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_odr_violations) Init(1) Warning
592 Warn about some C++ One Definition Rule violations during link time optimization
595 Common Var(warn_overflow) Init(1) Warning
596 Warn about overflow in arithmetic expressions
599 Common Var(warn_packed) Warning
600 Warn when the packed attribute has no effect on struct layout
603 Common Var(warn_padded) Warning
604 Warn when padding is required to align structure members
607 Common Var(pedantic) Init(0) Warning
608 Issue warnings needed for strict compliance to the standard
611 Common Var(warn_return_local_addr) Init(1) Warning
612 Warn about returning a pointer/reference to a local or temporary variable.
615 Common Var(warn_shadow) Warning
616 Warn when one local variable shadows another
619 Common Var(warn_stack_protect) Warning
620 Warn when not issuing stack smashing protection for some reason
623 Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
624 Warn if stack usage might be larger than specified amount
628 Warn about code which might break strict aliasing rules
631 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
632 Warn about code which might break strict aliasing rules
636 Warn about optimizations that assume that signed overflow is undefined
639 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
640 Warn about optimizations that assume that signed overflow is undefined
642 Wsuggest-attribute=const
643 Common Var(warn_suggest_attribute_const) Warning
644 Warn about functions which might be candidates for __attribute__((const))
646 Wsuggest-attribute=pure
647 Common Var(warn_suggest_attribute_pure) Warning
648 Warn about functions which might be candidates for __attribute__((pure))
650 Wsuggest-attribute=noreturn
651 Common Var(warn_suggest_attribute_noreturn) Warning
652 Warn about functions which might be candidates for __attribute__((noreturn))
655 Common Var(warn_suggest_final_types) Warning
656 Warn about C++ polymorphic types where adding final keyword would improve code quality
658 Wsuggest-final-methods
659 Common Var(warn_suggest_final_methods) Warning
660 Warn about C++ virtual methods where adding final keyword would improve code quality
663 Common Var(warn_system_headers) Warning
664 Do not suppress warnings from system headers
667 Common Var(warn_trampolines) Warning
668 Warn whenever a trampoline is generated
671 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
672 Warn if a comparison is always true or always false due to the limited range of the data type
675 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
676 Warn about uninitialized automatic variables
679 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
680 Warn about maybe uninitialized automatic variables
684 Does nothing. Preserved for backward compatibility.
687 Common Var(warn_unused) Init(0) Warning
688 Enable all -Wunused- warnings
690 Wunused-but-set-parameter
691 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
692 Warn when a function parameter is only set, otherwise unused
694 Wunused-but-set-variable
695 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
696 Warn when a variable is only set, otherwise unused
699 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
700 Warn when a function is unused
703 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
704 Warn when a label is unused
707 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
708 Warn when a function parameter is unused
711 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
712 Warn when an expression value is unused
715 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
716 Warn when a variable is unused
719 Common Var(warn_coverage_mismatch) Init(1) Warning
720 Warn in case profiles in -fprofile-use do not match
722 Wvector-operation-performance
723 Common Var(warn_vector_operation_performance) Warning
724 Warn when a vector operation is compiled outside the SIMD
739 Common Separate Var(aux_info_file_name)
740 -aux-info <file> Emit declaration information into <file>
743 Common Joined Alias(aux-info)
746 Common Separate RejectDriver Var(aux_base_name)
749 Common Separate RejectDriver
759 -d<letters> Enable dumps from specific passes of the compiler
762 Common Separate Var(dump_base_name)
763 -dumpbase <file> Set the file basename to be used for dumps
766 Common Separate Var(dump_dir_name)
767 -dumpdir <dir> Set the directory name to be used for dumps
779 Driver Joined Separate
781 ; This option has historically been passed down to the linker by an
782 ; accident of a %{e*} spec, so ensure it continues to be passed down
783 ; as a single option. The supported option for this purpose is
784 ; -rdynamic. See PR 47390.
788 ; The version of the C++ ABI in use. The following values are allowed:
790 ; 0: The version of the ABI believed most conformant with the C++ ABI
791 ; specification. This ABI may change as bugs are discovered and fixed.
792 ; Therefore, 0 will not necessarily indicate the same ABI in different
795 ; 1: The version of the ABI first used in G++ 3.2. No longer selectable.
797 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
799 ; 3: The version of the ABI that fixes the missing underscore
800 ; in template non-type arguments of pointer type.
802 ; 4: The version of the ABI that introduces unambiguous mangling of
803 ; vector types. First selectable in G++ 4.5.
805 ; 5: The version of the ABI that ignores attribute const/noreturn
806 ; in function pointer mangling, and corrects mangling of decltype and
807 ; function parameters used in other parameters and the return type.
808 ; First selectable in G++ 4.6.
810 ; 6: The version of the ABI that doesn't promote scoped enums to int and
811 ; changes the mangling of template argument packs, const/static_cast,
812 ; prefix ++ and --, and a class scope function used as a template
814 ; First selectable in G++ 4.7.
816 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
817 ; corrects the mangling of lambdas in default argument scope.
818 ; First selectable in G++ 4.8.
820 ; 8: The version of the ABI that corrects the substitution behavior of
821 ; function types with function-cv-qualifiers.
822 ; First selectable in G++ 4.9.
824 ; Additional positive integers will be assigned as new versions of
825 ; the ABI become the default version of the ABI.
827 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(0)
828 The version of the C++ ABI in use
830 faggressive-loop-optimizations
831 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
832 Aggressively optimize loops using language constraints
835 Common Report Var(align_functions,0) Optimization UInteger
836 Align the start of functions
839 Common RejectNegative Joined UInteger Var(align_functions)
842 Common Report Var(align_jumps,0) Optimization UInteger
843 Align labels which are only reached by jumping
846 Common RejectNegative Joined UInteger Var(align_jumps)
849 Common Report Var(align_labels,0) Optimization UInteger
853 Common RejectNegative Joined UInteger Var(align_labels)
856 Common Report Var(align_loops,0) Optimization UInteger
857 Align the start of loops
860 Common RejectNegative Joined UInteger Var(align_loops)
864 Does nothing. Preserved for backward compatibility.
868 Does nothing. Preserved for backward compatibility.
870 fargument-noalias-global
872 Does nothing. Preserved for backward compatibility.
874 fargument-noalias-anything
876 Does nothing. Preserved for backward compatibility.
879 Common Driver Report Joined
880 Select what to sanitize
883 Common Report Var(flag_sanitize_recover) Init(1)
884 After diagnosing undefined behavior attempt to continue execution
886 fsanitize-undefined-trap-on-error
887 Common Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
888 Use trap instead of a library function for undefined behavior sanitization
890 fasynchronous-unwind-tables
891 Common Report Var(flag_asynchronous_unwind_tables) Optimization
892 Generate unwind tables that are exact at each instruction boundary
895 Common Report Var(flag_auto_inc_dec) Init(1)
896 Generate auto-inc/dec instructions
898 ; -fcheck-bounds causes gcc to generate array bounds checks.
