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 fhoist-adjacent-loads
1255 Common Report Var(flag_hoist_adjacent_loads) Optimization
1256 Enable hoisting adjacent loads to encourage generating conditional move
1259 floop-parallelize-all
1260 Common Report Var(flag_loop_parallelize_all) Optimization
1261 Mark all loops as parallel
1264 Common Report Var(flag_loop_strip_mine) Optimization
1265 Enable Loop Strip Mining transformation
1268 Common Report Var(flag_loop_interchange) Optimization
1269 Enable Loop Interchange transformation
1272 Common Report Var(flag_loop_block) Optimization
1273 Enable Loop Blocking transformation
1276 Common Report Var(flag_tm)
1277 Enable support for GNU transactional memory
1280 Common Report Var(flag_gnu_unique) Init(1)
1281 Use STB_GNU_UNIQUE if supported by the assembler
1285 Does nothing. Preserved for backward compatibility.
1288 Common Report Var(flag_loop_optimize_isl) Optimization
1289 Enable the ISL based loop nest optimizer
1291 fstrict-volatile-bitfields
1292 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1293 Force bitfield accesses to match their type width
1295 fguess-branch-probability
1296 Common Report Var(flag_guess_branch_prob) Optimization
1297 Enable guessing of branch probabilities
1299 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1300 ; Generate position-independent code for executables if possible
1301 ; On SVR4 targets, it also controls whether or not to emit a
1302 ; string identifying the compiler.
1304 Common Report Var(flag_no_ident,0)
1305 Process #ident directives
1308 Common Report Var(flag_if_conversion) Optimization
1309 Perform conversion of conditional jumps to branchless equivalents
1312 Common Report Var(flag_if_conversion2) Optimization
1313 Perform conversion of conditional jumps to conditional execution
1316 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1317 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1320 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1323 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1326 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1329 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1331 ftree-loop-if-convert
1332 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1333 Convert conditional jumps in innermost loops to branchless equivalents
1335 ftree-loop-if-convert-stores
1336 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1337 Also if-convert conditional jumps containing memory writes
1339 ; -finhibit-size-directive inhibits output of .size for ELF.
1340 ; This is used only for compiling crtstuff.c,
1341 ; and it may be extended to other effects
1342 ; needed for crtstuff.c on other systems.
1343 finhibit-size-directive
1344 Common Report Var(flag_inhibit_size_directive)
1345 Do not generate .size directives
1348 Common Report Var(flag_indirect_inlining)
1349 Perform indirect inlining
1351 ; General flag to enable inlining. Specifying -fno-inline will disable
1352 ; all inlining apart from always-inline functions.
1354 Common Report Var(flag_no_inline,0) Init(0) Optimization
1355 Enable inlining of function declared \"inline\", disabling disables all inlining
1357 finline-small-functions
1358 Common Report Var(flag_inline_small_functions) Optimization
1359 Integrate functions into their callers when code size is known not to grow
1362 Common Report Var(flag_inline_functions) Optimization
1363 Integrate functions not declared \"inline\" into their callers when profitable
1365 finline-functions-called-once
1366 Common Report Var(flag_inline_functions_called_once) Optimization
1367 Integrate functions only required by their single caller
1370 Common RejectNegative Joined Alias(finline-limit=)
1373 Common RejectNegative Joined UInteger
1374 -finline-limit=<number> Limit the size of inlined functions to <number>
1377 Common Report Var(flag_inline_atomics) Init(1) Optimization
1378 Inline __atomic operations when a lock free instruction sequence is available.
1380 finstrument-functions
1381 Common Report Var(flag_instrument_function_entry_exit)
1382 Instrument function entry and exit with profiling calls
1384 finstrument-functions-exclude-function-list=
1385 Common RejectNegative Joined
1386 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1388 finstrument-functions-exclude-file-list=
1389 Common RejectNegative Joined
1390 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1393 Common Report Var(flag_ipa_cp) Optimization
1394 Perform interprocedural constant propagation
1397 Common Report Var(flag_ipa_cp_clone) Optimization
1398 Perform cloning to make Interprocedural constant propagation stronger
1401 Common Report Var(flag_ipa_profile) Init(0) Optimization
1402 Perform interprocedural profile propagation
1405 Common Report Var(flag_ipa_pta) Init(0) Optimization
1406 Perform interprocedural points-to analysis
1409 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1410 Discover pure and const functions
1413 Common Report Var(flag_ipa_reference) Init(0) Optimization
1414 Discover readonly and non addressable static variables
1418 Does nothing. Preserved for backward compatibility.
1422 Does nothing. Preserved for backward compatibility.
1425 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1426 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1429 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1432 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1435 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1438 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1439 -fira-region=[one|all|mixed] Set regions for IRA
1442 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1445 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1448 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1451 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1454 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1455 Use IRA based register pressure calculation
1456 in RTL hoist optimizations.
