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 ; Flag whether a prefix has been added to dump_base_name
216 bool dump_base_name_prefixed = false
228 Driver Alias(coverage)
234 Common Separate Alias(d)
237 Common Joined Alias(d)
240 Common Separate Alias(dumpbase)
243 Common Separate Alias(dumpdir)
246 Driver Separate Alias(e)
249 Driver Joined Alias(e)
252 Common Warning Alias(Wextra)
255 Driver Separate Alias(Xassembler)
258 Driver JoinedOrMissing Alias(Xassembler)
261 Driver Separate Alias(Xlinker)
264 Driver JoinedOrMissing Alias(Xlinker)
267 Driver Separate Alias(u)
270 Driver Joined Alias(u)
273 Common Driver Var(help_flag)
274 Display this information
277 Common Driver Report Joined
278 --help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params
281 Driver Separate Alias(x)
284 Driver Joined Alias(x)
287 Driver Separate Alias(L)
290 Driver Joined Alias(L)
292 -no-canonical-prefixes
293 Driver Alias(no-canonical-prefixes)
295 -no-standard-libraries
296 Driver Alias(nostdlib)
299 Driver Var(no_sysroot_suffix)
308 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
311 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
314 Driver Alias(pass-exit-codes)
317 Common Alias(Wpedantic)
320 Common Alias(pedantic-errors)
329 Driver Separate Alias(B)
332 Driver JoinedOrMissing Alias(B)
338 Driver Separate Alias(print-file-name=)
341 Driver JoinedOrMissing Alias(print-file-name=)
343 -print-libgcc-file-name
344 Driver Alias(print-libgcc-file-name)
346 -print-multi-directory
347 Driver Alias(print-multi-directory)
350 Driver Alias(print-multi-lib)
352 -print-multi-os-directory
353 Driver Alias(print-multi-os-directory)
356 Driver Alias(print-multiarch)
359 Driver Separate Alias(print-prog-name=)
362 Driver JoinedOrMissing Alias(print-prog-name=)
365 Driver Alias(print-search-dirs)
368 Driver Alias(print-sysroot)
370 -print-sysroot-headers-suffix
371 Driver Alias(print-sysroot-headers-suffix)
377 Driver Alias(save-temps)
383 Driver Separate Alias(specs=)
386 Driver Joined Alias(specs=)
392 Driver Alias(symbolic)
396 Alias for --help=target
404 ;; The driver used to convert options such as --help into forms such
405 ;; as -fhelp; the following four entries are for compatibility with
406 ;; any direct uses of those (undocumented) -f forms
408 Common Driver Alias(-help)
411 Common Driver Joined Alias(-help=)
414 Common Driver Alias(-target-help)
417 Common Driver Alias(-version)
421 --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
424 Common Joined Alias(-param)
427 Driver Separate Alias(-sysroot=)
430 Driver JoinedOrMissing
436 Driver Joined Separate
442 Driver Joined Separate
448 Common JoinedOrMissing Optimization
449 -O<number> Set optimization level to <number>
453 Optimize for space rather than speed
457 Optimize for speed disregarding exact standards compliance
461 Optimize for debugging experience rather than speed or size
473 Driver Joined Separate
479 Driver Joined Separate
500 Common RejectNegative Warning Alias(Wextra)
501 This switch is deprecated; use -Wextra instead
504 Driver JoinedOrMissing
507 Driver JoinedOrMissing
510 Driver JoinedOrMissing
513 Common Var(warn_aggregate_return) Warning
514 Warn about returning structures, unions or arrays
516 Waggressive-loop-optimizations
517 Common Var(warn_aggressive_loop_optimizations) Init(1) Warning
518 Warn if a loop with constant number of iterations triggers undefined behavior
521 Common Var(warn_array_bounds) Warning
522 Warn if an array is accessed out of bounds
525 Common Var(warn_attributes) Init(1) Warning
526 Warn about inappropriate attribute usage
529 Common Var(warn_cast_align) Warning
530 Warn about pointer casts which increase alignment
533 Common Var(warn_cpp) Init(1) Warning
534 Warn when a #warning directive is encountered
536 Wdeprecated-declarations
537 Common Var(warn_deprecated_decl) Init(1) Warning
538 Warn about uses of __attribute__((deprecated)) declarations
540 Wdisabled-optimization
541 Common Var(warn_disabled_optimization) Warning
542 Warn when an optimization pass is disabled
545 Common Var(warnings_are_errors)
546 Treat all warnings as errors
550 Treat specified warning as error
553 Common Var(extra_warnings) Warning
554 Print extra (possibly unwanted) warnings
557 Common Var(flag_fatal_errors)
558 Exit on the first error occurred
561 Common RejectNegative Joined UInteger
562 -Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
565 Common Var(warn_free_nonheap_object) Init(1) Warning
566 Warn when attempting to free a non-heap object
569 Common Var(warn_inline) Warning
570 Warn when an inlined function cannot be inlined
572 Winvalid-memory-model
573 Common Var(warn_invalid_memory_model) Init(1) Warning
574 Warn when an atomic memory model parameter is known to be outside the valid range.
577 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
580 Common RejectNegative Joined UInteger Warning
581 -Wlarger-than=<number> Warn if an object is larger than <number> bytes
583 Wunsafe-loop-optimizations
584 Common Var(warn_unsafe_loop_optimizations) Warning
585 Warn if the loop cannot be optimized due to nontrivial assumptions.
588 Common Alias(Wsuggest-attribute=noreturn)
591 Common Var(warn_overflow) Init(1) Warning
592 Warn about overflow in arithmetic expressions
595 Common Var(warn_packed) Warning
596 Warn when the packed attribute has no effect on struct layout
599 Common Var(warn_padded) Warning
600 Warn when padding is required to align structure members
603 Common Var(pedantic) Warning
604 Issue warnings needed for strict compliance to the standard
607 Common Var(warn_shadow) Warning
608 Warn when one local variable shadows another
611 Common Var(warn_stack_protect) Warning
612 Warn when not issuing stack smashing protection for some reason
615 Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
616 Warn if stack usage might be larger than specified amount
620 Warn about code which might break strict aliasing rules
623 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
624 Warn about code which might break strict aliasing rules
628 Warn about optimizations that assume that signed overflow is undefined
631 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
632 Warn about optimizations that assume that signed overflow is undefined
634 Wsuggest-attribute=const
635 Common Var(warn_suggest_attribute_const) Warning
636 Warn about functions which might be candidates for __attribute__((const))
638 Wsuggest-attribute=pure
639 Common Var(warn_suggest_attribute_pure) Warning
640 Warn about functions which might be candidates for __attribute__((pure))
642 Wsuggest-attribute=noreturn
643 Common Var(warn_suggest_attribute_noreturn) Warning
644 Warn about functions which might be candidates for __attribute__((noreturn))
647 Common Var(warn_system_headers) Warning
648 Do not suppress warnings from system headers
651 Common Var(warn_trampolines) Warning
652 Warn whenever a trampoline is generated
655 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
656 Warn if a comparison is always true or always false due to the limited range of the data type
659 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
660 Warn about uninitialized automatic variables
663 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
664 Warn about maybe uninitialized automatic variables
668 Does nothing. Preserved for backward compatibility.
671 Common Var(warn_unused) Init(0) Warning