899 ; For C, C++ and ObjC: defaults off.
900 ; For Java: defaults to on.
901 ; For Fortran: defaults to off.
903 Common Report Var(flag_bounds_check)
904 Generate code to check bounds before indexing arrays
907 Common Report Var(flag_branch_on_count_reg) Optimization
908 Replace add, compare, branch with branch on count register
910 fbranch-probabilities
911 Common Report Var(flag_branch_probabilities) Optimization
912 Use profiling information for branch probabilities
914 fbranch-target-load-optimize
915 Common Report Var(flag_branch_target_load_optimize) Optimization
916 Perform branch target load optimization before prologue / epilogue threading
918 fbranch-target-load-optimize2
919 Common Report Var(flag_branch_target_load_optimize2) Optimization
920 Perform branch target load optimization after prologue / epilogue threading
923 Common Report Var(flag_btr_bb_exclusive) Optimization
924 Restrict target load migration not to re-use registers in any basic block
927 Common Joined RejectNegative Var(common_deferred_options) Defer
928 -fcall-saved-<register> Mark <register> as being preserved across functions
931 Common Joined RejectNegative Var(common_deferred_options) Defer
932 -fcall-used-<register> Mark <register> as being corrupted by function calls
934 ; Nonzero for -fcaller-saves: allocate values in regs that need to
935 ; be saved across function calls, if that produces overall better code.
936 ; Optional now, so people can test it.
938 Common Report Var(flag_caller_saves) Optimization
939 Save registers around function calls
942 Common Report Var(flag_check_data_deps)
943 Compare the results of several data dependence analyzers.
946 Common Var(flag_check_new)
947 Check the return value of new in C++
949 fcombine-stack-adjustments
950 Common Report Var(flag_combine_stack_adjustments) Optimization
951 Looks for opportunities to reduce stack adjustments and stack references.
954 Common Report Var(flag_no_common,0) Optimization
955 Do not put uninitialized globals in the common section
959 ; Converted by the driver to -fcompare-debug= options.
962 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
963 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
965 fcompare-debug-second
966 Common Driver RejectNegative Var(flag_compare_debug)
967 Run only the second compilation of -fcompare-debug
970 Common Report Var(flag_compare_elim_after_reload) Optimization
971 Perform comparison elimination after register allocation has finished
974 Common Var(flag_conserve_stack) Optimization
975 Do not perform optimizations increasing noticeably stack usage
978 Common Report Var(flag_cprop_registers) Optimization
979 Perform a register copy-propagation optimization pass
982 Common Report Var(flag_crossjumping) Optimization
983 Perform cross-jumping optimization
986 Common Report Var(flag_cse_follow_jumps) Optimization
987 When running CSE, follow jumps to their targets
991 Does nothing. Preserved for backward compatibility.
994 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
995 Omit range reduction step when performing complex division
998 Common Report Var(flag_cx_fortran_rules) Optimization
999 Complex multiplication and division follow Fortran rules
1002 Common Report Var(flag_data_sections) Optimization
1003 Place data items into their own section
1006 Common Report Var(common_deferred_options) Defer
1007 List all available debugging counters with their limits and counts.
1010 Common RejectNegative Joined Var(common_deferred_options) Defer
1011 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
1014 Common Joined RejectNegative Var(common_deferred_options) Defer
1015 Map one directory name to another in debug information
1017 fdebug-types-section
1018 Common Report Var(flag_debug_types_section) Init(0)
1019 Output .debug_types section when using DWARF v4 debuginfo.
1021 ; Nonzero for -fdefer-pop: don't pop args after each function call
1022 ; instead save them up to pop many calls' args with one insns.
1024 Common Report Var(flag_defer_pop) Optimization
1025 Defer popping functions args from stack until later
1028 Common Report Var(flag_delayed_branch) Optimization
1029 Attempt to fill delay slots of branch instructions
1031 fdelete-dead-exceptions
1032 Common Report Var(flag_delete_dead_exceptions) Init(0)
1033 Delete dead instructions that may throw exceptions
1035 fdelete-null-pointer-checks
1036 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
1037 Delete useless null pointer checks
1039 fdevirtualize-speculatively
1040 Common Report Var(flag_devirtualize_speculatively) Optimization
1041 Perform speculative devirtualization
1044 Common Report Var(flag_devirtualize) Optimization
1045 Try to convert virtual calls to direct ones.
1047 fdiagnostics-show-location=
1048 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1049 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
1051 ; Required for these enum values.
1056 Name(diagnostic_prefixing_rule) Type(int)
1059 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1062 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1064 fdiagnostics-show-caret
1065 Common Var(flag_diagnostics_show_caret) Init(1)
1066 Show the source line with a caret indicating the column
1069 Common Alias(fdiagnostics-color=,always,never)
1073 Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1074 -fdiagnostics-color=[never|always|auto] Colorize diagnostics
1076 ; Required for these enum values.
1081 Name(diagnostic_color_rule) Type(int)
1084 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1087 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1090 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1092 fdiagnostics-show-option
1093 Common Var(flag_diagnostics_show_option) Init(1)
1094 Amend appropriate diagnostic messages with the command line option that controls them
1097 Common Joined RejectNegative Var(common_deferred_options) Defer
1098 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1101 Common Joined RejectNegative Var(common_deferred_options) Defer
1102 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1105 Common Joined RejectNegative Var(common_deferred_options) Defer
1106 -fdump-<type> Dump various compiler internals to a file
1109 Driver RejectNegative
1112 Common RejectNegative Joined Var(flag_dump_final_insns)
1113 -fdump-final-insns=filename Dump to filename the insns at the end of translation
1116 Common RejectNegative Joined Var(flag_dump_go_spec)
1117 -fdump-go-spec=filename Write all declarations to file as Go code
1120 Common Report Var(flag_dump_noaddr)
1121 Suppress output of addresses in debugging dumps
1124 Common Driver Var(flag_report_bug)
1125 Collect and dump debug information into temporary file if ICE in C/C++
1129 Common Var(flag_dump_passes) Init(0)
1130 Dump optimization passes
1133 Common Report Var(flag_dump_unnumbered)
1134 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1136 fdump-unnumbered-links
1137 Common Report Var(flag_dump_unnumbered_links)
1138 Suppress output of previous and next insn numbers in debugging dumps
1141 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1142 Enable CFI tables via GAS assembler directives.
