1 ; Options for the language- and target-independent parts of the compiler.
3 ; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
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 ; 0 means straightforward implementation of complex divide acceptable.
41 ; 1 means wide ranges of inputs must work for complex divide.
42 ; 2 means C99-like requirements for complex multiply and divide.
44 int flag_complex_method = 1
46 ; Nonzero if subexpressions must be evaluated from left-to-right.
48 int flag_evaluation_order = 0
50 ; Language specific warning pass for unused results.
52 bool flag_warn_unused_result = false
57 ; Nonzero if we should write GIMPLE bytecode for link-time optimization.
61 ; True to warn about any objects definitions whose size is larger
62 ; than N bytes. Also want about function definitions whose returned
63 ; values are larger than N bytes, where N is 'larger_than_size'.
68 HOST_WIDE_INT larger_than_size
70 ; True to warn about any function whose frame size is larger
73 bool warn_frame_larger_than
76 HOST_WIDE_INT frame_larger_than_size
78 ; Nonzero means we should be saving declaration info into a .X file.
80 int flag_gen_aux_info = 0
82 ; Nonzero if we are compiling code for a shared library, zero for
87 ; These two are really VEC(char_p,heap) *.
90 void *flag_instrument_functions_exclude_functions
93 void *flag_instrument_functions_exclude_files
95 ; Generic structs (e.g. templates not explicitly specialized)
96 ; may not have a compilation unit associated with them, and so
97 ; may need to be treated differently from ordinary structs.
99 ; Structs only handled by reference (indirectly), will also usually
100 ; not need as much debugging information.
103 enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
106 enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
108 ; True if we should exit after parsing options.
110 bool exit_after_options
112 ; Type(s) of debugging information we are producing (if any). See
113 ; flag-types.h for the definitions of the different possible types of
114 ; debugging information.
116 enum debug_info_type write_symbols = NO_DEBUG
118 ; Level of debugging information we are producing. See flag-types.h
119 ; for the definitions of the different possible levels.
121 enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
123 ; Nonzero means use GNU-only extensions in the generated symbolic
124 ; debugging information. Currently, this only has an effect when
125 ; write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG.
127 bool use_gnu_debug_info_extensions
129 ; Original value of maximum field alignment in bytes, specified via
130 ; -fpack-struct=<value>.
132 unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
135 enum vect_verbosity_levels user_vect_verbosity_level = MAX_VERBOSITY_LEVEL
137 ; Type of stack check.
139 enum stack_check_type flag_stack_check = NO_STACK_CHECK
141 ; -dA causes debug commentary information to be produced in
142 ; the generated assembly code (to make it more readable). This option
143 ; is generally only of use to those who actually need to read the
144 ; generated assembly code (perhaps while debugging the compiler itself).
145 ; Currently, this switch is only used by dwarf2out.c; however, it is intended
146 ; to be a catchall for printing debug information in the assembler file.
150 ; -dP causes the rtl to be emitted as a comment in assembly.
152 int flag_dump_rtl_in_asm
154 ; Whether -da was passed (used only in handle_common_deferred_options).
156 bool flag_dump_all_passed
158 ; Other flags saying which kinds of debugging dump have been requested.
161 int rtl_dump_and_exit
164 int flag_print_asm_name
167 enum graph_dump_types graph_dump_format = no_graph
169 ; Name of top-level original source file (what was input to cpp).
170 ; This comes from the #-command at the beginning of the actual input.
171 ; If there isn't any there, then this is the cc1 input file name.
173 const char *main_input_filename
175 ; Pointer to base name in main_input_filename, with directories and a
176 ; single final extension removed, and the length of this base
180 const char *main_input_basename
183 int main_input_baselength
185 ; Which options have been printed by --help.
189 ; Which enums have been printed by --help. 0 = not printed, no
190 ; relevant options seen, 1 = relevant option seen, not yet printed, 2
193 char *help_enum_printed
195 ; The number of columns for --help output.
