1 ; Options for the language- and target-independent parts of the compiler.
3 ; Copyright (C) 2003-2019 Free Software Foundation, Inc.
5 ; This file is part of GCC.
7 ; GCC is free software; you can redistribute it and/or modify it under
8 ; the terms of the GNU General Public License as published by the Free
9 ; Software Foundation; either version 3, or (at your option) any later
12 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 ; You should have received a copy of the GNU General Public License
18 ; along with GCC; see the file COPYING3. If not see
19 ; <http://www.gnu.org/licenses/>.
21 ; See the GCC internals manual (options.texi) for a description of this file's format.
23 ; Please try to keep this file in ASCII collating order.
37 ; Not used directly to control optimizations, only to save -Ofast
38 ; setting for "optimize" attributes.
42 ; True if this is the lto front end. This is used to disable gimple
43 ; generation and lowering passes that are normally run on the output
44 ; of a front end. These passes must be bypassed for lto since they
45 ; have already been done before the gimple was written.
49 ; 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) and 2 indicates that the IL is going to be linked and
52 ; and output to LTO object file.
54 enum incremental_link flag_incremental_link = INCREMENTAL_LINK_NONE
56 ; 0 means straightforward implementation of complex divide acceptable.
57 ; 1 means wide ranges of inputs must work for complex divide.
58 ; 2 means C99-like requirements for complex multiply and divide.
60 int flag_complex_method = 1
62 ; Language specific warning pass for unused results.
64 bool flag_warn_unused_result = false
69 ; Nonzero if we should write GIMPLE bytecode for link-time optimization.
73 ; Nonzero if we should write GIMPLE bytecode for offload compilation.
75 int flag_generate_offload = 0
77 ; Nonzero means we should be saving declaration info into a .X file.
79 int flag_gen_aux_info = 0
81 ; Nonzero if we are compiling code for a shared library, zero for
86 ; These two are really VEC(char_p,heap) *.
89 void *flag_instrument_functions_exclude_functions
92 void *flag_instrument_functions_exclude_files
94 ; Generic structs (e.g. templates not explicitly specialized)
95 ; may not have a compilation unit associated with them, and so
96 ; may need to be treated differently from ordinary structs.
98 ; Structs only handled by reference (indirectly), will also usually
99 ; not need as much debugging information.
102 enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
105 enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
107 ; True if we should exit after parsing options.
109 bool exit_after_options
111 ; Type(s) of debugging information we are producing (if any). See
112 ; flag-types.h for the definitions of the different possible types of
113 ; debugging information.
115 enum debug_info_type write_symbols = NO_DEBUG
117 ; Level of debugging information we are producing. See flag-types.h
118 ; for the definitions of the different possible levels.
120 enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
122 ; Nonzero means use GNU-only extensions in the generated symbolic
123 ; debugging information. Currently, this only has an effect when
124 ; write_symbols is set to DBX_DEBUG or XCOFF_DEBUG.
126 bool use_gnu_debug_info_extensions
128 ; Original value of maximum field alignment in bytes, specified via
129 ; -fpack-struct=<value>.
131 unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
133 ; Type of stack check.
135 enum stack_check_type flag_stack_check = NO_STACK_CHECK
137 ; True if stack usage information needs to be computed.
139 bool flag_stack_usage_info = false
141 ; -dA causes debug commentary information to be produced in
142 ; the generated assembly code (to make it more readable). This option
143 ; is generally only of use to those who actually need to read the
144 ; generated assembly code (perhaps while debugging the compiler itself).
145 ; Currently, this switch is only used by dwarf2out.c; however, it is intended
146 ; to be a catchall for printing debug information in the assembler file.
150 ; How many NOP insns to place at each function entry by default
152 HOST_WIDE_INT function_entry_patch_area_size
154 ; And how far the real asm entry point is into this area
156 HOST_WIDE_INT function_entry_patch_area_start
158 ; Balance between GNAT encodings and standard DWARF to emit.
160 enum dwarf_gnat_encodings gnat_encodings = DWARF_GNAT_ENCODINGS_DEFAULT
162 ; -dP causes the rtl to be emitted as a comment in assembly.
164 int flag_dump_rtl_in_asm
166 ; Whether -da was passed (used only in handle_common_deferred_options).
168 bool flag_dump_all_passed
170 ; Other flags saying which kinds of debugging dump have been requested.
173 int rtl_dump_and_exit
176 int flag_print_asm_name
178 ; Name of top-level original source file (what was input to cpp).
179 ; This comes from the #-command at the beginning of the actual input.
180 ; If there isn't any there, then this is the cc1 input file name.
182 const char *main_input_filename
184 ; Pointer to base name in main_input_filename, with directories and a
185 ; single final extension removed, and the length of this base
189 const char *main_input_basename
192 int main_input_baselength
194 ; Which options have been printed by --help.
198 ; Which enums have been printed by --help. 0 = not printed, no
199 ; relevant options seen, 1 = relevant option seen, not yet printed, 2
202 char *help_enum_printed
204 ; The number of columns for --help output.
206 unsigned int help_columns
208 ; Whether this options structure has been through finish_options
210 bool flag_opts_finished
212 ; What the sanitizer should instrument
214 unsigned int flag_sanitize
216 ; What sanitizers should recover from errors
218 unsigned int flag_sanitize_recover = (SANITIZE_UNDEFINED | SANITIZE_UNDEFINED_NONDEFAULT | SANITIZE_KERNEL_ADDRESS) & ~(SANITIZE_UNREACHABLE | SANITIZE_RETURN)
220 ; What the coverage sanitizers should instrument
222 unsigned int flag_sanitize_coverage
224 ; Flag whether a prefix has been added to dump_base_name
226 bool dump_base_name_prefixed = false
228 ; Flag whether HSA generation has been explicitely disabled
230 bool flag_disable_hsa = false
242 Common Driver Joined Undocumented
243 Provide bash completion for options starting with provided string.
246 Driver Alias(coverage)
252 Common Separate Alias(d)
255 Common Joined Alias(d)
258 Common Separate Alias(dumpbase)
261 Common Separate Alias(dumpdir)
264 Driver Separate Alias(e)
267 Driver Joined Alias(e)
270 Common Warning Alias(Wextra)
273 Driver Separate Alias(Xassembler)
276 Driver JoinedOrMissing Alias(Xassembler)
279 Driver Separate Alias(Xlinker)
282 Driver JoinedOrMissing Alias(Xlinker)
285 Driver Separate Alias(u)
288 Driver Joined Alias(u)
291 Common Driver Var(help_flag)
292 Display this information.
295 Common Driver Report Joined
296 --help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params.
299 Driver Separate Alias(x)
302 Driver Joined Alias(x)
305 Driver Separate Alias(L)
308 Driver Joined Alias(L)
310 -no-canonical-prefixes
311 Driver Alias(no-canonical-prefixes)
313 -no-standard-libraries
314 Driver Alias(nostdlib)
317 Driver Var(no_sysroot_suffix)
326 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
329 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
332 Driver Alias(pass-exit-codes)
335 Common Alias(Wpedantic)
338 Common Alias(pedantic-errors)
344 Driver Alias(static-pie)
350 Driver Separate Alias(B)
353 Driver JoinedOrMissing Alias(B)
359 Driver Separate Alias(print-file-name=)
362 Driver JoinedOrMissing Alias(print-file-name=)
364 -print-libgcc-file-name
365 Driver Alias(print-libgcc-file-name)
367 -print-multi-directory
368 Driver Alias(print-multi-directory)
371 Driver Alias(print-multi-lib)
373 -print-multi-os-directory
374 Driver Alias(print-multi-os-directory)
377 Driver Alias(print-multiarch)
380 Driver Separate Alias(print-prog-name=)
383 Driver JoinedOrMissing Alias(print-prog-name=)
386 Driver Alias(print-search-dirs)
389 Driver Alias(print-sysroot)
391 -print-sysroot-headers-suffix
392 Driver Alias(print-sysroot-headers-suffix)
398 Driver Alias(save-temps)
404 Driver Separate Alias(specs=)
407 Driver Joined Alias(specs=)
413 Driver Alias(symbolic)
417 Alias for --help=target.
425 ;; The driver used to convert options such as --help into forms such
426 ;; as -fhelp; the following four entries are for compatibility with
427 ;; any direct uses of those (undocumented) -f forms
429 Common Driver Alias(-help)
432 Common Driver Joined Alias(-help=)
435 Common Driver Alias(-target-help)
438 Common Driver Alias(-version)
442 --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters.
445 Common Joined Alias(-param)
448 Driver Separate Alias(-sysroot=)
451 Driver JoinedOrMissing
457 Driver Joined Separate
463 Driver Joined Separate
469 Common JoinedOrMissing Optimization
470 -O<number> Set optimization level to <number>.
474 Optimize for space rather than speed.
478 Optimize for speed disregarding exact standards compliance.
482 Optimize for debugging experience rather than speed or size.
494 Driver Joined Separate
500 Driver Joined Separate
521 Common RejectNegative Warning Alias(Wextra)
522 This switch is deprecated; use -Wextra instead.
525 Driver JoinedOrMissing RejectNegative
528 Driver JoinedOrMissing RejectNegative
531 Driver JoinedOrMissing RejectNegative
534 Common Var(warn_aggregate_return) Warning
535 Warn about returning structures, unions or arrays.
537 Waggressive-loop-optimizations
538 Common Var(warn_aggressive_loop_optimizations) Init(1) Warning
539 Warn if a loop with constant number of iterations triggers undefined behavior.
542 Common Var(warn_array_bounds) Warning
543 Warn if an array is accessed out of bounds.
546 Common Joined RejectNegative UInteger Var(warn_array_bounds) Warning IntegerRange(0, 2)
547 Warn if an array is accessed out of bounds.
550 Common Var(warn_attributes) Init(1) Warning
551 Warn about inappropriate attribute usage.
554 Common Alias(Wattribute_alias=, 1, 0) Warning
555 Warn about type safety and similar errors and mismatches in declarations with alias attributes.
558 Common Joined RejectNegative UInteger Var(warn_attribute_alias) Init(1) Warning IntegerRange(0, 2)
559 Warn about type safety and similar errors and mismatches in declarations with alias attributes.
562 Common Var(warn_cannot_profile) Init(1) Warning
563 Warn when profiling instrumentation was requested, but could not be applied to
567 Common Var(warn_cast_align) Warning
568 Warn about pointer casts which increase alignment.
571 Common Var(warn_cast_align,2) Warning
572 Warn about pointer casts which increase alignment.
575 Common Var(warn_cpp) Init(1) Warning
576 Warn when a #warning directive is encountered.
579 Common Var(warn_attribute_warning) Init(1) Warning
580 Warn about uses of __attribute__((warning)) declarations.
583 Common Var(warn_deprecated) Init(1) Warning
584 Warn if a deprecated compiler feature, class, method, or field is used.
586 Wdeprecated-declarations
587 Common Var(warn_deprecated_decl) Init(1) Warning
588 Warn about uses of __attribute__((deprecated)) declarations.
590 Wdisabled-optimization
591 Common Var(warn_disabled_optimization) Warning
592 Warn when an optimization pass is disabled.
595 Common Var(warnings_are_errors)
596 Treat all warnings as errors.
600 Treat specified warning as error.
603 Common Var(extra_warnings) Warning
604 Print extra (possibly unwanted) warnings.
607 Common Var(flag_fatal_errors)
608 Exit on the first error occurred.
611 Common RejectNegative Joined Host_Wide_Int ByteSize Warning Var(warn_frame_larger_than_size) Init(HOST_WIDE_INT_MAX)
612 -Wframe-larger-than=<byte-size> Warn if a function's stack frame requires in excess of <byte-size>.
