1 ; Options for the language- and target-independent parts of the compiler.
3 ; Copyright (C) 2003-2014 Free Software Foundation, Inc.
5 ; This file is part of GCC.
7 ; GCC is free software; you can redistribute it and/or modify it under
8 ; the terms of the GNU General Public License as published by the Free
9 ; Software Foundation; either version 3, or (at your option) any later
12 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 ; You should have received a copy of the GNU General Public License
18 ; along with GCC; see the file COPYING3. If not see
19 ; <http://www.gnu.org/licenses/>.
21 ; See the GCC internals manual (options.texi) for a description of this file's format.
23 ; Please try to keep this file in ASCII collating order.
37 ; Not used directly to control optimizations, only to save -Ofast
38 ; setting for "optimize" attributes.
42 ; True if this is the lto front end. This is used to disable gimple
43 ; generation and lowering passes that are normally run on the output
44 ; of a front end. These passes must be bypassed for lto since they
45 ; have already been done before the gimple was written.
49 ; 0 means straightforward implementation of complex divide acceptable.
50 ; 1 means wide ranges of inputs must work for complex divide.
51 ; 2 means C99-like requirements for complex multiply and divide.
53 int flag_complex_method = 1
55 ; Nonzero if subexpressions must be evaluated from left-to-right.
57 int flag_evaluation_order = 0
59 ; Language specific warning pass for unused results.
61 bool flag_warn_unused_result = false
66 ; Nonzero if we should write GIMPLE bytecode for link-time optimization.
70 ; True to warn about any objects definitions whose size is larger
71 ; than N bytes. Also want about function definitions whose returned
72 ; values are larger than N bytes, where N is 'larger_than_size'.
77 HOST_WIDE_INT larger_than_size
79 ; True to warn about any function whose frame size is larger
82 bool warn_frame_larger_than
85 HOST_WIDE_INT frame_larger_than_size
87 ; Nonzero means we should be saving declaration info into a .X file.
89 int flag_gen_aux_info = 0
91 ; Nonzero if we are compiling code for a shared library, zero for
96 ; These two are really VEC(char_p,heap) *.
99 void *flag_instrument_functions_exclude_functions
102 void *flag_instrument_functions_exclude_files
104 ; Generic structs (e.g. templates not explicitly specialized)
105 ; may not have a compilation unit associated with them, and so
106 ; may need to be treated differently from ordinary structs.
108 ; Structs only handled by reference (indirectly), will also usually
109 ; not need as much debugging information.
112 enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
115 enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
117 ; True if we should exit after parsing options.
119 bool exit_after_options
121 ; Type(s) of debugging information we are producing (if any). See
122 ; flag-types.h for the definitions of the different possible types of
123 ; debugging information.
125 enum debug_info_type write_symbols = NO_DEBUG
127 ; Level of debugging information we are producing. See flag-types.h
128 ; for the definitions of the different possible levels.
130 enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
132 ; Nonzero means use GNU-only extensions in the generated symbolic
133 ; debugging information. Currently, this only has an effect when
134 ; write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG.
136 bool use_gnu_debug_info_extensions
138 ; Original value of maximum field alignment in bytes, specified via
139 ; -fpack-struct=<value>.
141 unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
143 ; Type of stack check.
145 enum stack_check_type flag_stack_check = NO_STACK_CHECK
147 ; True if stack usage information needs to be computed.
149 bool flag_stack_usage_info = false
151 ; -dA causes debug commentary information to be produced in
152 ; the generated assembly code (to make it more readable). This option
153 ; is generally only of use to those who actually need to read the
154 ; generated assembly code (perhaps while debugging the compiler itself).
155 ; Currently, this switch is only used by dwarf2out.c; however, it is intended
156 ; to be a catchall for printing debug information in the assembler file.
160 ; -dP causes the rtl to be emitted as a comment in assembly.
162 int flag_dump_rtl_in_asm
164 ; Whether -da was passed (used only in handle_common_deferred_options).
166 bool flag_dump_all_passed
168 ; Other flags saying which kinds of debugging dump have been requested.
171 int rtl_dump_and_exit
174 int flag_print_asm_name
176 ; Name of top-level original source file (what was input to cpp).
177 ; This comes from the #-command at the beginning of the actual input.
178 ; If there isn't any there, then this is the cc1 input file name.
180 const char *main_input_filename
182 ; Pointer to base name in main_input_filename, with directories and a
183 ; single final extension removed, and the length of this base
187 const char *main_input_basename
190 int main_input_baselength
192 ; Which options have been printed by --help.
196 ; Which enums have been printed by --help. 0 = not printed, no
197 ; relevant options seen, 1 = relevant option seen, not yet printed, 2
200 char *help_enum_printed
202 ; The number of columns for --help output.
204 unsigned int help_columns
206 ; Whether this options structure has been through finish_options
208 bool flag_opts_finished
210 ; What the sanitizer should instrument
212 unsigned int flag_sanitize
214 ; Flag whether a prefix has been added to dump_base_name
216 bool dump_base_name_prefixed = false
228 Driver Alias(coverage)
234 Common Separate Alias(d)
237 Common Joined Alias(d)
240 Common Separate Alias(dumpbase)
243 Common Separate Alias(dumpdir)
246 Driver Separate Alias(e)
249 Driver Joined Alias(e)
252 Common Warning Alias(Wextra)
255 Driver Separate Alias(Xassembler)
258 Driver JoinedOrMissing Alias(Xassembler)
261 Driver Separate Alias(Xlinker)
264 Driver JoinedOrMissing Alias(Xlinker)
267 Driver Separate Alias(u)
270 Driver Joined Alias(u)
273 Common Driver Var(help_flag)
274 Display this information
277 Common Driver Report Joined
278 --help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params
281 Driver Separate Alias(x)
284 Driver Joined Alias(x)
287 Driver Separate Alias(L)
290 Driver Joined Alias(L)
292 -no-canonical-prefixes
293 Driver Alias(no-canonical-prefixes)
295 -no-standard-libraries
296 Driver Alias(nostdlib)
299 Driver Var(no_sysroot_suffix)
308 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
311 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
314 Driver Alias(pass-exit-codes)
317 Common Alias(Wpedantic)
320 Common Alias(pedantic-errors)
329 Driver Separate Alias(B)
332 Driver JoinedOrMissing Alias(B)
338 Driver Separate Alias(print-file-name=)
341 Driver JoinedOrMissing Alias(print-file-name=)
343 -print-libgcc-file-name
344 Driver Alias(print-libgcc-file-name)
346 -print-multi-directory
347 Driver Alias(print-multi-directory)
350 Driver Alias(print-multi-lib)
352 -print-multi-os-directory
353 Driver Alias(print-multi-os-directory)
356 Driver Alias(print-multiarch)
359 Driver Separate Alias(print-prog-name=)
362 Driver JoinedOrMissing Alias(print-prog-name=)
365 Driver Alias(print-search-dirs)
368 Driver Alias(print-sysroot)
370 -print-sysroot-headers-suffix
371 Driver Alias(print-sysroot-headers-suffix)
377 Driver Alias(save-temps)
383 Driver Separate Alias(specs=)
386 Driver Joined Alias(specs=)
392 Driver Alias(symbolic)
396 Alias for --help=target
404 ;; The driver used to convert options such as --help into forms such
