ; General flag to enable inlining. Specifying -fno-inline will disable
1404 ; all inlining apart from always-inline functions.
1406 Common Report Var(flag_no_inline,0) Init(0) Optimization
1407 Enable inlining of function declared \"inline\", disabling disables all inlining
1409 finline-small-functions
1410 Common Report Var(flag_inline_small_functions) Optimization
1411 Integrate functions into their callers when code size is known not to grow
1414 Common Report Var(flag_inline_functions) Optimization
1415 Integrate functions not declared \"inline\" into their callers when profitable
1417 finline-functions-called-once
1418 Common Report Var(flag_inline_functions_called_once) Optimization
1419 Integrate functions only required by their single caller
1422 Common RejectNegative Joined Alias(finline-limit=)
1425 Common RejectNegative Joined UInteger
1426 -finline-limit=<number> Limit the size of inlined functions to <number>
1429 Common Report Var(flag_inline_atomics) Init(1) Optimization
1430 Inline __atomic operations when a lock free instruction sequence is available.
1432 finstrument-functions
1433 Common Report Var(flag_instrument_function_entry_exit)
1434 Instrument function entry and exit with profiling calls
1436 finstrument-functions-exclude-function-list=
1437 Common RejectNegative Joined
1438 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1440 finstrument-functions-exclude-file-list=
1441 Common RejectNegative Joined
1442 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1445 Common Report Var(flag_ipa_cp) Optimization
1446 Perform interprocedural constant propagation
1449 Common Report Var(flag_ipa_cp_clone) Optimization
1450 Perform cloning to make Interprocedural constant propagation stronger
1453 Common Report Var(flag_ipa_profile) Init(0) Optimization
1454 Perform interprocedural profile propagation
1457 Common Report Var(flag_ipa_pta) Init(0) Optimization
1458 Perform interprocedural points-to analysis
1461 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1462 Discover pure and const functions
1465 Common Report Var(flag_ipa_icf) Optimization
1466 Perform Identical Code Folding for functions and read-only variables
1469 Common Report Var(flag_ipa_icf_functions) Optimization
1470 Perform Identical Code Folding for functions
1473 Common Report Var(flag_ipa_icf_variables) Optimization
1474 Perform Identical Code Folding for variables
1477 Common Report Var(flag_ipa_reference) Init(0) Optimization
1478 Discover readonly and non addressable static variables
1482 Does nothing. Preserved for backward compatibility.
1486 Does nothing. Preserved for backward compatibility.
1489 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1490 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1493 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1496 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1499 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1502 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1503 -fira-region=[one|all|mixed] Set regions for IRA
1506 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1509 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1512 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1515 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1518 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1519 Use IRA based register pressure calculation
1520 in RTL hoist optimizations.
1523 Common Report Var(flag_ira_loop_pressure) Optimization
1524 Use IRA based register pressure calculation
1525 in RTL loop optimizations.
1527 fira-share-save-slots
1528 Common Report Var(flag_ira_share_save_slots) Init(1)
1529 Share slots for saving different hard registers.
1531 fira-share-spill-slots
1532 Common Report Var(flag_ira_share_spill_slots) Init(1)
1533 Share stack slots for spilled pseudo-registers.
1536 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1537 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1540 Common Report Var(flag_ivopts) Init(1) Optimization
