1 ; Options for the language- and target-independent parts of the compiler.
3 ; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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 ; 0 means straightforward implementation of complex divide acceptable.
36 ; 1 means wide ranges of inputs must work for complex divide.
37 ; 2 means C99-like requirements for complex multiply and divide.
39 int flag_complex_method = 1
41 ; Nonzero if subexpressions must be evaluated from left-to-right.
43 int flag_evaluation_order = 0
45 ; Language specific warning pass for unused results.
47 bool flag_warn_unused_result = false
52 ; Nonzero if we should write GIMPLE bytecode for link-time optimization.
56 ; True to warn about any objects definitions whose size is larger
57 ; than N bytes. Also want about function definitions whose returned
58 ; values are larger than N bytes, where N is 'larger_than_size'.
63 HOST_WIDE_INT larger_than_size
65 ; True to warn about any function whose frame size is larger
68 bool warn_frame_larger_than
71 HOST_WIDE_INT frame_larger_than_size
73 ; Nonzero means we should be saving declaration info into a .X file.
75 int flag_gen_aux_info = 0
77 ; Nonzero if we are compiling code for a shared library, zero for
82 ; These two are really VEC(char_p,heap) *.
85 void *flag_instrument_functions_exclude_functions
88 void *flag_instrument_functions_exclude_files
90 ; Generic structs (e.g. templates not explicitly specialized)
91 ; may not have a compilation unit associated with them, and so
92 ; may need to be treated differently from ordinary structs.
94 ; Structs only handled by reference (indirectly), will also usually
95 ; not need as much debugging information.
98 enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
101 enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
103 ; True if we should exit after parsing options.
105 bool exit_after_options
107 ; Type(s) of debugging information we are producing (if any). See
108 ; flag-types.h for the definitions of the different possible types of
109 ; debugging information.
111 enum debug_info_type write_symbols = NO_DEBUG
113 ; Level of debugging information we are producing. See flag-types.h
114 ; for the definitions of the different possible levels.
116 enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
118 ; Nonzero means use GNU-only extensions in the generated symbolic
119 ; debugging information. Currently, this only has an effect when
120 ; write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG.
122 bool use_gnu_debug_info_extensions
124 ; Original value of maximum field alignment in bytes, specified via
125 ; -fpack-struct=<value>.
127 unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
130 enum vect_verbosity_levels user_vect_verbosity_level = MAX_VERBOSITY_LEVEL
132 ; -dA causes debug commentary information to be produced in
133 ; the generated assembly code (to make it more readable). This option
134 ; is generally only of use to those who actually need to read the
135 ; generated assembly code (perhaps while debugging the compiler itself).
136 ; Currently, this switch is only used by dwarf2out.c; however, it is intended
137 ; to be a catchall for printing debug information in the assembler file.
141 ; -dP causes the rtl to be emitted as a comment in assembly.
143 int flag_dump_rtl_in_asm
145 ; Whether -da was passed (used only in handle_common_deferred_options).
147 bool flag_dump_all_passed
149 ; Other flags saying which kinds of debugging dump have been requested.
152 int rtl_dump_and_exit
155 int flag_print_asm_name
158 enum graph_dump_types graph_dump_format = no_graph
160 ; Name of top-level original source file (what was input to cpp).
161 ; This comes from the #-command at the beginning of the actual input.
162 ; If there isn't any there, then this is the cc1 input file name.
164 const char *main_input_filename
166 ; Pointer to base name in main_input_filename, with directories and a
167 ; single final extension removed, and the length of this base
171 const char *main_input_basename
174 int main_input_baselength
176 ; Which options have been printed by --help.
180 ; Which enums have been printed by --help. 0 = not printed, no
181 ; relevant options seen, 1 = relevant option seen, not yet printed, 2
184 char *help_enum_printed
186 ; The number of columns for --help output.
188 unsigned int help_columns
190 ; Whether this options structure has been through finish_options
192 bool flag_opts_finished
204 Driver Alias(coverage)
210 Common Separate Alias(d)
213 Common Joined Alias(d)
216 Common Separate Alias(dumpbase)
219 Common Separate Alias(dumpdir)
222 Driver Separate Alias(e)
225 Driver Joined Alias(e)
228 Common Warning Alias(Wextra)
231 Driver Separate Alias(Xassembler)
234 Driver JoinedOrMissing Alias(Xassembler)
237 Driver Separate Alias(Xlinker)
240 Driver JoinedOrMissing Alias(Xlinker)
243 Driver Separate Alias(u)
246 Driver Joined Alias(u)
249 Common Driver Var(help_flag)
250 Display this information
253 Common Driver Report Joined
254 --help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params
257 Driver Separate Alias(x)
260 Driver Joined Alias(x)
263 Driver Separate Alias(L)
266 Driver Joined Alias(L)
268 -no-canonical-prefixes
269 Driver Alias(no-canonical-prefixes)
271 -no-standard-libraries
272 Driver Alias(nostdlib)
281 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
284 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
287 Driver Alias(pass-exit-codes)
290 Common Alias(pedantic)
293 Common Alias(pedantic-errors)
302 Driver Separate Alias(B)
305 Driver JoinedOrMissing Alias(B)
311 Driver Separate Alias(print-file-name=)
314 Driver JoinedOrMissing Alias(print-file-name=)
316 -print-libgcc-file-name
317 Driver Alias(print-libgcc-file-name)
319 -print-multi-directory
320 Driver Alias(print-multi-directory)
323 Driver Alias(print-multi-lib)
325 -print-multi-os-directory
326 Driver Alias(print-multi-os-directory)
329 Driver Separate Alias(print-prog-name=)
332 Driver JoinedOrMissing Alias(print-prog-name=)
335 Driver Alias(print-search-dirs)
338 Driver Alias(print-sysroot)
340 -print-sysroot-headers-suffix
341 Driver Alias(print-sysroot-headers-suffix)
347 Driver Alias(save-temps)
353 Driver Separate Alias(specs=)
356 Driver Joined Alias(specs=)
362 Driver Alias(symbolic)
366 Alias for --help=target
374 ;; The driver used to convert options such as --help into forms such
375 ;; as -fhelp; the following four entries are for compatibility with
376 ;; any direct uses of those (undocumented) -f forms
378 Common Driver Alias(-help)
381 Common Driver Joined Alias(-help=)
384 Common Driver Alias(-target-help)
387 Common Driver Alias(-version)
391 --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
