* i386.c (ix86_expand_set_or_movmem): Disable 512bit loops for targets
[official-gcc.git] / gcc / common.opt
blobce8194b58fafc7d6181ec10cd811761c77848006
1 ; Options for the language- and target-independent parts of the compiler.
3 ; Copyright (C) 2003-2017 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
10 ; version.
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
15 ; for more details.
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.
25 Variable
26 int target_flags
28 Variable
29 int optimize
31 Variable
32 int optimize_size
34 Variable
35 int optimize_debug
37 ; Not used directly to control optimizations, only to save -Ofast
38 ; setting for "optimize" attributes.
39 Variable
40 int optimize_fast
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.
46 Variable
47 bool in_lto_p = false
49 ; This variable is set to non-0 only by LTO front-end.  1 indicates that
50 ; the output produced will be used for incrmeental linking (thus weak symbols
51 ; can still be bound).
52 Variable
53 int flag_incremental_link = 0
55 ; 0 means straightforward implementation of complex divide acceptable.
56 ; 1 means wide ranges of inputs must work for complex divide.
57 ; 2 means C99-like requirements for complex multiply and divide.
58 Variable
59 int flag_complex_method = 1
61 ; Language specific warning pass for unused results.
62 Variable
63 bool flag_warn_unused_result = false
65 Variable
66 int *param_values
68 ; Nonzero if we should write GIMPLE bytecode for link-time optimization.
69 Variable
70 int flag_generate_lto
72 ; Nonzero if we should write GIMPLE bytecode for offload compilation.
73 Variable
74 int flag_generate_offload = 0
76 ; True to warn about any objects definitions whose size is larger
77 ; than N bytes.  Also want about function definitions whose returned
78 ; values are larger than N bytes, where N is 'larger_than_size'.
79 Variable
80 bool warn_larger_than
82 Variable
83 HOST_WIDE_INT larger_than_size
85 ; True to warn about any function whose frame size is larger
86 ; than N bytes.
87 Variable
88 bool warn_frame_larger_than
90 Variable
91 HOST_WIDE_INT frame_larger_than_size
93 ; Nonzero means we should be saving declaration info into a .X file.
94 Variable
95 int flag_gen_aux_info = 0
97 ; Nonzero if we are compiling code for a shared library, zero for
98 ; executable.
99 Variable
100 int flag_shlib
102 ; These two are really VEC(char_p,heap) *.
104 Variable
105 void *flag_instrument_functions_exclude_functions
107 Variable
108 void *flag_instrument_functions_exclude_files
110 ; Generic structs (e.g. templates not explicitly specialized)
111 ; may not have a compilation unit associated with them, and so
112 ; may need to be treated differently from ordinary structs.
114 ; Structs only handled by reference (indirectly), will also usually
115 ; not need as much debugging information.
117 Variable
118 enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
120 Variable
121 enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
123 ; True if we should exit after parsing options.
124 Variable
125 bool exit_after_options
127 ; Type(s) of debugging information we are producing (if any).  See
128 ; flag-types.h for the definitions of the different possible types of
129 ; debugging information.
130 Variable
131 enum debug_info_type write_symbols = NO_DEBUG
133 ; Level of debugging information we are producing.  See flag-types.h
134 ; for the definitions of the different possible levels.
135 Variable
136 enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
138 ; Nonzero means use GNU-only extensions in the generated symbolic
139 ; debugging information.  Currently, this only has an effect when
140 ; write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG.
141 Variable
142 bool use_gnu_debug_info_extensions
144 ; Original value of maximum field alignment in bytes, specified via
145 ; -fpack-struct=<value>.
146 Variable
147 unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
149 ; Type of stack check.
150 Variable
151 enum stack_check_type flag_stack_check = NO_STACK_CHECK
153 ; True if stack usage information needs to be computed.
154 Variable
155 bool flag_stack_usage_info = false
157 ; -dA causes debug commentary information to be produced in
158 ; the generated assembly code (to make it more readable).  This option
159 ; is generally only of use to those who actually need to read the
160 ; generated assembly code (perhaps while debugging the compiler itself).
161 ; Currently, this switch is only used by dwarf2out.c; however, it is intended
162 ; to be a catchall for printing debug information in the assembler file.
163 Variable
164 int flag_debug_asm
166 ; How many NOP insns to place at each function entry by default
167 Variable
168 HOST_WIDE_INT function_entry_patch_area_size
170 ; And how far the real asm entry point is into this area
171 Variable
172 HOST_WIDE_INT function_entry_patch_area_start
174 ; Balance between GNAT encodings and standard DWARF to emit.
175 Variable
176 enum dwarf_gnat_encodings gnat_encodings = DWARF_GNAT_ENCODINGS_DEFAULT
178 ; -dP causes the rtl to be emitted as a comment in assembly.
179 Variable
180 int flag_dump_rtl_in_asm
182 ; Whether -da was passed (used only in handle_common_deferred_options).
183 Variable
184 bool flag_dump_all_passed
186 ; Other flags saying which kinds of debugging dump have been requested.
188 Variable
189 int rtl_dump_and_exit
191 Variable
192 int flag_print_asm_name
194 ; Name of top-level original source file (what was input to cpp).
195 ; This comes from the #-command at the beginning of the actual input.
196 ; If there isn't any there, then this is the cc1 input file name.
197 Variable
198 const char *main_input_filename
200 ; Pointer to base name in main_input_filename, with directories and a
201 ; single final extension removed, and the length of this base
202 ; name.
204 Variable
205 const char *main_input_basename
207 Variable
208 int main_input_baselength
210 ; Which options have been printed by --help.
211 Variable
212 char *help_printed
214 ; Which enums have been printed by --help.  0 = not printed, no
215 ; relevant options seen, 1 = relevant option seen, not yet printed, 2
216 ; = printed.
217 Variable
218 char *help_enum_printed
220 ; The number of columns for --help output.
221 Variable
222 unsigned int help_columns
224 ; Whether this options structure has been through finish_options
225 Variable
226 bool flag_opts_finished
228 ; What the sanitizer should instrument
229 Variable
230 unsigned int flag_sanitize
232 ; What sanitizers should recover from errors
233 Variable
234 unsigned int flag_sanitize_recover = (SANITIZE_UNDEFINED | SANITIZE_UNDEFINED_NONDEFAULT | SANITIZE_KERNEL_ADDRESS) & ~(SANITIZE_UNREACHABLE | SANITIZE_RETURN)
236 ; What the coverage sanitizers should instrument
237 Variable
238 unsigned int flag_sanitize_coverage
240 ; Flag whether a prefix has been added to dump_base_name
241 Variable
242 bool dump_base_name_prefixed = false
244 ; Flag whether HSA generation has been explicitely disabled
245 Variable
246 bool flag_disable_hsa = false
249 Driver
251 -assemble
252 Driver Alias(S)
254 -compile
255 Driver Alias(c)
257 -coverage
258 Driver Alias(coverage)
260 -debug
261 Common Alias(g)
263 -dump
264 Common Separate Alias(d)
266 -dump=
267 Common Joined Alias(d)
269 -dumpbase
270 Common Separate Alias(dumpbase)
272 -dumpdir
273 Common Separate Alias(dumpdir)
275 -entry
276 Driver Separate Alias(e)
278 -entry=
279 Driver Joined Alias(e)
281 -extra-warnings
282 Common Warning Alias(Wextra)
284 -for-assembler
285 Driver Separate Alias(Xassembler)
287 -for-assembler=
288 Driver JoinedOrMissing Alias(Xassembler)
290 -for-linker
291 Driver Separate Alias(Xlinker)
293 -for-linker=
294 Driver JoinedOrMissing Alias(Xlinker)
296 -force-link
297 Driver Separate Alias(u)
299 -force-link=
300 Driver Joined Alias(u)
302 -help
303 Common Driver Var(help_flag)
304 Display this information.
306 -help=
307 Common Driver Report Joined
308 --help=<class>  Display descriptions of a specific class of options.  <class> is one or more of optimizers, target, warnings, undocumented, params.
310 -language
311 Driver Separate Alias(x)
313 -language=
314 Driver Joined Alias(x)
316 -library-directory
317 Driver Separate Alias(L)
319 -library-directory=
320 Driver Joined Alias(L)
322 -no-canonical-prefixes
323 Driver Alias(no-canonical-prefixes)
325 -no-standard-libraries
326 Driver Alias(nostdlib)
328 -no-sysroot-suffix
329 Driver Var(no_sysroot_suffix)
331 -no-warnings
332 Common Alias(w)
334 -optimize
335 Common Alias(O)
337 -output
338 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
340 -output=
341 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
343 -pass-exit-codes
344 Driver Alias(pass-exit-codes)
346 -pedantic
347 Common Alias(Wpedantic)
349 -pedantic-errors
350 Common Alias(pedantic-errors)
352 -pie
353 Driver Alias(pie)
355 -static-pie
356 Driver Alias(static-pie)
358 -pipe
359 Driver Alias(pipe)
361 -prefix
362 Driver Separate Alias(B)
364 -prefix=
365 Driver JoinedOrMissing Alias(B)
367 -preprocess
368 Driver Alias(E)
370 -print-file-name
371 Driver Separate Alias(print-file-name=)
373 -print-file-name=
374 Driver JoinedOrMissing Alias(print-file-name=)
376 -print-libgcc-file-name
377 Driver Alias(print-libgcc-file-name)
379 -print-multi-directory
380 Driver Alias(print-multi-directory)
382 -print-multi-lib
383 Driver Alias(print-multi-lib)
385 -print-multi-os-directory
386 Driver Alias(print-multi-os-directory)
388 -print-multiarch
389 Driver Alias(print-multiarch)
391 -print-prog-name
392 Driver Separate Alias(print-prog-name=)
394 -print-prog-name=
395 Driver JoinedOrMissing Alias(print-prog-name=)
397 -print-search-dirs
398 Driver Alias(print-search-dirs)
400 -print-sysroot
401 Driver Alias(print-sysroot)
403 -print-sysroot-headers-suffix
404 Driver Alias(print-sysroot-headers-suffix)
406 -profile
407 Common Alias(p)
409 -save-temps
410 Driver Alias(save-temps)
412 -shared
413 Driver Alias(shared)
415 -specs
416 Driver Separate Alias(specs=)
418 -specs=
419 Driver Joined Alias(specs=)
421 -static
422 Driver Alias(static)
424 -symbolic
425 Driver Alias(symbolic)
427 -target-help
428 Common Driver
429 Alias for --help=target.
431 -time
432 Driver Alias(time)
434 -verbose
435 Driver Alias(v)
437 ;; The driver used to convert options such as --help into forms such
438 ;; as -fhelp; the following four entries are for compatibility with
439 ;; any direct uses of those (undocumented) -f forms
440 fhelp
441 Common Driver Alias(-help)
443 fhelp=
444 Common Driver Joined Alias(-help=)
446 ftarget-help
447 Common Driver Alias(-target-help)
449 fversion
450 Common Driver Alias(-version)
452 -param
453 Common Separate
454 --param <param>=<value> Set parameter <param> to value.  See below for a complete list of parameters.
456 -param=
457 Common Joined Alias(-param)
459 -sysroot
460 Driver Separate Alias(-sysroot=)
462 -sysroot=
463 Driver JoinedOrMissing
465 -version
466 Common Driver
469 Driver Joined Separate
472 Driver
475 Driver Joined Separate
478 Driver
481 Common JoinedOrMissing Optimization
482 -O<number>      Set optimization level to <number>.