672 Enable all -Wunused- warnings
674 Wunused-but-set-parameter
675 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
676 Warn when a function parameter is only set, otherwise unused
678 Wunused-but-set-variable
679 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
680 Warn when a variable is only set, otherwise unused
683 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
684 Warn when a function is unused
687 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
688 Warn when a label is unused
691 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
692 Warn when a function parameter is unused
695 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
696 Warn when an expression value is unused
699 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
700 Warn when a variable is unused
703 Common Var(warn_coverage_mismatch) Init(1) Warning
704 Warn in case profiles in -fprofile-use do not match
706 Wvector-operation-performance
707 Common Var(warn_vector_operation_performance) Warning
708 Warn when a vector operation is compiled outside the SIMD
723 Common Separate Var(aux_info_file_name)
724 -aux-info <file> Emit declaration information into <file>
727 Common Joined Alias(aux-info)
730 Common Separate RejectDriver Var(aux_base_name)
733 Common Separate RejectDriver
743 -d<letters> Enable dumps from specific passes of the compiler
746 Common Separate Var(dump_base_name)
747 -dumpbase <file> Set the file basename to be used for dumps
750 Common Separate Var(dump_dir_name)
751 -dumpdir <dir> Set the directory name to be used for dumps
763 Driver Joined Separate
765 ; This option has historically been passed down to the linker by an
766 ; accident of a %{e*} spec, so ensure it continues to be passed down
767 ; as a single option. The supported option for this purpose is
768 ; -rdynamic. See PR 47390.
772 ; The version of the C++ ABI in use. The following values are allowed:
774 ; 0: The version of the ABI believed most conformant with the C++ ABI
775 ; specification. This ABI may change as bugs are discovered and fixed.
776 ; Therefore, 0 will not necessarily indicate the same ABI in different
779 ; 1: The version of the ABI first used in G++ 3.2. No longer selectable.
781 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
783 ; 3: The version of the ABI that fixes the missing underscore
784 ; in template non-type arguments of pointer type.
786 ; 4: The version of the ABI that introduces unambiguous mangling of
787 ; vector types. First selectable in G++ 4.5.
789 ; 5: The version of the ABI that ignores attribute const/noreturn
790 ; in function pointer mangling, and corrects mangling of decltype and
791 ; function parameters used in other parameters and the return type.
792 ; First selectable in G++ 4.6.
794 ; 6: The version of the ABI that doesn't promote scoped enums to int and
795 ; changes the mangling of template argument packs, const/static_cast,
796 ; prefix ++ and --, and a class scope function used as a template
798 ; First selectable in G++ 4.7.
800 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
801 ; corrects the mangling of lambdas in default argument scope.
802 ; First selectable in G++ 4.8.
804 ; 8: The version of the ABI that corrects the substitution behavior of
805 ; function types with function-cv-qualifiers.
806 ; First selectable in G++ 4.9.
808 ; Additional positive integers will be assigned as new versions of
809 ; the ABI become the default version of the ABI.
811 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(0)
812 The version of the C++ ABI in use
814 faggressive-loop-optimizations
815 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
816 Aggressively optimize loops using language constraints
819 Common Report Var(align_functions,0) Optimization UInteger
820 Align the start of functions
823 Common RejectNegative Joined UInteger Var(align_functions)
826 Common Report Var(align_jumps,0) Optimization UInteger
827 Align labels which are only reached by jumping
830 Common RejectNegative Joined UInteger Var(align_jumps)
833 Common Report Var(align_labels,0) Optimization UInteger
837 Common RejectNegative Joined UInteger Var(align_labels)
840 Common Report Var(align_loops,0) Optimization UInteger
841 Align the start of loops
844 Common RejectNegative Joined UInteger Var(align_loops)
848 Does nothing. Preserved for backward compatibility.
852 Does nothing. Preserved for backward compatibility.
854 fargument-noalias-global
856 Does nothing. Preserved for backward compatibility.
858 fargument-noalias-anything
860 Does nothing. Preserved for backward compatibility.
863 Common Driver Report Joined
864 Select what to sanitize
867 Common Report Var(flag_sanitize_recover) Init(1)
868 After diagnosing undefined behavior attempt to continue execution
870 fsanitize-undefined-trap-on-error
871 Common Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
872 Use trap instead of a library function for undefined behavior sanitization
874 fasynchronous-unwind-tables
875 Common Report Var(flag_asynchronous_unwind_tables) Optimization
876 Generate unwind tables that are exact at each instruction boundary
879 Common Report Var(flag_auto_inc_dec) Init(1)
880 Generate auto-inc/dec instructions
882 ; -fcheck-bounds causes gcc to generate array bounds checks.
883 ; For C, C++ and ObjC: defaults off.
884 ; For Java: defaults to on.
885 ; For Fortran: defaults to off.
887 Common Report Var(flag_bounds_check)
888 Generate code to check bounds before indexing arrays
891 Common Report Var(flag_branch_on_count_reg) Optimization
892 Replace add, compare, branch with branch on count register
894 fbranch-probabilities
895 Common Report Var(flag_branch_probabilities) Optimization
896 Use profiling information for branch probabilities
898 fbranch-target-load-optimize
899 Common Report Var(flag_branch_target_load_optimize) Optimization
900 Perform branch target load optimization before prologue / epilogue threading
902 fbranch-target-load-optimize2
903 Common Report Var(flag_branch_target_load_optimize2) Optimization
904 Perform branch target load optimization after prologue / epilogue threading
907 Common Report Var(flag_btr_bb_exclusive) Optimization
908 Restrict target load migration not to re-use registers in any basic block
911 Common Joined RejectNegative Var(common_deferred_options) Defer
912 -fcall-saved-<register> Mark <register> as being preserved across functions
915 Common Joined RejectNegative Var(common_deferred_options) Defer
916 -fcall-used-<register> Mark <register> as being corrupted by function calls
918 ; Nonzero for -fcaller-saves: allocate values in regs that need to
919 ; be saved across function calls, if that produces overall better code.
920 ; Optional now, so people can test it.
922 Common Report Var(flag_caller_saves) Optimization
923 Save registers around function calls
926 Common Report Var(flag_check_data_deps)
927 Compare the results of several data dependence analyzers.
930 Common Var(flag_check_new)
931 Check the return value of new in C++
933 fcombine-stack-adjustments
934 Common Report Var(flag_combine_stack_adjustments) Optimization
935 Looks for opportunities to reduce stack adjustments and stack references.
938 Common Report Var(flag_no_common,0) Optimization
939 Do not put uninitialized globals in the common section
943 ; Converted by the driver to -fcompare-debug= options.