394 Common Joined Alias(-param)
397 Driver Separate Alias(-sysroot=)
400 Driver JoinedOrMissing
406 Driver Joined Separate
412 Driver Joined Separate
415 Common JoinedOrMissing Optimization
416 -O<number> Set optimization level to <number>
420 Optimize for space rather than speed
424 Optimize for speed disregarding exact standards compliance
427 Driver Joined Separate
433 Driver Joined Separate
445 Common RejectNegative Warning Alias(Wextra)
446 This switch is deprecated; use -Wextra instead
449 Driver JoinedOrMissing
452 Driver JoinedOrMissing
455 Driver JoinedOrMissing
458 Common Var(warn_aggregate_return) Warning
459 Warn about returning structures, unions or arrays
462 Common Var(warn_array_bounds) Warning
463 Warn if an array is accessed out of bounds
466 Common Var(warn_attributes) Init(1) Warning
467 Warn about inappropriate attribute usage
470 Common Var(warn_cast_align) Warning
471 Warn about pointer casts which increase alignment
474 Common Var(warn_cpp) Init(1) Warning
475 Warn when a #warning directive is encountered
477 Wdeprecated-declarations
478 Common Var(warn_deprecated_decl) Init(1) Warning
479 Warn about uses of __attribute__((deprecated)) declarations
481 Wdisabled-optimization
482 Common Var(warn_disabled_optimization) Warning
483 Warn when an optimization pass is disabled
486 Common Var(warnings_are_errors)
487 Treat all warnings as errors
491 Treat specified warning as error
494 Common Var(extra_warnings) Warning
495 Print extra (possibly unwanted) warnings
498 Common Var(flag_fatal_errors)
499 Exit on the first error occurred
502 Common RejectNegative Joined UInteger
503 -Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
506 Common Var(warn_inline) Warning
507 Warn when an inlined function cannot be inlined
510 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
513 Common RejectNegative Joined UInteger Warning
514 -Wlarger-than=<number> Warn if an object is larger than <number> bytes
516 Wunsafe-loop-optimizations
517 Common Var(warn_unsafe_loop_optimizations) Warning
518 Warn if the loop cannot be optimized due to nontrivial assumptions.
521 Common Var(warn_missing_noreturn) Warning
522 Warn about functions which might be candidates for __attribute__((noreturn))
525 Common Var(warn_mudflap) Init(1) Warning
526 Warn about constructs not instrumented by -fmudflap
529 Common Var(warn_overflow) Init(1) Warning
530 Warn about overflow in arithmetic expressions
533 Common Var(warn_packed) Warning
534 Warn when the packed attribute has no effect on struct layout
537 Common Var(warn_padded) Warning
538 Warn when padding is required to align structure members
541 Common Var(warn_shadow) Warning
542 Warn when one local variable shadows another
545 Common Var(warn_stack_protect) Warning
546 Warn when not issuing stack smashing protection for some reason
550 Warn about code which might break strict aliasing rules
553 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Init(-1) Warning
554 Warn about code which might break strict aliasing rules
558 Warn about optimizations that assume that signed overflow is undefined
561 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Init(-1) Warning
562 Warn about optimizations that assume that signed overflow is undefined
564 Wsuggest-attribute=const
565 Common Var(warn_suggest_attribute_const) Warning
566 Warn about functions which might be candidates for __attribute__((const))
568 Wsuggest-attribute=pure
569 Common Var(warn_suggest_attribute_pure) Warning
570 Warn about functions which might be candidates for __attribute__((pure))
572 Wsuggest-attribute=noreturn
573 Common Var(warn_suggest_attribute_noreturn) Warning
574 Warn about functions which might be candidates for __attribute__((noreturn))
577 Common Var(warn_switch) Warning
578 Warn about enumerated switches, with no default, missing a case
581 Common Var(warn_switch_default) Warning
582 Warn about enumerated switches missing a \"default:\" statement
585 Common Var(warn_switch_enum) Warning
586 Warn about all enumerated switches missing a specific case
589 Common Var(warn_system_headers) Warning
590 Do not suppress warnings from system headers
593 Common Var(warn_trampolines) Warning
594 Warn whenever a trampoline is generated
597 Common Var(warn_type_limits) Init(-1) Warning
598 Warn if a comparison is always true or always false due to the limited range of the data type
601 Common Var(warn_uninitialized) Init(-1) Warning
602 Warn about uninitialized automatic variables
606 Does nothing. Preserved for backward compatibility.
609 Common Var(warn_unused) Init(0) Warning
610 Enable all -Wunused- warnings
612 Wunused-but-set-parameter
613 Common Var(warn_unused_but_set_parameter) Init(-1) Warning
614 Warn when a function parameter is only set, otherwise unused
616 Wunused-but-set-variable
617 Common Var(warn_unused_but_set_variable) Init(-1) Warning
618 Warn when a variable is only set, otherwise unused
621 Common Var(warn_unused_function) Init(-1) Warning
622 Warn when a function is unused
625 Common Var(warn_unused_label) Init(-1) Warning
626 Warn when a label is unused
629 Common Var(warn_unused_parameter) Init(-1) Warning
630 Warn when a function parameter is unused
633 Common Var(warn_unused_value) Init(-1) Warning
634 Warn when an expression value is unused
637 Common Var(warn_unused_variable) Init(-1) Warning
638 Warn when a variable is unused
641 Common Var(warn_coverage_mismatch) Init(1) Warning
642 Warn in case profiles in -fprofile-use do not match
654 Common Separate Var(aux_info_file_name)
655 -aux-info <file> Emit declaration information into <file>
658 Common Joined Alias(aux-info)
661 Common Separate RejectDriver Var(aux_base_name)
664 Common Separate RejectDriver
674 -d<letters> Enable dumps from specific passes of the compiler
677 Common Separate Var(dump_base_name)
678 -dumpbase <file> Set the file basename to be used for dumps
681 Common Separate Var(dump_dir_name)
682 -dumpdir <dir> Set the directory name to be used for dumps
694 Driver Joined Separate
696 ; The version of the C++ ABI in use. The following values are allowed:
698 ; 0: The version of the ABI believed most conformant with the C++ ABI
699 ; specification. This ABI may change as bugs are discovered and fixed.
700 ; Therefore, 0 will not necessarily indicate the same ABI in different
703 ; 1: The version of the ABI first used in G++ 3.2.
705 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
707 ; 3: The version of the ABI that fixes the missing underscore
708 ; in template non-type arguments of pointer type.
710 ; 4: The version of the ABI that introduces unambiguous mangling of
713 ; Additional positive integers will be assigned as new versions of
714 ; the ABI become the default version of the ABI.