1145 Common Report Var(flag_early_inlining) Init(1) Optimization
1146 Perform early inlining
1148 feliminate-dwarf2-dups
1149 Common Report Var(flag_eliminate_dwarf2_dups)
1150 Perform DWARF2 duplicate elimination
1153 Common Report Var(flag_ipa_sra) Init(0) Optimization
1154 Perform interprocedural reduction of aggregates
1156 feliminate-unused-debug-symbols
1157 Common Report Var(flag_debug_only_used_symbols)
1158 Perform unused type elimination in debug info
1160 feliminate-unused-debug-types
1161 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1162 Perform unused type elimination in debug info
1164 femit-class-debug-always
1165 Common Report Var(flag_emit_class_debug_always) Init(0)
1166 Do not suppress C++ class debug information.
1169 Common Report Var(flag_exceptions) Optimization
1170 Enable exception handling
1172 fexpensive-optimizations
1173 Common Report Var(flag_expensive_optimizations) Optimization
1174 Perform a number of minor, expensive optimizations
1177 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1178 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1181 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1184 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1187 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1193 Common Var(flag_fat_lto_objects)
1194 Output lto objects containing both the intermediate language and binary output.
1197 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1198 Assume no NaNs or infinities are generated
1201 Common Joined RejectNegative Var(common_deferred_options) Defer
1202 -ffixed-<register> Mark <register> as being unavailable to the compiler
1205 Common Report Var(flag_float_store) Optimization
1206 Don't allocate floats and doubles in extended-precision registers
1210 Does nothing. Preserved for backward compatibility.
1213 Common Report Var(flag_forward_propagate) Optimization
1214 Perform a forward propagation pass on RTL
1217 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1218 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1221 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1224 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1226 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1228 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1231 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1233 ; Nonzero means don't put addresses of constant functions in registers.
1234 ; Used for compiling the Unix kernel, where strange substitutions are
1235 ; done on the assembly output.
1237 Common Report Var(flag_no_function_cse,0)
1238 Allow function addresses to be held in registers
1241 Common Report Var(flag_function_sections)
1242 Place each function into its own section
1245 Common Report Var(flag_gcse) Optimization
1246 Perform global common subexpression elimination
1249 Common Report Var(flag_gcse_lm) Init(1) Optimization
1250 Perform enhanced load motion during global common subexpression elimination
1253 Common Report Var(flag_gcse_sm) Init(0) Optimization
1254 Perform store motion after global common subexpression elimination
1257 Common Report Var(flag_gcse_las) Init(0) Optimization
1258 Perform redundant load after store elimination in global common subexpression
1262 Common Report Var(flag_gcse_after_reload) Optimization
1263 Perform global common subexpression elimination after register allocation
1266 ; This option is not documented yet as its semantics will change.
1268 Common Report Var(flag_graphite)
1269 Enable in and out of Graphite representation
1272 Common Report Var(flag_graphite_identity) Optimization
1273 Enable Graphite Identity transformation
1275 fgraphite-code-generator=
1276 Common Report RejectNegative Joined Optimization Enum(fgraphite_generator) Var(flag_graphite_code_gen) Init(FGRAPHITE_CODE_GEN_ISL)
1277 Choose code generator of Graphite
1280 Name(fgraphite_generator) Type(enum fgraphite_generator) UnknownError(unknown code generator of graphite %qs)
1283 Enum(fgraphite_generator) String(isl) Value(FGRAPHITE_CODE_GEN_ISL)
1286 Enum(fgraphite_generator) String(cloog) Value(FGRAPHITE_CODE_GEN_CLOOG)
1288 fhoist-adjacent-loads
1289 Common Report Var(flag_hoist_adjacent_loads) Optimization
1290 Enable hoisting adjacent loads to encourage generating conditional move
1293 floop-parallelize-all
1294 Common Report Var(flag_loop_parallelize_all) Optimization
1295 Mark all loops as parallel
1298 Common Report Var(flag_loop_strip_mine) Optimization
1299 Enable Loop Strip Mining transformation
1302 Common Report Var(flag_loop_interchange) Optimization
1303 Enable Loop Interchange transformation
1306 Common Report Var(flag_loop_block) Optimization
1307 Enable Loop Blocking transformation
1310 Common Report Var(flag_tm)
1311 Enable support for GNU transactional memory
1314 Common Report Var(flag_gnu_unique) Init(1)
1315 Use STB_GNU_UNIQUE if supported by the assembler
1319 Does nothing. Preserved for backward compatibility.
1322 Common Report Var(flag_loop_optimize_isl) Optimization
1323 Enable the ISL based loop nest optimizer
1325 fstrict-volatile-bitfields
1326 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1327 Force bitfield accesses to match their type width
1329 fguess-branch-probability
1330 Common Report Var(flag_guess_branch_prob) Optimization
1331 Enable guessing of branch probabilities
1333 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1334 ; Generate position-independent code for executables if possible
1335 ; On SVR4 targets, it also controls whether or not to emit a
1336 ; string identifying the compiler.
1338 Common Report Var(flag_no_ident,0)
1339 Process #ident directives
1342 Common Report Var(flag_if_conversion) Optimization
1343 Perform conversion of conditional jumps to branchless equivalents
1346 Common Report Var(flag_if_conversion2) Optimization
1347 Perform conversion of conditional jumps to conditional execution
1350 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1351 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1354 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1357 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1360 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1363 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1365 ftree-loop-if-convert
1366 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1367 Convert conditional jumps in innermost loops to branchless equivalents
1369 ftree-loop-if-convert-stores
1370 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1371 Also if-convert conditional jumps containing memory writes
1373 ; -finhibit-size-directive inhibits output of .size for ELF.
1374 ; This is used only for compiling crtstuff.c,
1375 ; and it may be extended to other effects
1376 ; needed for crtstuff.c on other systems.
1377 finhibit-size-directive
1378 Common Report Var(flag_inhibit_size_directive)
1379 Do not generate .size directives
1382 Common Report Var(flag_indirect_inlining)
1383 Perform indirect inlining
1385 ; General flag to enable inlining. Specifying -fno-inline will disable
1386 ; all inlining apart from always-inline functions.