1459 Common Report Var(flag_ira_loop_pressure) Optimization
1460 Use IRA based register pressure calculation
1461 in RTL loop optimizations.
1463 fira-share-save-slots
1464 Common Report Var(flag_ira_share_save_slots) Init(1)
1465 Share slots for saving different hard registers.
1467 fira-share-spill-slots
1468 Common Report Var(flag_ira_share_spill_slots) Init(1)
1469 Share stack slots for spilled pseudo-registers.
1472 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1473 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1476 Common Report Var(flag_ivopts) Init(1) Optimization
1477 Optimize induction variables on trees
1480 Common Var(flag_jump_tables) Init(1) Optimization
1481 Use jump tables for sufficiently large switch statements
1483 fkeep-inline-functions
1484 Common Report Var(flag_keep_inline_functions)
1485 Generate code for functions even if they are fully inlined
1488 Common Report Var(flag_keep_static_consts) Init(1)
1489 Emit static const variables even if they are not used
1492 Common Report Var(flag_leading_underscore) Init(-1)
1493 Give external symbols a leading underscore
1497 Does nothing. Preserved for backward compatibility.
1501 Enable link-time optimization.
1504 Common RejectNegative Joined Var(flag_lto)
1505 Link-time optimization with number of parallel jobs or jobserver.
1508 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1511 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1514 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1517 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1520 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1523 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1526 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1527 Specify the algorithm to partition symbols and vars at linktime
1529 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1530 flto-compression-level=
1531 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1532 -flto-compression-level=<number> Use zlib compression level <number> for IL
1535 Common Report Var(flag_lto_report) Init(0)
1536 Report various link-time optimization statistics
1539 Common Report Var(flag_lto_report_wpa) Init(0)
1540 Report various link-time optimization statistics for WPA only
1543 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1544 Set errno after built-in math functions
1547 Common Joined RejectNegative UInteger Var(flag_max_errors)
1548 -fmax-errors=<number> Maximum number of errors to report
1551 Common Report Var(mem_report)
1552 Report on permanent memory allocation
1555 Common Report Var(mem_report_wpa)
1556 Report on permanent memory allocation in WPA only
1558 ; This will attempt to merge constant section constants, if 1 only
1559 ; string constants and constants from constant pool, if 2 also constant
1561 fmerge-all-constants
1562 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1563 Attempt to merge identical constants and constant variables
1566 Common Report Var(flag_merge_constants,1) Optimization
1567 Attempt to merge identical constants across compilation units
1569 fmerge-debug-strings
1570 Common Report Var(flag_merge_debug_strings) Init(1)
1571 Attempt to merge identical debug strings across compilation units
1574 Common RejectNegative Joined UInteger
1575 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1578 Common Report Var(flag_modulo_sched) Optimization
1579 Perform SMS based modulo scheduling before the first scheduling pass
1581 fmodulo-sched-allow-regmoves
1582 Common Report Var(flag_modulo_sched_allow_regmoves)
1583 Perform SMS based modulo scheduling with register moves allowed
1585 fmove-loop-invariants
1586 Common Report Var(flag_move_loop_invariants) Optimization
1587 Move loop invariant computations out of loops
1590 Common Var(flag_dce) Init(1) Optimization
1591 Use the RTL dead code elimination pass
1594 Common Var(flag_dse) Init(1) Optimization
1595 Use the RTL dead store elimination pass
1597 freschedule-modulo-scheduled-loops
1598 Common Report Var(flag_resched_modulo_sched) Optimization
1599 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1601 fnon-call-exceptions
