1 ; Options for the language- and target-independent parts of the compiler.
3 ; Copyright (C) 2003-2015 Free Software Foundation, Inc.
5 ; This file is part of GCC.
7 ; GCC is free software; you can redistribute it and/or modify it under
8 ; the terms of the GNU General Public License as published by the Free
9 ; Software Foundation; either version 3, or (at your option) any later
12 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 ; You should have received a copy of the GNU General Public License
18 ; along with GCC; see the file COPYING3. If not see
19 ; <http://www.gnu.org/licenses/>.
21 ; See the GCC internals manual (options.texi) for a description of this file's format.
23 ; Please try to keep this file in ASCII collating order.
37 ; Not used directly to control optimizations, only to save -Ofast
38 ; setting for "optimize" attributes.
42 ; True if this is the lto front end. This is used to disable gimple
43 ; generation and lowering passes that are normally run on the output
44 ; of a front end. These passes must be bypassed for lto since they
45 ; have already been done before the gimple was written.
49 ; 0 means straightforward implementation of complex divide acceptable.
50 ; 1 means wide ranges of inputs must work for complex divide.
51 ; 2 means C99-like requirements for complex multiply and divide.
53 int flag_complex_method = 1
55 ; Nonzero if subexpressions must be evaluated from left-to-right.
57 int flag_evaluation_order = 0
59 ; Language specific warning pass for unused results.
61 bool flag_warn_unused_result = false
66 ; Nonzero if we should write GIMPLE bytecode for link-time optimization.
70 ; Nonzero if we should write GIMPLE bytecode for offload compilation.
72 int flag_generate_offload = 0
74 ; True to warn about any objects definitions whose size is larger
75 ; than N bytes. Also want about function definitions whose returned
76 ; values are larger than N bytes, where N is 'larger_than_size'.
81 HOST_WIDE_INT larger_than_size
83 ; True to warn about any function whose frame size is larger
86 bool warn_frame_larger_than
89 HOST_WIDE_INT frame_larger_than_size
91 ; Nonzero means we should be saving declaration info into a .X file.
93 int flag_gen_aux_info = 0
95 ; Nonzero if we are compiling code for a shared library, zero for
100 ; These two are really VEC(char_p,heap) *.
103 void *flag_instrument_functions_exclude_functions
106 void *flag_instrument_functions_exclude_files
108 ; Generic structs (e.g. templates not explicitly specialized)
109 ; may not have a compilation unit associated with them, and so
110 ; may need to be treated differently from ordinary structs.
112 ; Structs only handled by reference (indirectly), will also usually
113 ; not need as much debugging information.
116 enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
119 enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
121 ; True if we should exit after parsing options.
123 bool exit_after_options
125 ; Type(s) of debugging information we are producing (if any). See
126 ; flag-types.h for the definitions of the different possible types of
127 ; debugging information.
129 enum debug_info_type write_symbols = NO_DEBUG
131 ; Level of debugging information we are producing. See flag-types.h
132 ; for the definitions of the different possible levels.
134 enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
136 ; Nonzero means use GNU-only extensions in the generated symbolic
137 ; debugging information. Currently, this only has an effect when
138 ; write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG.
140 bool use_gnu_debug_info_extensions
142 ; Original value of maximum field alignment in bytes, specified via
143 ; -fpack-struct=<value>.
145 unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
147 ; Type of stack check.
149 enum stack_check_type flag_stack_check = NO_STACK_CHECK
151 ; True if stack usage information needs to be computed.
153 bool flag_stack_usage_info = false
155 ; -dA causes debug commentary information to be produced in
156 ; the generated assembly code (to make it more readable). This option
157 ; is generally only of use to those who actually need to read the
158 ; generated assembly code (perhaps while debugging the compiler itself).
159 ; Currently, this switch is only used by dwarf2out.c; however, it is intended
160 ; to be a catchall for printing debug information in the assembler file.
164 ; -dP causes the rtl to be emitted as a comment in assembly.
166 int flag_dump_rtl_in_asm
168 ; Whether -da was passed (used only in handle_common_deferred_options).
170 bool flag_dump_all_passed
172 ; Other flags saying which kinds of debugging dump have been requested.
175 int rtl_dump_and_exit
178 int flag_print_asm_name
180 ; Name of top-level original source file (what was input to cpp).
181 ; This comes from the #-command at the beginning of the actual input.
182 ; If there isn't any there, then this is the cc1 input file name.
184 const char *main_input_filename
186 ; Pointer to base name in main_input_filename, with directories and a
187 ; single final extension removed, and the length of this base
191 const char *main_input_basename
194 int main_input_baselength
196 ; Which options have been printed by --help.
200 ; Which enums have been printed by --help. 0 = not printed, no
201 ; relevant options seen, 1 = relevant option seen, not yet printed, 2
204 char *help_enum_printed
206 ; The number of columns for --help output.
208 unsigned int help_columns
210 ; Whether this options structure has been through finish_options
212 bool flag_opts_finished
214 ; What the sanitizer should instrument
216 unsigned int flag_sanitize
218 ; What sanitizers should recover from errors
220 unsigned int flag_sanitize_recover = SANITIZE_UNDEFINED | SANITIZE_NONDEFAULT | SANITIZE_KERNEL_ADDRESS