405 ;; as -fhelp; the following four entries are for compatibility with
406 ;; any direct uses of those (undocumented) -f forms
408 Common Driver Alias(-help)
411 Common Driver Joined Alias(-help=)
414 Common Driver Alias(-target-help)
417 Common Driver Alias(-version)
421 --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
424 Common Joined Alias(-param)
427 Driver Separate Alias(-sysroot=)
430 Driver JoinedOrMissing
436 Driver Joined Separate
442 Driver Joined Separate
448 Common JoinedOrMissing Optimization
449 -O<number> Set optimization level to <number>
453 Optimize for space rather than speed
457 Optimize for speed disregarding exact standards compliance
461 Optimize for debugging experience rather than speed or size
473 Driver Joined Separate
479 Driver Joined Separate
500 Common RejectNegative Warning Alias(Wextra)
501 This switch is deprecated; use -Wextra instead
504 Driver JoinedOrMissing
507 Driver JoinedOrMissing
510 Driver JoinedOrMissing
513 Common Var(warn_aggregate_return) Warning
514 Warn about returning structures, unions or arrays
516 Waggressive-loop-optimizations
517 Common Var(warn_aggressive_loop_optimizations) Init(1) Warning
518 Warn if a loop with constant number of iterations triggers undefined behavior
521 Common Var(warn_array_bounds) Warning
522 Warn if an array is accessed out of bounds
525 Common Var(warn_attributes) Init(1) Warning
526 Warn about inappropriate attribute usage
529 Common Var(warn_cast_align) Warning
530 Warn about pointer casts which increase alignment
533 Common Var(warn_cpp) Init(1) Warning
534 Warn when a #warning directive is encountered
536 Wdeprecated-declarations
537 Common Var(warn_deprecated_decl) Init(1) Warning
538 Warn about uses of __attribute__((deprecated)) declarations
540 Wdisabled-optimization
541 Common Var(warn_disabled_optimization) Warning
542 Warn when an optimization pass is disabled
545 Common Var(warnings_are_errors)
546 Treat all warnings as errors
550 Treat specified warning as error
553 Common Var(extra_warnings) Warning
554 Print extra (possibly unwanted) warnings
557 Common Var(flag_fatal_errors)
558 Exit on the first error occurred
561 Common RejectNegative Joined UInteger
562 -Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
565 Common Var(warn_free_nonheap_object) Init(1) Warning
566 Warn when attempting to free a non-heap object
569 Common Var(warn_inline) Warning
570 Warn when an inlined function cannot be inlined
572 Winvalid-memory-model
573 Common Var(warn_invalid_memory_model) Init(1) Warning
574 Warn when an atomic memory model parameter is known to be outside the valid range.
577 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
580 Common RejectNegative Joined UInteger Warning
581 -Wlarger-than=<number> Warn if an object is larger than <number> bytes
583 Wunsafe-loop-optimizations
584 Common Var(warn_unsafe_loop_optimizations) Warning
585 Warn if the loop cannot be optimized due to nontrivial assumptions.
588 Common Alias(Wsuggest-attribute=noreturn)
591 Common Var(warn_odr_violations) Init(1) Warning
592 Warn about some C++ One Definition Rule violations during link time optimization
595 Common Var(warn_overflow) Init(1) Warning
596 Warn about overflow in arithmetic expressions
599 Common Var(warn_packed) Warning
600 Warn when the packed attribute has no effect on struct layout
603 Common Var(warn_padded) Warning
604 Warn when padding is required to align structure members
607 Common Var(pedantic) Init(0) Warning
608 Issue warnings needed for strict compliance to the standard
611 Common Var(warn_return_local_addr) Init(1) Warning
612 Warn about returning a pointer/reference to a local or temporary variable.
615 Common Var(warn_shadow) Warning
616 Warn when one local variable shadows another
619 Common Var(warn_stack_protect) Warning
620 Warn when not issuing stack smashing protection for some reason
623 Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
624 Warn if stack usage might be larger than specified amount
628 Warn about code which might break strict aliasing rules
631 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
632 Warn about code which might break strict aliasing rules
636 Warn about optimizations that assume that signed overflow is undefined
639 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
640 Warn about optimizations that assume that signed overflow is undefined
642 Wsuggest-attribute=const
643 Common Var(warn_suggest_attribute_const) Warning
644 Warn about functions which might be candidates for __attribute__((const))
646 Wsuggest-attribute=pure
647 Common Var(warn_suggest_attribute_pure) Warning
648 Warn about functions which might be candidates for __attribute__((pure))
650 Wsuggest-attribute=noreturn
651 Common Var(warn_suggest_attribute_noreturn) Warning
652 Warn about functions which might be candidates for __attribute__((noreturn))
655 Common Var(warn_suggest_final_types) Warning
656 Warn about C++ polymorphic types where adding final keyword would improve code quality
658 Wsuggest-final-methods
659 Common Var(warn_suggest_final_methods) Warning
660 Warn about C++ virtual methods where adding final keyword would improve code quality
663 Common Var(warn_system_headers) Warning
664 Do not suppress warnings from system headers
667 Common Var(warn_trampolines) Warning
668 Warn whenever a trampoline is generated
671 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
672 Warn if a comparison is always true or always false due to the limited range of the data type
675 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
676 Warn about uninitialized automatic variables
679 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
680 Warn about maybe uninitialized automatic variables
684 Does nothing. Preserved for backward compatibility.
687 Common Var(warn_unused) Init(0) Warning
688 Enable all -Wunused- warnings
690 Wunused-but-set-parameter
691 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
692 Warn when a function parameter is only set, otherwise unused
694 Wunused-but-set-variable
695 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
696 Warn when a variable is only set, otherwise unused
699 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
700 Warn when a function is unused
703 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
704 Warn when a label is unused
707 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
708 Warn when a function parameter is unused
711 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
712 Warn when an expression value is unused
715 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
716 Warn when a variable is unused
719 Common Var(warn_coverage_mismatch) Init(1) Warning
720 Warn in case profiles in -fprofile-use do not match
722 Wvector-operation-performance
723 Common Var(warn_vector_operation_performance) Warning
724 Warn when a vector operation is compiled outside the SIMD
739 Common Separate Var(aux_info_file_name)
740 -aux-info <file> Emit declaration information into <file>
743 Common Joined Alias(aux-info)
746 Common Separate RejectDriver Var(aux_base_name)
749 Common Separate RejectDriver
759 -d<letters> Enable dumps from specific passes of the compiler
762 Common Separate Var(dump_base_name)
763 -dumpbase <file> Set the file basename to be used for dumps
766 Common Separate Var(dump_dir_name)
767 -dumpdir <dir> Set the directory name to be used for dumps
779 Driver Joined Separate
781 ; This option has historically been passed down to the linker by an
782 ; accident of a %{e*} spec, so ensure it continues to be passed down
783 ; as a single option. The supported option for this purpose is
784 ; -rdynamic. See PR 47390.