197 unsigned int help_columns
199 ; Whether this options structure has been through finish_options
201 bool flag_opts_finished
213 Driver Alias(coverage)
219 Common Separate Alias(d)
222 Common Joined Alias(d)
225 Common Separate Alias(dumpbase)
228 Common Separate Alias(dumpdir)
231 Driver Separate Alias(e)
234 Driver Joined Alias(e)
237 Common Warning Alias(Wextra)
240 Driver Separate Alias(Xassembler)
243 Driver JoinedOrMissing Alias(Xassembler)
246 Driver Separate Alias(Xlinker)
249 Driver JoinedOrMissing Alias(Xlinker)
252 Driver Separate Alias(u)
255 Driver Joined Alias(u)
258 Common Driver Var(help_flag)
259 Display this information
262 Common Driver Report Joined
263 --help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params
266 Driver Separate Alias(x)
269 Driver Joined Alias(x)
272 Driver Separate Alias(L)
275 Driver Joined Alias(L)
277 -no-canonical-prefixes
278 Driver Alias(no-canonical-prefixes)
281 Driver Alias(canonical-prefixes)
283 -no-standard-libraries
284 Driver Alias(nostdlib)
293 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
296 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
299 Driver Alias(pass-exit-codes)
302 Common Alias(pedantic)
305 Common Alias(pedantic-errors)
314 Driver Separate Alias(B)
317 Driver JoinedOrMissing Alias(B)
323 Driver Separate Alias(print-file-name=)
326 Driver JoinedOrMissing Alias(print-file-name=)
328 -print-libgcc-file-name
329 Driver Alias(print-libgcc-file-name)
331 -print-multi-directory
332 Driver Alias(print-multi-directory)
335 Driver Alias(print-multi-lib)
337 -print-multi-os-directory
338 Driver Alias(print-multi-os-directory)
341 Driver Separate Alias(print-prog-name=)
344 Driver JoinedOrMissing Alias(print-prog-name=)
347 Driver Alias(print-search-dirs)
350 Driver Alias(print-sysroot)
352 -print-sysroot-headers-suffix
353 Driver Alias(print-sysroot-headers-suffix)
359 Driver Alias(save-temps)
365 Driver Separate Alias(specs=)
368 Driver Joined Alias(specs=)
374 Driver Alias(symbolic)
378 Alias for --help=target
386 ;; The driver used to convert options such as --help into forms such
387 ;; as -fhelp; the following four entries are for compatibility with
388 ;; any direct uses of those (undocumented) -f forms
390 Common Driver Alias(-help)
393 Common Driver Joined Alias(-help=)
396 Common Driver Alias(-target-help)
399 Common Driver Alias(-version)
403 --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
406 Common Joined Alias(-param)
409 Driver Separate Alias(-sysroot=)
412 Driver JoinedOrMissing
418 Driver Joined Separate
424 Driver Joined Separate
430 Common JoinedOrMissing Optimization
431 -O<number> Set optimization level to <number>
435 Optimize for space rather than speed
439 Optimize for speed disregarding exact standards compliance
451 Driver Joined Separate
457 Driver Joined Separate
469 Common RejectNegative Warning Alias(Wextra)
470 This switch is deprecated; use -Wextra instead
473 Driver JoinedOrMissing
476 Driver JoinedOrMissing
479 Driver JoinedOrMissing
482 Common Var(warn_aggregate_return) Warning
483 Warn about returning structures, unions or arrays
486 Common Var(warn_array_bounds) Warning
487 Warn if an array is accessed out of bounds
490 Common Var(warn_attributes) Init(1) Warning
491 Warn about inappropriate attribute usage
494 Common Var(warn_cast_align) Warning
495 Warn about pointer casts which increase alignment
498 Common Var(warn_cpp) Init(1) Warning
499 Warn when a #warning directive is encountered
501 Wdeprecated-declarations
502 Common Var(warn_deprecated_decl) Init(1) Warning
503 Warn about uses of __attribute__((deprecated)) declarations
505 Wdisabled-optimization
506 Common Var(warn_disabled_optimization) Warning
507 Warn when an optimization pass is disabled
510 Common Var(warnings_are_errors)
511 Treat all warnings as errors
515 Treat specified warning as error
518 Common Var(extra_warnings) Warning
519 Print extra (possibly unwanted) warnings
522 Common Var(flag_fatal_errors)
523 Exit on the first error occurred
526 Common RejectNegative Joined UInteger
527 -Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
530 Common Var(warn_inline) Warning
531 Warn when an inlined function cannot be inlined
534 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
537 Common RejectNegative Joined UInteger Warning
538 -Wlarger-than=<number> Warn if an object is larger than <number> bytes
540 Wunsafe-loop-optimizations
541 Common Var(warn_unsafe_loop_optimizations) Warning
542 Warn if the loop cannot be optimized due to nontrivial assumptions.
545 Common Var(warn_missing_noreturn) Warning
546 Warn about functions which might be candidates for __attribute__((noreturn))
549 Common Var(warn_mudflap) Init(1) Warning
550 Warn about constructs not instrumented by -fmudflap
553 Common Var(warn_overflow) Init(1) Warning
554 Warn about overflow in arithmetic expressions
557 Common Var(warn_packed) Warning
558 Warn when the packed attribute has no effect on struct layout
561 Common Var(warn_padded) Warning
562 Warn when padding is required to align structure members
565 Common Var(warn_shadow) Warning
566 Warn when one local variable shadows another
569 Common Var(warn_stack_protect) Warning
570 Warn when not issuing stack smashing protection for some reason
574 Warn about code which might break strict aliasing rules
577 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Init(-1) Warning
578 Warn about code which might break strict aliasing rules
582 Warn about optimizations that assume that signed overflow is undefined
585 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Init(-1) Warning
586 Warn about optimizations that assume that signed overflow is undefined
588 Wsuggest-attribute=const
589 Common Var(warn_suggest_attribute_const) Warning
590 Warn about functions which might be candidates for __attribute__((const))
592 Wsuggest-attribute=pure
593 Common Var(warn_suggest_attribute_pure) Warning
594 Warn about functions which might be candidates for __attribute__((pure))
596 Wsuggest-attribute=noreturn
597 Common Var(warn_suggest_attribute_noreturn) Warning
598 Warn about functions which might be candidates for __attribute__((noreturn))
601 Common Var(warn_switch) Warning
602 Warn about enumerated switches, with no default, missing a case
605 Common Var(warn_switch_default) Warning
606 Warn about enumerated switches missing a \"default:\" statement
609 Common Var(warn_switch_enum) Warning
610 Warn about all enumerated switches missing a specific case
613 Common Var(warn_system_headers) Warning
614 Do not suppress warnings from system headers
617 Common Var(warn_trampolines) Warning
618 Warn whenever a trampoline is generated
620 ; FIXME. The following -Wthread-* flags are placeholders to prevent
621 ; confusing the compiler when applications are built with these flags.
622 ; Actual support for these flags is being implemented in the
623 ; thread-annotations branch.
625 Common Var(warn_thread_safety) Warning
626 Warn about potential thread safety issues when the code is annotated with thread safety attributes
628 Wthread-unguarded-var
629 Common Var(warn_thread_unguarded_var) Init(1) Warning
630 Warn about shared variables not properly protected by locks specified in the attributes
632 Wthread-unguarded-func
633 Common Var(warn_thread_unguarded_func) Init(1) Warning
634 Warn about function calls not properly protected by locks specified in the attributes
636 Wthread-mismatched-lock-order
637 Common Var(warn_thread_mismatched_lock_order) Init(1) Warning
638 Warn about lock acquisition order inconsistent with what specified in the attributes
640 Wthread-mismatched-lock-acq-rel
641 Common Var(warn_thread_mismatched_lock_acq_rel) Init(1) Warning
642 Warn about mismatched lock acquisition and release
644 Wthread-reentrant-lock
645 Common Var(warn_thread_reentrant_lock) Init(1) Warning
646 Warn about a lock being acquired recursively
648 Wthread-unsupported-lock-name
649 Common Var(warn_unsupported_lock_name) Init(0) Warning
650 Warn about uses of unsupported lock names in attributes
653 Common Var(warn_type_limits) Init(-1) Warning
654 Warn if a comparison is always true or always false due to the limited range of the data type
657 Common Var(warn_uninitialized) Init(-1) Warning
658 Warn about 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) Init(-1) Warning
674 Warn when a variable is only set, otherwise unused
677 Common Var(warn_unused_function) Init(-1) Warning
678 Warn when a function is unused
681 Common Var(warn_unused_label) Init(-1) Warning
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) Init(-1) Warning
690 Warn when an expression value is unused
693 Common Var(warn_unused_variable) Init(-1) Warning
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
713 Common Separate Var(aux_info_file_name)
714 -aux-info <file> Emit declaration information into <file>
717 Common Joined Alias(aux-info)
720 Common Separate RejectDriver Var(aux_base_name)
723 Common Separate RejectDriver
733 -d<letters> Enable dumps from specific passes of the compiler
736 Common Separate Var(dump_base_name)
737 -dumpbase <file> Set the file basename to be used for dumps
740 Common Separate Var(dump_dir_name)
741 -dumpdir <dir> Set the directory name to be used for dumps
753 Driver Joined Separate
755 ; This option has historically been passed down to the linker by an
756 ; accident of a %{e*} spec, so ensure it continues to be passed down
757 ; as a single option. The supported option for this purpose is
758 ; -rdynamic. See PR 47390.