222 ; Flag whether a prefix has been added to dump_base_name
224 bool dump_base_name_prefixed = false
236 Driver Alias(coverage)
242 Common Separate Alias(d)
245 Common Joined Alias(d)
248 Common Separate Alias(dumpbase)
251 Common Separate Alias(dumpdir)
254 Driver Separate Alias(e)
257 Driver Joined Alias(e)
260 Common Warning Alias(Wextra)
263 Driver Separate Alias(Xassembler)
266 Driver JoinedOrMissing Alias(Xassembler)
269 Driver Separate Alias(Xlinker)
272 Driver JoinedOrMissing Alias(Xlinker)
275 Driver Separate Alias(u)
278 Driver Joined Alias(u)
281 Common Driver Var(help_flag)
282 Display this information
285 Common Driver Report Joined
286 --help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params
289 Driver Separate Alias(x)
292 Driver Joined Alias(x)
295 Driver Separate Alias(L)
298 Driver Joined Alias(L)
300 -no-canonical-prefixes
301 Driver Alias(no-canonical-prefixes)
303 -no-standard-libraries
304 Driver Alias(nostdlib)
307 Driver Var(no_sysroot_suffix)
316 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
319 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
322 Driver Alias(pass-exit-codes)
325 Common Alias(Wpedantic)
328 Common Alias(pedantic-errors)
337 Driver Separate Alias(B)
340 Driver JoinedOrMissing Alias(B)
346 Driver Separate Alias(print-file-name=)
349 Driver JoinedOrMissing Alias(print-file-name=)
351 -print-libgcc-file-name
352 Driver Alias(print-libgcc-file-name)
354 -print-multi-directory
355 Driver Alias(print-multi-directory)
358 Driver Alias(print-multi-lib)
360 -print-multi-os-directory
361 Driver Alias(print-multi-os-directory)
364 Driver Alias(print-multiarch)
367 Driver Separate Alias(print-prog-name=)
370 Driver JoinedOrMissing Alias(print-prog-name=)
373 Driver Alias(print-search-dirs)
376 Driver Alias(print-sysroot)
378 -print-sysroot-headers-suffix
379 Driver Alias(print-sysroot-headers-suffix)
385 Driver Alias(save-temps)
391 Driver Separate Alias(specs=)
394 Driver Joined Alias(specs=)
400 Driver Alias(symbolic)
404 Alias for --help=target
412 ;; The driver used to convert options such as --help into forms such
413 ;; as -fhelp; the following four entries are for compatibility with
414 ;; any direct uses of those (undocumented) -f forms
416 Common Driver Alias(-help)
419 Common Driver Joined Alias(-help=)
422 Common Driver Alias(-target-help)
425 Common Driver Alias(-version)
429 --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
432 Common Joined Alias(-param)
435 Driver Separate Alias(-sysroot=)
438 Driver JoinedOrMissing
444 Driver Joined Separate
450 Driver Joined Separate
456 Common JoinedOrMissing Optimization
457 -O<number> Set optimization level to <number>
461 Optimize for space rather than speed
465 Optimize for speed disregarding exact standards compliance
469 Optimize for debugging experience rather than speed or size
481 Driver Joined Separate
487 Driver Joined Separate
508 Common RejectNegative Warning Alias(Wextra)
509 This switch is deprecated; use -Wextra instead
512 Driver JoinedOrMissing
515 Driver JoinedOrMissing
518 Driver JoinedOrMissing
521 Common Var(warn_aggregate_return) Warning
522 Warn about returning structures, unions or arrays
524 Waggressive-loop-optimizations
525 Common Var(warn_aggressive_loop_optimizations) Init(1) Warning
526 Warn if a loop with constant number of iterations triggers undefined behavior
529 Common Var(warn_array_bounds) Warning
530 Warn if an array is accessed out of bounds
533 Common Joined RejectNegative UInteger Var(warn_array_bounds) Warning
534 Warn if an array is accessed out of bounds
537 Common Var(warn_attributes) Init(1) Warning
538 Warn about inappropriate attribute usage
541 Common Var(warn_cast_align) Warning
542 Warn about pointer casts which increase alignment
545 Common Var(warn_cpp) Init(1) Warning
546 Warn when a #warning directive is encountered
548 Wdeprecated-declarations
549 Common Var(warn_deprecated_decl) Init(1) Warning
550 Warn about uses of __attribute__((deprecated)) declarations
552 Wdisabled-optimization
553 Common Var(warn_disabled_optimization) Warning
554 Warn when an optimization pass is disabled
557 Common Var(warnings_are_errors)
558 Treat all warnings as errors
562 Treat specified warning as error
565 Common Var(extra_warnings) Warning
566 Print extra (possibly unwanted) warnings
569 Common Var(flag_fatal_errors)
570 Exit on the first error occurred
573 Common RejectNegative Joined UInteger
574 -Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
577 Common Var(warn_free_nonheap_object) Init(1) Warning
578 Warn when attempting to free a non-heap object
581 Common Var(warn_inline) Warning
582 Warn when an inlined function cannot be inlined
584 Winvalid-memory-model
585 Common Var(warn_invalid_memory_model) Init(1) Warning
586 Warn when an atomic memory model parameter is known to be outside the valid range.
589 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
592 Common RejectNegative Joined UInteger Warning
593 -Wlarger-than=<number> Warn if an object is larger than <number> bytes
596 Common Var(warn_null_dereference) Warning
597 Warn if dereferencing a NULL pointer may lead to erroneous or undefined behavior
599 Wunsafe-loop-optimizations
600 Common Var(warn_unsafe_loop_optimizations) Warning
601 Warn if the loop cannot be optimized due to nontrivial assumptions.
604 Common Alias(Wsuggest-attribute=noreturn)
607 Common Var(warn_odr_violations) Init(1) Warning
608 Warn about some C++ One Definition Rule violations during link time optimization
611 Common Var(warn_overflow) Init(1) Warning
612 Warn about overflow in arithmetic expressions
615 Common Var(warn_lto_type_mismatch) Init(1) Warning
616 During link time optimization warn about mismatched types of global declarations
619 Common Var(warn_packed) Warning
620 Warn when the packed attribute has no effect on struct layout
623 Common Var(warn_padded) Warning
624 Warn when padding is required to align structure members
627 Common Var(pedantic) Init(0) Warning
628 Issue warnings needed for strict compliance to the standard
631 Common Var(warn_return_local_addr) Init(1) Warning
632 Warn about returning a pointer/reference to a local or temporary variable.
635 Common Var(warn_shadow) Warning
636 Warn when one local variable shadows another
639 Common Var(warn_stack_protect) Warning
640 Warn when not issuing stack smashing protection for some reason
643 Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
644 Warn if stack usage might be larger than specified amount
648 Warn about code which might break strict aliasing rules
651 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
652 Warn about code which might break strict aliasing rules
656 Warn about optimizations that assume that signed overflow is undefined
659 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
660 Warn about optimizations that assume that signed overflow is undefined
662 Wsuggest-attribute=const
663 Common Var(warn_suggest_attribute_const) Warning
664 Warn about functions which might be candidates for __attribute__((const))
666 Wsuggest-attribute=pure
667 Common Var(warn_suggest_attribute_pure) Warning
668 Warn about functions which might be candidates for __attribute__((pure))
670 Wsuggest-attribute=noreturn
671 Common Var(warn_suggest_attribute_noreturn) Warning
672 Warn about functions which might be candidates for __attribute__((noreturn))
675 Common Var(warn_suggest_final_types) Warning
676 Warn about C++ polymorphic types where adding final keyword would improve code quality
678 Wsuggest-final-methods
679 Common Var(warn_suggest_final_methods) Warning
680 Warn about C++ virtual methods where adding final keyword would improve code quality
683 Common Var(warn_system_headers) Warning
684 Do not suppress warnings from system headers
687 Common Var(warn_trampolines) Warning
688 Warn whenever a trampoline is generated
691 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
692 Warn if a comparison is always true or always false due to the limited range of the data type
695 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
696 Warn about uninitialized automatic variables
699 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
700 Warn about maybe uninitialized automatic variables
704 Does nothing. Preserved for backward compatibility.
707 Common Var(warn_unused) Init(0) Warning
708 Enable all -Wunused- warnings
710 Wunused-but-set-parameter
711 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
712 Warn when a function parameter is only set, otherwise unused
714 Wunused-but-set-variable
715 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
716 Warn when a variable is only set, otherwise unused
719 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
720 Warn when a function is unused
723 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
724 Warn when a label is unused
727 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
728 Warn when a function parameter is unused
731 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
732 Warn when an expression value is unused
735 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
736 Warn when a variable is unused
739 Common Var(warn_coverage_mismatch) Init(1) Warning
740 Warn in case profiles in -fprofile-use do not match
742 Wvector-operation-performance
743 Common Var(warn_vector_operation_performance) Warning
744 Warn when a vector operation is compiled outside the SIMD
759 Common Separate Var(aux_info_file_name)
760 -aux-info <file> Emit declaration information into <file>
763 Common Joined Alias(aux-info)
766 Common Separate RejectDriver Var(aux_base_name)
769 Common Separate RejectDriver
779 -d<letters> Enable dumps from specific passes of the compiler
782 Common Separate Var(dump_base_name)
783 -dumpbase <file> Set the file basename to be used for dumps
786 Common Separate Var(dump_dir_name)
787 -dumpdir <dir> Set the directory name to be used for dumps
799 Driver Joined Separate
801 ; This option has historically been passed down to the linker by an
802 ; accident of a %{e*} spec, so ensure it continues to be passed down
803 ; as a single option. The supported option for this purpose is
804 ; -rdynamic. See PR 47390.
808 ; The version of the C++ ABI in use. The following values are allowed:
810 ; 0: The version of the ABI believed most conformant with the C++ ABI
811 ; specification. This ABI may change as bugs are discovered and fixed.
812 ; Therefore, 0 will not necessarily indicate the same ABI in different
815 ; 1: The version of the ABI first used in G++ 3.2. No longer selectable.
817 ; 2: The version of the ABI first used in G++ 3.4, and the default
820 ; 3: The version of the ABI that fixes the missing underscore
821 ; in template non-type arguments of pointer type.
823 ; 4: The version of the ABI that introduces unambiguous mangling of
824 ; vector types. First selectable in G++ 4.5.
826 ; 5: The version of the ABI that ignores attribute const/noreturn
827 ; in function pointer mangling, and corrects mangling of decltype and
828 ; function parameters used in other parameters and the return type.
829 ; First selectable in G++ 4.6.
831 ; 6: The version of the ABI that doesn't promote scoped enums to int and
832 ; changes the mangling of template argument packs, const/static_cast,
833 ; prefix ++ and --, and a class scope function used as a template
835 ; First selectable in G++ 4.7.
837 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
838 ; corrects the mangling of lambdas in default argument scope.
839 ; First selectable in G++ 4.8.
841 ; 8: The version of the ABI that corrects the substitution behavior of
842 ; function types with function-cv-qualifiers.
843 ; First selectable in G++ 4.9 and default in G++ 5.
845 ; 9: The version of the ABI that corrects the alignment of nullptr_t.
846 ; First selectable and default in G++ 5.2.
848 ; 10: The version of the ABI that mangles attributes that affect type
849 ; identity, such as ia32 calling convention attributes (stdcall, etc.)
850 ; Default in G++ 6 (set in c_common_post_options).
852 ; Additional positive integers will be assigned as new versions of
853 ; the ABI become the default version of the ABI.