485 Common Optimization
486 Optimize for space rather than speed.
488 Ofast
489 Common Optimization
490 Optimize for speed disregarding exact standards compliance.
493 Common Optimization
494 Optimize for debugging experience rather than speed or size.
497 Driver
500 Driver Negative(Qy)
503 Driver Negative(Qn)
506 Driver Joined Separate
509 Driver
512 Driver Joined Separate
514 Tbss
515 Driver Separate
517 Tbss=
518 Driver Joined
520 Tdata
521 Driver Separate
523 Tdata=
524 Driver Joined
526 Ttext
527 Driver Separate
529 Ttext=
530 Driver Joined
533 Common RejectNegative Warning Alias(Wextra)
534 This switch is deprecated; use -Wextra instead.
537 Driver JoinedOrMissing RejectNegative
540 Driver JoinedOrMissing RejectNegative
543 Driver JoinedOrMissing RejectNegative
545 Waggregate-return
546 Common Var(warn_aggregate_return) Warning
547 Warn about returning structures, unions or arrays.
549 Waggressive-loop-optimizations
550 Common Var(warn_aggressive_loop_optimizations) Init(1) Warning
551 Warn if a loop with constant number of iterations triggers undefined behavior.
553 Warray-bounds
554 Common Var(warn_array_bounds) Warning
555 Warn if an array is accessed out of bounds.
557 Warray-bounds=
558 Common Joined RejectNegative UInteger Var(warn_array_bounds) Warning IntegerRange(0, 2)
559 Warn if an array is accessed out of bounds.
561 Wattributes
562 Common Var(warn_attributes) Init(1) Warning
563 Warn about inappropriate attribute usage.
565 Wcast-align
566 Common Var(warn_cast_align) Warning
567 Warn about pointer casts which increase alignment.
569 Wcast-align=strict
570 Common Var(warn_cast_align,2) Warning
571 Warn about pointer casts which increase alignment.
573 Wcpp
574 Common Var(warn_cpp) Init(1) Warning
575 Warn when a #warning directive is encountered.
577 Wdeprecated-declarations
578 Common Var(warn_deprecated_decl) Init(1) Warning
579 Warn about uses of __attribute__((deprecated)) declarations.
581 Wdisabled-optimization
582 Common Var(warn_disabled_optimization) Warning
583 Warn when an optimization pass is disabled.
585 Werror
586 Common Var(warnings_are_errors)
587 Treat all warnings as errors.
589 Werror=
590 Common Joined
591 Treat specified warning as error.
593 Wextra
594 Common Var(extra_warnings) Warning
595 Print extra (possibly unwanted) warnings.
597 Wfatal-errors
598 Common Var(flag_fatal_errors)
599 Exit on the first error occurred.
601 Wframe-larger-than=
602 Common RejectNegative Joined UInteger Warning
603 -Wframe-larger-than=<number>    Warn if a function's stack frame requires more than <number> bytes.
605 Wfree-nonheap-object
606 Common Var(warn_free_nonheap_object) Init(1) Warning
607 Warn when attempting to free a non-heap object.
609 Whsa
610 Common Var(warn_hsa) Init(1) Warning
611 Warn when a function cannot be expanded to HSAIL.
613 Wimplicit-fallthrough
614 Common Alias(Wimplicit-fallthrough=,3,0) Warning
616 Wimplicit-fallthrough=
617 Common Var(warn_implicit_fallthrough) RejectNegative Joined UInteger Warning IntegerRange(0, 5)
618 Warn when a switch case falls through.
620 Winline
621 Common Var(warn_inline) Warning
622 Warn when an inlined function cannot be inlined.
624 Winvalid-memory-model
625 Common Var(warn_invalid_memory_model) Init(1) Warning
626 Warn when an atomic memory model parameter is known to be outside the valid range.
628 Wlarger-than-
629 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
631 Wlarger-than=
632 Common RejectNegative Joined UInteger Warning
633 -Wlarger-than=<number>  Warn if an object is larger than <number> bytes.
635 Wnonnull-compare
636 Var(warn_nonnull_compare) Warning
637 Warn if comparing pointer parameter with nonnull attribute with NULL.
639 Wnull-dereference
640 Common Var(warn_null_dereference) Warning
641 Warn if dereferencing a NULL pointer may lead to erroneous or undefined behavior.
643 Wunsafe-loop-optimizations
644 Common Var(warn_unsafe_loop_optimizations) Warning
645 Warn if the loop cannot be optimized due to nontrivial assumptions.
647 Wmissing-noreturn
648 Common Warning Alias(Wsuggest-attribute=noreturn)
650 Wodr
651 Common Var(warn_odr_violations) Init(1) Warning
652 Warn about some C++ One Definition Rule violations during link time optimization.
654 Woverflow
655 Common Var(warn_overflow) Init(1) Warning
656 Warn about overflow in arithmetic expressions.
658 Wlto-type-mismatch
659 Common Var(warn_lto_type_mismatch) Init(1) Warning
660 During link time optimization warn about mismatched types of global declarations.
662 Wpacked
663 Common Var(warn_packed) Warning
664 Warn when the packed attribute has no effect on struct layout.
666 Wpadded
667 Common Var(warn_padded) Warning
668 Warn when padding is required to align structure members.
670 Wpedantic
671 Common Var(pedantic) Init(0) Warning
672 Issue warnings needed for strict compliance to the standard.
674 Wreturn-local-addr
675 Common Var(warn_return_local_addr) Init(1) Warning
676 Warn about returning a pointer/reference to a local or temporary variable.
678 Wshadow
679 Common Var(warn_shadow) Warning
680 Warn when one variable shadows another.  Same as -Wshadow=global.
682 Wshadow=global
683 Common Warning Alias(Wshadow)
684 Warn when one variable shadows another (globally).
686 Wshadow=local
687 Common Var(warn_shadow_local) Warning EnabledBy(Wshadow)
688 Warn when one local variable shadows another local variable or parameter.
690 Wshadow-local
691 Common Warning Undocumented Alias(Wshadow=local)
693 Wshadow=compatible-local
694 Common Var(warn_shadow_compatible_local) Warning EnabledBy(Wshadow=local)
695 Warn when one local variable shadows another local variable or parameter of compatible type.
697 Wshadow-compatible-local
698 Common Warning Undocumented Alias(Wshadow=compatible-local)
700 Wstack-protector
701 Common Var(warn_stack_protect) Warning
702 Warn when not issuing stack smashing protection for some reason.
704 Wstack-usage=
705 Common Joined RejectNegative UInteger Var(warn_stack_usage) Warning
706 -Wstack-usage=<number>  Warn if stack usage might be larger than specified amount.
708 Wstrict-aliasing
709 Common Warning
710 Warn about code which might break strict aliasing rules.
712 Wstrict-aliasing=
713 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
714 Warn about code which might break strict aliasing rules.
716 Wstrict-overflow
717 Common Warning
718 Warn about optimizations that assume that signed overflow is undefined.
720 Wstrict-overflow=
721 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
722 Warn about optimizations that assume that signed overflow is undefined.
724 Wsuggest-attribute=cold
725 Common Var(warn_suggest_attribute_cold) Warning
726 Warn about functions which might be candidates for __attribute__((cold)).
728 Wsuggest-attribute=const
729 Common Var(warn_suggest_attribute_const) Warning
730 Warn about functions which might be candidates for __attribute__((const)).
732 Wsuggest-attribute=pure
733 Common Var(warn_suggest_attribute_pure) Warning
734 Warn about functions which might be candidates for __attribute__((pure)).
736 Wsuggest-attribute=noreturn
737 Common Var(warn_suggest_attribute_noreturn) Warning
738 Warn about functions which might be candidates for __attribute__((noreturn)).
740 Wsuggest-final-types
741 Common Var(warn_suggest_final_types) Warning
742 Warn about C++ polymorphic types where adding final keyword would improve code quality.
744 Wsuggest-final-methods
745 Common Var(warn_suggest_final_methods) Warning
746 Warn about C++ virtual methods where adding final keyword would improve code quality.
748 Wswitch-unreachable
749 Common Var(warn_switch_unreachable) Warning Init(1)
750 Warn about statements between switch's controlling expression and the first
751 case.
753 Wsystem-headers
754 Common Var(warn_system_headers) Warning
755 Do not suppress warnings from system headers.
757 Wtrampolines
758 Common Var(warn_trampolines) Warning
759 Warn whenever a trampoline is generated.
761 Wtype-limits
762 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
763 Warn if a comparison is always true or always false due to the limited range of the data type.
765 Wuninitialized
766 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
767 Warn about uninitialized automatic variables.
769 Wmaybe-uninitialized
770 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
771 Warn about maybe uninitialized automatic variables.
773 Wunreachable-code
774 Common Ignore Warning
775 Does nothing. Preserved for backward compatibility.
777 Wunused
778 Common Var(warn_unused) Init(0) Warning
779 Enable all -Wunused- warnings.
781 Wunused-but-set-parameter
782 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
783 Warn when a function parameter is only set, otherwise unused.
785 Wunused-but-set-variable
786 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
787 Warn when a variable is only set, otherwise unused.
789 Wunused-function
790 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
791 Warn when a function is unused.
793 Wunused-label
794 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
795 Warn when a label is unused.
797 Wunused-parameter
798 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
799 Warn when a function parameter is unused.
801 Wunused-value
802 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
803 Warn when an expression value is unused.
805 Wunused-variable
806 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
807 Warn when a variable is unused.
809 Wcoverage-mismatch
810 Common Var(warn_coverage_mismatch) Init(1) Warning
811 Warn in case profiles in -fprofile-use do not match.
813 Wvector-operation-performance
814 Common Var(warn_vector_operation_performance) Warning
815 Warn when a vector operation is compiled outside the SIMD.
817 Xassembler
818 Driver Separate
820 Xlinker
821 Driver Separate
823 Xpreprocessor
824 Driver Separate
827 Driver
829 aux-info
830 Common Separate Var(aux_info_file_name)
831 -aux-info <file>        Emit declaration information into <file>.
833 aux-info=
834 Common Joined Alias(aux-info)
836 auxbase
837 Common Separate RejectDriver Var(aux_base_name)
839 auxbase-strip
840 Common Separate RejectDriver
842 coverage
843 Driver
846 Driver
849 Common Joined
850 -d<letters>     Enable dumps from specific passes of the compiler.
852 dumpbase
853 Common Separate Var(dump_base_name)
854 -dumpbase <file>        Set the file basename to be used for dumps.
856 dumpdir
857 Common Separate Var(dump_dir_name)
858 -dumpdir <dir>  Set the directory name to be used for dumps.
860 dumpmachine
861 Driver
863 dumpspecs
864 Driver
866 dumpversion
867 Driver
869 dumpfullversion
870 Driver
873 Driver Joined Separate
875 ; This option has historically been passed down to the linker by an
876 ; accident of a %{e*} spec, so ensure it continues to be passed down
877 ; as a single option.  The supported option for this purpose is
878 ; -rdynamic.  See PR 47390.
879 export-dynamic
880 Driver Undocumented
882 ; The version of the C++ ABI in use.  The following values are allowed:
884 ; 0: The version of the ABI believed most conformant with the C++ ABI
885 ;    specification.  This ABI may change as bugs are discovered and fixed.
886 ;    Therefore, 0 will not necessarily indicate the same ABI in different
887 ;    versions of G++.
889 ; 1: The version of the ABI first used in G++ 3.2.  No longer selectable.
891 ; 2: The version of the ABI first used in G++ 3.4, and the default
892 ;    until GCC 4.9.
894 ; 3: The version of the ABI that fixes the missing underscore
895 ;    in template non-type arguments of pointer type.
897 ; 4: The version of the ABI that introduces unambiguous mangling of
898 ;    vector types.  First selectable in G++ 4.5.
900 ; 5: The version of the ABI that ignores attribute const/noreturn
901 ;    in function pointer mangling, and corrects mangling of decltype and
902 ;    function parameters used in other parameters and the return type.
903 ;    First selectable in G++ 4.6.
905 ; 6: The version of the ABI that doesn't promote scoped enums to int and
906 ;    changes the mangling of template argument packs, const/static_cast,
907 ;    prefix ++ and --, and a class scope function used as a template
908 ;    argument.
909 ;    First selectable in G++ 4.7.
911 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
912 ;    corrects the mangling of lambdas in default argument scope.
913 ;    First selectable in G++ 4.8.
915 ; 8: The version of the ABI that corrects the substitution behavior of
916 ;    function types with function-cv-qualifiers.
917 ;    First selectable in G++ 4.9 and default in G++ 5.
919 ; 9: The version of the ABI that corrects the alignment of nullptr_t.
920 ;    First selectable and default in G++ 5.2.