1602 Common Report Var(flag_non_call_exceptions) Optimization
1603 Support synchronous non-call exceptions
1606 Common Report Var(flag_omit_frame_pointer) Optimization
1607 When possible do not generate stack frames
1610 Common Report Var(flag_opt_info) Optimization
1611 Enable all optimization info dumps on stderr
1614 Common Joined RejectNegative Var(common_deferred_options) Defer
1615 -fopt-info[-<type>=filename] Dump compiler optimization details
1617 foptimize-register-move
1619 Does nothing. Preserved for backward compatibility.
1621 foptimize-sibling-calls
1622 Common Report Var(flag_optimize_sibling_calls) Optimization
1623 Optimize sibling and tail recursive calls
1626 Common Report Var(flag_partial_inlining)
1627 Perform partial inlining
1630 Common Report Var(pre_ipa_mem_report)
1631 Report on memory allocation before interprocedural optimization
1633 fpost-ipa-mem-report
1634 Common Report Var(post_ipa_mem_report)
1635 Report on memory allocation before interprocedural optimization
1638 Common Report Var(flag_pack_struct) Optimization
1639 Pack structure members together without holes
1642 Common RejectNegative Joined UInteger Optimization
1643 -fpack-struct=<number> Set initial maximum structure member alignment
1646 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1647 Return small aggregates in memory, not registers
1650 Common Report Var(flag_peel_loops) Optimization
1651 Perform loop peeling
1654 Common Report Var(flag_no_peephole,0) Optimization
1655 Enable machine specific peephole optimizations
1658 Common Report Var(flag_peephole2) Optimization
1659 Enable an RTL peephole pass before sched2
1662 Common Report Var(flag_pic,2) Negative(fPIE)
1663 Generate position-independent code if possible (large mode)
1666 Common Report Var(flag_pie,2) Negative(fpic)
1667 Generate position-independent code for executables if possible (large mode)
1670 Common Report Var(flag_pic,1) Negative(fpie)
1671 Generate position-independent code if possible (small mode)
1674 Common Report Var(flag_pie,1) Negative(fPIC)
1675 Generate position-independent code for executables if possible (small mode)
1678 Common Joined RejectNegative Var(common_deferred_options) Defer
1679 Specify a plugin to load
1682 Common Joined RejectNegative Var(common_deferred_options) Defer
1683 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1685 fpredictive-commoning
1686 Common Report Var(flag_predictive_commoning) Optimization
1687 Run predictive commoning optimization.
1689 fprefetch-loop-arrays
1690 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1691 Generate prefetch instructions, if available, for arrays in loops
1694 Common Report Var(profile_flag)
1695 Enable basic program profiling code
1698 Common Report Var(profile_arc_flag)
1699 Insert arc-based program profiling code
1702 Common Joined RejectNegative Var(profile_data_prefix)
1703 Set the top-level directory for storing the profile data.
1704 The default is 'pwd'.
1707 Common Report Var(flag_profile_correction)
1708 Enable correction of flow inconsistent profile data input
1712 Enable common options for generating profile info for profile feedback directed optimizations
1715 Common Joined RejectNegative
1716 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1719 Common Var(flag_profile_use)
1720 Enable common options for performing profile feedback directed optimizations
1723 Common Joined RejectNegative
1724 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1727 Common Report Var(flag_profile_values)
1728 Insert code to profile values of expressions
1731 Common Report Var(profile_report)
1732 Report on consistency of profile
1734 fprofile-reorder-functions
1735 Common Report Var(flag_profile_reorder_functions)
1736 Enable function reordering that improves code placement
1739 Common Var(common_deferred_options) Defer
1742 Common Joined RejectNegative Var(common_deferred_options) Defer
1743 -frandom-seed=<string> Make compile reproducible using <string>
1745 ; This switch causes the command line that was used to create an
1746 ; object file to be recorded into the object file. The exact format
1747 ; of this recording is target and binary file format dependent.
1748 ; It is related to the -fverbose-asm switch, but that switch only
1749 ; records information in the assembler output file as comments, so
1750 ; they never reach the object file.
1751 frecord-gcc-switches
1752 Common Report Var(flag_record_gcc_switches)
1753 Record gcc command line switches in the object file.
1756 Common Report Var(flag_pcc_struct_return,0) Optimization
1757 Return small aggregates in registers
1761 Does nothing. Preserved for backward compatibility.
1763 flive-range-shrinkage
1764 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
1765 Relief of register pressure through live range shrinkage
1768 Common Report Var(flag_rename_registers) Init(2) Optimization
1769 Perform a register renaming optimization pass
1772 Common Report Var(flag_reorder_blocks) Optimization
1773 Reorder basic blocks to improve code placement
1775 freorder-blocks-and-partition
1776 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1777 Reorder basic blocks and partition into hot and cold sections
