1 ; Options for the language- and target-independent parts of the compiler.
3 ; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
4 ; Free Software Foundation, Inc.
6 ; This file is part of GCC.
8 ; GCC is free software; you can redistribute it and/or modify it under
9 ; the terms of the GNU General Public License as published by the Free
10 ; Software Foundation; either version 3, or (at your option) any later
13 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 ; You should have received a copy of the GNU General Public License
19 ; along with GCC; see the file COPYING3. If not see
20 ; <http://www.gnu.org/licenses/>.
22 ; See the GCC internals manual (options.texi) for a description of this file's format.
24 ; Please try to keep this file in ASCII collating order.
35 ; Not used directly to control optimizations, only to save -Ofast
36 ; setting for "optimize" attributes.
40 ; True if this is the lto front end. This is used to disable gimple
41 ; generation and lowering passes that are normally run on the output
42 ; of a front end. These passes must be bypassed for lto since they
43 ; have already been done before the gimple was written.
47 ; 0 means straightforward implementation of complex divide acceptable.
48 ; 1 means wide ranges of inputs must work for complex divide.
49 ; 2 means C99-like requirements for complex multiply and divide.
51 int flag_complex_method = 1
53 ; Nonzero if subexpressions must be evaluated from left-to-right.
55 int flag_evaluation_order = 0
57 ; Language specific warning pass for unused results.
59 bool flag_warn_unused_result = false
64 ; Nonzero if we should write GIMPLE bytecode for link-time optimization.
68 ; True to warn about any objects definitions whose size is larger
69 ; than N bytes. Also want about function definitions whose returned
70 ; values are larger than N bytes, where N is 'larger_than_size'.
75 HOST_WIDE_INT larger_than_size
77 ; True to warn about any function whose frame size is larger
80 bool warn_frame_larger_than
83 HOST_WIDE_INT frame_larger_than_size
85 ; Nonzero means we should be saving declaration info into a .X file.
87 int flag_gen_aux_info = 0
89 ; Nonzero if we are compiling code for a shared library, zero for
94 ; These two are really VEC(char_p,heap) *.
97 void *flag_instrument_functions_exclude_functions
100 void *flag_instrument_functions_exclude_files
102 ; Generic structs (e.g. templates not explicitly specialized)
103 ; may not have a compilation unit associated with them, and so
104 ; may need to be treated differently from ordinary structs.
106 ; Structs only handled by reference (indirectly), will also usually
107 ; not need as much debugging information.
110 enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
113 enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
115 ; True if we should exit after parsing options.
117 bool exit_after_options
119 ; Type(s) of debugging information we are producing (if any). See
120 ; flag-types.h for the definitions of the different possible types of
121 ; debugging information.
123 enum debug_info_type write_symbols = NO_DEBUG
125 ; Level of debugging information we are producing. See flag-types.h
126 ; for the definitions of the different possible levels.
128 enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
130 ; Nonzero means use GNU-only extensions in the generated symbolic
131 ; debugging information. Currently, this only has an effect when
132 ; write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG.
134 bool use_gnu_debug_info_extensions
136 ; Original value of maximum field alignment in bytes, specified via
137 ; -fpack-struct=<value>.
139 unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
142 enum vect_verbosity_levels user_vect_verbosity_level = MAX_VERBOSITY_LEVEL
144 ; Type of stack check.
146 enum stack_check_type flag_stack_check = NO_STACK_CHECK
148 ; True if stack usage information needs to be computed.
150 bool flag_stack_usage_info = false
152 ; -dA causes debug commentary information to be produced in
153 ; the generated assembly code (to make it more readable). This option
154 ; is generally only of use to those who actually need to read the
155 ; generated assembly code (perhaps while debugging the compiler itself).
156 ; Currently, this switch is only used by dwarf2out.c; however, it is intended
157 ; to be a catchall for printing debug information in the assembler file.
161 ; -dP causes the rtl to be emitted as a comment in assembly.
163 int flag_dump_rtl_in_asm
165 ; Whether -da was passed (used only in handle_common_deferred_options).
167 bool flag_dump_all_passed
169 ; Other flags saying which kinds of debugging dump have been requested.
