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 ; Enable additional checks of internal state consistency, which may slow
52 bool flag_checking = CHECKING_P
54 ; 0 means straightforward implementation of complex divide acceptable.
55 ; 1 means wide ranges of inputs must work for complex divide.
56 ; 2 means C99-like requirements for complex multiply and divide.
58 int flag_complex_method = 1
60 ; Nonzero if subexpressions must be evaluated from left-to-right.
62 int flag_evaluation_order = 0
64 ; Language specific warning pass for unused results.
66 bool flag_warn_unused_result = false
71 ; Nonzero if we should write GIMPLE bytecode for link-time optimization.
75 ; Nonzero if we should write GIMPLE bytecode for offload compilation.
77 int flag_generate_offload = 0
79 ; True to warn about any objects definitions whose size is larger
80 ; than N bytes. Also want about function definitions whose returned
81 ; values are larger than N bytes, where N is 'larger_than_size'.
86 HOST_WIDE_INT larger_than_size
88 ; True to warn about any function whose frame size is larger
91 bool warn_frame_larger_than
94 HOST_WIDE_INT frame_larger_than_size
96 ; Nonzero means we should be saving declaration info into a .X file.
98 int flag_gen_aux_info = 0
100 ; Nonzero if we are compiling code for a shared library, zero for
105 ; These two are really VEC(char_p,heap) *.
108 void *flag_instrument_functions_exclude_functions
111 void *flag_instrument_functions_exclude_files
113 ; Generic structs (e.g. templates not explicitly specialized)
114 ; may not have a compilation unit associated with them, and so
115 ; may need to be treated differently from ordinary structs.
117 ; Structs only handled by reference (indirectly), will also usually
118 ; not need as much debugging information.
121 enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
124 enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
126 ; True if we should exit after parsing options.
128 bool exit_after_options
130 ; Type(s) of debugging information we are producing (if any). See
131 ; flag-types.h for the definitions of the different possible types of
132 ; debugging information.
134 enum debug_info_type write_symbols = NO_DEBUG
136 ; Level of debugging information we are producing. See flag-types.h
137 ; for the definitions of the different possible levels.
139 enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
141 ; Nonzero means use GNU-only extensions in the generated symbolic
142 ; debugging information. Currently, this only has an effect when
143 ; write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG.
145 bool use_gnu_debug_info_extensions
147 ; Original value of maximum field alignment in bytes, specified via
148 ; -fpack-struct=<value>.
150 unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
152 ; Type of stack check.
154 enum stack_check_type flag_stack_check = NO_STACK_CHECK
156 ; True if stack usage information needs to be computed.
158 bool flag_stack_usage_info = false
160 ; -dA causes debug commentary information to be produced in
161 ; the generated assembly code (to make it more readable). This option
162 ; is generally only of use to those who actually need to read the
163 ; generated assembly code (perhaps while debugging the compiler itself).
164 ; Currently, this switch is only used by dwarf2out.c; however, it is intended
165 ; to be a catchall for printing debug information in the assembler file.
169 ; -dP causes the rtl to be emitted as a comment in assembly.
171 int flag_dump_rtl_in_asm
173 ; Whether -da was passed (used only in handle_common_deferred_options).
175 bool flag_dump_all_passed
177 ; Other flags saying which kinds of debugging dump have been requested.
180 int rtl_dump_and_exit
183 int flag_print_asm_name
185 ; Name of top-level original source file (what was input to cpp).
186 ; This comes from the #-command at the beginning of the actual input.
187 ; If there isn't any there, then this is the cc1 input file name.
189 const char *main_input_filename
191 ; Pointer to base name in main_input_filename, with directories and a
192 ; single final extension removed, and the length of this base
196 const char *main_input_basename
199 int main_input_baselength
201 ; Which options have been printed by --help.
205 ; Which enums have been printed by --help. 0 = not printed, no
206 ; relevant options seen, 1 = relevant option seen, not yet printed, 2
209 char *help_enum_printed
211 ; The number of columns for --help output.
213 unsigned int help_columns
215 ; Whether this options structure has been through finish_options
217 bool flag_opts_finished
219 ; What the sanitizer should instrument
221 unsigned int flag_sanitize
223 ; What sanitizers should recover from errors
225 unsigned int flag_sanitize_recover = SANITIZE_UNDEFINED | SANITIZE_NONDEFAULT | SANITIZE_KERNEL_ADDRESS