1780 Common Report Var(flag_reorder_functions) Optimization
1781 Reorder functions to improve code placement
1783 frerun-cse-after-loop
1784 Common Report Var(flag_rerun_cse_after_loop) Optimization
1785 Add a common subexpression elimination pass after loop optimizations
1789 Does nothing. Preserved for backward compatibility.
1792 Common Report Var(flag_rounding_math) Optimization SetByCombined
1793 Disable optimizations that assume default FP rounding behavior
1796 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1797 Enable scheduling across basic blocks
1800 Common Report Var(flag_sched_pressure) Init(0) Optimization
1801 Enable register pressure sensitive insn scheduling
1804 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1805 Allow speculative motion of non-loads
1808 Common Report Var(flag_schedule_speculative_load) Optimization
1809 Allow speculative motion of some loads
1811 fsched-spec-load-dangerous
1812 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1813 Allow speculative motion of more loads
1816 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1817 -fsched-verbose=<number> Set the verbosity level of the scheduler
1819 fsched2-use-superblocks
1820 Common Report Var(flag_sched2_use_superblocks) Optimization
1821 If scheduling post reload, do superblock scheduling
1825 Does nothing. Preserved for backward compatibility.
1828 Common Report Var(flag_schedule_insns) Optimization
1829 Reschedule instructions before register allocation
1832 Common Report Var(flag_schedule_insns_after_reload) Optimization
1833 Reschedule instructions after register allocation
1835 ; This flag should be on when a target implements non-trivial
1836 ; scheduling hooks, maybe saving some information for its own sake.
1837 ; On IA64, for example, this is used for correct bundling.
1838 fselective-scheduling
1839 Common Report Var(flag_selective_scheduling) Optimization
1840 Schedule instructions using selective scheduling algorithm
1842 fselective-scheduling2
1843 Common Report Var(flag_selective_scheduling2) Optimization
1844 Run selective scheduling after reload
1846 fsel-sched-pipelining
1847 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1848 Perform software pipelining of inner loops during selective scheduling
1850 fsel-sched-pipelining-outer-loops
1851 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1852 Perform software pipelining of outer loops during selective scheduling
1854 fsel-sched-reschedule-pipelined
1855 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1856 Reschedule pipelined regions without pipelining
1858 fsemantic-interposition
1859 Common Report Var(flag_semantic_interposition) Init(1)
1860 Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker
1862 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1863 ; of stalled insns into the ready list.
1864 fsched-stalled-insns
1865 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1866 Allow premature scheduling of queued insns
1868 fsched-stalled-insns=
1869 Common RejectNegative Joined UInteger
1870 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1872 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1873 ; be examined for a dependency on a stalled insn that is candidate for
1874 ; premature removal from the queue of stalled insns into the ready list (has
1875 ; an effect only if the flag 'sched_stalled_insns' is set).
1876 fsched-stalled-insns-dep
1877 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1878 Set dependence distance checking in premature scheduling of queued insns
1880 fsched-stalled-insns-dep=
1881 Common RejectNegative Joined UInteger
1882 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1884 fsched-group-heuristic
1885 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1886 Enable the group heuristic in the scheduler
1888 fsched-critical-path-heuristic
1889 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1890 Enable the critical path heuristic in the scheduler
1892 fsched-spec-insn-heuristic
1893 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1894 Enable the speculative instruction heuristic in the scheduler
1896 fsched-rank-heuristic
1897 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1898 Enable the rank heuristic in the scheduler
1900 fsched-last-insn-heuristic
1901 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1902 Enable the last instruction heuristic in the scheduler
1904 fsched-dep-count-heuristic
1905 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1906 Enable the dependent count heuristic in the scheduler
1909 Common Report Var(flag_section_anchors) Optimization
1910 Access data in the same section from shared anchor points
1914 Does nothing. Preserved for backward compatibility.
1918 Does nothing. Preserved for backward compatibility.
1921 Common Report Var(flag_ree) Init(0)
1922 Turn on Redundant Extensions Elimination pass.
1925 Common Report Var(flag_show_column) Init(1)
1926 Show column numbers in diagnostics, when available. Default on
1929 Common Report Var(flag_shrink_wrap) Optimization
1930 Emit function prologues only before parts of the function that need it,
1931 rather than at the top of the function.