1388 Common Report Var(flag_no_inline,0) Init(0) Optimization
1389 Enable inlining of function declared \"inline\", disabling disables all inlining
1391 finline-small-functions
1392 Common Report Var(flag_inline_small_functions) Optimization
1393 Integrate functions into their callers when code size is known not to grow
1396 Common Report Var(flag_inline_functions) Optimization
1397 Integrate functions not declared \"inline\" into their callers when profitable
1399 finline-functions-called-once
1400 Common Report Var(flag_inline_functions_called_once) Optimization
1401 Integrate functions only required by their single caller
1404 Common RejectNegative Joined Alias(finline-limit=)
1407 Common RejectNegative Joined UInteger
1408 -finline-limit=<number> Limit the size of inlined functions to <number>
1411 Common Report Var(flag_inline_atomics) Init(1) Optimization
1412 Inline __atomic operations when a lock free instruction sequence is available.
1414 finstrument-functions
1415 Common Report Var(flag_instrument_function_entry_exit)
1416 Instrument function entry and exit with profiling calls
1418 finstrument-functions-exclude-function-list=
1419 Common RejectNegative Joined
1420 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1422 finstrument-functions-exclude-file-list=
1423 Common RejectNegative Joined
1424 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1427 Common Report Var(flag_ipa_cp) Optimization
1428 Perform interprocedural constant propagation
1431 Common Report Var(flag_ipa_cp_clone) Optimization
1432 Perform cloning to make Interprocedural constant propagation stronger
1435 Common Report Var(flag_ipa_profile) Init(0) Optimization
1436 Perform interprocedural profile propagation
1439 Common Report Var(flag_ipa_pta) Init(0) Optimization
1440 Perform interprocedural points-to analysis
1443 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1444 Discover pure and const functions
1447 Common Report Var(flag_ipa_icf) Optimization
1448 Perform Identical Code Folding for functions and read-only variables
1451 Common Report Var(flag_ipa_icf_functions) Optimization
1452 Perform Identical Code Folding for functions
1455 Common Report Var(flag_ipa_icf_variables) Optimization
1456 Perform Identical Code Folding for variables
1459 Common Report Var(flag_ipa_reference) Init(0) Optimization
1460 Discover readonly and non addressable static variables
1464 Does nothing. Preserved for backward compatibility.
1468 Does nothing. Preserved for backward compatibility.
1471 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1472 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1475 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1478 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1481 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1484 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1485 -fira-region=[one|all|mixed] Set regions for IRA
1488 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1491 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1494 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1497 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1500 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1501 Use IRA based register pressure calculation
1502 in RTL hoist optimizations.
1505 Common Report Var(flag_ira_loop_pressure) Optimization
1506 Use IRA based register pressure calculation
1507 in RTL loop optimizations.
1509 fira-share-save-slots
1510 Common Report Var(flag_ira_share_save_slots) Init(1)
1511 Share slots for saving different hard registers.
1513 fira-share-spill-slots
1514 Common Report Var(flag_ira_share_spill_slots) Init(1)
1515 Share stack slots for spilled pseudo-registers.
1518 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1519 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1522 Common Report Var(flag_ivopts) Init(1) Optimization
1523 Optimize induction variables on trees
1526 Common Var(flag_jump_tables) Init(1) Optimization
1527 Use jump tables for sufficiently large switch statements
1529 fkeep-inline-functions
1530 Common Report Var(flag_keep_inline_functions)
1531 Generate code for functions even if they are fully inlined
1534 Common Report Var(flag_keep_static_consts) Init(1)
1535 Emit static const variables even if they are not used
1538 Common Report Var(flag_leading_underscore) Init(-1)
1539 Give external symbols a leading underscore
1543 Does nothing. Preserved for backward compatibility.
1547 Enable link-time optimization.
1550 Common RejectNegative Joined Var(flag_lto)
1551 Link-time optimization with number of parallel jobs or jobserver.
1554 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1557 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1560 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1563 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1566 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1569 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1572 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1573 Specify the algorithm to partition symbols and vars at linktime
1575 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1576 flto-compression-level=
1577 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1578 -flto-compression-level=<number> Use zlib compression level <number> for IL
1580 flto-odr-type-merging
1581 Common Report Var(flag_lto_odr_type_mering) Init(1)
1582 Merge C++ types using One Definition Rule
1585 Common Report Var(flag_lto_report) Init(0)
1586 Report various link-time optimization statistics
1589 Common Report Var(flag_lto_report_wpa) Init(0)
1590 Report various link-time optimization statistics for WPA only
1593 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1594 Set errno after built-in math functions
1597 Common Joined RejectNegative UInteger Var(flag_max_errors)
1598 -fmax-errors=<number> Maximum number of errors to report
1601 Common Report Var(mem_report)
1602 Report on permanent memory allocation
1605 Common Report Var(mem_report_wpa)
1606 Report on permanent memory allocation in WPA only
1608 ; This will attempt to merge constant section constants, if 1 only
1609 ; string constants and constants from constant pool, if 2 also constant
1611 fmerge-all-constants
1612 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1613 Attempt to merge identical constants and constant variables
1616 Common Report Var(flag_merge_constants,1) Optimization
1617 Attempt to merge identical constants across compilation units
1619 fmerge-debug-strings
1620 Common Report Var(flag_merge_debug_strings) Init(1)
1621 Attempt to merge identical debug strings across compilation units
1624 Common RejectNegative Joined UInteger
1625 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1628 Common Report Var(flag_modulo_sched) Optimization
1629 Perform SMS based modulo scheduling before the first scheduling pass
1631 fmodulo-sched-allow-regmoves
1632 Common Report Var(flag_modulo_sched_allow_regmoves)
1633 Perform SMS based modulo scheduling with register moves allowed
1635 fmove-loop-invariants
1636 Common Report Var(flag_move_loop_invariants) Optimization
1637 Move loop invariant computations out of loops
1640 Common Var(flag_dce) Init(1) Optimization
1641 Use the RTL dead code elimination pass
1644 Common Var(flag_dse) Init(1) Optimization
1645 Use the RTL dead store elimination pass
1647 freschedule-modulo-scheduled-loops
1648 Common Report Var(flag_resched_modulo_sched) Optimization
1649 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1651 fnon-call-exceptions
