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) 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_system_headers) Warning
656 Do not suppress warnings from system headers
659 Common Var(warn_trampolines) Warning
660 Warn whenever a trampoline is generated
663 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
664 Warn if a comparison is always true or always false due to the limited range of the data type
667 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
668 Warn about uninitialized automatic variables
671 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
672 Warn about maybe uninitialized automatic variables
676 Does nothing. Preserved for backward compatibility.
679 Common Var(warn_unused) Init(0) Warning
680 Enable all -Wunused- warnings
682 Wunused-but-set-parameter
683 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
684 Warn when a function parameter is only set, otherwise unused
686 Wunused-but-set-variable
687 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
688 Warn when a variable is only set, otherwise unused
691 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
692 Warn when a function is unused
695 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
696 Warn when a label is unused
699 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
700 Warn when a function parameter is unused
703 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
704 Warn when an expression value is unused
707 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
708 Warn when a variable is unused
711 Common Var(warn_coverage_mismatch) Init(1) Warning
712 Warn in case profiles in -fprofile-use do not match
714 Wvector-operation-performance
715 Common Var(warn_vector_operation_performance) Warning
716 Warn when a vector operation is compiled outside the SIMD
731 Common Separate Var(aux_info_file_name)
732 -aux-info <file> Emit declaration information into <file>
735 Common Joined Alias(aux-info)
738 Common Separate RejectDriver Var(aux_base_name)
741 Common Separate RejectDriver
751 -d<letters> Enable dumps from specific passes of the compiler
754 Common Separate Var(dump_base_name)
755 -dumpbase <file> Set the file basename to be used for dumps
758 Common Separate Var(dump_dir_name)
759 -dumpdir <dir> Set the directory name to be used for dumps
771 Driver Joined Separate
773 ; This option has historically been passed down to the linker by an
774 ; accident of a %{e*} spec, so ensure it continues to be passed down
775 ; as a single option. The supported option for this purpose is
776 ; -rdynamic. See PR 47390.
780 ; The version of the C++ ABI in use. The following values are allowed:
782 ; 0: The version of the ABI believed most conformant with the C++ ABI
783 ; specification. This ABI may change as bugs are discovered and fixed.
784 ; Therefore, 0 will not necessarily indicate the same ABI in different
787 ; 1: The version of the ABI first used in G++ 3.2. No longer selectable.
789 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
791 ; 3: The version of the ABI that fixes the missing underscore
792 ; in template non-type arguments of pointer type.
794 ; 4: The version of the ABI that introduces unambiguous mangling of
795 ; vector types. First selectable in G++ 4.5.
797 ; 5: The version of the ABI that ignores attribute const/noreturn
798 ; in function pointer mangling, and corrects mangling of decltype and
799 ; function parameters used in other parameters and the return type.
800 ; First selectable in G++ 4.6.
802 ; 6: The version of the ABI that doesn't promote scoped enums to int and
803 ; changes the mangling of template argument packs, const/static_cast,
804 ; prefix ++ and --, and a class scope function used as a template
806 ; First selectable in G++ 4.7.
808 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
809 ; corrects the mangling of lambdas in default argument scope.
810 ; First selectable in G++ 4.8.
812 ; 8: The version of the ABI that corrects the substitution behavior of
813 ; function types with function-cv-qualifiers.
814 ; First selectable in G++ 4.9.
816 ; Additional positive integers will be assigned as new versions of
817 ; the ABI become the default version of the ABI.
819 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(0)
820 The version of the C++ ABI in use
822 faggressive-loop-optimizations
823 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
824 Aggressively optimize loops using language constraints
827 Common Report Var(align_functions,0) Optimization UInteger
828 Align the start of functions
831 Common RejectNegative Joined UInteger Var(align_functions)
834 Common Report Var(align_jumps,0) Optimization UInteger
835 Align labels which are only reached by jumping
838 Common RejectNegative Joined UInteger Var(align_jumps)
841 Common Report Var(align_labels,0) Optimization UInteger
845 Common RejectNegative Joined UInteger Var(align_labels)
848 Common Report Var(align_loops,0) Optimization UInteger
849 Align the start of loops
852 Common RejectNegative Joined UInteger Var(align_loops)
856 Does nothing. Preserved for backward compatibility.
860 Does nothing. Preserved for backward compatibility.
862 fargument-noalias-global
864 Does nothing. Preserved for backward compatibility.
866 fargument-noalias-anything
868 Does nothing. Preserved for backward compatibility.
871 Common Driver Report Joined
872 Select what to sanitize
875 Common Report Var(flag_sanitize_recover) Init(1)
876 After diagnosing undefined behavior attempt to continue execution
878 fsanitize-undefined-trap-on-error
879 Common Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
880 Use trap instead of a library function for undefined behavior sanitization
882 fasynchronous-unwind-tables
883 Common Report Var(flag_asynchronous_unwind_tables) Optimization
884 Generate unwind tables that are exact at each instruction boundary
887 Common Report Var(flag_auto_inc_dec) Init(1)
888 Generate auto-inc/dec instructions
890 ; -fcheck-bounds causes gcc to generate array bounds checks.
891 ; For C, C++ and ObjC: defaults off.
892 ; For Java: defaults to on.
893 ; For Fortran: defaults to off.
895 Common Report Var(flag_bounds_check)
896 Generate code to check bounds before indexing arrays
899 Common Report Var(flag_branch_on_count_reg) Optimization
900 Replace add, compare, branch with branch on count register
902 fbranch-probabilities
903 Common Report Var(flag_branch_probabilities) Optimization
904 Use profiling information for branch probabilities
906 fbranch-target-load-optimize
907 Common Report Var(flag_branch_target_load_optimize) Optimization
908 Perform branch target load optimization before prologue / epilogue threading
910 fbranch-target-load-optimize2
911 Common Report Var(flag_branch_target_load_optimize2) Optimization
912 Perform branch target load optimization after prologue / epilogue threading
915 Common Report Var(flag_btr_bb_exclusive) Optimization
916 Restrict target load migration not to re-use registers in any basic block
919 Common Joined RejectNegative Var(common_deferred_options) Defer
920 -fcall-saved-<register> Mark <register> as being preserved across functions
923 Common Joined RejectNegative Var(common_deferred_options) Defer
924 -fcall-used-<register> Mark <register> as being corrupted by function calls
926 ; Nonzero for -fcaller-saves: allocate values in regs that need to
927 ; be saved across function calls, if that produces overall better code.