172 int rtl_dump_and_exit
175 int flag_print_asm_name
178 enum graph_dump_types graph_dump_format = no_graph
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
224 Driver Alias(coverage)
230 Common Separate Alias(d)
233 Common Joined Alias(d)
236 Common Separate Alias(dumpbase)
239 Common Separate Alias(dumpdir)
242 Driver Separate Alias(e)
245 Driver Joined Alias(e)
248 Common Warning Alias(Wextra)
251 Driver Separate Alias(Xassembler)
254 Driver JoinedOrMissing Alias(Xassembler)
257 Driver Separate Alias(Xlinker)
260 Driver JoinedOrMissing Alias(Xlinker)
263 Driver Separate Alias(u)
266 Driver Joined Alias(u)
269 Common Driver Var(help_flag)
270 Display this information
273 Common Driver Report Joined
274 --help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params
277 Driver Separate Alias(x)
280 Driver Joined Alias(x)
283 Driver Separate Alias(L)
286 Driver Joined Alias(L)
288 -no-canonical-prefixes
289 Driver Alias(no-canonical-prefixes)
291 -no-standard-libraries
292 Driver Alias(nostdlib)
301 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
304 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
307 Driver Alias(pass-exit-codes)
310 Common Alias(Wpedantic)
313 Common Alias(pedantic-errors)
322 Driver Separate Alias(B)
325 Driver JoinedOrMissing Alias(B)
331 Driver Separate Alias(print-file-name=)
334 Driver JoinedOrMissing Alias(print-file-name=)
336 -print-libgcc-file-name
337 Driver Alias(print-libgcc-file-name)
339 -print-multi-directory
340 Driver Alias(print-multi-directory)
343 Driver Alias(print-multi-lib)
345 -print-multi-os-directory
346 Driver Alias(print-multi-os-directory)
349 Driver Separate Alias(print-prog-name=)
352 Driver JoinedOrMissing Alias(print-prog-name=)
355 Driver Alias(print-search-dirs)
358 Driver Alias(print-sysroot)
360 -print-sysroot-headers-suffix
361 Driver Alias(print-sysroot-headers-suffix)
367 Driver Alias(save-temps)
373 Driver Separate Alias(specs=)
376 Driver Joined Alias(specs=)
382 Driver Alias(symbolic)
386 Alias for --help=target
394 ;; The driver used to convert options such as --help into forms such
395 ;; as -fhelp; the following four entries are for compatibility with
396 ;; any direct uses of those (undocumented) -f forms
398 Common Driver Alias(-help)
401 Common Driver Joined Alias(-help=)
404 Common Driver Alias(-target-help)
407 Common Driver Alias(-version)
411 --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
414 Common Joined Alias(-param)
417 Driver Separate Alias(-sysroot=)
420 Driver JoinedOrMissing
426 Driver Joined Separate
432 Driver Joined Separate
438 Common JoinedOrMissing Optimization
439 -O<number> Set optimization level to <number>
443 Optimize for space rather than speed
447 Optimize for speed disregarding exact standards compliance
459 Driver Joined Separate
465 Driver Joined Separate
486 Common RejectNegative Warning Alias(Wextra)
487 This switch is deprecated; use -Wextra instead
490 Driver JoinedOrMissing
493 Driver JoinedOrMissing
496 Driver JoinedOrMissing
499 Common Var(warn_aggregate_return) Warning
500 Warn about returning structures, unions or arrays
503 Common Var(warn_array_bounds) Warning
504 Warn if an array is accessed out of bounds
507 Common Var(warn_attributes) Init(1) Warning
508 Warn about inappropriate attribute usage
511 Common Var(warn_cast_align) Warning
512 Warn about pointer casts which increase alignment
515 Common Var(warn_cpp) Init(1) Warning
516 Warn when a #warning directive is encountered
518 Wdeprecated-declarations
519 Common Var(warn_deprecated_decl) Init(1) Warning
520 Warn about uses of __attribute__((deprecated)) declarations
522 Wdisabled-optimization
523 Common Var(warn_disabled_optimization) Warning
524 Warn when an optimization pass is disabled
527 Common Var(warnings_are_errors)
528 Treat all warnings as errors
532 Treat specified warning as error
535 Common Var(extra_warnings) Warning
536 Print extra (possibly unwanted) warnings
539 Common Var(flag_fatal_errors)
540 Exit on the first error occurred
543 Common RejectNegative Joined UInteger
544 -Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
547 Common Var(warn_free_nonheap_object) Init(1) Warning
548 Warn when attempting to free a non-heap object
551 Common Var(warn_inline) Warning
552 Warn when an inlined function cannot be inlined
554 Winvalid-memory-model
555 Common Var(warn_invalid_memory_model) Init(1) Warning
556 Warn when an atomic memory model parameter is known to be outside the valid range.
559 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
562 Common RejectNegative Joined UInteger Warning
563 -Wlarger-than=<number> Warn if an object is larger than <number> bytes
565 Wunsafe-loop-optimizations
566 Common Var(warn_unsafe_loop_optimizations) Warning
567 Warn if the loop cannot be optimized due to nontrivial assumptions.
570 Common Alias(Wsuggest-attribute=noreturn)
573 Common Var(warn_overflow) Init(1) Warning
574 Warn about overflow in arithmetic expressions
577 Common Var(warn_packed) Warning
578 Warn when the packed attribute has no effect on struct layout
581 Common Var(warn_padded) Warning
582 Warn when padding is required to align structure members
585 Common Var(pedantic) Warning
586 Issue warnings needed for strict compliance to the standard
589 Common Var(warn_shadow) Warning
590 Warn when one local variable shadows another
593 Common Var(warn_stack_protect) Warning
594 Warn when not issuing stack smashing protection for some reason
597 Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
598 Warn if stack usage might be larger than specified amount
602 Warn about code which might break strict aliasing rules
605 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Init(-1) Warning
606 Warn about code which might break strict aliasing rules
610 Warn about optimizations that assume that signed overflow is undefined
613 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Init(-1) Warning
614 Warn about optimizations that assume that signed overflow is undefined
616 Wsuggest-attribute=const
617 Common Var(warn_suggest_attribute_const) Warning
618 Warn about functions which might be candidates for __attribute__((const))
620 Wsuggest-attribute=pure
621 Common Var(warn_suggest_attribute_pure) Warning
622 Warn about functions which might be candidates for __attribute__((pure))
624 Wsuggest-attribute=noreturn
625 Common Var(warn_suggest_attribute_noreturn) Warning
626 Warn about functions which might be candidates for __attribute__((noreturn))
629 Common Var(warn_switch) Warning
630 Warn about enumerated switches, with no default, missing a case
633 Common Var(warn_switch_default) Warning
634 Warn about enumerated switches missing a \"default:\" statement
637 Common Var(warn_switch_enum) Warning
638 Warn about all enumerated switches missing a specific case
641 Common Var(warn_system_headers) Warning
642 Do not suppress warnings from system headers
645 Common Var(warn_trampolines) Warning
646 Warn whenever a trampoline is generated
649 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
650 Warn if a comparison is always true or always false due to the limited range of the data type
653 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
654 Warn about uninitialized automatic variables
657 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
658 Warn about maybe uninitialized automatic variables
662 Does nothing. Preserved for backward compatibility.
665 Common Var(warn_unused) Init(0) Warning
666 Enable all -Wunused- warnings
668 Wunused-but-set-parameter
669 Common Var(warn_unused_but_set_parameter) Init(-1) Warning
670 Warn when a function parameter is only set, otherwise unused
672 Wunused-but-set-variable
673 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
674 Warn when a variable is only set, otherwise unused
677 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
678 Warn when a function is unused
681 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
682 Warn when a label is unused
685 Common Var(warn_unused_parameter) Init(-1) Warning
686 Warn when a function parameter is unused
689 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
690 Warn when an expression value is unused
693 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
694 Warn when a variable is unused
697 Common Var(warn_coverage_mismatch) Init(1) Warning
698 Warn in case profiles in -fprofile-use do not match
700 Wvector-operation-performance
701 Common Var(warn_vector_operation_performance) Warning
702 Warn when a vector operation is compiled outside the SIMD
717 Common Separate Var(aux_info_file_name)
718 -aux-info <file> Emit declaration information into <file>
721 Common Joined Alias(aux-info)
724 Common Separate RejectDriver Var(aux_base_name)
727 Common Separate RejectDriver
737 -d<letters> Enable dumps from specific passes of the compiler
740 Common Separate Var(dump_base_name)
741 -dumpbase <file> Set the file basename to be used for dumps
744 Common Separate Var(dump_dir_name)
745 -dumpdir <dir> Set the directory name to be used for dumps
757 Driver Joined Separate
759 ; This option has historically been passed down to the linker by an
760 ; accident of a %{e*} spec, so ensure it continues to be passed down
761 ; as a single option. The supported option for this purpose is
762 ; -rdynamic. See PR 47390.
766 ; The version of the C++ ABI in use. The following values are allowed:
768 ; 0: The version of the ABI believed most conformant with the C++ ABI
769 ; specification. This ABI may change as bugs are discovered and fixed.
770 ; Therefore, 0 will not necessarily indicate the same ABI in different
773 ; 1: The version of the ABI first used in G++ 3.2.
775 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
777 ; 3: The version of the ABI that fixes the missing underscore
778 ; in template non-type arguments of pointer type.
780 ; 4: The version of the ABI that introduces unambiguous mangling of
781 ; vector types. First selectable in G++ 4.5.
783 ; 5: The version of the ABI that ignores attribute const/noreturn
784 ; in function pointer mangling, and corrects mangling of decltype and
785 ; function parameters used in other parameters and the return type.
786 ; First selectable in G++ 4.6.