762 ; The version of the C++ ABI in use. The following values are allowed:
764 ; 0: The version of the ABI believed most conformant with the C++ ABI
765 ; specification. This ABI may change as bugs are discovered and fixed.
766 ; Therefore, 0 will not necessarily indicate the same ABI in different
769 ; 1: The version of the ABI first used in G++ 3.2.
771 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
773 ; 3: The version of the ABI that fixes the missing underscore
774 ; in template non-type arguments of pointer type.
776 ; 4: The version of the ABI that introduces unambiguous mangling of
777 ; vector types. First selectable in G++ 4.5.
779 ; 5: The version of the ABI that ignores attribute const/noreturn
780 ; in function pointer mangling, and corrects mangling of decltype and
781 ; function parameters used in other parameters and the return type.
782 ; First selectable in G++ 4.6.
784 ; Additional positive integers will be assigned as new versions of
785 ; the ABI become the default version of the ABI.
787 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(2)
790 Common Report Var(align_functions,0) Optimization UInteger
791 Align the start of functions
794 Common RejectNegative Joined UInteger Var(align_functions)
797 Common Report Var(align_jumps,0) Optimization UInteger
798 Align labels which are only reached by jumping
801 Common RejectNegative Joined UInteger Var(align_jumps)
804 Common Report Var(align_labels,0) Optimization UInteger
808 Common RejectNegative Joined UInteger Var(align_labels)
811 Common Report Var(align_loops,0) Optimization UInteger
812 Align the start of loops
815 Common RejectNegative Joined UInteger Var(align_loops)
819 Does nothing. Preserved for backward compatibility.
823 Does nothing. Preserved for backward compatibility.
825 fargument-noalias-global
827 Does nothing. Preserved for backward compatibility.
829 fargument-noalias-anything
831 Does nothing. Preserved for backward compatibility.
833 fasynchronous-unwind-tables
834 Common Report Var(flag_asynchronous_unwind_tables) Optimization
835 Generate unwind tables that are exact at each instruction boundary
838 Common Report Var(flag_auto_inc_dec) Init(1)
839 Generate auto-inc/dec instructions
841 ; -fcheck-bounds causes gcc to generate array bounds checks.
842 ; For C, C++ and ObjC: defaults off.
843 ; For Java: defaults to on.
844 ; For Fortran: defaults to off.
846 Common Report Var(flag_bounds_check)
847 Generate code to check bounds before indexing arrays
850 Common Report Var(flag_branch_on_count_reg) Init(1) Optimization
851 Replace add, compare, branch with branch on count register
853 fbranch-probabilities
854 Common Report Var(flag_branch_probabilities) Optimization
855 Use profiling information for branch probabilities
857 fbranch-target-load-optimize
858 Common Report Var(flag_branch_target_load_optimize) Optimization
859 Perform branch target load optimization before prologue / epilogue threading
861 fbranch-target-load-optimize2
862 Common Report Var(flag_branch_target_load_optimize2) Optimization
863 Perform branch target load optimization after prologue / epilogue threading
866 Common Report Var(flag_btr_bb_exclusive) Optimization
867 Restrict target load migration not to re-use registers in any basic block
870 Common Joined RejectNegative Var(common_deferred_options) Defer
871 -fcall-saved-<register> Mark <register> as being preserved across functions
874 Common Joined RejectNegative Var(common_deferred_options) Defer
875 -fcall-used-<register> Mark <register> as being corrupted by function calls
877 ; Nonzero for -fcaller-saves: allocate values in regs that need to
878 ; be saved across function calls, if that produces overall better code.
879 ; Optional now, so people can test it.
881 Common Report Var(flag_caller_saves) Optimization
882 Save registers around function calls
885 Common Report Var(flag_check_data_deps)
886 Compare the results of several data dependence analyzers.
888 fcombine-stack-adjustments
889 Common Report Var(flag_combine_stack_adjustments) Optimization
890 Looks for opportunities to reduce stack adjustments and stack references.
893 Common Report Var(flag_no_common,0) Optimization
894 Do not put uninitialized globals in the common section
898 ; Converted by the driver to -fcompare-debug= options.
901 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
902 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
904 fcompare-debug-second
905 Common Driver RejectNegative Var(flag_compare_debug)
906 Run only the second compilation of -fcompare-debug
909 Common Report Var(flag_compare_elim_after_reload) Optimization
910 Perform comparison elimination after register allocation has finished
913 Common Var(flag_conserve_stack) Optimization
914 Do not perform optimizations increasing noticeably stack usage
917 Common Report Var(flag_cprop_registers) Optimization
918 Perform a register copy-propagation optimization pass
921 Common Report Var(flag_crossjumping) Optimization
922 Perform cross-jumping optimization
925 Common Report Var(flag_cse_follow_jumps) Optimization
926 When running CSE, follow jumps to their targets
930 Does nothing. Preserved for backward compatibility.
933 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
934 Omit range reduction step when performing complex division
937 Common Report Var(flag_cx_fortran_rules) Optimization
938 Complex multiplication and division follow Fortran rules
941 Common Report Var(flag_data_sections) Optimization
942 Place data items into their own section
945 Common Report Var(common_deferred_options) Defer
946 List all available debugging counters with their limits and counts.
949 Common RejectNegative Joined Var(common_deferred_options) Defer
950 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
953 Common Joined RejectNegative Var(common_deferred_options) Defer
954 Map one directory name to another in debug information
956 ; Nonzero for -fdefer-pop: don't pop args after each function call
957 ; instead save them up to pop many calls' args with one insns.
959 Common Report Var(flag_defer_pop) Optimization
960 Defer popping functions args from stack until later
963 Common Report Var(flag_delayed_branch) Optimization
964 Attempt to fill delay slots of branch instructions
966 fdelete-null-pointer-checks
967 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
968 Delete useless null pointer checks
971 Common Report Var(flag_devirtualize) Optimization
972 Try to convert virtual calls to direct ones.
974 fdiagnostics-show-location=
975 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
976 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
978 ; Required for these enum values.
983 Name(diagnostic_prefixing_rule) Type(int)
986 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
989 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
991 fdiagnostics-show-option
992 Common Var(flag_diagnostics_show_option) Init(1)
993 Amend appropriate diagnostic messages with the command line option that controls them
996 Common Joined RejectNegative Var(common_deferred_options) Defer
997 -fdump-<type> Dump various compiler internals to a file
1000 Driver RejectNegative
1003 Common RejectNegative Joined Var(flag_dump_final_insns)
1004 -fdump-final-insns=filename Dump to filename the insns at the end of translation
1007 Common RejectNegative Joined Var(flag_dump_go_spec)
1008 -fdump-go-spec=filename Write all declarations to file as Go code
1011 Common Report Var(flag_dump_noaddr)
1012 Suppress output of addresses in debugging dumps
1015 Common Report Var(flag_dump_unnumbered)
1016 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1018 fdump-unnumbered-links
1019 Common Report Var(flag_dump_unnumbered_links)
1020 Suppress output of previous and next insn numbers in debugging dumps
1023 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1024 Enable CFI tables via GAS assembler directives.