922 ; 10: The version of the ABI that mangles attributes that affect type
923 ;     identity, such as ia32 calling convention attributes (stdcall, etc.)
924 ;     Default in G++ 6 (set in c_common_post_options).
926 ; 11: The version of the ABI that corrects mangling of sizeof... expressions
927 ;     and introduces new inheriting constructor handling.
928 ;     Default in G++ 7.
930 ; 12: Corrects the calling convention for classes with only deleted copy/move
931 ;     constructors.
932 ;     Default in G++ 8.
934 ; Additional positive integers will be assigned as new versions of
935 ; the ABI become the default version of the ABI.
936 fabi-version=
937 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(0)
938 The version of the C++ ABI in use.
940 faggressive-loop-optimizations
941 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
942 Aggressively optimize loops using language constraints.
944 falign-functions
945 Common Report Var(align_functions,0) Optimization UInteger
946 Align the start of functions.
948 falign-functions=
949 Common RejectNegative Joined UInteger Var(align_functions)
951 flimit-function-alignment
952 Common Report Var(flag_limit_function_alignment) Optimization Init(0)
954 falign-jumps
955 Common Report Var(align_jumps,0) Optimization UInteger
956 Align labels which are only reached by jumping.
958 falign-jumps=
959 Common RejectNegative Joined UInteger Var(align_jumps)
961 falign-labels
962 Common Report Var(align_labels,0) Optimization UInteger
963 Align all labels.
965 falign-labels=
966 Common RejectNegative Joined UInteger Var(align_labels)
968 falign-loops
969 Common Report Var(align_loops,0) Optimization UInteger
970 Align the start of loops.
972 falign-loops=
973 Common RejectNegative Joined UInteger Var(align_loops)
975 fargument-alias
976 Common Ignore
977 Does nothing. Preserved for backward compatibility.
979 fargument-noalias
980 Common Ignore
981 Does nothing. Preserved for backward compatibility.
983 fargument-noalias-global
984 Common Ignore
985 Does nothing. Preserved for backward compatibility.
987 fargument-noalias-anything
988 Common Ignore
989 Does nothing. Preserved for backward compatibility.
991 fsanitize=
992 Common Driver Report Joined
993 Select what to sanitize.
995 fsanitize-coverage=
996 Common Report Joined
997 Select what to coverage sanitize.
999 fasan-shadow-offset=
1000 Common Joined RejectNegative Var(common_deferred_options) Defer
1001 -fasan-shadow-offset=<number>   Use custom shadow memory offset.
1003 fsanitize-sections=
1004 Common Joined RejectNegative Var(common_deferred_options) Defer
1005 -fsanitize-sections=<sec1,sec2,...>     Sanitize global variables
1006 in user-defined sections.
1008 fsanitize-recover=
1009 Common Report Joined
1010 After diagnosing undefined behavior attempt to continue execution.
1012 fsanitize-recover
1013 Common Report
1014 This switch is deprecated; use -fsanitize-recover= instead.
1016 fsanitize-address-use-after-scope
1017 Common Driver Report Var(flag_sanitize_address_use_after_scope) Init(0)
1019 fsanitize-undefined-trap-on-error
1020 Common Driver Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
1021 Use trap instead of a library function for undefined behavior sanitization.
1023 fasynchronous-unwind-tables
1024 Common Report Var(flag_asynchronous_unwind_tables) Optimization
1025 Generate unwind tables that are exact at each instruction boundary.
1027 fauto-inc-dec
1028 Common Report Var(flag_auto_inc_dec) Init(1) Optimization
1029 Generate auto-inc/dec instructions.
1031 fauto-profile
1032 Common Report Var(flag_auto_profile)
1033 Use sample profile information for call graph node weights. The default
1034 profile file is fbdata.afdo in 'pwd'.
1036 fauto-profile=
1037 Common Joined RejectNegative Var(auto_profile_file)
1038 Use sample profile information for call graph node weights. The profile
1039 file is specified in the argument.
1041 ; -fcheck-bounds causes gcc to generate array bounds checks.
1042 ; For C, C++ and ObjC: defaults off.
1043 ; For Java: defaults to on.
1044 ; For Fortran: defaults to off.
1045 fbounds-check
1046 Common Report Var(flag_bounds_check)
1047 Generate code to check bounds before indexing arrays.
1049 fbranch-count-reg
1050 Common Report Var(flag_branch_on_count_reg) Optimization
1051 Replace add, compare, branch with branch on count register.
1053 fbranch-probabilities
1054 Common Report Var(flag_branch_probabilities) Optimization
1055 Use profiling information for branch probabilities.
1057 fbranch-target-load-optimize
1058 Common Report Var(flag_branch_target_load_optimize) Optimization
1059 Perform branch target load optimization before prologue / epilogue threading.
1061 fbranch-target-load-optimize2
1062 Common Report Var(flag_branch_target_load_optimize2) Optimization
1063 Perform branch target load optimization after prologue / epilogue threading.
1065 fbtr-bb-exclusive
1066 Common Report Var(flag_btr_bb_exclusive) Optimization
1067 Restrict target load migration not to re-use registers in any basic block.
1069 fcall-saved-
1070 Common Joined RejectNegative Var(common_deferred_options) Defer
1071 -fcall-saved-<register> Mark <register> as being preserved across functions.
1073 fcall-used-
1074 Common Joined RejectNegative Var(common_deferred_options) Defer
1075 -fcall-used-<register>  Mark <register> as being corrupted by function calls.
1077 ; Nonzero for -fcaller-saves: allocate values in regs that need to
1078 ; be saved across function calls, if that produces overall better code.
1079 ; Optional now, so people can test it.
1080 fcaller-saves
1081 Common Report Var(flag_caller_saves) Optimization
1082 Save registers around function calls.
1084 fcheck-data-deps
1085 Common Report Var(flag_check_data_deps)
1086 This switch is deprecated; do not use.
1088 fcheck-new
1089 Common Var(flag_check_new)
1090 Check the return value of new in C++.
1092 fchecking
1093 Common Var(flag_checking) Init(CHECKING_P ? ENABLE_EXTRA_CHECKING ? 2 : 1 : 0)
1094 Perform internal consistency checkings.
1096 fchecking=
1097 Common Joined RejectNegative UInteger Var(flag_checking)
1098 Perform internal consistency checkings.
1100 fcode-hoisting
1101 Common Report Var(flag_code_hoisting) Optimization
1102 Enable code hoisting.
1104 fcombine-stack-adjustments
1105 Common Report Var(flag_combine_stack_adjustments) Optimization
1106 Looks for opportunities to reduce stack adjustments and stack references.
1108 fcommon
1109 Common Report Var(flag_no_common,0)
1110 Do not put uninitialized globals in the common section.
1112 fcompare-debug
1113 Driver
1114 ; Converted by the driver to -fcompare-debug= options.
1116 fcompare-debug=
1117 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
1118 -fcompare-debug[=<opts>]        Compile with and without e.g. -gtoggle, and compare the final-insns dump.
1120 fcompare-debug-second
1121 Common Driver RejectNegative Var(flag_compare_debug)
1122 Run only the second compilation of -fcompare-debug.
1124 fcompare-elim
1125 Common Report Var(flag_compare_elim_after_reload) Optimization
1126 Perform comparison elimination after register allocation has finished.
1128 fconserve-stack
1129 Common Var(flag_conserve_stack) Optimization
1130 Do not perform optimizations increasing noticeably stack usage.
1132 fcprop-registers
1133 Common Report Var(flag_cprop_registers) Optimization
1134 Perform a register copy-propagation optimization pass.
1136 fcrossjumping
1137 Common Report Var(flag_crossjumping) Optimization
1138 Perform cross-jumping optimization.
1140 fcse-follow-jumps
1141 Common Report Var(flag_cse_follow_jumps) Optimization
1142 When running CSE, follow jumps to their targets.
1144 fcse-skip-blocks
1145 Common Ignore
1146 Does nothing.  Preserved for backward compatibility.
1148 fcx-limited-range
1149 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
1150 Omit range reduction step when performing complex division.
1152 fcx-fortran-rules
1153 Common Report Var(flag_cx_fortran_rules) Optimization
1154 Complex multiplication and division follow Fortran rules.
1156 fdata-sections
1157 Common Report Var(flag_data_sections)
1158 Place data items into their own section.
1160 fdbg-cnt-list
1161 Common Report Var(common_deferred_options) Defer
1162 List all available debugging counters with their limits and counts.
1164 fdbg-cnt=
1165 Common RejectNegative Joined Var(common_deferred_options) Defer
1166 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...]     Set the debug counter limit.
1168 fdebug-prefix-map=
1169 Common Joined RejectNegative Var(common_deferred_options) Defer
1170 Map one directory name to another in debug information.
1172 fdebug-types-section
1173 Common Report Var(flag_debug_types_section) Init(0)
1174 Output .debug_types section when using DWARF v4 debuginfo.
1176 ; Nonzero for -fdefer-pop: don't pop args after each function call
1177 ; instead save them up to pop many calls' args with one insns.
1178 fdefer-pop
1179 Common Report Var(flag_defer_pop) Optimization
1180 Defer popping functions args from stack until later.
1182 fdelayed-branch
1183 Common Report Var(flag_delayed_branch) Optimization
1184 Attempt to fill delay slots of branch instructions.
1186 fdelete-dead-exceptions
1187 Common Report Var(flag_delete_dead_exceptions) Init(0) Optimization
1188 Delete dead instructions that may throw exceptions.
1190 fdelete-null-pointer-checks
1191 Common Report Var(flag_delete_null_pointer_checks) Init(-1) Optimization
1192 Delete useless null pointer checks.
1194 fdevirtualize-at-ltrans
1195 Common Report Var(flag_ltrans_devirtualize)
1196 Stream extra data to support more aggressive devirtualization in LTO local transformation mode.
1198 fdevirtualize-speculatively
1199 Common Report Var(flag_devirtualize_speculatively) Optimization
1200 Perform speculative devirtualization.
1202 fdevirtualize
1203 Common Report Var(flag_devirtualize) Optimization
1204 Try to convert virtual calls to direct ones.
1206 fdiagnostics-show-location=
1207 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1208 -fdiagnostics-show-location=[once|every-line]   How often to emit source location at the beginning of line-wrapped diagnostics.
1210 ; Required for these enum values.
1211 SourceInclude
1212 pretty-print.h
1214 Enum
1215 Name(diagnostic_prefixing_rule) Type(int)
1217 EnumValue
1218 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1220 EnumValue
1221 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1223 fdiagnostics-show-caret
1224 Common Var(flag_diagnostics_show_caret) Init(1)
1225 Show the source line with a caret indicating the column.
1227 fdiagnostics-color
1228 Common Alias(fdiagnostics-color=,always,never)
1231 fdiagnostics-color=
1232 Driver Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1233 -fdiagnostics-color=[never|always|auto] Colorize diagnostics.
1235 ; Required for these enum values.
1236 SourceInclude
1237 diagnostic-color.h
1239 Enum
1240 Name(diagnostic_color_rule) Type(int)
1242 EnumValue
1243 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1245 EnumValue
1246 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1248 EnumValue
1249 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1251 fdiagnostics-parseable-fixits
1252 Common Var(flag_diagnostics_parseable_fixits)
1253 Print fix-it hints in machine-readable form.
1255 fdiagnostics-generate-patch
1256 Common Var(flag_diagnostics_generate_patch)
1257 Print fix-it hints to stderr in unified diff format.
1259 fdiagnostics-show-option
1260 Common Var(flag_diagnostics_show_option) Init(1)
1261 Amend appropriate diagnostic messages with the command line option that controls them.
1263 fdisable-
1264 Common Joined RejectNegative Var(common_deferred_options) Defer
1265 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass.
1267 fenable-
1268 Common Joined RejectNegative Var(common_deferred_options) Defer
1269 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass.
1271 fdump-
1272 Common Joined RejectNegative Var(common_deferred_options) Defer
1273 -fdump-<type>   Dump various compiler internals to a file.
1275 fdump-final-insns
1276 Driver RejectNegative
1278 fdump-final-insns=
1279 Common RejectNegative Joined Var(flag_dump_final_insns)
1280 -fdump-final-insns=filename     Dump to filename the insns at the end of translation.