615 Common Var(warn_free_nonheap_object) Init(1) Warning
616 Warn when attempting to free a non-heap object.
619 Common Var(warn_hsa) Init(1) Warning
620 Warn when a function cannot be expanded to HSAIL.
622 Wimplicit-fallthrough
623 Common Alias(Wimplicit-fallthrough=,3,0) Warning
625 Wimplicit-fallthrough=
626 Common Var(warn_implicit_fallthrough) RejectNegative Joined UInteger Warning IntegerRange(0, 5)
627 Warn when a switch case falls through.
630 Common Var(warn_inline) Warning
631 Warn when an inlined function cannot be inlined.
633 Winvalid-memory-model
634 Common Var(warn_invalid_memory_model) Init(1) Warning
635 Warn when an atomic memory model parameter is known to be outside the valid range.
638 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
641 Common RejectNegative Joined Host_Wide_Int ByteSize Warning Var(warn_larger_than_size) Init(HOST_WIDE_INT_MAX)
642 -Wlarger-than=<byte-size> Warn if an object's size exceeds <byte-size>.
645 Var(warn_nonnull_compare) Warning
646 Warn if comparing pointer parameter with nonnull attribute with NULL.
649 Common Var(warn_null_dereference) Warning
650 Warn if dereferencing a NULL pointer may lead to erroneous or undefined behavior.
652 Wunsafe-loop-optimizations
653 Common Ignore Warning
654 Does nothing. Preserved for backward compatibility.
657 Common Warning Alias(Wsuggest-attribute=noreturn)
660 Common Var(warn_odr_violations) Init(1) Warning
661 Warn about some C++ One Definition Rule violations during link time optimization.
664 Common Var(warn_overflow) Init(1) Warning
665 Warn about overflow in arithmetic expressions.
668 Common Var(warn_lto_type_mismatch) Init(1) Warning
669 During link time optimization warn about mismatched types of global declarations.
672 Common Var(warn_packed) Warning
673 Warn when the packed attribute has no effect on struct layout.
676 Common Var(warn_padded) Warning
677 Warn when padding is required to align structure members.
680 Common Var(pedantic) Init(0) Warning
681 Issue warnings needed for strict compliance to the standard.
684 Common Var(warn_return_local_addr) Init(1) Warning
685 Warn about returning a pointer/reference to a local or temporary variable.
688 Common Var(warn_shadow) Warning
689 Warn when one variable shadows another. Same as -Wshadow=global.
692 Common Warning Alias(Wshadow)
693 Warn when one variable shadows another (globally).
696 Common Var(warn_shadow_local) Warning EnabledBy(Wshadow)
697 Warn when one local variable shadows another local variable or parameter.
700 Common Warning Undocumented Alias(Wshadow=local)
702 Wshadow=compatible-local
703 Common Var(warn_shadow_compatible_local) Warning EnabledBy(Wshadow=local)
704 Warn when one local variable shadows another local variable or parameter of compatible type.
706 Wshadow-compatible-local
707 Common Warning Undocumented Alias(Wshadow=compatible-local)
710 Common Var(warn_stack_protect) Warning
711 Warn when not issuing stack smashing protection for some reason.
714 Common Joined RejectNegative Host_Wide_Int ByteSize Var(warn_stack_usage) Warning Init(HOST_WIDE_INT_MAX)
715 -Wstack-usage=<byte-size> Warn if stack usage might exceed <byte-size>.
719 Warn about code which might break strict aliasing rules.
722 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
723 Warn about code which might break strict aliasing rules.
727 Warn about optimizations that assume that signed overflow is undefined.
730 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
731 Warn about optimizations that assume that signed overflow is undefined.
733 Wsuggest-attribute=cold
734 Common Var(warn_suggest_attribute_cold) Warning
735 Warn about functions which might be candidates for __attribute__((cold)).
737 Wsuggest-attribute=const
738 Common Var(warn_suggest_attribute_const) Warning
739 Warn about functions which might be candidates for __attribute__((const)).
741 Wsuggest-attribute=pure
742 Common Var(warn_suggest_attribute_pure) Warning
743 Warn about functions which might be candidates for __attribute__((pure)).
745 Wsuggest-attribute=noreturn
746 Common Var(warn_suggest_attribute_noreturn) Warning
747 Warn about functions which might be candidates for __attribute__((noreturn)).
749 Wsuggest-attribute=malloc
750 Common Var(warn_suggest_attribute_malloc) Warning
751 Warn about functions which might be candidates for __attribute__((malloc)).
754 Common Var(warn_suggest_final_types) Warning
755 Warn about C++ polymorphic types where adding final keyword would improve code quality.
757 Wsuggest-final-methods
758 Common Var(warn_suggest_final_methods) Warning
759 Warn about C++ virtual methods where adding final keyword would improve code quality.
762 Common Var(warn_switch_unreachable) Warning Init(1)
763 Warn about statements between switch's controlling expression and the first
767 Common Var(warn_system_headers) Warning
768 Do not suppress warnings from system headers.
771 Common Var(warn_trampolines) Warning
772 Warn whenever a trampoline is generated.
775 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
776 Warn if a comparison is always true or always false due to the limited range of the data type.
779 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
780 Warn about uninitialized automatic variables.
783 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
784 Warn about maybe uninitialized automatic variables.
787 Common Ignore Warning
788 Does nothing. Preserved for backward compatibility.
791 Common Var(warn_unused) Init(0) Warning
792 Enable all -Wunused- warnings.
794 Wunused-but-set-parameter
795 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
796 Warn when a function parameter is only set, otherwise unused.
798 Wunused-but-set-variable
799 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
800 Warn when a variable is only set, otherwise unused.
803 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
804 Warn when a function is unused.
807 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
808 Warn when a label is unused.
811 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
812 Warn when a function parameter is unused.
815 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
816 Warn when an expression value is unused.
819 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
820 Warn when a variable is unused.
823 Common Var(warn_coverage_mismatch) Init(1) Warning
824 Warn in case profiles in -fprofile-use do not match.
827 Common Var(warn_missing_profile) Init(1) Warning
828 Warn in case profiles in -fprofile-use do not exist.
830 Wvector-operation-performance
831 Common Var(warn_vector_operation_performance) Warning
832 Warn when a vector operation is compiled outside the SIMD.
847 Common Separate Var(aux_info_file_name)
848 -aux-info <file> Emit declaration information into <file>.
851 Common Joined Alias(aux-info)
854 Common Separate RejectDriver Var(aux_base_name)
857 Common Separate RejectDriver
867 -d<letters> Enable dumps from specific passes of the compiler.
870 Common Separate Var(dump_base_name)
871 -dumpbase <file> Set the file basename to be used for dumps.
874 Common Separate Var(dump_dir_name)
875 -dumpdir <dir> Set the directory name to be used for dumps.
890 Driver Joined Separate
892 ; This option has historically been passed down to the linker by an
893 ; accident of a %{e*} spec, so ensure it continues to be passed down
894 ; as a single option. The supported option for this purpose is
895 ; -rdynamic. See PR 47390.
899 ; The version of the C++ ABI in use. The following values are allowed:
901 ; 0: The version of the ABI believed most conformant with the C++ ABI
902 ; specification. This ABI may change as bugs are discovered and fixed.
903 ; Therefore, 0 will not necessarily indicate the same ABI in different
906 ; 1: The version of the ABI first used in G++ 3.2. No longer selectable.
908 ; 2: The version of the ABI first used in G++ 3.4, and the default
911 ; 3: The version of the ABI that fixes the missing underscore
912 ; in template non-type arguments of pointer type.
914 ; 4: The version of the ABI that introduces unambiguous mangling of
915 ; vector types. First selectable in G++ 4.5.
917 ; 5: The version of the ABI that ignores attribute const/noreturn
918 ; in function pointer mangling, and corrects mangling of decltype and
919 ; function parameters used in other parameters and the return type.
920 ; First selectable in G++ 4.6.
922 ; 6: The version of the ABI that doesn't promote scoped enums to int and
923 ; changes the mangling of template argument packs, const/static_cast,
924 ; prefix ++ and --, and a class scope function used as a template
926 ; First selectable in G++ 4.7.
928 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
929 ; corrects the mangling of lambdas in default argument scope.
930 ; First selectable in G++ 4.8.
932 ; 8: The version of the ABI that corrects the substitution behavior of
933 ; function types with function-cv-qualifiers.
934 ; First selectable in G++ 4.9 and default in G++ 5.
936 ; 9: The version of the ABI that corrects the alignment of nullptr_t.
937 ; First selectable and default in G++ 5.2.
939 ; 10: The version of the ABI that mangles attributes that affect type
940 ; identity, such as ia32 calling convention attributes (stdcall, etc.)
941 ; Default in G++ 6 (set in c_common_post_options).
943 ; 11: The version of the ABI that corrects mangling of sizeof... expressions
944 ; and introduces new inheriting constructor handling.
947 ; 12: Corrects the calling convention for classes with only deleted copy/move
948 ; constructors and changes passing/returning of empty records.
949 ; Default in G++ 8.1.
951 ; 13: Fixes the accidental change in 12 to the calling convention for classes
952 ; with deleted copy constructor and trivial move constructor.
953 ; Default in G++ 8.2.
954 ; 14: Corrects the mangling of nullptr expression.
957 ; Additional positive integers will be assigned as new versions of
958 ; the ABI become the default version of the ABI.