788 ; 6: The version of the ABI that doesn't promote scoped enums to int and
789 ; changes the mangling of template argument packs, const/static_cast,
790 ; prefix ++ and --, and a class scope function used as a template
792 ; First selectable in G++ 4.7.
794 ; 7: The version of the ABI that treats nullptr_t as a builtin type.
795 ; First selectable in G++ 4.8.
796 ; Additional positive integers will be assigned as new versions of
797 ; the ABI become the default version of the ABI.
799 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(2)
802 Common Report Var(align_functions,0) Optimization UInteger
803 Align the start of functions
806 Common RejectNegative Joined UInteger Var(align_functions)
809 Common Report Var(align_jumps,0) Optimization UInteger
810 Align labels which are only reached by jumping
813 Common RejectNegative Joined UInteger Var(align_jumps)
816 Common Report Var(align_labels,0) Optimization UInteger
820 Common RejectNegative Joined UInteger Var(align_labels)
823 Common Report Var(align_loops,0) Optimization UInteger
824 Align the start of loops
827 Common RejectNegative Joined UInteger Var(align_loops)
831 Does nothing. Preserved for backward compatibility.
835 Does nothing. Preserved for backward compatibility.
837 fargument-noalias-global
839 Does nothing. Preserved for backward compatibility.
841 fargument-noalias-anything
843 Does nothing. Preserved for backward compatibility.
845 fasynchronous-unwind-tables
846 Common Report Var(flag_asynchronous_unwind_tables) Optimization
847 Generate unwind tables that are exact at each instruction boundary
850 Common Report Var(flag_auto_inc_dec) Init(1)
851 Generate auto-inc/dec instructions
853 ; -fcheck-bounds causes gcc to generate array bounds checks.
854 ; For C, C++ and ObjC: defaults off.
855 ; For Java: defaults to on.
856 ; For Fortran: defaults to off.
858 Common Report Var(flag_bounds_check)
859 Generate code to check bounds before indexing arrays
862 Common Report Var(flag_branch_on_count_reg) Init(1) Optimization
863 Replace add, compare, branch with branch on count register
865 fbranch-probabilities
866 Common Report Var(flag_branch_probabilities) Optimization
867 Use profiling information for branch probabilities
869 fbranch-target-load-optimize
870 Common Report Var(flag_branch_target_load_optimize) Optimization
871 Perform branch target load optimization before prologue / epilogue threading
873 fbranch-target-load-optimize2
874 Common Report Var(flag_branch_target_load_optimize2) Optimization
875 Perform branch target load optimization after prologue / epilogue threading
878 Common Report Var(flag_btr_bb_exclusive) Optimization
879 Restrict target load migration not to re-use registers in any basic block
882 Common Joined RejectNegative Var(common_deferred_options) Defer
883 -fcall-saved-<register> Mark <register> as being preserved across functions
886 Common Joined RejectNegative Var(common_deferred_options) Defer
887 -fcall-used-<register> Mark <register> as being corrupted by function calls
889 ; Nonzero for -fcaller-saves: allocate values in regs that need to
890 ; be saved across function calls, if that produces overall better code.
891 ; Optional now, so people can test it.
893 Common Report Var(flag_caller_saves) Optimization
894 Save registers around function calls
897 Common Report Var(flag_check_data_deps)
898 Compare the results of several data dependence analyzers.
900 fcombine-stack-adjustments
901 Common Report Var(flag_combine_stack_adjustments) Optimization
902 Looks for opportunities to reduce stack adjustments and stack references.
905 Common Report Var(flag_no_common,0) Optimization
906 Do not put uninitialized globals in the common section
910 ; Converted by the driver to -fcompare-debug= options.
913 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
914 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
916 fcompare-debug-second
917 Common Driver RejectNegative Var(flag_compare_debug)
918 Run only the second compilation of -fcompare-debug
921 Common Report Var(flag_compare_elim_after_reload) Optimization
922 Perform comparison elimination after register allocation has finished
925 Common Var(flag_conserve_stack) Optimization
926 Do not perform optimizations increasing noticeably stack usage
929 Common Report Var(flag_cprop_registers) Optimization
930 Perform a register copy-propagation optimization pass
933 Common Report Var(flag_crossjumping) Optimization
934 Perform cross-jumping optimization
937 Common Report Var(flag_cse_follow_jumps) Optimization
938 When running CSE, follow jumps to their targets
942 Does nothing. Preserved for backward compatibility.
945 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
946 Omit range reduction step when performing complex division
949 Common Report Var(flag_cx_fortran_rules) Optimization
950 Complex multiplication and division follow Fortran rules
953 Common Report Var(flag_data_sections) Optimization
954 Place data items into their own section
957 Common Report Var(common_deferred_options) Defer
958 List all available debugging counters with their limits and counts.
961 Common RejectNegative Joined Var(common_deferred_options) Defer
962 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
965 Common Joined RejectNegative Var(common_deferred_options) Defer
966 Map one directory name to another in debug information
969 Common Report Var(flag_debug_types_section) Init(0)
970 Output .debug_types section when using DWARF v4 debuginfo.
972 ; Nonzero for -fdefer-pop: don't pop args after each function call
973 ; instead save them up to pop many calls' args with one insns.
975 Common Report Var(flag_defer_pop) Optimization
976 Defer popping functions args from stack until later
979 Common Report Var(flag_delayed_branch) Optimization
980 Attempt to fill delay slots of branch instructions
982 fdelete-dead-exceptions
983 Common Report Var(flag_delete_dead_exceptions) Init(0)
984 Delete dead instructions that may throw exceptions
986 fdelete-null-pointer-checks
987 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
988 Delete useless null pointer checks
991 Common Report Var(flag_devirtualize) Optimization
992 Try to convert virtual calls to direct ones.
994 fdiagnostics-show-location=
995 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
996 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
998 ; Required for these enum values.
1003 Name(diagnostic_prefixing_rule) Type(int)
1006 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1009 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1011 fdiagnostics-show-caret
1012 Common Var(flag_diagnostics_show_caret) Init(1)
1013 Show the source line with a caret indicating the column
1015 fdiagnostics-show-option
1016 Common Var(flag_diagnostics_show_option) Init(1)
1017 Amend appropriate diagnostic messages with the command line option that controls them
1020 Common Joined RejectNegative Var(common_deferred_options) Defer
1021 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1024 Common Joined RejectNegative Var(common_deferred_options) Defer
1025 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1028 Common Joined RejectNegative Var(common_deferred_options) Defer
1029 -fdump-<type> Dump various compiler internals to a file
1032 Driver RejectNegative
1035 Common RejectNegative Joined Var(flag_dump_final_insns)
1036 -fdump-final-insns=filename Dump to filename the insns at the end of translation
1039 Common RejectNegative Joined Var(flag_dump_go_spec)
1040 -fdump-go-spec=filename Write all declarations to file as Go code
1043 Common Report Var(flag_dump_noaddr)
1044 Suppress output of addresses in debugging dumps
1047 Common Var(flag_dump_passes) Init(0)
1048 Dump optimization passes
1051 Common Report Var(flag_dump_unnumbered)
1052 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1054 fdump-unnumbered-links
1055 Common Report Var(flag_dump_unnumbered_links)
1056 Suppress output of previous and next insn numbers in debugging dumps
1059 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1060 Enable CFI tables via GAS assembler directives.