1282 fdump-go-spec=
1283 Common RejectNegative Joined Var(flag_dump_go_spec)
1284 -fdump-go-spec=filename Write all declarations to file as Go code.
1286 fdump-noaddr
1287 Common Report Var(flag_dump_noaddr)
1288 Suppress output of addresses in debugging dumps.
1290 freport-bug
1291 Common Driver Var(flag_report_bug)
1292 Collect and dump debug information into temporary file if ICE in C/C++
1293 compiler occurred.
1295 fdump-internal-locations
1296 Common Var(flag_dump_locations) Init(0)
1297 Dump detailed information on GCC's internal representation of source code locations.
1299 fdump-passes
1300 Common Var(flag_dump_passes) Init(0)
1301 Dump optimization passes.
1303 fdump-unnumbered
1304 Common Report Var(flag_dump_unnumbered)
1305 Suppress output of instruction numbers, line number notes and addresses in debugging dumps.
1307 fdump-unnumbered-links
1308 Common Report Var(flag_dump_unnumbered_links)
1309 Suppress output of previous and next insn numbers in debugging dumps.
1311 fdwarf2-cfi-asm
1312 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1313 Enable CFI tables via GAS assembler directives.
1315 fearly-inlining
1316 Common Report Var(flag_early_inlining) Init(1) Optimization
1317 Perform early inlining.
1319 feliminate-dwarf2-dups
1320 Common Ignore
1321 Does nothing.  Preserved for backward compatibility.
1323 fipa-sra
1324 Common Report Var(flag_ipa_sra) Init(0) Optimization
1325 Perform interprocedural reduction of aggregates.
1327 feliminate-unused-debug-symbols
1328 Common Report Var(flag_debug_only_used_symbols)
1329 Perform unused symbol elimination in debug info.
1331 feliminate-unused-debug-types
1332 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1333 Perform unused type elimination in debug info.
1335 femit-class-debug-always
1336 Common Report Var(flag_emit_class_debug_always) Init(0)
1337 Do not suppress C++ class debug information.
1339 fexceptions
1340 Common Report Var(flag_exceptions) Optimization
1341 Enable exception handling.
1343 fexpensive-optimizations
1344 Common Report Var(flag_expensive_optimizations) Optimization
1345 Perform a number of minor, expensive optimizations.
1347 fexcess-precision=
1348 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT) SetByCombined
1349 -fexcess-precision=[fast|standard]      Specify handling of excess floating-point precision.
1351 Enum
1352 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1354 EnumValue
1355 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1357 EnumValue
1358 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1360 ; Whether we permit the extended set of values for FLT_EVAL_METHOD
1361 ; introduced in ISO/IEC TS 18661-3, or limit ourselves to those in C99/C11.
1362 fpermitted-flt-eval-methods=
1363 Common Joined RejectNegative Enum(permitted_flt_eval_methods) Var(flag_permitted_flt_eval_methods) Init(PERMITTED_FLT_EVAL_METHODS_DEFAULT)
1364 -fpermitted-flt-eval-methods=[c11|ts-18661]     Specify which values of FLT_EVAL_METHOD are permitted.
1366 Enum
1367 Name(permitted_flt_eval_methods) Type(enum permitted_flt_eval_methods) UnknownError(unknown specification for the set of FLT_EVAL_METHOD values to permit %qs)
1369 EnumValue
1370 Enum(permitted_flt_eval_methods) String(c11) Value(PERMITTED_FLT_EVAL_METHODS_C11)
1372 EnumValue
1373 Enum(permitted_flt_eval_methods) String(ts-18661-3) Value(PERMITTED_FLT_EVAL_METHODS_TS_18661)
1375 ffast-math
1376 Common Optimization
1378 ffat-lto-objects
1379 Common Var(flag_fat_lto_objects)
1380 Output lto objects containing both the intermediate language and binary output.
1382 ffinite-math-only
1383 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1384 Assume no NaNs or infinities are generated.
1386 ffixed-
1387 Common Joined RejectNegative Var(common_deferred_options) Defer
1388 -ffixed-<register>      Mark <register> as being unavailable to the compiler.
1390 ffloat-store
1391 Common Report Var(flag_float_store) Optimization
1392 Don't allocate floats and doubles in extended-precision registers.
1394 fforce-addr
1395 Common Ignore
1396 Does nothing.  Preserved for backward compatibility.
1398 fforward-propagate
1399 Common Report Var(flag_forward_propagate) Optimization
1400 Perform a forward propagation pass on RTL.
1402 ffp-contract=
1403 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST) Optimization
1404 -ffp-contract=[off|on|fast]     Perform floating-point expression contraction.
1406 Enum
1407 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1409 EnumValue
1410 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1412 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1413 EnumValue
1414 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1416 EnumValue
1417 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1419 ffp-int-builtin-inexact
1420 Common Report Var(flag_fp_int_builtin_inexact) Init(1) Optimization
1421 Allow built-in functions ceil, floor, round, trunc to raise \"inexact\" exceptions.
1423 ; Nonzero means don't put addresses of constant functions in registers.
1424 ; Used for compiling the Unix kernel, where strange substitutions are
1425 ; done on the assembly output.
1426 ffunction-cse
1427 Common Report Var(flag_no_function_cse,0) Optimization
1428 Allow function addresses to be held in registers.
1430 ffunction-sections
1431 Common Report Var(flag_function_sections)
1432 Place each function into its own section.
1434 fgcse
1435 Common Report Var(flag_gcse) Optimization
1436 Perform global common subexpression elimination.
1438 fgcse-lm
1439 Common Report Var(flag_gcse_lm) Init(1) Optimization
1440 Perform enhanced load motion during global common subexpression elimination.
1442 fgcse-sm
1443 Common Report Var(flag_gcse_sm) Init(0) Optimization
1444 Perform store motion after global common subexpression elimination.
1446 fgcse-las
1447 Common Report Var(flag_gcse_las) Init(0) Optimization
1448 Perform redundant load after store elimination in global common subexpression
1449 elimination.
1451 fgcse-after-reload
1452 Common Report Var(flag_gcse_after_reload) Optimization
1453 Perform global common subexpression elimination after register allocation has
1454 finished.
1456 Enum
1457 Name(dwarf_gnat_encodings) Type(int)
1459 EnumValue
1460 Enum(dwarf_gnat_encodings) String(all) Value(DWARF_GNAT_ENCODINGS_ALL)
1462 EnumValue
1463 Enum(dwarf_gnat_encodings) String(gdb) Value(DWARF_GNAT_ENCODINGS_GDB)
1465 EnumValue
1466 Enum(dwarf_gnat_encodings) String(minimal) Value(DWARF_GNAT_ENCODINGS_MINIMAL)
1468 fgnat-encodings=
1469 Common Enum(dwarf_gnat_encodings) Joined RejectNegative Report Undocumented Var(gnat_encodings)
1470 -fgnat-encodings=[all|gdb|minimal]      Select the balance between GNAT encodings and standard DWARF emitted in the debug information
1472 ; This option is not documented yet as its semantics will change.
1473 fgraphite
1474 Common Report Var(flag_graphite) Optimization
1475 Enable in and out of Graphite representation.
1477 fgraphite-identity
1478 Common Report Var(flag_graphite_identity) Optimization
1479 Enable Graphite Identity transformation.
1481 fhoist-adjacent-loads
1482 Common Report Var(flag_hoist_adjacent_loads) Optimization
1483 Enable hoisting adjacent loads to encourage generating conditional move
1484 instructions.
1486 fkeep-gc-roots-live
1487 Common Undocumented Report Var(flag_keep_gc_roots_live) Optimization
1488 ; Always keep a pointer to a live memory block
1490 floop-parallelize-all
1491 Common Report Var(flag_loop_parallelize_all) Optimization
1492 Mark all loops as parallel.
1494 floop-strip-mine
1495 Common Alias(floop-nest-optimize)
1496 Enable loop nest transforms.  Same as -floop-nest-optimize.
1498 floop-interchange
1499 Common Alias(floop-nest-optimize)
1500 Enable loop nest transforms.  Same as -floop-nest-optimize.
1502 floop-block
1503 Common Alias(floop-nest-optimize)
1504 Enable loop nest transforms.  Same as -floop-nest-optimize.
1506 floop-unroll-and-jam
1507 Common Alias(floop-nest-optimize)
1508 Enable loop nest transforms.  Same as -floop-nest-optimize.
1510 fgnu-tm
1511 Common Report Var(flag_tm)
1512 Enable support for GNU transactional memory.
1514 fgnu-unique
1515 Common Report Var(flag_gnu_unique) Init(1)
1516 Use STB_GNU_UNIQUE if supported by the assembler.
1518 floop-flatten
1519 Common Ignore
1520 Does nothing. Preserved for backward compatibility.
1522 floop-nest-optimize
1523 Common Report Var(flag_loop_nest_optimize) Optimization
1524 Enable the loop nest optimizer.
1526 fstrict-volatile-bitfields
1527 Common Report Var(flag_strict_volatile_bitfields) Init(-1) Optimization
1528 Force bitfield accesses to match their type width.
1530 fstore-merging
1531 Common Report Var(flag_store_merging) Optimization
1532 Merge adjacent stores.
1534 fguess-branch-probability
1535 Common Report Var(flag_guess_branch_prob) Optimization
1536 Enable guessing of branch probabilities.
1538 ; Nonzero means ignore `#ident' directives.  0 means handle them.
1539 ; Generate position-independent code for executables if possible
1540 ; On SVR4 targets, it also controls whether or not to emit a
1541 ; string identifying the compiler.
1542 fident
1543 Common Report Var(flag_no_ident,0)
1544 Process #ident directives.
1546 fif-conversion
1547 Common Report Var(flag_if_conversion) Optimization
1548 Perform conversion of conditional jumps to branchless equivalents.
1550 fif-conversion2
1551 Common Report Var(flag_if_conversion2) Optimization
1552 Perform conversion of conditional jumps to conditional execution.
1554 fstack-reuse=
1555 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL) Optimization
1556 -fstack-reuse=[all|named_vars|none]     Set stack reuse level for local variables.
1558 Enum
1559 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1561 EnumValue
1562 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1564 EnumValue
1565 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1567 EnumValue
1568 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1570 ftree-loop-if-convert
1571 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1572 Convert conditional jumps in innermost loops to branchless equivalents.
1574 ftree-loop-if-convert-stores
1575 Common Ignore
1576 Does nothing. Preserved for backward compatibility.
1578 ; -finhibit-size-directive inhibits output of .size for ELF.
1579 ; This is used only for compiling crtstuff.c,
1580 ; and it may be extended to other effects
1581 ; needed for crtstuff.c on other systems.
1582 finhibit-size-directive
1583 Common Report Var(flag_inhibit_size_directive)
1584 Do not generate .size directives.
1586 findirect-inlining
1587 Common Report Var(flag_indirect_inlining) Optimization
1588 Perform indirect inlining.
1590 ; General flag to enable inlining.  Specifying -fno-inline will disable
1591 ; all inlining apart from always-inline functions.
1592 finline
1593 Common Report Var(flag_no_inline,0) Init(0) Optimization
1594 Enable inlining of function declared \"inline\", disabling disables all inlining.
1596 finline-small-functions
1597 Common Report Var(flag_inline_small_functions) Optimization
1598 Integrate functions into their callers when code size is known not to grow.
1600 finline-functions
1601 Common Report Var(flag_inline_functions) Optimization
1602 Integrate functions not declared \"inline\" into their callers when profitable.
1604 finline-functions-called-once
1605 Common Report Var(flag_inline_functions_called_once) Optimization
1606 Integrate functions only required by their single caller.
1608 finline-limit-
1609 Common RejectNegative Joined Alias(finline-limit=)
1611 finline-limit=
1612 Common RejectNegative Joined UInteger
1613 -finline-limit=<number> Limit the size of inlined functions to <number>.