788 ; The version of the C++ ABI in use. The following values are allowed:
790 ; 0: The version of the ABI believed most conformant with the C++ ABI
791 ; specification. This ABI may change as bugs are discovered and fixed.
792 ; Therefore, 0 will not necessarily indicate the same ABI in different
795 ; 1: The version of the ABI first used in G++ 3.2. No longer selectable.
797 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
799 ; 3: The version of the ABI that fixes the missing underscore
800 ; in template non-type arguments of pointer type.
802 ; 4: The version of the ABI that introduces unambiguous mangling of
803 ; vector types. First selectable in G++ 4.5.
805 ; 5: The version of the ABI that ignores attribute const/noreturn
806 ; in function pointer mangling, and corrects mangling of decltype and
807 ; function parameters used in other parameters and the return type.
808 ; First selectable in G++ 4.6.
810 ; 6: The version of the ABI that doesn't promote scoped enums to int and
811 ; changes the mangling of template argument packs, const/static_cast,
812 ; prefix ++ and --, and a class scope function used as a template
814 ; First selectable in G++ 4.7.
816 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
817 ; corrects the mangling of lambdas in default argument scope.
818 ; First selectable in G++ 4.8.
820 ; 8: The version of the ABI that corrects the substitution behavior of
821 ; function types with function-cv-qualifiers.
822 ; First selectable in G++ 4.9.
824 ; Additional positive integers will be assigned as new versions of
825 ; the ABI become the default version of the ABI.
827 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(0)
828 The version of the C++ ABI in use
830 faggressive-loop-optimizations
831 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
832 Aggressively optimize loops using language constraints
835 Common Report Var(align_functions,0) Optimization UInteger
836 Align the start of functions
839 Common RejectNegative Joined UInteger Var(align_functions)
842 Common Report Var(align_jumps,0) Optimization UInteger
843 Align labels which are only reached by jumping
846 Common RejectNegative Joined UInteger Var(align_jumps)
849 Common Report Var(align_labels,0) Optimization UInteger
853 Common RejectNegative Joined UInteger Var(align_labels)
856 Common Report Var(align_loops,0) Optimization UInteger
857 Align the start of loops
860 Common RejectNegative Joined UInteger Var(align_loops)
864 Does nothing. Preserved for backward compatibility.
868 Does nothing. Preserved for backward compatibility.
870 fargument-noalias-global
872 Does nothing. Preserved for backward compatibility.
874 fargument-noalias-anything
876 Does nothing. Preserved for backward compatibility.
879 Common Driver Report Joined
880 Select what to sanitize
883 Common Report Var(flag_sanitize_recover) Init(1)
884 After diagnosing undefined behavior attempt to continue execution
886 fsanitize-undefined-trap-on-error
887 Common Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
888 Use trap instead of a library function for undefined behavior sanitization
890 fasynchronous-unwind-tables
891 Common Report Var(flag_asynchronous_unwind_tables) Optimization
892 Generate unwind tables that are exact at each instruction boundary
895 Common Report Var(flag_auto_inc_dec) Init(1)
896 Generate auto-inc/dec instructions
898 ; -fcheck-bounds causes gcc to generate array bounds checks.
899 ; For C, C++ and ObjC: defaults off.
900 ; For Java: defaults to on.
901 ; For Fortran: defaults to off.
903 Common Report Var(flag_bounds_check)
904 Generate code to check bounds before indexing arrays
907 Common Report Var(flag_branch_on_count_reg) Optimization
908 Replace add, compare, branch with branch on count register
910 fbranch-probabilities
911 Common Report Var(flag_branch_probabilities) Optimization
912 Use profiling information for branch probabilities
914 fbranch-target-load-optimize
915 Common Report Var(flag_branch_target_load_optimize) Optimization
916 Perform branch target load optimization before prologue / epilogue threading
918 fbranch-target-load-optimize2
919 Common Report Var(flag_branch_target_load_optimize2) Optimization
920 Perform branch target load optimization after prologue / epilogue threading
923 Common Report Var(flag_btr_bb_exclusive) Optimization
924 Restrict target load migration not to re-use registers in any basic block
927 Common Joined RejectNegative Var(common_deferred_options) Defer
928 -fcall-saved-<register> Mark <register> as being preserved across functions
931 Common Joined RejectNegative Var(common_deferred_options) Defer
932 -fcall-used-<register> Mark <register> as being corrupted by function calls
934 ; Nonzero for -fcaller-saves: allocate values in regs that need to
935 ; be saved across function calls, if that produces overall better code.
936 ; Optional now, so people can test it.
938 Common Report Var(flag_caller_saves) Optimization
939 Save registers around function calls
942 Common Report Var(flag_check_data_deps)
943 Compare the results of several data dependence analyzers.
946 Common Var(flag_check_new)
947 Check the return value of new in C++
949 fcombine-stack-adjustments
950 Common Report Var(flag_combine_stack_adjustments) Optimization
951 Looks for opportunities to reduce stack adjustments and stack references.
954 Common Report Var(flag_no_common,0) Optimization
955 Do not put uninitialized globals in the common section
959 ; Converted by the driver to -fcompare-debug= options.
962 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
963 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
965 fcompare-debug-second
966 Common Driver RejectNegative Var(flag_compare_debug)
967 Run only the second compilation of -fcompare-debug
970 Common Report Var(flag_compare_elim_after_reload) Optimization
971 Perform comparison elimination after register allocation has finished
974 Common Var(flag_conserve_stack) Optimization
975 Do not perform optimizations increasing noticeably stack usage
978 Common Report Var(flag_cprop_registers) Optimization
979 Perform a register copy-propagation optimization pass
982 Common Report Var(flag_crossjumping) Optimization
983 Perform cross-jumping optimization
986 Common Report Var(flag_cse_follow_jumps) Optimization
987 When running CSE, follow jumps to their targets
991 Does nothing. Preserved for backward compatibility.
994 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
995 Omit range reduction step when performing complex division
998 Common Report Var(flag_cx_fortran_rules) Optimization
999 Complex multiplication and division follow Fortran rules
1002 Common Report Var(flag_data_sections) Optimization
1003 Place data items into their own section
1006 Common Report Var(common_deferred_options) Defer
1007 List all available debugging counters with their limits and counts.
1010 Common RejectNegative Joined Var(common_deferred_options) Defer
1011 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
1014 Common Joined RejectNegative Var(common_deferred_options) Defer
1015 Map one directory name to another in debug information
1017 fdebug-types-section
1018 Common Report Var(flag_debug_types_section) Init(0)
1019 Output .debug_types section when using DWARF v4 debuginfo.
1021 ; Nonzero for -fdefer-pop: don't pop args after each function call
1022 ; instead save them up to pop many calls' args with one insns.