716 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(2)
719 Common Report Var(align_functions,0) Optimization UInteger
720 Align the start of functions
723 Common RejectNegative Joined UInteger Var(align_functions)
726 Common Report Var(align_jumps,0) Optimization UInteger
727 Align labels which are only reached by jumping
730 Common RejectNegative Joined UInteger Var(align_jumps)
733 Common Report Var(align_labels,0) Optimization UInteger
737 Common RejectNegative Joined UInteger Var(align_labels)
740 Common Report Var(align_loops,0) Optimization UInteger
741 Align the start of loops
744 Common RejectNegative Joined UInteger Var(align_loops)
748 Does nothing. Preserved for backward compatibility.
752 Does nothing. Preserved for backward compatibility.
754 fargument-noalias-global
756 Does nothing. Preserved for backward compatibility.
758 fargument-noalias-anything
760 Does nothing. Preserved for backward compatibility.
762 fasynchronous-unwind-tables
763 Common Report Var(flag_asynchronous_unwind_tables) Optimization
764 Generate unwind tables that are exact at each instruction boundary
767 Common Report Var(flag_auto_inc_dec) Init(1)
768 Generate auto-inc/dec instructions
770 ; -fcheck-bounds causes gcc to generate array bounds checks.
771 ; For C, C++ and ObjC: defaults off.
772 ; For Java: defaults to on.
773 ; For Fortran: defaults to off.
775 Common Report Var(flag_bounds_check)
776 Generate code to check bounds before indexing arrays
779 Common Report Var(flag_branch_on_count_reg) Init(1) Optimization
780 Replace add, compare, branch with branch on count register
782 fbranch-probabilities
783 Common Report Var(flag_branch_probabilities) Optimization
784 Use profiling information for branch probabilities
786 fbranch-target-load-optimize
787 Common Report Var(flag_branch_target_load_optimize) Optimization
788 Perform branch target load optimization before prologue / epilogue threading
790 fbranch-target-load-optimize2
791 Common Report Var(flag_branch_target_load_optimize2) Optimization
792 Perform branch target load optimization after prologue / epilogue threading
795 Common Report Var(flag_btr_bb_exclusive) Optimization
796 Restrict target load migration not to re-use registers in any basic block
799 Common Joined RejectNegative Var(common_deferred_options) Defer
800 -fcall-saved-<register> Mark <register> as being preserved across functions
803 Common Joined RejectNegative Var(common_deferred_options) Defer
804 -fcall-used-<register> Mark <register> as being corrupted by function calls
806 ; Nonzero for -fcaller-saves: allocate values in regs that need to
807 ; be saved across function calls, if that produces overall better code.
808 ; Optional now, so people can test it.
810 Common Report Var(flag_caller_saves) Optimization
811 Save registers around function calls
814 Common Report Var(flag_check_data_deps)
815 Compare the results of several data dependence analyzers.
817 fcombine-stack-adjustments
818 Common Report Var(flag_combine_stack_adjustments) Optimization
819 Looks for opportunities to reduce stack adjustments and stack references.
822 Common Report Var(flag_no_common,0) Optimization
823 Do not put uninitialized globals in the common section
827 ; Converted by the driver to -fcompare-debug= options.
830 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
831 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
833 fcompare-debug-second
834 Common Driver RejectNegative
835 Run only the second compilation of -fcompare-debug
838 Common Var(flag_conserve_stack) Optimization
839 Do not perform optimizations increasing noticeably stack usage
842 Common Report Var(flag_cprop_registers) Optimization
843 Perform a register copy-propagation optimization pass
846 Common Report Var(flag_crossjumping) Optimization
847 Perform cross-jumping optimization
850 Common Report Var(flag_cse_follow_jumps) Optimization
851 When running CSE, follow jumps to their targets
855 Does nothing. Preserved for backward compatibility.
858 Common Report Var(flag_cx_limited_range) Optimization
859 Omit range reduction step when performing complex division
862 Common Report Var(flag_cx_fortran_rules) Optimization
863 Complex multiplication and division follow Fortran rules
866 Common Report Var(flag_data_sections) Optimization
867 Place data items into their own section
870 Common Report Var(common_deferred_options) Defer
871 List all available debugging counters with their limits and counts.
874 Common RejectNegative Joined Var(common_deferred_options) Defer
875 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
878 Common Joined RejectNegative Var(common_deferred_options) Defer
879 Map one directory name to another in debug information
881 ; Nonzero for -fdefer-pop: don't pop args after each function call
882 ; instead save them up to pop many calls' args with one insns.
884 Common Report Var(flag_defer_pop) Optimization
885 Defer popping functions args from stack until later
888 Common Report Var(flag_delayed_branch) Optimization
889 Attempt to fill delay slots of branch instructions
891 fdelete-null-pointer-checks
892 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
893 Delete useless null pointer checks
895 fdiagnostics-show-location=
896 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
897 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
899 ; Required for these enum values.
904 Name(diagnostic_prefixing_rule) Type(int)
907 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
910 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
912 fdiagnostics-show-option
913 Common Var(flag_diagnostics_show_option) Init(1)
914 Amend appropriate diagnostic messages with the command line option that controls them
917 Common Joined RejectNegative Var(common_deferred_options) Defer
918 -fdump-<type> Dump various compiler internals to a file
921 Driver RejectNegative
924 Common RejectNegative Joined Var(flag_dump_final_insns)
925 -fdump-final-insns=filename Dump to filename the insns at the end of translation