227 ; Flag whether a prefix has been added to dump_base_name
229 bool dump_base_name_prefixed = false
241 Driver Alias(coverage)
247 Common Separate Alias(d)
250 Common Joined Alias(d)
253 Common Separate Alias(dumpbase)
256 Common Separate Alias(dumpdir)
259 Driver Separate Alias(e)
262 Driver Joined Alias(e)
265 Common Warning Alias(Wextra)
268 Driver Separate Alias(Xassembler)
271 Driver JoinedOrMissing Alias(Xassembler)
274 Driver Separate Alias(Xlinker)
277 Driver JoinedOrMissing Alias(Xlinker)
280 Driver Separate Alias(u)
283 Driver Joined Alias(u)
286 Common Driver Var(help_flag)
287 Display this information
290 Common Driver Report Joined
291 --help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params
294 Driver Separate Alias(x)
297 Driver Joined Alias(x)
300 Driver Separate Alias(L)
303 Driver Joined Alias(L)
305 -no-canonical-prefixes
306 Driver Alias(no-canonical-prefixes)
308 -no-standard-libraries
309 Driver Alias(nostdlib)
312 Driver Var(no_sysroot_suffix)
321 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
324 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
327 Driver Alias(pass-exit-codes)
330 Common Alias(Wpedantic)
333 Common Alias(pedantic-errors)
342 Driver Separate Alias(B)
345 Driver JoinedOrMissing Alias(B)
351 Driver Separate Alias(print-file-name=)
354 Driver JoinedOrMissing Alias(print-file-name=)
356 -print-libgcc-file-name
357 Driver Alias(print-libgcc-file-name)
359 -print-multi-directory
360 Driver Alias(print-multi-directory)
363 Driver Alias(print-multi-lib)
365 -print-multi-os-directory
366 Driver Alias(print-multi-os-directory)
369 Driver Alias(print-multiarch)
372 Driver Separate Alias(print-prog-name=)
375 Driver JoinedOrMissing Alias(print-prog-name=)
378 Driver Alias(print-search-dirs)
381 Driver Alias(print-sysroot)
383 -print-sysroot-headers-suffix
384 Driver Alias(print-sysroot-headers-suffix)
390 Driver Alias(save-temps)
396 Driver Separate Alias(specs=)
399 Driver Joined Alias(specs=)
405 Driver Alias(symbolic)
409 Alias for --help=target
417 ;; The driver used to convert options such as --help into forms such
418 ;; as -fhelp; the following four entries are for compatibility with
419 ;; any direct uses of those (undocumented) -f forms
421 Common Driver Alias(-help)
424 Common Driver Joined Alias(-help=)
427 Common Driver Alias(-target-help)
430 Common Driver Alias(-version)
434 --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
437 Common Joined Alias(-param)
440 Driver Separate Alias(-sysroot=)
443 Driver JoinedOrMissing
449 Driver Joined Separate
455 Driver Joined Separate
461 Common JoinedOrMissing Optimization
462 -O<number> Set optimization level to <number>
466 Optimize for space rather than speed
470 Optimize for speed disregarding exact standards compliance
474 Optimize for debugging experience rather than speed or size
486 Driver Joined Separate
492 Driver Joined Separate
513 Common RejectNegative Warning Alias(Wextra)
514 This switch is deprecated; use -Wextra instead
517 Driver JoinedOrMissing
520 Driver JoinedOrMissing
523 Driver JoinedOrMissing
526 Common Var(warn_aggregate_return) Warning
527 Warn about returning structures, unions or arrays
529 Waggressive-loop-optimizations
530 Common Var(warn_aggressive_loop_optimizations) Init(1) Warning
531 Warn if a loop with constant number of iterations triggers undefined behavior
534 Common Var(warn_array_bounds) Warning
535 Warn if an array is accessed out of bounds
538 Common Joined RejectNegative UInteger Var(warn_array_bounds) Warning
539 Warn if an array is accessed out of bounds
542 Common Var(warn_attributes) Init(1) Warning
543 Warn about inappropriate attribute usage
546 Common Var(warn_cast_align) Warning
547 Warn about pointer casts which increase alignment
550 Common Var(warn_cpp) Init(1) Warning
551 Warn when a #warning directive is encountered
553 Wdeprecated-declarations
554 Common Var(warn_deprecated_decl) Init(1) Warning
555 Warn about uses of __attribute__((deprecated)) declarations
557 Wdisabled-optimization
558 Common Var(warn_disabled_optimization) Warning
559 Warn when an optimization pass is disabled
562 Common Var(warnings_are_errors)
563 Treat all warnings as errors
567 Treat specified warning as error
570 Common Var(extra_warnings) Warning
571 Print extra (possibly unwanted) warnings
574 Common Var(flag_fatal_errors)
575 Exit on the first error occurred
578 Common RejectNegative Joined UInteger
579 -Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
582 Common Var(warn_free_nonheap_object) Init(1) Warning
583 Warn when attempting to free a non-heap object
586 Common Var(warn_inline) Warning
587 Warn when an inlined function cannot be inlined
589 Winvalid-memory-model
590 Common Var(warn_invalid_memory_model) Init(1) Warning
591 Warn when an atomic memory model parameter is known to be outside the valid range.
594 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
597 Common RejectNegative Joined UInteger Warning
598 -Wlarger-than=<number> Warn if an object is larger than <number> bytes
601 Common Var(warn_null_dereference) Warning
602 Warn if dereferencing a NULL pointer may lead to erroneous or undefined behavior
604 Wunsafe-loop-optimizations
605 Common Var(warn_unsafe_loop_optimizations) Warning
606 Warn if the loop cannot be optimized due to nontrivial assumptions.
609 Common Alias(Wsuggest-attribute=noreturn)
612 Common Var(warn_odr_violations) Init(1) Warning
613 Warn about some C++ One Definition Rule violations during link time optimization
616 Common Var(warn_overflow) Init(1) Warning
617 Warn about overflow in arithmetic expressions
620 Common Var(warn_lto_type_mismatch) Init(1) Warning
621 During link time optimization warn about mismatched types of global declarations
624 Common Var(warn_packed) Warning
625 Warn when the packed attribute has no effect on struct layout
628 Common Var(warn_padded) Warning
629 Warn when padding is required to align structure members
632 Common Var(pedantic) Init(0) Warning
633 Issue warnings needed for strict compliance to the standard
636 Common Var(warn_return_local_addr) Init(1) Warning
637 Warn about returning a pointer/reference to a local or temporary variable.
640 Common Var(warn_shadow) Warning
641 Warn when one local variable shadows another
644 Common Var(warn_stack_protect) Warning
645 Warn when not issuing stack smashing protection for some reason
648 Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
649 Warn if stack usage might be larger than specified amount
653 Warn about code which might break strict aliasing rules
656 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
657 Warn about code which might break strict aliasing rules
661 Warn about optimizations that assume that signed overflow is undefined
664 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
665 Warn about optimizations that assume that signed overflow is undefined
667 Wsuggest-attribute=const
668 Common Var(warn_suggest_attribute_const) Warning
669 Warn about functions which might be candidates for __attribute__((const))
671 Wsuggest-attribute=pure
672 Common Var(warn_suggest_attribute_pure) Warning
673 Warn about functions which might be candidates for __attribute__((pure))
675 Wsuggest-attribute=noreturn
676 Common Var(warn_suggest_attribute_noreturn) Warning
677 Warn about functions which might be candidates for __attribute__((noreturn))
680 Common Var(warn_suggest_final_types) Warning
681 Warn about C++ polymorphic types where adding final keyword would improve code quality
683 Wsuggest-final-methods
684 Common Var(warn_suggest_final_methods) Warning
685 Warn about C++ virtual methods where adding final keyword would improve code quality
688 Common Var(warn_system_headers) Warning
689 Do not suppress warnings from system headers
692 Common Var(warn_trampolines) Warning
693 Warn whenever a trampoline is generated
696 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
697 Warn if a comparison is always true or always false due to the limited range of the data type
700 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
701 Warn about uninitialized automatic variables
704 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
705 Warn about maybe uninitialized automatic variables
709 Does nothing. Preserved for backward compatibility.
712 Common Var(warn_unused) Init(0) Warning
713 Enable all -Wunused- warnings
715 Wunused-but-set-parameter
716 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
717 Warn when a function parameter is only set, otherwise unused
719 Wunused-but-set-variable
720 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
721 Warn when a variable is only set, otherwise unused
724 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
725 Warn when a function is unused
728 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
729 Warn when a label is unused
732 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
733 Warn when a function parameter is unused
736 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
737 Warn when an expression value is unused
740 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
741 Warn when a variable is unused
744 Common Var(warn_coverage_mismatch) Init(1) Warning
745 Warn in case profiles in -fprofile-use do not match
747 Wvector-operation-performance
748 Common Var(warn_vector_operation_performance) Warning
749 Warn when a vector operation is compiled outside the SIMD
764 Common Separate Var(aux_info_file_name)
765 -aux-info <file> Emit declaration information into <file>
768 Common Joined Alias(aux-info)
771 Common Separate RejectDriver Var(aux_base_name)
774 Common Separate RejectDriver
784 -d<letters> Enable dumps from specific passes of the compiler
787 Common Separate Var(dump_base_name)
788 -dumpbase <file> Set the file basename to be used for dumps
791 Common Separate Var(dump_dir_name)
792 -dumpdir <dir> Set the directory name to be used for dumps
804 Driver Joined Separate
806 ; This option has historically been passed down to the linker by an
807 ; accident of a %{e*} spec, so ensure it continues to be passed down
808 ; as a single option. The supported option for this purpose is
809 ; -rdynamic. See PR 47390.
813 ; The version of the C++ ABI in use. The following values are allowed:
815 ; 0: The version of the ABI believed most conformant with the C++ ABI
816 ; specification. This ABI may change as bugs are discovered and fixed.
817 ; Therefore, 0 will not necessarily indicate the same ABI in different
820 ; 1: The version of the ABI first used in G++ 3.2. No longer selectable.
822 ; 2: The version of the ABI first used in G++ 3.4, and the default
825 ; 3: The version of the ABI that fixes the missing underscore
826 ; in template non-type arguments of pointer type.
828 ; 4: The version of the ABI that introduces unambiguous mangling of
829 ; vector types. First selectable in G++ 4.5.
831 ; 5: The version of the ABI that ignores attribute const/noreturn
832 ; in function pointer mangling, and corrects mangling of decltype and
833 ; function parameters used in other parameters and the return type.
834 ; First selectable in G++ 4.6.
836 ; 6: The version of the ABI that doesn't promote scoped enums to int and
837 ; changes the mangling of template argument packs, const/static_cast,
838 ; prefix ++ and --, and a class scope function used as a template
840 ; First selectable in G++ 4.7.
842 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
843 ; corrects the mangling of lambdas in default argument scope.
844 ; First selectable in G++ 4.8.
846 ; 8: The version of the ABI that corrects the substitution behavior of
847 ; function types with function-cv-qualifiers.
848 ; First selectable in G++ 4.9 and default in G++ 5.
850 ; 9: The version of the ABI that corrects the alignment of nullptr_t.
851 ; First selectable and default in G++ 5.2.
853 ; 10: The version of the ABI that mangles attributes that affect type
854 ; identity, such as ia32 calling convention attributes (stdcall, etc.)
855 ; Default in G++ 6 (set in c_common_post_options).
857 ; Additional positive integers will be assigned as new versions of
858 ; the ABI become the default version of the ABI.
860 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(0)
861 The version of the C++ ABI in use
863 faggressive-loop-optimizations
864 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
865 Aggressively optimize loops using language constraints
868 Common Report Var(align_functions,0) Optimization UInteger
869 Align the start of functions
872 Common RejectNegative Joined UInteger Var(align_functions)
875 Common Report Var(align_jumps,0) Optimization UInteger
876 Align labels which are only reached by jumping
879 Common RejectNegative Joined UInteger Var(align_jumps)
882 Common Report Var(align_labels,0) Optimization UInteger
886 Common RejectNegative Joined UInteger Var(align_labels)
889 Common Report Var(align_loops,0) Optimization UInteger
890 Align the start of loops
893 Common RejectNegative Joined UInteger Var(align_loops)
897 Does nothing. Preserved for backward compatibility.
901 Does nothing. Preserved for backward compatibility.
903 fargument-noalias-global
905 Does nothing. Preserved for backward compatibility.
907 fargument-noalias-anything
909 Does nothing. Preserved for backward compatibility.
912 Common Driver Report Joined
913 Select what to sanitize
916 Common Joined RejectNegative Var(common_deferred_options) Defer
917 -fasan-shadow-offset=<number> Use custom shadow memory offset.