1541 Optimize induction variables on trees
1544 Common Var(flag_jump_tables) Init(1) Optimization
1545 Use jump tables for sufficiently large switch statements
1547 fkeep-inline-functions
1548 Common Report Var(flag_keep_inline_functions)
1549 Generate code for functions even if they are fully inlined
1552 Common Report Var(flag_keep_static_consts) Init(1)
1553 Emit static const variables even if they are not used
1556 Common Report Var(flag_leading_underscore) Init(-1)
1557 Give external symbols a leading underscore
1561 Does nothing. Preserved for backward compatibility.
1565 Enable link-time optimization.
1568 Common RejectNegative Joined Var(flag_lto)
1569 Link-time optimization with number of parallel jobs or jobserver.
1572 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1575 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1578 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1581 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1584 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1587 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1590 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1591 Specify the algorithm to partition symbols and vars at linktime
1593 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1594 flto-compression-level=
1595 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1596 -flto-compression-level=<number> Use zlib compression level <number> for IL
1598 flto-odr-type-merging
1599 Common Report Var(flag_lto_odr_type_mering) Init(1)
1600 Merge C++ types using One Definition Rule
1603 Common Report Var(flag_lto_report) Init(0)
1604 Report various link-time optimization statistics
1607 Common Report Var(flag_lto_report_wpa) Init(0)
1608 Report various link-time optimization statistics for WPA only
1611 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1612 Set errno after built-in math functions
1615 Common Joined RejectNegative UInteger Var(flag_max_errors)
1616 -fmax-errors=<number> Maximum number of errors to report
1619 Common Report Var(mem_report)
1620 Report on permanent memory allocation
1623 Common Report Var(mem_report_wpa)
1624 Report on permanent memory allocation in WPA only
1626 ; This will attempt to merge constant section constants, if 1 only
1627 ; string constants and constants from constant pool, if 2 also constant
1629 fmerge-all-constants
1630 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1631 Attempt to merge identical constants and constant variables
1634 Common Report Var(flag_merge_constants,1) Optimization
1635 Attempt to merge identical constants across compilation units
1637 fmerge-debug-strings
1638 Common Report Var(flag_merge_debug_strings) Init(1)
1639 Attempt to merge identical debug strings across compilation units
1642 Common RejectNegative Joined UInteger
1643 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1646 Common Report Var(flag_modulo_sched) Optimization
1647 Perform SMS based modulo scheduling before the first scheduling pass
1649 fmodulo-sched-allow-regmoves
1650 Common Report Var(flag_modulo_sched_allow_regmoves)
1651 Perform SMS based modulo scheduling with register moves allowed
1653 fmove-loop-invariants
1654 Common Report Var(flag_move_loop_invariants) Optimization
1655 Move loop invariant computations out of loops
1658 Common Var(flag_dce) Init(1) Optimization
1659 Use the RTL dead code elimination pass
1662 Common Var(flag_dse) Init(1) Optimization
1663 Use the RTL dead store elimination pass
1665 freschedule-modulo-scheduled-loops
1666 Common Report Var(flag_resched_modulo_sched) Optimization
1667 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1669 fnon-call-exceptions
1670 Common Report Var(flag_non_call_exceptions) Optimization
1671 Support synchronous non-call exceptions
1674 Common Report Var(flag_omit_frame_pointer) Optimization
1675 When possible do not generate stack frames
1678 Common Report Var(flag_opt_info) Optimization
1679 Enable all optimization info dumps on stderr
1682 Common Joined RejectNegative Var(common_deferred_options) Defer
1683 -fopt-info[-<type>=filename] Dump compiler optimization details
1685 foptimize-register-move
1687 Does nothing. Preserved for backward compatibility.
1689 foptimize-sibling-calls
1690 Common Report Var(flag_optimize_sibling_calls) Optimization
1691 Optimize sibling and tail recursive calls
1694 Common Report Var(flag_partial_inlining)
1695 Perform partial inlining
1698 Common Report Var(pre_ipa_mem_report)
1699 Report on memory allocation before interprocedural optimization
1701 fpost-ipa-mem-report
1702 Common Report Var(post_ipa_mem_report)
1703 Report on memory allocation before interprocedural optimization
1706 Common Report Var(flag_pack_struct) Optimization
1707 Pack structure members together without holes
1710 Common RejectNegative Joined UInteger Optimization
1711 -fpack-struct=<number> Set initial maximum structure member alignment
1714 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1715 Return small aggregates in memory, not registers
1718 Common Report Var(flag_peel_loops) Optimization
1719 Perform loop peeling
1722 Common Report Var(flag_no_peephole,0) Optimization
1723 Enable machine specific peephole optimizations
1726 Common Report Var(flag_peephole2) Optimization
1727 Enable an RTL peephole pass before sched2
1730 Common Report Var(flag_pic,2) Negative(fPIE)
1731 Generate position-independent code if possible (large mode)
1734 Common Report Var(flag_pie,2) Negative(fpic)
1735 Generate position-independent code for executables if possible (large mode)
1738 Common Report Var(flag_pic,1) Negative(fpie)
1739 Generate position-independent code if possible (small mode)
1742 Common Report Var(flag_pie,1) Negative(fPIC)
1743 Generate position-independent code for executables if possible (small mode)
1746 Common Joined RejectNegative Var(common_deferred_options) Defer
1747 Specify a plugin to load
1750 Common Joined RejectNegative Var(common_deferred_options) Defer
1751 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1753 fpredictive-commoning