1024 Common Report Var(flag_defer_pop) Optimization
1025 Defer popping functions args from stack until later
1028 Common Report Var(flag_delayed_branch) Optimization
1029 Attempt to fill delay slots of branch instructions
1031 fdelete-dead-exceptions
1032 Common Report Var(flag_delete_dead_exceptions) Init(0)
1033 Delete dead instructions that may throw exceptions
1035 fdelete-null-pointer-checks
1036 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
1037 Delete useless null pointer checks
1039 fdevirtualize-speculatively
1040 Common Report Var(flag_devirtualize_speculatively) Optimization
1041 Perform speculative devirtualization
1044 Common Report Var(flag_devirtualize) Optimization
1045 Try to convert virtual calls to direct ones.
1047 fdiagnostics-show-location=
1048 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1049 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
1051 ; Required for these enum values.
1056 Name(diagnostic_prefixing_rule) Type(int)
1059 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1062 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1064 fdiagnostics-show-caret
1065 Common Var(flag_diagnostics_show_caret) Init(1)
1066 Show the source line with a caret indicating the column
1069 Common Alias(fdiagnostics-color=,always,never)
1073 Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1074 -fdiagnostics-color=[never|always|auto] Colorize diagnostics
1076 ; Required for these enum values.
1081 Name(diagnostic_color_rule) Type(int)
1084 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1087 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1090 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1092 fdiagnostics-show-option
1093 Common Var(flag_diagnostics_show_option) Init(1)
1094 Amend appropriate diagnostic messages with the command line option that controls them
1097 Common Joined RejectNegative Var(common_deferred_options) Defer
1098 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1101 Common Joined RejectNegative Var(common_deferred_options) Defer
1102 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1105 Common Joined RejectNegative Var(common_deferred_options) Defer
1106 -fdump-<type> Dump various compiler internals to a file
1109 Driver RejectNegative
1112 Common RejectNegative Joined Var(flag_dump_final_insns)
1113 -fdump-final-insns=filename Dump to filename the insns at the end of translation
1116 Common RejectNegative Joined Var(flag_dump_go_spec)
1117 -fdump-go-spec=filename Write all declarations to file as Go code
1120 Common Report Var(flag_dump_noaddr)
1121 Suppress output of addresses in debugging dumps
1124 Common Var(flag_dump_passes) Init(0)
1125 Dump optimization passes
1128 Common Report Var(flag_dump_unnumbered)
1129 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1131 fdump-unnumbered-links
1132 Common Report Var(flag_dump_unnumbered_links)
1133 Suppress output of previous and next insn numbers in debugging dumps
1136 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1137 Enable CFI tables via GAS assembler directives.
1140 Common Report Var(flag_early_inlining) Init(1) Optimization
1141 Perform early inlining
1143 feliminate-dwarf2-dups
1144 Common Report Var(flag_eliminate_dwarf2_dups)
1145 Perform DWARF2 duplicate elimination
1148 Common Report Var(flag_ipa_sra) Init(0) Optimization
1149 Perform interprocedural reduction of aggregates
1151 feliminate-unused-debug-symbols
1152 Common Report Var(flag_debug_only_used_symbols)
1153 Perform unused type elimination in debug info
1155 feliminate-unused-debug-types
1156 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1157 Perform unused type elimination in debug info
1159 femit-class-debug-always
1160 Common Report Var(flag_emit_class_debug_always) Init(0)
1161 Do not suppress C++ class debug information.
1164 Common Report Var(flag_exceptions) Optimization
1165 Enable exception handling
1167 fexpensive-optimizations
1168 Common Report Var(flag_expensive_optimizations) Optimization
1169 Perform a number of minor, expensive optimizations
1172 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1173 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1176 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1179 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1182 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1188 Common Var(flag_fat_lto_objects)
1189 Output lto objects containing both the intermediate language and binary output.
1192 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1193 Assume no NaNs or infinities are generated
1196 Common Joined RejectNegative Var(common_deferred_options) Defer
1197 -ffixed-<register> Mark <register> as being unavailable to the compiler
1200 Common Report Var(flag_float_store) Optimization
1201 Don't allocate floats and doubles in extended-precision registers
1205 Does nothing. Preserved for backward compatibility.
1208 Common Report Var(flag_forward_propagate) Optimization
1209 Perform a forward propagation pass on RTL
1212 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1213 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1216 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1219 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1221 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1223 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1226 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1228 ; Nonzero means don't put addresses of constant functions in registers.
1229 ; Used for compiling the Unix kernel, where strange substitutions are
1230 ; done on the assembly output.
1232 Common Report Var(flag_no_function_cse,0)
1233 Allow function addresses to be held in registers
1236 Common Report Var(flag_function_sections)
1237 Place each function into its own section
1240 Common Report Var(flag_gcse) Optimization
1241 Perform global common subexpression elimination
1244 Common Report Var(flag_gcse_lm) Init(1) Optimization
1245 Perform enhanced load motion during global common subexpression elimination
1248 Common Report Var(flag_gcse_sm) Init(0) Optimization
1249 Perform store motion after global common subexpression elimination
1252 Common Report Var(flag_gcse_las) Init(0) Optimization
1253 Perform redundant load after store elimination in global common subexpression
1257 Common Report Var(flag_gcse_after_reload) Optimization
1258 Perform global common subexpression elimination after register allocation
1261 ; This option is not documented yet as its semantics will change.