946 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
947 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
949 fcompare-debug-second
950 Common Driver RejectNegative Var(flag_compare_debug)
951 Run only the second compilation of -fcompare-debug
954 Common Report Var(flag_compare_elim_after_reload) Optimization
955 Perform comparison elimination after register allocation has finished
958 Common Var(flag_conserve_stack) Optimization
959 Do not perform optimizations increasing noticeably stack usage
962 Common Report Var(flag_cprop_registers) Optimization
963 Perform a register copy-propagation optimization pass
966 Common Report Var(flag_crossjumping) Optimization
967 Perform cross-jumping optimization
970 Common Report Var(flag_cse_follow_jumps) Optimization
971 When running CSE, follow jumps to their targets
975 Does nothing. Preserved for backward compatibility.
978 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
979 Omit range reduction step when performing complex division
982 Common Report Var(flag_cx_fortran_rules) Optimization
983 Complex multiplication and division follow Fortran rules
986 Common Report Var(flag_data_sections) Optimization
987 Place data items into their own section
990 Common Report Var(common_deferred_options) Defer
991 List all available debugging counters with their limits and counts.
994 Common RejectNegative Joined Var(common_deferred_options) Defer
995 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
998 Common Joined RejectNegative Var(common_deferred_options) Defer
999 Map one directory name to another in debug information
1001 fdebug-types-section
1002 Common Report Var(flag_debug_types_section) Init(0)
1003 Output .debug_types section when using DWARF v4 debuginfo.
1005 ; Nonzero for -fdefer-pop: don't pop args after each function call
1006 ; instead save them up to pop many calls' args with one insns.
1008 Common Report Var(flag_defer_pop) Optimization
1009 Defer popping functions args from stack until later
1012 Common Report Var(flag_delayed_branch) Optimization
1013 Attempt to fill delay slots of branch instructions
1015 fdelete-dead-exceptions
1016 Common Report Var(flag_delete_dead_exceptions) Init(0)
1017 Delete dead instructions that may throw exceptions
1019 fdelete-null-pointer-checks
1020 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
1021 Delete useless null pointer checks
1023 fdevirtualize-speculatively
1024 Common Report Var(flag_devirtualize_speculatively) Optimization
1025 Perform speculative devirtualization
1028 Common Report Var(flag_devirtualize) Optimization
1029 Try to convert virtual calls to direct ones.
1031 fdiagnostics-show-location=
1032 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1033 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
1035 ; Required for these enum values.
1040 Name(diagnostic_prefixing_rule) Type(int)
1043 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1046 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1048 fdiagnostics-show-caret
1049 Common Var(flag_diagnostics_show_caret) Init(1)
1050 Show the source line with a caret indicating the column
1053 Common Alias(fdiagnostics-color=,always,never)
1057 Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1058 -fdiagnostics-color=[never|always|auto] Colorize diagnostics
1060 ; Required for these enum values.
1065 Name(diagnostic_color_rule) Type(int)
1068 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1071 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1074 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1076 fdiagnostics-show-option
1077 Common Var(flag_diagnostics_show_option) Init(1)
1078 Amend appropriate diagnostic messages with the command line option that controls them
1081 Common Joined RejectNegative Var(common_deferred_options) Defer
1082 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1085 Common Joined RejectNegative Var(common_deferred_options) Defer
1086 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1089 Common Joined RejectNegative Var(common_deferred_options) Defer
1090 -fdump-<type> Dump various compiler internals to a file
1093 Driver RejectNegative
1096 Common RejectNegative Joined Var(flag_dump_final_insns)
1097 -fdump-final-insns=filename Dump to filename the insns at the end of translation
1100 Common RejectNegative Joined Var(flag_dump_go_spec)
1101 -fdump-go-spec=filename Write all declarations to file as Go code
1104 Common Report Var(flag_dump_noaddr)
1105 Suppress output of addresses in debugging dumps
1108 Common Var(flag_dump_passes) Init(0)
1109 Dump optimization passes
1112 Common Report Var(flag_dump_unnumbered)
1113 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1115 fdump-unnumbered-links
1116 Common Report Var(flag_dump_unnumbered_links)
1117 Suppress output of previous and next insn numbers in debugging dumps
1120 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1121 Enable CFI tables via GAS assembler directives.
1124 Common Report Var(flag_early_inlining) Init(1) Optimization
1125 Perform early inlining
1127 feliminate-dwarf2-dups
1128 Common Report Var(flag_eliminate_dwarf2_dups)
1129 Perform DWARF2 duplicate elimination
1132 Common Report Var(flag_ipa_sra) Init(0) Optimization
1133 Perform interprocedural reduction of aggregates
1135 feliminate-unused-debug-symbols
1136 Common Report Var(flag_debug_only_used_symbols)
1137 Perform unused type elimination in debug info
1139 feliminate-unused-debug-types
1140 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1141 Perform unused type elimination in debug info
1143 femit-class-debug-always
1144 Common Report Var(flag_emit_class_debug_always) Init(0)
1145 Do not suppress C++ class debug information.
1148 Common Report Var(flag_exceptions) Optimization
1149 Enable exception handling
1151 fexpensive-optimizations
1152 Common Report Var(flag_expensive_optimizations) Optimization
1153 Perform a number of minor, expensive optimizations
1156 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1157 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1160 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1163 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1166 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1172 Common Var(flag_fat_lto_objects)
1173 Output lto objects containing both the intermediate language and binary output.
1176 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1177 Assume no NaNs or infinities are generated
1180 Common Joined RejectNegative Var(common_deferred_options) Defer
1181 -ffixed-<register> Mark <register> as being unavailable to the compiler
1184 Common Report Var(flag_float_store) Optimization
1185 Don't allocate floats and doubles in extended-precision registers
1189 Does nothing. Preserved for backward compatibility.
1192 Common Report Var(flag_forward_propagate) Optimization
1193 Perform a forward propagation pass on RTL
1196 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1197 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1200 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1203 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1205 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1207 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1210 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1212 ; Nonzero means don't put addresses of constant functions in registers.
1213 ; Used for compiling the Unix kernel, where strange substitutions are
1214 ; done on the assembly output.
1216 Common Report Var(flag_no_function_cse,0)
1217 Allow function addresses to be held in registers
1220 Common Report Var(flag_function_sections)
1221 Place each function into its own section
1224 Common Report Var(flag_gcse) Optimization
1225 Perform global common subexpression elimination
1228 Common Report Var(flag_gcse_lm) Init(1) Optimization
1229 Perform enhanced load motion during global common subexpression elimination
1232 Common Report Var(flag_gcse_sm) Init(0) Optimization
1233 Perform store motion after global common subexpression elimination
1236 Common Report Var(flag_gcse_las) Init(0) Optimization
1237 Perform redundant load after store elimination in global common subexpression
1241 Common Report Var(flag_gcse_after_reload) Optimization
1242 Perform global common subexpression elimination after register allocation
1245 ; This option is not documented yet as its semantics will change.