1754 Common Report Var(flag_predictive_commoning) Optimization
1755 Run predictive commoning optimization.
1757 fprefetch-loop-arrays
1758 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1759 Generate prefetch instructions, if available, for arrays in loops
1762 Common Report Var(profile_flag)
1763 Enable basic program profiling code
1766 Common Report Var(profile_arc_flag)
1767 Insert arc-based program profiling code
1770 Common Joined RejectNegative Var(profile_data_prefix)
1771 Set the top-level directory for storing the profile data.
1772 The default is 'pwd'.
1775 Common Report Var(flag_profile_correction)
1776 Enable correction of flow inconsistent profile data input
1780 Enable common options for generating profile info for profile feedback directed optimizations
1783 Common Joined RejectNegative
1784 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1787 Common Var(flag_profile_use)
1788 Enable common options for performing profile feedback directed optimizations
1791 Common Joined RejectNegative
1792 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1795 Common Report Var(flag_profile_values)
1796 Insert code to profile values of expressions
1799 Common Report Var(profile_report)
1800 Report on consistency of profile
1802 fprofile-reorder-functions
1803 Common Report Var(flag_profile_reorder_functions)
1804 Enable function reordering that improves code placement
1807 Common Var(common_deferred_options) Defer
1810 Common Joined RejectNegative Var(common_deferred_options) Defer
1811 -frandom-seed=<string> Make compile reproducible using <string>
1813 ; This switch causes the command line that was used to create an
1814 ; object file to be recorded into the object file. The exact format
1815 ; of this recording is target and binary file format dependent.
1816 ; It is related to the -fverbose-asm switch, but that switch only
1817 ; records information in the assembler output file as comments, so
1818 ; they never reach the object file.
1819 frecord-gcc-switches
1820 Common Report Var(flag_record_gcc_switches)
1821 Record gcc command line switches in the object file.
1824 Common Report Var(flag_pcc_struct_return,0) Optimization
1825 Return small aggregates in registers
1829 Does nothing. Preserved for backward compatibility.
1831 flive-range-shrinkage
1832 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
1833 Relief of register pressure through live range shrinkage
1836 Common Report Var(flag_rename_registers) Init(2) Optimization
1837 Perform a register renaming optimization pass
1840 Common Report Var(flag_reorder_blocks) Optimization
1841 Reorder basic blocks to improve code placement
1843 freorder-blocks-and-partition
1844 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1845 Reorder basic blocks and partition into hot and cold sections
1848 Common Report Var(flag_reorder_functions) Optimization
1849 Reorder functions to improve code placement
1851 frerun-cse-after-loop
1852 Common Report Var(flag_rerun_cse_after_loop) Optimization
1853 Add a common subexpression elimination pass after loop optimizations
1857 Does nothing. Preserved for backward compatibility.
1860 Common Report Var(flag_rounding_math) Optimization SetByCombined
1861 Disable optimizations that assume default FP rounding behavior
1864 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1865 Enable scheduling across basic blocks
1868 Common Report Var(flag_sched_pressure) Init(0) Optimization
1869 Enable register pressure sensitive insn scheduling
1872 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1873 Allow speculative motion of non-loads
1876 Common Report Var(flag_schedule_speculative_load) Optimization
1877 Allow speculative motion of some loads
1879 fsched-spec-load-dangerous
1880 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1881 Allow speculative motion of more loads
1884 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1885 -fsched-verbose=<number> Set the verbosity level of the scheduler
1887 fsched2-use-superblocks
1888 Common Report Var(flag_sched2_use_superblocks) Optimization
1889 If scheduling post reload, do superblock scheduling
1893 Does nothing. Preserved for backward compatibility.
1896 Common Report Var(flag_schedule_insns) Optimization
1897 Reschedule instructions before register allocation
1900 Common Report Var(flag_schedule_insns_after_reload) Optimization
1901 Reschedule instructions after register allocation
1903 ; This flag should be on when a target implements non-trivial
1904 ; scheduling hooks, maybe saving some information for its own sake.