920 Common Joined RejectNegative Var(common_deferred_options) Defer
921 -fsanitize-sections=<sec1,sec2,...> Sanitize global variables
922 in user-defined sections.
926 After diagnosing undefined behavior attempt to continue execution
930 This switch is deprecated; use -fsanitize-recover= instead
932 fsanitize-undefined-trap-on-error
933 Common Driver Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
934 Use trap instead of a library function for undefined behavior sanitization
936 fasynchronous-unwind-tables
937 Common Report Var(flag_asynchronous_unwind_tables) Optimization
938 Generate unwind tables that are exact at each instruction boundary
941 Common Report Var(flag_auto_inc_dec) Init(1) Optimization
942 Generate auto-inc/dec instructions
945 Common Report Var(flag_auto_profile)
946 Use sample profile information for call graph node weights. The default
947 profile file is fbdata.afdo in 'pwd'.
950 Common Joined RejectNegative Var(auto_profile_file)
951 Use sample profile information for call graph node weights. The profile
952 file is specified in the argument.
954 ; -fcheck-bounds causes gcc to generate array bounds checks.
955 ; For C, C++ and ObjC: defaults off.
956 ; For Java: defaults to on.
957 ; For Fortran: defaults to off.
959 Common Report Var(flag_bounds_check)
960 Generate code to check bounds before indexing arrays
963 Common Report Var(flag_branch_on_count_reg) Optimization
964 Replace add, compare, branch with branch on count register
966 fbranch-probabilities
967 Common Report Var(flag_branch_probabilities) Optimization
968 Use profiling information for branch probabilities
970 fbranch-target-load-optimize
971 Common Report Var(flag_branch_target_load_optimize) Optimization
972 Perform branch target load optimization before prologue / epilogue threading
974 fbranch-target-load-optimize2
975 Common Report Var(flag_branch_target_load_optimize2) Optimization
976 Perform branch target load optimization after prologue / epilogue threading
979 Common Report Var(flag_btr_bb_exclusive) Optimization
980 Restrict target load migration not to re-use registers in any basic block
983 Common Joined RejectNegative Var(common_deferred_options) Defer
984 -fcall-saved-<register> Mark <register> as being preserved across functions
987 Common Joined RejectNegative Var(common_deferred_options) Defer
988 -fcall-used-<register> Mark <register> as being corrupted by function calls
990 ; Nonzero for -fcaller-saves: allocate values in regs that need to
991 ; be saved across function calls, if that produces overall better code.
992 ; Optional now, so people can test it.
994 Common Report Var(flag_caller_saves) Optimization
995 Save registers around function calls
998 Common Report Var(flag_check_data_deps)
999 This switch is deprecated; do not use.
1002 Common Var(flag_check_new)
1003 Check the return value of new in C++
1005 fcombine-stack-adjustments
1006 Common Report Var(flag_combine_stack_adjustments) Optimization
1007 Looks for opportunities to reduce stack adjustments and stack references.
1010 Common Report Var(flag_no_common,0)
1011 Do not put uninitialized globals in the common section
1015 ; Converted by the driver to -fcompare-debug= options.
1018 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
1019 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
1021 fcompare-debug-second
1022 Common Driver RejectNegative Var(flag_compare_debug)
1023 Run only the second compilation of -fcompare-debug
1026 Common Report Var(flag_compare_elim_after_reload) Optimization
1027 Perform comparison elimination after register allocation has finished
1030 Common Var(flag_conserve_stack) Optimization
1031 Do not perform optimizations increasing noticeably stack usage
1034 Common Report Var(flag_cprop_registers) Optimization
1035 Perform a register copy-propagation optimization pass
1038 Common Report Var(flag_crossjumping) Optimization
1039 Perform cross-jumping optimization
1042 Common Report Var(flag_cse_follow_jumps) Optimization
1043 When running CSE, follow jumps to their targets
1047 Does nothing. Preserved for backward compatibility.
1050 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
1051 Omit range reduction step when performing complex division
1054 Common Report Var(flag_cx_fortran_rules) Optimization
1055 Complex multiplication and division follow Fortran rules
1058 Common Report Var(flag_data_sections)
1059 Place data items into their own section
1062 Common Report Var(common_deferred_options) Defer
1063 List all available debugging counters with their limits and counts.
1066 Common RejectNegative Joined Var(common_deferred_options) Defer
1067 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
1070 Common Joined RejectNegative Var(common_deferred_options) Defer
1071 Map one directory name to another in debug information
1073 fdebug-types-section
1074 Common Report Var(flag_debug_types_section) Init(0)
1075 Output .debug_types section when using DWARF v4 debuginfo.
1077 ; Nonzero for -fdefer-pop: don't pop args after each function call
1078 ; instead save them up to pop many calls' args with one insns.
1080 Common Report Var(flag_defer_pop) Optimization
1081 Defer popping functions args from stack until later
1084 Common Report Var(flag_delayed_branch) Optimization
1085 Attempt to fill delay slots of branch instructions
1087 fdelete-dead-exceptions
1088 Common Report Var(flag_delete_dead_exceptions) Init(0) Optimization
1089 Delete dead instructions that may throw exceptions
1091 fdelete-null-pointer-checks
1092 Common Report Var(flag_delete_null_pointer_checks) Init(-1) Optimization
1093 Delete useless null pointer checks
1095 fdevirtualize-at-ltrans
1096 Common Report Var(flag_ltrans_devirtualize)
1097 Stream extra data to support more aggressive devirtualization in LTO local transformation mode
1099 fdevirtualize-speculatively
1100 Common Report Var(flag_devirtualize_speculatively) Optimization
1101 Perform speculative devirtualization
1104 Common Report Var(flag_devirtualize) Optimization
1105 Try to convert virtual calls to direct ones.
1107 fdiagnostics-show-location=
1108 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1109 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
1111 ; Required for these enum values.
1116 Name(diagnostic_prefixing_rule) Type(int)
1119 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1122 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1124 fdiagnostics-show-caret
1125 Common Var(flag_diagnostics_show_caret) Init(1)
1126 Show the source line with a caret indicating the column
1129 Common Alias(fdiagnostics-color=,always,never)
1133 Driver Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1134 -fdiagnostics-color=[never|always|auto] Colorize diagnostics
1136 ; Required for these enum values.
1141 Name(diagnostic_color_rule) Type(int)
1144 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1147 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1150 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1152 fdiagnostics-show-option
1153 Common Var(flag_diagnostics_show_option) Init(1)
1154 Amend appropriate diagnostic messages with the command line option that controls them
1157 Common Joined RejectNegative Var(common_deferred_options) Defer
1158 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1161 Common Joined RejectNegative Var(common_deferred_options) Defer
1162 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1165 Common Joined RejectNegative Var(common_deferred_options) Defer
1166 -fdump-<type> Dump various compiler internals to a file
1169 Driver RejectNegative
1172 Common RejectNegative Joined Var(flag_dump_final_insns)
1173 -fdump-final-insns=filename Dump to filename the insns at the end of translation
1176 Common RejectNegative Joined Var(flag_dump_go_spec)
1177 -fdump-go-spec=filename Write all declarations to file as Go code
1180 Common Report Var(flag_dump_noaddr)
1181 Suppress output of addresses in debugging dumps
1184 Common Driver Var(flag_report_bug)
1185 Collect and dump debug information into temporary file if ICE in C/C++
1188 fdump-internal-locations
1189 Common Var(flag_dump_locations) Init(0)
1190 Dump detailed information on GCC's internal representation of source code locations
1193 Common Var(flag_dump_passes) Init(0)
1194 Dump optimization passes
1197 Common Report Var(flag_dump_unnumbered)
1198 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1200 fdump-unnumbered-links
1201 Common Report Var(flag_dump_unnumbered_links)
1202 Suppress output of previous and next insn numbers in debugging dumps
1205 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1206 Enable CFI tables via GAS assembler directives.