1027 Common Report Var(flag_early_inlining) Init(1) Optimization
1028 Perform early inlining
1030 feliminate-dwarf2-dups
1031 Common Report Var(flag_eliminate_dwarf2_dups)
1032 Perform DWARF2 duplicate elimination
1035 Common Report Var(flag_ipa_sra) Init(0) Optimization
1036 Perform interprocedural reduction of aggregates
1038 feliminate-unused-debug-symbols
1039 Common Report Var(flag_debug_only_used_symbols)
1040 Perform unused type elimination in debug info
1042 feliminate-unused-debug-types
1043 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1044 Perform unused type elimination in debug info
1046 femit-class-debug-always
1047 Common Report Var(flag_emit_class_debug_always) Init(0)
1048 Do not suppress C++ class debug information.
1051 Common Report Var(flag_enable_icf_debug)
1052 Generate debug information to support Identical Code Folding (ICF)
1055 Common Report Var(flag_exceptions) Optimization
1056 Enable exception handling
1058 fexpensive-optimizations
1059 Common Report Var(flag_expensive_optimizations) Optimization
1060 Perform a number of minor, expensive optimizations
1063 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1064 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1067 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1070 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1073 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1079 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1080 Assume no NaNs or infinities are generated
1083 Common Joined RejectNegative Var(common_deferred_options) Defer
1084 -ffixed-<register> Mark <register> as being unavailable to the compiler
1087 Common Report Var(flag_float_store) Optimization
1088 Don't allocate floats and doubles in extended-precision registers
1092 Does nothing. Preserved for backward compatibility.
1095 Common Report Var(flag_forward_propagate) Optimization
1096 Perform a forward propagation pass on RTL
1099 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1100 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1103 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1106 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1108 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1110 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1113 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1115 ; Nonzero means don't put addresses of constant functions in registers.
1116 ; Used for compiling the Unix kernel, where strange substitutions are
1117 ; done on the assembly output.
1119 Common Report Var(flag_no_function_cse,0)
1120 Allow function addresses to be held in registers
1123 Common Report Var(flag_function_sections)
1124 Place each function into its own section
1127 Common Report Var(flag_gcse) Optimization
1128 Perform global common subexpression elimination
1131 Common Report Var(flag_gcse_lm) Init(1) Optimization
1132 Perform enhanced load motion during global common subexpression elimination
1135 Common Report Var(flag_gcse_sm) Init(0) Optimization
1136 Perform store motion after global common subexpression elimination
1139 Common Report Var(flag_gcse_las) Init(0) Optimization
1140 Perform redundant load after store elimination in global common subexpression
1144 Common Report Var(flag_gcse_after_reload) Optimization
1145 Perform global common subexpression elimination after register allocation
1148 ; This option is not documented yet as its semantics will change.
1150 Common Report Var(flag_graphite)
1151 Enable in and out of Graphite representation
1154 Common Report Var(flag_graphite_identity) Optimization
1155 Enable Graphite Identity transformation
1157 floop-parallelize-all
1158 Common Report Var(flag_loop_parallelize_all) Optimization
1159 Mark all loops as parallel
1162 Common Report Var(flag_loop_strip_mine) Optimization
1163 Enable Loop Strip Mining transformation
1166 Common Report Var(flag_loop_interchange) Optimization
1167 Enable Loop Interchange transformation
1170 Common Report Var(flag_loop_block) Optimization
1171 Enable Loop Blocking transformation
1174 Common Report Var(flag_loop_flatten) Optimization
1175 Enable Loop Flattening transformation
1177 fstrict-volatile-bitfields
1178 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1179 Force bitfield accesses to match their type width
1181 fguess-branch-probability
1182 Common Report Var(flag_guess_branch_prob) Optimization
1183 Enable guessing of branch probabilities
1185 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1186 ; Generate position-independent code for executables if possible
1187 ; On SVR4 targets, it also controls whether or not to emit a
1188 ; string identifying the compiler.
1190 Common Report Var(flag_no_ident,0)
1191 Process #ident directives
1194 Common Report Var(flag_if_conversion) Optimization
1195 Perform conversion of conditional jumps to branchless equivalents
1198 Common Report Var(flag_if_conversion2) Optimization
1199 Perform conversion of conditional jumps to conditional execution
1201 ftree-loop-if-convert
1202 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1203 Convert conditional jumps in innermost loops to branchless equivalents
1205 ftree-loop-if-convert-stores
1206 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1207 Also if-convert conditional jumps containing memory writes
1209 ; -finhibit-size-directive inhibits output of .size for ELF.
1210 ; This is used only for compiling crtstuff.c,
1211 ; and it may be extended to other effects
1212 ; needed for crtstuff.c on other systems.
1213 finhibit-size-directive
1214 Common Report Var(flag_inhibit_size_directive)
1215 Do not generate .size directives
1218 Common Report Var(flag_indirect_inlining)
1219 Perform indirect inlining
1221 ; Nonzero means that functions declared `inline' will be treated
1222 ; as `static'. Prevents generation of zillions of copies of unused
1223 ; static inline functions; instead, `inlines' are written out
1224 ; only when actually used. Used in conjunction with -g. Also
1225 ; does the right thing with #pragma interface.
1227 Common Report Var(flag_no_inline,0) Init(0)
1228 Pay attention to the \"inline\" keyword
1230 finline-small-functions
1231 Common Report Var(flag_inline_small_functions) Optimization
1232 Integrate simple functions into their callers when code size is known to not growth
1235 Common Report Var(flag_inline_functions) Optimization
1236 Integrate simple functions into their callers
1238 finline-functions-called-once
1239 Common Report Var(flag_inline_functions_called_once) Init(1) Optimization
1240 Integrate functions called once into their callers
1243 Common RejectNegative Joined Alias(finline-limit=)
1246 Common RejectNegative Joined UInteger
1247 -finline-limit=<number> Limit the size of inlined functions to <number>
1249 finstrument-functions
1250 Common Report Var(flag_instrument_function_entry_exit)
1251 Instrument function entry and exit with profiling calls
1253 finstrument-functions-exclude-function-list=
1254 Common RejectNegative Joined
1255 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1257 finstrument-functions-exclude-file-list=
1258 Common RejectNegative Joined
1259 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1262 Common Report Var(flag_ipa_cp) Optimization
1263 Perform Interprocedural constant propagation
1266 Common Report Var(flag_ipa_cp_clone) Optimization
1267 Perform cloning to make Interprocedural constant propagation stronger
1270 Common Report Var(flag_ipa_profile) Init(0) Optimization
1271 Perform interprocedural profile propagation
1274 Common Report Var(flag_ipa_pta) Init(0) Optimization
1275 Perform interprocedural points-to analysis
1278 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1279 Discover pure and const functions
1282 Common Report Var(flag_ipa_reference) Init(0) Optimization
1283 Discover readonly and non addressable static variables
1286 Common Report Var(flag_ipa_matrix_reorg) Optimization
1287 Perform matrix layout flattening and transposing based
1288 on profiling information.