1652 Common Report Var(flag_non_call_exceptions) Optimization
1653 Support synchronous non-call exceptions
1656 Common Report Var(flag_omit_frame_pointer) Optimization
1657 When possible do not generate stack frames
1660 Common Report Var(flag_opt_info) Optimization
1661 Enable all optimization info dumps on stderr
1664 Common Joined RejectNegative Var(common_deferred_options) Defer
1665 -fopt-info[-<type>=filename] Dump compiler optimization details
1667 foptimize-register-move
1669 Does nothing. Preserved for backward compatibility.
1671 foptimize-sibling-calls
1672 Common Report Var(flag_optimize_sibling_calls) Optimization
1673 Optimize sibling and tail recursive calls
1676 Common Report Var(flag_partial_inlining)
1677 Perform partial inlining
1680 Common Report Var(pre_ipa_mem_report)
1681 Report on memory allocation before interprocedural optimization
1683 fpost-ipa-mem-report
1684 Common Report Var(post_ipa_mem_report)
1685 Report on memory allocation before interprocedural optimization
1688 Common Report Var(flag_pack_struct) Optimization
1689 Pack structure members together without holes
1692 Common RejectNegative Joined UInteger Optimization
1693 -fpack-struct=<number> Set initial maximum structure member alignment
1696 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1697 Return small aggregates in memory, not registers
1700 Common Report Var(flag_peel_loops) Optimization
1701 Perform loop peeling
1704 Common Report Var(flag_no_peephole,0) Optimization
1705 Enable machine specific peephole optimizations
1708 Common Report Var(flag_peephole2) Optimization
1709 Enable an RTL peephole pass before sched2
1712 Common Report Var(flag_pic,2) Negative(fPIE)
1713 Generate position-independent code if possible (large mode)
1716 Common Report Var(flag_pie,2) Negative(fpic)
1717 Generate position-independent code for executables if possible (large mode)
1720 Common Report Var(flag_pic,1) Negative(fpie)
1721 Generate position-independent code if possible (small mode)
1724 Common Report Var(flag_pie,1) Negative(fPIC)
1725 Generate position-independent code for executables if possible (small mode)
1728 Common Joined RejectNegative Var(common_deferred_options) Defer
1729 Specify a plugin to load
1732 Common Joined RejectNegative Var(common_deferred_options) Defer
1733 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1735 fpredictive-commoning
1736 Common Report Var(flag_predictive_commoning) Optimization
1737 Run predictive commoning optimization.
1739 fprefetch-loop-arrays
1740 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1741 Generate prefetch instructions, if available, for arrays in loops
1744 Common Report Var(profile_flag)
1745 Enable basic program profiling code
1748 Common Report Var(profile_arc_flag)
1749 Insert arc-based program profiling code
1752 Common Joined RejectNegative Var(profile_data_prefix)
1753 Set the top-level directory for storing the profile data.
1754 The default is 'pwd'.
1757 Common Report Var(flag_profile_correction)
1758 Enable correction of flow inconsistent profile data input
1762 Enable common options for generating profile info for profile feedback directed optimizations
1765 Common Joined RejectNegative
1766 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1769 Common Var(flag_profile_use)
1770 Enable common options for performing profile feedback directed optimizations
1773 Common Joined RejectNegative
1774 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1777 Common Report Var(flag_profile_values)
1778 Insert code to profile values of expressions
1781 Common Report Var(profile_report)
1782 Report on consistency of profile
1784 fprofile-reorder-functions
1785 Common Report Var(flag_profile_reorder_functions)
1786 Enable function reordering that improves code placement
1789 Common Var(common_deferred_options) Defer
1792 Common Joined RejectNegative Var(common_deferred_options) Defer
1793 -frandom-seed=<string> Make compile reproducible using <string>
1795 ; This switch causes the command line that was used to create an
1796 ; object file to be recorded into the object file. The exact format
1797 ; of this recording is target and binary file format dependent.
1798 ; It is related to the -fverbose-asm switch, but that switch only
1799 ; records information in the assembler output file as comments, so
1800 ; they never reach the object file.
1801 frecord-gcc-switches
1802 Common Report Var(flag_record_gcc_switches)
1803 Record gcc command line switches in the object file.
1806 Common Report Var(flag_pcc_struct_return,0) Optimization
1807 Return small aggregates in registers
1811 Does nothing. Preserved for backward compatibility.
1813 flive-range-shrinkage
1814 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
1815 Relief of register pressure through live range shrinkage
1818 Common Report Var(flag_rename_registers) Init(2) Optimization
1819 Perform a register renaming optimization pass
1822 Common Report Var(flag_reorder_blocks) Optimization
1823 Reorder basic blocks to improve code placement
1825 freorder-blocks-and-partition
1826 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1827 Reorder basic blocks and partition into hot and cold sections
1830 Common Report Var(flag_reorder_functions) Optimization
1831 Reorder functions to improve code placement
1833 frerun-cse-after-loop
1834 Common Report Var(flag_rerun_cse_after_loop) Optimization
1835 Add a common subexpression elimination pass after loop optimizations
1839 Does nothing. Preserved for backward compatibility.
1842 Common Report Var(flag_rounding_math) Optimization SetByCombined
1843 Disable optimizations that assume default FP rounding behavior
1846 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1847 Enable scheduling across basic blocks
1850 Common Report Var(flag_sched_pressure) Init(0) Optimization
1851 Enable register pressure sensitive insn scheduling
1854 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1855 Allow speculative motion of non-loads
1858 Common Report Var(flag_schedule_speculative_load) Optimization
1859 Allow speculative motion of some loads
1861 fsched-spec-load-dangerous
1862 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1863 Allow speculative motion of more loads
1866 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1867 -fsched-verbose=<number> Set the verbosity level of the scheduler
1869 fsched2-use-superblocks
1870 Common Report Var(flag_sched2_use_superblocks) Optimization
1871 If scheduling post reload, do superblock scheduling
1875 Does nothing. Preserved for backward compatibility.
1878 Common Report Var(flag_schedule_insns) Optimization
1879 Reschedule instructions before register allocation
1882 Common Report Var(flag_schedule_insns_after_reload) Optimization
1883 Reschedule instructions after register allocation
1885 ; This flag should be on when a target implements non-trivial
1886 ; scheduling hooks, maybe saving some information for its own sake.
1887 ; On IA64, for example, this is used for correct bundling.
1888 fselective-scheduling
1889 Common Report Var(flag_selective_scheduling) Optimization
1890 Schedule instructions using selective scheduling algorithm
1892 fselective-scheduling2
1893 Common Report Var(flag_selective_scheduling2) Optimization
1894 Run selective scheduling after reload
1896 fsel-sched-pipelining
1897 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1898 Perform software pipelining of inner loops during selective scheduling
1900 fsel-sched-pipelining-outer-loops
1901 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1902 Perform software pipelining of outer loops during selective scheduling
1904 fsel-sched-reschedule-pipelined
1905 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1906 Reschedule pipelined regions without pipelining
1908 fsemantic-interposition
1909 Common Report Var(flag_semantic_interposition) Init(1)
1910 Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker
1912 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1913 ; of stalled insns into the ready list.