1209 Common Report Var(flag_early_inlining) Init(1) Optimization
1210 Perform early inlining
1212 feliminate-dwarf2-dups
1213 Common Report Var(flag_eliminate_dwarf2_dups)
1214 Perform DWARF2 duplicate elimination
1217 Common Report Var(flag_ipa_sra) Init(0) Optimization
1218 Perform interprocedural reduction of aggregates
1220 feliminate-unused-debug-symbols
1221 Common Report Var(flag_debug_only_used_symbols)
1222 Perform unused symbol elimination in debug info
1224 feliminate-unused-debug-types
1225 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1226 Perform unused type elimination in debug info
1228 femit-class-debug-always
1229 Common Report Var(flag_emit_class_debug_always) Init(0)
1230 Do not suppress C++ class debug information.
1233 Common Report Var(flag_exceptions) Optimization
1234 Enable exception handling
1236 fexpensive-optimizations
1237 Common Report Var(flag_expensive_optimizations) Optimization
1238 Perform a number of minor, expensive optimizations
1241 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1242 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1245 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1248 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1251 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1257 Common Var(flag_fat_lto_objects)
1258 Output lto objects containing both the intermediate language and binary output.
1261 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1262 Assume no NaNs or infinities are generated
1265 Common Joined RejectNegative Var(common_deferred_options) Defer
1266 -ffixed-<register> Mark <register> as being unavailable to the compiler
1269 Common Report Var(flag_float_store) Optimization
1270 Don't allocate floats and doubles in extended-precision registers
1274 Does nothing. Preserved for backward compatibility.
1277 Common Report Var(flag_forward_propagate) Optimization
1278 Perform a forward propagation pass on RTL
1281 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST) Optimization
1282 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1285 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1288 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1290 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1292 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1295 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1297 ; Nonzero means don't put addresses of constant functions in registers.
1298 ; Used for compiling the Unix kernel, where strange substitutions are
1299 ; done on the assembly output.
1301 Common Report Var(flag_no_function_cse,0) Optimization
1302 Allow function addresses to be held in registers
1305 Common Report Var(flag_function_sections)
1306 Place each function into its own section
1309 Common Report Var(flag_gcse) Optimization
1310 Perform global common subexpression elimination
1313 Common Report Var(flag_gcse_lm) Init(1) Optimization
1314 Perform enhanced load motion during global common subexpression elimination
1317 Common Report Var(flag_gcse_sm) Init(0) Optimization
1318 Perform store motion after global common subexpression elimination
1321 Common Report Var(flag_gcse_las) Init(0) Optimization
1322 Perform redundant load after store elimination in global common subexpression
1326 Common Report Var(flag_gcse_after_reload) Optimization
1327 Perform global common subexpression elimination after register allocation
1330 ; This option is not documented yet as its semantics will change.
1332 Common Report Var(flag_graphite) Optimization
1333 Enable in and out of Graphite representation
1336 Common Report Var(flag_graphite_identity) Optimization
1337 Enable Graphite Identity transformation
1339 fhoist-adjacent-loads
1340 Common Report Var(flag_hoist_adjacent_loads) Optimization
1341 Enable hoisting adjacent loads to encourage generating conditional move
1344 floop-parallelize-all
1345 Common Report Var(flag_loop_parallelize_all) Optimization
1346 Mark all loops as parallel
1349 Common Alias(floop-nest-optimize)
1350 Enable loop nest transforms. Same as -floop-nest-optimize
1353 Common Alias(floop-nest-optimize)
1354 Enable loop nest transforms. Same as -floop-nest-optimize
1357 Common Alias(floop-nest-optimize)
1358 Enable loop nest transforms. Same as -floop-nest-optimize
1360 floop-unroll-and-jam
1361 Common Alias(floop-nest-optimize)
1362 Enable loop nest transforms. Same as -floop-nest-optimize
1365 Common Report Var(flag_tm)
1366 Enable support for GNU transactional memory
1369 Common Report Var(flag_gnu_unique) Init(1)
1370 Use STB_GNU_UNIQUE if supported by the assembler
1374 Does nothing. Preserved for backward compatibility.
1377 Common Report Var(flag_loop_optimize_isl) Optimization
1378 Enable the ISL based loop nest optimizer
1380 fstrict-volatile-bitfields
1381 Common Report Var(flag_strict_volatile_bitfields) Init(-1) Optimization
1382 Force bitfield accesses to match their type width
1384 fguess-branch-probability
1385 Common Report Var(flag_guess_branch_prob) Optimization
1386 Enable guessing of branch probabilities
1388 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1389 ; Generate position-independent code for executables if possible
1390 ; On SVR4 targets, it also controls whether or not to emit a
1391 ; string identifying the compiler.
1393 Common Report Var(flag_no_ident,0)
1394 Process #ident directives
1397 Common Report Var(flag_if_conversion) Optimization
1398 Perform conversion of conditional jumps to branchless equivalents
1401 Common Report Var(flag_if_conversion2) Optimization
1402 Perform conversion of conditional jumps to conditional execution
1405 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL) Optimization
1406 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1409 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1412 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1415 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1418 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1420 ftree-loop-if-convert
1421 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1422 Convert conditional jumps in innermost loops to branchless equivalents
1424 ftree-loop-if-convert-stores
1425 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1426 Also if-convert conditional jumps containing memory writes
1428 ; -finhibit-size-directive inhibits output of .size for ELF.
1429 ; This is used only for compiling crtstuff.c,
1430 ; and it may be extended to other effects
1431 ; needed for crtstuff.c on other systems.
1432 finhibit-size-directive
1433 Common Report Var(flag_inhibit_size_directive)
1434 Do not generate .size directives
1437 Common Report Var(flag_indirect_inlining) Optimization
1438 Perform indirect inlining
1440 ; General flag to enable inlining. Specifying -fno-inline will disable
1441 ; all inlining apart from always-inline functions.
1443 Common Report Var(flag_no_inline,0) Init(0) Optimization
1444 Enable inlining of function declared \"inline\", disabling disables all inlining
1446 finline-small-functions
1447 Common Report Var(flag_inline_small_functions) Optimization
1448 Integrate functions into their callers when code size is known not to grow
1451 Common Report Var(flag_inline_functions) Optimization
1452 Integrate functions not declared \"inline\" into their callers when profitable
1454 finline-functions-called-once
1455 Common Report Var(flag_inline_functions_called_once) Optimization
1456 Integrate functions only required by their single caller
1459 Common RejectNegative Joined Alias(finline-limit=)
1462 Common RejectNegative Joined UInteger
1463 -finline-limit=<number> Limit the size of inlined functions to <number>
1466 Common Report Var(flag_inline_atomics) Init(1) Optimization
1467 Inline __atomic operations when a lock free instruction sequence is available.
1469 finstrument-functions
1470 Common Report Var(flag_instrument_function_entry_exit)
1471 Instrument function entry and exit with profiling calls
1473 finstrument-functions-exclude-function-list=
1474 Common RejectNegative Joined
1475 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1477 finstrument-functions-exclude-file-list=
1478 Common RejectNegative Joined
1479 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1482 Common Report Var(flag_ipa_cp) Optimization
1483 Perform interprocedural constant propagation
1486 Common Report Var(flag_ipa_cp_clone) Optimization
1487 Perform cloning to make Interprocedural constant propagation stronger
1490 Common Report Var(flag_ipa_cp_alignment) Optimization
1491 Perform alignment discovery and propagation to make Interprocedural constant propagation stronger
1494 Common Report Var(flag_ipa_profile) Init(0) Optimization
1495 Perform interprocedural profile propagation
1498 Common Report Var(flag_ipa_pta) Init(0) Optimization
1499 Perform interprocedural points-to analysis
1502 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1503 Discover pure and const functions
1506 Common Report Var(flag_ipa_icf) Optimization
1507 Perform Identical Code Folding for functions and read-only variables
1510 Common Report Var(flag_ipa_icf_functions) Optimization
1511 Perform Identical Code Folding for functions
1514 Common Report Var(flag_ipa_icf_variables)
1515 Perform Identical Code Folding for variables
1518 Common Report Var(flag_ipa_reference) Init(0) Optimization
1519 Discover readonly and non addressable static variables
1523 Does nothing. Preserved for backward compatibility.
1527 Does nothing. Preserved for backward compatibility.
1530 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB) Optimization
1531 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1534 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1537 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1540 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1543 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT) Optimization
1544 -fira-region=[one|all|mixed] Set regions for IRA
1547 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1550 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1553 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1556 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1559 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1560 Use IRA based register pressure calculation
1561 in RTL hoist optimizations.