960 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(0)
961 The version of the C++ ABI in use.
963 faggressive-loop-optimizations
964 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
965 Aggressively optimize loops using language constraints.
968 Common Report Var(flag_align_functions) Optimization
969 Align the start of functions.
972 Common RejectNegative Joined Var(str_align_functions) Optimization
974 flimit-function-alignment
975 Common Report Var(flag_limit_function_alignment) Optimization Init(0)
978 Common Report Var(flag_align_jumps) Optimization
979 Align labels which are only reached by jumping.
982 Common RejectNegative Joined Var(str_align_jumps) Optimization
985 Common Report Var(flag_align_labels) Optimization
989 Common RejectNegative Joined Var(str_align_labels) Optimization
992 Common Report Var(flag_align_loops) Optimization
993 Align the start of loops.
996 Common RejectNegative Joined Var(str_align_loops) Optimization
998 fallow-store-data-races
999 Common Report Var(flag_store_data_races) Optimization
1000 Allow the compiler to introduce new data races on stores.
1004 Does nothing. Preserved for backward compatibility.
1008 Does nothing. Preserved for backward compatibility.
1010 fargument-noalias-global
1012 Does nothing. Preserved for backward compatibility.
1014 fargument-noalias-anything
1016 Does nothing. Preserved for backward compatibility.
1019 Common Driver Report Joined
1020 Select what to sanitize.
1023 Common Report Joined
1024 Select type of coverage sanitization.
1026 fasan-shadow-offset=
1027 Common Joined RejectNegative Var(common_deferred_options) Defer
1028 -fasan-shadow-offset=<number> Use custom shadow memory offset.
1031 Common Joined RejectNegative Var(common_deferred_options) Defer
1032 -fsanitize-sections=<sec1,sec2,...> Sanitize global variables
1033 in user-defined sections.
1036 Common Report Joined
1037 After diagnosing undefined behavior attempt to continue execution.
1041 This switch is deprecated; use -fsanitize-recover= instead.
1043 fsanitize-address-use-after-scope
1044 Common Driver Report Var(flag_sanitize_address_use_after_scope) Init(0)
1046 fsanitize-undefined-trap-on-error
1047 Common Driver Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
1048 Use trap instead of a library function for undefined behavior sanitization.
1050 fasynchronous-unwind-tables
1051 Common Report Var(flag_asynchronous_unwind_tables) Optimization
1052 Generate unwind tables that are exact at each instruction boundary.
1055 Common Report Var(flag_auto_inc_dec) Init(1) Optimization
1056 Generate auto-inc/dec instructions.
1059 Common Report Var(flag_auto_profile)
1060 Use sample profile information for call graph node weights. The default
1061 profile file is fbdata.afdo in 'pwd'.
1064 Common Joined RejectNegative Var(auto_profile_file)
1065 Use sample profile information for call graph node weights. The profile
1066 file is specified in the argument.
1068 ; -fcheck-bounds causes gcc to generate array bounds checks.
1069 ; For C, C++ and ObjC: defaults off.
1070 ; For Java: defaults to on.
1071 ; For Fortran: defaults to off.
1073 Common Report Var(flag_bounds_check)
1074 Generate code to check bounds before indexing arrays.
1077 Common Report Var(flag_branch_on_count_reg) Optimization
1078 Replace add, compare, branch with branch on count register.
1080 fbranch-probabilities
1081 Common Report Var(flag_branch_probabilities) Optimization
1082 Use profiling information for branch probabilities.
1084 fbranch-target-load-optimize
1086 Does nothing. Preserved for backward compatibility.
1088 fbranch-target-load-optimize2
1090 Does nothing. Preserved for backward compatibility.
1094 Does nothing. Preserved for backward compatibility.
1097 Common Report RejectNegative Var(flag_callgraph_info) Init(NO_CALLGRAPH_INFO);
1098 Output callgraph information on a per-file basis.
1101 Common Report RejectNegative Joined
1102 Output callgraph information on a per-file basis with decorations.
1105 Common Joined RejectNegative Var(common_deferred_options) Defer
1106 -fcall-saved-<register> Mark <register> as being preserved across functions.
1109 Common Joined RejectNegative Var(common_deferred_options) Defer
1110 -fcall-used-<register> Mark <register> as being corrupted by function calls.
1112 ; Nonzero for -fcaller-saves: allocate values in regs that need to
1113 ; be saved across function calls, if that produces overall better code.
1114 ; Optional now, so people can test it.
1116 Common Report Var(flag_caller_saves) Optimization
1117 Save registers around function calls.
1121 This switch is deprecated; do not use.
1124 Common Var(flag_check_new)
1125 Check the return value of new in C++.
1128 Common Var(flag_checking) Init(CHECKING_P ? ENABLE_EXTRA_CHECKING ? 2 : 1 : 0)
1129 Perform internal consistency checkings.
1132 Common Joined RejectNegative UInteger Var(flag_checking)
1133 Perform internal consistency checkings.
1136 Common Report Var(flag_code_hoisting) Optimization
1137 Enable code hoisting.
1139 fcombine-stack-adjustments
1140 Common Report Var(flag_combine_stack_adjustments) Optimization
1141 Looks for opportunities to reduce stack adjustments and stack references.
1144 Common Report Var(flag_no_common,0)
1145 Put uninitialized globals in the common section.
1149 ; Converted by the driver to -fcompare-debug= options.
1152 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
1153 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump.
1155 fcompare-debug-second
1156 Common Driver RejectNegative Var(flag_compare_debug)
1157 Run only the second compilation of -fcompare-debug.
1160 Common Report Var(flag_compare_elim_after_reload) Optimization
1161 Perform comparison elimination after register allocation has finished.
1164 Common Var(flag_conserve_stack) Optimization
1165 Do not perform optimizations increasing noticeably stack usage.
1168 Common Report Var(flag_cprop_registers) Optimization
1169 Perform a register copy-propagation optimization pass.
1172 Common Report Var(flag_crossjumping) Optimization
1173 Perform cross-jumping optimization.
1176 Common Report Var(flag_cse_follow_jumps) Optimization
1177 When running CSE, follow jumps to their targets.
1181 Does nothing. Preserved for backward compatibility.
1184 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
1185 Omit range reduction step when performing complex division.
1188 Common Report Var(flag_cx_fortran_rules) Optimization
1189 Complex multiplication and division follow Fortran rules.
1192 Common Report Var(flag_data_sections)
1193 Place data items into their own section.
1196 Common Report Var(common_deferred_options) Defer
1197 List all available debugging counters with their limits and counts.
1200 Common RejectNegative Joined Var(common_deferred_options) Defer
1201 -fdbg-cnt=<counter>[:<lower_limit>]:<upper_limit>[,<counter>:...] Set the debug counter limit.
1204 Common Joined RejectNegative Var(common_deferred_options) Defer
1205 -fdebug-prefix-map=<old>=<new> Map one directory name to another in debug information.
1208 Common Joined RejectNegative Var(common_deferred_options) Defer
1209 -ffile-prefix-map=<old>=<new> Map one directory name to another in compilation result.
1211 fdebug-types-section
1212 Common Report Var(flag_debug_types_section) Init(0)
1213 Output .debug_types section when using DWARF v4 debuginfo.
1215 ; Nonzero for -fdefer-pop: don't pop args after each function call
1216 ; instead save them up to pop many calls' args with one insns.
1218 Common Report Var(flag_defer_pop) Optimization
1219 Defer popping functions args from stack until later.
1222 Common Report Var(flag_delayed_branch) Optimization
1223 Attempt to fill delay slots of branch instructions.
1225 fdelete-dead-exceptions
1226 Common Report Var(flag_delete_dead_exceptions) Init(0) Optimization
1227 Delete dead instructions that may throw exceptions.
1229 fdelete-null-pointer-checks
1230 Common Report Var(flag_delete_null_pointer_checks) Init(-1) Optimization
1231 Delete useless null pointer checks.
1233 fdevirtualize-at-ltrans
1234 Common Report Var(flag_ltrans_devirtualize)
1235 Stream extra data to support more aggressive devirtualization in LTO local transformation mode.
1237 fdevirtualize-speculatively
1238 Common Report Var(flag_devirtualize_speculatively) Optimization
1239 Perform speculative devirtualization.
1242 Common Report Var(flag_devirtualize) Optimization
1243 Try to convert virtual calls to direct ones.
1245 fdiagnostics-show-location=
1246 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1247 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics.
1249 ; Required for these enum values.
1254 Name(diagnostic_prefixing_rule) Type(int)
1257 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1260 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1262 fdiagnostics-show-caret
1263 Common Var(flag_diagnostics_show_caret) Init(1)
1264 Show the source line with a caret indicating the column.
1266 fdiagnostics-show-labels
1267 Common Var(flag_diagnostics_show_labels) Init(1)
1268 Show labels annotating ranges of source code when showing source.
1270 fdiagnostics-show-line-numbers
1271 Common Var(flag_diagnostics_show_line_numbers) Init(1)
1272 Show line numbers in the left margin when showing source.
1275 Common Alias(fdiagnostics-color=,always,never)
1279 Driver Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1280 -fdiagnostics-color=[never|always|auto] Colorize diagnostics.
1282 ; Required for these enum values.
1287 Name(diagnostic_color_rule) Type(int)
1290 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1293 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1296 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1299 Driver Common Joined RejectNegative Var(flag_diagnostics_show_urls) Enum(diagnostic_url_rule) Init(DIAGNOSTICS_URL_AUTO)
1300 -fdiagnostics-urls=[never|always|auto] Embed URLs in diagnostics.
1302 ; Required for these enum values.
1307 Name(diagnostic_url_rule) Type(int)
1310 Enum(diagnostic_url_rule) String(never) Value(DIAGNOSTICS_URL_NO)
1313 Enum(diagnostic_url_rule) String(always) Value(DIAGNOSTICS_URL_YES)
1316 Enum(diagnostic_url_rule) String(auto) Value(DIAGNOSTICS_URL_AUTO)
1318 fdiagnostics-format=
1319 Common Joined RejectNegative Enum(diagnostics_output_format)
1320 -fdiagnostics-format=[text|json] Select output format.
1322 ; Required for these enum values.
1327 Name(diagnostics_output_format) Type(int)
1330 Enum(diagnostics_output_format) String(text) Value(DIAGNOSTICS_OUTPUT_FORMAT_TEXT)
1333 Enum(diagnostics_output_format) String(json) Value(DIAGNOSTICS_OUTPUT_FORMAT_JSON)
1335 fdiagnostics-parseable-fixits
1336 Common Var(flag_diagnostics_parseable_fixits)
1337 Print fix-it hints in machine-readable form.
1339 fdiagnostics-generate-patch
1340 Common Var(flag_diagnostics_generate_patch)
1341 Print fix-it hints to stderr in unified diff format.
1343 fdiagnostics-show-option
1344 Common Var(flag_diagnostics_show_option) Init(1)
1345 Amend appropriate diagnostic messages with the command line option that controls them.
1347 fdiagnostics-minimum-margin-width=
1348 Common Joined UInteger Var(diagnostics_minimum_margin_width) Init(6)
1349 Set minimum width of left margin of source code when showing source.
1352 Common Joined RejectNegative Var(common_deferred_options) Defer
1353 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass.
1356 Common Joined RejectNegative Var(common_deferred_options) Defer
1357 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass.