1905 ; On IA64, for example, this is used for correct bundling.
1906 fselective-scheduling
1907 Common Report Var(flag_selective_scheduling) Optimization
1908 Schedule instructions using selective scheduling algorithm
1910 fselective-scheduling2
1911 Common Report Var(flag_selective_scheduling2) Optimization
1912 Run selective scheduling after reload
1914 fsel-sched-pipelining
1915 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1916 Perform software pipelining of inner loops during selective scheduling
1918 fsel-sched-pipelining-outer-loops
1919 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1920 Perform software pipelining of outer loops during selective scheduling
1922 fsel-sched-reschedule-pipelined
1923 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1924 Reschedule pipelined regions without pipelining
1926 fsemantic-interposition
1927 Common Report Var(flag_semantic_interposition) Init(1)
1928 Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker
1930 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1931 ; of stalled insns into the ready list.
1932 fsched-stalled-insns
1933 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1934 Allow premature scheduling of queued insns
1936 fsched-stalled-insns=
1937 Common RejectNegative Joined UInteger
1938 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1940 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1941 ; be examined for a dependency on a stalled insn that is candidate for
1942 ; premature removal from the queue of stalled insns into the ready list (has
1943 ; an effect only if the flag 'sched_stalled_insns' is set).
1944 fsched-stalled-insns-dep
1945 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1946 Set dependence distance checking in premature scheduling of queued insns
1948 fsched-stalled-insns-dep=
1949 Common RejectNegative Joined UInteger
1950 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1952 fsched-group-heuristic
1953 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1954 Enable the group heuristic in the scheduler
1956 fsched-critical-path-heuristic
1957 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1958 Enable the critical path heuristic in the scheduler
1960 fsched-spec-insn-heuristic
1961 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1962 Enable the speculative instruction heuristic in the scheduler
1964 fsched-rank-heuristic
1965 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1966 Enable the rank heuristic in the scheduler
1968 fsched-last-insn-heuristic
1969 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1970 Enable the last instruction heuristic in the scheduler
1972 fsched-dep-count-heuristic
1973 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1974 Enable the dependent count heuristic in the scheduler
1977 Common Report Var(flag_section_anchors) Optimization
1978 Access data in the same section from shared anchor points
1982 Does nothing. Preserved for backward compatibility.
1986 Does nothing. Preserved for backward compatibility.
1989 Common Report Var(flag_ree) Init(0)
1990 Turn on Redundant Extensions Elimination pass.
1993 Common Report Var(flag_show_column) Init(1)
1994 Show column numbers in diagnostics, when available. Default on
1997 Common Report Var(flag_shrink_wrap) Optimization
1998 Emit function prologues only before parts of the function that need it,
1999 rather than at the top of the function.
2002 Common Report Var(flag_signaling_nans) Optimization SetByCombined
2003 Disable optimizations observable by IEEE signaling NaNs
2006 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
2007 Disable floating point optimizations that ignore the IEEE signedness of zero
2009 fsingle-precision-constant
2010 Common Report Var(flag_single_precision_constant) Optimization
2011 Convert floating point constants to single precision constants
2013 fsplit-ivs-in-unroller
2014 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
2015 Split lifetimes of induction variables when loops are unrolled
2018 Common Report Var(flag_split_stack) Init(-1)
2019 Generate discontiguous stack frames
2022 Common Report Var(flag_split_wide_types) Optimization
2023 Split wide types into independent registers
2026 Common Report Var(flag_ssa_phiopt) Optimization
2027 Optimize conditional patterns using SSA PHI nodes
2029 fvariable-expansion-in-unroller
2030 Common Report Var(flag_variable_expansion_in_unroller) Optimization
2031 Apply variable expansion when loops are unrolled
2034 Common Report RejectNegative Joined
2035 -fstack-check=[no|generic|specific] Insert stack checking code into the program