855 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(0)
856 The version of the C++ ABI in use
858 faggressive-loop-optimizations
859 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
860 Aggressively optimize loops using language constraints
863 Common Report Var(align_functions,0) Optimization UInteger
864 Align the start of functions
867 Common RejectNegative Joined UInteger Var(align_functions)
870 Common Report Var(align_jumps,0) Optimization UInteger
871 Align labels which are only reached by jumping
874 Common RejectNegative Joined UInteger Var(align_jumps)
877 Common Report Var(align_labels,0) Optimization UInteger
881 Common RejectNegative Joined UInteger Var(align_labels)
884 Common Report Var(align_loops,0) Optimization UInteger
885 Align the start of loops
888 Common RejectNegative Joined UInteger Var(align_loops)
892 Does nothing. Preserved for backward compatibility.
896 Does nothing. Preserved for backward compatibility.
898 fargument-noalias-global
900 Does nothing. Preserved for backward compatibility.
902 fargument-noalias-anything
904 Does nothing. Preserved for backward compatibility.
907 Common Driver Report Joined
908 Select what to sanitize
911 Common Joined RejectNegative Var(common_deferred_options) Defer
912 -fasan-shadow-offset=<number> Use custom shadow memory offset.
915 Common Joined RejectNegative Var(common_deferred_options) Defer
916 -fsanitize-sections=<sec1,sec2,...> Sanitize global variables
917 in user-defined sections.
921 After diagnosing undefined behavior attempt to continue execution
925 This switch is deprecated; use -fsanitize-recover= instead
927 fsanitize-undefined-trap-on-error
928 Common Driver Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
929 Use trap instead of a library function for undefined behavior sanitization
931 fasynchronous-unwind-tables
932 Common Report Var(flag_asynchronous_unwind_tables) Optimization
933 Generate unwind tables that are exact at each instruction boundary
936 Common Report Var(flag_auto_inc_dec) Init(1) Optimization
937 Generate auto-inc/dec instructions
940 Common Report Var(flag_auto_profile)
941 Use sample profile information for call graph node weights. The default
942 profile file is fbdata.afdo in 'pwd'.
945 Common Joined RejectNegative Var(auto_profile_file)
946 Use sample profile information for call graph node weights. The profile
947 file is specified in the argument.
949 ; -fcheck-bounds causes gcc to generate array bounds checks.
950 ; For C, C++ and ObjC: defaults off.
951 ; For Java: defaults to on.
952 ; For Fortran: defaults to off.
954 Common Report Var(flag_bounds_check)
955 Generate code to check bounds before indexing arrays
958 Common Report Var(flag_branch_on_count_reg) Optimization
959 Replace add, compare, branch with branch on count register
961 fbranch-probabilities
962 Common Report Var(flag_branch_probabilities) Optimization
963 Use profiling information for branch probabilities
965 fbranch-target-load-optimize
966 Common Report Var(flag_branch_target_load_optimize) Optimization
967 Perform branch target load optimization before prologue / epilogue threading
969 fbranch-target-load-optimize2
970 Common Report Var(flag_branch_target_load_optimize2) Optimization
971 Perform branch target load optimization after prologue / epilogue threading
974 Common Report Var(flag_btr_bb_exclusive) Optimization
975 Restrict target load migration not to re-use registers in any basic block
978 Common Joined RejectNegative Var(common_deferred_options) Defer
979 -fcall-saved-<register> Mark <register> as being preserved across functions
982 Common Joined RejectNegative Var(common_deferred_options) Defer
983 -fcall-used-<register> Mark <register> as being corrupted by function calls
985 ; Nonzero for -fcaller-saves: allocate values in regs that need to
986 ; be saved across function calls, if that produces overall better code.
987 ; Optional now, so people can test it.
989 Common Report Var(flag_caller_saves) Optimization
990 Save registers around function calls
993 Common Report Var(flag_check_data_deps)
994 This switch is deprecated; do not use.
997 Common Var(flag_check_new)
998 Check the return value of new in C++
1000 fcombine-stack-adjustments
1001 Common Report Var(flag_combine_stack_adjustments) Optimization
1002 Looks for opportunities to reduce stack adjustments and stack references.
1005 Common Report Var(flag_no_common,0)
1006 Do not put uninitialized globals in the common section
1010 ; Converted by the driver to -fcompare-debug= options.
1013 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
1014 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
1016 fcompare-debug-second
1017 Common Driver RejectNegative Var(flag_compare_debug)
1018 Run only the second compilation of -fcompare-debug
1021 Common Report Var(flag_compare_elim_after_reload) Optimization
1022 Perform comparison elimination after register allocation has finished
1025 Common Var(flag_conserve_stack) Optimization
1026 Do not perform optimizations increasing noticeably stack usage
1029 Common Report Var(flag_cprop_registers) Optimization
1030 Perform a register copy-propagation optimization pass
1033 Common Report Var(flag_crossjumping) Optimization
1034 Perform cross-jumping optimization
1037 Common Report Var(flag_cse_follow_jumps) Optimization
1038 When running CSE, follow jumps to their targets
1042 Does nothing. Preserved for backward compatibility.
1045 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
1046 Omit range reduction step when performing complex division
1049 Common Report Var(flag_cx_fortran_rules) Optimization
1050 Complex multiplication and division follow Fortran rules
1053 Common Report Var(flag_data_sections)
1054 Place data items into their own section
1057 Common Report Var(common_deferred_options) Defer
1058 List all available debugging counters with their limits and counts.
1061 Common RejectNegative Joined Var(common_deferred_options) Defer
1062 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
1065 Common Joined RejectNegative Var(common_deferred_options) Defer
1066 Map one directory name to another in debug information
1068 fdebug-types-section
1069 Common Report Var(flag_debug_types_section) Init(0)
1070 Output .debug_types section when using DWARF v4 debuginfo.
1072 ; Nonzero for -fdefer-pop: don't pop args after each function call
1073 ; instead save them up to pop many calls' args with one insns.
1075 Common Report Var(flag_defer_pop) Optimization
1076 Defer popping functions args from stack until later
1079 Common Report Var(flag_delayed_branch) Optimization
1080 Attempt to fill delay slots of branch instructions
1082 fdelete-dead-exceptions
1083 Common Report Var(flag_delete_dead_exceptions) Init(0) Optimization
1084 Delete dead instructions that may throw exceptions
1086 fdelete-null-pointer-checks
1087 Common Report Var(flag_delete_null_pointer_checks) Init(-1) Optimization
1088 Delete useless null pointer checks
1090 fdevirtualize-at-ltrans
1091 Common Report Var(flag_ltrans_devirtualize)
1092 Stream extra data to support more aggressive devirtualization in LTO local transformation mode
1094 fdevirtualize-speculatively
1095 Common Report Var(flag_devirtualize_speculatively) Optimization
1096 Perform speculative devirtualization
1099 Common Report Var(flag_devirtualize) Optimization
1100 Try to convert virtual calls to direct ones.
1102 fdiagnostics-show-location=
1103 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1104 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
1106 ; Required for these enum values.
1111 Name(diagnostic_prefixing_rule) Type(int)
1114 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1117 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1119 fdiagnostics-show-caret
1120 Common Var(flag_diagnostics_show_caret) Init(1)
1121 Show the source line with a caret indicating the column
1124 Common Alias(fdiagnostics-color=,always,never)
1128 Driver Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1129 -fdiagnostics-color=[never|always|auto] Colorize diagnostics
1131 ; Required for these enum values.
1136 Name(diagnostic_color_rule) Type(int)
1139 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1142 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1145 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1147 fdiagnostics-show-option
1148 Common Var(flag_diagnostics_show_option) Init(1)
1149 Amend appropriate diagnostic messages with the command line option that controls them
1152 Common Joined RejectNegative Var(common_deferred_options) Defer
1153 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1156 Common Joined RejectNegative Var(common_deferred_options) Defer
1157 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1160 Common Joined RejectNegative Var(common_deferred_options) Defer
1161 -fdump-<type> Dump various compiler internals to a file
1164 Driver RejectNegative
1167 Common RejectNegative Joined Var(flag_dump_final_insns)
1168 -fdump-final-insns=filename Dump to filename the insns at the end of translation
1171 Common RejectNegative Joined Var(flag_dump_go_spec)
1172 -fdump-go-spec=filename Write all declarations to file as Go code
1175 Common Report Var(flag_dump_noaddr)
1176 Suppress output of addresses in debugging dumps
1179 Common Driver Var(flag_report_bug)
1180 Collect and dump debug information into temporary file if ICE in C/C++
1183 fdump-internal-locations
1184 Common Var(flag_dump_locations) Init(0)
1185 Dump detailed information on GCC's internal representation of source code locations
1188 Common Var(flag_dump_passes) Init(0)
1189 Dump optimization passes
1192 Common Report Var(flag_dump_unnumbered)
1193 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1195 fdump-unnumbered-links
1196 Common Report Var(flag_dump_unnumbered_links)
1197 Suppress output of previous and next insn numbers in debugging dumps
1200 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1201 Enable CFI tables via GAS assembler directives.