1263 Common Report Var(flag_graphite)
1264 Enable in and out of Graphite representation
1267 Common Report Var(flag_graphite_identity) Optimization
1268 Enable Graphite Identity transformation
1270 fgraphite-code-generator=
1271 Common Report RejectNegative Joined Optimization Enum(fgraphite_generator) Var(flag_graphite_code_gen) Init(FGRAPHITE_CODE_GEN_ISL)
1272 Choose code generator of Graphite
1275 Name(fgraphite_generator) Type(enum fgraphite_generator) UnknownError(unknown code generator of graphite %qs)
1278 Enum(fgraphite_generator) String(isl) Value(FGRAPHITE_CODE_GEN_ISL)
1281 Enum(fgraphite_generator) String(cloog) Value(FGRAPHITE_CODE_GEN_CLOOG)
1283 fhoist-adjacent-loads
1284 Common Report Var(flag_hoist_adjacent_loads) Optimization
1285 Enable hoisting adjacent loads to encourage generating conditional move
1288 floop-parallelize-all
1289 Common Report Var(flag_loop_parallelize_all) Optimization
1290 Mark all loops as parallel
1293 Common Report Var(flag_loop_strip_mine) Optimization
1294 Enable Loop Strip Mining transformation
1297 Common Report Var(flag_loop_interchange) Optimization
1298 Enable Loop Interchange transformation
1301 Common Report Var(flag_loop_block) Optimization
1302 Enable Loop Blocking transformation
1305 Common Report Var(flag_tm)
1306 Enable support for GNU transactional memory
1309 Common Report Var(flag_gnu_unique) Init(1)
1310 Use STB_GNU_UNIQUE if supported by the assembler
1314 Does nothing. Preserved for backward compatibility.
1317 Common Report Var(flag_loop_optimize_isl) Optimization
1318 Enable the ISL based loop nest optimizer
1320 fstrict-volatile-bitfields
1321 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1322 Force bitfield accesses to match their type width
1324 fguess-branch-probability
1325 Common Report Var(flag_guess_branch_prob) Optimization
1326 Enable guessing of branch probabilities
1328 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1329 ; Generate position-independent code for executables if possible
1330 ; On SVR4 targets, it also controls whether or not to emit a
1331 ; string identifying the compiler.
1333 Common Report Var(flag_no_ident,0)
1334 Process #ident directives
1337 Common Report Var(flag_if_conversion) Optimization
1338 Perform conversion of conditional jumps to branchless equivalents
1341 Common Report Var(flag_if_conversion2) Optimization
1342 Perform conversion of conditional jumps to conditional execution
1345 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1346 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1349 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1352 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1355 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1358 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1360 ftree-loop-if-convert
1361 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1362 Convert conditional jumps in innermost loops to branchless equivalents
1364 ftree-loop-if-convert-stores
1365 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1366 Also if-convert conditional jumps containing memory writes
1368 ; -finhibit-size-directive inhibits output of .size for ELF.
1369 ; This is used only for compiling crtstuff.c,
1370 ; and it may be extended to other effects
1371 ; needed for crtstuff.c on other systems.
1372 finhibit-size-directive
1373 Common Report Var(flag_inhibit_size_directive)
1374 Do not generate .size directives
1377 Common Report Var(flag_indirect_inlining)
1378 Perform indirect inlining
1380 ; General flag to enable inlining. Specifying -fno-inline will disable
1381 ; all inlining apart from always-inline functions.
1383 Common Report Var(flag_no_inline,0) Init(0) Optimization
1384 Enable inlining of function declared \"inline\", disabling disables all inlining
1386 finline-small-functions
1387 Common Report Var(flag_inline_small_functions) Optimization
1388 Integrate functions into their callers when code size is known not to grow
1391 Common Report Var(flag_inline_functions) Optimization
1392 Integrate functions not declared \"inline\" into their callers when profitable
1394 finline-functions-called-once
1395 Common Report Var(flag_inline_functions_called_once) Optimization
1396 Integrate functions only required by their single caller
1399 Common RejectNegative Joined Alias(finline-limit=)
1402 Common RejectNegative Joined UInteger
1403 -finline-limit=<number> Limit the size of inlined functions to <number>
1406 Common Report Var(flag_inline_atomics) Init(1) Optimization
1407 Inline __atomic operations when a lock free instruction sequence is available.
1409 finstrument-functions
1410 Common Report Var(flag_instrument_function_entry_exit)
1411 Instrument function entry and exit with profiling calls
1413 finstrument-functions-exclude-function-list=
1414 Common RejectNegative Joined
1415 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1417 finstrument-functions-exclude-file-list=
1418 Common RejectNegative Joined
1419 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1422 Common Report Var(flag_ipa_cp) Optimization
1423 Perform interprocedural constant propagation
1426 Common Report Var(flag_ipa_cp_clone) Optimization
1427 Perform cloning to make Interprocedural constant propagation stronger
1430 Common Report Var(flag_ipa_profile) Init(0) Optimization
1431 Perform interprocedural profile propagation
1434 Common Report Var(flag_ipa_pta) Init(0) Optimization
1435 Perform interprocedural points-to analysis
1438 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1439 Discover pure and const functions
1442 Common Report Var(flag_ipa_reference) Init(0) Optimization
1443 Discover readonly and non addressable static variables
1447 Does nothing. Preserved for backward compatibility.
1451 Does nothing. Preserved for backward compatibility.
1454 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1455 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1458 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1461 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1464 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1467 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1468 -fira-region=[one|all|mixed] Set regions for IRA
1471 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1474 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1477 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1480 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1483 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1484 Use IRA based register pressure calculation
1485 in RTL hoist optimizations.
1488 Common Report Var(flag_ira_loop_pressure) Optimization
1489 Use IRA based register pressure calculation
1490 in RTL loop optimizations.
1492 fira-share-save-slots
1493 Common Report Var(flag_ira_share_save_slots) Init(1)
1494 Share slots for saving different hard registers.
1496 fira-share-spill-slots
1497 Common Report Var(flag_ira_share_spill_slots) Init(1)
1498 Share stack slots for spilled pseudo-registers.
1501 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1502 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1505 Common Report Var(flag_ivopts) Init(1) Optimization