1360 Common Joined RejectNegative Var(common_deferred_options) Defer
1361 -fdump-<type> Dump various compiler internals to a file.
1364 Driver RejectNegative
1367 Common RejectNegative Joined Var(flag_dump_final_insns)
1368 -fdump-final-insns=filename Dump to filename the insns at the end of translation.
1371 Common RejectNegative Joined Var(flag_dump_go_spec)
1372 -fdump-go-spec=filename Write all declarations to file as Go code.
1375 Common Report Var(flag_dump_noaddr)
1376 Suppress output of addresses in debugging dumps.
1379 Common Driver Var(flag_report_bug)
1380 Collect and dump debug information into temporary file if ICE in C/C++
1383 fdump-internal-locations
1384 Common Var(flag_dump_locations) Init(0)
1385 Dump detailed information on GCC's internal representation of source code locations.
1388 Common Var(flag_dump_passes) Init(0)
1389 Dump optimization passes.
1392 Common Report Var(flag_dump_unnumbered)
1393 Suppress output of instruction numbers, line number notes and addresses in debugging dumps.
1395 fdump-unnumbered-links
1396 Common Report Var(flag_dump_unnumbered_links)
1397 Suppress output of previous and next insn numbers in debugging dumps.
1400 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1401 Enable CFI tables via GAS assembler directives.
1404 Common Report Var(flag_early_inlining) Init(1) Optimization
1405 Perform early inlining.
1407 feliminate-dwarf2-dups
1409 Does nothing. Preserved for backward compatibility.
1412 Common Report Var(flag_ipa_sra) Init(0) Optimization
1413 Perform interprocedural reduction of aggregates.
1415 feliminate-unused-debug-symbols
1416 Common Report Var(flag_debug_only_used_symbols) Init(1)
1417 Perform unused symbol elimination in debug info.
1419 feliminate-unused-debug-types
1420 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1421 Perform unused type elimination in debug info.
1423 femit-class-debug-always
1424 Common Report Var(flag_emit_class_debug_always) Init(0)
1425 Do not suppress C++ class debug information.
1428 Common Report Var(flag_exceptions) Optimization
1429 Enable exception handling.
1431 fexpensive-optimizations
1432 Common Report Var(flag_expensive_optimizations) Optimization
1433 Perform a number of minor, expensive optimizations.
1436 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision) Init(EXCESS_PRECISION_DEFAULT) Optimization SetByCombined
1437 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision.
1440 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1443 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1446 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1448 ; Whether we permit the extended set of values for FLT_EVAL_METHOD
1449 ; introduced in ISO/IEC TS 18661-3, or limit ourselves to those in C99/C11.
1450 fpermitted-flt-eval-methods=
1451 Common Joined RejectNegative Enum(permitted_flt_eval_methods) Var(flag_permitted_flt_eval_methods) Init(PERMITTED_FLT_EVAL_METHODS_DEFAULT)
1452 -fpermitted-flt-eval-methods=[c11|ts-18661] Specify which values of FLT_EVAL_METHOD are permitted.
1455 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)
1458 Enum(permitted_flt_eval_methods) String(c11) Value(PERMITTED_FLT_EVAL_METHODS_C11)
1461 Enum(permitted_flt_eval_methods) String(ts-18661-3) Value(PERMITTED_FLT_EVAL_METHODS_TS_18661)
1467 Common Var(flag_fat_lto_objects)
1468 Output lto objects containing both the intermediate language and binary output.
1471 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1472 Assume no NaNs or infinities are generated.
1475 Common Report Var(flag_finite_loops) Optimization
1476 Assume that loops with an exit will terminate and not loop indefinitely.
1479 Common Joined RejectNegative Var(common_deferred_options) Defer
1480 -ffixed-<register> Mark <register> as being unavailable to the compiler.
1483 Common Report Var(flag_float_store) Optimization
1484 Don't allocate floats and doubles in extended-precision registers.
1488 Does nothing. Preserved for backward compatibility.
1491 Common Report Var(flag_forward_propagate) Optimization
1492 Perform a forward propagation pass on RTL.
1495 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST) Optimization
1496 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1499 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1502 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1504 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1506 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1509 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1511 ffp-int-builtin-inexact
1512 Common Report Var(flag_fp_int_builtin_inexact) Init(1) Optimization
1513 Allow built-in functions ceil, floor, round, trunc to raise \"inexact\" exceptions.
1515 ; Nonzero means don't put addresses of constant functions in registers.
1516 ; Used for compiling the Unix kernel, where strange substitutions are
1517 ; done on the assembly output.
1519 Common Report Var(flag_no_function_cse,0) Optimization
1520 Allow function addresses to be held in registers.
1523 Common Report Var(flag_function_sections)
1524 Place each function into its own section.
1527 Common Report Var(flag_gcse) Optimization
1528 Perform global common subexpression elimination.
1531 Common Report Var(flag_gcse_lm) Init(1) Optimization
1532 Perform enhanced load motion during global common subexpression elimination.
1535 Common Report Var(flag_gcse_sm) Init(0) Optimization
1536 Perform store motion after global common subexpression elimination.
1539 Common Report Var(flag_gcse_las) Init(0) Optimization
1540 Perform redundant load after store elimination in global common subexpression
1544 Common Report Var(flag_gcse_after_reload) Optimization
1545 Perform global common subexpression elimination after register allocation has
1549 Name(dwarf_gnat_encodings) Type(int)
1552 Enum(dwarf_gnat_encodings) String(all) Value(DWARF_GNAT_ENCODINGS_ALL)
1555 Enum(dwarf_gnat_encodings) String(gdb) Value(DWARF_GNAT_ENCODINGS_GDB)
1558 Enum(dwarf_gnat_encodings) String(minimal) Value(DWARF_GNAT_ENCODINGS_MINIMAL)
1561 Common Enum(dwarf_gnat_encodings) Joined RejectNegative Report Undocumented Var(gnat_encodings)
1562 -fgnat-encodings=[all|gdb|minimal] Select the balance between GNAT encodings and standard DWARF emitted in the debug information.
1564 ; This option is not documented yet as its semantics will change.
1566 Common Report Var(flag_graphite) Optimization
1567 Enable in and out of Graphite representation.
1570 Common Report Var(flag_graphite_identity) Optimization
1571 Enable Graphite Identity transformation.
1573 fhoist-adjacent-loads
1574 Common Report Var(flag_hoist_adjacent_loads) Optimization
1575 Enable hoisting adjacent loads to encourage generating conditional move
1579 Common Undocumented Report Var(flag_keep_gc_roots_live) Optimization
1580 ; Always keep a pointer to a live memory block
1582 floop-parallelize-all
1583 Common Report Var(flag_loop_parallelize_all) Optimization
1584 Mark all loops as parallel.
1587 Common Alias(floop-nest-optimize)
1588 Enable loop nest transforms. Same as -floop-nest-optimize.
1591 Common Report Var(flag_loop_interchange) Optimization
1592 Enable loop interchange on trees.
1595 Common Alias(floop-nest-optimize)
1596 Enable loop nest transforms. Same as -floop-nest-optimize.
1598 floop-unroll-and-jam
1599 Common Report Var(flag_unroll_jam) Optimization
1600 Perform unroll-and-jam on loops.
1603 Common Report Var(flag_tm)
1604 Enable support for GNU transactional memory.
1607 Common Report Var(flag_gnu_unique) Init(1)
1608 Use STB_GNU_UNIQUE if supported by the assembler.
1612 Does nothing. Preserved for backward compatibility.
1615 Common Report Var(flag_loop_nest_optimize) Optimization
1616 Enable the loop nest optimizer.
1618 fstrict-volatile-bitfields
1619 Common Report Var(flag_strict_volatile_bitfields) Init(-1) Optimization
1620 Force bitfield accesses to match their type width.
1623 Common Report Var(flag_store_merging) Optimization
1624 Merge adjacent stores.
1626 fguess-branch-probability
1627 Common Report Var(flag_guess_branch_prob) Optimization
1628 Enable guessing of branch probabilities.
1630 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1631 ; Generate position-independent code for executables if possible
1632 ; On SVR4 targets, it also controls whether or not to emit a
1633 ; string identifying the compiler.
1635 Common Report Var(flag_no_ident,0)
1636 Process #ident directives.
1639 Common Report Var(flag_if_conversion) Optimization
1640 Perform conversion of conditional jumps to branchless equivalents.
1643 Common Report Var(flag_if_conversion2) Optimization
1644 Perform conversion of conditional jumps to conditional execution.
1647 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL) Optimization
1648 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1651 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1654 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1657 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1660 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1662 ftree-loop-if-convert
1663 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1664 Convert conditional jumps in innermost loops to branchless equivalents.
1666 ftree-loop-if-convert-stores
1668 Does nothing. Preserved for backward compatibility.
1670 ; -finhibit-size-directive inhibits output of .size for ELF.
1671 ; This is used only for compiling crtstuff.c,
1672 ; and it may be extended to other effects
1673 ; needed for crtstuff.c on other systems.
1674 finhibit-size-directive
1675 Common Report Var(flag_inhibit_size_directive)
1676 Do not generate .size directives.
1679 Common Report Var(flag_indirect_inlining) Optimization
1680 Perform indirect inlining.
1682 ; General flag to enable inlining. Specifying -fno-inline will disable
1683 ; all inlining apart from always-inline functions.
1685 Common Report Var(flag_no_inline,0) Init(0) Optimization
1686 Enable inlining of function declared \"inline\", disabling disables all inlining.
1688 finline-small-functions
1689 Common Report Var(flag_inline_small_functions) Optimization
1690 Integrate functions into their callers when code size is known not to grow.
1693 Common Report Var(flag_inline_functions) Optimization
1694 Integrate functions not declared \"inline\" into their callers when profitable.
1696 finline-functions-called-once
1697 Common Report Var(flag_inline_functions_called_once) Optimization
1698 Integrate functions only required by their single caller.
1701 Common RejectNegative Joined Alias(finline-limit=)
1704 Common RejectNegative Joined UInteger
1705 -finline-limit=<number> Limit the size of inlined functions to <number>.
1708 Common Report Var(flag_inline_atomics) Init(1) Optimization
1709 Inline __atomic operations when a lock free instruction sequence is available.
1712 Common RejectNegative Alias(fcf-protection=,full)
1715 Common Report Joined RejectNegative Enum(cf_protection_level) Var(flag_cf_protection) Init(CF_NONE)
1716 -fcf-protection=[full|branch|return|none] Instrument functions with checks to verify jump/call/return control-flow transfer
1717 instructions have valid targets.