928 Common RejectNegative Joined Var(flag_dump_go_spec)
929 -fdump-go-spec=filename Write all declarations to file as Go code
932 Common Report Var(flag_dump_noaddr)
933 Suppress output of addresses in debugging dumps
936 Common Report Var(flag_dump_unnumbered)
937 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
939 fdump-unnumbered-links
940 Common Report Var(flag_dump_unnumbered_links)
941 Suppress output of previous and next insn numbers in debugging dumps
944 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
945 Enable CFI tables via GAS assembler directives.
948 Common Report Var(flag_early_inlining) Init(1) Optimization
949 Perform early inlining
951 feliminate-dwarf2-dups
952 Common Report Var(flag_eliminate_dwarf2_dups)
953 Perform DWARF2 duplicate elimination
956 Common Report Var(flag_ipa_sra) Init(0) Optimization
957 Perform interprocedural reduction of aggregates
959 feliminate-unused-debug-symbols
960 Common Report Var(flag_debug_only_used_symbols)
961 Perform unused type elimination in debug info
963 feliminate-unused-debug-types
964 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
965 Perform unused type elimination in debug info
967 femit-class-debug-always
968 Common Report Var(flag_emit_class_debug_always) Init(0)
969 Do not suppress C++ class debug information.
972 Common Report Var(flag_enable_icf_debug)
973 Generate debug information to support Identical Code Folding (ICF)
976 Common Report Var(flag_exceptions) Optimization
977 Enable exception handling
979 fexpensive-optimizations
980 Common Report Var(flag_expensive_optimizations) Optimization
981 Perform a number of minor, expensive optimizations
984 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
985 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
988 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
991 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
994 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1000 Common Report Var(flag_finite_math_only) Optimization
1001 Assume no NaNs or infinities are generated
1004 Common Joined RejectNegative Var(common_deferred_options) Defer
1005 -ffixed-<register> Mark <register> as being unavailable to the compiler
1008 Common Report Var(flag_float_store) Optimization
1009 Don't allocate floats and doubles in extended-precision registers
1013 Does nothing. Preserved for backward compatibility.
1016 Common Report Var(flag_forward_propagate) Optimization
1017 Perform a forward propagation pass on RTL
1020 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1021 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1024 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1027 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1029 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1031 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1034 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1036 ; Nonzero means don't put addresses of constant functions in registers.
1037 ; Used for compiling the Unix kernel, where strange substitutions are
1038 ; done on the assembly output.
1040 Common Report Var(flag_no_function_cse,0)
1041 Allow function addresses to be held in registers
1044 Common Report Var(flag_function_sections)
1045 Place each function into its own section
1048 Common Report Var(flag_gcse) Optimization
1049 Perform global common subexpression elimination
1052 Common Report Var(flag_gcse_lm) Init(1) Optimization
1053 Perform enhanced load motion during global common subexpression elimination
1056 Common Report Var(flag_gcse_sm) Init(0) Optimization
1057 Perform store motion after global common subexpression elimination
1060 Common Report Var(flag_gcse_las) Init(0) Optimization
1061 Perform redundant load after store elimination in global common subexpression
1065 Common Report Var(flag_gcse_after_reload) Optimization
1066 Perform global common subexpression elimination after register allocation
1069 ; This option is not documented yet as its semantics will change.
1071 Common Report Var(flag_graphite)
1072 Enable in and out of Graphite representation
1075 Common Report Var(flag_graphite_identity) Optimization
1076 Enable Graphite Identity transformation
1078 floop-parallelize-all
1079 Common Report Var(flag_loop_parallelize_all) Optimization
1080 Mark all loops as parallel
1083 Common Report Var(flag_loop_strip_mine) Optimization
1084 Enable Loop Strip Mining transformation
1087 Common Report Var(flag_loop_interchange) Optimization
1088 Enable Loop Interchange transformation
1091 Common Report Var(flag_loop_block) Optimization
1092 Enable Loop Blocking transformation
1095 Common Report Var(flag_loop_flatten) Optimization
1096 Enable Loop Flattening transformation
1098 fstrict-volatile-bitfields
1099 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1100 Force bitfield accesses to match their type width
1102 fguess-branch-probability
1103 Common Report Var(flag_guess_branch_prob) Optimization
1104 Enable guessing of branch probabilities
1106 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1107 ; Generate position-independent code for executables if possible
1108 ; On SVR4 targets, it also controls whether or not to emit a
1109 ; string identifying the compiler.
1111 Common Report Var(flag_no_ident,0)
1112 Process #ident directives
1115 Common Report Var(flag_if_conversion) Optimization
1116 Perform conversion of conditional jumps to branchless equivalents
1119 Common Report Var(flag_if_conversion2) Optimization
1120 Perform conversion of conditional jumps to conditional execution
1122 ftree-loop-if-convert
1123 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1124 Convert conditional jumps in innermost loops to branchless equivalents
1126 ftree-loop-if-convert-stores
1127 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1128 Also if-convert conditional jumps containing memory writes
1130 ; -finhibit-size-directive inhibits output of .size for ELF.
1131 ; This is used only for compiling crtstuff.c,
1132 ; and it may be extended to other effects
1133 ; needed for crtstuff.c on other systems.
1134 finhibit-size-directive
1135 Common Report Var(flag_inhibit_size_directive)
1136 Do not generate .size directives
1139 Common Report Var(flag_indirect_inlining)
1140 Perform indirect inlining
1142 ; Nonzero means that functions declared `inline' will be treated
1143 ; as `static'. Prevents generation of zillions of copies of unused
1144 ; static inline functions; instead, `inlines' are written out
1145 ; only when actually used. Used in conjunction with -g. Also
1146 ; does the right thing with #pragma interface.
1148 Common Report Var(flag_no_inline,0) Init(0)
1149 Pay attention to the \"inline\" keyword
1151 finline-small-functions
1152 Common Report Var(flag_inline_small_functions) Optimization
1153 Integrate simple functions into their callers when code size is known to not growth
1156 Common Report Var(flag_inline_functions) Optimization
1157 Integrate simple functions into their callers
1159 finline-functions-called-once
1160 Common Report Var(flag_inline_functions_called_once) Init(1) Optimization
1161 Integrate functions called once into their callers
1164 Common RejectNegative Joined Alias(finline-limit=)
1167 Common RejectNegative Joined UInteger
1168 -finline-limit=<number> Limit the size of inlined functions to <number>
1170 finstrument-functions
1171 Common Report Var(flag_instrument_function_entry_exit)
1172 Instrument function entry and exit with profiling calls
1174 finstrument-functions-exclude-function-list=
1175 Common RejectNegative Joined
1176 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1178 finstrument-functions-exclude-file-list=
1179 Common RejectNegative Joined
1180 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1183 Common Report Var(flag_ipa_cp) Optimization
1184 Perform Interprocedural constant propagation
1187 Common Report Var(flag_ipa_cp_clone) Optimization
1188 Perform cloning to make Interprocedural constant propagation stronger
1191 Common Report Var(flag_ipa_profile) Init(0) Optimization
1192 Perform interprocedural profile propagation
1195 Common Report Var(flag_ipa_pta) Init(0) Optimization
1196 Perform interprocedural points-to analysis
1199 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1200 Discover pure and const functions
1203 Common Report Var(flag_ipa_reference) Init(0) Optimization
1204 Discover readonly and non addressable static variables
1207 Common Report Var(flag_ipa_matrix_reorg) Optimization
1208 Perform matrix layout flattening and transposing based
1209 on profiling information.
1212 Common Report Var(flag_ipa_struct_reorg)
1213 Perform structure layout optimizations based
1214 on profiling information.
1217 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1218 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1221 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1224 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1227 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1230 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_MIXED)
1231 -fira-region=[one|all|mixed] Set regions for IRA
1234 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1237 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1240 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1243 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1246 Common Report Var(flag_ira_loop_pressure)
1247 Use IRA based register pressure calculation
1248 in RTL loop optimizations.