1615 finline-atomics
1616 Common Report Var(flag_inline_atomics) Init(1) Optimization
1617 Inline __atomic operations when a lock free instruction sequence is available.
1619 finstrument-functions
1620 Common Report Var(flag_instrument_function_entry_exit)
1621 Instrument function entry and exit with profiling calls.
1623 finstrument-functions-exclude-function-list=
1624 Common RejectNegative Joined
1625 -finstrument-functions-exclude-function-list=name,...  Do not instrument listed functions.
1627 finstrument-functions-exclude-file-list=
1628 Common RejectNegative Joined
1629 -finstrument-functions-exclude-file-list=filename,...  Do not instrument functions listed in files.
1631 fipa-cp
1632 Common Report Var(flag_ipa_cp) Optimization
1633 Perform interprocedural constant propagation.
1635 fipa-cp-clone
1636 Common Report Var(flag_ipa_cp_clone) Optimization
1637 Perform cloning to make Interprocedural constant propagation stronger.
1639 fipa-cp-alignment
1640 Common Ignore
1641 Does nothing.  Preserved for backward compatibility.
1643 fipa-bit-cp
1644 Common Report Var(flag_ipa_bit_cp) Optimization
1645 Perform interprocedural bitwise constant propagation.
1647 fipa-profile
1648 Common Report Var(flag_ipa_profile) Init(0) Optimization
1649 Perform interprocedural profile propagation.
1651 fipa-pta
1652 Common Report Var(flag_ipa_pta) Init(0) Optimization
1653 Perform interprocedural points-to analysis.
1655 fipa-pure-const
1656 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1657 Discover pure and const functions.
1659 fipa-icf
1660 Common Report Var(flag_ipa_icf) Optimization
1661 Perform Identical Code Folding for functions and read-only variables.
1663 fipa-icf-functions
1664 Common Report Var(flag_ipa_icf_functions) Optimization
1665 Perform Identical Code Folding for functions.
1667 fipa-icf-variables
1668 Common Report Var(flag_ipa_icf_variables) Optimization
1669 Perform Identical Code Folding for variables.
1671 fipa-reference
1672 Common Report Var(flag_ipa_reference) Init(0) Optimization
1673 Discover readonly and non addressable static variables.
1675 fipa-matrix-reorg
1676 Common Ignore
1677 Does nothing. Preserved for backward compatibility.
1679 fipa-struct-reorg
1680 Common Ignore
1681 Does nothing. Preserved for backward compatibility.
1683 fipa-vrp
1684 Common Report Var(flag_ipa_vrp) Optimization
1685 Perform IPA Value Range Propagation.
1687 fira-algorithm=
1688 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB) Optimization
1689 -fira-algorithm=[CB|priority]   Set the used IRA algorithm.
1691 Enum
1692 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1694 EnumValue
1695 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1697 EnumValue
1698 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1700 fira-region=
1701 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT) Optimization
1702 -fira-region=[one|all|mixed]    Set regions for IRA.
1704 Enum
1705 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1707 EnumValue
1708 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1710 EnumValue
1711 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1713 EnumValue
1714 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1716 fira-hoist-pressure
1717 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1718 Use IRA based register pressure calculation
1719 in RTL hoist optimizations.
1721 fira-loop-pressure
1722 Common Report Var(flag_ira_loop_pressure) Optimization
1723 Use IRA based register pressure calculation
1724 in RTL loop optimizations.
1726 fira-share-save-slots
1727 Common Report Var(flag_ira_share_save_slots) Init(1) Optimization
1728 Share slots for saving different hard registers.
1730 fira-share-spill-slots
1731 Common Report Var(flag_ira_share_spill_slots) Init(1) Optimization
1732 Share stack slots for spilled pseudo-registers.
1734 fira-verbose=
1735 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1736 -fira-verbose=<number>  Control IRA's level of diagnostic messages.
1738 fivopts
1739 Common Report Var(flag_ivopts) Init(1) Optimization
1740 Optimize induction variables on trees.
1742 fjump-tables
1743 Common Var(flag_jump_tables) Init(1) Optimization
1744 Use jump tables for sufficiently large switch statements.
1746 fkeep-inline-functions
1747 Common Report Var(flag_keep_inline_functions)
1748 Generate code for functions even if they are fully inlined.
1750 fkeep-static-functions
1751 Common Report Var(flag_keep_static_functions)
1752 Generate code for static functions even if they are never called.
1754 fkeep-static-consts
1755 Common Report Var(flag_keep_static_consts) Init(1)
1756 Emit static const variables even if they are not used.
1758 fleading-underscore
1759 Common Report Var(flag_leading_underscore) Init(-1)
1760 Give external symbols a leading underscore.
1762 floop-optimize
1763 Common Ignore
1764 Does nothing.  Preserved for backward compatibility.
1766 flra-remat
1767 Common Report Var(flag_lra_remat) Optimization
1768 Do CFG-sensitive rematerialization in LRA.
1770 flto
1771 Common
1772 Enable link-time optimization.
1774 flto=
1775 Common RejectNegative Joined Var(flag_lto)
1776 Link-time optimization with number of parallel jobs or jobserver.
1778 Enum
1779 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1781 EnumValue
1782 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1784 EnumValue
1785 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1787 EnumValue
1788 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1790 EnumValue
1791 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1793 EnumValue
1794 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1796 flto-partition=
1797 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1798 Specify the algorithm to partition symbols and vars at linktime.
1800 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1801 flto-compression-level=
1802 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1) IntegerRange(0, 9)
1803 -flto-compression-level=<number>        Use zlib compression level <number> for IL.
1805 flto-odr-type-merging
1806 Common Report Var(flag_lto_odr_type_mering) Init(1)
1807 Merge C++ types using One Definition Rule.
1809 flto-report
1810 Common Report Var(flag_lto_report) Init(0)
1811 Report various link-time optimization statistics.
1813 flto-report-wpa
1814 Common Report Var(flag_lto_report_wpa) Init(0)
1815 Report various link-time optimization statistics for WPA only.
1817 fmath-errno
1818 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1819 Set errno after built-in math functions.
1821 fmax-errors=
1822 Common Joined RejectNegative UInteger Var(flag_max_errors)
1823 -fmax-errors=<number>   Maximum number of errors to report.
1825 fmem-report
1826 Common Report Var(mem_report)
1827 Report on permanent memory allocation.
1829 fmem-report-wpa
1830 Common Report Var(mem_report_wpa)
1831 Report on permanent memory allocation in WPA only.
1833 ; This will attempt to merge constant section constants, if 1 only
1834 ; string constants and constants from constant pool, if 2 also constant
1835 ; variables.
1836 fmerge-all-constants
1837 Common Report Var(flag_merge_constants,2) Init(1)
1838 Attempt to merge identical constants and constant variables.
1840 fmerge-constants
1841 Common Report Var(flag_merge_constants,1)
1842 Attempt to merge identical constants across compilation units.
1844 fmerge-debug-strings
1845 Common Report Var(flag_merge_debug_strings) Init(1)
1846 Attempt to merge identical debug strings across compilation units.
1848 fmessage-length=
1849 Common RejectNegative Joined UInteger
1850 -fmessage-length=<number>       Limit diagnostics to <number> characters per line.  0 suppresses line-wrapping.
1852 fmodulo-sched
1853 Common Report Var(flag_modulo_sched) Optimization
1854 Perform SMS based modulo scheduling before the first scheduling pass.
1856 fmodulo-sched-allow-regmoves
1857 Common Report Var(flag_modulo_sched_allow_regmoves) Optimization
1858 Perform SMS based modulo scheduling with register moves allowed.
1860 fmove-loop-invariants
1861 Common Report Var(flag_move_loop_invariants) Optimization
1862 Move loop invariant computations out of loops.
1864 fdce
1865 Common Var(flag_dce) Init(1) Optimization
1866 Use the RTL dead code elimination pass.
1868 fdse
1869 Common Var(flag_dse) Init(1) Optimization
1870 Use the RTL dead store elimination pass.
1872 freschedule-modulo-scheduled-loops
1873 Common Report Var(flag_resched_modulo_sched) Optimization
1874 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling.
1876 fnon-call-exceptions
1877 Common Report Var(flag_non_call_exceptions) Optimization
1878 Support synchronous non-call exceptions.
1880 foffload=
1881 Common Driver Joined MissingArgError(options or targets missing after %qs)
1882 -foffload=<targets>=<options>  Specify offloading targets and options for them.
1884 foffload-abi=
1885 Common Joined RejectNegative Enum(offload_abi) Var(flag_offload_abi) Init(OFFLOAD_ABI_UNSET)
1886 -foffload-abi=[lp64|ilp32]     Set the ABI to use in an offload compiler.
1888 Enum
1889 Name(offload_abi) Type(enum offload_abi) UnknownError(unknown offload ABI %qs)
1891 EnumValue
1892 Enum(offload_abi) String(ilp32) Value(OFFLOAD_ABI_ILP32)
1894 EnumValue
1895 Enum(offload_abi) String(lp64) Value(OFFLOAD_ABI_LP64)
1897 fomit-frame-pointer
1898 Common Report Var(flag_omit_frame_pointer) Optimization
1899 When possible do not generate stack frames.
1901 fopt-info
1902 Common Report Var(flag_opt_info) Optimization
1903 Enable all optimization info dumps on stderr.
1905 fopt-info-
1906 Common Joined RejectNegative Var(common_deferred_options) Defer
1907 -fopt-info[-<type>=filename]    Dump compiler optimization details.
1909 foptimize-register-move
1910 Common Ignore
1911 Does nothing. Preserved for backward compatibility.
1913 foptimize-sibling-calls
1914 Common Report Var(flag_optimize_sibling_calls) Optimization
1915 Optimize sibling and tail recursive calls.
1917 fpartial-inlining
1918 Common Report Var(flag_partial_inlining) Optimization
1919 Perform partial inlining.
1921 fpre-ipa-mem-report
1922 Common Report Var(pre_ipa_mem_report)
1923 Report on memory allocation before interprocedural optimization.
1925 fpost-ipa-mem-report
1926 Common Report Var(post_ipa_mem_report)
1927 Report on memory allocation before interprocedural optimization.
1929 fpack-struct
1930 Common Report Var(flag_pack_struct) Optimization
1931 Pack structure members together without holes.
1933 fpack-struct=
1934 Common RejectNegative Joined UInteger Optimization
1935 -fpack-struct=<number>  Set initial maximum structure member alignment.
1937 fpcc-struct-return
1938 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1939 Return small aggregates in memory, not registers.
1941 fpeel-loops
1942 Common Report Var(flag_peel_loops) Optimization
1943 Perform loop peeling.
1945 fpeephole
1946 Common Report Var(flag_no_peephole,0) Optimization
1947 Enable machine specific peephole optimizations.
1949 fpeephole2
1950 Common Report Var(flag_peephole2) Optimization
1951 Enable an RTL peephole pass before sched2.
1953 fPIC
1954 Common Report Var(flag_pic,2) Negative(fPIE) Init(-1)
1955 Generate position-independent code if possible (large mode).
1957 fPIE
1958 Common Report Var(flag_pie,2) Negative(fpic) Init(-1)
1959 Generate position-independent code for executables if possible (large mode).
1961 fpic
1962 Common Report Var(flag_pic,1) Negative(fpie) Init(-1)
1963 Generate position-independent code if possible (small mode).
1965 fpie
1966 Common Report Var(flag_pie,1) Negative(fPIC) Init(-1)
1967 Generate position-independent code for executables if possible (small mode).
1969 fplt
1970 Common Report Var(flag_plt) Init(1) Optimization
1971 Use PLT for PIC calls (-fno-plt: load the address from GOT at call site).
1973 fplugin=
1974 Common Joined RejectNegative Var(common_deferred_options) Defer
1975 Specify a plugin to load.
1977 fplugin-arg-
1978 Common Joined RejectNegative Var(common_deferred_options) Defer
1979 -fplugin-arg-<name>-<key>[=<value>]     Specify argument <key>=<value> for plugin <name>.
1981 fpredictive-commoning
1982 Common Report Var(flag_predictive_commoning) Optimization
1983 Run predictive commoning optimization.
1985 fprefetch-loop-arrays
1986 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1987 Generate prefetch instructions, if available, for arrays in loops.