1914 fsched-stalled-insns
1915 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1916 Allow premature scheduling of queued insns
1918 fsched-stalled-insns=
1919 Common RejectNegative Joined UInteger
1920 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1922 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1923 ; be examined for a dependency on a stalled insn that is candidate for
1924 ; premature removal from the queue of stalled insns into the ready list (has
1925 ; an effect only if the flag 'sched_stalled_insns' is set).
1926 fsched-stalled-insns-dep
1927 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1928 Set dependence distance checking in premature scheduling of queued insns
1930 fsched-stalled-insns-dep=
1931 Common RejectNegative Joined UInteger
1932 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1934 fsched-group-heuristic
1935 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1936 Enable the group heuristic in the scheduler
1938 fsched-critical-path-heuristic
1939 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1940 Enable the critical path heuristic in the scheduler
1942 fsched-spec-insn-heuristic
1943 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1944 Enable the speculative instruction heuristic in the scheduler
1946 fsched-rank-heuristic
1947 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1948 Enable the rank heuristic in the scheduler
1950 fsched-last-insn-heuristic
1951 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1952 Enable the last instruction heuristic in the scheduler
1954 fsched-dep-count-heuristic
1955 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1956 Enable the dependent count heuristic in the scheduler
1959 Common Report Var(flag_section_anchors) Optimization
1960 Access data in the same section from shared anchor points
1964 Does nothing. Preserved for backward compatibility.
1968 Does nothing. Preserved for backward compatibility.
1971 Common Report Var(flag_ree) Init(0)
1972 Turn on Redundant Extensions Elimination pass.
1975 Common Report Var(flag_show_column) Init(1)
1976 Show column numbers in diagnostics, when available. Default on
1979 Common Report Var(flag_shrink_wrap) Optimization
1980 Emit function prologues only before parts of the function that need it,
1981 rather than at the top of the function.
1984 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1985 Disable optimizations observable by IEEE signaling NaNs
1988 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1989 Disable floating point optimizations that ignore the IEEE signedness of zero
1991 fsingle-precision-constant
1992 Common Report Var(flag_single_precision_constant) Optimization
1993 Convert floating point constants to single precision constants
1995 fsplit-ivs-in-unroller
1996 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1997 Split lifetimes of induction variables when loops are unrolled
2000 Common Report Var(flag_split_stack) Init(-1)
2001 Generate discontiguous stack frames
2004 Common Report Var(flag_split_wide_types) Optimization
2005 Split wide types into independent registers
2008 Common Report Var(flag_ssa_phiopt) Optimization
2009 Optimize conditional patterns using SSA PHI nodes
2011 fvariable-expansion-in-unroller
2012 Common Report Var(flag_variable_expansion_in_unroller) Optimization
2013 Apply variable expansion when loops are unrolled
2016 Common Report RejectNegative Joined
2017 -fstack-check=[no|generic|specific] Insert stack checking code into the program
2020 Common Alias(fstack-check=, specific, no)
2021 Insert stack checking code into the program. Same as -fstack-check=specific
2024 Common Var(common_deferred_options) Defer
2026 fstack-limit-register=
2027 Common RejectNegative Joined Var(common_deferred_options) Defer
2028 -fstack-limit-register=<register> Trap if the stack goes past <register>
2030 fstack-limit-symbol=
2031 Common RejectNegative Joined Var(common_deferred_options) Defer
2032 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
2035 Common Report Var(flag_stack_protect, 1)
2036 Use propolice as a stack protection method
2038 fstack-protector-all
2039 Common Report RejectNegative Var(flag_stack_protect, 2)
2040 Use a stack protection method for every function
2042 fstack-protector-strong
2043 Common Report RejectNegative Var(flag_stack_protect, 3)
2044 Use a smart stack protection method for certain functions
2047 Common RejectNegative Var(flag_stack_usage)
2048 Output stack usage information on a per-function basis
2052 Does nothing. Preserved for backward compatibility.
2054 ; Nonzero if we should do (language-dependent) alias analysis.
2055 ; Typically, this analysis will assume that expressions of certain
2056 ; types do not alias expressions of certain other types. Only used
2057 ; if alias analysis (in general) is enabled.
2059 Common Report Var(flag_strict_aliasing) Optimization
2060 Assume strict aliasing rules apply
2063 Common Report Var(flag_strict_overflow)
2064 Treat signed overflow as undefined
2067 Common Report Var(flag_sync_libcalls) Init(1)
2068 Implement __atomic operations via libcalls to legacy __sync functions
2071 Common Report Var(flag_syntax_only)
2072 Check for syntax errors, then stop
2075 Common Report Var(flag_test_coverage)
2076 Create data files needed by \"gcov\"
2079 Common Report Var(flag_thread_jumps) Optimization
2080 Perform jump threading optimizations
2083 Common Report Var(time_report)
2084 Report the time taken by each compiler pass
2087 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2088 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
2091 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2094 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2097 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2100 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2103 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2106 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
2107 Reorder top level functions, variables, and asms
2110 Common Report Var(flag_tracer)
2111 Perform superblock formation via tail duplication
2113 ; Zero means that floating-point math operations cannot generate a
2114 ; (user-visible) trap. This is the case, for example, in nonstop
2115 ; IEEE 754 arithmetic.
2117 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2118 Assume floating-point operations can trap
2121 Common Report Var(flag_trapv) Optimization
2122 Trap for signed overflow in addition, subtraction and multiplication
2125 Common Report Var(flag_tree_ccp) Optimization
2126 Enable SSA-CCP optimization on trees
2129 Common Report Var(flag_tree_bit_ccp) Optimization
2130 Enable SSA-BIT-CCP optimization on trees
2134 Does nothing. Preserved for backward compatibility.
2137 Common Report Var(flag_tree_ch) Optimization
2138 Enable loop header copying on trees
2140 ftree-coalesce-inlined-vars
2141 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2142 Enable coalescing of copy-related user variables that are inlined
2145 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2146 Enable coalescing of all copy-related user variables