1250 fira-share-save-slots
1251 Common Report Var(flag_ira_share_save_slots) Init(1)
1252 Share slots for saving different hard registers.
1254 fira-share-spill-slots
1255 Common Report Var(flag_ira_share_spill_slots) Init(1)
1256 Share stack slots for spilled pseudo-registers.
1259 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1260 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1263 Common Report Var(flag_ivopts) Init(1) Optimization
1264 Optimize induction variables on trees
1267 Common Var(flag_jump_tables) Init(1) Optimization
1268 Use jump tables for sufficiently large switch statements
1270 fkeep-inline-functions
1271 Common Report Var(flag_keep_inline_functions)
1272 Generate code for functions even if they are fully inlined
1275 Common Report Var(flag_keep_static_consts) Init(1)
1276 Emit static const variables even if they are not used
1279 Common Report Var(flag_leading_underscore) Init(-1)
1280 Give external symbols a leading underscore
1284 Does nothing. Preserved for backward compatibility.
1288 Enable link-time optimization.
1291 Common RejectNegative Joined Var(flag_lto)
1292 Link-time optimization with number of parallel jobs or jobserver.
1295 Common Var(flag_lto_partition_1to1)
1296 Partition functions and vars at linktime based on object files they originate from
1298 flto-partition=balanced
1299 Common Var(flag_lto_partition_balanced)
1300 Partition functions and vars at linktime into approximately same sized buckets
1303 Common Var(flag_lto_partition_none)
1304 Disable partioning and streaming
1306 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1307 flto-compression-level=
1308 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1309 -flto-compression-level=<number> Use zlib compression level <number> for IL
1312 Common Report Var(flag_lto_report) Init(0) Optimization
1313 Report various link-time optimization statistics
1316 Common Report Var(flag_errno_math) Init(1) Optimization
1317 Set errno after built-in math functions
1320 Common Joined RejectNegative UInteger Var(flag_max_errors)
1321 -fmax-errors=<number> Maximum number of errors to report
1324 Common Report Var(mem_report)
1325 Report on permanent memory allocation
1327 ; This will attempt to merge constant section constants, if 1 only
1328 ; string constants and constants from constant pool, if 2 also constant
1330 fmerge-all-constants
1331 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1332 Attempt to merge identical constants and constant variables
1335 Common Report Var(flag_merge_constants,1) Optimization
1336 Attempt to merge identical constants across compilation units
1338 fmerge-debug-strings
1339 Common Report Var(flag_merge_debug_strings) Init(1)
1340 Attempt to merge identical debug strings across compilation units
1343 Common RejectNegative Joined UInteger
1344 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1347 Common Report Var(flag_modulo_sched) Optimization
1348 Perform SMS based modulo scheduling before the first scheduling pass
1350 fmodulo-sched-allow-regmoves
1351 Common Report Var(flag_modulo_sched_allow_regmoves)
1352 Perform SMS based modulo scheduling with register moves allowed
1354 fmove-loop-invariants
1355 Common Report Var(flag_move_loop_invariants) Init(1) Optimization
1356 Move loop invariant computations out of loops
1359 Common RejectNegative Report Var(flag_mudflap)
1360 Add mudflap bounds-checking instrumentation for single-threaded program
1363 Common RejectNegative Report Var(flag_mudflap,2)
1364 Add mudflap bounds-checking instrumentation for multi-threaded program
1367 Common RejectNegative Report Var(flag_mudflap_ignore_reads)
1368 Ignore read operations when inserting mudflap instrumentation
1371 Common Var(flag_dce) Init(1) Optimization
1372 Use the RTL dead code elimination pass
1375 Common Var(flag_dse) Init(1) Optimization
1376 Use the RTL dead store elimination pass
1378 freschedule-modulo-scheduled-loops
1379 Common Report Var(flag_resched_modulo_sched) Optimization
1380 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1382 fnon-call-exceptions
1383 Common Report Var(flag_non_call_exceptions) Optimization
1384 Support synchronous non-call exceptions
1387 Common Report Var(flag_omit_frame_pointer) Optimization
1388 When possible do not generate stack frames
1390 foptimize-register-move
1391 Common Report Var(flag_regmove) Optimization
1392 Do the full register move optimization pass
1394 foptimize-sibling-calls
1395 Common Report Var(flag_optimize_sibling_calls) Optimization
1396 Optimize sibling and tail recursive calls
1399 Common Report Var(flag_partial_inlining)
1400 Perform partial inlining
1403 Common Report Var(pre_ipa_mem_report)
1404 Report on memory allocation before interprocedural optimization
1406 fpost-ipa-mem-report
1407 Common Report Var(post_ipa_mem_report)
1408 Report on memory allocation before interprocedural optimization
1411 Common Report Var(flag_pack_struct) Optimization
1412 Pack structure members together without holes
1415 Common RejectNegative Joined UInteger Optimization
1416 -fpack-struct=<number> Set initial maximum structure member alignment
1419 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1420 Return small aggregates in memory, not registers
1423 Common Report Var(flag_peel_loops) Optimization
1424 Perform loop peeling
1427 Common Report Var(flag_no_peephole,0) Optimization
1428 Enable machine specific peephole optimizations
1431 Common Report Var(flag_peephole2) Optimization
1432 Enable an RTL peephole pass before sched2
1435 Common Report Var(flag_pic,2)
1436 Generate position-independent code if possible (large mode)
1439 Common Report Var(flag_pie,2)
1440 Generate position-independent code for executables if possible (large mode)
1443 Common Report Var(flag_pic,1)
1444 Generate position-independent code if possible (small mode)
1447 Common Report Var(flag_pie,1)
1448 Generate position-independent code for executables if possible (small mode)
1451 Common Joined RejectNegative Var(common_deferred_options) Defer
1452 Specify a plugin to load
1455 Common Joined RejectNegative Var(common_deferred_options) Defer
1456 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1458 fpredictive-commoning
1459 Common Report Var(flag_predictive_commoning) Optimization
1460 Run predictive commoning optimization.
1462 fprefetch-loop-arrays
1463 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1464 Generate prefetch instructions, if available, for arrays in loops
1467 Common Report Var(profile_flag)
1468 Enable basic program profiling code
1471 Common Report Var(profile_arc_flag)
1472 Insert arc-based program profiling code
1475 Common Joined RejectNegative Var(profile_data_prefix)
1476 Set the top-level directory for storing the profile data.
1477 The default is 'pwd'.
1480 Common Report Var(flag_profile_correction)
1481 Enable correction of flow inconsistent profile data input
1485 Enable common options for generating profile info for profile feedback directed optimizations
1488 Common Joined RejectNegative
1489 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1492 Common Var(flag_profile_use)
1493 Enable common options for performing profile feedback directed optimizations
1496 Common Joined RejectNegative
1497 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1500 Common Report Var(flag_profile_values)
1501 Insert code to profile values of expressions
1504 Common Var(common_deferred_options) Defer
1507 Common Joined RejectNegative Var(common_deferred_options) Defer
1508 -frandom-seed=<string> Make compile reproducible using <string>
1510 ; This switch causes the command line that was used to create an
1511 ; object file to be recorded into the object file. The exact format
1512 ; of this recording is target and binary file format dependent.