1989 fprofile
1990 Common Report Var(profile_flag)
1991 Enable basic program profiling code.
1993 fprofile-abs-path
1994 Common Report Var(profile_abs_path_flag)
1995 Generate absolute source path names for gcov.
1997 fprofile-arcs
1998 Common Report Var(profile_arc_flag)
1999 Insert arc-based program profiling code.
2001 fprofile-dir=
2002 Common Joined RejectNegative Var(profile_data_prefix)
2003 Set the top-level directory for storing the profile data.
2004 The default is 'pwd'.
2006 fprofile-correction
2007 Common Report Var(flag_profile_correction)
2008 Enable correction of flow inconsistent profile data input.
2010 fprofile-update=
2011 Common Joined RejectNegative Enum(profile_update) Var(flag_profile_update) Init(PROFILE_UPDATE_SINGLE)
2012 -fprofile-update=[single|atomic|prefer-atomic]  Set the profile update method.
2014 Enum
2015 Name(profile_update) Type(enum profile_update) UnknownError(unknown profile update method %qs)
2017 EnumValue
2018 Enum(profile_update) String(single) Value(PROFILE_UPDATE_SINGLE)
2020 EnumValue
2021 Enum(profile_update) String(atomic) Value(PROFILE_UPDATE_ATOMIC)
2023 EnumValue
2024 Enum(profile_update) String(prefer-atomic) Value(PROFILE_UPDATE_PREFER_ATOMIC)
2026 fprofile-generate
2027 Common
2028 Enable common options for generating profile info for profile feedback directed optimizations.
2030 fprofile-generate=
2031 Common Joined RejectNegative
2032 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=.
2034 fprofile-use
2035 Common Var(flag_profile_use)
2036 Enable common options for performing profile feedback directed optimizations.
2038 fprofile-use=
2039 Common Joined RejectNegative
2040 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=.
2042 fprofile-values
2043 Common Report Var(flag_profile_values)
2044 Insert code to profile values of expressions.
2046 fprofile-report
2047 Common Report Var(profile_report)
2048 Report on consistency of profile.
2050 fprofile-reorder-functions
2051 Common Report Var(flag_profile_reorder_functions)
2052 Enable function reordering that improves code placement.
2054 fpatchable-function-entry=
2055 Common Joined Optimization
2056 Insert NOP instructions at each function entry.
2058 frandom-seed
2059 Common Var(common_deferred_options) Defer
2061 frandom-seed=
2062 Common Joined RejectNegative Var(common_deferred_options) Defer
2063 -frandom-seed=<string>  Make compile reproducible using <string>.
2065 ; This switch causes the command line that was used to create an
2066 ; object file to be recorded into the object file.  The exact format
2067 ; of this recording is target and binary file format dependent.
2068 ; It is related to the -fverbose-asm switch, but that switch only
2069 ; records information in the assembler output file as comments, so
2070 ; they never reach the object file.
2071 frecord-gcc-switches
2072 Common Report Var(flag_record_gcc_switches)
2073 Record gcc command line switches in the object file.
2075 freg-struct-return
2076 Common Report Var(flag_pcc_struct_return,0) Optimization
2077 Return small aggregates in registers.
2079 fregmove
2080 Common Ignore
2081 Does nothing. Preserved for backward compatibility.
2083 flifetime-dse
2084 Common Report Var(flag_lifetime_dse,2) Init(2) Optimization
2085 Tell DSE that the storage for a C++ object is dead when the constructor
2086 starts and when the destructor finishes.
2088 flifetime-dse=
2089 Common Joined RejectNegative UInteger Var(flag_lifetime_dse) Optimization IntegerRange(0, 2)
2091 flive-range-shrinkage
2092 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
2093 Relief of register pressure through live range shrinkage.
2095 frename-registers
2096 Common Report Var(flag_rename_registers) Init(2) Optimization
2097 Perform a register renaming optimization pass.
2099 fschedule-fusion
2100 Common Report Var(flag_schedule_fusion) Init(2) Optimization
2101 Perform a target dependent instruction fusion optimization pass.
2103 freorder-blocks
2104 Common Report Var(flag_reorder_blocks) Optimization
2105 Reorder basic blocks to improve code placement.
2107 freorder-blocks-algorithm=
2108 Common Joined RejectNegative Enum(reorder_blocks_algorithm) Var(flag_reorder_blocks_algorithm) Init(REORDER_BLOCKS_ALGORITHM_SIMPLE) Optimization
2109 -freorder-blocks-algorithm=[simple|stc] Set the used basic block reordering algorithm.
2111 Enum
2112 Name(reorder_blocks_algorithm) Type(enum reorder_blocks_algorithm) UnknownError(unknown basic block reordering algorithm %qs)
2114 EnumValue
2115 Enum(reorder_blocks_algorithm) String(simple) Value(REORDER_BLOCKS_ALGORITHM_SIMPLE)
2117 EnumValue
2118 Enum(reorder_blocks_algorithm) String(stc) Value(REORDER_BLOCKS_ALGORITHM_STC)
2120 freorder-blocks-and-partition
2121 Common Report Var(flag_reorder_blocks_and_partition) Optimization
2122 Reorder basic blocks and partition into hot and cold sections.
2124 freorder-functions
2125 Common Report Var(flag_reorder_functions) Optimization
2126 Reorder functions to improve code placement.
2128 frerun-cse-after-loop
2129 Common Report Var(flag_rerun_cse_after_loop) Optimization
2130 Add a common subexpression elimination pass after loop optimizations.
2132 frerun-loop-opt
2133 Common Ignore
2134 Does nothing.  Preserved for backward compatibility.
2136 frounding-math
2137 Common Report Var(flag_rounding_math) Optimization SetByCombined
2138 Disable optimizations that assume default FP rounding behavior.
2140 fsched-interblock
2141 Common Report Var(flag_schedule_interblock) Init(1) Optimization
2142 Enable scheduling across basic blocks.
2144 fsched-pressure
2145 Common Report Var(flag_sched_pressure) Init(0) Optimization
2146 Enable register pressure sensitive insn scheduling.
2148 fsched-spec
2149 Common Report Var(flag_schedule_speculative) Init(1) Optimization
2150 Allow speculative motion of non-loads.
2152 fsched-spec-load
2153 Common Report Var(flag_schedule_speculative_load) Optimization
2154 Allow speculative motion of some loads.
2156 fsched-spec-load-dangerous
2157 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
2158 Allow speculative motion of more loads.
2160 fsched-verbose=
2161 Common RejectNegative Joined UInteger Var(sched_verbose_param) Init(1)
2162 -fsched-verbose=<number>        Set the verbosity level of the scheduler.
2164 fsched2-use-superblocks
2165 Common Report Var(flag_sched2_use_superblocks) Optimization
2166 If scheduling post reload, do superblock scheduling.
2168 fsched2-use-traces
2169 Common Ignore
2170 Does nothing.  Preserved for backward compatibility.
2172 fschedule-insns
2173 Common Report Var(flag_schedule_insns) Optimization
2174 Reschedule instructions before register allocation.
2176 fschedule-insns2
2177 Common Report Var(flag_schedule_insns_after_reload) Optimization
2178 Reschedule instructions after register allocation.
2180 ; This flag should be on when a target implements non-trivial
2181 ; scheduling hooks, maybe saving some information for its own sake.
2182 ; On IA64, for example, this is used for correct bundling.
2183 fselective-scheduling
2184 Common Report Var(flag_selective_scheduling) Optimization
2185 Schedule instructions using selective scheduling algorithm.
2187 fselective-scheduling2
2188 Common Report Var(flag_selective_scheduling2) Optimization
2189 Run selective scheduling after reload.
2191 fself-test=
2192 Common Undocumented Joined Var(flag_self_test)
2193 Run self-tests, using the given path to locate test files.
2195 fsel-sched-pipelining
2196 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
2197 Perform software pipelining of inner loops during selective scheduling.
2199 fsel-sched-pipelining-outer-loops
2200 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
2201 Perform software pipelining of outer loops during selective scheduling.
2203 fsel-sched-reschedule-pipelined
2204 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
2205 Reschedule pipelined regions without pipelining.
2207 fsemantic-interposition
2208 Common Report Var(flag_semantic_interposition) Init(1)
2209 Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker.
2211 ; sched_stalled_insns means that insns can be moved prematurely from the queue
2212 ; of stalled insns into the ready list.
2213 fsched-stalled-insns
2214 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
2215 Allow premature scheduling of queued insns.
2217 fsched-stalled-insns=
2218 Common RejectNegative Joined UInteger Optimization
2219 -fsched-stalled-insns=<number>  Set number of queued insns that can be prematurely scheduled.
2221 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
2222 ; be examined for a dependency on a stalled insn that is candidate for
2223 ; premature removal from the queue of stalled insns into the ready list (has
2224 ; an effect only if the flag 'sched_stalled_insns' is set).
2225 fsched-stalled-insns-dep
2226 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
2227 Set dependence distance checking in premature scheduling of queued insns.
2229 fsched-stalled-insns-dep=
2230 Common RejectNegative Joined UInteger Optimization
2231 -fsched-stalled-insns-dep=<number>      Set dependence distance checking in premature scheduling of queued insns.
2233 fsched-group-heuristic
2234 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
2235 Enable the group heuristic in the scheduler.
2237 fsched-critical-path-heuristic
2238 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
2239 Enable the critical path heuristic in the scheduler.
2241 fsched-spec-insn-heuristic
2242 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
2243 Enable the speculative instruction heuristic in the scheduler.
2245 fsched-rank-heuristic
2246 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
2247 Enable the rank heuristic in the scheduler.
2249 fsched-last-insn-heuristic
2250 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
2251 Enable the last instruction heuristic in the scheduler.
2253 fsched-dep-count-heuristic
2254 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
2255 Enable the dependent count heuristic in the scheduler.
2257 fsection-anchors
2258 Common Report Var(flag_section_anchors) Optimization
2259 Access data in the same section from shared anchor points.
2261 fsee
2262 Common Ignore
2263 Does nothing.  Preserved for backward compatibility.
2265 fzee
2266 Common Ignore
2267 Does nothing.  Preserved for backward compatibility.
2269 free
2270 Common Report Var(flag_ree) Init(0)
2271 Turn on Redundant Extensions Elimination pass.
2273 fshow-column
2274 Common Report Var(flag_show_column) Init(1)
2275 Show column numbers in diagnostics, when available.  Default on.
2277 fshrink-wrap
2278 Common Report Var(flag_shrink_wrap) Optimization
2279 Emit function prologues only before parts of the function that need it,
2280 rather than at the top of the function.
2282 fshrink-wrap-separate
2283 Common Report Var(flag_shrink_wrap_separate) Init(1) Optimization
2284 Shrink-wrap parts of the prologue and epilogue separately.
2286 fsignaling-nans
2287 Common Report Var(flag_signaling_nans) Optimization SetByCombined
2288 Disable optimizations observable by IEEE signaling NaNs.
2290 fsigned-zeros
2291 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
2292 Disable floating point optimizations that ignore the IEEE signedness of zero.
2294 fsingle-precision-constant
2295 Common Report Var(flag_single_precision_constant) Optimization
2296 Convert floating point constants to single precision constants.
2298 fsplit-ivs-in-unroller
2299 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
2300 Split lifetimes of induction variables when loops are unrolled.
2302 fsplit-stack
2303 Common Report Var(flag_split_stack) Init(-1)
2304 Generate discontiguous stack frames.
2306 fsplit-wide-types
2307 Common Report Var(flag_split_wide_types) Optimization
2308 Split wide types into independent registers.
2310 fssa-backprop
2311 Common Report Var(flag_ssa_backprop) Init(1) Optimization
2312 Enable backward propagation of use properties at the SSA level.
2314 fssa-phiopt
2315 Common Report Var(flag_ssa_phiopt) Optimization
2316 Optimize conditional patterns using SSA PHI nodes.
2318 fstdarg-opt
2319 Common Report Var(flag_stdarg_opt) Init(1) Optimization
2320 Optimize amount of stdarg registers saved to stack at start of function.
2322 fvariable-expansion-in-unroller
2323 Common Report Var(flag_variable_expansion_in_unroller) Optimization
2324 Apply variable expansion when loops are unrolled.
2326 fstack-check=
2327 Common Report RejectNegative Joined Optimization
2328 -fstack-check=[no|generic|specific]     Insert stack checking code into the program.