928 ; Optional now, so people can test it.
930 Common Report Var(flag_caller_saves) Optimization
931 Save registers around function calls
934 Common Report Var(flag_check_data_deps)
935 Compare the results of several data dependence analyzers.
938 Common Var(flag_check_new)
939 Check the return value of new in C++
941 fcombine-stack-adjustments
942 Common Report Var(flag_combine_stack_adjustments) Optimization
943 Looks for opportunities to reduce stack adjustments and stack references.
946 Common Report Var(flag_no_common,0) Optimization
947 Do not put uninitialized globals in the common section
951 ; Converted by the driver to -fcompare-debug= options.
954 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
955 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
957 fcompare-debug-second
958 Common Driver RejectNegative Var(flag_compare_debug)
959 Run only the second compilation of -fcompare-debug
962 Common Report Var(flag_compare_elim_after_reload) Optimization
963 Perform comparison elimination after register allocation has finished
966 Common Var(flag_conserve_stack) Optimization
967 Do not perform optimizations increasing noticeably stack usage
970 Common Report Var(flag_cprop_registers) Optimization
971 Perform a register copy-propagation optimization pass
974 Common Report Var(flag_crossjumping) Optimization
975 Perform cross-jumping optimization
978 Common Report Var(flag_cse_follow_jumps) Optimization
979 When running CSE, follow jumps to their targets
983 Does nothing. Preserved for backward compatibility.
986 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
987 Omit range reduction step when performing complex division
990 Common Report Var(flag_cx_fortran_rules) Optimization
991 Complex multiplication and division follow Fortran rules
994 Common Report Var(flag_data_sections) Optimization
995 Place data items into their own section
998 Common Report Var(common_deferred_options) Defer
999 List all available debugging counters with their limits and counts.
1002 Common RejectNegative Joined Var(common_deferred_options) Defer
1003 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
1006 Common Joined RejectNegative Var(common_deferred_options) Defer
1007 Map one directory name to another in debug information
1009 fdebug-types-section
1010 Common Report Var(flag_debug_types_section) Init(0)
1011 Output .debug_types section when using DWARF v4 debuginfo.
1013 ; Nonzero for -fdefer-pop: don't pop args after each function call
1014 ; instead save them up to pop many calls' args with one insns.
1016 Common Report Var(flag_defer_pop) Optimization
1017 Defer popping functions args from stack until later
1020 Common Report Var(flag_delayed_branch) Optimization
1021 Attempt to fill delay slots of branch instructions
1023 fdelete-dead-exceptions
1024 Common Report Var(flag_delete_dead_exceptions) Init(0)
1025 Delete dead instructions that may throw exceptions
1027 fdelete-null-pointer-checks
1028 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
1029 Delete useless null pointer checks
1031 fdevirtualize-speculatively
1032 Common Report Var(flag_devirtualize_speculatively) Optimization
1033 Perform speculative devirtualization
1036 Common Report Var(flag_devirtualize) Optimization
1037 Try to convert virtual calls to direct ones.
1039 fdiagnostics-show-location=
1040 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1041 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
1043 ; Required for these enum values.
1048 Name(diagnostic_prefixing_rule) Type(int)
1051 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1054 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1056 fdiagnostics-show-caret
1057 Common Var(flag_diagnostics_show_caret) Init(1)
1058 Show the source line with a caret indicating the column
1061 Common Alias(fdiagnostics-color=,always,never)
1065 Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1066 -fdiagnostics-color=[never|always|auto] Colorize diagnostics
1068 ; Required for these enum values.
1073 Name(diagnostic_color_rule) Type(int)
1076 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1079 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1082 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1084 fdiagnostics-show-option
1085 Common Var(flag_diagnostics_show_option) Init(1)
1086 Amend appropriate diagnostic messages with the command line option that controls them
1089 Common Joined RejectNegative Var(common_deferred_options) Defer
1090 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1093 Common Joined RejectNegative Var(common_deferred_options) Defer
1094 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1097 Common Joined RejectNegative Var(common_deferred_options) Defer
1098 -fdump-<type> Dump various compiler internals to a file
1101 Driver RejectNegative
1104 Common RejectNegative Joined Var(flag_dump_final_insns)
1105 -fdump-final-insns=filename Dump to filename the insns at the end of translation
1108 Common RejectNegative Joined Var(flag_dump_go_spec)
1109 -fdump-go-spec=filename Write all declarations to file as Go code
1112 Common Report Var(flag_dump_noaddr)
1113 Suppress output of addresses in debugging dumps
1116 Common Var(flag_dump_passes) Init(0)
1117 Dump optimization passes
1120 Common Report Var(flag_dump_unnumbered)
1121 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1123 fdump-unnumbered-links
1124 Common Report Var(flag_dump_unnumbered_links)
1125 Suppress output of previous and next insn numbers in debugging dumps
1128 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1129 Enable CFI tables via GAS assembler directives.
1132 Common Report Var(flag_early_inlining) Init(1) Optimization
1133 Perform early inlining
1135 feliminate-dwarf2-dups
1136 Common Report Var(flag_eliminate_dwarf2_dups)
1137 Perform DWARF2 duplicate elimination
1140 Common Report Var(flag_ipa_sra) Init(0) Optimization
1141 Perform interprocedural reduction of aggregates
1143 feliminate-unused-debug-symbols
1144 Common Report Var(flag_debug_only_used_symbols)
1145 Perform unused type elimination in debug info
1147 feliminate-unused-debug-types
1148 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1149 Perform unused type elimination in debug info
1151 femit-class-debug-always
1152 Common Report Var(flag_emit_class_debug_always) Init(0)
1153 Do not suppress C++ class debug information.
1156 Common Report Var(flag_exceptions) Optimization
1157 Enable exception handling
1159 fexpensive-optimizations
1160 Common Report Var(flag_expensive_optimizations) Optimization
1161 Perform a number of minor, expensive optimizations
1164 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1165 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1168 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1171 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1174 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1180 Common Var(flag_fat_lto_objects)
1181 Output lto objects containing both the intermediate language and binary output.
1184 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1185 Assume no NaNs or infinities are generated
1188 Common Joined RejectNegative Var(common_deferred_options) Defer
1189 -ffixed-<register> Mark <register> as being unavailable to the compiler
1192 Common Report Var(flag_float_store) Optimization
1193 Don't allocate floats and doubles in extended-precision registers
1197 Does nothing. Preserved for backward compatibility.
1200 Common Report Var(flag_forward_propagate) Optimization
1201 Perform a forward propagation pass on RTL
1204 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1205 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1208 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1211 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1213 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1215 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1218 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1220 ; Nonzero means don't put addresses of constant functions in registers.