1291 Common Report Var(flag_ipa_struct_reorg)
1292 Perform structure layout optimizations based
1293 on profiling information.
1296 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1297 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1300 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1303 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1306 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1309 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_MIXED)
1310 -fira-region=[one|all|mixed] Set regions for IRA
1313 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1316 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1319 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1322 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1325 Common Report Var(flag_ira_loop_pressure)
1326 Use IRA based register pressure calculation
1327 in RTL loop optimizations.
1329 fira-share-save-slots
1330 Common Report Var(flag_ira_share_save_slots) Init(1)
1331 Share slots for saving different hard registers.
1333 fira-share-spill-slots
1334 Common Report Var(flag_ira_share_spill_slots) Init(1)
1335 Share stack slots for spilled pseudo-registers.
1338 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1339 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1342 Common Report Var(flag_ivopts) Init(1) Optimization
1343 Optimize induction variables on trees
1346 Common Var(flag_jump_tables) Init(1) Optimization
1347 Use jump tables for sufficiently large switch statements
1349 fkeep-inline-functions
1350 Common Report Var(flag_keep_inline_functions)
1351 Generate code for functions even if they are fully inlined
1354 Common Report Var(flag_keep_static_consts) Init(1)
1355 Emit static const variables even if they are not used
1358 Common Report Var(flag_leading_underscore) Init(-1)
1359 Give external symbols a leading underscore
1363 Does nothing. Preserved for backward compatibility.
1367 Enable link-time optimization.
1370 Common RejectNegative Joined Var(flag_lto)
1371 Link-time optimization with number of parallel jobs or jobserver.
1374 Common Var(flag_lto_partition_1to1)
1375 Partition functions and vars at linktime based on object files they originate from
1377 flto-partition=balanced
1378 Common Var(flag_lto_partition_balanced)
1379 Partition functions and vars at linktime into approximately same sized buckets
1382 Common Var(flag_lto_partition_none)
1383 Disable partioning and streaming
1385 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1386 flto-compression-level=
1387 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1388 -flto-compression-level=<number> Use zlib compression level <number> for IL
1391 Common Report Var(flag_lto_report) Init(0) Optimization
1392 Report various link-time optimization statistics
1395 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1396 Set errno after built-in math functions
1399 Common Joined RejectNegative UInteger Var(flag_max_errors)
1400 -fmax-errors=<number> Maximum number of errors to report
1403 Common Report Var(mem_report)
1404 Report on permanent memory allocation
1406 ; This will attempt to merge constant section constants, if 1 only
1407 ; string constants and constants from constant pool, if 2 also constant
1409 fmerge-all-constants
1410 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1411 Attempt to merge identical constants and constant variables
1414 Common Report Var(flag_merge_constants,1) Optimization
1415 Attempt to merge identical constants across compilation units
1417 fmerge-debug-strings
1418 Common Report Var(flag_merge_debug_strings) Init(1)
1419 Attempt to merge identical debug strings across compilation units
1422 Common RejectNegative Joined UInteger
1423 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1426 Common Report Var(flag_modulo_sched) Optimization
1427 Perform SMS based modulo scheduling before the first scheduling pass
1429 fmodulo-sched-allow-regmoves
1430 Common Report Var(flag_modulo_sched_allow_regmoves)
1431 Perform SMS based modulo scheduling with register moves allowed
1433 fmove-loop-invariants
1434 Common Report Var(flag_move_loop_invariants) Init(1) Optimization
1435 Move loop invariant computations out of loops
1438 Common RejectNegative Report Var(flag_mudflap)
1439 Add mudflap bounds-checking instrumentation for single-threaded program
1442 Common RejectNegative Report Var(flag_mudflap,2)
1443 Add mudflap bounds-checking instrumentation for multi-threaded program
1446 Common RejectNegative Report Var(flag_mudflap_ignore_reads)
1447 Ignore read operations when inserting mudflap instrumentation
1450 Common Var(flag_dce) Init(1) Optimization
1451 Use the RTL dead code elimination pass
1454 Common Var(flag_dse) Init(1) Optimization
1455 Use the RTL dead store elimination pass
1457 freschedule-modulo-scheduled-loops
1458 Common Report Var(flag_resched_modulo_sched) Optimization
1459 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1461 fnon-call-exceptions
1462 Common Report Var(flag_non_call_exceptions) Optimization
1463 Support synchronous non-call exceptions
1466 Common Report Var(flag_omit_frame_pointer) Optimization
1467 When possible do not generate stack frames
1469 foptimize-register-move
1470 Common Report Var(flag_regmove) Optimization
1471 Do the full register move optimization pass
1473 foptimize-sibling-calls
1474 Common Report Var(flag_optimize_sibling_calls) Optimization
1475 Optimize sibling and tail recursive calls
1478 Common Report Var(flag_partial_inlining)
1479 Perform partial inlining
1482 Common Report Var(pre_ipa_mem_report)
1483 Report on memory allocation before interprocedural optimization
1485 fpost-ipa-mem-report
1486 Common Report Var(post_ipa_mem_report)
1487 Report on memory allocation before interprocedural optimization
1490 Common Report Var(flag_pack_struct) Optimization
1491 Pack structure members together without holes
1494 Common RejectNegative Joined UInteger Optimization
1495 -fpack-struct=<number> Set initial maximum structure member alignment
1498 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1499 Return small aggregates in memory, not registers
1502 Common Report Var(flag_peel_loops) Optimization
1503 Perform loop peeling
1506 Common Report Var(flag_no_peephole,0) Optimization
1507 Enable machine specific peephole optimizations
1510 Common Report Var(flag_peephole2) Optimization
1511 Enable an RTL peephole pass before sched2
1514 Common Report Var(flag_pic,2)
1515 Generate position-independent code if possible (large mode)
1518 Common Report Var(flag_pie,2)
1519 Generate position-independent code for executables if possible (large mode)
1522 Common Report Var(flag_pic,1)
1523 Generate position-independent code if possible (small mode)
1526 Common Report Var(flag_pie,1)
1527 Generate position-independent code for executables if possible (small mode)
1530 Common Joined RejectNegative Var(common_deferred_options) Defer
1531 Specify a plugin to load
1534 Common Joined RejectNegative Var(common_deferred_options) Defer
1535 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1537 fpredictive-commoning