2330 fstack-check
2331 Common Alias(fstack-check=, specific, no)
2332 Insert stack checking code into the program.  Same as -fstack-check=specific.
2334 fstack-clash-protection
2335 Common Report Var(flag_stack_clash_protection) Optimization
2336 Insert code to probe each page of stack space as it is allocated to protect
2337 from stack-clash style attacks.
2339 fstack-limit
2340 Common Var(common_deferred_options) Defer
2342 fstack-limit-register=
2343 Common RejectNegative Joined Var(common_deferred_options) Defer
2344 -fstack-limit-register=<register>       Trap if the stack goes past <register>.
2346 fstack-limit-symbol=
2347 Common RejectNegative Joined Var(common_deferred_options) Defer
2348 -fstack-limit-symbol=<name>     Trap if the stack goes past symbol <name>.
2350 fstack-protector
2351 Common Report Var(flag_stack_protect, 1) Init(-1) Optimization
2352 Use propolice as a stack protection method.
2354 fstack-protector-all
2355 Common Report RejectNegative Var(flag_stack_protect, 2) Init(-1) Optimization
2356 Use a stack protection method for every function.
2358 fstack-protector-strong
2359 Common Report RejectNegative Var(flag_stack_protect, 3) Init(-1) Optimization
2360 Use a smart stack protection method for certain functions.
2362 fstack-protector-explicit
2363 Common Report RejectNegative Var(flag_stack_protect, 4) Optimization
2364 Use stack protection method only for functions with the stack_protect attribute.
2366 fstack-usage
2367 Common RejectNegative Var(flag_stack_usage)
2368 Output stack usage information on a per-function basis.
2370 fstrength-reduce
2371 Common Ignore
2372 Does nothing.  Preserved for backward compatibility.
2374 ; Nonzero if we should do (language-dependent) alias analysis.
2375 ; Typically, this analysis will assume that expressions of certain
2376 ; types do not alias expressions of certain other types.  Only used
2377 ; if alias analysis (in general) is enabled.
2378 fstrict-aliasing
2379 Common Report Var(flag_strict_aliasing) Optimization
2380 Assume strict aliasing rules apply.
2382 fstrict-overflow
2383 Common NegativeAlias Alias(fwrapv)
2384 Treat signed overflow as undefined.  Negated as -fwrapv.
2386 fsync-libcalls
2387 Common Report Var(flag_sync_libcalls) Init(1)
2388 Implement __atomic operations via libcalls to legacy __sync functions.
2390 fsyntax-only
2391 Common Report Var(flag_syntax_only)
2392 Check for syntax errors, then stop.
2394 ftest-coverage
2395 Common Report Var(flag_test_coverage)
2396 Create data files needed by \"gcov\".
2398 fthread-jumps
2399 Common Report Var(flag_thread_jumps) Optimization
2400 Perform jump threading optimizations.
2402 ftime-report
2403 Common Report Var(time_report)
2404 Report the time taken by each compiler pass.
2406 ftime-report-details
2407 Common Report Var(time_report_details)
2408 Record times taken by sub-phases separately.
2410 ftls-model=
2411 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2412 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec]      Set the default thread-local storage code generation model.
2414 Enum
2415 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2417 EnumValue
2418 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2420 EnumValue
2421 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2423 EnumValue
2424 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2426 EnumValue
2427 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2429 ftoplevel-reorder
2430 Common Report Var(flag_toplevel_reorder) Init(2)
2431 Reorder top level functions, variables, and asms.
2433 ftracer
2434 Common Report Var(flag_tracer) Optimization
2435 Perform superblock formation via tail duplication.
2437 ftrampolines
2438 Common Report Var(flag_trampolines) Init(0)
2439 For targets that normally need trampolines for nested functions, always
2440 generate them instead of using descriptors.
2442 ; Zero means that floating-point math operations cannot generate a
2443 ; (user-visible) trap.  This is the case, for example, in nonstop
2444 ; IEEE 754 arithmetic.
2445 ftrapping-math
2446 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2447 Assume floating-point operations can trap.
2449 ftrapv
2450 Common Report Var(flag_trapv) Optimization
2451 Trap for signed overflow in addition, subtraction and multiplication.
2453 ftree-ccp
2454 Common Report Var(flag_tree_ccp) Optimization
2455 Enable SSA-CCP optimization on trees.
2457 ftree-bit-ccp
2458 Common Report Var(flag_tree_bit_ccp) Optimization
2459 Enable SSA-BIT-CCP optimization on trees.
2461 ftree-store-ccp
2462 Common Ignore
2463 Does nothing.  Preserved for backward compatibility.
2465 ftree-ch
2466 Common Report Var(flag_tree_ch) Optimization
2467 Enable loop header copying on trees.
2469 ftree-coalesce-inlined-vars
2470 Common Ignore RejectNegative
2471 Does nothing.  Preserved for backward compatibility.
2473 ftree-coalesce-vars
2474 Common Report Var(flag_tree_coalesce_vars) Optimization
2475 Enable SSA coalescing of user variables.
2477 ftree-copyrename
2478 Common Ignore
2479 Does nothing.  Preserved for backward compatibility.
2481 ftree-copy-prop
2482 Common Report Var(flag_tree_copy_prop) Optimization
2483 Enable copy propagation on trees.
2485 ftree-store-copy-prop
2486 Common Ignore
2487 Does nothing.  Preserved for backward compatibility.
2489 ftree-cselim
2490 Common Report Var(flag_tree_cselim) Init(2) Optimization
2491 Transform condition stores into unconditional ones.
2493 ftree-switch-conversion
2494 Common Report Var(flag_tree_switch_conversion) Optimization
2495 Perform conversions of switch initializations.
2497 ftree-dce
2498 Common Report Var(flag_tree_dce) Optimization
2499 Enable SSA dead code elimination optimization on trees.
2501 ftree-dominator-opts
2502 Common Report Var(flag_tree_dom) Optimization
2503 Enable dominator optimizations.
2505 ftree-tail-merge
2506 Common Report Var(flag_tree_tail_merge) Optimization
2507 Enable tail merging on trees.
2509 ftree-dse
2510 Common Report Var(flag_tree_dse) Optimization
2511 Enable dead store elimination.
2513 ftree-forwprop
2514 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2515 Enable forward propagation on trees.
2517 ftree-fre
2518 Common Report Var(flag_tree_fre) Optimization
2519 Enable Full Redundancy Elimination (FRE) on trees.
2521 foptimize-strlen
2522 Common Report Var(flag_optimize_strlen) Optimization
2523 Enable string length optimizations on trees.
2525 fisolate-erroneous-paths-dereference
2526 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2527 Detect paths that trigger erroneous or undefined behavior due to
2528 dereferencing a null pointer.  Isolate those paths from the main control
2529 flow and turn the statement with erroneous or undefined behavior into a trap.
2531 fisolate-erroneous-paths-attribute
2532 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2533 Detect paths that trigger erroneous or undefined behavior due to a null value
2534 being used in a way forbidden by a returns_nonnull or nonnull
2535 attribute.  Isolate those paths from the main control flow and turn the
2536 statement with erroneous or undefined behavior into a trap.
2538 ftree-loop-distribution
2539 Common Report Var(flag_tree_loop_distribution) Optimization
2540 Enable loop distribution on trees.
2542 ftree-loop-distribute-patterns
2543 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2544 Enable loop distribution for patterns transformed into a library call.
2546 ftree-loop-im
2547 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2548 Enable loop invariant motion on trees.
2550 ftree-loop-linear
2551 Common Alias(floop-nest-optimize)
2552 Enable loop nest transforms.  Same as -floop-nest-optimize.
2554 ftree-loop-ivcanon
2555 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2556 Create canonical induction variables in loops.
2558 ftree-loop-optimize
2559 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2560 Enable loop optimizations on tree level.
2562 ftree-parallelize-loops=
2563 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1) Optimization
2564 -ftree-parallelize-loops=<number>       Enable automatic parallelization of loops.
2566 ftree-phiprop
2567 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2568 Enable hoisting loads from conditional pointers.
2570 ftree-pre
2571 Common Report Var(flag_tree_pre) Optimization
2572 Enable SSA-PRE optimization on trees.
2574 ftree-partial-pre
2575 Common Report Var(flag_tree_partial_pre) Optimization
2576 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination.
2578 ftree-pta
2579 Common Report Var(flag_tree_pta) Optimization
2580 Perform function-local points-to analysis on trees.
2582 ftree-reassoc
2583 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2584 Enable reassociation on tree level.
2586 ftree-salias
2587 Common Ignore
2588 Does nothing.  Preserved for backward compatibility.
2590 ftree-sink
2591 Common Report Var(flag_tree_sink) Optimization
2592 Enable SSA code sinking on trees.
2594 ftree-slsr
2595 Common Report Var(flag_tree_slsr) Optimization
2596 Perform straight-line strength reduction.
2598 ftree-sra
2599 Common Report Var(flag_tree_sra) Optimization
2600 Perform scalar replacement of aggregates.
2602 ftree-ter
2603 Common Report Var(flag_tree_ter) Optimization
2604 Replace temporary expressions in the SSA->normal pass.
2606 ftree-lrs
2607 Common Report Var(flag_tree_live_range_split) Optimization
2608 Perform live range splitting during the SSA->normal pass.
2610 ftree-vrp
2611 Common Report Var(flag_tree_vrp) Init(0) Optimization
2612 Perform Value Range Propagation on trees.
2614 fsplit-paths
2615 Common Report Var(flag_split_paths) Init(0) Optimization
2616 Split paths leading to loop backedges.
2618 funconstrained-commons
2619 Common Var(flag_unconstrained_commons) Optimization
2620 Assume common declarations may be overridden with ones with a larger
2621 trailing array.
2623 funit-at-a-time
2624 Common Report Var(flag_unit_at_a_time) Init(1)
2625 Compile whole compilation unit at a time.
2627 funroll-loops
2628 Common Report Var(flag_unroll_loops) Optimization
2629 Perform loop unrolling when iteration count is known.
2631 funroll-all-loops
2632 Common Report Var(flag_unroll_all_loops) Optimization
2633 Perform loop unrolling for all loops.
2635 ; Nonzero means that loop optimizer may assume that the induction variables
2636 ; that control loops do not overflow and that the loops with nontrivial
2637 ; exit condition are not infinite
2638 funsafe-loop-optimizations
2639 Common Ignore
2640 Does nothing.  Preserved for backward compatibility.
2642 fassociative-math
2643 Common Report Var(flag_associative_math) SetByCombined Optimization
2644 Allow optimization for floating-point arithmetic which may change the
2645 result of the operation due to rounding.
2647 freciprocal-math
2648 Common Report Var(flag_reciprocal_math) SetByCombined Optimization
2649 Same as -fassociative-math for expressions which include division.
2651 ; Nonzero means that unsafe floating-point math optimizations are allowed
2652 ; for the sake of speed.  IEEE compliance is not guaranteed, and operations
2653 ; are allowed to assume that their arguments and results are "normal"
2654 ; (e.g., nonnegative for SQRT).
2655 funsafe-math-optimizations
2656 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2657 Allow math optimizations that may violate IEEE or ISO standards.
2659 funswitch-loops
2660 Common Report Var(flag_unswitch_loops) Optimization
2661 Perform loop unswitching.
2663 fsplit-loops
2664 Common Report Var(flag_split_loops) Optimization
2665 Perform loop splitting.
2667 funwind-tables
2668 Common Report Var(flag_unwind_tables) Optimization
2669 Just generate unwind tables for exception handling.
2671 fuse-ld=bfd
2672 Common Driver Negative(fuse-ld=gold)
2673 Use the bfd linker instead of the default linker.
2675 fuse-ld=gold
2676 Common Driver Negative(fuse-ld=bfd)
2677 Use the gold linker instead of the default linker.
2679 fuse-linker-plugin
2680 Common Undocumented Var(flag_use_linker_plugin)
2682 ; Positive if we should track variables, negative if we should run
2683 ; the var-tracking pass only to discard debug annotations, zero if
2684 ; we're not to run it.  When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2685 ; will be set according to optimize, debug_info_level and debug_hooks
2686 ; in process_options ().