1506 Optimize induction variables on trees
1509 Common Var(flag_jump_tables) Init(1) Optimization
1510 Use jump tables for sufficiently large switch statements
1512 fkeep-inline-functions
1513 Common Report Var(flag_keep_inline_functions)
1514 Generate code for functions even if they are fully inlined
1517 Common Report Var(flag_keep_static_consts) Init(1)
1518 Emit static const variables even if they are not used
1521 Common Report Var(flag_leading_underscore) Init(-1)
1522 Give external symbols a leading underscore
1526 Does nothing. Preserved for backward compatibility.
1530 Enable link-time optimization.
1533 Common RejectNegative Joined Var(flag_lto)
1534 Link-time optimization with number of parallel jobs or jobserver.
1537 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1540 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1543 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1546 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1549 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1552 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1555 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1556 Specify the algorithm to partition symbols and vars at linktime
1558 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1559 flto-compression-level=
1560 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1561 -flto-compression-level=<number> Use zlib compression level <number> for IL
1563 flto-odr-type-merging
1564 Common Report Var(flag_lto_odr_type_mering) Init(1)
1565 Merge C++ types using One Definition Rule
1568 Common Report Var(flag_lto_report) Init(0)
1569 Report various link-time optimization statistics
1572 Common Report Var(flag_lto_report_wpa) Init(0)
1573 Report various link-time optimization statistics for WPA only
1576 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1577 Set errno after built-in math functions
1580 Common Joined RejectNegative UInteger Var(flag_max_errors)
1581 -fmax-errors=<number> Maximum number of errors to report
1584 Common Report Var(mem_report)
1585 Report on permanent memory allocation
1588 Common Report Var(mem_report_wpa)
1589 Report on permanent memory allocation in WPA only
1591 ; This will attempt to merge constant section constants, if 1 only
1592 ; string constants and constants from constant pool, if 2 also constant
1594 fmerge-all-constants
1595 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1596 Attempt to merge identical constants and constant variables
1599 Common Report Var(flag_merge_constants,1) Optimization
1600 Attempt to merge identical constants across compilation units
1602 fmerge-debug-strings
1603 Common Report Var(flag_merge_debug_strings) Init(1)
1604 Attempt to merge identical debug strings across compilation units
1607 Common RejectNegative Joined UInteger
1608 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1611 Common Report Var(flag_modulo_sched) Optimization
1612 Perform SMS based modulo scheduling before the first scheduling pass
1614 fmodulo-sched-allow-regmoves
1615 Common Report Var(flag_modulo_sched_allow_regmoves)
1616 Perform SMS based modulo scheduling with register moves allowed
1618 fmove-loop-invariants
1619 Common Report Var(flag_move_loop_invariants) Optimization
1620 Move loop invariant computations out of loops
1623 Common Var(flag_dce) Init(1) Optimization
1624 Use the RTL dead code elimination pass
1627 Common Var(flag_dse) Init(1) Optimization
1628 Use the RTL dead store elimination pass
1630 freschedule-modulo-scheduled-loops
1631 Common Report Var(flag_resched_modulo_sched) Optimization
1632 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1634 fnon-call-exceptions
1635 Common Report Var(flag_non_call_exceptions) Optimization
1636 Support synchronous non-call exceptions
1639 Common Report Var(flag_omit_frame_pointer) Optimization
1640 When possible do not generate stack frames
1643 Common Report Var(flag_opt_info) Optimization
1644 Enable all optimization info dumps on stderr
1647 Common Joined RejectNegative Var(common_deferred_options) Defer
1648 -fopt-info[-<type>=filename] Dump compiler optimization details
1650 foptimize-register-move
1652 Does nothing. Preserved for backward compatibility.
1654 foptimize-sibling-calls
1655 Common Report Var(flag_optimize_sibling_calls) Optimization
1656 Optimize sibling and tail recursive calls
1659 Common Report Var(flag_partial_inlining)
1660 Perform partial inlining
1663 Common Report Var(pre_ipa_mem_report)
1664 Report on memory allocation before interprocedural optimization
1666 fpost-ipa-mem-report
1667 Common Report Var(post_ipa_mem_report)
1668 Report on memory allocation before interprocedural optimization
1671 Common Report Var(flag_pack_struct) Optimization
1672 Pack structure members together without holes
1675 Common RejectNegative Joined UInteger Optimization
1676 -fpack-struct=<number> Set initial maximum structure member alignment
1679 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1680 Return small aggregates in memory, not registers
1683 Common Report Var(flag_peel_loops) Optimization
1684 Perform loop peeling
1687 Common Report Var(flag_no_peephole,0) Optimization
1688 Enable machine specific peephole optimizations
1691 Common Report Var(flag_peephole2) Optimization
1692 Enable an RTL peephole pass before sched2
1695 Common Report Var(flag_pic,2) Negative(fPIE)
1696 Generate position-independent code if possible (large mode)
1699 Common Report Var(flag_pie,2) Negative(fpic)
1700 Generate position-independent code for executables if possible (large mode)
1703 Common Report Var(flag_pic,1) Negative(fpie)
1704 Generate position-independent code if possible (small mode)
1707 Common Report Var(flag_pie,1) Negative(fPIC)
1708 Generate position-independent code for executables if possible (small mode)
1711 Common Joined RejectNegative Var(common_deferred_options) Defer
1712 Specify a plugin to load
1715 Common Joined RejectNegative Var(common_deferred_options) Defer
1716 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1718 fpredictive-commoning
1719 Common Report Var(flag_predictive_commoning) Optimization
1720 Run predictive commoning optimization.
1722 fprefetch-loop-arrays
1723 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1724 Generate prefetch instructions, if available, for arrays in loops
1727 Common Report Var(profile_flag)
1728 Enable basic program profiling code
1731 Common Report Var(profile_arc_flag)
1732 Insert arc-based program profiling code
1735 Common Joined RejectNegative Var(profile_data_prefix)
1736 Set the top-level directory for storing the profile data.
1737 The default is 'pwd'.
1740 Common Report Var(flag_profile_correction)
1741 Enable correction of flow inconsistent profile data input
1745 Enable common options for generating profile info for profile feedback directed optimizations
1748 Common Joined RejectNegative
1749 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1752 Common Var(flag_profile_use)
1753 Enable common options for performing profile feedback directed optimizations
1756 Common Joined RejectNegative
1757 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1760 Common Report Var(flag_profile_values)
1761 Insert code to profile values of expressions
1764 Common Report Var(profile_report)
1765 Report on consistency of profile
1767 fprofile-reorder-functions
1768 Common Report Var(flag_profile_reorder_functions)
1769 Enable function reordering that improves code placement
1772 Common Var(common_deferred_options) Defer
1775 Common Joined RejectNegative Var(common_deferred_options) Defer
1776 -frandom-seed=<string> Make compile reproducible using <string>
1778 ; This switch causes the command line that was used to create an
1779 ; object file to be recorded into the object file. The exact format
1780 ; of this recording is target and binary file format dependent.
1781 ; It is related to the -fverbose-asm switch, but that switch only
1782 ; records information in the assembler output file as comments, so
1783 ; they never reach the object file.
1784 frecord-gcc-switches
1785 Common Report Var(flag_record_gcc_switches)
1786 Record gcc command line switches in the object file.
1789 Common Report Var(flag_pcc_struct_return,0) Optimization
1790 Return small aggregates in registers
1794 Does nothing. Preserved for backward compatibility.
1796 flive-range-shrinkage
1797 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
1798 Relief of register pressure through live range shrinkage
1801 Common Report Var(flag_rename_registers) Init(2) Optimization
1802 Perform a register renaming optimization pass
1805 Common Report Var(flag_reorder_blocks) Optimization
1806 Reorder basic blocks to improve code placement
1808 freorder-blocks-and-partition
1809 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1810 Reorder basic blocks and partition into hot and cold sections