1204 Common Report Var(flag_early_inlining) Init(1) Optimization
1205 Perform early inlining
1207 feliminate-dwarf2-dups
1208 Common Report Var(flag_eliminate_dwarf2_dups)
1209 Perform DWARF2 duplicate elimination
1212 Common Report Var(flag_ipa_sra) Init(0) Optimization
1213 Perform interprocedural reduction of aggregates
1215 feliminate-unused-debug-symbols
1216 Common Report Var(flag_debug_only_used_symbols)
1217 Perform unused symbol elimination in debug info
1219 feliminate-unused-debug-types
1220 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1221 Perform unused type elimination in debug info
1223 femit-class-debug-always
1224 Common Report Var(flag_emit_class_debug_always) Init(0)
1225 Do not suppress C++ class debug information.
1228 Common Report Var(flag_exceptions) Optimization
1229 Enable exception handling
1231 fexpensive-optimizations
1232 Common Report Var(flag_expensive_optimizations) Optimization
1233 Perform a number of minor, expensive optimizations
1236 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1237 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1240 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1243 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1246 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1252 Common Var(flag_fat_lto_objects)
1253 Output lto objects containing both the intermediate language and binary output.
1256 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1257 Assume no NaNs or infinities are generated
1260 Common Joined RejectNegative Var(common_deferred_options) Defer
1261 -ffixed-<register> Mark <register> as being unavailable to the compiler
1264 Common Report Var(flag_float_store) Optimization
1265 Don't allocate floats and doubles in extended-precision registers
1269 Does nothing. Preserved for backward compatibility.
1272 Common Report Var(flag_forward_propagate) Optimization
1273 Perform a forward propagation pass on RTL
1276 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST) Optimization
1277 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1280 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1283 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1285 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1287 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1290 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1292 ; Nonzero means don't put addresses of constant functions in registers.
1293 ; Used for compiling the Unix kernel, where strange substitutions are
1294 ; done on the assembly output.
1296 Common Report Var(flag_no_function_cse,0) Optimization
1297 Allow function addresses to be held in registers
1300 Common Report Var(flag_function_sections)
1301 Place each function into its own section
1304 Common Report Var(flag_gcse) Optimization
1305 Perform global common subexpression elimination
1308 Common Report Var(flag_gcse_lm) Init(1) Optimization
1309 Perform enhanced load motion during global common subexpression elimination
1312 Common Report Var(flag_gcse_sm) Init(0) Optimization
1313 Perform store motion after global common subexpression elimination
1316 Common Report Var(flag_gcse_las) Init(0) Optimization
1317 Perform redundant load after store elimination in global common subexpression
1321 Common Report Var(flag_gcse_after_reload) Optimization
1322 Perform global common subexpression elimination after register allocation
1325 ; This option is not documented yet as its semantics will change.
1327 Common Report Var(flag_graphite) Optimization
1328 Enable in and out of Graphite representation
1331 Common Report Var(flag_graphite_identity) Optimization
1332 Enable Graphite Identity transformation
1334 fhoist-adjacent-loads
1335 Common Report Var(flag_hoist_adjacent_loads) Optimization
1336 Enable hoisting adjacent loads to encourage generating conditional move
1339 floop-parallelize-all
1340 Common Report Var(flag_loop_parallelize_all) Optimization
1341 Mark all loops as parallel
1344 Common Alias(floop-nest-optimize)
1345 Enable loop nest transforms. Same as -floop-nest-optimize
1348 Common Alias(floop-nest-optimize)
1349 Enable loop nest transforms. Same as -floop-nest-optimize
1352 Common Alias(floop-nest-optimize)
1353 Enable loop nest transforms. Same as -floop-nest-optimize
1355 floop-unroll-and-jam
1356 Common Alias(floop-nest-optimize)
1357 Enable loop nest transforms. Same as -floop-nest-optimize
1360 Common Report Var(flag_tm)
1361 Enable support for GNU transactional memory
1364 Common Report Var(flag_gnu_unique) Init(1)
1365 Use STB_GNU_UNIQUE if supported by the assembler
1369 Does nothing. Preserved for backward compatibility.
1372 Common Report Var(flag_loop_optimize_isl) Optimization
1373 Enable the ISL based loop nest optimizer
1375 fstrict-volatile-bitfields
1376 Common Report Var(flag_strict_volatile_bitfields) Init(-1) Optimization
1377 Force bitfield accesses to match their type width
1379 fguess-branch-probability
1380 Common Report Var(flag_guess_branch_prob) Optimization
1381 Enable guessing of branch probabilities
1383 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1384 ; Generate position-independent code for executables if possible
1385 ; On SVR4 targets, it also controls whether or not to emit a
1386 ; string identifying the compiler.
1388 Common Report Var(flag_no_ident,0)
1389 Process #ident directives
1392 Common Report Var(flag_if_conversion) Optimization
1393 Perform conversion of conditional jumps to branchless equivalents
1396 Common Report Var(flag_if_conversion2) Optimization
1397 Perform conversion of conditional jumps to conditional execution
1400 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL) Optimization
1401 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1404 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1407 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1410 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1413 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1415 ftree-loop-if-convert
1416 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1417 Convert conditional jumps in innermost loops to branchless equivalents
1419 ftree-loop-if-convert-stores
1420 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1421 Also if-convert conditional jumps containing memory writes
1423 ; -finhibit-size-directive inhibits output of .size for ELF.
1424 ; This is used only for compiling crtstuff.c,
1425 ; and it may be extended to other effects
1426 ; needed for crtstuff.c on other systems.
1427 finhibit-size-directive
1428 Common Report Var(flag_inhibit_size_directive)
1429 Do not generate .size directives
1432 Common Report Var(flag_indirect_inlining) Optimization
1433 Perform indirect inlining
1435 ; General flag to enable inlining. Specifying -fno-inline will disable
1436 ; all inlining apart from always-inline functions.
1438 Common Report Var(flag_no_inline,0) Init(0) Optimization
1439 Enable inlining of function declared \"inline\", disabling disables all inlining
1441 finline-small-functions
1442 Common Report Var(flag_inline_small_functions) Optimization
1443 Integrate functions into their callers when code size is known not to grow
1446 Common Report Var(flag_inline_functions) Optimization
1447 Integrate functions not declared \"inline\" into their callers when profitable
1449 finline-functions-called-once
1450 Common Report Var(flag_inline_functions_called_once) Optimization
1451 Integrate functions only required by their single caller
1454 Common RejectNegative Joined Alias(finline-limit=)
1457 Common RejectNegative Joined UInteger
1458 -finline-limit=<number> Limit the size of inlined functions to <number>
1461 Common Report Var(flag_inline_atomics) Init(1) Optimization
1462 Inline __atomic operations when a lock free instruction sequence is available.
1464 finstrument-functions
1465 Common Report Var(flag_instrument_function_entry_exit)
1466 Instrument function entry and exit with profiling calls
1468 finstrument-functions-exclude-function-list=
1469 Common RejectNegative Joined
1470 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1472 finstrument-functions-exclude-file-list=
1473 Common RejectNegative Joined
1474 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1477 Common Report Var(flag_ipa_cp) Optimization
1478 Perform interprocedural constant propagation
1481 Common Report Var(flag_ipa_cp_clone) Optimization
1482 Perform cloning to make Interprocedural constant propagation stronger
1485 Common Report Var(flag_ipa_cp_alignment) Optimization
1486 Perform alignment discovery and propagation to make Interprocedural constant propagation stronger
1489 Common Report Var(flag_ipa_profile) Init(0) Optimization
1490 Perform interprocedural profile propagation
1493 Common Report Var(flag_ipa_pta) Init(0) Optimization
1494 Perform interprocedural points-to analysis
1497 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1498 Discover pure and const functions
1501 Common Report Var(flag_ipa_icf) Optimization
1502 Perform Identical Code Folding for functions and read-only variables
1505 Common Report Var(flag_ipa_icf_functions) Optimization
1506 Perform Identical Code Folding for functions
1509 Common Report Var(flag_ipa_icf_variables)
1510 Perform Identical Code Folding for variables
1513 Common Report Var(flag_ipa_reference) Init(0) Optimization
1514 Discover readonly and non addressable static variables
1518 Does nothing. Preserved for backward compatibility.
1522 Does nothing. Preserved for backward compatibility.
1525 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB) Optimization
1526 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1529 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1532 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1535 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1538 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT) Optimization
1539 -fira-region=[one|all|mixed] Set regions for IRA
1542 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1545 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1548 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1551 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1554 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1555 Use IRA based register pressure calculation
1556 in RTL hoist optimizations.