1221 ; Used for compiling the Unix kernel, where strange substitutions are
1222 ; done on the assembly output.
1224 Common Report Var(flag_no_function_cse,0)
1225 Allow function addresses to be held in registers
1228 Common Report Var(flag_function_sections)
1229 Place each function into its own section
1232 Common Report Var(flag_gcse) Optimization
1233 Perform global common subexpression elimination
1236 Common Report Var(flag_gcse_lm) Init(1) Optimization
1237 Perform enhanced load motion during global common subexpression elimination
1240 Common Report Var(flag_gcse_sm) Init(0) Optimization
1241 Perform store motion after global common subexpression elimination
1244 Common Report Var(flag_gcse_las) Init(0) Optimization
1245 Perform redundant load after store elimination in global common subexpression
1249 Common Report Var(flag_gcse_after_reload) Optimization
1250 Perform global common subexpression elimination after register allocation
1253 ; This option is not documented yet as its semantics will change.
1255 Common Report Var(flag_graphite)
1256 Enable in and out of Graphite representation
1259 Common Report Var(flag_graphite_identity) Optimization
1260 Enable Graphite Identity transformation
1262 fgraphite-code-generator=
1263 Common Report RejectNegative Joined Optimization Enum(fgraphite_generator) Var(flag_graphite_code_gen) Init(FGRAPHITE_CODE_GEN_CLOOG)
1264 Choose code generator of Graphite
1267 Name(fgraphite_generator) Type(enum fgraphite_generator) UnknownError(unknown code generator of graphite %qs)
1270 Enum(fgraphite_generator) String(isl) Value(FGRAPHITE_CODE_GEN_ISL)
1273 Enum(fgraphite_generator) String(cloog) Value(FGRAPHITE_CODE_GEN_CLOOG)
1275 fhoist-adjacent-loads
1276 Common Report Var(flag_hoist_adjacent_loads) Optimization
1277 Enable hoisting adjacent loads to encourage generating conditional move
1280 floop-parallelize-all
1281 Common Report Var(flag_loop_parallelize_all) Optimization
1282 Mark all loops as parallel
1285 Common Report Var(flag_loop_strip_mine) Optimization
1286 Enable Loop Strip Mining transformation
1289 Common Report Var(flag_loop_interchange) Optimization
1290 Enable Loop Interchange transformation
1293 Common Report Var(flag_loop_block) Optimization
1294 Enable Loop Blocking transformation
1297 Common Report Var(flag_tm)
1298 Enable support for GNU transactional memory
1301 Common Report Var(flag_gnu_unique) Init(1)
1302 Use STB_GNU_UNIQUE if supported by the assembler
1306 Does nothing. Preserved for backward compatibility.
1309 Common Report Var(flag_loop_optimize_isl) Optimization
1310 Enable the ISL based loop nest optimizer
1312 fstrict-volatile-bitfields
1313 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1314 Force bitfield accesses to match their type width
1316 fguess-branch-probability
1317 Common Report Var(flag_guess_branch_prob) Optimization
1318 Enable guessing of branch probabilities
1320 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1321 ; Generate position-independent code for executables if possible
1322 ; On SVR4 targets, it also controls whether or not to emit a
1323 ; string identifying the compiler.
1325 Common Report Var(flag_no_ident,0)
1326 Process #ident directives
1329 Common Report Var(flag_if_conversion) Optimization
1330 Perform conversion of conditional jumps to branchless equivalents
1333 Common Report Var(flag_if_conversion2) Optimization
1334 Perform conversion of conditional jumps to conditional execution
1337 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1338 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1341 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1344 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1347 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1350 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1352 ftree-loop-if-convert
1353 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1354 Convert conditional jumps in innermost loops to branchless equivalents
1356 ftree-loop-if-convert-stores
1357 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1358 Also if-convert conditional jumps containing memory writes
1360 ; -finhibit-size-directive inhibits output of .size for ELF.
1361 ; This is used only for compiling crtstuff.c,
1362 ; and it may be extended to other effects
1363 ; needed for crtstuff.c on other systems.
1364 finhibit-size-directive
1365 Common Report Var(flag_inhibit_size_directive)
1366 Do not generate .size directives
1369 Common Report Var(flag_indirect_inlining)
1370 Perform indirect inlining
1372 ; General flag to enable inlining. Specifying -fno-inline will disable
1373 ; all inlining apart from always-inline functions.