1813 Common Report Var(flag_reorder_functions) Optimization
1814 Reorder functions to improve code placement
1816 frerun-cse-after-loop
1817 Common Report Var(flag_rerun_cse_after_loop) Optimization
1818 Add a common subexpression elimination pass after loop optimizations
1822 Does nothing. Preserved for backward compatibility.
1825 Common Report Var(flag_rounding_math) Optimization SetByCombined
1826 Disable optimizations that assume default FP rounding behavior
1829 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1830 Enable scheduling across basic blocks
1833 Common Report Var(flag_sched_pressure) Init(0) Optimization
1834 Enable register pressure sensitive insn scheduling
1837 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1838 Allow speculative motion of non-loads
1841 Common Report Var(flag_schedule_speculative_load) Optimization
1842 Allow speculative motion of some loads
1844 fsched-spec-load-dangerous
1845 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1846 Allow speculative motion of more loads
1849 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1850 -fsched-verbose=<number> Set the verbosity level of the scheduler
1852 fsched2-use-superblocks
1853 Common Report Var(flag_sched2_use_superblocks) Optimization
1854 If scheduling post reload, do superblock scheduling
1858 Does nothing. Preserved for backward compatibility.
1861 Common Report Var(flag_schedule_insns) Optimization
1862 Reschedule instructions before register allocation
1865 Common Report Var(flag_schedule_insns_after_reload) Optimization
1866 Reschedule instructions after register allocation
1868 ; This flag should be on when a target implements non-trivial
1869 ; scheduling hooks, maybe saving some information for its own sake.
1870 ; On IA64, for example, this is used for correct bundling.
1871 fselective-scheduling
1872 Common Report Var(flag_selective_scheduling) Optimization
1873 Schedule instructions using selective scheduling algorithm
1875 fselective-scheduling2
1876 Common Report Var(flag_selective_scheduling2) Optimization
1877 Run selective scheduling after reload
1879 fsel-sched-pipelining
1880 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1881 Perform software pipelining of inner loops during selective scheduling
1883 fsel-sched-pipelining-outer-loops
1884 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1885 Perform software pipelining of outer loops during selective scheduling
1887 fsel-sched-reschedule-pipelined
1888 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1889 Reschedule pipelined regions without pipelining
1891 fsemantic-interposition
1892 Common Report Var(flag_semantic_interposition) Init(1)
1893 Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker
1895 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1896 ; of stalled insns into the ready list.
1897 fsched-stalled-insns
1898 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1899 Allow premature scheduling of queued insns
1901 fsched-stalled-insns=
1902 Common RejectNegative Joined UInteger
1903 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1905 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1906 ; be examined for a dependency on a stalled insn that is candidate for
1907 ; premature removal from the queue of stalled insns into the ready list (has
1908 ; an effect only if the flag 'sched_stalled_insns' is set).
1909 fsched-stalled-insns-dep
1910 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1911 Set dependence distance checking in premature scheduling of queued insns
1913 fsched-stalled-insns-dep=
1914 Common RejectNegative Joined UInteger
1915 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1917 fsched-group-heuristic
1918 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1919 Enable the group heuristic in the scheduler
1921 fsched-critical-path-heuristic
1922 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1923 Enable the critical path heuristic in the scheduler
1925 fsched-spec-insn-heuristic
1926 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1927 Enable the speculative instruction heuristic in the scheduler
1929 fsched-rank-heuristic
1930 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1931 Enable the rank heuristic in the scheduler
1933 fsched-last-insn-heuristic
1934 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1935 Enable the last instruction heuristic in the scheduler
1937 fsched-dep-count-heuristic
1938 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1939 Enable the dependent count heuristic in the scheduler
1942 Common Report Var(flag_section_anchors) Optimization
1943 Access data in the same section from shared anchor points
1947 Does nothing. Preserved for backward compatibility.
1951 Does nothing. Preserved for backward compatibility.
1954 Common Report Var(flag_ree) Init(0)
1955 Turn on Redundant Extensions Elimination pass.
1958 Common Report Var(flag_show_column) Init(1)
1959 Show column numbers in diagnostics, when available. Default on
1962 Common Report Var(flag_shrink_wrap) Optimization
1963 Emit function prologues only before parts of the function that need it,
1964 rather than at the top of the function.
1967 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1968 Disable optimizations observable by IEEE signaling NaNs
1971 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1972 Disable floating point optimizations that ignore the IEEE signedness of zero
1974 fsingle-precision-constant
1975 Common Report Var(flag_single_precision_constant) Optimization
1976 Convert floating point constants to single precision constants
1978 fsplit-ivs-in-unroller
1979 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1980 Split lifetimes of induction variables when loops are unrolled
1983 Common Report Var(flag_split_stack) Init(-1)
1984 Generate discontiguous stack frames
1987 Common Report Var(flag_split_wide_types) Optimization
1988 Split wide types into independent registers
1991 Common Report Var(flag_ssa_phiopt) Optimization
1992 Optimize conditional patterns using SSA PHI nodes
1994 fvariable-expansion-in-unroller
1995 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1996 Apply variable expansion when loops are unrolled
1999 Common Report RejectNegative Joined
2000 -fstack-check=[no|generic|specific] Insert stack checking code into the program
2003 Common Alias(fstack-check=, specific, no)
2004 Insert stack checking code into the program. Same as -fstack-check=specific
2007 Common Var(common_deferred_options) Defer
2009 fstack-limit-register=
2010 Common RejectNegative Joined Var(common_deferred_options) Defer
2011 -fstack-limit-register=<register> Trap if the stack goes past <register>
2013 fstack-limit-symbol=
2014 Common RejectNegative Joined Var(common_deferred_options) Defer
2015 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
2018 Common Report Var(flag_stack_protect, 1)
2019 Use propolice as a stack protection method
2021 fstack-protector-all
2022 Common Report RejectNegative Var(flag_stack_protect, 2)
2023 Use a stack protection method for every function
2025 fstack-protector-strong
2026 Common Report RejectNegative Var(flag_stack_protect, 3)
2027 Use a smart stack protection method for certain functions
2030 Common RejectNegative Var(flag_stack_usage)
2031 Output stack usage information on a per-function basis
2035 Does nothing. Preserved for backward compatibility.
2037 ; Nonzero if we should do (language-dependent) alias analysis.
2038 ; Typically, this analysis will assume that expressions of certain
2039 ; types do not alias expressions of certain other types. Only used
2040 ; if alias analysis (in general) is enabled.
2042 Common Report Var(flag_strict_aliasing) Optimization
2043 Assume strict aliasing rules apply
2046 Common Report Var(flag_strict_overflow)
2047 Treat signed overflow as undefined
2050 Common Report Var(flag_sync_libcalls) Init(1)
2051 Implement __atomic operations via libcalls to legacy __sync functions
2054 Common Report Var(flag_syntax_only)
2055 Check for syntax errors, then stop
2058 Common Report Var(flag_test_coverage)
2059 Create data files needed by \"gcov\"
2062 Common Report Var(flag_thread_jumps) Optimization
2063 Perform jump threading optimizations
2066 Common Report Var(time_report)
2067 Report the time taken by each compiler pass
2070 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2071 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
2074 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2077 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2080 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2083 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2086 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2089 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
2090 Reorder top level functions, variables, and asms
2093 Common Report Var(flag_tracer)
2094 Perform superblock formation via tail duplication
2096 ; Zero means that floating-point math operations cannot generate a
2097 ; (user-visible) trap. This is the case, for example, in nonstop
2098 ; IEEE 754 arithmetic.