1934 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1935 Disable optimizations observable by IEEE signaling NaNs
1938 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1939 Disable floating point optimizations that ignore the IEEE signedness of zero
1941 fsingle-precision-constant
1942 Common Report Var(flag_single_precision_constant) Optimization
1943 Convert floating point constants to single precision constants
1945 fsplit-ivs-in-unroller
1946 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1947 Split lifetimes of induction variables when loops are unrolled
1950 Common Report Var(flag_split_stack) Init(-1)
1951 Generate discontiguous stack frames
1954 Common Report Var(flag_split_wide_types) Optimization
1955 Split wide types into independent registers
1958 Common Report Var(flag_ssa_phiopt) Optimization
1959 Optimize conditional patterns using SSA PHI nodes
1961 fvariable-expansion-in-unroller
1962 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1963 Apply variable expansion when loops are unrolled
1966 Common Report RejectNegative Joined
1967 -fstack-check=[no|generic|specific] Insert stack checking code into the program
1970 Common Alias(fstack-check=, specific, no)
1971 Insert stack checking code into the program. Same as -fstack-check=specific
1974 Common Var(common_deferred_options) Defer
1976 fstack-limit-register=
1977 Common RejectNegative Joined Var(common_deferred_options) Defer
1978 -fstack-limit-register=<register> Trap if the stack goes past <register>
1980 fstack-limit-symbol=
1981 Common RejectNegative Joined Var(common_deferred_options) Defer
1982 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
1985 Common Report Var(flag_stack_protect, 1)
1986 Use propolice as a stack protection method
1988 fstack-protector-all
1989 Common Report RejectNegative Var(flag_stack_protect, 2)
1990 Use a stack protection method for every function
1992 fstack-protector-strong
1993 Common Report RejectNegative Var(flag_stack_protect, 3)
1994 Use a smart stack protection method for certain functions
1997 Common RejectNegative Var(flag_stack_usage)
1998 Output stack usage information on a per-function basis
2002 Does nothing. Preserved for backward compatibility.
2004 ; Nonzero if we should do (language-dependent) alias analysis.
2005 ; Typically, this analysis will assume that expressions of certain
2006 ; types do not alias expressions of certain other types. Only used
2007 ; if alias analysis (in general) is enabled.
2009 Common Report Var(flag_strict_aliasing) Optimization
2010 Assume strict aliasing rules apply
2013 Common Report Var(flag_strict_overflow)
2014 Treat signed overflow as undefined
2017 Common Report Var(flag_sync_libcalls) Init(1)
2018 Implement __atomic operations via libcalls to legacy __sync functions
2021 Common Report Var(flag_syntax_only)
2022 Check for syntax errors, then stop
2025 Common Report Var(flag_test_coverage)
2026 Create data files needed by \"gcov\"
2029 Common Report Var(flag_thread_jumps) Optimization
2030 Perform jump threading optimizations
2033 Common Report Var(time_report)
2034 Report the time taken by each compiler pass
2037 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2038 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
2041 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2044 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2047 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2050 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2053 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2056 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
2057 Reorder top level functions, variables, and asms
2060 Common Report Var(flag_tracer)
2061 Perform superblock formation via tail duplication
2063 ; Zero means that floating-point math operations cannot generate a
2064 ; (user-visible) trap. This is the case, for example, in nonstop
2065 ; IEEE 754 arithmetic.
2067 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2068 Assume floating-point operations can trap
2071 Common Report Var(flag_trapv) Optimization
2072 Trap for signed overflow in addition, subtraction and multiplication
2075 Common Report Var(flag_tree_ccp) Optimization
2076 Enable SSA-CCP optimization on trees
2079 Common Report Var(flag_tree_bit_ccp) Optimization
2080 Enable SSA-BIT-CCP optimization on trees
2084 Does nothing. Preserved for backward compatibility.
2087 Common Report Var(flag_tree_ch) Optimization
2088 Enable loop header copying on trees
2090 ftree-coalesce-inlined-vars
2091 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2092 Enable coalescing of copy-related user variables that are inlined
2095 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2096 Enable coalescing of all copy-related user variables