1063 Common Report Var(flag_early_inlining) Init(1) Optimization
1064 Perform early inlining
1066 feliminate-dwarf2-dups
1067 Common Report Var(flag_eliminate_dwarf2_dups)
1068 Perform DWARF2 duplicate elimination
1071 Common Report Var(flag_ipa_sra) Init(0) Optimization
1072 Perform interprocedural reduction of aggregates
1074 feliminate-unused-debug-symbols
1075 Common Report Var(flag_debug_only_used_symbols)
1076 Perform unused type elimination in debug info
1078 feliminate-unused-debug-types
1079 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1080 Perform unused type elimination in debug info
1082 femit-class-debug-always
1083 Common Report Var(flag_emit_class_debug_always) Init(0)
1084 Do not suppress C++ class debug information.
1087 Common Report Var(flag_exceptions) Optimization
1088 Enable exception handling
1090 fexpensive-optimizations
1091 Common Report Var(flag_expensive_optimizations) Optimization
1092 Perform a number of minor, expensive optimizations
1095 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1096 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1099 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1102 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1105 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1111 Common Var(flag_fat_lto_objects) Init(1)
1112 Output lto objects containing both the intermediate language and binary output.
1115 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1116 Assume no NaNs or infinities are generated
1119 Common Joined RejectNegative Var(common_deferred_options) Defer
1120 -ffixed-<register> Mark <register> as being unavailable to the compiler
1123 Common Report Var(flag_float_store) Optimization
1124 Don't allocate floats and doubles in extended-precision registers
1128 Does nothing. Preserved for backward compatibility.
1131 Common Report Var(flag_forward_propagate) Optimization
1132 Perform a forward propagation pass on RTL
1135 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1136 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1139 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1142 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1144 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1146 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1149 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1151 ; Nonzero means don't put addresses of constant functions in registers.
1152 ; Used for compiling the Unix kernel, where strange substitutions are
1153 ; done on the assembly output.
1155 Common Report Var(flag_no_function_cse,0)
1156 Allow function addresses to be held in registers
1159 Common Report Var(flag_function_sections)
1160 Place each function into its own section
1163 Common Report Var(flag_gcse) Optimization
1164 Perform global common subexpression elimination
1167 Common Report Var(flag_gcse_lm) Init(1) Optimization
1168 Perform enhanced load motion during global common subexpression elimination
1171 Common Report Var(flag_gcse_sm) Init(0) Optimization
1172 Perform store motion after global common subexpression elimination
1175 Common Report Var(flag_gcse_las) Init(0) Optimization
1176 Perform redundant load after store elimination in global common subexpression
1180 Common Report Var(flag_gcse_after_reload) Optimization
1181 Perform global common subexpression elimination after register allocation
1184 ; This option is not documented yet as its semantics will change.
1186 Common Report Var(flag_graphite)
1187 Enable in and out of Graphite representation
1190 Common Report Var(flag_graphite_identity) Optimization
1191 Enable Graphite Identity transformation
1193 fhoist-adjacent-loads
1194 Common Report Var(flag_hoist_adjacent_loads) Optimization
1195 Enable hoisting adjacent loads to encourage generating conditional move
1198 floop-parallelize-all
1199 Common Report Var(flag_loop_parallelize_all) Optimization
1200 Mark all loops as parallel
1203 Common Report Var(flag_loop_strip_mine) Optimization
1204 Enable Loop Strip Mining transformation
1207 Common Report Var(flag_loop_interchange) Optimization
1208 Enable Loop Interchange transformation
1211 Common Report Var(flag_loop_block) Optimization
1212 Enable Loop Blocking transformation
1215 Common Report Var(flag_tm)
1216 Enable support for GNU transactional memory
1220 Does nothing. Preserved for backward compatibility.
1223 Common Report Var(flag_loop_optimize_isl) Optimization
1224 Enable the ISL based loop nest optimizer
1226 fstrict-volatile-bitfields
1227 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1228 Force bitfield accesses to match their type width
1230 fguess-branch-probability
1231 Common Report Var(flag_guess_branch_prob) Optimization
1232 Enable guessing of branch probabilities
1234 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1235 ; Generate position-independent code for executables if possible
1236 ; On SVR4 targets, it also controls whether or not to emit a
1237 ; string identifying the compiler.
1239 Common Report Var(flag_no_ident,0)
1240 Process #ident directives
1243 Common Report Var(flag_if_conversion) Optimization
1244 Perform conversion of conditional jumps to branchless equivalents
1247 Common Report Var(flag_if_conversion2) Optimization
1248 Perform conversion of conditional jumps to conditional execution
1251 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1252 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1255 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1258 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1261 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1264 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1266 ftree-loop-if-convert
1267 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1268 Convert conditional jumps in innermost loops to branchless equivalents
1270 ftree-loop-if-convert-stores
1271 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1272 Also if-convert conditional jumps containing memory writes
1274 ; -finhibit-size-directive inhibits output of .size for ELF.
1275 ; This is used only for compiling crtstuff.c,
1276 ; and it may be extended to other effects
1277 ; needed for crtstuff.c on other systems.
1278 finhibit-size-directive
1279 Common Report Var(flag_inhibit_size_directive)
1280 Do not generate .size directives
1283 Common Report Var(flag_indirect_inlining)
1284 Perform indirect inlining
1286 ; General flag to enable inlining. Specifying -fno-inline will disable
1287 ; all inlining apart from always-inline functions.
1289 Common Report Var(flag_no_inline,0) Init(0)
1290 Enable inlining of function declared \"inline\", disabling disables all inlining
1292 finline-small-functions
1293 Common Report Var(flag_inline_small_functions) Optimization
1294 Integrate functions into their callers when code size is known not to grow
1297 Common Report Var(flag_inline_functions) Optimization
1298 Integrate functions not declared \"inline\" into their callers when profitable
1300 finline-functions-called-once
1301 Common Report Var(flag_inline_functions_called_once) Optimization
1302 Integrate functions only required by their single caller
1305 Common RejectNegative Joined Alias(finline-limit=)
1308 Common RejectNegative Joined UInteger
1309 -finline-limit=<number> Limit the size of inlined functions to <number>
1312 Common Report Var(flag_inline_atomics) Init(1) Optimization
1313 Inline __atomic operations when a lock free instruction sequence is available.
1315 finstrument-functions
1316 Common Report Var(flag_instrument_function_entry_exit)
1317 Instrument function entry and exit with profiling calls
1319 finstrument-functions-exclude-function-list=
1320 Common RejectNegative Joined
1321 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1323 finstrument-functions-exclude-file-list=
1324 Common RejectNegative Joined
1325 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1328 Common Report Var(flag_ipa_cp) Optimization
1329 Perform Interprocedural constant propagation
1332 Common Report Var(flag_ipa_cp_clone) Optimization
1333 Perform cloning to make Interprocedural constant propagation stronger
1336 Common Report Var(flag_ipa_profile) Init(0) Optimization
1337 Perform interprocedural profile propagation
1340 Common Report Var(flag_ipa_pta) Init(0) Optimization
1341 Perform interprocedural points-to analysis
1344 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1345 Discover pure and const functions
1348 Common Report Var(flag_ipa_reference) Init(0) Optimization
1349 Discover readonly and non addressable static variables
1352 Common Report Var(flag_ipa_matrix_reorg) Optimization
1353 Perform matrix layout flattening and transposing based
1354 on profiling information.