1513 ; It is related to the -fverbose-asm switch, but that switch only
1514 ; records information in the assembler output file as comments, so
1515 ; they never reach the object file.
1516 frecord-gcc-switches
1517 Common Report Var(flag_record_gcc_switches)
1518 Record gcc command line switches in the object file.
1521 Common Report Var(flag_pcc_struct_return,0) Optimization
1522 Return small aggregates in registers
1525 Common Report Var(flag_regmove) Optimization
1526 Enables a register move optimization
1529 Common Report Var(flag_rename_registers) Init(2) Optimization
1530 Perform a register renaming optimization pass
1533 Common Report Var(flag_reorder_blocks) Optimization
1534 Reorder basic blocks to improve code placement
1536 freorder-blocks-and-partition
1537 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1538 Reorder basic blocks and partition into hot and cold sections
1541 Common Report Var(flag_reorder_functions) Optimization
1542 Reorder functions to improve code placement
1544 frerun-cse-after-loop
1545 Common Report Var(flag_rerun_cse_after_loop) Optimization
1546 Add a common subexpression elimination pass after loop optimizations
1550 Does nothing. Preserved for backward compatibility.
1553 Common Report Var(flag_rounding_math) Optimization
1554 Disable optimizations that assume default FP rounding behavior
1557 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1558 Enable scheduling across basic blocks
1561 Common Report Var(flag_sched_pressure) Init(0) Optimization
1562 Enable register pressure sensitive insn scheduling
1565 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1566 Allow speculative motion of non-loads
1569 Common Report Var(flag_schedule_speculative_load) Optimization
1570 Allow speculative motion of some loads
1572 fsched-spec-load-dangerous
1573 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1574 Allow speculative motion of more loads
1577 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1578 -fsched-verbose=<number> Set the verbosity level of the scheduler
1580 fsched2-use-superblocks
1581 Common Report Var(flag_sched2_use_superblocks) Optimization
1582 If scheduling post reload, do superblock scheduling
1586 Does nothing. Preserved for backward compatibility.
1589 Common Report Var(flag_schedule_insns) Optimization
1590 Reschedule instructions before register allocation
1593 Common Report Var(flag_schedule_insns_after_reload) Optimization
1594 Reschedule instructions after register allocation
1596 ; This flag should be on when a target implements non-trivial
1597 ; scheduling hooks, maybe saving some information for its own sake.
1598 ; On IA64, for example, this is used for correct bundling.
1599 fselective-scheduling
1600 Common Report Var(flag_selective_scheduling) Optimization
1601 Schedule instructions using selective scheduling algorithm
1603 fselective-scheduling2
1604 Common Report Var(flag_selective_scheduling2) Optimization
1605 Run selective scheduling after reload
1607 fsel-sched-pipelining
1608 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1609 Perform software pipelining of inner loops during selective scheduling
1611 fsel-sched-pipelining-outer-loops
1612 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1613 Perform software pipelining of outer loops during selective scheduling
1615 fsel-sched-reschedule-pipelined
1616 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1617 Reschedule pipelined regions without pipelining
1619 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1620 ; of stalled insns into the ready list.
1621 fsched-stalled-insns
1622 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1623 Allow premature scheduling of queued insns
1625 fsched-stalled-insns=
1626 Common RejectNegative Joined UInteger
1627 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1629 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1630 ; be examined for a dependency on a stalled insn that is candidate for
1631 ; premature removal from the queue of stalled insns into the ready list (has
1632 ; an effect only if the flag 'sched_stalled_insns' is set).
1633 fsched-stalled-insns-dep
1634 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1635 Set dependence distance checking in premature scheduling of queued insns
1637 fsched-stalled-insns-dep=
1638 Common RejectNegative Joined UInteger
1639 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1641 fsched-group-heuristic
1642 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1643 Enable the group heuristic in the scheduler
1645 fsched-critical-path-heuristic
1646 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1647 Enable the critical path heuristic in the scheduler
1649 fsched-spec-insn-heuristic
1650 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1651 Enable the speculative instruction heuristic in the scheduler
1653 fsched-rank-heuristic
1654 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1655 Enable the rank heuristic in the scheduler
1657 fsched-last-insn-heuristic
1658 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1659 Enable the last instruction heuristic in the scheduler
1661 fsched-dep-count-heuristic
1662 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1663 Enable the dependent count heuristic in the scheduler
1666 Common Report Var(flag_section_anchors) Optimization
1667 Access data in the same section from shared anchor points
1671 Does nothing. Preserved for backward compatibility.
1674 Common Report Var(flag_zee) Init(0)
1675 Eliminate redundant zero extensions on targets that support implicit extensions.
1678 Common Report Var(flag_show_column) Init(1)
1679 Show column numbers in diagnostics, when available. Default on
1682 Common Report Var(flag_signaling_nans) Optimization
1683 Disable optimizations observable by IEEE signaling NaNs
1686 Common Report Var(flag_signed_zeros) Init(1) Optimization
1687 Disable floating point optimizations that ignore the IEEE signedness of zero
1689 fsingle-precision-constant
1690 Common Report Var(flag_single_precision_constant) Optimization
1691 Convert floating point constants to single precision constants
1693 fsplit-ivs-in-unroller
1694 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1695 Split lifetimes of induction variables when loops are unrolled
1698 Common Report Var(flag_split_stack) Init(-1)
1699 Generate discontiguous stack frames
1702 Common Report Var(flag_split_wide_types) Optimization
1703 Split wide types into independent registers
1705 fvariable-expansion-in-unroller
1706 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1707 Apply variable expansion when loops are unrolled
1710 Common Report RejectNegative Joined
1711 -fstack-check=[no|generic|specific] Insert stack checking code into the program
1714 Common Alias(fstack-check=, specific, no)
1715 Insert stack checking code into the program. Same as -fstack-check=specific
1718 Common Var(common_deferred_options) Defer
1720 fstack-limit-register=
1721 Common RejectNegative Joined Var(common_deferred_options) Defer
1722 -fstack-limit-register=<register> Trap if the stack goes past <register>
1724 fstack-limit-symbol=
1725 Common RejectNegative Joined Var(common_deferred_options) Defer
1726 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
1729 Common Report Var(flag_stack_protect, 1)
1730 Use propolice as a stack protection method
1732 fstack-protector-all
1733 Common Report RejectNegative Var(flag_stack_protect, 2)
1734 Use a stack protection method for every function
1737 Common RejectNegative Var(flag_stack_usage)
1738 Output stack usage information on a per-function basis
1742 Does nothing. Preserved for backward compatibility.
1744 ; Nonzero if we should do (language-dependent) alias analysis.