2038 Common Alias(fstack-check=, specific, no)
2039 Insert stack checking code into the program. Same as -fstack-check=specific
2042 Common Var(common_deferred_options) Defer
2044 fstack-limit-register=
2045 Common RejectNegative Joined Var(common_deferred_options) Defer
2046 -fstack-limit-register=<register> Trap if the stack goes past <register>
2048 fstack-limit-symbol=
2049 Common RejectNegative Joined Var(common_deferred_options) Defer
2050 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
2053 Common Report Var(flag_stack_protect, 1)
2054 Use propolice as a stack protection method
2056 fstack-protector-all
2057 Common Report RejectNegative Var(flag_stack_protect, 2)
2058 Use a stack protection method for every function
2060 fstack-protector-strong
2061 Common Report RejectNegative Var(flag_stack_protect, 3)
2062 Use a smart stack protection method for certain functions
2065 Common RejectNegative Var(flag_stack_usage)
2066 Output stack usage information on a per-function basis
2070 Does nothing. Preserved for backward compatibility.
2072 ; Nonzero if we should do (language-dependent) alias analysis.
2073 ; Typically, this analysis will assume that expressions of certain
2074 ; types do not alias expressions of certain other types. Only used
2075 ; if alias analysis (in general) is enabled.
2077 Common Report Var(flag_strict_aliasing) Optimization
2078 Assume strict aliasing rules apply
2081 Common Report Var(flag_strict_overflow)
2082 Treat signed overflow as undefined
2085 Common Report Var(flag_sync_libcalls) Init(1)
2086 Implement __atomic operations via libcalls to legacy __sync functions
2089 Common Report Var(flag_syntax_only)
2090 Check for syntax errors, then stop
2093 Common Report Var(flag_test_coverage)
2094 Create data files needed by \"gcov\"
2097 Common Report Var(flag_thread_jumps) Optimization
2098 Perform jump threading optimizations
2101 Common Report Var(time_report)
2102 Report the time taken by each compiler pass
2105 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2106 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
2109 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2112 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2115 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2118 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2121 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2124 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
2125 Reorder top level functions, variables, and asms
2128 Common Report Var(flag_tracer)
2129 Perform superblock formation via tail duplication
2131 ; Zero means that floating-point math operations cannot generate a
2132 ; (user-visible) trap. This is the case, for example, in nonstop
2133 ; IEEE 754 arithmetic.
2135 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2136 Assume floating-point operations can trap
2139 Common Report Var(flag_trapv) Optimization
2140 Trap for signed overflow in addition, subtraction and multiplication
2143 Common Report Var(flag_tree_ccp) Optimization
2144 Enable SSA-CCP optimization on trees
2147 Common Report Var(flag_tree_bit_ccp) Optimization
2148 Enable SSA-BIT-CCP optimization on trees
2152 Does nothing. Preserved for backward compatibility.
2155 Common Report Var(flag_tree_ch) Optimization
2156 Enable loop header copying on trees
2158 ftree-coalesce-inlined-vars
2159 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2160 Enable coalescing of copy-related user variables that are inlined
2163 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2164 Enable coalescing of all copy-related user variables
2167 Common Report Var(flag_tree_copyrename) Optimization
2168 Replace SSA temporaries with better names in copies
2171 Common Report Var(flag_tree_copy_prop) Optimization
2172 Enable copy propagation on trees
2174 ftree-store-copy-prop
2176 Does nothing. Preserved for backward compatibility.
2179 Common Report Var(flag_tree_cselim) Init(2) Optimization
2180 Transform condition stores into unconditional ones
2182 ftree-switch-conversion
2183 Common Report Var(flag_tree_switch_conversion) Optimization
2184 Perform conversions of switch initializations.
2187 Common Report Var(flag_tree_dce) Optimization
2188 Enable SSA dead code elimination optimization on trees
2190 ftree-dominator-opts
2191 Common Report Var(flag_tree_dom) Optimization
2192 Enable dominator optimizations
2195 Common Report Var(flag_tree_tail_merge) Optimization
2196 Enable tail merging on trees
2199 Common Report Var(flag_tree_dse) Optimization
2200 Enable dead store elimination
2203 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2204 Enable forward propagation on trees
2207 Common Report Var(flag_tree_fre) Optimization
2208 Enable Full Redundancy Elimination (FRE) on trees
2211 Common Report Var(flag_optimize_strlen) Optimization
2212 Enable string length optimizations on trees
2214 fisolate-erroneous-paths-dereference
2215 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2216 Detect paths which trigger erroneous or undefined behaviour due to
2217 dereferencing a NULL pointer. Isolate those paths from the main control
2218 flow and turn the statement with erroneous or undefined behaviour into a trap.