1358 Does nothing. Preserved for backward compatibility.
1361 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1362 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1365 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1368 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1371 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1374 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1375 -fira-region=[one|all|mixed] Set regions for IRA
1378 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1381 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1384 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1387 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1390 Common Report Var(flag_ira_loop_pressure)
1391 Use IRA based register pressure calculation
1392 in RTL loop optimizations.
1394 fira-share-save-slots
1395 Common Report Var(flag_ira_share_save_slots) Init(1)
1396 Share slots for saving different hard registers.
1398 fira-share-spill-slots
1399 Common Report Var(flag_ira_share_spill_slots) Init(1)
1400 Share stack slots for spilled pseudo-registers.
1403 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1404 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1407 Common Report Var(flag_ivopts) Init(1) Optimization
1408 Optimize induction variables on trees
1411 Common Var(flag_jump_tables) Init(1) Optimization
1412 Use jump tables for sufficiently large switch statements
1414 fkeep-inline-functions
1415 Common Report Var(flag_keep_inline_functions)
1416 Generate code for functions even if they are fully inlined
1419 Common Report Var(flag_keep_static_consts) Init(1)
1420 Emit static const variables even if they are not used
1423 Common Report Var(flag_leading_underscore) Init(-1)
1424 Give external symbols a leading underscore
1428 Does nothing. Preserved for backward compatibility.
1432 Enable link-time optimization.
1435 Common RejectNegative Joined Var(flag_lto)
1436 Link-time optimization with number of parallel jobs or jobserver.
1439 Common Var(flag_lto_partition_1to1)
1440 Partition functions and vars at linktime based on object files they originate from
1442 flto-partition=balanced
1443 Common Var(flag_lto_partition_balanced)
1444 Partition functions and vars at linktime into approximately same sized buckets
1447 Common Var(flag_lto_partition_none)
1448 Disable partioning and streaming
1450 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1451 flto-compression-level=
1452 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1453 -flto-compression-level=<number> Use zlib compression level <number> for IL
1456 Common Report Var(flag_lto_report) Init(0)
1457 Report various link-time optimization statistics
1460 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1461 Set errno after built-in math functions
1464 Common Joined RejectNegative UInteger Var(flag_max_errors)
1465 -fmax-errors=<number> Maximum number of errors to report
1468 Common Report Var(mem_report)
1469 Report on permanent memory allocation
1471 ; This will attempt to merge constant section constants, if 1 only
1472 ; string constants and constants from constant pool, if 2 also constant
1474 fmerge-all-constants
1475 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1476 Attempt to merge identical constants and constant variables
1479 Common Report Var(flag_merge_constants,1) Optimization
1480 Attempt to merge identical constants across compilation units
1482 fmerge-debug-strings
1483 Common Report Var(flag_merge_debug_strings) Init(1)
1484 Attempt to merge identical debug strings across compilation units
1487 Common RejectNegative Joined UInteger
1488 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1491 Common Report Var(flag_modulo_sched) Optimization
1492 Perform SMS based modulo scheduling before the first scheduling pass
1494 fmodulo-sched-allow-regmoves
1495 Common Report Var(flag_modulo_sched_allow_regmoves)
1496 Perform SMS based modulo scheduling with register moves allowed
1498 fmove-loop-invariants
1499 Common Report Var(flag_move_loop_invariants) Init(1) Optimization
1500 Move loop invariant computations out of loops
1503 Common Var(flag_dce) Init(1) Optimization
1504 Use the RTL dead code elimination pass
1507 Common Var(flag_dse) Init(1) Optimization
1508 Use the RTL dead store elimination pass
1510 freschedule-modulo-scheduled-loops
1511 Common Report Var(flag_resched_modulo_sched) Optimization
1512 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1514 fnon-call-exceptions
1515 Common Report Var(flag_non_call_exceptions) Optimization
1516 Support synchronous non-call exceptions
1519 Common Report Var(flag_omit_frame_pointer) Optimization
1520 When possible do not generate stack frames
1522 foptimize-register-move
1523 Common Report Var(flag_regmove) Optimization
1524 Do the full register move optimization pass
1526 foptimize-sibling-calls
1527 Common Report Var(flag_optimize_sibling_calls) Optimization
1528 Optimize sibling and tail recursive calls
1531 Common Report Var(flag_partial_inlining)
1532 Perform partial inlining
1535 Common Report Var(pre_ipa_mem_report)
1536 Report on memory allocation before interprocedural optimization
1538 fpost-ipa-mem-report
1539 Common Report Var(post_ipa_mem_report)
1540 Report on memory allocation before interprocedural optimization
1543 Common Report Var(flag_pack_struct) Optimization
1544 Pack structure members together without holes
1547 Common RejectNegative Joined UInteger Optimization
1548 -fpack-struct=<number> Set initial maximum structure member alignment
1551 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1552 Return small aggregates in memory, not registers
1555 Common Report Var(flag_peel_loops) Optimization
1556 Perform loop peeling
1559 Common Report Var(flag_no_peephole,0) Optimization
1560 Enable machine specific peephole optimizations
1563 Common Report Var(flag_peephole2) Optimization
1564 Enable an RTL peephole pass before sched2
1567 Common Report Var(flag_pic,2)
1568 Generate position-independent code if possible (large mode)
1571 Common Report Var(flag_pie,2)
1572 Generate position-independent code for executables if possible (large mode)
1575 Common Report Var(flag_pic,1)
1576 Generate position-independent code if possible (small mode)
1579 Common Report Var(flag_pie,1)
1580 Generate position-independent code for executables if possible (small mode)
1583 Common Joined RejectNegative Var(common_deferred_options) Defer
1584 Specify a plugin to load
1587 Common Joined RejectNegative Var(common_deferred_options) Defer
1588 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1590 fpredictive-commoning