1375 Common Report Var(flag_no_inline,0) Init(0) Optimization
1376 Enable inlining of function declared \"inline\", disabling disables all inlining
1378 finline-small-functions
1379 Common Report Var(flag_inline_small_functions) Optimization
1380 Integrate functions into their callers when code size is known not to grow
1383 Common Report Var(flag_inline_functions) Optimization
1384 Integrate functions not declared \"inline\" into their callers when profitable
1386 finline-functions-called-once
1387 Common Report Var(flag_inline_functions_called_once) Optimization
1388 Integrate functions only required by their single caller
1391 Common RejectNegative Joined Alias(finline-limit=)
1394 Common RejectNegative Joined UInteger
1395 -finline-limit=<number> Limit the size of inlined functions to <number>
1398 Common Report Var(flag_inline_atomics) Init(1) Optimization
1399 Inline __atomic operations when a lock free instruction sequence is available.
1401 finstrument-functions
1402 Common Report Var(flag_instrument_function_entry_exit)
1403 Instrument function entry and exit with profiling calls
1405 finstrument-functions-exclude-function-list=
1406 Common RejectNegative Joined
1407 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1409 finstrument-functions-exclude-file-list=
1410 Common RejectNegative Joined
1411 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1414 Common Report Var(flag_ipa_cp) Optimization
1415 Perform interprocedural constant propagation
1418 Common Report Var(flag_ipa_cp_clone) Optimization
1419 Perform cloning to make Interprocedural constant propagation stronger
1422 Common Report Var(flag_ipa_profile) Init(0) Optimization
1423 Perform interprocedural profile propagation
1426 Common Report Var(flag_ipa_pta) Init(0) Optimization
1427 Perform interprocedural points-to analysis
1430 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1431 Discover pure and const functions
1434 Common Report Var(flag_ipa_reference) Init(0) Optimization
1435 Discover readonly and non addressable static variables
1439 Does nothing. Preserved for backward compatibility.
1443 Does nothing. Preserved for backward compatibility.
1446 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1447 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1450 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1453 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1456 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1459 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1460 -fira-region=[one|all|mixed] Set regions for IRA
1463 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1466 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1469 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1472 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1475 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1476 Use IRA based register pressure calculation
1477 in RTL hoist optimizations.
1480 Common Report Var(flag_ira_loop_pressure) Optimization
1481 Use IRA based register pressure calculation
1482 in RTL loop optimizations.
1484 fira-share-save-slots
1485 Common Report Var(flag_ira_share_save_slots) Init(1)
1486 Share slots for saving different hard registers.
1488 fira-share-spill-slots
1489 Common Report Var(flag_ira_share_spill_slots) Init(1)
1490 Share stack slots for spilled pseudo-registers.
1493 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1494 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1497 Common Report Var(flag_ivopts) Init(1) Optimization
1498 Optimize induction variables on trees
1501 Common Var(flag_jump_tables) Init(1) Optimization
1502 Use jump tables for sufficiently large switch statements
1504 fkeep-inline-functions
1505 Common Report Var(flag_keep_inline_functions)
1506 Generate code for functions even if they are fully inlined
1509 Common Report Var(flag_keep_static_consts) Init(1)
1510 Emit static const variables even if they are not used
1513 Common Report Var(flag_leading_underscore) Init(-1)
1514 Give external symbols a leading underscore
1518 Does nothing. Preserved for backward compatibility.
1522 Enable link-time optimization.
1525 Common RejectNegative Joined Var(flag_lto)
1526 Link-time optimization with number of parallel jobs or jobserver.
1529 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1532 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1535 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1538 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1541 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1544 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1547 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1548 Specify the algorithm to partition symbols and vars at linktime
1550 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1551 flto-compression-level=
1552 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1553 -flto-compression-level=<number> Use zlib compression level <number> for IL
1556 Common Report Var(flag_lto_report) Init(0)
1557 Report various link-time optimization statistics
1560 Common Report Var(flag_lto_report_wpa) Init(0)
1561 Report various link-time optimization statistics for WPA only
1564 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1565 Set errno after built-in math functions
1568 Common Joined RejectNegative UInteger Var(flag_max_errors)
1569 -fmax-errors=<number> Maximum number of errors to report
1572 Common Report Var(mem_report)
1573 Report on permanent memory allocation
1576 Common Report Var(mem_report_wpa)
1577 Report on permanent memory allocation in WPA only
1579 ; This will attempt to merge constant section constants, if 1 only
1580 ; string constants and constants from constant pool, if 2 also constant
1582 fmerge-all-constants
1583 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1584 Attempt to merge identical constants and constant variables
1587 Common Report Var(flag_merge_constants,1) Optimization
1588 Attempt to merge identical constants across compilation units
1590 fmerge-debug-strings
1591 Common Report Var(flag_merge_debug_strings) Init(1)
1592 Attempt to merge identical debug strings across compilation units
1595 Common RejectNegative Joined UInteger
1596 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1599 Common Report Var(flag_modulo_sched) Optimization
1600 Perform SMS based modulo scheduling before the first scheduling pass
1602 fmodulo-sched-allow-regmoves
1603 Common Report Var(flag_modulo_sched_allow_regmoves)
1604 Perform SMS based modulo scheduling with register moves allowed
1606 fmove-loop-invariants
1607 Common Report Var(flag_move_loop_invariants) Optimization
1608 Move loop invariant computations out of loops
1611 Common Var(flag_dce) Init(1) Optimization
1612 Use the RTL dead code elimination pass
1615 Common Var(flag_dse) Init(1) Optimization
1616 Use the RTL dead store elimination pass
1618 freschedule-modulo-scheduled-loops
1619 Common Report Var(flag_resched_modulo_sched) Optimization
1620 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1622 fnon-call-exceptions
1623 Common Report Var(flag_non_call_exceptions) Optimization
1624 Support synchronous non-call exceptions
1627 Common Report Var(flag_omit_frame_pointer) Optimization
1628 When possible do not generate stack frames
1631 Common Report Var(flag_opt_info) Optimization
1632 Enable all optimization info dumps on stderr
1635 Common Joined RejectNegative Var(common_deferred_options) Defer
1636 -fopt-info[-<type>=filename] Dump compiler optimization details
1638 foptimize-register-move
1640 Does nothing. Preserved for backward compatibility.
1642 foptimize-sibling-calls
1643 Common Report Var(flag_optimize_sibling_calls) Optimization
1644 Optimize sibling and tail recursive calls
1647 Common Report Var(flag_partial_inlining)
1648 Perform partial inlining
1651 Common Report Var(pre_ipa_mem_report)
1652 Report on memory allocation before interprocedural optimization
1654 fpost-ipa-mem-report
1655 Common Report Var(post_ipa_mem_report)
1656 Report on memory allocation before interprocedural optimization
1659 Common Report Var(flag_pack_struct) Optimization
1660 Pack structure members together without holes
1663 Common RejectNegative Joined UInteger Optimization
1664 -fpack-struct=<number> Set initial maximum structure member alignment
1667 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1668 Return small aggregates in memory, not registers
1671 Common Report Var(flag_peel_loops) Optimization
1672 Perform loop peeling
1675 Common Report Var(flag_no_peephole,0) Optimization
1676 Enable machine specific peephole optimizations
1679 Common Report Var(flag_peephole2) Optimization
1680 Enable an RTL peephole pass before sched2
1683 Common Report Var(flag_pic,2) Negative(fPIE)
1684 Generate position-independent code if possible (large mode)
1687 Common Report Var(flag_pie,2) Negative(fpic)
1688 Generate position-independent code for executables if possible (large mode)
1691 Common Report Var(flag_pic,1) Negative(fpie)
1692 Generate position-independent code if possible (small mode)
1695 Common Report Var(flag_pie,1) Negative(fPIC)
1696 Generate position-independent code for executables if possible (small mode)
1699 Common Joined RejectNegative Var(common_deferred_options) Defer
1700 Specify a plugin to load
1703 Common Joined RejectNegative Var(common_deferred_options) Defer
1704 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1706 fpredictive-commoning