1720 Name(cf_protection_level) Type(enum cf_protection_level) UnknownError(unknown Control-Flow Protection Level %qs)
1723 Enum(cf_protection_level) String(full) Value(CF_FULL)
1726 Enum(cf_protection_level) String(branch) Value(CF_BRANCH)
1729 Enum(cf_protection_level) String(return) Value(CF_RETURN)
1732 Enum(cf_protection_level) String(none) Value(CF_NONE)
1734 finstrument-functions
1735 Common Report Var(flag_instrument_function_entry_exit)
1736 Instrument function entry and exit with profiling calls.
1738 finstrument-functions-exclude-function-list=
1739 Common RejectNegative Joined
1740 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions.
1742 finstrument-functions-exclude-file-list=
1743 Common RejectNegative Joined
1744 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files.
1747 Common Report Var(flag_ipa_cp) Optimization
1748 Perform interprocedural constant propagation.
1751 Common Report Var(flag_ipa_cp_clone) Optimization
1752 Perform cloning to make Interprocedural constant propagation stronger.
1756 Does nothing. Preserved for backward compatibility.
1759 Common Report Var(flag_ipa_bit_cp) Optimization
1760 Perform interprocedural bitwise constant propagation.
1763 Common Report Var(flag_ipa_profile) Init(0) Optimization
1764 Perform interprocedural profile propagation.
1767 Common Report Var(flag_ipa_pta) Init(0) Optimization
1768 Perform interprocedural points-to analysis.
1771 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1772 Discover pure and const functions.
1775 Common Report Var(flag_ipa_icf) Optimization
1776 Perform Identical Code Folding for functions and read-only variables.
1779 Common Report Var(flag_ipa_icf_functions) Optimization
1780 Perform Identical Code Folding for functions.
1783 Common Report Var(flag_ipa_icf_variables) Optimization
1784 Perform Identical Code Folding for variables.
1787 Common Report Var(flag_ipa_reference) Init(0) Optimization
1788 Discover read-only and non addressable static variables.
1790 fipa-reference-addressable
1791 Common Report Var(flag_ipa_reference_addressable) Init(0) Optimization
1792 Discover read-only, write-only and non-addressable static variables.
1794 fipa-stack-alignment
1795 Common Report Var(flag_ipa_stack_alignment) Init(1) Optimization
1796 Reduce stack alignment on call sites if possible.
1800 Does nothing. Preserved for backward compatibility.
1804 Does nothing. Preserved for backward compatibility.
1807 Common Report Var(flag_ipa_vrp) Optimization
1808 Perform IPA Value Range Propagation.
1811 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB) Optimization
1812 -fira-algorithm=[CB|priority] Set the used IRA algorithm.
1815 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1818 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1821 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1824 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT) Optimization
1825 -fira-region=[one|all|mixed] Set regions for IRA.
1828 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1831 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1834 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1837 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1840 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1841 Use IRA based register pressure calculation
1842 in RTL hoist optimizations.
1845 Common Report Var(flag_ira_loop_pressure) Optimization
1846 Use IRA based register pressure calculation
1847 in RTL loop optimizations.
1849 fira-share-save-slots
1850 Common Report Var(flag_ira_share_save_slots) Init(1) Optimization
1851 Share slots for saving different hard registers.
1853 fira-share-spill-slots
1854 Common Report Var(flag_ira_share_spill_slots) Init(1) Optimization
1855 Share stack slots for spilled pseudo-registers.
1858 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1859 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1862 Common Report Var(flag_ivopts) Init(1) Optimization
1863 Optimize induction variables on trees.
1866 Common Var(flag_jump_tables) Init(1) Optimization
1867 Use jump tables for sufficiently large switch statements.
1869 fkeep-inline-functions
1870 Common Report Var(flag_keep_inline_functions)
1871 Generate code for functions even if they are fully inlined.
1873 fkeep-static-functions
1874 Common Report Var(flag_keep_static_functions)
1875 Generate code for static functions even if they are never called.
1878 Common Report Var(flag_keep_static_consts) Init(1)
1879 Emit static const variables even if they are not used.
1882 Common Report Var(flag_leading_underscore) Init(-1)
1883 Give external symbols a leading underscore.
1887 Does nothing. Preserved for backward compatibility.
1890 Common Report Var(flag_lra_remat) Optimization
1891 Do CFG-sensitive rematerialization in LRA.
1895 Enable link-time optimization.
1898 Common RejectNegative Joined Var(flag_lto)
1899 Link-time optimization with number of parallel jobs or jobserver.
1902 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1905 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1908 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1911 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1914 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1917 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1920 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1921 Specify the algorithm to partition symbols and vars at linktime.
1923 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1924 flto-compression-level=
1925 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1) IntegerRange(0, 19)
1926 -flto-compression-level=<number> Use zlib/zstd compression level <number> for IL.
1928 flto-odr-type-merging
1930 Does nothing. Preserved for backward compatibility.
1933 Common Report Var(flag_lto_report) Init(0)
1934 Report various link-time optimization statistics.
1937 Common Report Var(flag_lto_report_wpa) Init(0)
1938 Report various link-time optimization statistics for WPA only.
1941 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1942 Set errno after built-in math functions.
1945 Common Joined RejectNegative UInteger Var(flag_max_errors)
1946 -fmax-errors=<number> Maximum number of errors to report.
1949 Common Report Var(mem_report)
1950 Report on permanent memory allocation.
1953 Common Report Var(mem_report_wpa)
1954 Report on permanent memory allocation in WPA only.
1956 ; This will attempt to merge constant section constants, if 1 only
1957 ; string constants and constants from constant pool, if 2 also constant
1959 fmerge-all-constants
1960 Common Report Var(flag_merge_constants,2) Init(1)
1961 Attempt to merge identical constants and constant variables.
1964 Common Report Var(flag_merge_constants,1)
1965 Attempt to merge identical constants across compilation units.
1967 fmerge-debug-strings
1968 Common Report Var(flag_merge_debug_strings) Init(1)
1969 Attempt to merge identical debug strings across compilation units.
1972 Common RejectNegative Joined UInteger
1973 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping.
1976 Common Report Var(flag_modulo_sched) Optimization
1977 Perform SMS based modulo scheduling before the first scheduling pass.
1979 fmodulo-sched-allow-regmoves
1980 Common Report Var(flag_modulo_sched_allow_regmoves) Optimization
1981 Perform SMS based modulo scheduling with register moves allowed.
1983 fmove-loop-invariants
1984 Common Report Var(flag_move_loop_invariants) Optimization
1985 Move loop invariant computations out of loops.
1988 Common Var(flag_dce) Init(1) Optimization
1989 Use the RTL dead code elimination pass.
1992 Common Var(flag_dse) Init(0) Optimization
1993 Use the RTL dead store elimination pass.
1995 freschedule-modulo-scheduled-loops
1996 Common Report Var(flag_resched_modulo_sched) Optimization
1997 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling.
1999 fnon-call-exceptions
2000 Common Report Var(flag_non_call_exceptions) Optimization
2001 Support synchronous non-call exceptions.
2004 Common Driver Joined MissingArgError(options or targets missing after %qs)
2005 -foffload=<targets>=<options> Specify offloading targets and options for them.
2008 Common Joined RejectNegative Enum(offload_abi) Var(flag_offload_abi) Init(OFFLOAD_ABI_UNSET)
2009 -foffload-abi=[lp64|ilp32] Set the ABI to use in an offload compiler.
2012 Name(offload_abi) Type(enum offload_abi) UnknownError(unknown offload ABI %qs)
2015 Enum(offload_abi) String(ilp32) Value(OFFLOAD_ABI_ILP32)
2018 Enum(offload_abi) String(lp64) Value(OFFLOAD_ABI_LP64)
2021 Common Report Var(flag_omit_frame_pointer) Optimization
2022 When possible do not generate stack frames.
2025 Common Report Var(flag_opt_info) Optimization
2026 Enable all optimization info dumps on stderr.
2029 Common Joined RejectNegative Var(common_deferred_options) Defer
2030 -fopt-info[-<type>=filename] Dump compiler optimization details.
2032 fsave-optimization-record
2033 Common Report Var(flag_save_optimization_record) Optimization
2034 Write a SRCFILE.opt-record.json file detailing what optimizations were performed.
2036 foptimize-register-move
2038 Does nothing. Preserved for backward compatibility.
2040 foptimize-sibling-calls
2041 Common Report Var(flag_optimize_sibling_calls) Optimization
2042 Optimize sibling and tail recursive calls.
2045 Common Report Var(flag_partial_inlining) Optimization
2046 Perform partial inlining.
2049 Common Report Var(pre_ipa_mem_report)
2050 Report on memory allocation before interprocedural optimization.
2052 fpost-ipa-mem-report
2053 Common Report Var(post_ipa_mem_report)
2054 Report on memory allocation before interprocedural optimization.
2057 Common Report Var(flag_pack_struct) Optimization
2058 Pack structure members together without holes.
2061 Common RejectNegative Joined UInteger Optimization
2062 -fpack-struct=<number> Set initial maximum structure member alignment.
2065 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
2066 Return small aggregates in memory, not registers.
2069 Common Report Var(flag_peel_loops) Optimization
2070 Perform loop peeling.
2073 Common Report Var(flag_no_peephole,0) Optimization
2074 Enable machine specific peephole optimizations.
2077 Common Report Var(flag_peephole2) Optimization
2078 Enable an RTL peephole pass before sched2.
2081 Common Report Var(flag_pic,2) Negative(fPIE) Init(-1)
2082 Generate position-independent code if possible (large mode).
2085 Common Report Var(flag_pie,2) Negative(fpic) Init(-1)
2086 Generate position-independent code for executables if possible (large mode).
2089 Common Report Var(flag_pic,1) Negative(fpie) Init(-1)
2090 Generate position-independent code if possible (small mode).
2093 Common Report Var(flag_pie,1) Negative(fPIC) Init(-1)
2094 Generate position-independent code for executables if possible (small mode).
2097 Common Report Var(flag_plt) Init(1) Optimization
2098 Use PLT for PIC calls (-fno-plt: load the address from GOT at call site).
2101 Common Joined RejectNegative Var(common_deferred_options) Defer
2102 Specify a plugin to load.
2105 Common Joined RejectNegative Var(common_deferred_options) Defer
2106 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>.
2108 fpredictive-commoning
2109 Common Report Var(flag_predictive_commoning) Optimization
2110 Run predictive commoning optimization.
2112 fprefetch-loop-arrays
2113 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
2114 Generate prefetch instructions, if available, for arrays in loops.
2117 Common Report Var(profile_flag)
2118 Enable basic program profiling code.
2121 Common Report Var(profile_abs_path_flag)
2122 Generate absolute source path names for gcov.
2125 Common Report Var(profile_arc_flag)
2126 Insert arc-based program profiling code.
2129 Common Joined RejectNegative Var(profile_data_prefix)
2130 Set the top-level directory for storing the profile data.
2131 The default is 'pwd'.
2134 Common Joined RejectNegative Var(profile_note_location)
2135 Select the name for storing the profile note file.
2138 Common Report Var(flag_profile_correction)
2139 Enable correction of flow inconsistent profile data input.
2142 Common Joined RejectNegative Enum(profile_update) Var(flag_profile_update) Init(PROFILE_UPDATE_SINGLE)
2143 -fprofile-update=[single|atomic|prefer-atomic] Set the profile update method.