1591 Common Report Var(flag_predictive_commoning) Optimization
1592 Run predictive commoning optimization.
1594 fprefetch-loop-arrays
1595 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1596 Generate prefetch instructions, if available, for arrays in loops
1599 Common Report Var(profile_flag)
1600 Enable basic program profiling code
1603 Common Report Var(profile_arc_flag)
1604 Insert arc-based program profiling code
1607 Common Joined RejectNegative Var(profile_data_prefix)
1608 Set the top-level directory for storing the profile data.
1609 The default is 'pwd'.
1612 Common Report Var(flag_profile_correction)
1613 Enable correction of flow inconsistent profile data input
1617 Enable common options for generating profile info for profile feedback directed optimizations
1620 Common Joined RejectNegative
1621 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1624 Common Var(flag_profile_use)
1625 Enable common options for performing profile feedback directed optimizations
1628 Common Joined RejectNegative
1629 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1632 Common Report Var(flag_profile_values)
1633 Insert code to profile values of expressions
1636 Common Var(common_deferred_options) Defer
1639 Common Joined RejectNegative Var(common_deferred_options) Defer
1640 -frandom-seed=<string> Make compile reproducible using <string>
1642 ; This switch causes the command line that was used to create an
1643 ; object file to be recorded into the object file. The exact format
1644 ; of this recording is target and binary file format dependent.
1645 ; It is related to the -fverbose-asm switch, but that switch only
1646 ; records information in the assembler output file as comments, so
1647 ; they never reach the object file.
1648 frecord-gcc-switches
1649 Common Report Var(flag_record_gcc_switches)
1650 Record gcc command line switches in the object file.
1653 Common Report Var(flag_pcc_struct_return,0) Optimization
1654 Return small aggregates in registers
1657 Common Report Var(flag_regmove) Optimization
1658 Enables a register move optimization
1661 Common Report Var(flag_rename_registers) Init(2) Optimization
1662 Perform a register renaming optimization pass
1665 Common Report Var(flag_reorder_blocks) Optimization
1666 Reorder basic blocks to improve code placement
1668 freorder-blocks-and-partition
1669 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1670 Reorder basic blocks and partition into hot and cold sections
1673 Common Report Var(flag_reorder_functions) Optimization
1674 Reorder functions to improve code placement
1676 frerun-cse-after-loop
1677 Common Report Var(flag_rerun_cse_after_loop) Optimization
1678 Add a common subexpression elimination pass after loop optimizations
1682 Does nothing. Preserved for backward compatibility.
1685 Common Report Var(flag_rounding_math) Optimization SetByCombined
1686 Disable optimizations that assume default FP rounding behavior
1689 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1690 Enable scheduling across basic blocks
1693 Common Report Var(flag_sched_pressure) Init(0) Optimization
1694 Enable register pressure sensitive insn scheduling
1697 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1698 Allow speculative motion of non-loads
1701 Common Report Var(flag_schedule_speculative_load) Optimization
1702 Allow speculative motion of some loads
1704 fsched-spec-load-dangerous
1705 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1706 Allow speculative motion of more loads
1709 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1710 -fsched-verbose=<number> Set the verbosity level of the scheduler
1712 fsched2-use-superblocks
1713 Common Report Var(flag_sched2_use_superblocks) Optimization
1714 If scheduling post reload, do superblock scheduling
1718 Does nothing. Preserved for backward compatibility.
1721 Common Report Var(flag_schedule_insns) Optimization
1722 Reschedule instructions before register allocation
1725 Common Report Var(flag_schedule_insns_after_reload) Optimization
1726 Reschedule instructions after register allocation
1728 ; This flag should be on when a target implements non-trivial
1729 ; scheduling hooks, maybe saving some information for its own sake.
1730 ; On IA64, for example, this is used for correct bundling.
1731 fselective-scheduling
1732 Common Report Var(flag_selective_scheduling) Optimization
1733 Schedule instructions using selective scheduling algorithm
1735 fselective-scheduling2
1736 Common Report Var(flag_selective_scheduling2) Optimization
1737 Run selective scheduling after reload
1739 fsel-sched-pipelining
1740 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1741 Perform software pipelining of inner loops during selective scheduling
1743 fsel-sched-pipelining-outer-loops
1744 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1745 Perform software pipelining of outer loops during selective scheduling
1747 fsel-sched-reschedule-pipelined
1748 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1749 Reschedule pipelined regions without pipelining
1751 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1752 ; of stalled insns into the ready list.
1753 fsched-stalled-insns
1754 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1755 Allow premature scheduling of queued insns
1757 fsched-stalled-insns=
1758 Common RejectNegative Joined UInteger
1759 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1761 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1762 ; be examined for a dependency on a stalled insn that is candidate for
1763 ; premature removal from the queue of stalled insns into the ready list (has
1764 ; an effect only if the flag 'sched_stalled_insns' is set).
1765 fsched-stalled-insns-dep
1766 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1767 Set dependence distance checking in premature scheduling of queued insns
1769 fsched-stalled-insns-dep=
1770 Common RejectNegative Joined UInteger
1771 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1773 fsched-group-heuristic
1774 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1775 Enable the group heuristic in the scheduler
1777 fsched-critical-path-heuristic
1778 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1779 Enable the critical path heuristic in the scheduler
1781 fsched-spec-insn-heuristic
1782 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1783 Enable the speculative instruction heuristic in the scheduler
1785 fsched-rank-heuristic
1786 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1787 Enable the rank heuristic in the scheduler
1789 fsched-last-insn-heuristic
1790 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1791 Enable the last instruction heuristic in the scheduler
1793 fsched-dep-count-heuristic
1794 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1795 Enable the dependent count heuristic in the scheduler
1798 Common Report Var(flag_section_anchors) Optimization
1799 Access data in the same section from shared anchor points
1803 Does nothing. Preserved for backward compatibility.
1807 Does nothing. Preserved for backward compatibility.
1810 Common Report Var(flag_ree) Init(0)
1811 Turn on Redundant Extensions Elimination pass.
1814 Common Report Var(flag_show_column) Init(1)
1815 Show column numbers in diagnostics, when available. Default on
1818 Common Report Var(flag_shrink_wrap) Optimization
1819 Emit function prologues only before parts of the function that need it,
1820 rather than at the top of the function.
1823 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1824 Disable optimizations observable by IEEE signaling NaNs
1827 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1828 Disable floating point optimizations that ignore the IEEE signedness of zero
1830 fsingle-precision-constant
1831 Common Report Var(flag_single_precision_constant) Optimization
1832 Convert floating point constants to single precision constants
1834 fsplit-ivs-in-unroller
1835 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1836 Split lifetimes of induction variables when loops are unrolled
1839 Common Report Var(flag_split_stack) Init(-1)
1840 Generate discontiguous stack frames
1843 Common Report Var(flag_split_wide_types) Optimization
1844 Split wide types into independent registers
1846 fvariable-expansion-in-unroller
1847 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1848 Apply variable expansion when loops are unrolled
1851 Common Report RejectNegative Joined
1852 -fstack-check=[no|generic|specific] Insert stack checking code into the program
1855 Common Alias(fstack-check=, specific, no)
1856 Insert stack checking code into the program. Same as -fstack-check=specific
1859 Common Var(common_deferred_options) Defer
1861 fstack-limit-register=
1862 Common RejectNegative Joined Var(common_deferred_options) Defer
1863 -fstack-limit-register=<register> Trap if the stack goes past <register>
1865 fstack-limit-symbol=
1866 Common RejectNegative Joined Var(common_deferred_options) Defer
1867 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
1870 Common Report Var(flag_stack_protect, 1)
1871 Use propolice as a stack protection method
1873 fstack-protector-all
1874 Common Report RejectNegative Var(flag_stack_protect, 2)
1875 Use a stack protection method for every function
1878 Common RejectNegative Var(flag_stack_usage)
1879 Output stack usage information on a per-function basis
1883 Does nothing. Preserved for backward compatibility.
1885 ; Nonzero if we should do (language-dependent) alias analysis.