1559 Common Report Var(flag_ira_loop_pressure) Optimization
1560 Use IRA based register pressure calculation
1561 in RTL loop optimizations.
1563 fira-share-save-slots
1564 Common Report Var(flag_ira_share_save_slots) Init(1) Optimization
1565 Share slots for saving different hard registers.
1567 fira-share-spill-slots
1568 Common Report Var(flag_ira_share_spill_slots) Init(1) Optimization
1569 Share stack slots for spilled pseudo-registers.
1572 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1573 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1576 Common Report Var(flag_ivopts) Init(1) Optimization
1577 Optimize induction variables on trees
1580 Common Var(flag_jump_tables) Init(1) Optimization
1581 Use jump tables for sufficiently large switch statements
1583 fkeep-inline-functions
1584 Common Report Var(flag_keep_inline_functions)
1585 Generate code for functions even if they are fully inlined
1588 Common Report Var(flag_keep_static_consts) Init(1)
1589 Emit static const variables even if they are not used
1592 Common Report Var(flag_leading_underscore) Init(-1)
1593 Give external symbols a leading underscore
1597 Does nothing. Preserved for backward compatibility.
1600 Common Report Var(flag_lra_remat) Optimization
1601 Do CFG-sensitive rematerialization in LRA
1605 Enable link-time optimization.
1608 Common RejectNegative Joined Var(flag_lto)
1609 Link-time optimization with number of parallel jobs or jobserver.
1612 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1615 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1618 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1621 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1624 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1627 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1630 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1631 Specify the algorithm to partition symbols and vars at linktime
1633 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1634 flto-compression-level=
1635 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1636 -flto-compression-level=<number> Use zlib compression level <number> for IL
1638 flto-odr-type-merging
1639 Common Report Var(flag_lto_odr_type_mering) Init(1)
1640 Merge C++ types using One Definition Rule
1643 Common Report Var(flag_lto_report) Init(0)
1644 Report various link-time optimization statistics
1647 Common Report Var(flag_lto_report_wpa) Init(0)
1648 Report various link-time optimization statistics for WPA only
1651 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1652 Set errno after built-in math functions
1655 Common Joined RejectNegative UInteger Var(flag_max_errors)
1656 -fmax-errors=<number> Maximum number of errors to report
1659 Common Report Var(mem_report)
1660 Report on permanent memory allocation
1663 Common Report Var(mem_report_wpa)
1664 Report on permanent memory allocation in WPA only
1666 ; This will attempt to merge constant section constants, if 1 only
1667 ; string constants and constants from constant pool, if 2 also constant
1669 fmerge-all-constants
1670 Common Report Var(flag_merge_constants,2) Init(1)
1671 Attempt to merge identical constants and constant variables
1674 Common Report Var(flag_merge_constants,1)
1675 Attempt to merge identical constants across compilation units
1677 fmerge-debug-strings
1678 Common Report Var(flag_merge_debug_strings) Init(1)
1679 Attempt to merge identical debug strings across compilation units
1682 Common RejectNegative Joined UInteger
1683 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1686 Common Report Var(flag_modulo_sched) Optimization
1687 Perform SMS based modulo scheduling before the first scheduling pass
1689 fmodulo-sched-allow-regmoves
1690 Common Report Var(flag_modulo_sched_allow_regmoves) Optimization
1691 Perform SMS based modulo scheduling with register moves allowed
1693 fmove-loop-invariants
1694 Common Report Var(flag_move_loop_invariants) Optimization
1695 Move loop invariant computations out of loops
1698 Common Var(flag_dce) Init(1) Optimization
1699 Use the RTL dead code elimination pass
1702 Common Var(flag_dse) Init(1) Optimization
1703 Use the RTL dead store elimination pass
1705 freschedule-modulo-scheduled-loops
1706 Common Report Var(flag_resched_modulo_sched) Optimization
1707 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1709 fnon-call-exceptions
1710 Common Report Var(flag_non_call_exceptions) Optimization
1711 Support synchronous non-call exceptions
1714 Common Driver Joined MissingArgError(options or targets missing after %qs)
1715 -foffload=<targets>=<options> Specify offloading targets and options for them
1718 Common Joined RejectNegative Enum(offload_abi) Var(flag_offload_abi) Init(OFFLOAD_ABI_UNSET)
1719 -foffload-abi=[lp64|ilp32] Set the ABI to use in an offload compiler
1722 Name(offload_abi) Type(enum offload_abi) UnknownError(unknown offload ABI %qs)
1725 Enum(offload_abi) String(ilp32) Value(OFFLOAD_ABI_ILP32)
1728 Enum(offload_abi) String(lp64) Value(OFFLOAD_ABI_LP64)
1731 Common Report Var(flag_omit_frame_pointer) Optimization
1732 When possible do not generate stack frames
1735 Common Report Var(flag_opt_info) Optimization
1736 Enable all optimization info dumps on stderr
1739 Common Joined RejectNegative Var(common_deferred_options) Defer
1740 -fopt-info[-<type>=filename] Dump compiler optimization details
1742 foptimize-register-move
1744 Does nothing. Preserved for backward compatibility.
1746 foptimize-sibling-calls
1747 Common Report Var(flag_optimize_sibling_calls) Optimization
1748 Optimize sibling and tail recursive calls
1751 Common Report Var(flag_partial_inlining) Optimization
1752 Perform partial inlining
1755 Common Report Var(pre_ipa_mem_report)
1756 Report on memory allocation before interprocedural optimization
1758 fpost-ipa-mem-report
1759 Common Report Var(post_ipa_mem_report)
1760 Report on memory allocation before interprocedural optimization
1763 Common Report Var(flag_pack_struct) Optimization
1764 Pack structure members together without holes
1767 Common RejectNegative Joined UInteger Optimization
1768 -fpack-struct=<number> Set initial maximum structure member alignment
1771 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1772 Return small aggregates in memory, not registers
1775 Common Report Var(flag_peel_loops) Optimization
1776 Perform loop peeling
1779 Common Report Var(flag_no_peephole,0) Optimization
1780 Enable machine specific peephole optimizations
1783 Common Report Var(flag_peephole2) Optimization
1784 Enable an RTL peephole pass before sched2
1787 Common Report Var(flag_pic,2) Negative(fPIE)
1788 Generate position-independent code if possible (large mode)
1791 Common Report Var(flag_pie,2) Negative(fpic) Init(-1)
1792 Generate position-independent code for executables if possible (large mode)
1795 Common Report Var(flag_pic,1) Negative(fpie)
1796 Generate position-independent code if possible (small mode)
1799 Common Report Var(flag_pie,1) Negative(fPIC) Init(-1)
1800 Generate position-independent code for executables if possible (small mode)
1803 Common Report Var(flag_plt) Init(1) Optimization
1804 Use PLT for PIC calls (-fno-plt: load the address from GOT at call site)
1807 Common Joined RejectNegative Var(common_deferred_options) Defer
1808 Specify a plugin to load
1811 Common Joined RejectNegative Var(common_deferred_options) Defer
1812 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1814 fpredictive-commoning
1815 Common Report Var(flag_predictive_commoning) Optimization
1816 Run predictive commoning optimization.
1818 fprefetch-loop-arrays
1819 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1820 Generate prefetch instructions, if available, for arrays in loops
1823 Common Report Var(profile_flag)
1824 Enable basic program profiling code
1827 Common Report Var(profile_arc_flag)
1828 Insert arc-based program profiling code
1831 Common Joined RejectNegative Var(profile_data_prefix)
1832 Set the top-level directory for storing the profile data.
1833 The default is 'pwd'.
1836 Common Report Var(flag_profile_correction)
1837 Enable correction of flow inconsistent profile data input
1841 Enable common options for generating profile info for profile feedback directed optimizations
1844 Common Joined RejectNegative
1845 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1848 Common Var(flag_profile_use)
1849 Enable common options for performing profile feedback directed optimizations
1852 Common Joined RejectNegative
1853 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1856 Common Report Var(flag_profile_values)
1857 Insert code to profile values of expressions
1860 Common Report Var(profile_report)
1861 Report on consistency of profile
1863 fprofile-reorder-functions
1864 Common Report Var(flag_profile_reorder_functions)
1865 Enable function reordering that improves code placement
1868 Common Var(common_deferred_options) Defer
1871 Common Joined RejectNegative Var(common_deferred_options) Defer
1872 -frandom-seed=<number> Make compile reproducible using <number>
1874 ; This switch causes the command line that was used to create an
1875 ; object file to be recorded into the object file. The exact format
1876 ; of this recording is target and binary file format dependent.