2099 Common Report Var(flag_tree_copyrename) Optimization
2100 Replace SSA temporaries with better names in copies
2103 Common Report Var(flag_tree_copy_prop) Optimization
2104 Enable copy propagation on trees
2106 ftree-store-copy-prop
2108 Does nothing. Preserved for backward compatibility.
2111 Common Report Var(flag_tree_cselim) Init(2) Optimization
2112 Transform condition stores into unconditional ones
2114 ftree-switch-conversion
2115 Common Report Var(flag_tree_switch_conversion) Optimization
2116 Perform conversions of switch initializations.
2119 Common Report Var(flag_tree_dce) Optimization
2120 Enable SSA dead code elimination optimization on trees
2122 ftree-dominator-opts
2123 Common Report Var(flag_tree_dom) Optimization
2124 Enable dominator optimizations
2127 Common Report Var(flag_tree_tail_merge) Optimization
2128 Enable tail merging on trees
2131 Common Report Var(flag_tree_dse) Optimization
2132 Enable dead store elimination
2135 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2136 Enable forward propagation on trees
2139 Common Report Var(flag_tree_fre) Optimization
2140 Enable Full Redundancy Elimination (FRE) on trees
2143 Common Report Var(flag_optimize_strlen) Optimization
2144 Enable string length optimizations on trees
2146 fisolate-erroneous-paths-dereference
2147 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2148 Detect paths which trigger erroneous or undefined behaviour due to
2149 dereferencing a NULL pointer. Isolate those paths from the main control
2150 flow and turn the statement with erroneous or undefined behaviour into a trap.
2152 fisolate-erroneous-paths-attribute
2153 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2154 Detect paths which trigger erroneous or undefined behaviour due a NULL value
2155 being used in a way which is forbidden by a returns_nonnull or nonnull
2156 attribute. Isolate those paths from the main control flow and turn the
2157 statement with erroneous or undefined behaviour into a trap.
2159 ftree-loop-distribution
2160 Common Report Var(flag_tree_loop_distribution) Optimization
2161 Enable loop distribution on trees
2163 ftree-loop-distribute-patterns
2164 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2165 Enable loop distribution for patterns transformed into a library call
2168 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2169 Enable loop invariant motion on trees
2172 Common Alias(floop-interchange)
2173 Enable loop interchange transforms. Same as -floop-interchange
2176 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2177 Create canonical induction variables in loops
2180 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2181 Enable loop optimizations on tree level
2183 ftree-parallelize-loops=
2184 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2185 Enable automatic parallelization of loops
2188 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2189 Enable hoisting loads from conditional pointers.
2192 Common Report Var(flag_tree_pre) Optimization
2193 Enable SSA-PRE optimization on trees
2196 Common Report Var(flag_tree_partial_pre) Optimization
2197 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2200 Common Report Var(flag_tree_pta) Optimization
2201 Perform function-local points-to analysis on trees.
2204 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2205 Enable reassociation on tree level
2209 Does nothing. Preserved for backward compatibility.
2212 Common Report Var(flag_tree_sink) Optimization
2213 Enable SSA code sinking on trees
2216 Common Report Var(flag_tree_slsr) Optimization
2217 Perform straight-line strength reduction
2220 Common Report Var(flag_tree_sra) Optimization
2221 Perform scalar replacement of aggregates
2224 Common Report Var(flag_tree_ter) Optimization
2225 Replace temporary expressions in the SSA->normal pass
2228 Common Report Var(flag_tree_live_range_split) Optimization
2229 Perform live range splitting during the SSA->normal pass
2232 Common Report Var(flag_tree_vrp) Init(0) Optimization
2233 Perform Value Range Propagation on trees
2236 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2237 Compile whole compilation unit at a time
2240 Common Report Var(flag_unroll_loops) Optimization
2241 Perform loop unrolling when iteration count is known
2244 Common Report Var(flag_unroll_all_loops) Optimization
2245 Perform loop unrolling for all loops
2247 ; Nonzero means that loop optimizer may assume that the induction variables
2248 ; that control loops do not overflow and that the loops with nontrivial
2249 ; exit condition are not infinite
2250 funsafe-loop-optimizations
2251 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2252 Allow loop optimizations to assume that the loops behave in normal way
2255 Common Report Var(flag_associative_math) SetByCombined
2256 Allow optimization for floating-point arithmetic which may change the
2257 result of the operation due to rounding.
2260 Common Report Var(flag_reciprocal_math) SetByCombined
2261 Same as -fassociative-math for expressions which include division.
2263 ; Nonzero means that unsafe floating-point math optimizations are allowed
2264 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2265 ; are allowed to assume that their arguments and results are "normal"
2266 ; (e.g., nonnegative for SQRT).