1886 ; Typically, this analysis will assume that expressions of certain
1887 ; types do not alias expressions of certain other types. Only used
1888 ; if alias analysis (in general) is enabled.
1890 Common Report Var(flag_strict_aliasing) Optimization
1891 Assume strict aliasing rules apply
1894 Common Report Var(flag_strict_overflow)
1895 Treat signed overflow as undefined
1898 Common Report Var(flag_sync_libcalls) Init(1)
1899 Implement __atomic operations via libcalls to legacy __sync functions
1902 Common Report Var(flag_syntax_only)
1903 Check for syntax errors, then stop
1906 Common Report Var(flag_test_coverage)
1907 Create data files needed by \"gcov\"
1910 Common Report Var(flag_thread_jumps) Optimization
1911 Perform jump threading optimizations
1914 Common Report Var(time_report)
1915 Report the time taken by each compiler pass
1918 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
1919 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
1922 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
1925 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
1928 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
1931 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
1934 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
1937 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
1938 Reorder top level functions, variables, and asms
1941 Common Report Var(flag_tracer)
1942 Perform superblock formation via tail duplication
1944 ; Zero means that floating-point math operations cannot generate a
1945 ; (user-visible) trap. This is the case, for example, in nonstop
1946 ; IEEE 754 arithmetic.
1948 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
1949 Assume floating-point operations can trap
1952 Common Report Var(flag_trapv) Optimization
1953 Trap for signed overflow in addition, subtraction and multiplication
1956 Common Report Var(flag_tree_ccp) Optimization
1957 Enable SSA-CCP optimization on trees
1960 Common Report Var(flag_tree_bit_ccp) Optimization
1961 Enable SSA-BIT-CCP optimization on trees
1965 Does nothing. Preserved for backward compatibility.
1968 Common Report Var(flag_tree_ch) Optimization
1969 Enable loop header copying on trees
1971 ftree-coalesce-inlined-vars
1972 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
1973 Enable coalescing of copy-related user variables that are inlined
1976 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
1977 Enable coalescing of all copy-related user variables
1980 Common Report Var(flag_tree_copyrename) Optimization
1981 Replace SSA temporaries with better names in copies
1984 Common Report Var(flag_tree_copy_prop) Optimization
1985 Enable copy propagation on trees
1987 ftree-store-copy-prop
1989 Does nothing. Preserved for backward compatibility.
1992 Common Report Var(flag_tree_cselim) Init(2) Optimization
1993 Transform condition stores into unconditional ones
1995 ftree-switch-conversion
1996 Common Report Var(flag_tree_switch_conversion) Optimization
1997 Perform conversions of switch initializations.
2000 Common Report Var(flag_tree_dce) Optimization
2001 Enable SSA dead code elimination optimization on trees
2003 ftree-dominator-opts
2004 Common Report Var(flag_tree_dom) Optimization
2005 Enable dominator optimizations
2008 Common Report Var(flag_tree_tail_merge) Optimization
2009 Enable tail merging on trees
2012 Common Report Var(flag_tree_dse) Optimization
2013 Enable dead store elimination
2016 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2017 Enable forward propagation on trees
2020 Common Report Var(flag_tree_fre) Optimization
2021 Enable Full Redundancy Elimination (FRE) on trees
2024 Common Report Var(flag_optimize_strlen) Optimization
2025 Enable string length optimizations on trees
2027 ftree-loop-distribution
2028 Common Report Var(flag_tree_loop_distribution) Optimization
2029 Enable loop distribution on trees
2031 ftree-loop-distribute-patterns
2032 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2033 Enable loop distribution for patterns transformed into a library call
2036 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2037 Enable loop invariant motion on trees
2040 Common Alias(floop-interchange)
2041 Enable loop interchange transforms. Same as -floop-interchange
2044 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2045 Create canonical induction variables in loops
2048 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2049 Enable loop optimizations on tree level
2051 ftree-parallelize-loops=
2052 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2053 Enable automatic parallelization of loops
2056 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2057 Enable hoisting loads from conditional pointers.
2060 Common Report Var(flag_tree_pre) Optimization
2061 Enable SSA-PRE optimization on trees
2064 Common Report Var(flag_tree_partial_pre) Optimization
2065 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2068 Common Report Var(flag_tree_pta) Init(1) Optimization
2069 Perform function-local points-to analysis on trees.
2072 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2073 Enable reassociation on tree level
2077 Does nothing. Preserved for backward compatibility.
2080 Common Report Var(flag_tree_sink) Optimization
2081 Enable SSA code sinking on trees
2084 Common Report Var(flag_tree_slsr) Optimization
2085 Perform straight-line strength reduction
2088 Common Report Var(flag_tree_sra) Optimization
2089 Perform scalar replacement of aggregates
2092 Common Report Var(flag_tree_ter) Optimization
2093 Replace temporary expressions in the SSA->normal pass
2096 Common Report Var(flag_tree_live_range_split) Optimization
2097 Perform live range splitting during the SSA->normal pass
2100 Common Report Var(flag_tree_vrp) Init(0) Optimization
2101 Perform Value Range Propagation on trees
2104 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2105 Compile whole compilation unit at a time
2108 Common Report Var(flag_unroll_loops) Optimization
2109 Perform loop unrolling when iteration count is known
2112 Common Report Var(flag_unroll_all_loops) Optimization
2113 Perform loop unrolling for all loops
2115 ; Nonzero means that loop optimizer may assume that the induction variables
2116 ; that control loops do not overflow and that the loops with nontrivial
2117 ; exit condition are not infinite
2118 funsafe-loop-optimizations
2119 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2120 Allow loop optimizations to assume that the loops behave in normal way
2123 Common Report Var(flag_associative_math) SetByCombined
2124 Allow optimization for floating-point arithmetic which may change the
2125 result of the operation due to rounding.
2128 Common Report Var(flag_reciprocal_math) SetByCombined
2129 Same as -fassociative-math for expressions which include division.
2131 ; Nonzero means that unsafe floating-point math optimizations are allowed
2132 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2133 ; are allowed to assume that their arguments and results are "normal"
2134 ; (e.g., nonnegative for SQRT).