1247 Common Report Var(flag_graphite)
1248 Enable in and out of Graphite representation
1251 Common Report Var(flag_graphite_identity) Optimization
1252 Enable Graphite Identity transformation
1254 fgraphite-code-generator=
1255 Common Report RejectNegative Joined Optimization Enum(fgraphite_generator) Var(flag_graphite_code_gen) Init(FGRAPHITE_CODE_GEN_CLOOG)
1256 Choose code generator of Graphite
1259 Name(fgraphite_generator) Type(enum fgraphite_generator) UnknownError(unknown code generator of graphite %qs)
1262 Enum(fgraphite_generator) String(isl) Value(FGRAPHITE_CODE_GEN_ISL)
1265 Enum(fgraphite_generator) String(cloog) Value(FGRAPHITE_CODE_GEN_CLOOG)
1267 fhoist-adjacent-loads
1268 Common Report Var(flag_hoist_adjacent_loads) Optimization
1269 Enable hoisting adjacent loads to encourage generating conditional move
1272 floop-parallelize-all
1273 Common Report Var(flag_loop_parallelize_all) Optimization
1274 Mark all loops as parallel
1277 Common Report Var(flag_loop_strip_mine) Optimization
1278 Enable Loop Strip Mining transformation
1281 Common Report Var(flag_loop_interchange) Optimization
1282 Enable Loop Interchange transformation
1285 Common Report Var(flag_loop_block) Optimization
1286 Enable Loop Blocking transformation
1289 Common Report Var(flag_tm)
1290 Enable support for GNU transactional memory
1293 Common Report Var(flag_gnu_unique) Init(1)
1294 Use STB_GNU_UNIQUE if supported by the assembler
1298 Does nothing. Preserved for backward compatibility.
1301 Common Report Var(flag_loop_optimize_isl) Optimization
1302 Enable the ISL based loop nest optimizer
1304 fstrict-volatile-bitfields
1305 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1306 Force bitfield accesses to match their type width
1308 fguess-branch-probability
1309 Common Report Var(flag_guess_branch_prob) Optimization
1310 Enable guessing of branch probabilities
1312 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1313 ; Generate position-independent code for executables if possible
1314 ; On SVR4 targets, it also controls whether or not to emit a
1315 ; string identifying the compiler.
1317 Common Report Var(flag_no_ident,0)
1318 Process #ident directives
1321 Common Report Var(flag_if_conversion) Optimization
1322 Perform conversion of conditional jumps to branchless equivalents
1325 Common Report Var(flag_if_conversion2) Optimization
1326 Perform conversion of conditional jumps to conditional execution
1329 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1330 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1333 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1336 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1339 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1342 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1344 ftree-loop-if-convert
1345 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1346 Convert conditional jumps in innermost loops to branchless equivalents
1348 ftree-loop-if-convert-stores
1349 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1350 Also if-convert conditional jumps containing memory writes
1352 ; -finhibit-size-directive inhibits output of .size for ELF.
1353 ; This is used only for compiling crtstuff.c,
1354 ; and it may be extended to other effects
1355 ; needed for crtstuff.c on other systems.
1356 finhibit-size-directive
1357 Common Report Var(flag_inhibit_size_directive)
1358 Do not generate .size directives
1361 Common Report Var(flag_indirect_inlining)
1362 Perform indirect inlining
1364 ; General flag to enable inlining. Specifying -fno-inline will disable
1365 ; all inlining apart from always-inline functions.
1367 Common Report Var(flag_no_inline,0) Init(0) Optimization
1368 Enable inlining of function declared \"inline\", disabling disables all inlining
1370 finline-small-functions
1371 Common Report Var(flag_inline_small_functions) Optimization
1372 Integrate functions into their callers when code size is known not to grow
1375 Common Report Var(flag_inline_functions) Optimization
1376 Integrate functions not declared \"inline\" into their callers when profitable
1378 finline-functions-called-once
1379 Common Report Var(flag_inline_functions_called_once) Optimization
1380 Integrate functions only required by their single caller
1383 Common RejectNegative Joined Alias(finline-limit=)
1386 Common RejectNegative Joined UInteger
1387 -finline-limit=<number> Limit the size of inlined functions to <number>
1390 Common Report Var(flag_inline_atomics) Init(1) Optimization
1391 Inline __atomic operations when a lock free instruction sequence is available.
1393 finstrument-functions
1394 Common Report Var(flag_instrument_function_entry_exit)
1395 Instrument function entry and exit with profiling calls
1397 finstrument-functions-exclude-function-list=
1398 Common RejectNegative Joined
1399 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1401 finstrument-functions-exclude-file-list=
1402 Common RejectNegative Joined
1403 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1406 Common Report Var(flag_ipa_cp) Optimization
1407 Perform interprocedural constant propagation
1410 Common Report Var(flag_ipa_cp_clone) Optimization
1411 Perform cloning to make Interprocedural constant propagation stronger
1414 Common Report Var(flag_ipa_profile) Init(0) Optimization
1415 Perform interprocedural profile propagation
1418 Common Report Var(flag_ipa_pta) Init(0) Optimization
1419 Perform interprocedural points-to analysis
1422 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1423 Discover pure and const functions
1426 Common Report Var(flag_ipa_reference) Init(0) Optimization
1427 Discover readonly and non addressable static variables
1431 Does nothing. Preserved for backward compatibility.
1435 Does nothing. Preserved for backward compatibility.
1438 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1439 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1442 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1445 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1448 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1451 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1452 -fira-region=[one|all|mixed] Set regions for IRA
1455 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1458 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1461 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1464 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1467 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1468 Use IRA based register pressure calculation
1469 in RTL hoist optimizations.
1472 Common Report Var(flag_ira_loop_pressure) Optimization
1473 Use IRA based register pressure calculation
1474 in RTL loop optimizations.
1476 fira-share-save-slots
1477 Common Report Var(flag_ira_share_save_slots) Init(1)
1478 Share slots for saving different hard registers.
1480 fira-share-spill-slots
1481 Common Report Var(flag_ira_share_spill_slots) Init(1)
1482 Share stack slots for spilled pseudo-registers.
1485 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1486 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1489 Common Report Var(flag_ivopts) Init(1) Optimization