1564 Common Report Var(flag_ira_loop_pressure) Optimization
1565 Use IRA based register pressure calculation
1566 in RTL loop optimizations.
1568 fira-share-save-slots
1569 Common Report Var(flag_ira_share_save_slots) Init(1) Optimization
1570 Share slots for saving different hard registers.
1572 fira-share-spill-slots
1573 Common Report Var(flag_ira_share_spill_slots) Init(1) Optimization
1574 Share stack slots for spilled pseudo-registers.
1577 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1578 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1581 Common Report Var(flag_ivopts) Init(1) Optimization
1582 Optimize induction variables on trees
1585 Common Var(flag_jump_tables) Init(1) Optimization
1586 Use jump tables for sufficiently large switch statements
1588 fkeep-inline-functions
1589 Common Report Var(flag_keep_inline_functions)
1590 Generate code for functions even if they are fully inlined
1593 Common Report Var(flag_keep_static_consts) Init(1)
1594 Emit static const variables even if they are not used
1597 Common Report Var(flag_leading_underscore) Init(-1)
1598 Give external symbols a leading underscore
1602 Does nothing. Preserved for backward compatibility.
1605 Common Report Var(flag_lra_remat) Optimization
1606 Do CFG-sensitive rematerialization in LRA
1610 Enable link-time optimization.
1613 Common RejectNegative Joined Var(flag_lto)
1614 Link-time optimization with number of parallel jobs or jobserver.
1617 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1620 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1623 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1626 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1629 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1632 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1635 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1636 Specify the algorithm to partition symbols and vars at linktime
1638 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1639 flto-compression-level=
1640 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1641 -flto-compression-level=<number> Use zlib compression level <number> for IL
1643 flto-odr-type-merging
1644 Common Report Var(flag_lto_odr_type_mering) Init(1)
1645 Merge C++ types using One Definition Rule
1648 Common Report Var(flag_lto_report) Init(0)
1649 Report various link-time optimization statistics
1652 Common Report Var(flag_lto_report_wpa) Init(0)
1653 Report various link-time optimization statistics for WPA only
1656 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1657 Set errno after built-in math functions
1660 Common Joined RejectNegative UInteger Var(flag_max_errors)
1661 -fmax-errors=<number> Maximum number of errors to report
1664 Common Report Var(mem_report)
1665 Report on permanent memory allocation
1668 Common Report Var(mem_report_wpa)
1669 Report on permanent memory allocation in WPA only
1671 ; This will attempt to merge constant section constants, if 1 only
1672 ; string constants and constants from constant pool, if 2 also constant
1674 fmerge-all-constants
1675 Common Report Var(flag_merge_constants,2) Init(1)
1676 Attempt to merge identical constants and constant variables
1679 Common Report Var(flag_merge_constants,1)
1680 Attempt to merge identical constants across compilation units
1682 fmerge-debug-strings
1683 Common Report Var(flag_merge_debug_strings) Init(1)
1684 Attempt to merge identical debug strings across compilation units
1687 Common RejectNegative Joined UInteger
1688 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1691 Common Report Var(flag_modulo_sched) Optimization
1692 Perform SMS based modulo scheduling before the first scheduling pass
1694 fmodulo-sched-allow-regmoves
1695 Common Report Var(flag_modulo_sched_allow_regmoves) Optimization
1696 Perform SMS based modulo scheduling with register moves allowed
1698 fmove-loop-invariants
1699 Common Report Var(flag_move_loop_invariants) Optimization
1700 Move loop invariant computations out of loops
1703 Common Var(flag_dce) Init(1) Optimization
1704 Use the RTL dead code elimination pass
1707 Common Var(flag_dse) Init(1) Optimization
1708 Use the RTL dead store elimination pass
1710 freschedule-modulo-scheduled-loops
1711 Common Report Var(flag_resched_modulo_sched) Optimization
1712 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1714 fnon-call-exceptions
1715 Common Report Var(flag_non_call_exceptions) Optimization
1716 Support synchronous non-call exceptions
1719 Common Driver Joined MissingArgError(options or targets missing after %qs)
1720 -foffload=<targets>=<options> Specify offloading targets and options for them
1723 Common Joined RejectNegative Enum(offload_abi) Var(flag_offload_abi) Init(OFFLOAD_ABI_UNSET)
1724 -foffload-abi=[lp64|ilp32] Set the ABI to use in an offload compiler
1727 Name(offload_abi) Type(enum offload_abi) UnknownError(unknown offload ABI %qs)
1730 Enum(offload_abi) String(ilp32) Value(OFFLOAD_ABI_ILP32)
1733 Enum(offload_abi) String(lp64) Value(OFFLOAD_ABI_LP64)
1736 Common Report Var(flag_omit_frame_pointer) Optimization
1737 When possible do not generate stack frames
1740 Common Report Var(flag_opt_info) Optimization
1741 Enable all optimization info dumps on stderr
1744 Common Joined RejectNegative Var(common_deferred_options) Defer
1745 -fopt-info[-<type>=filename] Dump compiler optimization details
1747 foptimize-register-move
1749 Does nothing. Preserved for backward compatibility.
1751 foptimize-sibling-calls
1752 Common Report Var(flag_optimize_sibling_calls) Optimization
1753 Optimize sibling and tail recursive calls
1756 Common Report Var(flag_partial_inlining) Optimization
1757 Perform partial inlining
1760 Common Report Var(pre_ipa_mem_report)
1761 Report on memory allocation before interprocedural optimization
1763 fpost-ipa-mem-report
1764 Common Report Var(post_ipa_mem_report)
1765 Report on memory allocation before interprocedural optimization
1768 Common Report Var(flag_pack_struct) Optimization
1769 Pack structure members together without holes
1772 Common RejectNegative Joined UInteger Optimization
1773 -fpack-struct=<number> Set initial maximum structure member alignment
1776 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1777 Return small aggregates in memory, not registers
1780 Common Report Var(flag_peel_loops) Optimization
1781 Perform loop peeling
1784 Common Report Var(flag_no_peephole,0) Optimization
1785 Enable machine specific peephole optimizations
1788 Common Report Var(flag_peephole2) Optimization
1789 Enable an RTL peephole pass before sched2
1792 Common Report Var(flag_pic,2) Negative(fPIE)
1793 Generate position-independent code if possible (large mode)
1796 Common Report Var(flag_pie,2) Negative(fpic) Init(-1)
1797 Generate position-independent code for executables if possible (large mode)
1800 Common Report Var(flag_pic,1) Negative(fpie)
1801 Generate position-independent code if possible (small mode)
1804 Common Report Var(flag_pie,1) Negative(fPIC) Init(-1)
1805 Generate position-independent code for executables if possible (small mode)
1808 Common Report Var(flag_plt) Init(1) Optimization
1809 Use PLT for PIC calls (-fno-plt: load the address from GOT at call site)
1812 Common Joined RejectNegative Var(common_deferred_options) Defer
1813 Specify a plugin to load
1816 Common Joined RejectNegative Var(common_deferred_options) Defer
1817 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1819 fpredictive-commoning
1820 Common Report Var(flag_predictive_commoning) Optimization
1821 Run predictive commoning optimization.
1823 fprefetch-loop-arrays
1824 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1825 Generate prefetch instructions, if available, for arrays in loops
1828 Common Report Var(profile_flag)
1829 Enable basic program profiling code
1832 Common Report Var(profile_arc_flag)
1833 Insert arc-based program profiling code
1836 Common Joined RejectNegative Var(profile_data_prefix)
1837 Set the top-level directory for storing the profile data.
1838 The default is 'pwd'.
1841 Common Report Var(flag_profile_correction)
1842 Enable correction of flow inconsistent profile data input
1846 Enable common options for generating profile info for profile feedback directed optimizations
1849 Common Joined RejectNegative
1850 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1853 Common Var(flag_profile_use)
1854 Enable common options for performing profile feedback directed optimizations
1857 Common Joined RejectNegative
1858 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1861 Common Report Var(flag_profile_values)
1862 Insert code to profile values of expressions
1865 Common Report Var(profile_report)
1866 Report on consistency of profile
1868 fprofile-reorder-functions
1869 Common Report Var(flag_profile_reorder_functions)
1870 Enable function reordering that improves code placement
1873 Common Var(common_deferred_options) Defer
1876 Common Joined RejectNegative Var(common_deferred_options) Defer
1877 -frandom-seed=<number> Make compile reproducible using <number>
1879 ; This switch causes the command line that was used to create an
1880 ; object file to be recorded into the object file. The exact format
1881 ; of this recording is target and binary file format dependent.