1707 Common Report Var(flag_predictive_commoning) Optimization
1708 Run predictive commoning optimization.
1710 fprefetch-loop-arrays
1711 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1712 Generate prefetch instructions, if available, for arrays in loops
1715 Common Report Var(profile_flag)
1716 Enable basic program profiling code
1719 Common Report Var(profile_arc_flag)
1720 Insert arc-based program profiling code
1723 Common Joined RejectNegative Var(profile_data_prefix)
1724 Set the top-level directory for storing the profile data.
1725 The default is 'pwd'.
1728 Common Report Var(flag_profile_correction)
1729 Enable correction of flow inconsistent profile data input
1733 Enable common options for generating profile info for profile feedback directed optimizations
1736 Common Joined RejectNegative
1737 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1740 Common Var(flag_profile_use)
1741 Enable common options for performing profile feedback directed optimizations
1744 Common Joined RejectNegative
1745 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1748 Common Report Var(flag_profile_values)
1749 Insert code to profile values of expressions
1752 Common Report Var(profile_report)
1753 Report on consistency of profile
1755 fprofile-reorder-functions
1756 Common Report Var(flag_profile_reorder_functions)
1757 Enable function reordering that improves code placement
1760 Common Var(common_deferred_options) Defer
1763 Common Joined RejectNegative Var(common_deferred_options) Defer
1764 -frandom-seed=<string> Make compile reproducible using <string>
1766 ; This switch causes the command line that was used to create an
1767 ; object file to be recorded into the object file. The exact format
1768 ; of this recording is target and binary file format dependent.
1769 ; It is related to the -fverbose-asm switch, but that switch only
1770 ; records information in the assembler output file as comments, so
1771 ; they never reach the object file.
1772 frecord-gcc-switches
1773 Common Report Var(flag_record_gcc_switches)
1774 Record gcc command line switches in the object file.
1777 Common Report Var(flag_pcc_struct_return,0) Optimization
1778 Return small aggregates in registers
1782 Does nothing. Preserved for backward compatibility.
1784 flive-range-shrinkage
1785 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
1786 Relief of register pressure through live range shrinkage
1789 Common Report Var(flag_rename_registers) Init(2) Optimization
1790 Perform a register renaming optimization pass
1793 Common Report Var(flag_reorder_blocks) Optimization
1794 Reorder basic blocks to improve code placement
1796 freorder-blocks-and-partition
1797 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1798 Reorder basic blocks and partition into hot and cold sections
1801 Common Report Var(flag_reorder_functions) Optimization
1802 Reorder functions to improve code placement
1804 frerun-cse-after-loop
1805 Common Report Var(flag_rerun_cse_after_loop) Optimization
1806 Add a common subexpression elimination pass after loop optimizations
1810 Does nothing. Preserved for backward compatibility.
1813 Common Report Var(flag_rounding_math) Optimization SetByCombined
1814 Disable optimizations that assume default FP rounding behavior
1817 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1818 Enable scheduling across basic blocks
1821 Common Report Var(flag_sched_pressure) Init(0) Optimization
1822 Enable register pressure sensitive insn scheduling
1825 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1826 Allow speculative motion of non-loads
1829 Common Report Var(flag_schedule_speculative_load) Optimization
1830 Allow speculative motion of some loads
1832 fsched-spec-load-dangerous
1833 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1834 Allow speculative motion of more loads
1837 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1838 -fsched-verbose=<number> Set the verbosity level of the scheduler
1840 fsched2-use-superblocks
1841 Common Report Var(flag_sched2_use_superblocks) Optimization
1842 If scheduling post reload, do superblock scheduling
1846 Does nothing. Preserved for backward compatibility.
1849 Common Report Var(flag_schedule_insns) Optimization
1850 Reschedule instructions before register allocation
1853 Common Report Var(flag_schedule_insns_after_reload) Optimization
1854 Reschedule instructions after register allocation
1856 ; This flag should be on when a target implements non-trivial
1857 ; scheduling hooks, maybe saving some information for its own sake.
1858 ; On IA64, for example, this is used for correct bundling.
1859 fselective-scheduling
1860 Common Report Var(flag_selective_scheduling) Optimization
1861 Schedule instructions using selective scheduling algorithm
1863 fselective-scheduling2
1864 Common Report Var(flag_selective_scheduling2) Optimization
1865 Run selective scheduling after reload
1867 fsel-sched-pipelining
1868 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1869 Perform software pipelining of inner loops during selective scheduling
1871 fsel-sched-pipelining-outer-loops
1872 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1873 Perform software pipelining of outer loops during selective scheduling
1875 fsel-sched-reschedule-pipelined
1876 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1877 Reschedule pipelined regions without pipelining
1879 fsemantic-interposition
1880 Common Report Var(flag_semantic_interposition) Init(1)
1881 Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker
1883 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1884 ; of stalled insns into the ready list.
1885 fsched-stalled-insns
1886 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1887 Allow premature scheduling of queued insns
1889 fsched-stalled-insns=
1890 Common RejectNegative Joined UInteger
1891 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1893 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1894 ; be examined for a dependency on a stalled insn that is candidate for
1895 ; premature removal from the queue of stalled insns into the ready list (has
1896 ; an effect only if the flag 'sched_stalled_insns' is set).