1877 ; It is related to the -fverbose-asm switch, but that switch only
1878 ; records information in the assembler output file as comments, so
1879 ; they never reach the object file.
1880 frecord-gcc-switches
1881 Common Report Var(flag_record_gcc_switches)
1882 Record gcc command line switches in the object file.
1885 Common Report Var(flag_pcc_struct_return,0) Optimization
1886 Return small aggregates in registers
1890 Does nothing. Preserved for backward compatibility.
1893 Common Report Var(flag_lifetime_dse) Init(1) Optimization
1894 Tell DSE that the storage for a C++ object is dead when the constructor
1895 starts and when the destructor finishes.
1897 flive-range-shrinkage
1898 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
1899 Relief of register pressure through live range shrinkage
1902 Common Report Var(flag_rename_registers) Init(2) Optimization
1903 Perform a register renaming optimization pass
1906 Common Report Var(flag_schedule_fusion) Init(2) Optimization
1907 Perform a target dependent instruction fusion optimization pass
1910 Common Report Var(flag_reorder_blocks) Optimization
1911 Reorder basic blocks to improve code placement
1913 freorder-blocks-algorithm=
1914 Common Joined RejectNegative Enum(reorder_blocks_algorithm) Var(flag_reorder_blocks_algorithm) Init(REORDER_BLOCKS_ALGORITHM_SIMPLE) Optimization
1915 -freorder-blocks-algorithm=[simple|stc] Set the used basic block reordering algorithm
1918 Name(reorder_blocks_algorithm) Type(enum reorder_blocks_algorithm) UnknownError(unknown basic block reordering algorithm %qs)
1921 Enum(reorder_blocks_algorithm) String(simple) Value(REORDER_BLOCKS_ALGORITHM_SIMPLE)
1924 Enum(reorder_blocks_algorithm) String(stc) Value(REORDER_BLOCKS_ALGORITHM_STC)
1926 freorder-blocks-and-partition
1927 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1928 Reorder basic blocks and partition into hot and cold sections
1931 Common Report Var(flag_reorder_functions) Optimization
1932 Reorder functions to improve code placement
1934 frerun-cse-after-loop
1935 Common Report Var(flag_rerun_cse_after_loop) Optimization
1936 Add a common subexpression elimination pass after loop optimizations
1940 Does nothing. Preserved for backward compatibility.
1943 Common Report Var(flag_rounding_math) Optimization SetByCombined
1944 Disable optimizations that assume default FP rounding behavior
1947 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1948 Enable scheduling across basic blocks
1951 Common Report Var(flag_sched_pressure) Init(0) Optimization
1952 Enable register pressure sensitive insn scheduling
1955 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1956 Allow speculative motion of non-loads
1959 Common Report Var(flag_schedule_speculative_load) Optimization
1960 Allow speculative motion of some loads
1962 fsched-spec-load-dangerous
1963 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1964 Allow speculative motion of more loads
1967 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1968 -fsched-verbose=<number> Set the verbosity level of the scheduler
1970 fsched2-use-superblocks
1971 Common Report Var(flag_sched2_use_superblocks) Optimization
1972 If scheduling post reload, do superblock scheduling
1976 Does nothing. Preserved for backward compatibility.
1979 Common Report Var(flag_schedule_insns) Optimization
1980 Reschedule instructions before register allocation
1983 Common Report Var(flag_schedule_insns_after_reload) Optimization
1984 Reschedule instructions after register allocation
1986 ; This flag should be on when a target implements non-trivial
1987 ; scheduling hooks, maybe saving some information for its own sake.
1988 ; On IA64, for example, this is used for correct bundling.
1989 fselective-scheduling
1990 Common Report Var(flag_selective_scheduling) Optimization
1991 Schedule instructions using selective scheduling algorithm
1993 fselective-scheduling2
1994 Common Report Var(flag_selective_scheduling2) Optimization
1995 Run selective scheduling after reload
1997 fsel-sched-pipelining
1998 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1999 Perform software pipelining of inner loops during selective scheduling
2001 fsel-sched-pipelining-outer-loops
2002 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
2003 Perform software pipelining of outer loops during selective scheduling
2005 fsel-sched-reschedule-pipelined
2006 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
2007 Reschedule pipelined regions without pipelining
2009 fsemantic-interposition
2010 Common Report Var(flag_semantic_interposition) Init(1)
2011 Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker
2013 ; sched_stalled_insns means that insns can be moved prematurely from the queue
2014 ; of stalled insns into the ready list.
2015 fsched-stalled-insns
2016 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
2017 Allow premature scheduling of queued insns
2019 fsched-stalled-insns=
2020 Common RejectNegative Joined UInteger Optimization
2021 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
2023 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
2024 ; be examined for a dependency on a stalled insn that is candidate for
2025 ; premature removal from the queue of stalled insns into the ready list (has
2026 ; an effect only if the flag 'sched_stalled_insns' is set).
2027 fsched-stalled-insns-dep
2028 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
2029 Set dependence distance checking in premature scheduling of queued insns
2031 fsched-stalled-insns-dep=
2032 Common RejectNegative Joined UInteger Optimization
2033 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
2035 fsched-group-heuristic
2036 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
2037 Enable the group heuristic in the scheduler
2039 fsched-critical-path-heuristic
2040 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
2041 Enable the critical path heuristic in the scheduler
2043 fsched-spec-insn-heuristic
2044 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
2045 Enable the speculative instruction heuristic in the scheduler
2047 fsched-rank-heuristic
2048 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
2049 Enable the rank heuristic in the scheduler
2051 fsched-last-insn-heuristic
2052 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
2053 Enable the last instruction heuristic in the scheduler
2055 fsched-dep-count-heuristic
2056 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
2057 Enable the dependent count heuristic in the scheduler
2060 Common Report Var(flag_section_anchors) Optimization
2061 Access data in the same section from shared anchor points
2065 Does nothing. Preserved for backward compatibility.
2069 Does nothing. Preserved for backward compatibility.
2072 Common Report Var(flag_ree) Init(0)
2073 Turn on Redundant Extensions Elimination pass.
2076 Common Report Var(flag_show_column) Init(1)
2077 Show column numbers in diagnostics, when available. Default on
2080 Common Report Var(flag_shrink_wrap) Optimization
2081 Emit function prologues only before parts of the function that need it,
2082 rather than at the top of the function.
2085 Common Report Var(flag_signaling_nans) Optimization SetByCombined
2086 Disable optimizations observable by IEEE signaling NaNs
2089 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
2090 Disable floating point optimizations that ignore the IEEE signedness of zero
2092 fsingle-precision-constant
2093 Common Report Var(flag_single_precision_constant) Optimization
2094 Convert floating point constants to single precision constants
2096 fsplit-ivs-in-unroller
2097 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
2098 Split lifetimes of induction variables when loops are unrolled
2101 Common Report Var(flag_split_stack) Init(-1)
2102 Generate discontiguous stack frames
2105 Common Report Var(flag_split_wide_types) Optimization
2106 Split wide types into independent registers
2109 Common Report Var(flag_ssa_phiopt) Optimization
2110 Optimize conditional patterns using SSA PHI nodes
2113 Common Report Var(flag_stdarg_opt) Init(1) Optimization
2114 Optimize amount of stdarg registers saved to stack at start of function
2116 fvariable-expansion-in-unroller
2117 Common Report Var(flag_variable_expansion_in_unroller) Optimization
2118 Apply variable expansion when loops are unrolled
2121 Common Report RejectNegative Joined
2122 -fstack-check=[no|generic|specific] Insert stack checking code into the program
2125 Common Alias(fstack-check=, specific, no)
2126 Insert stack checking code into the program. Same as -fstack-check=specific
2129 Common Var(common_deferred_options) Defer
2131 fstack-limit-register=
2132 Common RejectNegative Joined Var(common_deferred_options) Defer
2133 -fstack-limit-register=<register> Trap if the stack goes past <register>
2135 fstack-limit-symbol=
2136 Common RejectNegative Joined Var(common_deferred_options) Defer
2137 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
2140 Common Report Var(flag_stack_protect, 1) Init(-1)
2141 Use propolice as a stack protection method
2143 fstack-protector-all
2144 Common Report RejectNegative Var(flag_stack_protect, 2) Init(-1)
2145 Use a stack protection method for every function
2147 fstack-protector-strong
2148 Common Report RejectNegative Var(flag_stack_protect, 3) Init(-1)
2149 Use a smart stack protection method for certain functions
2151 fstack-protector-explicit
2152 Common Report RejectNegative Var(flag_stack_protect, 4)
2153 Use stack protection method only for functions with the stack_protect attribute
2156 Common RejectNegative Var(flag_stack_usage)
2157 Output stack usage information on a per-function basis
2161 Does nothing. Preserved for backward compatibility.
2163 ; Nonzero if we should do (language-dependent) alias analysis.