2687 fvar-tracking
2688 Common Report Var(flag_var_tracking) Init(2) PerFunction
2689 Perform variable tracking.
2691 ; Positive if we should track variables at assignments, negative if
2692 ; we should run the var-tracking pass only to discard debug
2693 ; annotations.  When flag_var_tracking_assignments ==
2694 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2695 fvar-tracking-assignments
2696 Common Report Var(flag_var_tracking_assignments) Init(2) PerFunction
2697 Perform variable tracking by annotating assignments.
2699 ; Nonzero if we should toggle flag_var_tracking_assignments after
2700 ; processing options and computing its default.  */
2701 fvar-tracking-assignments-toggle
2702 Common Report Var(flag_var_tracking_assignments_toggle) PerFunction
2703 Toggle -fvar-tracking-assignments.
2705 ; Positive if we should track uninitialized variables, negative if
2706 ; we should run the var-tracking pass only to discard debug
2707 ; annotations.  When flag_var_tracking_uninit == AUTODETECT_VALUE it
2708 ; will be set according to flag_var_tracking.
2709 fvar-tracking-uninit
2710 Common Report Var(flag_var_tracking_uninit) PerFunction
2711 Perform variable tracking and also tag variables that are uninitialized.
2713 ; Alias to enable both -ftree-loop-vectorize and -ftree-slp-vectorize.
2714 ftree-vectorize
2715 Common Report Optimization
2716 Enable vectorization on trees.
2718 ftree-vectorizer-verbose=
2719 Common Joined RejectNegative Ignore
2720 Does nothing.  Preserved for backward compatibility.
2722 ftree-loop-vectorize
2723 Common Report Var(flag_tree_loop_vectorize) Optimization EnabledBy(ftree-vectorize)
2724 Enable loop vectorization on trees.
2726 ftree-slp-vectorize
2727 Common Report Var(flag_tree_slp_vectorize) Optimization EnabledBy(ftree-vectorize)
2728 Enable basic block vectorization (SLP) on trees.
2730 fvect-cost-model=
2731 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT) Optimization
2732 Specifies the cost model for vectorization.
2733 -fvect-cost-model=[unlimited|dynamic|cheap]     Specifies the cost model for vectorization.
2735 fsimd-cost-model=
2736 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED) Optimization
2737 -fsimd-cost-model=[unlimited|dynamic|cheap]     Specifies the vectorization cost model for code marked with a simd directive.
2739 Enum
2740 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2742 EnumValue
2743 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2745 EnumValue
2746 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2748 EnumValue
2749 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2751 fvect-cost-model
2752 Common Alias(fvect-cost-model=,dynamic,unlimited)
2753 Enables the dynamic vectorizer cost model.  Preserved for backward compatibility.
2755 ftree-vect-loop-version
2756 Common Ignore
2757 Does nothing. Preserved for backward compatibility.
2759 ftree-scev-cprop
2760 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2761 Enable copy propagation of scalar-evolution information.
2763 ; -fverbose-asm causes extra commentary information to be produced in
2764 ; the generated assembly code (to make it more readable).  This option
2765 ; is generally only of use to those who actually need to read the
2766 ; generated assembly code (perhaps while debugging the compiler itself).
2767 ; -fno-verbose-asm, the default, causes the extra information
2768 ; to not be added and is useful when comparing two assembler files.
2769 fverbose-asm
2770 Common Report Var(flag_verbose_asm)
2771 Add extra commentary to assembler output.
2773 fvisibility=
2774 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2775 -fvisibility=[default|internal|hidden|protected]        Set the default symbol visibility.
2777 Enum
2778 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2780 EnumValue
2781 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2783 EnumValue
2784 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2786 EnumValue
2787 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2789 EnumValue
2790 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2792 fvtable-verify=
2793 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2794 Validate vtable pointers before using them.
2796 Enum
2797 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2799 EnumValue
2800 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2802 EnumValue
2803 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2805 EnumValue
2806 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2808 fvtv-counts
2809 Common Var(flag_vtv_counts)
2810 Output vtable verification counters.
2812 fvtv-debug
2813 Common Var(flag_vtv_debug)
2814 Output vtable verification pointer sets information.
2816 fvpt
2817 Common Report Var(flag_value_profile_transformations) Optimization
2818 Use expression value profiles in optimizations.
2820 fweb
2821 Common Report Var(flag_web) Init(2) Optimization
2822 Construct webs and split unrelated uses of single variable.
2824 ftree-builtin-call-dce
2825 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2826 Enable conditional dead code elimination for builtin calls.
2828 fwhole-program
2829 Common Report Var(flag_whole_program) Init(0)
2830 Perform whole program optimizations.
2832 fwrapv
2833 Common Report Var(flag_wrapv) Optimization
2834 Assume signed arithmetic overflow wraps around.
2836 fzero-initialized-in-bss
2837 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2838 Put zero initialized data in the bss section.
2841 Common Driver RejectNegative JoinedOrMissing
2842 Generate debug information in default format.
2844 gcoff
2845 Common Driver JoinedOrMissing Negative(gdwarf)
2846 Generate debug information in COFF format.
2848 gcolumn-info
2849 Common Driver Var(debug_column_info,1) Init(0)
2850 Record DW_AT_decl_column and DW_AT_call_column in DWARF.
2852 gdwarf
2853 Common Driver JoinedOrMissing Negative(gdwarf-)
2854 Generate debug information in default version of DWARF format.
2856 gdwarf-
2857 Common Driver Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2858 Generate debug information in DWARF v2 (or later) format.
2860 ggdb
2861 Common Driver JoinedOrMissing
2862 Generate debug information in default extended format.
2864 gno-
2865 RejectNegative Joined Undocumented
2866 ; Catch the gno- prefix, so it doesn't backtrack to g<level>.
2868 gno-pubnames
2869 Common Driver Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2870 Don't generate DWARF pubnames and pubtypes sections.
2872 gpubnames
2873 Common Driver Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2874 Generate DWARF pubnames and pubtypes sections.
2876 ggnu-pubnames
2877 Common Driver Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2878 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2880 grecord-gcc-switches
2881 Common Driver Var(dwarf_record_gcc_switches) Init(1)
2882 Record gcc command line switches in DWARF DW_AT_producer.
2884 gsplit-dwarf
2885 Common Driver Var(dwarf_split_debug_info) Init(0)
2886 Generate debug information in separate .dwo files.
2888 gstabs
2889 Common Driver JoinedOrMissing Negative(gstabs+)
2890 Generate debug information in STABS format.
2892 gstabs+
2893 Common Driver JoinedOrMissing Negative(gvms)
2894 Generate debug information in extended STABS format.
2896 gstrict-dwarf
2897 Common Driver Report Var(dwarf_strict) Init(0)
2898 Don't emit DWARF additions beyond selected version.
2900 gtoggle
2901 Common Driver Report Var(flag_gtoggle)
2902 Toggle debug information generation.
2904 gvms
2905 Common Driver JoinedOrMissing Negative(gxcoff)
2906 Generate debug information in VMS format.
2908 gxcoff
2909 Common Driver JoinedOrMissing Negative(gxcoff+)
2910 Generate debug information in XCOFF format.
2912 gxcoff+
2913 Common Driver JoinedOrMissing Negative(gcoff)
2914 Generate debug information in extended XCOFF format.
2916 Enum
2917 Name(compressed_debug_sections) Type(int)
2919 ; Since -gz= is completely handled in specs, the values aren't used and we
2920 ; assign arbitrary constants.
2921 EnumValue
2922 Enum(compressed_debug_sections) String(none) Value(0)
2924 EnumValue
2925 Enum(compressed_debug_sections) String(zlib) Value(1)
2927 EnumValue
2928 Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
2931 Common Driver
2932 Generate compressed debug sections.
2935 Common Driver RejectNegative Joined Enum(compressed_debug_sections)
2936 -gz=<format>    Generate compressed debug sections in format <format>.
2939 Driver Joined Separate
2941 iplugindir=
2942 Common Joined Var(plugindir_string) Init(0)
2943 -iplugindir=<dir>       Set <dir> to be the default plugin directory.
2945 imultiarch
2946 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2947 -imultiarch <dir>       Set <dir> to be the multiarch include subdirectory.
2950 Driver Joined Separate
2953 Driver
2955 no-canonical-prefixes
2956 Driver
2958 nodefaultlibs
2959 Driver
2961 nostartfiles
2962 Driver
2964 nostdlib
2965 Driver
2968 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2969 -o <file>       Place output into <file>.
2972 Common Var(profile_flag)
2973 Enable function profiling.
2975 pass-exit-codes
2976 Driver Var(pass_exit_codes)
2978 pedantic
2979 Common Alias(Wpedantic)
2981 pedantic-errors
2982 Common Var(flag_pedantic_errors)
2983 Like -pedantic but issue them as errors.
2986 Driver
2988 pipe
2989 Driver Var(use_pipes)
2991 print-file-name=
2992 Driver JoinedOrMissing Var(print_file_name)
2994 print-libgcc-file-name
2995 Driver
2997 print-multi-directory
2998 Driver Var(print_multi_directory)
3000 print-multi-lib
3001 Driver Var(print_multi_lib)
3003 print-multi-os-directory
3004 Driver Var(print_multi_os_directory)
3006 print-multiarch
3007 Driver Var(print_multiarch)
3009 print-prog-name=
3010 Driver JoinedOrMissing Var(print_prog_name)
3012 print-search-dirs
3013 Driver Var(print_search_dirs)
3015 print-sysroot
3016 Driver Var(print_sysroot)
3018 print-sysroot-headers-suffix
3019 Driver Var(print_sysroot_headers_suffix)
3021 quiet
3022 Common Var(quiet_flag) RejectDriver
3023 Do not display functions compiled or elapsed time.
3026 Driver
3029 Driver
3031 save-temps
3032 Driver
3034 save-temps=
3035 Driver Joined
3038 Driver
3040 time
3041 Driver Var(report_times)
3043 time=
3044 Driver JoinedOrMissing
3047 Driver Joined Separate
3049 undef
3050 Driver
3051 ; C option, but driver must not handle as "-u ndef".
3054 Common Driver Var(verbose_flag)
3055 Enable verbose output.
3057 version
3058 Common Var(version_flag) RejectDriver
3059 Display the compiler's version.
3062 Common Var(inhibit_warnings)
3063 Suppress warnings.
3065 wrapper
3066 Driver Separate Var(wrapper_string)
3069 Driver Joined Separate
3071 shared
3072 Driver RejectNegative Negative(static-pie)
3073 Create a shared library.
3075 shared-libgcc
3076 Driver
3078 specs
3079 Driver Separate Alias(specs=)
3081 specs=
3082 Driver Joined
3084 static
3085 Driver
3087 static-libgcc
3088 Driver
3090 static-libgfortran
3091 Driver
3092 ; Documented for Fortran, but always accepted by driver.
3094 static-libstdc++
3095 Driver
3097 static-libgo
3098 Driver
3099 ; Documented for Go, but always accepted by driver.
3101 static-libasan
3102 Driver
3104 static-libtsan
3105 Driver
3107 static-liblsan
3108 Driver
3110 static-libubsan
3111 Driver
3113 symbolic
3114 Driver
3116 no-pie
3117 Driver RejectNegative Negative(shared)
3118 Don't create a dynamically linked position independent executable.
3121 Driver RejectNegative Negative(no-pie)
3122 Create a dynamically linked position independent executable.
3124 static-pie
3125 Driver RejectNegative Negative(pie)
3126 Create a static position independent executable.
3129 Driver Joined Separate
3131 fipa-ra
3132 Common Report Var(flag_ipa_ra) Optimization
3133 Use caller save register across calls if possible.
3135 ; This comment is to ensure we retain the blank line above.