2149 Common Report Var(flag_tree_copyrename) Optimization
2150 Replace SSA temporaries with better names in copies
2153 Common Report Var(flag_tree_copy_prop) Optimization
2154 Enable copy propagation on trees
2156 ftree-store-copy-prop
2158 Does nothing. Preserved for backward compatibility.
2161 Common Report Var(flag_tree_cselim) Init(2) Optimization
2162 Transform condition stores into unconditional ones
2164 ftree-switch-conversion
2165 Common Report Var(flag_tree_switch_conversion) Optimization
2166 Perform conversions of switch initializations.
2169 Common Report Var(flag_tree_dce) Optimization
2170 Enable SSA dead code elimination optimization on trees
2172 ftree-dominator-opts
2173 Common Report Var(flag_tree_dom) Optimization
2174 Enable dominator optimizations
2177 Common Report Var(flag_tree_tail_merge) Optimization
2178 Enable tail merging on trees
2181 Common Report Var(flag_tree_dse) Optimization
2182 Enable dead store elimination
2185 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2186 Enable forward propagation on trees
2189 Common Report Var(flag_tree_fre) Optimization
2190 Enable Full Redundancy Elimination (FRE) on trees
2193 Common Report Var(flag_optimize_strlen) Optimization
2194 Enable string length optimizations on trees
2196 fisolate-erroneous-paths-dereference
2197 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2198 Detect paths which trigger erroneous or undefined behaviour due to
2199 dereferencing a NULL pointer. Isolate those paths from the main control
2200 flow and turn the statement with erroneous or undefined behaviour into a trap.
2202 fisolate-erroneous-paths-attribute
2203 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2204 Detect paths which trigger erroneous or undefined behaviour due a NULL value
2205 being used in a way which is forbidden by a returns_nonnull or nonnull
2206 attribute. Isolate those paths from the main control flow and turn the
2207 statement with erroneous or undefined behaviour into a trap.
2209 ftree-loop-distribution
2210 Common Report Var(flag_tree_loop_distribution) Optimization
2211 Enable loop distribution on trees
2213 ftree-loop-distribute-patterns
2214 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2215 Enable loop distribution for patterns transformed into a library call
2218 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2219 Enable loop invariant motion on trees
2222 Common Alias(floop-interchange)
2223 Enable loop interchange transforms. Same as -floop-interchange
2226 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2227 Create canonical induction variables in loops
2230 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2231 Enable loop optimizations on tree level
2233 ftree-parallelize-loops=
2234 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2235 Enable automatic parallelization of loops
2238 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2239 Enable hoisting loads from conditional pointers.
2242 Common Report Var(flag_tree_pre) Optimization
2243 Enable SSA-PRE optimization on trees
2246 Common Report Var(flag_tree_partial_pre) Optimization
2247 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2250 Common Report Var(flag_tree_pta) Optimization
2251 Perform function-local points-to analysis on trees.
2254 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2255 Enable reassociation on tree level
2259 Does nothing. Preserved for backward compatibility.
2262 Common Report Var(flag_tree_sink) Optimization
2263 Enable SSA code sinking on trees
2266 Common Report Var(flag_tree_slsr) Optimization
2267 Perform straight-line strength reduction
2270 Common Report Var(flag_tree_sra) Optimization
2271 Perform scalar replacement of aggregates
2274 Common Report Var(flag_tree_ter) Optimization
2275 Replace temporary expressions in the SSA->normal pass
2278 Common Report Var(flag_tree_live_range_split) Optimization
2279 Perform live range splitting during the SSA->normal pass
2282 Common Report Var(flag_tree_vrp) Init(0) Optimization
2283 Perform Value Range Propagation on trees
2286 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2287 Compile whole compilation unit at a time
2290 Common Report Var(flag_unroll_loops) Optimization
2291 Perform loop unrolling when iteration count is known
2294 Common Report Var(flag_unroll_all_loops) Optimization
2295 Perform loop unrolling for all loops
2297 ; Nonzero means that loop optimizer may assume that the induction variables
2298 ; that control loops do not overflow and that the loops with nontrivial
2299 ; exit condition are not infinite
2300 funsafe-loop-optimizations
2301 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2302 Allow loop optimizations to assume that the loops behave in normal way
2305 Common Report Var(flag_associative_math) SetByCombined
2306 Allow optimization for floating-point arithmetic which may change the
2307 result of the operation due to rounding.
2310 Common Report Var(flag_reciprocal_math) SetByCombined
2311 Same as -fassociative-math for expressions which include division.
2313 ; Nonzero means that unsafe floating-point math optimizations are allowed
2314 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2315 ; are allowed to assume that their arguments and results are "normal"
2316 ; (e.g., nonnegative for SQRT).
2317 funsafe-math-optimizations
2318 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2319 Allow math optimizations that may violate IEEE or ISO standards
2322 Common Report Var(flag_unswitch_loops) Optimization
2323 Perform loop unswitching
2326 Common Report Var(flag_unwind_tables) Optimization
2327 Just generate unwind tables for exception handling
2330 Common Driver Negative(fuse-ld=gold)
2331 Use the bfd linker instead of the default linker
2334 Common Driver Negative(fuse-ld=bfd)
2335 Use the gold linker instead of the default linker
2338 Common Undocumented Var(flag_use_linker_plugin)
2340 ; Positive if we should track variables, negative if we should run
2341 ; the var-tracking pass only to discard debug annotations, zero if
2342 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2343 ; will be set according to optimize, debug_info_level and debug_hooks
2344 ; in process_options ().
2346 Common Report Var(flag_var_tracking) Init(2) Optimization
2347 Perform variable tracking
2349 ; Positive if we should track variables at assignments, negative if
2350 ; we should run the var-tracking pass only to discard debug
2351 ; annotations. When flag_var_tracking_assignments ==
2352 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2353 fvar-tracking-assignments
2354 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2355 Perform variable tracking by annotating assignments
2357 ; Nonzero if we should toggle flag_var_tracking_assignments after
2358 ; processing options and computing its default. */
2359 fvar-tracking-assignments-toggle
2360 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2361 Toggle -fvar-tracking-assignments
2363 ; Positive if we should track uninitialized variables, negative if
2364 ; we should run the var-tracking pass only to discard debug
2365 ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
2366 ; will be set according to flag_var_tracking.
2367 fvar-tracking-uninit
2368 Common Report Var(flag_var_tracking_uninit) Optimization
2369 Perform variable tracking and also tag variables that are uninitialized
2372 Common Report Var(flag_tree_vectorize) Optimization
2373 Enable vectorization on trees
2375 ftree-vectorizer-verbose=
2376 Common Joined RejectNegative Ignore
2377 Does nothing. Preserved for backward compatibility.
2379 ftree-loop-vectorize
2380 Common Report Var(flag_tree_loop_vectorize) Optimization
2381 Enable loop vectorization on trees
2384 Common Report Var(flag_tree_slp_vectorize) Optimization
2385 Enable basic block vectorization (SLP) on trees
2388 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT)
2389 Specifies the cost model for vectorization
2392 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED)
2393 Specifies the vectorization cost model for code marked with a simd directive
2396 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2399 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2402 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2405 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2408 Common RejectNegative Alias(fvect-cost-model=,dynamic)
2409 Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
2412 Common RejectNegative Alias(fvect-cost-model=,unlimited)
2413 Enables the unlimited vectorizer cost model. Preserved for backward compatibility.
2415 ftree-vect-loop-version
2417 Does nothing. Preserved for backward compatibility.
2420 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2421 Enable copy propagation of scalar-evolution information.