1882 ; It is related to the -fverbose-asm switch, but that switch only
1883 ; records information in the assembler output file as comments, so
1884 ; they never reach the object file.
1885 frecord-gcc-switches
1886 Common Report Var(flag_record_gcc_switches)
1887 Record gcc command line switches in the object file.
1890 Common Report Var(flag_pcc_struct_return,0) Optimization
1891 Return small aggregates in registers
1895 Does nothing. Preserved for backward compatibility.
1898 Common Report Var(flag_lifetime_dse) Init(1) Optimization
1899 Tell DSE that the storage for a C++ object is dead when the constructor
1900 starts and when the destructor finishes.
1902 flive-range-shrinkage
1903 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
1904 Relief of register pressure through live range shrinkage
1907 Common Report Var(flag_rename_registers) Init(2) Optimization
1908 Perform a register renaming optimization pass
1911 Common Report Var(flag_schedule_fusion) Init(2) Optimization
1912 Perform a target dependent instruction fusion optimization pass
1915 Common Report Var(flag_reorder_blocks) Optimization
1916 Reorder basic blocks to improve code placement
1918 freorder-blocks-algorithm=
1919 Common Joined RejectNegative Enum(reorder_blocks_algorithm) Var(flag_reorder_blocks_algorithm) Init(REORDER_BLOCKS_ALGORITHM_SIMPLE) Optimization
1920 -freorder-blocks-algorithm=[simple|stc] Set the used basic block reordering algorithm
1923 Name(reorder_blocks_algorithm) Type(enum reorder_blocks_algorithm) UnknownError(unknown basic block reordering algorithm %qs)
1926 Enum(reorder_blocks_algorithm) String(simple) Value(REORDER_BLOCKS_ALGORITHM_SIMPLE)
1929 Enum(reorder_blocks_algorithm) String(stc) Value(REORDER_BLOCKS_ALGORITHM_STC)
1931 freorder-blocks-and-partition
1932 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1933 Reorder basic blocks and partition into hot and cold sections
1936 Common Report Var(flag_reorder_functions) Optimization
1937 Reorder functions to improve code placement
1939 frerun-cse-after-loop
1940 Common Report Var(flag_rerun_cse_after_loop) Optimization
1941 Add a common subexpression elimination pass after loop optimizations
1945 Does nothing. Preserved for backward compatibility.
1948 Common Report Var(flag_rounding_math) Optimization SetByCombined
1949 Disable optimizations that assume default FP rounding behavior
1952 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1953 Enable scheduling across basic blocks
1956 Common Report Var(flag_sched_pressure) Init(0) Optimization
1957 Enable register pressure sensitive insn scheduling
1960 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1961 Allow speculative motion of non-loads
1964 Common Report Var(flag_schedule_speculative_load) Optimization
1965 Allow speculative motion of some loads
1967 fsched-spec-load-dangerous
1968 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1969 Allow speculative motion of more loads
1972 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1973 -fsched-verbose=<number> Set the verbosity level of the scheduler
1975 fsched2-use-superblocks
1976 Common Report Var(flag_sched2_use_superblocks) Optimization
1977 If scheduling post reload, do superblock scheduling
1981 Does nothing. Preserved for backward compatibility.
1984 Common Report Var(flag_schedule_insns) Optimization
1985 Reschedule instructions before register allocation
1988 Common Report Var(flag_schedule_insns_after_reload) Optimization
1989 Reschedule instructions after register allocation
1991 ; This flag should be on when a target implements non-trivial
1992 ; scheduling hooks, maybe saving some information for its own sake.
1993 ; On IA64, for example, this is used for correct bundling.
1994 fselective-scheduling
1995 Common Report Var(flag_selective_scheduling) Optimization
1996 Schedule instructions using selective scheduling algorithm
1998 fselective-scheduling2
1999 Common Report Var(flag_selective_scheduling2) Optimization
2000 Run selective scheduling after reload
2002 fsel-sched-pipelining
2003 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
2004 Perform software pipelining of inner loops during selective scheduling
2006 fsel-sched-pipelining-outer-loops
2007 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
2008 Perform software pipelining of outer loops during selective scheduling
2010 fsel-sched-reschedule-pipelined
2011 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
2012 Reschedule pipelined regions without pipelining
2014 fsemantic-interposition
2015 Common Report Var(flag_semantic_interposition) Init(1)
2016 Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker
2018 ; sched_stalled_insns means that insns can be moved prematurely from the queue
2019 ; of stalled insns into the ready list.
2020 fsched-stalled-insns
2021 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
2022 Allow premature scheduling of queued insns
2024 fsched-stalled-insns=
2025 Common RejectNegative Joined UInteger Optimization
2026 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
2028 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
2029 ; be examined for a dependency on a stalled insn that is candidate for
2030 ; premature removal from the queue of stalled insns into the ready list (has
2031 ; an effect only if the flag 'sched_stalled_insns' is set).
2032 fsched-stalled-insns-dep
2033 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
2034 Set dependence distance checking in premature scheduling of queued insns
2036 fsched-stalled-insns-dep=
2037 Common RejectNegative Joined UInteger Optimization
2038 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
2040 fsched-group-heuristic
2041 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
2042 Enable the group heuristic in the scheduler
2044 fsched-critical-path-heuristic
2045 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
2046 Enable the critical path heuristic in the scheduler
2048 fsched-spec-insn-heuristic
2049 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
2050 Enable the speculative instruction heuristic in the scheduler
2052 fsched-rank-heuristic
2053 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
2054 Enable the rank heuristic in the scheduler
2056 fsched-last-insn-heuristic
2057 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
2058 Enable the last instruction heuristic in the scheduler
2060 fsched-dep-count-heuristic
2061 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
2062 Enable the dependent count heuristic in the scheduler
2065 Common Report Var(flag_section_anchors) Optimization
2066 Access data in the same section from shared anchor points
2070 Does nothing. Preserved for backward compatibility.
2074 Does nothing. Preserved for backward compatibility.
2077 Common Report Var(flag_ree) Init(0)
2078 Turn on Redundant Extensions Elimination pass.
2081 Common Report Var(flag_show_column) Init(1)
2082 Show column numbers in diagnostics, when available. Default on
2085 Common Report Var(flag_shrink_wrap) Optimization
2086 Emit function prologues only before parts of the function that need it,
2087 rather than at the top of the function.
2090 Common Report Var(flag_signaling_nans) Optimization SetByCombined
2091 Disable optimizations observable by IEEE signaling NaNs
2094 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
2095 Disable floating point optimizations that ignore the IEEE signedness of zero
2097 fsingle-precision-constant
2098 Common Report Var(flag_single_precision_constant) Optimization
2099 Convert floating point constants to single precision constants
2101 fsplit-ivs-in-unroller
2102 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
2103 Split lifetimes of induction variables when loops are unrolled
2106 Common Report Var(flag_split_stack) Init(-1)
2107 Generate discontiguous stack frames
2110 Common Report Var(flag_split_wide_types) Optimization
2111 Split wide types into independent registers
2114 Common Report Var(flag_ssa_phiopt) Optimization
2115 Optimize conditional patterns using SSA PHI nodes
2118 Common Report Var(flag_stdarg_opt) Init(1) Optimization
2119 Optimize amount of stdarg registers saved to stack at start of function
2121 fvariable-expansion-in-unroller
2122 Common Report Var(flag_variable_expansion_in_unroller) Optimization
2123 Apply variable expansion when loops are unrolled
2126 Common Report RejectNegative Joined
2127 -fstack-check=[no|generic|specific] Insert stack checking code into the program
2130 Common Alias(fstack-check=, specific, no)
2131 Insert stack checking code into the program. Same as -fstack-check=specific
2134 Common Var(common_deferred_options) Defer
2136 fstack-limit-register=
2137 Common RejectNegative Joined Var(common_deferred_options) Defer
2138 -fstack-limit-register=<register> Trap if the stack goes past <register>
2140 fstack-limit-symbol=
2141 Common RejectNegative Joined Var(common_deferred_options) Defer
2142 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
2145 Common Report Var(flag_stack_protect, 1) Init(-1)
2146 Use propolice as a stack protection method
2148 fstack-protector-all
2149 Common Report RejectNegative Var(flag_stack_protect, 2) Init(-1)
2150 Use a stack protection method for every function
2152 fstack-protector-strong
2153 Common Report RejectNegative Var(flag_stack_protect, 3) Init(-1)
2154 Use a smart stack protection method for certain functions
2156 fstack-protector-explicit
2157 Common Report RejectNegative Var(flag_stack_protect, 4)
2158 Use stack protection method only for functions with the stack_protect attribute
2161 Common RejectNegative Var(flag_stack_usage)
2162 Output stack usage information on a per-function basis
2166 Does nothing. Preserved for backward compatibility.
2168 ; Nonzero if we should do (language-dependent) alias analysis.