1490 Optimize induction variables on trees
1493 Common Var(flag_jump_tables) Init(1) Optimization
1494 Use jump tables for sufficiently large switch statements
1496 fkeep-inline-functions
1497 Common Report Var(flag_keep_inline_functions)
1498 Generate code for functions even if they are fully inlined
1501 Common Report Var(flag_keep_static_consts) Init(1)
1502 Emit static const variables even if they are not used
1505 Common Report Var(flag_leading_underscore) Init(-1)
1506 Give external symbols a leading underscore
1510 Does nothing. Preserved for backward compatibility.
1514 Enable link-time optimization.
1517 Common RejectNegative Joined Var(flag_lto)
1518 Link-time optimization with number of parallel jobs or jobserver.
1521 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1524 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1527 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1530 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1533 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1536 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1539 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1540 Specify the algorithm to partition symbols and vars at linktime
1542 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1543 flto-compression-level=
1544 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1545 -flto-compression-level=<number> Use zlib compression level <number> for IL
1548 Common Report Var(flag_lto_report) Init(0)
1549 Report various link-time optimization statistics
1552 Common Report Var(flag_lto_report_wpa) Init(0)
1553 Report various link-time optimization statistics for WPA only
1556 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1557 Set errno after built-in math functions
1560 Common Joined RejectNegative UInteger Var(flag_max_errors)
1561 -fmax-errors=<number> Maximum number of errors to report
1564 Common Report Var(mem_report)
1565 Report on permanent memory allocation
1568 Common Report Var(mem_report_wpa)
1569 Report on permanent memory allocation in WPA only
1571 ; This will attempt to merge constant section constants, if 1 only
1572 ; string constants and constants from constant pool, if 2 also constant
1574 fmerge-all-constants
1575 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1576 Attempt to merge identical constants and constant variables
1579 Common Report Var(flag_merge_constants,1) Optimization
1580 Attempt to merge identical constants across compilation units
1582 fmerge-debug-strings
1583 Common Report Var(flag_merge_debug_strings) Init(1)
1584 Attempt to merge identical debug strings across compilation units
1587 Common RejectNegative Joined UInteger
1588 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1591 Common Report Var(flag_modulo_sched) Optimization
1592 Perform SMS based modulo scheduling before the first scheduling pass
1594 fmodulo-sched-allow-regmoves
1595 Common Report Var(flag_modulo_sched_allow_regmoves)
1596 Perform SMS based modulo scheduling with register moves allowed
1598 fmove-loop-invariants
1599 Common Report Var(flag_move_loop_invariants) Optimization
1600 Move loop invariant computations out of loops
1603 Common Var(flag_dce) Init(1) Optimization
1604 Use the RTL dead code elimination pass
1607 Common Var(flag_dse) Init(1) Optimization
1608 Use the RTL dead store elimination pass
1610 freschedule-modulo-scheduled-loops
1611 Common Report Var(flag_resched_modulo_sched) Optimization
1612 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1614 fnon-call-exceptions
1615 Common Report Var(flag_non_call_exceptions) Optimization
1616 Support synchronous non-call exceptions
1619 Common Report Var(flag_omit_frame_pointer) Optimization
1620 When possible do not generate stack frames
1623 Common Report Var(flag_opt_info) Optimization
1624 Enable all optimization info dumps on stderr
1627 Common Joined RejectNegative Var(common_deferred_options) Defer
1628 -fopt-info[-<type>=filename] Dump compiler optimization details
1630 foptimize-register-move
1632 Does nothing. Preserved for backward compatibility.
1634 foptimize-sibling-calls
1635 Common Report Var(flag_optimize_sibling_calls) Optimization
1636 Optimize sibling and tail recursive calls
1639 Common Report Var(flag_partial_inlining)
1640 Perform partial inlining
1643 Common Report Var(pre_ipa_mem_report)
1644 Report on memory allocation before interprocedural optimization
1646 fpost-ipa-mem-report
1647 Common Report Var(post_ipa_mem_report)
1648 Report on memory allocation before interprocedural optimization
1651 Common Report Var(flag_pack_struct) Optimization
1652 Pack structure members together without holes
1655 Common RejectNegative Joined UInteger Optimization
1656 -fpack-struct=<number> Set initial maximum structure member alignment
1659 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1660 Return small aggregates in memory, not registers
1663 Common Report Var(flag_peel_loops) Optimization
1664 Perform loop peeling
1667 Common Report Var(flag_no_peephole,0) Optimization
1668 Enable machine specific peephole optimizations
1671 Common Report Var(flag_peephole2) Optimization
1672 Enable an RTL peephole pass before sched2
1675 Common Report Var(flag_pic,2) Negative(fPIE)
1676 Generate position-independent code if possible (large mode)
1679 Common Report Var(flag_pie,2) Negative(fpic)
1680 Generate position-independent code for executables if possible (large mode)
1683 Common Report Var(flag_pic,1) Negative(fpie)
1684 Generate position-independent code if possible (small mode)
1687 Common Report Var(flag_pie,1) Negative(fPIC)
1688 Generate position-independent code for executables if possible (small mode)
1691 Common Joined RejectNegative Var(common_deferred_options) Defer
1692 Specify a plugin to load
1695 Common Joined RejectNegative Var(common_deferred_options) Defer
1696 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1698 fpredictive-commoning
1699 Common Report Var(flag_predictive_commoning) Optimization
1700 Run predictive commoning optimization.
1702 fprefetch-loop-arrays
1703 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1704 Generate prefetch instructions, if available, for arrays in loops
1707 Common Report Var(profile_flag)
1708 Enable basic program profiling code
1711 Common Report Var(profile_arc_flag)
1712 Insert arc-based program profiling code
1715 Common Joined RejectNegative Var(profile_data_prefix)
1716 Set the top-level directory for storing the profile data.
1717 The default is 'pwd'.
1720 Common Report Var(flag_profile_correction)
1721 Enable correction of flow inconsistent profile data input
1725 Enable common options for generating profile info for profile feedback directed optimizations
1728 Common Joined RejectNegative
1729 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1732 Common Var(flag_profile_use)
1733 Enable common options for performing profile feedback directed optimizations
1736 Common Joined RejectNegative
1737 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1740 Common Report Var(flag_profile_values)
1741 Insert code to profile values of expressions
1744 Common Report Var(profile_report)
1745 Report on consistency of profile
1747 fprofile-reorder-functions
1748 Common Report Var(flag_profile_reorder_functions)
1749 Enable function reordering that improves code placement
1752 Common Var(common_deferred_options) Defer
1755 Common Joined RejectNegative Var(common_deferred_options) Defer
1756 -frandom-seed=<string> Make compile reproducible using <string>
1758 ; This switch causes the command line that was used to create an
1759 ; object file to be recorded into the object file. The exact format
1760 ; of this recording is target and binary file format dependent.
1761 ; It is related to the -fverbose-asm switch, but that switch only
1762 ; records information in the assembler output file as comments, so
1763 ; they never reach the object file.
1764 frecord-gcc-switches
1765 Common Report Var(flag_record_gcc_switches)
1766 Record gcc command line switches in the object file.
1769 Common Report Var(flag_pcc_struct_return,0) Optimization
1770 Return small aggregates in registers
1774 Does nothing. Preserved for backward compatibility.
1776 flive-range-shrinkage
1777 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
1778 Relief of register pressure through live range shrinkage
1781 Common Report Var(flag_rename_registers) Init(2) Optimization
1782 Perform a register renaming optimization pass
1785 Common Report Var(flag_reorder_blocks) Optimization
1786 Reorder basic blocks to improve code placement
1788 freorder-blocks-and-partition
1789 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1790 Reorder basic blocks and partition into hot and cold sections
1793 Common Report Var(flag_reorder_functions) Optimization
1794 Reorder functions to improve code placement
1796 frerun-cse-after-loop
1797 Common Report Var(flag_rerun_cse_after_loop) Optimization
1798 Add a common subexpression elimination pass after loop optimizations
1802 Does nothing. Preserved for backward compatibility.
1805 Common Report Var(flag_rounding_math) Optimization SetByCombined
1806 Disable optimizations that assume default FP rounding behavior
1809 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1810 Enable scheduling across basic blocks
1813 Common Report Var(flag_sched_pressure) Init(0) Optimization
1814 Enable register pressure sensitive insn scheduling
1817 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1818 Allow speculative motion of non-loads
1821 Common Report Var(flag_schedule_speculative_load) Optimization
1822 Allow speculative motion of some loads
1824 fsched-spec-load-dangerous
1825 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1826 Allow speculative motion of more loads
1829 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1830 -fsched-verbose=<number> Set the verbosity level of the scheduler
1832 fsched2-use-superblocks
1833 Common Report Var(flag_sched2_use_superblocks) Optimization
1834 If scheduling post reload, do superblock scheduling
1838 Does nothing. Preserved for backward compatibility.
1841 Common Report Var(flag_schedule_insns) Optimization
1842 Reschedule instructions before register allocation
1845 Common Report Var(flag_schedule_insns_after_reload) Optimization
1846 Reschedule instructions after register allocation
1848 ; This flag should be on when a target implements non-trivial
1849 ; scheduling hooks, maybe saving some information for its own sake.