2220 fisolate-erroneous-paths-attribute
2221 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2222 Detect paths which trigger erroneous or undefined behaviour due a NULL value
2223 being used in a way which is forbidden by a returns_nonnull or nonnull
2224 attribute. Isolate those paths from the main control flow and turn the
2225 statement with erroneous or undefined behaviour into a trap.
2227 ftree-loop-distribution
2228 Common Report Var(flag_tree_loop_distribution) Optimization
2229 Enable loop distribution on trees
2231 ftree-loop-distribute-patterns
2232 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2233 Enable loop distribution for patterns transformed into a library call
2236 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2237 Enable loop invariant motion on trees
2240 Common Alias(floop-interchange)
2241 Enable loop interchange transforms. Same as -floop-interchange
2244 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2245 Create canonical induction variables in loops
2248 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2249 Enable loop optimizations on tree level
2251 ftree-parallelize-loops=
2252 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2253 Enable automatic parallelization of loops
2256 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2257 Enable hoisting loads from conditional pointers.
2260 Common Report Var(flag_tree_pre) Optimization
2261 Enable SSA-PRE optimization on trees
2264 Common Report Var(flag_tree_partial_pre) Optimization
2265 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2268 Common Report Var(flag_tree_pta) Optimization
2269 Perform function-local points-to analysis on trees.
2272 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2273 Enable reassociation on tree level
2277 Does nothing. Preserved for backward compatibility.
2280 Common Report Var(flag_tree_sink) Optimization
2281 Enable SSA code sinking on trees
2284 Common Report Var(flag_tree_slsr) Optimization
2285 Perform straight-line strength reduction
2288 Common Report Var(flag_tree_sra) Optimization
2289 Perform scalar replacement of aggregates
2292 Common Report Var(flag_tree_ter) Optimization
2293 Replace temporary expressions in the SSA->normal pass
2296 Common Report Var(flag_tree_live_range_split) Optimization
2297 Perform live range splitting during the SSA->normal pass
2300 Common Report Var(flag_tree_vrp) Init(0) Optimization
2301 Perform Value Range Propagation on trees
2304 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2305 Compile whole compilation unit at a time
2308 Common Report Var(flag_unroll_loops) Optimization
2309 Perform loop unrolling when iteration count is known
2312 Common Report Var(flag_unroll_all_loops) Optimization
2313 Perform loop unrolling for all loops
2315 ; Nonzero means that loop optimizer may assume that the induction variables
2316 ; that control loops do not overflow and that the loops with nontrivial
2317 ; exit condition are not infinite
2318 funsafe-loop-optimizations
2319 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2320 Allow loop optimizations to assume that the loops behave in normal way
2323 Common Report Var(flag_associative_math) SetByCombined
2324 Allow optimization for floating-point arithmetic which may change the
2325 result of the operation due to rounding.
2328 Common Report Var(flag_reciprocal_math) SetByCombined
2329 Same as -fassociative-math for expressions which include division.
2331 ; Nonzero means that unsafe floating-point math optimizations are allowed
2332 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2333 ; are allowed to assume that their arguments and results are "normal"
2334 ; (e.g., nonnegative for SQRT).
2335 funsafe-math-optimizations
2336 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2337 Allow math optimizations that may violate IEEE or ISO standards
2340 Common Report Var(flag_unswitch_loops) Optimization
2341 Perform loop unswitching
2344 Common Report Var(flag_unwind_tables) Optimization
2345 Just generate unwind tables for exception handling
2348 Common Driver Negative(fuse-ld=gold)
2349 Use the bfd linker instead of the default linker
2352 Common Driver Negative(fuse-ld=bfd)
2353 Use the gold linker instead of the default linker
2356 Common Undocumented Var(flag_use_linker_plugin)
2358 ; Positive if we should track variables, negative if we should run
2359 ; the var-tracking pass only to discard debug annotations, zero if
2360 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2361 ; will be set according to optimize, debug_info_level and debug_hooks
2362 ; in process_options ().