2267 funsafe-math-optimizations
2268 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2269 Allow math optimizations that may violate IEEE or ISO standards
2272 Common Report Var(flag_unswitch_loops) Optimization
2273 Perform loop unswitching
2276 Common Report Var(flag_unwind_tables) Optimization
2277 Just generate unwind tables for exception handling
2280 Common Driver Negative(fuse-ld=gold)
2281 Use the bfd linker instead of the default linker
2284 Common Driver Negative(fuse-ld=bfd)
2285 Use the gold linker instead of the default linker
2288 Common Undocumented Var(flag_use_linker_plugin)
2290 ; Positive if we should track variables, negative if we should run
2291 ; the var-tracking pass only to discard debug annotations, zero if
2292 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2293 ; will be set according to optimize, debug_info_level and debug_hooks
2294 ; in process_options ().
2296 Common Report Var(flag_var_tracking) Init(2) Optimization
2297 Perform variable tracking
2299 ; Positive if we should track variables at assignments, negative if
2300 ; we should run the var-tracking pass only to discard debug
2301 ; annotations. When flag_var_tracking_assignments ==
2302 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2303 fvar-tracking-assignments
2304 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2305 Perform variable tracking by annotating assignments
2307 ; Nonzero if we should toggle flag_var_tracking_assignments after
2308 ; processing options and computing its default. */
2309 fvar-tracking-assignments-toggle
2310 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2311 Toggle -fvar-tracking-assignments
2313 ; Positive if we should track uninitialized variables, negative if
2314 ; we should run the var-tracking pass only to discard debug
2315 ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
2316 ; will be set according to flag_var_tracking.
2317 fvar-tracking-uninit
2318 Common Report Var(flag_var_tracking_uninit) Optimization
2319 Perform variable tracking and also tag variables that are uninitialized
2322 Common Report Var(flag_tree_vectorize) Optimization
2323 Enable vectorization on trees
2325 ftree-vectorizer-verbose=
2326 Common Joined RejectNegative Ignore
2327 Does nothing. Preserved for backward compatibility.
2329 ftree-loop-vectorize
2330 Common Report Var(flag_tree_loop_vectorize) Optimization
2331 Enable loop vectorization on trees
2334 Common Report Var(flag_tree_slp_vectorize) Optimization
2335 Enable basic block vectorization (SLP) on trees
2338 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT)
2339 Specifies the cost model for vectorization
2342 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED)
2343 Specifies the vectorization cost model for code marked with a simd directive
2346 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2349 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2352 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2355 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2358 Common RejectNegative Alias(fvect-cost-model=,dynamic)
2359 Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
2362 Common RejectNegative Alias(fvect-cost-model=,unlimited)
2363 Enables the unlimited vectorizer cost model. Preserved for backward compatibility.
2365 ftree-vect-loop-version
2367 Does nothing. Preserved for backward compatibility.
2370 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2371 Enable copy propagation of scalar-evolution information.
2373 ; -fverbose-asm causes extra commentary information to be produced in
2374 ; the generated assembly code (to make it more readable). This option
2375 ; is generally only of use to those who actually need to read the
2376 ; generated assembly code (perhaps while debugging the compiler itself).
2377 ; -fno-verbose-asm, the default, causes the extra information
2378 ; to not be added and is useful when comparing two assembler files.
2380 Common Report Var(flag_verbose_asm)
2381 Add extra commentary to assembler output
2384 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2385 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2388 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2391 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2394 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2397 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2400 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2403 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2404 Validate vtable pointers before using them.
2407 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2410 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2413 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2416 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2419 Common Var(flag_vtv_counts)
2420 Output vtable verification counters.
2423 Common Var(flag_vtv_debug)
2424 Output vtable verification pointer sets information.
2427 Common Report Var(flag_value_profile_transformations) Optimization
2428 Use expression value profiles in optimizations
2431 Common Report Var(flag_web) Init(2) Optimization
2432 Construct webs and split unrelated uses of single variable
2434 ftree-builtin-call-dce
2435 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2436 Enable conditional dead code elimination for builtin calls
2439 Common Report Var(flag_whole_program) Init(0) Optimization
2440 Perform whole program optimizations
2443 Common Report Var(flag_wrapv) Optimization
2444 Assume signed arithmetic overflow wraps around
2446 fzero-initialized-in-bss
2447 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2448 Put zero initialized data in the bss section
2451 Common JoinedOrMissing
2452 Generate debug information in default format
2455 Common JoinedOrMissing Negative(gdwarf)
2456 Generate debug information in COFF format
2459 Common JoinedOrMissing Negative(gdwarf-)
2460 Generate debug information in default version of DWARF format
2463 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2464 Generate debug information in DWARF v2 (or later) format
2467 Common JoinedOrMissing
2468 Generate debug information in default extended format
2471 Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2472 Don't generate DWARF pubnames and pubtypes sections.