1850 ; On IA64, for example, this is used for correct bundling.
1851 fselective-scheduling
1852 Common Report Var(flag_selective_scheduling) Optimization
1853 Schedule instructions using selective scheduling algorithm
1855 fselective-scheduling2
1856 Common Report Var(flag_selective_scheduling2) Optimization
1857 Run selective scheduling after reload
1859 fsel-sched-pipelining
1860 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1861 Perform software pipelining of inner loops during selective scheduling
1863 fsel-sched-pipelining-outer-loops
1864 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1865 Perform software pipelining of outer loops during selective scheduling
1867 fsel-sched-reschedule-pipelined
1868 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1869 Reschedule pipelined regions without pipelining
1871 fsemantic-interposition
1872 Common Report Var(flag_semantic_interposition) Init(1)
1873 Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker
1875 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1876 ; of stalled insns into the ready list.
1877 fsched-stalled-insns
1878 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1879 Allow premature scheduling of queued insns
1881 fsched-stalled-insns=
1882 Common RejectNegative Joined UInteger
1883 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1885 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1886 ; be examined for a dependency on a stalled insn that is candidate for
1887 ; premature removal from the queue of stalled insns into the ready list (has
1888 ; an effect only if the flag 'sched_stalled_insns' is set).
1889 fsched-stalled-insns-dep
1890 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1891 Set dependence distance checking in premature scheduling of queued insns
1893 fsched-stalled-insns-dep=
1894 Common RejectNegative Joined UInteger
1895 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1897 fsched-group-heuristic
1898 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1899 Enable the group heuristic in the scheduler
1901 fsched-critical-path-heuristic
1902 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1903 Enable the critical path heuristic in the scheduler
1905 fsched-spec-insn-heuristic
1906 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1907 Enable the speculative instruction heuristic in the scheduler
1909 fsched-rank-heuristic
1910 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1911 Enable the rank heuristic in the scheduler
1913 fsched-last-insn-heuristic
1914 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1915 Enable the last instruction heuristic in the scheduler
1917 fsched-dep-count-heuristic
1918 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1919 Enable the dependent count heuristic in the scheduler
1922 Common Report Var(flag_section_anchors) Optimization
1923 Access data in the same section from shared anchor points
1927 Does nothing. Preserved for backward compatibility.
1931 Does nothing. Preserved for backward compatibility.
1934 Common Report Var(flag_ree) Init(0)
1935 Turn on Redundant Extensions Elimination pass.
1938 Common Report Var(flag_show_column) Init(1)
1939 Show column numbers in diagnostics, when available. Default on
1942 Common Report Var(flag_shrink_wrap) Optimization
1943 Emit function prologues only before parts of the function that need it,
1944 rather than at the top of the function.
1947 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1948 Disable optimizations observable by IEEE signaling NaNs
1951 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1952 Disable floating point optimizations that ignore the IEEE signedness of zero
1954 fsingle-precision-constant
1955 Common Report Var(flag_single_precision_constant) Optimization
1956 Convert floating point constants to single precision constants
1958 fsplit-ivs-in-unroller
1959 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1960 Split lifetimes of induction variables when loops are unrolled
1963 Common Report Var(flag_split_stack) Init(-1)
1964 Generate discontiguous stack frames
1967 Common Report Var(flag_split_wide_types) Optimization
1968 Split wide types into independent registers
1971 Common Report Var(flag_ssa_phiopt) Optimization
1972 Optimize conditional patterns using SSA PHI nodes
1974 fvariable-expansion-in-unroller
1975 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1976 Apply variable expansion when loops are unrolled
1979 Common Report RejectNegative Joined
1980 -fstack-check=[no|generic|specific] Insert stack checking code into the program
1983 Common Alias(fstack-check=, specific, no)
1984 Insert stack checking code into the program. Same as -fstack-check=specific
1987 Common Var(common_deferred_options) Defer
1989 fstack-limit-register=
1990 Common RejectNegative Joined Var(common_deferred_options) Defer
1991 -fstack-limit-register=<register> Trap if the stack goes past <register>
1993 fstack-limit-symbol=
1994 Common RejectNegative Joined Var(common_deferred_options) Defer
1995 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
1998 Common Report Var(flag_stack_protect, 1)
1999 Use propolice as a stack protection method
2001 fstack-protector-all
2002 Common Report RejectNegative Var(flag_stack_protect, 2)
2003 Use a stack protection method for every function
2005 fstack-protector-strong
2006 Common Report RejectNegative Var(flag_stack_protect, 3)
2007 Use a smart stack protection method for certain functions
2010 Common RejectNegative Var(flag_stack_usage)
2011 Output stack usage information on a per-function basis
2015 Does nothing. Preserved for backward compatibility.
2017 ; Nonzero if we should do (language-dependent) alias analysis.
2018 ; Typically, this analysis will assume that expressions of certain
2019 ; types do not alias expressions of certain other types. Only used
2020 ; if alias analysis (in general) is enabled.
2022 Common Report Var(flag_strict_aliasing) Optimization
2023 Assume strict aliasing rules apply
2026 Common Report Var(flag_strict_overflow)
2027 Treat signed overflow as undefined
2030 Common Report Var(flag_sync_libcalls) Init(1)
2031 Implement __atomic operations via libcalls to legacy __sync functions
2034 Common Report Var(flag_syntax_only)
2035 Check for syntax errors, then stop
2038 Common Report Var(flag_test_coverage)
2039 Create data files needed by \"gcov\"
2042 Common Report Var(flag_thread_jumps) Optimization
2043 Perform jump threading optimizations
2046 Common Report Var(time_report)
2047 Report the time taken by each compiler pass
2050 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2051 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
2054 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2057 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2060 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2063 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2066 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2069 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
2070 Reorder top level functions, variables, and asms
2073 Common Report Var(flag_tracer)
2074 Perform superblock formation via tail duplication
2076 ; Zero means that floating-point math operations cannot generate a
2077 ; (user-visible) trap. This is the case, for example, in nonstop
2078 ; IEEE 754 arithmetic.