1897 fsched-stalled-insns-dep
1898 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1899 Set dependence distance checking in premature scheduling of queued insns
1901 fsched-stalled-insns-dep=
1902 Common RejectNegative Joined UInteger
1903 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1905 fsched-group-heuristic
1906 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1907 Enable the group heuristic in the scheduler
1909 fsched-critical-path-heuristic
1910 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1911 Enable the critical path heuristic in the scheduler
1913 fsched-spec-insn-heuristic
1914 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1915 Enable the speculative instruction heuristic in the scheduler
1917 fsched-rank-heuristic
1918 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1919 Enable the rank heuristic in the scheduler
1921 fsched-last-insn-heuristic
1922 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1923 Enable the last instruction heuristic in the scheduler
1925 fsched-dep-count-heuristic
1926 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1927 Enable the dependent count heuristic in the scheduler
1930 Common Report Var(flag_section_anchors) Optimization
1931 Access data in the same section from shared anchor points
1935 Does nothing. Preserved for backward compatibility.
1939 Does nothing. Preserved for backward compatibility.
1942 Common Report Var(flag_ree) Init(0)
1943 Turn on Redundant Extensions Elimination pass.
1946 Common Report Var(flag_show_column) Init(1)
1947 Show column numbers in diagnostics, when available. Default on
1950 Common Report Var(flag_shrink_wrap) Optimization
1951 Emit function prologues only before parts of the function that need it,
1952 rather than at the top of the function.
1955 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1956 Disable optimizations observable by IEEE signaling NaNs
1959 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1960 Disable floating point optimizations that ignore the IEEE signedness of zero
1962 fsingle-precision-constant
1963 Common Report Var(flag_single_precision_constant) Optimization
1964 Convert floating point constants to single precision constants
1966 fsplit-ivs-in-unroller
1967 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1968 Split lifetimes of induction variables when loops are unrolled
1971 Common Report Var(flag_split_stack) Init(-1)
1972 Generate discontiguous stack frames
1975 Common Report Var(flag_split_wide_types) Optimization
1976 Split wide types into independent registers
1979 Common Report Var(flag_ssa_phiopt) Optimization
1980 Optimize conditional patterns using SSA PHI nodes
1982 fvariable-expansion-in-unroller
1983 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1984 Apply variable expansion when loops are unrolled
1987 Common Report RejectNegative Joined
1988 -fstack-check=[no|generic|specific] Insert stack checking code into the program
1991 Common Alias(fstack-check=, specific, no)
1992 Insert stack checking code into the program. Same as -fstack-check=specific
1995 Common Var(common_deferred_options) Defer
1997 fstack-limit-register=
1998 Common RejectNegative Joined Var(common_deferred_options) Defer
1999 -fstack-limit-register=<register> Trap if the stack goes past <register>
2001 fstack-limit-symbol=
2002 Common RejectNegative Joined Var(common_deferred_options) Defer
2003 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
2006 Common Report Var(flag_stack_protect, 1)
2007 Use propolice as a stack protection method
2009 fstack-protector-all
2010 Common Report RejectNegative Var(flag_stack_protect, 2)
2011 Use a stack protection method for every function
2013 fstack-protector-strong
2014 Common Report RejectNegative Var(flag_stack_protect, 3)
2015 Use a smart stack protection method for certain functions
2018 Common RejectNegative Var(flag_stack_usage)
2019 Output stack usage information on a per-function basis
2023 Does nothing. Preserved for backward compatibility.
2025 ; Nonzero if we should do (language-dependent) alias analysis.
2026 ; Typically, this analysis will assume that expressions of certain
2027 ; types do not alias expressions of certain other types. Only used
2028 ; if alias analysis (in general) is enabled.
2030 Common Report Var(flag_strict_aliasing) Optimization
2031 Assume strict aliasing rules apply
2034 Common Report Var(flag_strict_overflow)
2035 Treat signed overflow as undefined
2038 Common Report Var(flag_sync_libcalls) Init(1)
2039 Implement __atomic operations via libcalls to legacy __sync functions
2042 Common Report Var(flag_syntax_only)
2043 Check for syntax errors, then stop
2046 Common Report Var(flag_test_coverage)
2047 Create data files needed by \"gcov\"
2050 Common Report Var(flag_thread_jumps) Optimization
2051 Perform jump threading optimizations
2054 Common Report Var(time_report)
2055 Report the time taken by each compiler pass
2058 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2059 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
2062 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2065 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2068 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2071 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2074 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2077 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
2078 Reorder top level functions, variables, and asms
2081 Common Report Var(flag_tracer)
2082 Perform superblock formation via tail duplication
2084 ; Zero means that floating-point math operations cannot generate a
2085 ; (user-visible) trap. This is the case, for example, in nonstop
2086 ; IEEE 754 arithmetic.
2088 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2089 Assume floating-point operations can trap
2092 Common Report Var(flag_trapv) Optimization
2093 Trap for signed overflow in addition, subtraction and multiplication
2096 Common Report Var(flag_tree_ccp) Optimization
2097 Enable SSA-CCP optimization on trees
2100 Common Report Var(flag_tree_bit_ccp) Optimization
2101 Enable SSA-BIT-CCP optimization on trees
2105 Does nothing. Preserved for backward compatibility.
2108 Common Report Var(flag_tree_ch) Optimization
2109 Enable loop header copying on trees
2111 ftree-coalesce-inlined-vars
2112 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2113 Enable coalescing of copy-related user variables that are inlined
2116 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2117 Enable coalescing of all copy-related user variables
2120 Common Report Var(flag_tree_copyrename) Optimization
2121 Replace SSA temporaries with better names in copies
2124 Common Report Var(flag_tree_copy_prop) Optimization
2125 Enable copy propagation on trees
2127 ftree-store-copy-prop
2129 Does nothing. Preserved for backward compatibility.
2132 Common Report Var(flag_tree_cselim) Init(2) Optimization
2133 Transform condition stores into unconditional ones
2135 ftree-switch-conversion
2136 Common Report Var(flag_tree_switch_conversion) Optimization
2137 Perform conversions of switch initializations.
2140 Common Report Var(flag_tree_dce) Optimization
2141 Enable SSA dead code elimination optimization on trees
2143 ftree-dominator-opts
2144 Common Report Var(flag_tree_dom) Optimization
2145 Enable dominator optimizations
2148 Common Report Var(flag_tree_tail_merge) Optimization
2149 Enable tail merging on trees
2152 Common Report Var(flag_tree_dse) Optimization
2153 Enable dead store elimination
2156 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2157 Enable forward propagation on trees
2160 Common Report Var(flag_tree_fre) Optimization
2161 Enable Full Redundancy Elimination (FRE) on trees
2164 Common Report Var(flag_optimize_strlen) Optimization
2165 Enable string length optimizations on trees
2167 fisolate-erroneous-paths-dereference
2168 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2169 Detect paths which trigger erroneous or undefined behaviour due to
2170 dereferencing a NULL pointer. Isolate those paths from the main control
2171 flow and turn the statement with erroneous or undefined behaviour into a trap.