1745 ; Typically, this analysis will assume that expressions of certain
1746 ; types do not alias expressions of certain other types. Only used
1747 ; if alias analysis (in general) is enabled.
1749 Common Report Var(flag_strict_aliasing) Optimization
1750 Assume strict aliasing rules apply
1753 Common Report Var(flag_strict_overflow)
1754 Treat signed overflow as undefined
1757 Common Report Var(flag_syntax_only)
1758 Check for syntax errors, then stop
1761 Common Report Var(flag_test_coverage)
1762 Create data files needed by \"gcov\"
1765 Common Report Var(flag_thread_jumps) Optimization
1766 Perform jump threading optimizations
1769 Common Report Var(time_report)
1770 Report the time taken by each compiler pass
1773 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
1774 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
1777 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
1780 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
1783 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
1786 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
1789 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
1792 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
1793 Reorder top level functions, variables, and asms
1796 Common Report Var(flag_tracer)
1797 Perform superblock formation via tail duplication
1799 ; Zero means that floating-point math operations cannot generate a
1800 ; (user-visible) trap. This is the case, for example, in nonstop
1801 ; IEEE 754 arithmetic.
1803 Common Report Var(flag_trapping_math) Init(1) Optimization
1804 Assume floating-point operations can trap
1807 Common Report Var(flag_trapv) Optimization
1808 Trap for signed overflow in addition, subtraction and multiplication
1811 Common Report Var(flag_tree_ccp) Optimization
1812 Enable SSA-CCP optimization on trees
1815 Common Report Var(flag_tree_bit_ccp) Optimization
1816 Enable SSA-BIT-CCP optimization on trees
1820 Does nothing. Preserved for backward compatibility.
1823 Common Report Var(flag_tree_ch) Optimization
1824 Enable loop header copying on trees
1827 Common Report Var(flag_tree_copyrename) Optimization
1828 Replace SSA temporaries with better names in copies
1831 Common Report Var(flag_tree_copy_prop) Optimization
1832 Enable copy propagation on trees
1834 ftree-store-copy-prop
1836 Does nothing. Preserved for backward compatibility.
1839 Common Report Var(flag_tree_cselim) Init(2) Optimization
1840 Transform condition stores into unconditional ones
1842 ftree-switch-conversion
1843 Common Report Var(flag_tree_switch_conversion) Optimization
1844 Perform conversions of switch initializations.
1847 Common Report Var(flag_tree_dce) Optimization
1848 Enable SSA dead code elimination optimization on trees
1850 ftree-dominator-opts
1851 Common Report Var(flag_tree_dom) Optimization
1852 Enable dominator optimizations
1855 Common Report Var(flag_tree_dse) Optimization
1856 Enable dead store elimination
1859 Common Report Var(flag_tree_forwprop) Init(1) Optimization
1860 Enable forward propagation on trees
1863 Common Report Var(flag_tree_fre) Optimization
1864 Enable Full Redundancy Elimination (FRE) on trees
1866 ftree-loop-distribution
1867 Common Report Var(flag_tree_loop_distribution) Optimization
1868 Enable loop distribution on trees
1870 ftree-loop-distribute-patterns
1871 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
1872 Enable loop distribution for patterns transformed into a library call
1875 Common Report Var(flag_tree_loop_im) Init(1) Optimization
1876 Enable loop invariant motion on trees
1879 Common Report Var(flag_tree_loop_linear) Optimization
1880 Enable linear loop transforms on trees
1883 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
1884 Create canonical induction variables in loops
1887 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
1888 Enable loop optimizations on tree level
1890 ftree-parallelize-loops=
1891 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
1892 Enable automatic parallelization of loops
1895 Common Report Var(flag_tree_phiprop) Init(1) Optimization
1896 Enable hoisting loads from conditional pointers.
1899 Common Report Var(flag_tree_pre) Optimization
1900 Enable SSA-PRE optimization on trees
1903 Common Report Var(flag_tree_pta) Init(1) Optimization
1904 Perform function-local points-to analysis on trees.
1907 Common Report Var(flag_tree_reassoc) Init(1) Optimization
1908 Enable reassociation on tree level
1912 Does nothing. Preserved for backward compatibility.
1915 Common Report Var(flag_tree_sink) Optimization
1916 Enable SSA code sinking on trees
1919 Common Report Var(flag_tree_sra) Optimization
1920 Perform scalar replacement of aggregates
1923 Common Report Var(flag_tree_ter) Optimization
1924 Replace temporary expressions in the SSA->normal pass
1927 Common Report Var(flag_tree_live_range_split) Optimization
1928 Perform live range splitting during the SSA->normal pass
1931 Common Report Var(flag_tree_vrp) Init(0) Optimization
1932 Perform Value Range Propagation on trees
1935 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
1936 Compile whole compilation unit at a time
1939 Common Report Var(flag_unroll_loops) Optimization
1940 Perform loop unrolling when iteration count is known
1943 Common Report Var(flag_unroll_all_loops) Optimization
1944 Perform loop unrolling for all loops
1946 ; Nonzero means that loop optimizer may assume that the induction variables
1947 ; that control loops do not overflow and that the loops with nontrivial
1948 ; exit condition are not infinite
1949 funsafe-loop-optimizations
1950 Common Report Var(flag_unsafe_loop_optimizations) Optimization
1951 Allow loop optimizations to assume that the loops behave in normal way
1954 Common Report Var(flag_associative_math)
1955 Allow optimization for floating-point arithmetic which may change the
1956 result of the operation due to rounding.
1959 Common Report Var(flag_reciprocal_math)
1960 Same as -fassociative-math for expressions which include division.
1962 ; Nonzero means that unsafe floating-point math optimizations are allowed
1963 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
1964 ; are allowed to assume that their arguments and results are "normal"
1965 ; (e.g., nonnegative for SQRT).