2135 funsafe-math-optimizations
2136 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2137 Allow math optimizations that may violate IEEE or ISO standards
2140 Common Report Var(flag_unswitch_loops) Optimization
2141 Perform loop unswitching
2144 Common Report Var(flag_unwind_tables) Optimization
2145 Just generate unwind tables for exception handling
2150 ; Positive if we should track variables, negative if we should run
2151 ; the var-tracking pass only to discard debug annotations, zero if
2152 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2153 ; will be set according to optimize, debug_info_level and debug_hooks
2154 ; in process_options ().
2156 Common Report Var(flag_var_tracking) Init(2) Optimization
2157 Perform variable tracking
2159 ; Positive if we should track variables at assignments, negative if
2160 ; we should run the var-tracking pass only to discard debug
2161 ; annotations. When flag_var_tracking_assignments ==
2162 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2163 fvar-tracking-assignments
2164 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2165 Perform variable tracking by annotating assignments
2167 ; Nonzero if we should toggle flag_var_tracking_assignments after
2168 ; processing options and computing its default. */
2169 fvar-tracking-assignments-toggle
2170 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2171 Toggle -fvar-tracking-assignments
2173 fvar-tracking-uninit
2174 Common Report Var(flag_var_tracking_uninit) Optimization
2175 Perform variable tracking and also tag variables that are uninitialized
2178 Common Report Var(flag_tree_vectorize) Optimization
2179 Enable loop vectorization on trees
2182 Common Report Var(flag_tree_slp_vectorize) Init(2) Optimization
2183 Enable basic block vectorization (SLP) on trees
2186 Common Report Var(flag_vect_cost_model) Optimization
2187 Enable use of cost model in vectorization
2189 ftree-vect-loop-version
2190 Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization
2191 Enable loop versioning when doing loop vectorization on trees
2193 ftree-vectorizer-verbose=
2194 Common RejectNegative Joined UInteger
2195 -ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
2198 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2199 Enable copy propagation of scalar-evolution information.
2201 ; -fverbose-asm causes extra commentary information to be produced in
2202 ; the generated assembly code (to make it more readable). This option
2203 ; is generally only of use to those who actually need to read the
2204 ; generated assembly code (perhaps while debugging the compiler itself).
2205 ; -fno-verbose-asm, the default, causes the extra information
2206 ; to not be added and is useful when comparing two assembler files.
2208 Common Report Var(flag_verbose_asm)
2209 Add extra commentary to assembler output
2212 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2213 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2216 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2219 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2222 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2225 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2228 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2231 Common Report Var(flag_value_profile_transformations) Optimization
2232 Use expression value profiles in optimizations
2235 Common Report Var(flag_web) Init(2) Optimization
2236 Construct webs and split unrelated uses of single variable
2238 ftree-builtin-call-dce
2239 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2240 Enable conditional dead code elimination for builtin calls
2243 Common Report Var(flag_whole_program) Init(0) Optimization
2244 Perform whole program optimizations
2247 Common Report Var(flag_wrapv) Optimization
2248 Assume signed arithmetic overflow wraps around
2250 fzero-initialized-in-bss
2251 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2252 Put zero initialized data in the bss section
2255 Common JoinedOrMissing
2256 Generate debug information in default format
2259 Common JoinedOrMissing Negative(gdwarf-)
2260 Generate debug information in COFF format
2263 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2264 Generate debug information in DWARF v2 (or later) format
2267 Common JoinedOrMissing
2268 Generate debug information in default extended format
2271 Common RejectNegative Var(debug_generate_pub_sections, 0) Init(-1)
2272 Don't generate DWARF pubnames and pubtypes sections.
2275 Common RejectNegative Var(debug_generate_pub_sections, 1)
2276 Generate DWARF pubnames and pubtypes sections.
2278 gno-record-gcc-switches
2279 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2280 Don't record gcc command line switches in DWARF DW_AT_producer.
2282 grecord-gcc-switches
2283 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2284 Record gcc command line switches in DWARF DW_AT_producer.
2287 Common JoinedOrMissing Negative(gstabs+)
2288 Generate debug information in STABS format
2291 Common JoinedOrMissing Negative(gvms)
2292 Generate debug information in extended STABS format
2295 Common RejectNegative Var(dwarf_strict,0) Init(0)
2296 Emit DWARF additions beyond selected version
2299 Common Report RejectNegative Var(dwarf_strict,1)
2300 Don't emit DWARF additions beyond selected version
2303 Common Report Var(flag_gtoggle)
2304 Toggle debug information generation
2307 Common JoinedOrMissing Negative(gxcoff)
2308 Generate debug information in VMS format
2311 Common JoinedOrMissing Negative(gxcoff+)
2312 Generate debug information in XCOFF format
2315 Common JoinedOrMissing Negative(gcoff)
2316 Generate debug information in extended XCOFF format
2319 Driver Joined Separate
2322 Common Joined Var(plugindir_string) Init(0)
2323 -iplugindir=<dir> Set <dir> to be the default plugin directory
2326 Driver Joined Separate
2331 no-canonical-prefixes
2344 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2345 -o <file> Place output into <file>
2348 Common Var(profile_flag)
2349 Enable function profiling
2352 Driver Var(pass_exit_codes)
2355 Common Alias(Wpedantic)
2358 Common Var(flag_pedantic_errors)
2359 Like -pedantic but issue them as errors
2365 Driver Var(use_pipes)
2368 Driver JoinedOrMissing Var(print_file_name)
2370 print-libgcc-file-name
2373 print-multi-directory
2374 Driver Var(print_multi_directory)
2377 Driver Var(print_multi_lib)
2379 print-multi-os-directory
2380 Driver Var(print_multi_os_directory)
2383 Driver JoinedOrMissing Var(print_prog_name)
2386 Driver Var(print_search_dirs)
2389 Driver Var(print_sysroot)
2391 print-sysroot-headers-suffix
2392 Driver Var(print_sysroot_headers_suffix)
2395 Common Var(quiet_flag) RejectDriver
2396 Do not display functions compiled or elapsed time
2414 Driver Var(report_times)
2417 Driver JoinedOrMissing
2420 Driver Joined Separate
2424 ; C option, but driver must not handle as "-u ndef".
2427 Common Driver Var(verbose_flag)
2428 Enable verbose output
2431 Common Var(version_flag) RejectDriver
2432 Display the compiler's version
2435 Common Var(inhibit_warnings)
2439 Driver Separate Var(wrapper_string)
2442 Driver Joined Separate
2445 Driver RejectNegative Negative(pie)
2446 Create a shared library
2452 Driver Separate Alias(specs=)
2465 ; Documented for Fortran, but always accepted by driver.
2472 ; Documented for Go, but always accepted by driver.
2478 Driver RejectNegative Negative(shared)
2479 Create a position independent executable
2482 Driver Joined Separate
2484 ; This comment is to ensure we retain the blank line above.