2164 ; Typically, this analysis will assume that expressions of certain
2165 ; types do not alias expressions of certain other types. Only used
2166 ; if alias analysis (in general) is enabled.
2168 Common Report Var(flag_strict_aliasing) Optimization
2169 Assume strict aliasing rules apply
2172 Common Report Var(flag_strict_overflow) Optimization
2173 Treat signed overflow as undefined
2176 Common Report Var(flag_sync_libcalls) Init(1)
2177 Implement __atomic operations via libcalls to legacy __sync functions
2180 Common Report Var(flag_syntax_only)
2181 Check for syntax errors, then stop
2184 Common Report Var(flag_test_coverage)
2185 Create data files needed by \"gcov\"
2188 Common Report Var(flag_thread_jumps) Optimization
2189 Perform jump threading optimizations
2192 Common Report Var(time_report)
2193 Report the time taken by each compiler pass
2196 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2197 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
2200 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2203 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2206 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2209 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2212 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2215 Common Report Var(flag_toplevel_reorder) Init(2)
2216 Reorder top level functions, variables, and asms
2219 Common Report Var(flag_tracer) Optimization
2220 Perform superblock formation via tail duplication
2222 ; Zero means that floating-point math operations cannot generate a
2223 ; (user-visible) trap. This is the case, for example, in nonstop
2224 ; IEEE 754 arithmetic.
2226 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2227 Assume floating-point operations can trap
2230 Common Report Var(flag_trapv) Optimization
2231 Trap for signed overflow in addition, subtraction and multiplication
2234 Common Report Var(flag_tree_ccp) Optimization
2235 Enable SSA-CCP optimization on trees
2238 Common Report Var(flag_tree_bit_ccp) Optimization
2239 Enable SSA-BIT-CCP optimization on trees
2243 Does nothing. Preserved for backward compatibility.
2246 Common Report Var(flag_tree_ch) Optimization
2247 Enable loop header copying on trees
2249 ftree-coalesce-inlined-vars
2250 Common Ignore RejectNegative
2251 Does nothing. Preserved for backward compatibility.
2254 Common Report Var(flag_tree_coalesce_vars) Optimization
2255 Enable SSA coalescing of user variables
2259 Does nothing. Preserved for backward compatibility.
2262 Common Report Var(flag_tree_copy_prop) Optimization
2263 Enable copy propagation on trees
2265 ftree-store-copy-prop
2267 Does nothing. Preserved for backward compatibility.
2270 Common Report Var(flag_tree_cselim) Init(2) Optimization
2271 Transform condition stores into unconditional ones
2273 ftree-switch-conversion
2274 Common Report Var(flag_tree_switch_conversion) Optimization
2275 Perform conversions of switch initializations.
2278 Common Report Var(flag_tree_dce) Optimization
2279 Enable SSA dead code elimination optimization on trees
2281 ftree-dominator-opts
2282 Common Report Var(flag_tree_dom) Optimization
2283 Enable dominator optimizations
2286 Common Report Var(flag_tree_tail_merge) Optimization
2287 Enable tail merging on trees
2290 Common Report Var(flag_tree_dse) Optimization
2291 Enable dead store elimination
2294 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2295 Enable forward propagation on trees
2298 Common Report Var(flag_tree_fre) Optimization
2299 Enable Full Redundancy Elimination (FRE) on trees
2302 Common Report Var(flag_optimize_strlen) Optimization
2303 Enable string length optimizations on trees
2305 fisolate-erroneous-paths-dereference
2306 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2307 Detect paths that trigger erroneous or undefined behavior due to
2308 dereferencing a null pointer. Isolate those paths from the main control
2309 flow and turn the statement with erroneous or undefined behavior into a trap.
2311 fisolate-erroneous-paths-attribute
2312 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2313 Detect paths that trigger erroneous or undefined behavior due a null value
2314 being used in a way forbidden by a returns_nonnull or nonnull
2315 attribute. Isolate those paths from the main control flow and turn the
2316 statement with erroneous or undefined behavior into a trap.
2318 ftree-loop-distribution
2319 Common Report Var(flag_tree_loop_distribution) Optimization
2320 Enable loop distribution on trees
2322 ftree-loop-distribute-patterns
2323 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2324 Enable loop distribution for patterns transformed into a library call
2327 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2328 Enable loop invariant motion on trees
2331 Common Alias(floop-nest-optimize)
2332 Enable loop nest transforms. Same as -floop-nest-optimize
2335 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2336 Create canonical induction variables in loops
2339 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2340 Enable loop optimizations on tree level
2342 ftree-parallelize-loops=
2343 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1) Optimization
2344 Enable automatic parallelization of loops
2347 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2348 Enable hoisting loads from conditional pointers.
2351 Common Report Var(flag_tree_pre) Optimization
2352 Enable SSA-PRE optimization on trees
2355 Common Report Var(flag_tree_partial_pre) Optimization
2356 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2359 Common Report Var(flag_tree_pta) Optimization
2360 Perform function-local points-to analysis on trees.
2363 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2364 Enable reassociation on tree level
2368 Does nothing. Preserved for backward compatibility.
2371 Common Report Var(flag_tree_sink) Optimization
2372 Enable SSA code sinking on trees
2375 Common Report Var(flag_tree_slsr) Optimization
2376 Perform straight-line strength reduction
2379 Common Report Var(flag_tree_sra) Optimization
2380 Perform scalar replacement of aggregates
2383 Common Report Var(flag_tree_ter) Optimization
2384 Replace temporary expressions in the SSA->normal pass
2387 Common Report Var(flag_tree_live_range_split) Optimization
2388 Perform live range splitting during the SSA->normal pass
2391 Common Report Var(flag_tree_vrp) Init(0) Optimization
2392 Perform Value Range Propagation on trees
2395 Common Report Var(flag_unit_at_a_time) Init(1)
2396 Compile whole compilation unit at a time
2399 Common Report Var(flag_unroll_loops) Optimization
2400 Perform loop unrolling when iteration count is known
2403 Common Report Var(flag_unroll_all_loops) Optimization
2404 Perform loop unrolling for all loops
2406 ; Nonzero means that loop optimizer may assume that the induction variables
2407 ; that control loops do not overflow and that the loops with nontrivial
2408 ; exit condition are not infinite
2409 funsafe-loop-optimizations
2410 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2411 Allow loop optimizations to assume that the loops behave in normal way
2414 Common Report Var(flag_associative_math) SetByCombined Optimization
2415 Allow optimization for floating-point arithmetic which may change the
2416 result of the operation due to rounding.
2419 Common Report Var(flag_reciprocal_math) SetByCombined Optimization
2420 Same as -fassociative-math for expressions which include division.
2422 ; Nonzero means that unsafe floating-point math optimizations are allowed
2423 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2424 ; are allowed to assume that their arguments and results are "normal"
2425 ; (e.g., nonnegative for SQRT).
2426 funsafe-math-optimizations
2427 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2428 Allow math optimizations that may violate IEEE or ISO standards
2431 Common Report Var(flag_unswitch_loops) Optimization
2432 Perform loop unswitching
2435 Common Report Var(flag_unwind_tables) Optimization
2436 Just generate unwind tables for exception handling
2439 Common Driver Negative(fuse-ld=gold)
2440 Use the bfd linker instead of the default linker
2443 Common Driver Negative(fuse-ld=bfd)
2444 Use the gold linker instead of the default linker
2447 Common Undocumented Var(flag_use_linker_plugin)
2449 ; Positive if we should track variables, negative if we should run
2450 ; the var-tracking pass only to discard debug annotations, zero if
2451 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2452 ; will be set according to optimize, debug_info_level and debug_hooks
2453 ; in process_options ().