1966 funsafe-math-optimizations
1967 Common Report Var(flag_unsafe_math_optimizations) Optimization
1968 Allow math optimizations that may violate IEEE or ISO standards
1971 Common Report Var(flag_unswitch_loops) Optimization
1972 Perform loop unswitching
1975 Common Report Var(flag_unwind_tables) Optimization
1976 Just generate unwind tables for exception handling
1981 ; Positive if we should track variables, negative if we should run
1982 ; the var-tracking pass only to discard debug annotations, zero if
1983 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
1984 ; will be set according to optimize, debug_info_level and debug_hooks
1985 ; in process_options ().
1987 Common Report Var(flag_var_tracking) Init(2) Optimization
1988 Perform variable tracking
1990 ; Positive if we should track variables at assignments, negative if
1991 ; we should run the var-tracking pass only to discard debug
1992 ; annotations. When flag_var_tracking_assignments ==
1993 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
1994 fvar-tracking-assignments
1995 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
1996 Perform variable tracking by annotating assignments
1998 ; Nonzero if we should toggle flag_var_tracking_assignments after
1999 ; processing options and computing its default. */
2000 fvar-tracking-assignments-toggle
2001 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2002 Toggle -fvar-tracking-assignments
2004 fvar-tracking-uninit
2005 Common Report Var(flag_var_tracking_uninit) Optimization
2006 Perform variable tracking and also tag variables that are uninitialized
2009 Common Report Var(flag_tree_vectorize) Optimization
2010 Enable loop vectorization on trees
2013 Common Report Var(flag_tree_slp_vectorize) Init(2) Optimization
2014 Enable basic block vectorization (SLP) on trees
2017 Common Report Var(flag_vect_cost_model) Optimization
2018 Enable use of cost model in vectorization
2020 ftree-vect-loop-version
2021 Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization
2022 Enable loop versioning when doing loop vectorization on trees
2024 ftree-vectorizer-verbose=
2025 Common RejectNegative Joined UInteger
2026 -ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
2029 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2030 Enable copy propagation of scalar-evolution information.
2032 ; -fverbose-asm causes extra commentary information to be produced in
2033 ; the generated assembly code (to make it more readable). This option
2034 ; is generally only of use to those who actually need to read the
2035 ; generated assembly code (perhaps while debugging the compiler itself).
2036 ; -fno-verbose-asm, the default, causes the extra information
2037 ; to not be added and is useful when comparing two assembler files.
2039 Common Report Var(flag_verbose_asm)
2040 Add extra commentary to assembler output
2043 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2044 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2047 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2050 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2053 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2056 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2059 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2062 Common Report Var(flag_value_profile_transformations) Optimization
2063 Use expression value profiles in optimizations
2066 Common Report Var(flag_web) Init(2) Optimization
2067 Construct webs and split unrelated uses of single variable
2069 ftree-builtin-call-dce
2070 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2071 Enable conditional dead code elimination for builtin calls
2074 Common Report Var(flag_whole_program) Init(0) Optimization
2075 Perform whole program optimizations
2078 Common Report Var(flag_wrapv) Optimization
2079 Assume signed arithmetic overflow wraps around
2081 fzero-initialized-in-bss
2082 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2083 Put zero initialized data in the bss section
2086 Common JoinedOrMissing
2087 Generate debug information in default format
2090 Common JoinedOrMissing Negative(gdwarf-)
2091 Generate debug information in COFF format
2094 Common Joined UInteger Var(dwarf_version) Init(2) Negative(gstabs)
2095 Generate debug information in DWARF v2 (or later) format
2098 Common JoinedOrMissing
2099 Generate debug information in default extended format
2102 Common JoinedOrMissing Negative(gstabs+)
2103 Generate debug information in STABS format
2106 Common JoinedOrMissing Negative(gvms)
2107 Generate debug information in extended STABS format
2110 Common RejectNegative Var(dwarf_strict,0) Init(-1)
2111 Emit DWARF additions beyond selected version
2114 Common Report RejectNegative Var(dwarf_strict,1)
2115 Don't emit DWARF additions beyond selected version
2118 Common Report Var(flag_gtoggle)
2119 Toggle debug information generation
2122 Common JoinedOrMissing Negative(gxcoff)
2123 Generate debug information in VMS format
2126 Common JoinedOrMissing Negative(gxcoff+)
2127 Generate debug information in XCOFF format
2130 Common JoinedOrMissing Negative(gcoff)
2131 Generate debug information in extended XCOFF format
2134 Driver Joined Separate
2137 Common Joined Var(plugindir_string) Init(0)
2138 -iplugindir=<dir> Set <dir> to be the default plugin directory
2141 Driver Joined Separate
2143 no-canonical-prefixes
2153 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2154 -o <file> Place output into <file>
2157 Common Var(profile_flag)
2158 Enable function profiling
2161 Driver Var(pass_exit_codes)
2164 Common Var(pedantic)
2165 Issue warnings needed for strict compliance to the standard
2168 Common Var(flag_pedantic_errors)
2169 Like -pedantic but issue them as errors
2175 Driver Var(use_pipes)
2178 Driver JoinedOrMissing Var(print_file_name)
2180 print-libgcc-file-name
2183 print-multi-directory
2184 Driver Var(print_multi_directory)
2187 Driver Var(print_multi_lib)
2189 print-multi-os-directory
2190 Driver Var(print_multi_os_directory)
2193 Driver JoinedOrMissing Var(print_prog_name)
2196 Driver Var(print_search_dirs)
2199 Driver Var(print_sysroot)
2201 print-sysroot-headers-suffix
2202 Driver Var(print_sysroot_headers_suffix)
2205 Common Var(quiet_flag) RejectDriver
2206 Do not display functions compiled or elapsed time
2215 Driver Var(report_times)
2218 Driver JoinedOrMissing
2221 Driver Joined Separate
2225 ; C option, but driver must not handle as "-u ndef".
2228 Common Driver Var(verbose_flag)
2229 Enable verbose output
2232 Common Var(version_flag) RejectDriver
2233 Display the compiler's version
2236 Common Var(inhibit_warnings)
2240 Driver Separate Var(wrapper_string)
2243 Driver Joined Separate
2246 Common RejectNegative Negative(pie)
2247 Create a shared library
2253 Driver Separate Alias(specs=)
2266 ; Documented for Fortran, but always accepted by driver.
2275 Common RejectNegative Negative(shared)
2276 Create a position independent executable
2279 Driver Joined Separate
2281 ; This comment is to ensure we retain the blank line above.