1538 Common Report Var(flag_predictive_commoning) Optimization
1539 Run predictive commoning optimization.
1541 fprefetch-loop-arrays
1542 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1543 Generate prefetch instructions, if available, for arrays in loops
1546 Common Report Var(profile_flag)
1547 Enable basic program profiling code
1550 Common Report Var(profile_arc_flag)
1551 Insert arc-based program profiling code
1554 Common Joined RejectNegative Var(profile_data_prefix)
1555 Set the top-level directory for storing the profile data.
1556 The default is 'pwd'.
1559 Common Report Var(flag_profile_correction)
1560 Enable correction of flow inconsistent profile data input
1564 Enable common options for generating profile info for profile feedback directed optimizations
1567 Common Joined RejectNegative
1568 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1571 Common Var(flag_profile_use)
1572 Enable common options for performing profile feedback directed optimizations
1575 Common Joined RejectNegative
1576 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1579 Common Report Var(flag_profile_values)
1580 Insert code to profile values of expressions
1583 Common Var(common_deferred_options) Defer
1586 Common Joined RejectNegative Var(common_deferred_options) Defer
1587 -frandom-seed=<string> Make compile reproducible using <string>
1589 ; This switch causes the command line that was used to create an
1590 ; object file to be recorded into the object file. The exact format
1591 ; of this recording is target and binary file format dependent.
1592 ; It is related to the -fverbose-asm switch, but that switch only
1593 ; records information in the assembler output file as comments, so
1594 ; they never reach the object file.
1595 frecord-gcc-switches
1596 Common Report Var(flag_record_gcc_switches)
1597 Record gcc command line switches in the object file.
1600 Common Report Var(flag_pcc_struct_return,0) Optimization
1601 Return small aggregates in registers
1604 Common Report Var(flag_regmove) Optimization
1605 Enables a register move optimization
1608 Common Report Var(flag_rename_registers) Init(2) Optimization
1609 Perform a register renaming optimization pass
1612 Common Report Var(flag_reorder_blocks) Optimization
1613 Reorder basic blocks to improve code placement
1615 freorder-blocks-and-partition
1616 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1617 Reorder basic blocks and partition into hot and cold sections
1620 Common Report Var(flag_reorder_functions) Optimization
1621 Reorder functions to improve code placement
1623 frerun-cse-after-loop
1624 Common Report Var(flag_rerun_cse_after_loop) Optimization
1625 Add a common subexpression elimination pass after loop optimizations
1629 Does nothing. Preserved for backward compatibility.
1632 Common Report Var(flag_rounding_math) Optimization SetByCombined
1633 Disable optimizations that assume default FP rounding behavior
1636 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1637 Enable scheduling across basic blocks
1640 Common Report Var(flag_sched_pressure) Init(0) Optimization
1641 Enable register pressure sensitive insn scheduling
1644 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1645 Allow speculative motion of non-loads
1648 Common Report Var(flag_schedule_speculative_load) Optimization
1649 Allow speculative motion of some loads
1651 fsched-spec-load-dangerous
1652 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1653 Allow speculative motion of more loads
1656 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1657 -fsched-verbose=<number> Set the verbosity level of the scheduler
1659 fsched2-use-superblocks
1660 Common Report Var(flag_sched2_use_superblocks) Optimization
1661 If scheduling post reload, do superblock scheduling
1665 Does nothing. Preserved for backward compatibility.
1668 Common Report Var(flag_schedule_insns) Optimization
1669 Reschedule instructions before register allocation
1672 Common Report Var(flag_schedule_insns_after_reload) Optimization
1673 Reschedule instructions after register allocation
1675 ; This flag should be on when a target implements non-trivial
1676 ; scheduling hooks, maybe saving some information for its own sake.
1677 ; On IA64, for example, this is used for correct bundling.
1678 fselective-scheduling
1679 Common Report Var(flag_selective_scheduling) Optimization
1680 Schedule instructions using selective scheduling algorithm
1682 fselective-scheduling2
1683 Common Report Var(flag_selective_scheduling2) Optimization
1684 Run selective scheduling after reload
1686 fsel-sched-pipelining
1687 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1688 Perform software pipelining of inner loops during selective scheduling
1690 fsel-sched-pipelining-outer-loops
1691 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1692 Perform software pipelining of outer loops during selective scheduling
1694 fsel-sched-reschedule-pipelined
1695 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1696 Reschedule pipelined regions without pipelining
1698 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1699 ; of stalled insns into the ready list.
1700 fsched-stalled-insns
1701 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1702 Allow premature scheduling of queued insns
1704 fsched-stalled-insns=
1705 Common RejectNegative Joined UInteger
1706 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1708 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1709 ; be examined for a dependency on a stalled insn that is candidate for
1710 ; premature removal from the queue of stalled insns into the ready list (has
1711 ; an effect only if the flag 'sched_stalled_insns' is set).
1712 fsched-stalled-insns-dep
1713 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1714 Set dependence distance checking in premature scheduling of queued insns
1716 fsched-stalled-insns-dep=
1717 Common RejectNegative Joined UInteger
1718 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1720 fsched-group-heuristic
1721 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1722 Enable the group heuristic in the scheduler
1724 fsched-critical-path-heuristic
1725 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1726 Enable the critical path heuristic in the scheduler
1728 fsched-spec-insn-heuristic
1729 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1730 Enable the speculative instruction heuristic in the scheduler
1732 fsched-rank-heuristic
1733 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1734 Enable the rank heuristic in the scheduler
1736 fsched-last-insn-heuristic
1737 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1738 Enable the last instruction heuristic in the scheduler
1740 fsched-dep-count-heuristic
1741 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1742 Enable the dependent count heuristic in the scheduler