2145 fprofile-filter-files=
2146 Common Joined RejectNegative Var(flag_profile_filter_files)
2147 Instrument only functions from files where names match any regular expression (separated by a semi-colon).
2149 fprofile-exclude-files=
2150 Common Joined RejectNegative Var(flag_profile_exclude_files)
2151 Instrument only functions from files where names do not match all the regular expressions (separated by a semi-colon).
2154 Name(profile_update) Type(enum profile_update) UnknownError(unknown profile update method %qs)
2157 Enum(profile_update) String(single) Value(PROFILE_UPDATE_SINGLE)
2160 Enum(profile_update) String(atomic) Value(PROFILE_UPDATE_ATOMIC)
2163 Enum(profile_update) String(prefer-atomic) Value(PROFILE_UPDATE_PREFER_ATOMIC)
2167 Enable common options for generating profile info for profile feedback directed optimizations.
2170 Common Joined RejectNegative
2171 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=.
2174 Common Var(flag_profile_use)
2175 Enable common options for performing profile feedback directed optimizations.
2178 Common Joined RejectNegative
2179 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=.
2182 Common Report Var(flag_profile_values)
2183 Insert code to profile values of expressions.
2186 Common Report Var(profile_report)
2187 Report on consistency of profile.
2189 fprofile-reorder-functions
2190 Common Report Var(flag_profile_reorder_functions)
2191 Enable function reordering that improves code placement.
2193 fpatchable-function-entry=
2194 Common Joined Optimization
2195 Insert NOP instructions at each function entry.
2198 Common Var(common_deferred_options) Defer
2201 Common Joined RejectNegative Var(common_deferred_options) Defer
2202 -frandom-seed=<string> Make compile reproducible using <string>.
2204 ; This switch causes the command line that was used to create an
2205 ; object file to be recorded into the object file. The exact format
2206 ; of this recording is target and binary file format dependent.
2207 ; It is related to the -fverbose-asm switch, but that switch only
2208 ; records information in the assembler output file as comments, so
2209 ; they never reach the object file.
2210 frecord-gcc-switches
2211 Common Report Var(flag_record_gcc_switches)
2212 Record gcc command line switches in the object file.
2215 Common Report Var(flag_pcc_struct_return,0) Optimization
2216 Return small aggregates in registers.
2220 Does nothing. Preserved for backward compatibility.
2223 Common Report Var(flag_lifetime_dse,2) Init(2) Optimization
2224 Tell DSE that the storage for a C++ object is dead when the constructor
2225 starts and when the destructor finishes.
2228 Common Joined RejectNegative UInteger Var(flag_lifetime_dse) Optimization IntegerRange(0, 2)
2231 Common RejectNegative Alias(flive-patching=,inline-clone) Optimization
2234 Common Report Joined RejectNegative Enum(live_patching_level) Var(flag_live_patching) Init(LIVE_PATCHING_NONE) Optimization
2235 -flive-patching=[inline-only-static|inline-clone] Control IPA
2236 optimizations to provide a safe compilation for live-patching. At the same
2237 time, provides multiple-level control on the enabled IPA optimizations.
2240 Name(live_patching_level) Type(enum live_patching_level) UnknownError(unknown Live-Patching Level %qs)
2243 Enum(live_patching_level) String(inline-only-static) Value(LIVE_PATCHING_INLINE_ONLY_STATIC)
2246 Enum(live_patching_level) String(inline-clone) Value(LIVE_PATCHING_INLINE_CLONE)
2249 Common Report Var(flag_allocation_dce) Init(1) Optimization
2250 Tell DCE to remove unused C++ allocations.
2252 flive-range-shrinkage
2253 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
2254 Relief of register pressure through live range shrinkage.
2257 Common Report Var(flag_rename_registers) Init(2) Optimization
2258 Perform a register renaming optimization pass.
2261 Common Report Var(flag_schedule_fusion) Init(2) Optimization
2262 Perform a target dependent instruction fusion optimization pass.
2265 Common Report Var(flag_reorder_blocks) Optimization
2266 Reorder basic blocks to improve code placement.
2268 freorder-blocks-algorithm=
2269 Common Joined RejectNegative Enum(reorder_blocks_algorithm) Var(flag_reorder_blocks_algorithm) Init(REORDER_BLOCKS_ALGORITHM_SIMPLE) Optimization
2270 -freorder-blocks-algorithm=[simple|stc] Set the used basic block reordering algorithm.
2273 Name(reorder_blocks_algorithm) Type(enum reorder_blocks_algorithm) UnknownError(unknown basic block reordering algorithm %qs)
2276 Enum(reorder_blocks_algorithm) String(simple) Value(REORDER_BLOCKS_ALGORITHM_SIMPLE)
2279 Enum(reorder_blocks_algorithm) String(stc) Value(REORDER_BLOCKS_ALGORITHM_STC)
2281 freorder-blocks-and-partition
2282 Common Report Var(flag_reorder_blocks_and_partition) Optimization
2283 Reorder basic blocks and partition into hot and cold sections.
2286 Common Report Var(flag_reorder_functions) Optimization
2287 Reorder functions to improve code placement.
2289 frerun-cse-after-loop
2290 Common Report Var(flag_rerun_cse_after_loop) Optimization
2291 Add a common subexpression elimination pass after loop optimizations.
2295 Does nothing. Preserved for backward compatibility.
2298 Common Report Var(flag_rounding_math) Optimization SetByCombined
2299 Disable optimizations that assume default FP rounding behavior.
2302 Common Report Var(flag_schedule_interblock) Init(1) Optimization
2303 Enable scheduling across basic blocks.
2306 Common Report Var(flag_sched_pressure) Init(0) Optimization
2307 Enable register pressure sensitive insn scheduling.
2310 Common Report Var(flag_schedule_speculative) Init(1) Optimization
2311 Allow speculative motion of non-loads.
2314 Common Report Var(flag_schedule_speculative_load) Optimization
2315 Allow speculative motion of some loads.
2317 fsched-spec-load-dangerous
2318 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
2319 Allow speculative motion of more loads.
2322 Common RejectNegative Joined UInteger Var(sched_verbose_param) Init(1)
2323 -fsched-verbose=<number> Set the verbosity level of the scheduler.
2325 fsched2-use-superblocks
2326 Common Report Var(flag_sched2_use_superblocks) Optimization
2327 If scheduling post reload, do superblock scheduling.
2331 Does nothing. Preserved for backward compatibility.
2334 Common Report Var(flag_schedule_insns) Optimization
2335 Reschedule instructions before register allocation.
2338 Common Report Var(flag_schedule_insns_after_reload) Optimization
2339 Reschedule instructions after register allocation.
2341 ; This flag should be on when a target implements non-trivial
2342 ; scheduling hooks, maybe saving some information for its own sake.
2343 ; On IA64, for example, this is used for correct bundling.
2344 fselective-scheduling
2345 Common Report Var(flag_selective_scheduling) Optimization
2346 Schedule instructions using selective scheduling algorithm.
2348 fselective-scheduling2
2349 Common Report Var(flag_selective_scheduling2) Optimization
2350 Run selective scheduling after reload.
2353 Common Undocumented Joined Var(flag_self_test)
2354 Run self-tests, using the given path to locate test files.
2356 fsel-sched-pipelining
2357 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
2358 Perform software pipelining of inner loops during selective scheduling.
2360 fsel-sched-pipelining-outer-loops
2361 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
2362 Perform software pipelining of outer loops during selective scheduling.
2364 fsel-sched-reschedule-pipelined
2365 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
2366 Reschedule pipelined regions without pipelining.
2368 fsemantic-interposition
2369 Common Report Var(flag_semantic_interposition) Init(1)
2370 Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker.
2372 ; sched_stalled_insns means that insns can be moved prematurely from the queue
2373 ; of stalled insns into the ready list.
2374 fsched-stalled-insns
2375 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
2376 Allow premature scheduling of queued insns.
2378 fsched-stalled-insns=
2379 Common RejectNegative Joined UInteger Optimization
2380 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled.
2382 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
2383 ; be examined for a dependency on a stalled insn that is candidate for
2384 ; premature removal from the queue of stalled insns into the ready list (has
2385 ; an effect only if the flag 'sched_stalled_insns' is set).
2386 fsched-stalled-insns-dep
2387 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
2388 Set dependence distance checking in premature scheduling of queued insns.
2390 fsched-stalled-insns-dep=
2391 Common RejectNegative Joined UInteger Optimization
2392 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns.
2394 fsched-group-heuristic
2395 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
2396 Enable the group heuristic in the scheduler.
2398 fsched-critical-path-heuristic
2399 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
2400 Enable the critical path heuristic in the scheduler.
2402 fsched-spec-insn-heuristic
2403 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
2404 Enable the speculative instruction heuristic in the scheduler.
2406 fsched-rank-heuristic
2407 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
2408 Enable the rank heuristic in the scheduler.
2410 fsched-last-insn-heuristic
2411 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
2412 Enable the last instruction heuristic in the scheduler.
2414 fsched-dep-count-heuristic
2415 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
2416 Enable the dependent count heuristic in the scheduler.
2419 Common Report Var(flag_section_anchors) Optimization
2420 Access data in the same section from shared anchor points.
2424 Does nothing. Preserved for backward compatibility.
2428 Does nothing. Preserved for backward compatibility.
2431 Common Report Var(flag_ree) Init(0)
2432 Turn on Redundant Extensions Elimination pass.
2435 Common Report Var(flag_show_column) Init(1)
2436 Show column numbers in diagnostics, when available. Default on.
2439 Common Report Var(flag_shrink_wrap) Optimization
2440 Emit function prologues only before parts of the function that need it,
2441 rather than at the top of the function.