2080 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2081 Assume floating-point operations can trap
2084 Common Report Var(flag_trapv) Optimization
2085 Trap for signed overflow in addition, subtraction and multiplication
2088 Common Report Var(flag_tree_ccp) Optimization
2089 Enable SSA-CCP optimization on trees
2092 Common Report Var(flag_tree_bit_ccp) Optimization
2093 Enable SSA-BIT-CCP optimization on trees
2097 Does nothing. Preserved for backward compatibility.
2100 Common Report Var(flag_tree_ch) Optimization
2101 Enable loop header copying on trees
2103 ftree-coalesce-inlined-vars
2104 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2105 Enable coalescing of copy-related user variables that are inlined
2108 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2109 Enable coalescing of all copy-related user variables
2112 Common Report Var(flag_tree_copyrename) Optimization
2113 Replace SSA temporaries with better names in copies
2116 Common Report Var(flag_tree_copy_prop) Optimization
2117 Enable copy propagation on trees
2119 ftree-store-copy-prop
2121 Does nothing. Preserved for backward compatibility.
2124 Common Report Var(flag_tree_cselim) Init(2) Optimization
2125 Transform condition stores into unconditional ones
2127 ftree-switch-conversion
2128 Common Report Var(flag_tree_switch_conversion) Optimization
2129 Perform conversions of switch initializations.
2132 Common Report Var(flag_tree_dce) Optimization
2133 Enable SSA dead code elimination optimization on trees
2135 ftree-dominator-opts
2136 Common Report Var(flag_tree_dom) Optimization
2137 Enable dominator optimizations
2140 Common Report Var(flag_tree_tail_merge) Optimization
2141 Enable tail merging on trees
2144 Common Report Var(flag_tree_dse) Optimization
2145 Enable dead store elimination
2148 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2149 Enable forward propagation on trees
2152 Common Report Var(flag_tree_fre) Optimization
2153 Enable Full Redundancy Elimination (FRE) on trees
2156 Common Report Var(flag_optimize_strlen) Optimization
2157 Enable string length optimizations on trees
2159 fisolate-erroneous-paths-dereference
2160 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2161 Detect paths which trigger erroneous or undefined behaviour due to
2162 dereferencing a NULL pointer. Isolate those paths from the main control
2163 flow and turn the statement with erroneous or undefined behaviour into a trap.
2165 fisolate-erroneous-paths-attribute
2166 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2167 Detect paths which trigger erroneous or undefined behaviour due a NULL value
2168 being used in a way which is forbidden by a returns_nonnull or nonnull
2169 attribute. Isolate those paths from the main control flow and turn the
2170 statement with erroneous or undefined behaviour into a trap.
2172 ftree-loop-distribution
2173 Common Report Var(flag_tree_loop_distribution) Optimization
2174 Enable loop distribution on trees
2176 ftree-loop-distribute-patterns
2177 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2178 Enable loop distribution for patterns transformed into a library call
2181 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2182 Enable loop invariant motion on trees
2185 Common Alias(floop-interchange)
2186 Enable loop interchange transforms. Same as -floop-interchange
2189 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2190 Create canonical induction variables in loops
2193 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2194 Enable loop optimizations on tree level
2196 ftree-parallelize-loops=
2197 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2198 Enable automatic parallelization of loops
2201 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2202 Enable hoisting loads from conditional pointers.
2205 Common Report Var(flag_tree_pre) Optimization
2206 Enable SSA-PRE optimization on trees
2209 Common Report Var(flag_tree_partial_pre) Optimization
2210 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2213 Common Report Var(flag_tree_pta) Optimization
2214 Perform function-local points-to analysis on trees.
2217 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2218 Enable reassociation on tree level
2222 Does nothing. Preserved for backward compatibility.
2225 Common Report Var(flag_tree_sink) Optimization
2226 Enable SSA code sinking on trees
2229 Common Report Var(flag_tree_slsr) Optimization
2230 Perform straight-line strength reduction
2233 Common Report Var(flag_tree_sra) Optimization
2234 Perform scalar replacement of aggregates
2237 Common Report Var(flag_tree_ter) Optimization
2238 Replace temporary expressions in the SSA->normal pass
2241 Common Report Var(flag_tree_live_range_split) Optimization
2242 Perform live range splitting during the SSA->normal pass
2245 Common Report Var(flag_tree_vrp) Init(0) Optimization
2246 Perform Value Range Propagation on trees
2249 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2250 Compile whole compilation unit at a time
2253 Common Report Var(flag_unroll_loops) Optimization
2254 Perform loop unrolling when iteration count is known
2257 Common Report Var(flag_unroll_all_loops) Optimization
2258 Perform loop unrolling for all loops
2260 ; Nonzero means that loop optimizer may assume that the induction variables
2261 ; that control loops do not overflow and that the loops with nontrivial
2262 ; exit condition are not infinite
2263 funsafe-loop-optimizations
2264 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2265 Allow loop optimizations to assume that the loops behave in normal way
2268 Common Report Var(flag_associative_math) SetByCombined
2269 Allow optimization for floating-point arithmetic which may change the
2270 result of the operation due to rounding.
2273 Common Report Var(flag_reciprocal_math) SetByCombined
2274 Same as -fassociative-math for expressions which include division.
2276 ; Nonzero means that unsafe floating-point math optimizations are allowed
2277 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2278 ; are allowed to assume that their arguments and results are "normal"
2279 ; (e.g., nonnegative for SQRT).
2280 funsafe-math-optimizations
2281 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2282 Allow math optimizations that may violate IEEE or ISO standards
2285 Common Report Var(flag_unswitch_loops) Optimization
2286 Perform loop unswitching
2289 Common Report Var(flag_unwind_tables) Optimization
2290 Just generate unwind tables for exception handling
2293 Common Driver Negative(fuse-ld=gold)
2294 Use the bfd linker instead of the default linker
2297 Common Driver Negative(fuse-ld=bfd)
2298 Use the gold linker instead of the default linker
2301 Common Undocumented Var(flag_use_linker_plugin)
2303 ; Positive if we should track variables, negative if we should run
2304 ; the var-tracking pass only to discard debug annotations, zero if
2305 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2306 ; will be set according to optimize, debug_info_level and debug_hooks
2307 ; in process_options ().
2309 Common Report Var(flag_var_tracking) Init(2) Optimization
2310 Perform variable tracking
2312 ; Positive if we should track variables at assignments, negative if
2313 ; we should run the var-tracking pass only to discard debug
2314 ; annotations. When flag_var_tracking_assignments ==
2315 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2316 fvar-tracking-assignments
2317 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2318 Perform variable tracking by annotating assignments
2320 ; Nonzero if we should toggle flag_var_tracking_assignments after
2321 ; processing options and computing its default. */
2322 fvar-tracking-assignments-toggle
2323 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2324 Toggle -fvar-tracking-assignments
2326 ; Positive if we should track uninitialized variables, negative if
2327 ; we should run the var-tracking pass only to discard debug
2328 ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
2329 ; will be set according to flag_var_tracking.