1745 Common Report Var(flag_section_anchors) Optimization
1746 Access data in the same section from shared anchor points
1750 Does nothing. Preserved for backward compatibility.
1753 Common Report Var(flag_zee) Init(0)
1754 Eliminate redundant zero extensions on targets that support implicit extensions.
1757 Common Report Var(flag_show_column) Init(1)
1758 Show column numbers in diagnostics, when available. Default on
1761 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1762 Disable optimizations observable by IEEE signaling NaNs
1765 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1766 Disable floating point optimizations that ignore the IEEE signedness of zero
1768 fsingle-precision-constant
1769 Common Report Var(flag_single_precision_constant) Optimization
1770 Convert floating point constants to single precision constants
1772 fsplit-ivs-in-unroller
1773 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1774 Split lifetimes of induction variables when loops are unrolled
1777 Common Report Var(flag_split_stack) Init(-1)
1778 Generate discontiguous stack frames
1781 Common Report Var(flag_split_wide_types) Optimization
1782 Split wide types into independent registers
1784 fvariable-expansion-in-unroller
1785 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1786 Apply variable expansion when loops are unrolled
1789 Common Report RejectNegative Joined
1790 -fstack-check=[no|generic|specific] Insert stack checking code into the program
1793 Common Alias(fstack-check=, specific, no)
1794 Insert stack checking code into the program. Same as -fstack-check=specific
1797 Common Var(common_deferred_options) Defer
1799 fstack-limit-register=
1800 Common RejectNegative Joined Var(common_deferred_options) Defer
1801 -fstack-limit-register=<register> Trap if the stack goes past <register>
1803 fstack-limit-symbol=
1804 Common RejectNegative Joined Var(common_deferred_options) Defer
1805 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
1808 Common Report Var(flag_stack_protect, 1)
1809 Use propolice as a stack protection method
1811 fstack-protector-all
1812 Common Report RejectNegative Var(flag_stack_protect, 2)
1813 Use a stack protection method for every function
1816 Common RejectNegative Var(flag_stack_usage)
1817 Output stack usage information on a per-function basis
1821 Does nothing. Preserved for backward compatibility.
1823 ; Nonzero if we should do (language-dependent) alias analysis.
1824 ; Typically, this analysis will assume that expressions of certain
1825 ; types do not alias expressions of certain other types. Only used
1826 ; if alias analysis (in general) is enabled.
1828 Common Report Var(flag_strict_aliasing) Optimization
1829 Assume strict aliasing rules apply
1832 Common Report Var(flag_strict_overflow)
1833 Treat signed overflow as undefined
1836 Common Report Var(flag_syntax_only)
1837 Check for syntax errors, then stop
1840 Common Report Var(flag_test_coverage)
1841 Create data files needed by \"gcov\"
1844 Common Report Var(flag_thread_jumps) Optimization
1845 Perform jump threading optimizations
1848 Common Report Var(time_report)
1849 Report the time taken by each compiler pass
1852 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
1853 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
1856 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
1859 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
1862 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
1865 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
1868 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
1871 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
1872 Reorder top level functions, variables, and asms
1875 Common Report Var(flag_tracer)
1876 Perform superblock formation via tail duplication
1878 ; Zero means that floating-point math operations cannot generate a
1879 ; (user-visible) trap. This is the case, for example, in nonstop
1880 ; IEEE 754 arithmetic.
1882 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
1883 Assume floating-point operations can trap
1886 Common Report Var(flag_trapv) Optimization
1887 Trap for signed overflow in addition, subtraction and multiplication
1890 Common Report Var(flag_tree_ccp) Optimization
1891 Enable SSA-CCP optimization on trees
1894 Common Report Var(flag_tree_bit_ccp) Optimization
1895 Enable SSA-BIT-CCP optimization on trees
1899 Does nothing. Preserved for backward compatibility.
1902 Common Report Var(flag_tree_ch) Optimization
1903 Enable loop header copying on trees
1906 Common Report Var(flag_tree_copyrename) Optimization
1907 Replace SSA temporaries with better names in copies
1910 Common Report Var(flag_tree_copy_prop) Optimization
1911 Enable copy propagation on trees
1913 ftree-store-copy-prop
1915 Does nothing. Preserved for backward compatibility.
1918 Common Report Var(flag_tree_cselim) Init(2) Optimization
1919 Transform condition stores into unconditional ones
1921 ftree-switch-conversion
1922 Common Report Var(flag_tree_switch_conversion) Optimization
1923 Perform conversions of switch initializations.
1926 Common Report Var(flag_tree_dce) Optimization
1927 Enable SSA dead code elimination optimization on trees
1929 ftree-dominator-opts
1930 Common Report Var(flag_tree_dom) Optimization
1931 Enable dominator optimizations
1934 Common Report Var(flag_tree_dse) Optimization
1935 Enable dead store elimination
1938 Common Report Var(flag_tree_forwprop) Init(1) Optimization
1939 Enable forward propagation on trees
1942 Common Report Var(flag_tree_fre) Optimization
1943 Enable Full Redundancy Elimination (FRE) on trees
1945 ftree-loop-distribution
1946 Common Report Var(flag_tree_loop_distribution) Optimization
1947 Enable loop distribution on trees
1949 ftree-loop-distribute-patterns
1950 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
1951 Enable loop distribution for patterns transformed into a library call
1954 Common Report Var(flag_tree_loop_im) Init(1) Optimization
1955 Enable loop invariant motion on trees
1958 Common Alias(floop-interchange)
1959 Enable loop interchange transforms. Same as -floop-interchange
1962 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
1963 Create canonical induction variables in loops
1966 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
1967 Enable loop optimizations on tree level
1969 ftree-parallelize-loops=
1970 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
1971 Enable automatic parallelization of loops
1974 Common Report Var(flag_tree_phiprop) Init(1) Optimization
1975 Enable hoisting loads from conditional pointers.
1978 Common Report Var(flag_tree_pre) Optimization
1979 Enable SSA-PRE optimization on trees
1982 Common Report Var(flag_tree_pta) Init(1) Optimization
1983 Perform function-local points-to analysis on trees.
1986 Common Report Var(flag_tree_reassoc) Init(1) Optimization
1987 Enable reassociation on tree level
1991 Does nothing. Preserved for backward compatibility.
1994 Common Report Var(flag_tree_sink) Optimization
1995 Enable SSA code sinking on trees
1998 Common Report Var(flag_tree_sra) Optimization
1999 Perform scalar replacement of aggregates
2002 Common Report Var(flag_tree_ter) Optimization
2003 Replace temporary expressions in the SSA->normal pass
2006 Common Report Var(flag_tree_live_range_split) Optimization
2007 Perform live range splitting during the SSA->normal pass
2010 Common Report Var(flag_tree_vrp) Init(0) Optimization
2011 Perform Value Range Propagation on trees
2013 fstrict-enum-precision
2014 Common Report Var(flag_strict_enum_precision) Init(1) Optimization
2015 Perform transformations based on enum precision
2018 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2019 Compile whole compilation unit at a time
2022 Common Report Var(flag_unroll_loops) Optimization
2023 Perform loop unrolling when iteration count is known
2026 Common Report Var(flag_unroll_all_loops) Optimization
2027 Perform loop unrolling for all loops
2029 ; Nonzero means that loop optimizer may assume that the induction variables
2030 ; that control loops do not overflow and that the loops with nontrivial
2031 ; exit condition are not infinite
2032 funsafe-loop-optimizations
2033 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2034 Allow loop optimizations to assume that the loops behave in normal way
2037 Common Report Var(flag_associative_math) SetByCombined
2038 Allow optimization for floating-point arithmetic which may change the
2039 result of the operation due to rounding.