2173 fisolate-erroneous-paths-attribute
2174 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2175 Detect paths which trigger erroneous or undefined behaviour due a NULL value
2176 being used in a way which is forbidden by a returns_nonnull or nonnull
2177 attribute. Isolate those paths from the main control flow and turn the
2178 statement with erroneous or undefined behaviour into a trap.
2180 ftree-loop-distribution
2181 Common Report Var(flag_tree_loop_distribution) Optimization
2182 Enable loop distribution on trees
2184 ftree-loop-distribute-patterns
2185 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2186 Enable loop distribution for patterns transformed into a library call
2189 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2190 Enable loop invariant motion on trees
2193 Common Alias(floop-interchange)
2194 Enable loop interchange transforms. Same as -floop-interchange
2197 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2198 Create canonical induction variables in loops
2201 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2202 Enable loop optimizations on tree level
2204 ftree-parallelize-loops=
2205 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2206 Enable automatic parallelization of loops
2209 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2210 Enable hoisting loads from conditional pointers.
2213 Common Report Var(flag_tree_pre) Optimization
2214 Enable SSA-PRE optimization on trees
2217 Common Report Var(flag_tree_partial_pre) Optimization
2218 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2221 Common Report Var(flag_tree_pta) Optimization
2222 Perform function-local points-to analysis on trees.
2225 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2226 Enable reassociation on tree level
2230 Does nothing. Preserved for backward compatibility.
2233 Common Report Var(flag_tree_sink) Optimization
2234 Enable SSA code sinking on trees
2237 Common Report Var(flag_tree_slsr) Optimization
2238 Perform straight-line strength reduction
2241 Common Report Var(flag_tree_sra) Optimization
2242 Perform scalar replacement of aggregates
2245 Common Report Var(flag_tree_ter) Optimization
2246 Replace temporary expressions in the SSA->normal pass
2249 Common Report Var(flag_tree_live_range_split) Optimization
2250 Perform live range splitting during the SSA->normal pass
2253 Common Report Var(flag_tree_vrp) Init(0) Optimization
2254 Perform Value Range Propagation on trees
2257 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2258 Compile whole compilation unit at a time
2261 Common Report Var(flag_unroll_loops) Optimization
2262 Perform loop unrolling when iteration count is known
2265 Common Report Var(flag_unroll_all_loops) Optimization
2266 Perform loop unrolling for all loops
2268 ; Nonzero means that loop optimizer may assume that the induction variables
2269 ; that control loops do not overflow and that the loops with nontrivial
2270 ; exit condition are not infinite
2271 funsafe-loop-optimizations
2272 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2273 Allow loop optimizations to assume that the loops behave in normal way
2276 Common Report Var(flag_associative_math) SetByCombined
2277 Allow optimization for floating-point arithmetic which may change the
2278 result of the operation due to rounding.
2281 Common Report Var(flag_reciprocal_math) SetByCombined
2282 Same as -fassociative-math for expressions which include division.
2284 ; Nonzero means that unsafe floating-point math optimizations are allowed
2285 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2286 ; are allowed to assume that their arguments and results are "normal"
2287 ; (e.g., nonnegative for SQRT).
2288 funsafe-math-optimizations
2289 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2290 Allow math optimizations that may violate IEEE or ISO standards
2293 Common Report Var(flag_unswitch_loops) Optimization
2294 Perform loop unswitching
2297 Common Report Var(flag_unwind_tables) Optimization
2298 Just generate unwind tables for exception handling
2301 Common Driver Negative(fuse-ld=gold)
2302 Use the bfd linker instead of the default linker
2305 Common Driver Negative(fuse-ld=bfd)
2306 Use the gold linker instead of the default linker
2309 Common Undocumented Var(flag_use_linker_plugin)
2311 ; Positive if we should track variables, negative if we should run
2312 ; the var-tracking pass only to discard debug annotations, zero if
2313 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2314 ; will be set according to optimize, debug_info_level and debug_hooks
2315 ; in process_options ().
2317 Common Report Var(flag_var_tracking) Init(2) Optimization
2318 Perform variable tracking
2320 ; Positive if we should track variables at assignments, negative if
2321 ; we should run the var-tracking pass only to discard debug
2322 ; annotations. When flag_var_tracking_assignments ==
2323 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2324 fvar-tracking-assignments
2325 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2326 Perform variable tracking by annotating assignments
2328 ; Nonzero if we should toggle flag_var_tracking_assignments after
2329 ; processing options and computing its default. */
2330 fvar-tracking-assignments-toggle
2331 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2332 Toggle -fvar-tracking-assignments
2334 ; Positive if we should track uninitialized variables, negative if
2335 ; we should run the var-tracking pass only to discard debug
2336 ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
2337 ; will be set according to flag_var_tracking.
2338 fvar-tracking-uninit
2339 Common Report Var(flag_var_tracking_uninit) Optimization
2340 Perform variable tracking and also tag variables that are uninitialized
2343 Common Report Var(flag_tree_vectorize) Optimization
2344 Enable vectorization on trees
2346 ftree-vectorizer-verbose=
2347 Common Joined RejectNegative Ignore
2348 Does nothing. Preserved for backward compatibility.
2350 ftree-loop-vectorize
2351 Common Report Var(flag_tree_loop_vectorize) Optimization
2352 Enable loop vectorization on trees
2355 Common Report Var(flag_tree_slp_vectorize) Optimization
2356 Enable basic block vectorization (SLP) on trees
2359 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT)
2360 Specifies the cost model for vectorization
2363 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED)
2364 Specifies the vectorization cost model for code marked with a simd directive
2367 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2370 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2373 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2376 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2379 Common RejectNegative Alias(fvect-cost-model=,dynamic)
2380 Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
2383 Common RejectNegative Alias(fvect-cost-model=,unlimited)
2384 Enables the unlimited vectorizer cost model. Preserved for backward compatibility.
2386 ftree-vect-loop-version
2388 Does nothing. Preserved for backward compatibility.
2391 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2392 Enable copy propagation of scalar-evolution information.