2364 Common Report Var(flag_var_tracking) Init(2) Optimization
2365 Perform variable tracking
2367 ; Positive if we should track variables at assignments, negative if
2368 ; we should run the var-tracking pass only to discard debug
2369 ; annotations. When flag_var_tracking_assignments ==
2370 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2371 fvar-tracking-assignments
2372 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2373 Perform variable tracking by annotating assignments
2375 ; Nonzero if we should toggle flag_var_tracking_assignments after
2376 ; processing options and computing its default. */
2377 fvar-tracking-assignments-toggle
2378 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2379 Toggle -fvar-tracking-assignments
2381 ; Positive if we should track uninitialized variables, negative if
2382 ; we should run the var-tracking pass only to discard debug
2383 ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
2384 ; will be set according to flag_var_tracking.
2385 fvar-tracking-uninit
2386 Common Report Var(flag_var_tracking_uninit) Optimization
2387 Perform variable tracking and also tag variables that are uninitialized
2390 Common Report Var(flag_tree_vectorize) Optimization
2391 Enable vectorization on trees
2393 ftree-vectorizer-verbose=
2394 Common Joined RejectNegative Ignore
2395 Does nothing. Preserved for backward compatibility.
2397 ftree-loop-vectorize
2398 Common Report Var(flag_tree_loop_vectorize) Optimization
2399 Enable loop vectorization on trees
2402 Common Report Var(flag_tree_slp_vectorize) Optimization
2403 Enable basic block vectorization (SLP) on trees
2406 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT)
2407 Specifies the cost model for vectorization
2410 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED)
2411 Specifies the vectorization cost model for code marked with a simd directive
2414 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2417 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2420 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2423 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2426 Common RejectNegative Alias(fvect-cost-model=,dynamic)
2427 Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
2430 Common RejectNegative Alias(fvect-cost-model=,unlimited)
2431 Enables the unlimited vectorizer cost model. Preserved for backward compatibility.
2433 ftree-vect-loop-version
2435 Does nothing. Preserved for backward compatibility.
2438 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2439 Enable copy propagation of scalar-evolution information.
2441 ; -fverbose-asm causes extra commentary information to be produced in
2442 ; the generated assembly code (to make it more readable). This option
2443 ; is generally only of use to those who actually need to read the
2444 ; generated assembly code (perhaps while debugging the compiler itself).
2445 ; -fno-verbose-asm, the default, causes the extra information
2446 ; to not be added and is useful when comparing two assembler files.
2448 Common Report Var(flag_verbose_asm)
2449 Add extra commentary to assembler output
2452 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2453 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2456 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2459 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2462 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2465 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2468 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2471 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2472 Validate vtable pointers before using them.
2475 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2478 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2481 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2484 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2487 Common Var(flag_vtv_counts)
2488 Output vtable verification counters.
2491 Common Var(flag_vtv_debug)
2492 Output vtable verification pointer sets information.
2495 Common Report Var(flag_value_profile_transformations) Optimization
2496 Use expression value profiles in optimizations
2499 Common Report Var(flag_web) Init(2) Optimization
2500 Construct webs and split unrelated uses of single variable
2502 ftree-builtin-call-dce
2503 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2504 Enable conditional dead code elimination for builtin calls
2507 Common Report Var(flag_whole_program) Init(0) Optimization
2508 Perform whole program optimizations
2511 Common Report Var(flag_wrapv) Optimization
2512 Assume signed arithmetic overflow wraps around
2514 fzero-initialized-in-bss
2515 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2516 Put zero initialized data in the bss section
2519 Common JoinedOrMissing
2520 Generate debug information in default format
2523 Common JoinedOrMissing Negative(gdwarf)
2524 Generate debug information in COFF format
2527 Common JoinedOrMissing Negative(gdwarf-)
2528 Generate debug information in default version of DWARF format
2531 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2532 Generate debug information in DWARF v2 (or later) format
2535 Common JoinedOrMissing
2536 Generate debug information in default extended format
2539 Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2540 Don't generate DWARF pubnames and pubtypes sections.