2042 Common Report Var(flag_reciprocal_math) SetByCombined
2043 Same as -fassociative-math for expressions which include division.
2045 ; Nonzero means that unsafe floating-point math optimizations are allowed
2046 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2047 ; are allowed to assume that their arguments and results are "normal"
2048 ; (e.g., nonnegative for SQRT).
2049 funsafe-math-optimizations
2050 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2051 Allow math optimizations that may violate IEEE or ISO standards
2054 Common Report Var(flag_unswitch_loops) Optimization
2055 Perform loop unswitching
2058 Common Report Var(flag_unwind_tables) Optimization
2059 Just generate unwind tables for exception handling
2064 ; Positive if we should track variables, negative if we should run
2065 ; the var-tracking pass only to discard debug annotations, zero if
2066 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2067 ; will be set according to optimize, debug_info_level and debug_hooks
2068 ; in process_options ().
2070 Common Report Var(flag_var_tracking) Init(2) Optimization
2071 Perform variable tracking
2073 ; Positive if we should track variables at assignments, negative if
2074 ; we should run the var-tracking pass only to discard debug
2075 ; annotations. When flag_var_tracking_assignments ==
2076 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2077 fvar-tracking-assignments
2078 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2079 Perform variable tracking by annotating assignments
2081 ; Nonzero if we should toggle flag_var_tracking_assignments after
2082 ; processing options and computing its default. */
2083 fvar-tracking-assignments-toggle
2084 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2085 Toggle -fvar-tracking-assignments
2087 fvar-tracking-uninit
2088 Common Report Var(flag_var_tracking_uninit) Optimization
2089 Perform variable tracking and also tag variables that are uninitialized
2092 Common Report Var(flag_tree_vectorize) Optimization
2093 Enable loop vectorization on trees
2096 Common Report Var(flag_tree_slp_vectorize) Init(2) Optimization
2097 Enable basic block vectorization (SLP) on trees
2100 Common Report Var(flag_vect_cost_model) Optimization
2101 Enable use of cost model in vectorization
2103 ftree-vect-loop-version
2104 Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization
2105 Enable loop versioning when doing loop vectorization on trees
2107 ftree-vectorizer-verbose=
2108 Common RejectNegative Joined UInteger
2109 -ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
2112 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2113 Enable copy propagation of scalar-evolution information.
2115 ; -fverbose-asm causes extra commentary information to be produced in
2116 ; the generated assembly code (to make it more readable). This option
2117 ; is generally only of use to those who actually need to read the
2118 ; generated assembly code (perhaps while debugging the compiler itself).
2119 ; -fno-verbose-asm, the default, causes the extra information
2120 ; to not be added and is useful when comparing two assembler files.
2122 Common Report Var(flag_verbose_asm)
2123 Add extra commentary to assembler output
2126 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2127 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2130 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2133 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2136 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2139 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2142 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2145 Common Report Var(flag_value_profile_transformations) Optimization
2146 Use expression value profiles in optimizations
2149 Common Report Var(flag_web) Init(2) Optimization
2150 Construct webs and split unrelated uses of single variable
2152 ftree-builtin-call-dce
2153 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2154 Enable conditional dead code elimination for builtin calls
2157 Common Report Var(flag_whole_program) Init(0) Optimization
2158 Perform whole program optimizations
2161 Common Report Var(flag_wrapv) Optimization
2162 Assume signed arithmetic overflow wraps around
2164 fzero-initialized-in-bss
2165 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2166 Put zero initialized data in the bss section
2169 Common JoinedOrMissing
2170 Generate debug information in default format
2173 Common JoinedOrMissing Negative(gdwarf-)
2174 Generate debug information in COFF format
2177 Common Joined UInteger Var(dwarf_version) Init(2) Negative(gstabs)
2178 Generate debug information in DWARF v2 (or later) format
2181 Common JoinedOrMissing
2182 Generate debug information in default extended format
2185 Common JoinedOrMissing Negative(gstabs+)
2186 Generate debug information in STABS format
2189 Common JoinedOrMissing Negative(gvms)
2190 Generate debug information in extended STABS format
2193 Common RejectNegative Var(dwarf_strict,0) Init(-1)
2194 Emit DWARF additions beyond selected version
2197 Common Report RejectNegative Var(dwarf_strict,1)
2198 Don't emit DWARF additions beyond selected version
2201 Common Report Var(flag_gtoggle)
2202 Toggle debug information generation
2205 Common JoinedOrMissing Negative(gxcoff)
2206 Generate debug information in VMS format
2209 Common JoinedOrMissing Negative(gxcoff+)
2210 Generate debug information in XCOFF format
2213 Common JoinedOrMissing Negative(gcoff)
2214 Generate debug information in extended XCOFF format
2217 Driver Joined Separate
2220 Common Joined Var(plugindir_string) Init(0)
2221 -iplugindir=<dir> Set <dir> to be the default plugin directory
2224 Driver Joined Separate
2229 no-canonical-prefixes
2245 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2246 -o <file> Place output into <file>
2249 Common Var(profile_flag)
2250 Enable function profiling
2253 Driver Var(pass_exit_codes)
2256 Common Var(pedantic)
2257 Issue warnings needed for strict compliance to the standard
2260 Common Var(flag_pedantic_errors)
2261 Like -pedantic but issue them as errors
2267 Driver Var(use_pipes)
2270 Driver JoinedOrMissing Var(print_file_name)
2272 print-libgcc-file-name
2275 print-multi-directory
2276 Driver Var(print_multi_directory)
2279 Driver Var(print_multi_lib)
2281 print-multi-os-directory
2282 Driver Var(print_multi_os_directory)
2285 Driver JoinedOrMissing Var(print_prog_name)
2288 Driver Var(print_search_dirs)
2291 Driver Var(print_sysroot)
2293 print-sysroot-headers-suffix
2294 Driver Var(print_sysroot_headers_suffix)
2297 Common Var(quiet_flag) RejectDriver
2298 Do not display functions compiled or elapsed time
2316 Driver Var(report_times)
2319 Driver JoinedOrMissing
2322 Driver Joined Separate
2326 ; C option, but driver must not handle as "-u ndef".
2329 Common Driver Var(verbose_flag)
2330 Enable verbose output
2333 Common Var(version_flag) RejectDriver
2334 Display the compiler's version
2337 Common Var(inhibit_warnings)
2341 Driver Separate Var(wrapper_string)
2344 Driver Joined Separate
2347 Common RejectNegative Negative(pie)
2348 Create a shared library
2354 Driver Separate Alias(specs=)
2367 ; Documented for Fortran, but always accepted by driver.
2374 ; Documented for Go, but always accepted by driver.
2380 Common RejectNegative Negative(shared)
2381 Create a position independent executable
2384 Driver Joined Separate
2386 ; This comment is to ensure we retain the blank line above.