2394 ; -fverbose-asm causes extra commentary information to be produced in
2395 ; the generated assembly code (to make it more readable). This option
2396 ; is generally only of use to those who actually need to read the
2397 ; generated assembly code (perhaps while debugging the compiler itself).
2398 ; -fno-verbose-asm, the default, causes the extra information
2399 ; to not be added and is useful when comparing two assembler files.
2401 Common Report Var(flag_verbose_asm)
2402 Add extra commentary to assembler output
2405 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2406 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2409 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2412 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2415 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2418 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2421 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2424 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2425 Validate vtable pointers before using them.
2428 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2431 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2434 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2437 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2440 Common Var(flag_vtv_counts)
2441 Output vtable verification counters.
2444 Common Var(flag_vtv_debug)
2445 Output vtable verification pointer sets information.
2448 Common Report Var(flag_value_profile_transformations) Optimization
2449 Use expression value profiles in optimizations
2452 Common Report Var(flag_web) Init(2) Optimization
2453 Construct webs and split unrelated uses of single variable
2455 ftree-builtin-call-dce
2456 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2457 Enable conditional dead code elimination for builtin calls
2460 Common Report Var(flag_whole_program) Init(0) Optimization
2461 Perform whole program optimizations
2464 Common Report Var(flag_wrapv) Optimization
2465 Assume signed arithmetic overflow wraps around
2467 fzero-initialized-in-bss
2468 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2469 Put zero initialized data in the bss section
2472 Common JoinedOrMissing
2473 Generate debug information in default format
2476 Common JoinedOrMissing Negative(gdwarf)
2477 Generate debug information in COFF format
2480 Common JoinedOrMissing Negative(gdwarf-)
2481 Generate debug information in default version of DWARF format
2484 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2485 Generate debug information in DWARF v2 (or later) format
2488 Common JoinedOrMissing
2489 Generate debug information in default extended format
2492 Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2493 Don't generate DWARF pubnames and pubtypes sections.
2496 Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2497 Generate DWARF pubnames and pubtypes sections.
2500 Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2501 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2503 gno-record-gcc-switches
2504 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2505 Don't record gcc command line switches in DWARF DW_AT_producer.
2507 grecord-gcc-switches
2508 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2509 Record gcc command line switches in DWARF DW_AT_producer.
2512 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2513 Don't generate debug information in separate .dwo files
2516 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2517 Generate debug information in separate .dwo files
2520 Common JoinedOrMissing Negative(gstabs+)
2521 Generate debug information in STABS format
2524 Common JoinedOrMissing Negative(gvms)
2525 Generate debug information in extended STABS format
2528 Common RejectNegative Var(dwarf_strict,0) Init(0)
2529 Emit DWARF additions beyond selected version
2532 Common Report RejectNegative Var(dwarf_strict,1)
2533 Don't emit DWARF additions beyond selected version
2536 Common Report Var(flag_gtoggle)
2537 Toggle debug information generation
2540 Common JoinedOrMissing Negative(gxcoff)
2541 Generate debug information in VMS format
2544 Common JoinedOrMissing Negative(gxcoff+)
2545 Generate debug information in XCOFF format
2548 Common JoinedOrMissing Negative(gcoff)
2549 Generate debug information in extended XCOFF format
2552 Name(compressed_debug_sections) Type(int)
2554 ; Since -gz= is completely handled in specs, the values aren't used and we
2555 ; assign arbitrary constants.
2557 Enum(compressed_debug_sections) String(none) Value(0)
2560 Enum(compressed_debug_sections) String(zlib) Value(1)
2563 Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
2567 Generate compressed debug sections
2570 Common Driver Joined Enum(compressed_debug_sections)
2571 -gz=<format> Generate compressed debug sections in format <format>
2574 Driver Joined Separate
2577 Common Joined Var(plugindir_string) Init(0)
2578 -iplugindir=<dir> Set <dir> to be the default plugin directory
2581 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2582 -imultiarch <dir> Set <dir> to be the multiarch include subdirectory
2585 Driver Joined Separate
2590 no-canonical-prefixes
2603 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2604 -o <file> Place output into <file>
2607 Common Var(profile_flag)
2608 Enable function profiling
2611 Driver Var(pass_exit_codes)
2614 Common Alias(Wpedantic)
2617 Common Var(flag_pedantic_errors)
2618 Like -pedantic but issue them as errors
2624 Driver Var(use_pipes)
2627 Driver JoinedOrMissing Var(print_file_name)
2629 print-libgcc-file-name
2632 print-multi-directory
2633 Driver Var(print_multi_directory)
2636 Driver Var(print_multi_lib)
2638 print-multi-os-directory
2639 Driver Var(print_multi_os_directory)
2642 Driver Var(print_multiarch)
2645 Driver JoinedOrMissing Var(print_prog_name)
2648 Driver Var(print_search_dirs)
2651 Driver Var(print_sysroot)
2653 print-sysroot-headers-suffix
2654 Driver Var(print_sysroot_headers_suffix)
2657 Common Var(quiet_flag) RejectDriver
2658 Do not display functions compiled or elapsed time
2676 Driver Var(report_times)
2679 Driver JoinedOrMissing
2682 Driver Joined Separate
2686 ; C option, but driver must not handle as "-u ndef".
2689 Common Driver Var(verbose_flag)
2690 Enable verbose output
2693 Common Var(version_flag) RejectDriver
2694 Display the compiler's version
2697 Common Var(inhibit_warnings)
2701 Driver Separate Var(wrapper_string)
2704 Driver Joined Separate
2707 Driver RejectNegative Negative(pie)
2708 Create a shared library
2714 Driver Separate Alias(specs=)
2727 ; Documented for Fortran, but always accepted by driver.
2734 ; Documented for Go, but always accepted by driver.
2752 Driver RejectNegative Negative(shared)
2753 Create a position independent executable
2756 Driver Joined Separate
2759 Common Report Var(flag_use_caller_save) Optimization
2760 Use caller save register across calls if possible
2762 ; This comment is to ensure we retain the blank line above.