2475 Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2476 Generate DWARF pubnames and pubtypes sections.
2479 Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2480 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2482 gno-record-gcc-switches
2483 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2484 Don't record gcc command line switches in DWARF DW_AT_producer.
2486 grecord-gcc-switches
2487 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2488 Record gcc command line switches in DWARF DW_AT_producer.
2491 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2492 Don't generate debug information in separate .dwo files
2495 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2496 Generate debug information in separate .dwo files
2499 Common JoinedOrMissing Negative(gstabs+)
2500 Generate debug information in STABS format
2503 Common JoinedOrMissing Negative(gvms)
2504 Generate debug information in extended STABS format
2507 Common RejectNegative Var(dwarf_strict,0) Init(0)
2508 Emit DWARF additions beyond selected version
2511 Common Report RejectNegative Var(dwarf_strict,1)
2512 Don't emit DWARF additions beyond selected version
2515 Common Report Var(flag_gtoggle)
2516 Toggle debug information generation
2519 Common JoinedOrMissing Negative(gxcoff)
2520 Generate debug information in VMS format
2523 Common JoinedOrMissing Negative(gxcoff+)
2524 Generate debug information in XCOFF format
2527 Common JoinedOrMissing Negative(gcoff)
2528 Generate debug information in extended XCOFF format
2531 Name(compressed_debug_sections) Type(int)
2533 ; Since -gz= is completely handled in specs, the values aren't used and we
2534 ; assign arbitrary constants.
2536 Enum(compressed_debug_sections) String(none) Value(0)
2539 Enum(compressed_debug_sections) String(zlib) Value(1)
2542 Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
2546 Generate compressed debug sections
2549 Common Driver Joined Enum(compressed_debug_sections)
2550 -gz=<format> Generate compressed debug sections in format <format>
2553 Driver Joined Separate
2556 Common Joined Var(plugindir_string) Init(0)
2557 -iplugindir=<dir> Set <dir> to be the default plugin directory
2560 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2561 -imultiarch <dir> Set <dir> to be the multiarch include subdirectory
2564 Driver Joined Separate
2569 no-canonical-prefixes
2582 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2583 -o <file> Place output into <file>
2586 Common Var(profile_flag)
2587 Enable function profiling
2590 Driver Var(pass_exit_codes)
2593 Common Alias(Wpedantic)
2596 Common Var(flag_pedantic_errors)
2597 Like -pedantic but issue them as errors
2603 Driver Var(use_pipes)
2606 Driver JoinedOrMissing Var(print_file_name)
2608 print-libgcc-file-name
2611 print-multi-directory
2612 Driver Var(print_multi_directory)
2615 Driver Var(print_multi_lib)
2617 print-multi-os-directory
2618 Driver Var(print_multi_os_directory)
2621 Driver Var(print_multiarch)
2624 Driver JoinedOrMissing Var(print_prog_name)
2627 Driver Var(print_search_dirs)
2630 Driver Var(print_sysroot)
2632 print-sysroot-headers-suffix
2633 Driver Var(print_sysroot_headers_suffix)
2636 Common Var(quiet_flag) RejectDriver
2637 Do not display functions compiled or elapsed time
2655 Driver Var(report_times)
2658 Driver JoinedOrMissing
2661 Driver Joined Separate
2665 ; C option, but driver must not handle as "-u ndef".
2668 Common Driver Var(verbose_flag)
2669 Enable verbose output
2672 Common Var(version_flag) RejectDriver
2673 Display the compiler's version
2676 Common Var(inhibit_warnings)
2680 Driver Separate Var(wrapper_string)
2683 Driver Joined Separate
2686 Driver RejectNegative Negative(pie)
2687 Create a shared library
2693 Driver Separate Alias(specs=)
2706 ; Documented for Fortran, but always accepted by driver.
2713 ; Documented for Go, but always accepted by driver.
2731 Driver RejectNegative Negative(shared)
2732 Create a position independent executable
2735 Driver Joined Separate
2738 Common Report Var(flag_use_caller_save) Optimization
2739 Use caller save register across calls if possible
2741 ; This comment is to ensure we retain the blank line above.