2543 Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2544 Generate DWARF pubnames and pubtypes sections.
2547 Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2548 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2550 gno-record-gcc-switches
2551 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2552 Don't record gcc command line switches in DWARF DW_AT_producer.
2554 grecord-gcc-switches
2555 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2556 Record gcc command line switches in DWARF DW_AT_producer.
2559 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2560 Don't generate debug information in separate .dwo files
2563 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2564 Generate debug information in separate .dwo files
2567 Common JoinedOrMissing Negative(gstabs+)
2568 Generate debug information in STABS format
2571 Common JoinedOrMissing Negative(gvms)
2572 Generate debug information in extended STABS format
2575 Common RejectNegative Var(dwarf_strict,0) Init(0)
2576 Emit DWARF additions beyond selected version
2579 Common Report RejectNegative Var(dwarf_strict,1)
2580 Don't emit DWARF additions beyond selected version
2583 Common Report Var(flag_gtoggle)
2584 Toggle debug information generation
2587 Common JoinedOrMissing Negative(gxcoff)
2588 Generate debug information in VMS format
2591 Common JoinedOrMissing Negative(gxcoff+)
2592 Generate debug information in XCOFF format
2595 Common JoinedOrMissing Negative(gcoff)
2596 Generate debug information in extended XCOFF format
2599 Name(compressed_debug_sections) Type(int)
2601 ; Since -gz= is completely handled in specs, the values aren't used and we
2602 ; assign arbitrary constants.
2604 Enum(compressed_debug_sections) String(none) Value(0)
2607 Enum(compressed_debug_sections) String(zlib) Value(1)
2610 Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
2614 Generate compressed debug sections
2617 Common Driver Joined Enum(compressed_debug_sections)
2618 -gz=<format> Generate compressed debug sections in format <format>
2621 Driver Joined Separate
2624 Common Joined Var(plugindir_string) Init(0)
2625 -iplugindir=<dir> Set <dir> to be the default plugin directory
2628 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2629 -imultiarch <dir> Set <dir> to be the multiarch include subdirectory
2632 Driver Joined Separate
2637 no-canonical-prefixes
2650 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2651 -o <file> Place output into <file>
2654 Common Var(profile_flag)
2655 Enable function profiling
2658 Driver Var(pass_exit_codes)
2661 Common Alias(Wpedantic)
2664 Common Var(flag_pedantic_errors)
2665 Like -pedantic but issue them as errors
2671 Driver Var(use_pipes)
2674 Driver JoinedOrMissing Var(print_file_name)
2676 print-libgcc-file-name
2679 print-multi-directory
2680 Driver Var(print_multi_directory)
2683 Driver Var(print_multi_lib)
2685 print-multi-os-directory
2686 Driver Var(print_multi_os_directory)
2689 Driver Var(print_multiarch)
2692 Driver JoinedOrMissing Var(print_prog_name)
2695 Driver Var(print_search_dirs)
2698 Driver Var(print_sysroot)
2700 print-sysroot-headers-suffix
2701 Driver Var(print_sysroot_headers_suffix)
2704 Common Var(quiet_flag) RejectDriver
2705 Do not display functions compiled or elapsed time
2723 Driver Var(report_times)
2726 Driver JoinedOrMissing
2729 Driver Joined Separate
2733 ; C option, but driver must not handle as "-u ndef".
2736 Common Driver Var(verbose_flag)
2737 Enable verbose output
2740 Common Var(version_flag) RejectDriver
2741 Display the compiler's version
2744 Common Var(inhibit_warnings)
2748 Driver Separate Var(wrapper_string)
2751 Driver Joined Separate
2754 Driver RejectNegative Negative(pie)
2755 Create a shared library
2761 Driver Separate Alias(specs=)
2774 ; Documented for Fortran, but always accepted by driver.
2781 ; Documented for Go, but always accepted by driver.
2799 Driver RejectNegative Negative(shared)
2800 Create a position independent executable
2803 Driver Joined Separate
2806 Common Report Var(flag_use_caller_save) Optimization
2807 Use caller save register across calls if possible
2809 ; This comment is to ensure we retain the blank line above.