2443 fshrink-wrap-separate
2444 Common Report Var(flag_shrink_wrap_separate) Init(1) Optimization
2445 Shrink-wrap parts of the prologue and epilogue separately.
2448 Common Report Var(flag_signaling_nans) Optimization SetByCombined
2449 Disable optimizations observable by IEEE signaling NaNs.
2452 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
2453 Disable floating point optimizations that ignore the IEEE signedness of zero.
2455 fsingle-precision-constant
2456 Common Report Var(flag_single_precision_constant) Optimization
2457 Convert floating point constants to single precision constants.
2459 fsplit-ivs-in-unroller
2460 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
2461 Split lifetimes of induction variables when loops are unrolled.
2464 Common Report Var(flag_split_stack) Init(-1)
2465 Generate discontiguous stack frames.
2468 Common Report Var(flag_split_wide_types) Optimization
2469 Split wide types into independent registers.
2471 fsplit-wide-types-early
2472 Common Report Var(flag_split_wide_types_early) Optimization
2473 Split wide types into independent registers earlier.
2476 Common Report Var(flag_ssa_backprop) Init(1) Optimization
2477 Enable backward propagation of use properties at the SSA level.
2480 Common Report Var(flag_ssa_phiopt) Optimization
2481 Optimize conditional patterns using SSA PHI nodes.
2484 Common Report Var(flag_stdarg_opt) Init(1) Optimization
2485 Optimize amount of stdarg registers saved to stack at start of function.
2487 fvariable-expansion-in-unroller
2488 Common Report Var(flag_variable_expansion_in_unroller) Optimization
2489 Apply variable expansion when loops are unrolled.
2492 Common Report RejectNegative Joined Optimization
2493 -fstack-check=[no|generic|specific] Insert stack checking code into the program.
2496 Common Alias(fstack-check=, specific, no)
2497 Insert stack checking code into the program. Same as -fstack-check=specific.
2499 fstack-clash-protection
2500 Common Report Var(flag_stack_clash_protection) Optimization
2501 Insert code to probe each page of stack space as it is allocated to protect
2502 from stack-clash style attacks.
2505 Common Var(common_deferred_options) Defer
2507 fstack-limit-register=
2508 Common RejectNegative Joined Var(common_deferred_options) Defer
2509 -fstack-limit-register=<register> Trap if the stack goes past <register>.
2511 fstack-limit-symbol=
2512 Common RejectNegative Joined Var(common_deferred_options) Defer
2513 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>.
2516 Common Report Var(flag_stack_protect, 1) Init(-1) Optimization
2517 Use propolice as a stack protection method.
2519 fstack-protector-all
2520 Common Report RejectNegative Var(flag_stack_protect, 2) Init(-1) Optimization
2521 Use a stack protection method for every function.
2523 fstack-protector-strong
2524 Common Report RejectNegative Var(flag_stack_protect, 3) Init(-1) Optimization
2525 Use a smart stack protection method for certain functions.
2527 fstack-protector-explicit
2528 Common Report RejectNegative Var(flag_stack_protect, 4) Optimization
2529 Use stack protection method only for functions with the stack_protect attribute.
2532 Common RejectNegative Var(flag_stack_usage)
2533 Output stack usage information on a per-function basis.
2537 Does nothing. Preserved for backward compatibility.
2539 ; Nonzero if we should do (language-dependent) alias analysis.
2540 ; Typically, this analysis will assume that expressions of certain
2541 ; types do not alias expressions of certain other types. Only used
2542 ; if alias analysis (in general) is enabled.
2544 Common Report Var(flag_strict_aliasing) Optimization
2545 Assume strict aliasing rules apply.
2549 Treat signed overflow as undefined. Negated as -fwrapv -fwrapv-pointer.
2552 Common Report Var(flag_sync_libcalls) Init(1)
2553 Implement __atomic operations via libcalls to legacy __sync functions.
2556 Common Report Var(flag_syntax_only)
2557 Check for syntax errors, then stop.
2560 Common Report Var(flag_test_coverage)
2561 Create data files needed by \"gcov\".
2564 Common Report Var(flag_thread_jumps) Optimization
2565 Perform jump threading optimizations.
2568 Common Report Var(time_report)
2569 Report the time taken by each compiler pass.
2571 ftime-report-details
2572 Common Report Var(time_report_details)
2573 Record times taken by sub-phases separately.
2576 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2577 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model.
2580 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2583 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2586 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2589 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2592 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2595 Common Report Var(flag_toplevel_reorder) Init(2)
2596 Reorder top level functions, variables, and asms.
2599 Common Report Var(flag_tracer) Optimization
2600 Perform superblock formation via tail duplication.
2603 Common Report Var(flag_trampolines) Init(0)
2604 For targets that normally need trampolines for nested functions, always
2605 generate them instead of using descriptors.
2607 ; Zero means that floating-point math operations cannot generate a
2608 ; (user-visible) trap. This is the case, for example, in nonstop
2609 ; IEEE 754 arithmetic.
2611 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2612 Assume floating-point operations can trap.
2615 Common Report Var(flag_trapv) Optimization
2616 Trap for signed overflow in addition, subtraction and multiplication.
2619 Common Report Var(flag_tree_ccp) Optimization
2620 Enable SSA-CCP optimization on trees.
2623 Common Report Var(flag_tree_bit_ccp) Optimization
2624 Enable SSA-BIT-CCP optimization on trees.
2628 Does nothing. Preserved for backward compatibility.
2631 Common Report Var(flag_tree_ch) Optimization
2632 Enable loop header copying on trees.
2634 ftree-coalesce-inlined-vars
2635 Common Ignore RejectNegative
2636 Does nothing. Preserved for backward compatibility.
2639 Common Report Var(flag_tree_coalesce_vars) Optimization
2640 Enable SSA coalescing of user variables.
2644 Does nothing. Preserved for backward compatibility.
2647 Common Report Var(flag_tree_copy_prop) Optimization
2648 Enable copy propagation on trees.
2650 ftree-store-copy-prop
2652 Does nothing. Preserved for backward compatibility.
2655 Common Report Var(flag_tree_cselim) Init(2) Optimization
2656 Transform condition stores into unconditional ones.
2658 ftree-switch-conversion
2659 Common Report Var(flag_tree_switch_conversion) Optimization
2660 Perform conversions of switch initializations.
2663 Common Report Var(flag_tree_dce) Optimization
2664 Enable SSA dead code elimination optimization on trees.
2666 ftree-dominator-opts
2667 Common Report Var(flag_tree_dom) Optimization
2668 Enable dominator optimizations.
2671 Common Report Var(flag_tree_tail_merge) Optimization
2672 Enable tail merging on trees.
2675 Common Report Var(flag_tree_dse) Optimization
2676 Enable dead store elimination.
2679 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2680 Enable forward propagation on trees.
2683 Common Report Var(flag_tree_fre) Optimization
2684 Enable Full Redundancy Elimination (FRE) on trees.
2687 Common Report Var(flag_optimize_strlen) Optimization
2688 Enable string length optimizations on trees.
2690 fisolate-erroneous-paths-dereference
2691 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2692 Detect paths that trigger erroneous or undefined behavior due to
2693 dereferencing a null pointer. Isolate those paths from the main control
2694 flow and turn the statement with erroneous or undefined behavior into a trap.
2696 fisolate-erroneous-paths-attribute
2697 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2698 Detect paths that trigger erroneous or undefined behavior due to a null value
2699 being used in a way forbidden by a returns_nonnull or nonnull
2700 attribute. Isolate those paths from the main control flow and turn the
2701 statement with erroneous or undefined behavior into a trap.
2703 ftree-loop-distribution
2704 Common Report Var(flag_tree_loop_distribution) Optimization
2705 Enable loop distribution on trees.
2707 ftree-loop-distribute-patterns
2708 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2709 Enable loop distribution for patterns transformed into a library call.
2712 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2713 Enable loop invariant motion on trees.
2716 Common Alias(floop-nest-optimize)
2717 Enable loop nest transforms. Same as -floop-nest-optimize.
2720 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2721 Create canonical induction variables in loops.
2724 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2725 Enable loop optimizations on tree level.
2727 ftree-parallelize-loops=
2728 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1) Optimization
2729 -ftree-parallelize-loops=<number> Enable automatic parallelization of loops.
2732 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2733 Enable hoisting loads from conditional pointers.
2736 Common Report Var(flag_tree_pre) Optimization
2737 Enable SSA-PRE optimization on trees.
2740 Common Report Var(flag_tree_partial_pre) Optimization
2741 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination.
2744 Common Report Var(flag_tree_pta) Optimization
2745 Perform function-local points-to analysis on trees.
2748 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2749 Enable reassociation on tree level.
2753 Does nothing. Preserved for backward compatibility.
2756 Common Report Var(flag_tree_sink) Optimization
2757 Enable SSA code sinking on trees.
2760 Common Report Var(flag_tree_slsr) Optimization
2761 Perform straight-line strength reduction.
2764 Common Report Var(flag_tree_sra) Optimization
2765 Perform scalar replacement of aggregates.
2768 Common Report Var(flag_tree_ter) Optimization
2769 Replace temporary expressions in the SSA->normal pass.
2772 Common Report Var(flag_tree_live_range_split) Optimization
2773 Perform live range splitting during the SSA->normal pass.
2776 Common Report Var(flag_tree_vrp) Init(0) Optimization
2777 Perform Value Range Propagation on trees.
2780 Common Report Var(flag_split_paths) Init(0) Optimization
2781 Split paths leading to loop backedges.
2783 funconstrained-commons
2784 Common Var(flag_unconstrained_commons) Optimization
2785 Assume common declarations may be overridden with ones with a larger
2789 Common Report Var(flag_unit_at_a_time) Init(1)
2790 Compile whole compilation unit at a time.
2793 Common Report Var(flag_unroll_loops) Optimization
2794 Perform loop unrolling when iteration count is known.
2797 Common Report Var(flag_unroll_all_loops) Optimization
2798 Perform loop unrolling for all loops.
2800 ; Nonzero means that loop optimizer may assume that the induction variables
2801 ; that control loops do not overflow and that the loops with nontrivial
2802 ; exit condition are not infinite
2803 funsafe-loop-optimizations
2805 Does nothing. Preserved for backward compatibility.
2808 Common Report Var(flag_associative_math) SetByCombined Optimization
2809 Allow optimization for floating-point arithmetic which may change the
2810 result of the operation due to rounding.
2813 Common Report Var(flag_reciprocal_math) SetByCombined Optimization
2814 Same as -fassociative-math for expressions which include division.
2816 ; Nonzero means that unsafe floating-point math optimizations are allowed
2817 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2818 ; are allowed to assume that their arguments and results are "normal"
2819 ; (e.g., nonnegative for SQRT).
2820 funsafe-math-optimizations
2821 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2822 Allow math optimizations that may violate IEEE or ISO standards.
2825 Common Report Var(flag_unswitch_loops) Optimization
2826 Perform loop unswitching.
2829 Common Report Var(flag_split_loops) Optimization
2830 Perform loop splitting.
2832 fversion-loops-for-strides
2833 Common Report Var(flag_version_loops_for_strides) Optimization
2834 Version loops based on whether indices have a stride of one.
2837 Common Report Var(flag_unwind_tables) Optimization
2838 Just generate unwind tables for exception handling.
2841 Common Driver Negative(fuse-ld=gold)
2842 Use the bfd linker instead of the default linker.
2845 Common Driver Negative(fuse-ld=bfd)
2846 Use the gold linker instead of the default linker.
2849 Common Driver Negative(fuse-ld=lld)
2850 Use the lld LLVM linker instead of the default linker.
2853 Common Undocumented Var(flag_use_linker_plugin)
2855 ; Positive if we should track variables, negative if we should run
2856 ; the var-tracking pass only to discard debug annotations, zero if
2857 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2858 ; will be set according to optimize, debug_info_level and debug_hooks
2859 ; in process_options ().