2169 ; Typically, this analysis will assume that expressions of certain
2170 ; types do not alias expressions of certain other types. Only used
2171 ; if alias analysis (in general) is enabled.
2173 Common Report Var(flag_strict_aliasing) Optimization
2174 Assume strict aliasing rules apply
2177 Common Report Var(flag_strict_overflow) Optimization
2178 Treat signed overflow as undefined
2181 Common Report Var(flag_sync_libcalls) Init(1)
2182 Implement __atomic operations via libcalls to legacy __sync functions
2185 Common Report Var(flag_syntax_only)
2186 Check for syntax errors, then stop
2189 Common Report Var(flag_test_coverage)
2190 Create data files needed by \"gcov\"
2193 Common Report Var(flag_thread_jumps) Optimization
2194 Perform jump threading optimizations
2197 Common Report Var(time_report)
2198 Report the time taken by each compiler pass
2201 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2202 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
2205 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2208 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2211 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2214 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2217 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2220 Common Report Var(flag_toplevel_reorder) Init(2)
2221 Reorder top level functions, variables, and asms
2224 Common Report Var(flag_tracer) Optimization
2225 Perform superblock formation via tail duplication
2227 ; Zero means that floating-point math operations cannot generate a
2228 ; (user-visible) trap. This is the case, for example, in nonstop
2229 ; IEEE 754 arithmetic.
2231 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2232 Assume floating-point operations can trap
2235 Common Report Var(flag_trapv) Optimization
2236 Trap for signed overflow in addition, subtraction and multiplication
2239 Common Report Var(flag_tree_ccp) Optimization
2240 Enable SSA-CCP optimization on trees
2243 Common Report Var(flag_tree_bit_ccp) Optimization
2244 Enable SSA-BIT-CCP optimization on trees
2248 Does nothing. Preserved for backward compatibility.
2251 Common Report Var(flag_tree_ch) Optimization
2252 Enable loop header copying on trees
2254 ftree-coalesce-inlined-vars
2255 Common Ignore RejectNegative
2256 Does nothing. Preserved for backward compatibility.
2259 Common Report Var(flag_tree_coalesce_vars) Optimization
2260 Enable SSA coalescing of user variables
2264 Does nothing. Preserved for backward compatibility.
2267 Common Report Var(flag_tree_copy_prop) Optimization
2268 Enable copy propagation on trees
2270 ftree-store-copy-prop
2272 Does nothing. Preserved for backward compatibility.
2275 Common Report Var(flag_tree_cselim) Init(2) Optimization
2276 Transform condition stores into unconditional ones
2278 ftree-switch-conversion
2279 Common Report Var(flag_tree_switch_conversion) Optimization
2280 Perform conversions of switch initializations.
2283 Common Report Var(flag_tree_dce) Optimization
2284 Enable SSA dead code elimination optimization on trees
2286 ftree-dominator-opts
2287 Common Report Var(flag_tree_dom) Optimization
2288 Enable dominator optimizations
2291 Common Report Var(flag_tree_tail_merge) Optimization
2292 Enable tail merging on trees
2295 Common Report Var(flag_tree_dse) Optimization
2296 Enable dead store elimination
2299 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2300 Enable forward propagation on trees
2303 Common Report Var(flag_tree_fre) Optimization
2304 Enable Full Redundancy Elimination (FRE) on trees
2307 Common Report Var(flag_optimize_strlen) Optimization
2308 Enable string length optimizations on trees
2310 fisolate-erroneous-paths-dereference
2311 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2312 Detect paths that trigger erroneous or undefined behavior due to
2313 dereferencing a null pointer. Isolate those paths from the main control
2314 flow and turn the statement with erroneous or undefined behavior into a trap.
2316 fisolate-erroneous-paths-attribute
2317 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2318 Detect paths that trigger erroneous or undefined behavior due a null value
2319 being used in a way forbidden by a returns_nonnull or nonnull
2320 attribute. Isolate those paths from the main control flow and turn the
2321 statement with erroneous or undefined behavior into a trap.
2323 ftree-loop-distribution
2324 Common Report Var(flag_tree_loop_distribution) Optimization
2325 Enable loop distribution on trees
2327 ftree-loop-distribute-patterns
2328 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2329 Enable loop distribution for patterns transformed into a library call
2332 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2333 Enable loop invariant motion on trees
2336 Common Alias(floop-nest-optimize)
2337 Enable loop nest transforms. Same as -floop-nest-optimize
2340 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2341 Create canonical induction variables in loops
2344 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2345 Enable loop optimizations on tree level
2347 ftree-parallelize-loops=
2348 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1) Optimization
2349 Enable automatic parallelization of loops
2352 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2353 Enable hoisting loads from conditional pointers.
2356 Common Report Var(flag_tree_pre) Optimization
2357 Enable SSA-PRE optimization on trees
2360 Common Report Var(flag_tree_partial_pre) Optimization
2361 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2364 Common Report Var(flag_tree_pta) Optimization
2365 Perform function-local points-to analysis on trees.
2368 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2369 Enable reassociation on tree level
2373 Does nothing. Preserved for backward compatibility.
2376 Common Report Var(flag_tree_sink) Optimization
2377 Enable SSA code sinking on trees
2380 Common Report Var(flag_tree_slsr) Optimization
2381 Perform straight-line strength reduction
2384 Common Report Var(flag_tree_sra) Optimization
2385 Perform scalar replacement of aggregates
2388 Common Report Var(flag_tree_ter) Optimization
2389 Replace temporary expressions in the SSA->normal pass
2392 Common Report Var(flag_tree_live_range_split) Optimization
2393 Perform live range splitting during the SSA->normal pass
2396 Common Report Var(flag_tree_vrp) Init(0) Optimization
2397 Perform Value Range Propagation on trees
2400 Common Report Var(flag_unit_at_a_time) Init(1)
2401 Compile whole compilation unit at a time
2404 Common Report Var(flag_unroll_loops) Optimization
2405 Perform loop unrolling when iteration count is known
2408 Common Report Var(flag_unroll_all_loops) Optimization
2409 Perform loop unrolling for all loops
2411 ; Nonzero means that loop optimizer may assume that the induction variables
2412 ; that control loops do not overflow and that the loops with nontrivial
2413 ; exit condition are not infinite
2414 funsafe-loop-optimizations
2415 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2416 Allow loop optimizations to assume that the loops behave in normal way
2419 Common Report Var(flag_associative_math) SetByCombined Optimization
2420 Allow optimization for floating-point arithmetic which may change the
2421 result of the operation due to rounding.
2424 Common Report Var(flag_reciprocal_math) SetByCombined Optimization
2425 Same as -fassociative-math for expressions which include division.
2427 ; Nonzero means that unsafe floating-point math optimizations are allowed
2428 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2429 ; are allowed to assume that their arguments and results are "normal"
2430 ; (e.g., nonnegative for SQRT).
2431 funsafe-math-optimizations
2432 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2433 Allow math optimizations that may violate IEEE or ISO standards
2436 Common Report Var(flag_unswitch_loops) Optimization
2437 Perform loop unswitching
2440 Common Report Var(flag_unwind_tables) Optimization
2441 Just generate unwind tables for exception handling
2444 Common Driver Negative(fuse-ld=gold)
2445 Use the bfd linker instead of the default linker
2448 Common Driver Negative(fuse-ld=bfd)
2449 Use the gold linker instead of the default linker
2452 Common Undocumented Var(flag_use_linker_plugin)
2454 ; Positive if we should track variables, negative if we should run
2455 ; the var-tracking pass only to discard debug annotations, zero if
2456 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2457 ; will be set according to optimize, debug_info_level and debug_hooks
2458 ; in process_options ().