2330 fvar-tracking-uninit
2331 Common Report Var(flag_var_tracking_uninit) Optimization
2332 Perform variable tracking and also tag variables that are uninitialized
2335 Common Report Var(flag_tree_vectorize) Optimization
2336 Enable vectorization on trees
2338 ftree-vectorizer-verbose=
2339 Common Joined RejectNegative Ignore
2340 Does nothing. Preserved for backward compatibility.
2342 ftree-loop-vectorize
2343 Common Report Var(flag_tree_loop_vectorize) Optimization
2344 Enable loop vectorization on trees
2347 Common Report Var(flag_tree_slp_vectorize) Optimization
2348 Enable basic block vectorization (SLP) on trees
2351 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT)
2352 Specifies the cost model for vectorization
2355 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED)
2356 Specifies the vectorization cost model for code marked with a simd directive
2359 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2362 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2365 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2368 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2371 Common RejectNegative Alias(fvect-cost-model=,dynamic)
2372 Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
2375 Common RejectNegative Alias(fvect-cost-model=,unlimited)
2376 Enables the unlimited vectorizer cost model. Preserved for backward compatibility.
2378 ftree-vect-loop-version
2380 Does nothing. Preserved for backward compatibility.
2383 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2384 Enable copy propagation of scalar-evolution information.
2386 ; -fverbose-asm causes extra commentary information to be produced in
2387 ; the generated assembly code (to make it more readable). This option
2388 ; is generally only of use to those who actually need to read the
2389 ; generated assembly code (perhaps while debugging the compiler itself).
2390 ; -fno-verbose-asm, the default, causes the extra information
2391 ; to not be added and is useful when comparing two assembler files.
2393 Common Report Var(flag_verbose_asm)
2394 Add extra commentary to assembler output
2397 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2398 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2401 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2404 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2407 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2410 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2413 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2416 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2417 Validate vtable pointers before using them.
2420 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2423 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2426 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2429 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2432 Common Var(flag_vtv_counts)
2433 Output vtable verification counters.
2436 Common Var(flag_vtv_debug)
2437 Output vtable verification pointer sets information.
2440 Common Report Var(flag_value_profile_transformations) Optimization
2441 Use expression value profiles in optimizations
2444 Common Report Var(flag_web) Init(2) Optimization
2445 Construct webs and split unrelated uses of single variable
2447 ftree-builtin-call-dce
2448 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2449 Enable conditional dead code elimination for builtin calls
2452 Common Report Var(flag_whole_program) Init(0) Optimization
2453 Perform whole program optimizations
2456 Common Report Var(flag_wrapv) Optimization
2457 Assume signed arithmetic overflow wraps around
2459 fzero-initialized-in-bss
2460 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2461 Put zero initialized data in the bss section
2464 Common JoinedOrMissing
2465 Generate debug information in default format
2468 Common JoinedOrMissing Negative(gdwarf)
2469 Generate debug information in COFF format
2472 Common JoinedOrMissing Negative(gdwarf-)
2473 Generate debug information in default version of DWARF format
2476 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2477 Generate debug information in DWARF v2 (or later) format
2480 Common JoinedOrMissing
2481 Generate debug information in default extended format
2484 Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2485 Don't generate DWARF pubnames and pubtypes sections.
2488 Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2489 Generate DWARF pubnames and pubtypes sections.
2492 Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2493 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2495 gno-record-gcc-switches
2496 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2497 Don't record gcc command line switches in DWARF DW_AT_producer.
2499 grecord-gcc-switches
2500 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2501 Record gcc command line switches in DWARF DW_AT_producer.
2504 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2505 Don't generate debug information in separate .dwo files
2508 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2509 Generate debug information in separate .dwo files
2512 Common JoinedOrMissing Negative(gstabs+)
2513 Generate debug information in STABS format
2516 Common JoinedOrMissing Negative(gvms)
2517 Generate debug information in extended STABS format
2520 Common RejectNegative Var(dwarf_strict,0) Init(0)
2521 Emit DWARF additions beyond selected version
2524 Common Report RejectNegative Var(dwarf_strict,1)
2525 Don't emit DWARF additions beyond selected version
2528 Common Report Var(flag_gtoggle)
2529 Toggle debug information generation
2532 Common JoinedOrMissing Negative(gxcoff)
2533 Generate debug information in VMS format
2536 Common JoinedOrMissing Negative(gxcoff+)
2537 Generate debug information in XCOFF format
2540 Common JoinedOrMissing Negative(gcoff)
2541 Generate debug information in extended XCOFF format
2544 Name(compressed_debug_sections) Type(int)
2546 ; Since -gz= is completely handled in specs, the values aren't used and we
2547 ; assign arbitrary constants.
2549 Enum(compressed_debug_sections) String(none) Value(0)
2552 Enum(compressed_debug_sections) String(zlib) Value(1)
2555 Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
2559 Generate compressed debug sections
2562 Common Driver Joined Enum(compressed_debug_sections)
2563 -gz=<format> Generate compressed debug sections in format <format>
2566 Driver Joined Separate
2569 Common Joined Var(plugindir_string) Init(0)
2570 -iplugindir=<dir> Set <dir> to be the default plugin directory
2573 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2574 -imultiarch <dir> Set <dir> to be the multiarch include subdirectory
2577 Driver Joined Separate
2582 no-canonical-prefixes
2595 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2596 -o <file> Place output into <file>
2599 Common Var(profile_flag)
2600 Enable function profiling
2603 Driver Var(pass_exit_codes)
2606 Common Alias(Wpedantic)
2609 Common Var(flag_pedantic_errors)
2610 Like -pedantic but issue them as errors
2616 Driver Var(use_pipes)
2619 Driver JoinedOrMissing Var(print_file_name)
2621 print-libgcc-file-name
2624 print-multi-directory
2625 Driver Var(print_multi_directory)
2628 Driver Var(print_multi_lib)
2630 print-multi-os-directory
2631 Driver Var(print_multi_os_directory)
2634 Driver Var(print_multiarch)
2637 Driver JoinedOrMissing Var(print_prog_name)
2640 Driver Var(print_search_dirs)
2643 Driver Var(print_sysroot)
2645 print-sysroot-headers-suffix
2646 Driver Var(print_sysroot_headers_suffix)
2649 Common Var(quiet_flag) RejectDriver
2650 Do not display functions compiled or elapsed time
2668 Driver Var(report_times)
2671 Driver JoinedOrMissing
2674 Driver Joined Separate
2678 ; C option, but driver must not handle as "-u ndef".
2681 Common Driver Var(verbose_flag)
2682 Enable verbose output
2685 Common Var(version_flag) RejectDriver
2686 Display the compiler's version
2689 Common Var(inhibit_warnings)
2693 Driver Separate Var(wrapper_string)
2696 Driver Joined Separate
2699 Driver RejectNegative Negative(pie)
2700 Create a shared library
2706 Driver Separate Alias(specs=)
2719 ; Documented for Fortran, but always accepted by driver.
2726 ; Documented for Go, but always accepted by driver.
2744 Driver RejectNegative Negative(shared)
2745 Create a position independent executable
2748 Driver Joined Separate
2751 Common Report Var(flag_use_caller_save) Optimization
2752 Use caller save register across calls if possible
2754 ; This comment is to ensure we retain the blank line above.