2423 ; -fverbose-asm causes extra commentary information to be produced in
2424 ; the generated assembly code (to make it more readable). This option
2425 ; is generally only of use to those who actually need to read the
2426 ; generated assembly code (perhaps while debugging the compiler itself).
2427 ; -fno-verbose-asm, the default, causes the extra information
2428 ; to not be added and is useful when comparing two assembler files.
2430 Common Report Var(flag_verbose_asm)
2431 Add extra commentary to assembler output
2434 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2435 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2438 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2441 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2444 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2447 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2450 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2453 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2454 Validate vtable pointers before using them.
2457 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2460 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2463 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2466 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2469 Common Var(flag_vtv_counts)
2470 Output vtable verification counters.
2473 Common Var(flag_vtv_debug)
2474 Output vtable verification pointer sets information.
2477 Common Report Var(flag_value_profile_transformations) Optimization
2478 Use expression value profiles in optimizations
2481 Common Report Var(flag_web) Init(2) Optimization
2482 Construct webs and split unrelated uses of single variable
2484 ftree-builtin-call-dce
2485 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2486 Enable conditional dead code elimination for builtin calls
2489 Common Report Var(flag_whole_program) Init(0) Optimization
2490 Perform whole program optimizations
2493 Common Report Var(flag_wrapv) Optimization
2494 Assume signed arithmetic overflow wraps around
2496 fzero-initialized-in-bss
2497 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2498 Put zero initialized data in the bss section
2501 Common JoinedOrMissing
2502 Generate debug information in default format
2505 Common JoinedOrMissing Negative(gdwarf)
2506 Generate debug information in COFF format
2509 Common JoinedOrMissing Negative(gdwarf-)
2510 Generate debug information in default version of DWARF format
2513 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2514 Generate debug information in DWARF v2 (or later) format
2517 Common JoinedOrMissing
2518 Generate debug information in default extended format
2521 Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2522 Don't generate DWARF pubnames and pubtypes sections.
2525 Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2526 Generate DWARF pubnames and pubtypes sections.
2529 Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2530 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2532 gno-record-gcc-switches
2533 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2534 Don't record gcc command line switches in DWARF DW_AT_producer.
2536 grecord-gcc-switches
2537 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2538 Record gcc command line switches in DWARF DW_AT_producer.
2541 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2542 Don't generate debug information in separate .dwo files
2545 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2546 Generate debug information in separate .dwo files
2549 Common JoinedOrMissing Negative(gstabs+)
2550 Generate debug information in STABS format
2553 Common JoinedOrMissing Negative(gvms)
2554 Generate debug information in extended STABS format
2557 Common RejectNegative Var(dwarf_strict,0) Init(0)
2558 Emit DWARF additions beyond selected version
2561 Common Report RejectNegative Var(dwarf_strict,1)
2562 Don't emit DWARF additions beyond selected version
2565 Common Report Var(flag_gtoggle)
2566 Toggle debug information generation
2569 Common JoinedOrMissing Negative(gxcoff)
2570 Generate debug information in VMS format
2573 Common JoinedOrMissing Negative(gxcoff+)
2574 Generate debug information in XCOFF format
2577 Common JoinedOrMissing Negative(gcoff)
2578 Generate debug information in extended XCOFF format
2581 Name(compressed_debug_sections) Type(int)
2583 ; Since -gz= is completely handled in specs, the values aren't used and we
2584 ; assign arbitrary constants.
2586 Enum(compressed_debug_sections) String(none) Value(0)
2589 Enum(compressed_debug_sections) String(zlib) Value(1)
2592 Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
2596 Generate compressed debug sections
2599 Common Driver Joined Enum(compressed_debug_sections)
2600 -gz=<format> Generate compressed debug sections in format <format>
2603 Driver Joined Separate
2606 Common Joined Var(plugindir_string) Init(0)
2607 -iplugindir=<dir> Set <dir> to be the default plugin directory
2610 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2611 -imultiarch <dir> Set <dir> to be the multiarch include subdirectory
2614 Driver Joined Separate
2619 no-canonical-prefixes
2632 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2633 -o <file> Place output into <file>
2636 Common Var(profile_flag)
2637 Enable function profiling
2640 Driver Var(pass_exit_codes)
2643 Common Alias(Wpedantic)
2646 Common Var(flag_pedantic_errors)
2647 Like -pedantic but issue them as errors
2653 Driver Var(use_pipes)
2656 Driver JoinedOrMissing Var(print_file_name)
2658 print-libgcc-file-name
2661 print-multi-directory
2662 Driver Var(print_multi_directory)
2665 Driver Var(print_multi_lib)
2667 print-multi-os-directory
2668 Driver Var(print_multi_os_directory)
2671 Driver Var(print_multiarch)
2674 Driver JoinedOrMissing Var(print_prog_name)
2677 Driver Var(print_search_dirs)
2680 Driver Var(print_sysroot)
2682 print-sysroot-headers-suffix
2683 Driver Var(print_sysroot_headers_suffix)
2686 Common Var(quiet_flag) RejectDriver
2687 Do not display functions compiled or elapsed time
2705 Driver Var(report_times)
2708 Driver JoinedOrMissing
2711 Driver Joined Separate
2715 ; C option, but driver must not handle as "-u ndef".
2718 Common Driver Var(verbose_flag)
2719 Enable verbose output
2722 Common Var(version_flag) RejectDriver
2723 Display the compiler's version
2726 Common Var(inhibit_warnings)
2730 Driver Separate Var(wrapper_string)
2733 Driver Joined Separate
2736 Driver RejectNegative Negative(pie)
2737 Create a shared library
2743 Driver Separate Alias(specs=)
2756 ; Documented for Fortran, but always accepted by driver.
2763 ; Documented for Go, but always accepted by driver.
2781 Driver RejectNegative Negative(shared)
2782 Create a position independent executable
2785 Driver Joined Separate
2788 Common Report Var(flag_use_caller_save) Optimization
2789 Use caller save register across calls if possible
2791 ; This comment is to ensure we retain the blank line above.