2455 Common Report Var(flag_var_tracking) Init(2) Optimization
2456 Perform variable tracking
2458 ; Positive if we should track variables at assignments, negative if
2459 ; we should run the var-tracking pass only to discard debug
2460 ; annotations. When flag_var_tracking_assignments ==
2461 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2462 fvar-tracking-assignments
2463 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2464 Perform variable tracking by annotating assignments
2466 ; Nonzero if we should toggle flag_var_tracking_assignments after
2467 ; processing options and computing its default. */
2468 fvar-tracking-assignments-toggle
2469 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2470 Toggle -fvar-tracking-assignments
2472 ; Positive if we should track uninitialized variables, negative if
2473 ; we should run the var-tracking pass only to discard debug
2474 ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
2475 ; will be set according to flag_var_tracking.
2476 fvar-tracking-uninit
2477 Common Report Var(flag_var_tracking_uninit) Optimization
2478 Perform variable tracking and also tag variables that are uninitialized
2481 Common Report Var(flag_tree_vectorize) Optimization
2482 Enable vectorization on trees
2484 ftree-vectorizer-verbose=
2485 Common Joined RejectNegative Ignore
2486 Does nothing. Preserved for backward compatibility.
2488 ftree-loop-vectorize
2489 Common Report Var(flag_tree_loop_vectorize) Optimization
2490 Enable loop vectorization on trees
2493 Common Report Var(flag_tree_slp_vectorize) Optimization
2494 Enable basic block vectorization (SLP) on trees
2497 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT) Optimization
2498 Specifies the cost model for vectorization
2501 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED) Optimization
2502 Specifies the vectorization cost model for code marked with a simd directive
2505 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2508 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2511 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2514 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2517 Common RejectNegative Alias(fvect-cost-model=,dynamic)
2518 Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
2521 Common RejectNegative Alias(fvect-cost-model=,unlimited)
2522 Enables the unlimited vectorizer cost model. Preserved for backward compatibility.
2524 ftree-vect-loop-version
2526 Does nothing. Preserved for backward compatibility.
2529 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2530 Enable copy propagation of scalar-evolution information.
2532 ; -fverbose-asm causes extra commentary information to be produced in
2533 ; the generated assembly code (to make it more readable). This option
2534 ; is generally only of use to those who actually need to read the
2535 ; generated assembly code (perhaps while debugging the compiler itself).
2536 ; -fno-verbose-asm, the default, causes the extra information
2537 ; to not be added and is useful when comparing two assembler files.
2539 Common Report Var(flag_verbose_asm)
2540 Add extra commentary to assembler output
2543 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2544 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2547 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2550 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2553 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2556 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2559 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2562 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2563 Validate vtable pointers before using them.
2566 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2569 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2572 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2575 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2578 Common Var(flag_vtv_counts)
2579 Output vtable verification counters.
2582 Common Var(flag_vtv_debug)
2583 Output vtable verification pointer sets information.
2586 Common Report Var(flag_value_profile_transformations) Optimization
2587 Use expression value profiles in optimizations
2590 Common Report Var(flag_web) Init(2) Optimization
2591 Construct webs and split unrelated uses of single variable
2593 ftree-builtin-call-dce
2594 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2595 Enable conditional dead code elimination for builtin calls
2598 Common Report Var(flag_whole_program) Init(0)
2599 Perform whole program optimizations
2602 Common Report Var(flag_wrapv) Optimization
2603 Assume signed arithmetic overflow wraps around
2605 fzero-initialized-in-bss
2606 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2607 Put zero initialized data in the bss section
2610 Common JoinedOrMissing
2611 Generate debug information in default format
2614 Common JoinedOrMissing Negative(gdwarf)
2615 Generate debug information in COFF format
2618 Common JoinedOrMissing Negative(gdwarf-)
2619 Generate debug information in default version of DWARF format
2622 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2623 Generate debug information in DWARF v2 (or later) format
2626 Common JoinedOrMissing
2627 Generate debug information in default extended format
2630 Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2631 Don't generate DWARF pubnames and pubtypes sections.
2634 Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2635 Generate DWARF pubnames and pubtypes sections.
2638 Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2639 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2641 gno-record-gcc-switches
2642 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2643 Don't record gcc command line switches in DWARF DW_AT_producer.
2645 grecord-gcc-switches
2646 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2647 Record gcc command line switches in DWARF DW_AT_producer.
2650 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2651 Don't generate debug information in separate .dwo files
2654 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2655 Generate debug information in separate .dwo files
2658 Common JoinedOrMissing Negative(gstabs+)
2659 Generate debug information in STABS format
2662 Common JoinedOrMissing Negative(gvms)
2663 Generate debug information in extended STABS format
2666 Common RejectNegative Var(dwarf_strict,0) Init(0)
2667 Emit DWARF additions beyond selected version
2670 Common Report RejectNegative Var(dwarf_strict,1)
2671 Don't emit DWARF additions beyond selected version
2674 Common Report Var(flag_gtoggle)
2675 Toggle debug information generation
2678 Common JoinedOrMissing Negative(gxcoff)
2679 Generate debug information in VMS format
2682 Common JoinedOrMissing Negative(gxcoff+)
2683 Generate debug information in XCOFF format
2686 Common JoinedOrMissing Negative(gcoff)
2687 Generate debug information in extended XCOFF format
2690 Name(compressed_debug_sections) Type(int)
2692 ; Since -gz= is completely handled in specs, the values aren't used and we
2693 ; assign arbitrary constants.
2695 Enum(compressed_debug_sections) String(none) Value(0)
2698 Enum(compressed_debug_sections) String(zlib) Value(1)
2701 Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
2705 Generate compressed debug sections
2708 Common Driver Joined Enum(compressed_debug_sections)
2709 -gz=<format> Generate compressed debug sections in format <format>
2712 Driver Joined Separate
2715 Common Joined Var(plugindir_string) Init(0)
2716 -iplugindir=<dir> Set <dir> to be the default plugin directory
2719 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2720 -imultiarch <dir> Set <dir> to be the multiarch include subdirectory
2723 Driver Joined Separate
2728 no-canonical-prefixes
2741 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2742 -o <file> Place output into <file>
2745 Common Var(profile_flag)
2746 Enable function profiling
2749 Driver Var(pass_exit_codes)
2752 Common Alias(Wpedantic)
2755 Common Var(flag_pedantic_errors)
2756 Like -pedantic but issue them as errors
2762 Driver Var(use_pipes)
2765 Driver JoinedOrMissing Var(print_file_name)
2767 print-libgcc-file-name
2770 print-multi-directory
2771 Driver Var(print_multi_directory)
2774 Driver Var(print_multi_lib)
2776 print-multi-os-directory
2777 Driver Var(print_multi_os_directory)
2780 Driver Var(print_multiarch)
2783 Driver JoinedOrMissing Var(print_prog_name)
2786 Driver Var(print_search_dirs)
2789 Driver Var(print_sysroot)
2791 print-sysroot-headers-suffix
2792 Driver Var(print_sysroot_headers_suffix)
2795 Common Var(quiet_flag) RejectDriver
2796 Do not display functions compiled or elapsed time
2814 Driver Var(report_times)
2817 Driver JoinedOrMissing
2820 Driver Joined Separate
2824 ; C option, but driver must not handle as "-u ndef".
2827 Common Driver Var(verbose_flag)
2828 Enable verbose output
2831 Common Var(version_flag) RejectDriver
2832 Display the compiler's version
2835 Common Var(inhibit_warnings)
2839 Driver Separate Var(wrapper_string)
2842 Driver Joined Separate
2845 Driver RejectNegative Negative(pie)
2846 Create a shared library
2852 Driver Separate Alias(specs=)
2865 ; Documented for Fortran, but always accepted by driver.
2872 ; Documented for Go, but always accepted by driver.
2890 Driver RejectNegative Negative(shared)
2891 Don't create a position independent executable
2894 Driver RejectNegative Negative(no-pie)
2895 Create a position independent executable
2898 Driver Joined Separate
2901 Common Report Var(flag_ipa_ra) Optimization
2902 Use caller save register across calls if possible
2904 ; This comment is to ensure we retain the blank line above.