2861 Common Report Var(flag_var_tracking) Init(2) PerFunction
2862 Perform variable tracking.
2864 ; Positive if we should track variables at assignments, negative if
2865 ; we should run the var-tracking pass only to discard debug
2866 ; annotations. When flag_var_tracking_assignments ==
2867 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2868 fvar-tracking-assignments
2869 Common Report Var(flag_var_tracking_assignments) Init(2) PerFunction
2870 Perform variable tracking by annotating assignments.
2872 ; Nonzero if we should toggle flag_var_tracking_assignments after
2873 ; processing options and computing its default. */
2874 fvar-tracking-assignments-toggle
2875 Common Report Var(flag_var_tracking_assignments_toggle) PerFunction
2876 Toggle -fvar-tracking-assignments.
2878 ; Positive if we should track uninitialized variables, negative if
2879 ; we should run the var-tracking pass only to discard debug
2880 ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
2881 ; will be set according to flag_var_tracking.
2882 fvar-tracking-uninit
2883 Common Report Var(flag_var_tracking_uninit) PerFunction
2884 Perform variable tracking and also tag variables that are uninitialized.
2886 ; Alias to enable both -ftree-loop-vectorize and -ftree-slp-vectorize.
2888 Common Report Optimization
2889 Enable vectorization on trees.
2891 ftree-vectorizer-verbose=
2892 Common Joined RejectNegative Ignore
2893 Does nothing. Preserved for backward compatibility.
2895 ftree-loop-vectorize
2896 Common Report Var(flag_tree_loop_vectorize) Optimization EnabledBy(ftree-vectorize)
2897 Enable loop vectorization on trees.
2900 Common Report Var(flag_tree_slp_vectorize) Optimization EnabledBy(ftree-vectorize)
2901 Enable basic block vectorization (SLP) on trees.
2904 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT) Optimization
2905 -fvect-cost-model=[unlimited|dynamic|cheap] Specifies the cost model for vectorization.
2908 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED) Optimization
2909 -fsimd-cost-model=[unlimited|dynamic|cheap] Specifies the vectorization cost model for code marked with a simd directive.
2912 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2915 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2918 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2921 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2924 Common Alias(fvect-cost-model=,dynamic,unlimited)
2925 Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
2927 ftree-vect-loop-version
2929 Does nothing. Preserved for backward compatibility.
2932 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2933 Enable copy propagation of scalar-evolution information.
2935 ; -fverbose-asm causes extra commentary information to be produced in
2936 ; the generated assembly code (to make it more readable). This option
2937 ; is generally only of use to those who actually need to read the
2938 ; generated assembly code (perhaps while debugging the compiler itself).
2939 ; -fno-verbose-asm, the default, causes the extra information
2940 ; to not be added and is useful when comparing two assembler files.
2942 Common Report Var(flag_verbose_asm)
2943 Add extra commentary to assembler output.
2946 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2947 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility.
2950 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2953 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2956 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2959 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2962 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2965 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2966 Validate vtable pointers before using them.
2969 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2972 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2975 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2978 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2981 Common Var(flag_vtv_counts)
2982 Output vtable verification counters.
2985 Common Var(flag_vtv_debug)
2986 Output vtable verification pointer sets information.
2989 Common Report Var(flag_value_profile_transformations) Optimization
2990 Use expression value profiles in optimizations.
2993 Common Report Var(flag_web) Init(2) Optimization
2994 Construct webs and split unrelated uses of single variable.
2996 ftree-builtin-call-dce
2997 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2998 Enable conditional dead code elimination for builtin calls.
3001 Common Report Var(flag_whole_program) Init(0)
3002 Perform whole program optimizations.
3005 Common Report Var(flag_wrapv_pointer) Optimization
3006 Assume pointer overflow wraps around.
3009 Common Report Var(flag_wrapv) Optimization
3010 Assume signed arithmetic overflow wraps around.
3012 fzero-initialized-in-bss
3013 Common Report Var(flag_zero_initialized_in_bss) Init(1)
3014 Put zero initialized data in the bss section.
3017 Common Driver RejectNegative JoinedOrMissing
3018 Generate debug information in default format.
3021 Common Driver Var(dwarf2out_as_loc_support) Init(2)
3022 Assume assembler support for (DWARF2+) .loc directives.
3025 Common Driver Var(dwarf2out_as_locview_support) Init(2)
3026 Assume assembler support for view in (DWARF2+) .loc directives.
3029 Common Driver WarnRemoved
3030 Does nothing. Preserved for backward compatibility.
3033 Common Driver WarnRemoved
3034 Does nothing. Preserved for backward compatibility.
3037 Common Driver WarnRemoved
3038 Does nothing. Preserved for backward compatibility.
3041 Common Driver WarnRemoved
3042 Does nothing. Preserved for backward compatibility.
3045 Common Driver Var(debug_column_info,1) Init(1)
3046 Record DW_AT_decl_column and DW_AT_call_column in DWARF.
3049 Common Driver JoinedOrMissing Negative(gdwarf-)
3050 Generate debug information in default version of DWARF format.
3053 Common Driver Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
3054 Generate debug information in DWARF v2 (or later) format.
3057 Common Driver JoinedOrMissing
3058 Generate debug information in default extended format.
3061 Common Driver Var(debug_inline_points) Init(2)
3062 Generate extended entry point information for inlined functions.
3064 ginternal-reset-location-views
3065 Common Driver Var(debug_internal_reset_location_views) Init(2)
3066 Compute locview reset points based on insn length estimates.
3069 RejectNegative Joined Undocumented
3070 ; Catch the gno- prefix, so it doesn't backtrack to g<level>.
3073 Common Driver Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
3074 Don't generate DWARF pubnames and pubtypes sections.
3077 Common Driver Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
3078 Generate DWARF pubnames and pubtypes sections.
3081 Common Driver Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
3082 Generate DWARF pubnames and pubtypes sections with GNU extensions.
3084 grecord-gcc-switches
3085 Common Driver Var(dwarf_record_gcc_switches) Init(1)
3086 Record gcc command line switches in DWARF DW_AT_producer.
3089 Common Driver Var(dwarf_split_debug_info) Init(0)
3090 Generate debug information in separate .dwo files.
3093 Common Driver JoinedOrMissing Negative(gstabs+)
3094 Generate debug information in STABS format.
3097 Common Driver JoinedOrMissing Negative(gvms)
3098 Generate debug information in extended STABS format.
3100 gstatement-frontiers
3101 Common Driver Var(debug_nonbind_markers_p) Init(2)
3102 Emit progressive recommended breakpoint locations.
3105 Common Driver Report Var(dwarf_strict) Init(0)
3106 Don't emit DWARF additions beyond selected version.
3109 Common Driver Report Var(flag_describe_dies) Init(0)
3110 Add description attributes to some DWARF DIEs that have no name attribute.
3113 Common Driver Report Var(flag_gtoggle)
3114 Toggle debug information generation.
3116 gvariable-location-views
3117 Common Driver Var(debug_variable_location_views, 1) Init(2)
3118 Augment variable location lists with progressive views.
3120 gvariable-location-views=incompat5
3121 Common Driver RejectNegative Var(debug_variable_location_views, -1) Init(2)
3124 Common Driver JoinedOrMissing Negative(gxcoff)
3125 Generate debug information in VMS format.
3128 Common Driver JoinedOrMissing Negative(gxcoff+)
3129 Generate debug information in XCOFF format.
3132 Common Driver JoinedOrMissing Negative(gdwarf)
3133 Generate debug information in extended XCOFF format.
3136 Name(compressed_debug_sections) Type(int)
3138 ; Since -gz= is completely handled in specs, the values aren't used and we
3139 ; assign arbitrary constants.
3141 Enum(compressed_debug_sections) String(none) Value(0)
3144 Enum(compressed_debug_sections) String(zlib) Value(1)
3147 Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
3151 Generate compressed debug sections.
3154 Common Driver RejectNegative Joined Enum(compressed_debug_sections)
3155 -gz=<format> Generate compressed debug sections in format <format>.
3158 Driver Joined Separate
3161 Common Joined Var(plugindir_string) Init(0)
3162 -iplugindir=<dir> Set <dir> to be the default plugin directory.
3165 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
3166 -imultiarch <dir> Set <dir> to be the multiarch include subdirectory.
3169 Driver Joined Separate
3174 no-canonical-prefixes
3190 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
3191 -o <file> Place output into <file>.
3194 Common Var(profile_flag)
3195 Enable function profiling.
3198 Driver Var(pass_exit_codes)
3201 Common Alias(Wpedantic)
3204 Common Var(flag_pedantic_errors)
3205 Like -pedantic but issue them as errors.
3211 Driver Var(use_pipes)
3214 Driver JoinedOrMissing Var(print_file_name)
3216 print-libgcc-file-name
3219 print-multi-directory
3220 Driver Var(print_multi_directory)
3223 Driver Var(print_multi_lib)
3225 print-multi-os-directory
3226 Driver Var(print_multi_os_directory)
3229 Driver Var(print_multiarch)
3232 Driver JoinedOrMissing Var(print_prog_name)
3235 Driver Var(print_search_dirs)
3238 Driver Var(print_sysroot)
3240 print-sysroot-headers-suffix
3241 Driver Var(print_sysroot_headers_suffix)
3244 Common Var(quiet_flag) RejectDriver
3245 Do not display functions compiled or elapsed time.
3263 Driver Var(report_times)
3266 Driver JoinedOrMissing
3269 Driver Joined Separate
3273 ; C option, but driver must not handle as "-u ndef".
3276 Common Driver Var(verbose_flag)
3277 Enable verbose output.
3280 Common Var(version_flag) RejectDriver
3281 Display the compiler's version.
3284 Common Var(inhibit_warnings)
3288 Driver Separate Var(wrapper_string)
3291 Driver Joined Separate
3294 Driver RejectNegative Negative(static-pie)
3295 Create a shared library.
3301 Driver Separate Alias(specs=)
3314 ; Documented for Fortran, but always accepted by driver.
3321 ; Documented for Go, but always accepted by driver.
3339 Driver RejectNegative Negative(shared)
3340 Don't create a dynamically linked position independent executable.
3343 Driver RejectNegative Negative(no-pie)
3344 Create a dynamically linked position independent executable.
3347 Driver RejectNegative Negative(pie)
3348 Create a static position independent executable.
3351 Driver Joined Separate
3354 Common Report Var(flag_ipa_ra) Optimization
3355 Use caller save register across calls if possible.
3357 ; This comment is to ensure we retain the blank line above.