2460 Common Report Var(flag_var_tracking) Init(2) Optimization
2461 Perform variable tracking
2463 ; Positive if we should track variables at assignments, negative if
2464 ; we should run the var-tracking pass only to discard debug
2465 ; annotations. When flag_var_tracking_assignments ==
2466 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2467 fvar-tracking-assignments
2468 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2469 Perform variable tracking by annotating assignments
2471 ; Nonzero if we should toggle flag_var_tracking_assignments after
2472 ; processing options and computing its default. */
2473 fvar-tracking-assignments-toggle
2474 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2475 Toggle -fvar-tracking-assignments
2477 ; Positive if we should track uninitialized variables, negative if
2478 ; we should run the var-tracking pass only to discard debug
2479 ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
2480 ; will be set according to flag_var_tracking.
2481 fvar-tracking-uninit
2482 Common Report Var(flag_var_tracking_uninit) Optimization
2483 Perform variable tracking and also tag variables that are uninitialized
2486 Common Report Var(flag_tree_vectorize) Optimization
2487 Enable vectorization on trees
2489 ftree-vectorizer-verbose=
2490 Common Joined RejectNegative Ignore
2491 Does nothing. Preserved for backward compatibility.
2493 ftree-loop-vectorize
2494 Common Report Var(flag_tree_loop_vectorize) Optimization
2495 Enable loop vectorization on trees
2498 Common Report Var(flag_tree_slp_vectorize) Optimization
2499 Enable basic block vectorization (SLP) on trees
2502 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT) Optimization
2503 Specifies the cost model for vectorization
2506 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED) Optimization
2507 Specifies the vectorization cost model for code marked with a simd directive
2510 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2513 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2516 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2519 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2522 Common RejectNegative Alias(fvect-cost-model=,dynamic)
2523 Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
2526 Common RejectNegative Alias(fvect-cost-model=,unlimited)
2527 Enables the unlimited vectorizer cost model. Preserved for backward compatibility.
2529 ftree-vect-loop-version
2531 Does nothing. Preserved for backward compatibility.
2534 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2535 Enable copy propagation of scalar-evolution information.
2537 ; -fverbose-asm causes extra commentary information to be produced in
2538 ; the generated assembly code (to make it more readable). This option
2539 ; is generally only of use to those who actually need to read the
2540 ; generated assembly code (perhaps while debugging the compiler itself).
2541 ; -fno-verbose-asm, the default, causes the extra information
2542 ; to not be added and is useful when comparing two assembler files.
2544 Common Report Var(flag_verbose_asm)
2545 Add extra commentary to assembler output
2548 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2549 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2552 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2555 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2558 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2561 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2564 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2567 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2568 Validate vtable pointers before using them.
2571 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2574 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2577 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2580 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2583 Common Var(flag_vtv_counts)
2584 Output vtable verification counters.
2587 Common Var(flag_vtv_debug)
2588 Output vtable verification pointer sets information.
2591 Common Report Var(flag_value_profile_transformations) Optimization
2592 Use expression value profiles in optimizations
2595 Common Report Var(flag_web) Init(2) Optimization
2596 Construct webs and split unrelated uses of single variable
2598 ftree-builtin-call-dce
2599 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2600 Enable conditional dead code elimination for builtin calls
2603 Common Report Var(flag_whole_program) Init(0)
2604 Perform whole program optimizations
2607 Common Report Var(flag_wrapv) Optimization
2608 Assume signed arithmetic overflow wraps around
2610 fzero-initialized-in-bss
2611 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2612 Put zero initialized data in the bss section
2615 Common JoinedOrMissing
2616 Generate debug information in default format
2619 Common JoinedOrMissing Negative(gdwarf)
2620 Generate debug information in COFF format
2623 Common JoinedOrMissing Negative(gdwarf-)
2624 Generate debug information in default version of DWARF format
2627 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2628 Generate debug information in DWARF v2 (or later) format
2631 Common JoinedOrMissing
2632 Generate debug information in default extended format
2635 Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2636 Don't generate DWARF pubnames and pubtypes sections.
2639 Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2640 Generate DWARF pubnames and pubtypes sections.
2643 Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2644 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2646 gno-record-gcc-switches
2647 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2648 Don't record gcc command line switches in DWARF DW_AT_producer.
2650 grecord-gcc-switches
2651 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2652 Record gcc command line switches in DWARF DW_AT_producer.
2655 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2656 Don't generate debug information in separate .dwo files
2659 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2660 Generate debug information in separate .dwo files
2663 Common JoinedOrMissing Negative(gstabs+)
2664 Generate debug information in STABS format
2667 Common JoinedOrMissing Negative(gvms)
2668 Generate debug information in extended STABS format
2671 Common RejectNegative Var(dwarf_strict,0) Init(0)
2672 Emit DWARF additions beyond selected version
2675 Common Report RejectNegative Var(dwarf_strict,1)
2676 Don't emit DWARF additions beyond selected version
2679 Common Report Var(flag_gtoggle)
2680 Toggle debug information generation
2683 Common JoinedOrMissing Negative(gxcoff)
2684 Generate debug information in VMS format
2687 Common JoinedOrMissing Negative(gxcoff+)
2688 Generate debug information in XCOFF format
2691 Common JoinedOrMissing Negative(gcoff)
2692 Generate debug information in extended XCOFF format
2695 Name(compressed_debug_sections) Type(int)
2697 ; Since -gz= is completely handled in specs, the values aren't used and we
2698 ; assign arbitrary constants.
2700 Enum(compressed_debug_sections) String(none) Value(0)
2703 Enum(compressed_debug_sections) String(zlib) Value(1)
2706 Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
2710 Generate compressed debug sections
2713 Common Driver Joined Enum(compressed_debug_sections)
2714 -gz=<format> Generate compressed debug sections in format <format>
2717 Driver Joined Separate
2720 Common Joined Var(plugindir_string) Init(0)
2721 -iplugindir=<dir> Set <dir> to be the default plugin directory
2724 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2725 -imultiarch <dir> Set <dir> to be the multiarch include subdirectory
2728 Driver Joined Separate
2733 no-canonical-prefixes
2746 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2747 -o <file> Place output into <file>
2750 Common Var(profile_flag)
2751 Enable function profiling
2754 Driver Var(pass_exit_codes)
2757 Common Alias(Wpedantic)
2760 Common Var(flag_pedantic_errors)
2761 Like -pedantic but issue them as errors
2767 Driver Var(use_pipes)
2770 Driver JoinedOrMissing Var(print_file_name)
2772 print-libgcc-file-name
2775 print-multi-directory
2776 Driver Var(print_multi_directory)
2779 Driver Var(print_multi_lib)
2781 print-multi-os-directory
2782 Driver Var(print_multi_os_directory)
2785 Driver Var(print_multiarch)
2788 Driver JoinedOrMissing Var(print_prog_name)
2791 Driver Var(print_search_dirs)
2794 Driver Var(print_sysroot)
2796 print-sysroot-headers-suffix
2797 Driver Var(print_sysroot_headers_suffix)
2800 Common Var(quiet_flag) RejectDriver
2801 Do not display functions compiled or elapsed time
2819 Driver Var(report_times)
2822 Driver JoinedOrMissing
2825 Driver Joined Separate
2829 ; C option, but driver must not handle as "-u ndef".
2832 Common Driver Var(verbose_flag)
2833 Enable verbose output
2836 Common Var(version_flag) RejectDriver
2837 Display the compiler's version
2840 Common Var(inhibit_warnings)
2844 Driver Separate Var(wrapper_string)
2847 Driver Joined Separate
2850 Driver RejectNegative Negative(pie)
2851 Create a shared library
2857 Driver Separate Alias(specs=)
2870 ; Documented for Fortran, but always accepted by driver.
2877 ; Documented for Go, but always accepted by driver.
2895 Driver RejectNegative Negative(shared)
2896 Don't create a position independent executable
2899 Driver RejectNegative Negative(no-pie)
2900 Create a position independent executable
2903 Driver Joined Separate
2906 Common Report Var(flag_ipa_ra) Optimization
2907 Use caller save register across calls if possible
2909 ; This comment is to ensure we retain the blank line above.