2100 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2101 Assume floating-point operations can trap
2104 Common Report Var(flag_trapv) Optimization
2105 Trap for signed overflow in addition, subtraction and multiplication
2108 Common Report Var(flag_tree_ccp) Optimization
2109 Enable SSA-CCP optimization on trees
2112 Common Report Var(flag_tree_bit_ccp) Optimization
2113 Enable SSA-BIT-CCP optimization on trees
2117 Does nothing. Preserved for backward compatibility.
2120 Common Report Var(flag_tree_ch) Optimization
2121 Enable loop header copying on trees
2123 ftree-coalesce-inlined-vars
2124 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2125 Enable coalescing of copy-related user variables that are inlined
2128 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2129 Enable coalescing of all copy-related user variables
2132 Common Report Var(flag_tree_copyrename) Optimization
2133 Replace SSA temporaries with better names in copies
2136 Common Report Var(flag_tree_copy_prop) Optimization
2137 Enable copy propagation on trees
2139 ftree-store-copy-prop
2141 Does nothing. Preserved for backward compatibility.
2144 Common Report Var(flag_tree_cselim) Init(2) Optimization
2145 Transform condition stores into unconditional ones
2147 ftree-switch-conversion
2148 Common Report Var(flag_tree_switch_conversion) Optimization
2149 Perform conversions of switch initializations.
2152 Common Report Var(flag_tree_dce) Optimization
2153 Enable SSA dead code elimination optimization on trees
2155 ftree-dominator-opts
2156 Common Report Var(flag_tree_dom) Optimization
2157 Enable dominator optimizations
2160 Common Report Var(flag_tree_tail_merge) Optimization
2161 Enable tail merging on trees
2164 Common Report Var(flag_tree_dse) Optimization
2165 Enable dead store elimination
2168 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2169 Enable forward propagation on trees
2172 Common Report Var(flag_tree_fre) Optimization
2173 Enable Full Redundancy Elimination (FRE) on trees
2176 Common Report Var(flag_optimize_strlen) Optimization
2177 Enable string length optimizations on trees
2179 fisolate-erroneous-paths-dereference
2180 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2181 Detect paths which trigger erroneous or undefined behaviour due to
2182 dereferencing a NULL pointer. Isolate those paths from the main control
2183 flow and turn the statement with erroneous or undefined behaviour into a trap.
2185 fisolate-erroneous-paths-attribute
2186 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2187 Detect paths which trigger erroneous or undefined behaviour due a NULL value
2188 being used in a way which is forbidden by a returns_nonnull or nonnull
2189 attribute. Isolate those paths from the main control flow and turn the
2190 statement with erroneous or undefined behaviour into a trap.
2192 ftree-loop-distribution
2193 Common Report Var(flag_tree_loop_distribution) Optimization
2194 Enable loop distribution on trees
2196 ftree-loop-distribute-patterns
2197 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2198 Enable loop distribution for patterns transformed into a library call
2201 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2202 Enable loop invariant motion on trees
2205 Common Alias(floop-interchange)
2206 Enable loop interchange transforms. Same as -floop-interchange
2209 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2210 Create canonical induction variables in loops
2213 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2214 Enable loop optimizations on tree level
2216 ftree-parallelize-loops=
2217 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2218 Enable automatic parallelization of loops
2221 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2222 Enable hoisting loads from conditional pointers.
2225 Common Report Var(flag_tree_pre) Optimization
2226 Enable SSA-PRE optimization on trees
2229 Common Report Var(flag_tree_partial_pre) Optimization
2230 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2233 Common Report Var(flag_tree_pta) Optimization
2234 Perform function-local points-to analysis on trees.
2237 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2238 Enable reassociation on tree level
2242 Does nothing. Preserved for backward compatibility.
2245 Common Report Var(flag_tree_sink) Optimization
2246 Enable SSA code sinking on trees
2249 Common Report Var(flag_tree_slsr) Optimization
2250 Perform straight-line strength reduction
2253 Common Report Var(flag_tree_sra) Optimization
2254 Perform scalar replacement of aggregates
2257 Common Report Var(flag_tree_ter) Optimization
2258 Replace temporary expressions in the SSA->normal pass
2261 Common Report Var(flag_tree_live_range_split) Optimization
2262 Perform live range splitting during the SSA->normal pass
2265 Common Report Var(flag_tree_vrp) Init(0) Optimization
2266 Perform Value Range Propagation on trees
2269 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2270 Compile whole compilation unit at a time
2273 Common Report Var(flag_unroll_loops) Optimization
2274 Perform loop unrolling when iteration count is known
2277 Common Report Var(flag_unroll_all_loops) Optimization
2278 Perform loop unrolling for all loops
2280 ; Nonzero means that loop optimizer may assume that the induction variables
2281 ; that control loops do not overflow and that the loops with nontrivial
2282 ; exit condition are not infinite
2283 funsafe-loop-optimizations
2284 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2285 Allow loop optimizations to assume that the loops behave in normal way
2288 Common Report Var(flag_associative_math) SetByCombined
2289 Allow optimization for floating-point arithmetic which may change the
2290 result of the operation due to rounding.
2293 Common Report Var(flag_reciprocal_math) SetByCombined
2294 Same as -fassociative-math for expressions which include division.
2296 ; Nonzero means that unsafe floating-point math optimizations are allowed
2297 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2298 ; are allowed to assume that their arguments and results are "normal"
2299 ; (e.g., nonnegative for SQRT).
2300 funsafe-math-optimizations
2301 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2302 Allow math optimizations that may violate IEEE or ISO standards
2305 Common Report Var(flag_unswitch_loops) Optimization
2306 Perform loop unswitching
2309 Common Report Var(flag_unwind_tables) Optimization
2310 Just generate unwind tables for exception handling
2313 Common Driver Negative(fuse-ld=gold)
2314 Use the bfd linker instead of the default linker
2317 Common Driver Negative(fuse-ld=bfd)
2318 Use the gold linker instead of the default linker
2321 Common Undocumented Var(flag_use_linker_plugin)
2323 ; Positive if we should track variables, negative if we should run
2324 ; the var-tracking pass only to discard debug annotations, zero if
2325 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2326 ; will be set according to optimize, debug_info_level and debug_hooks
2327 ; in process_options ().
2329 Common Report Var(flag_var_tracking) Init(2) Optimization
2330 Perform variable tracking
2332 ; Positive if we should track variables at assignments, negative if
2333 ; we should run the var-tracking pass only to discard debug
2334 ; annotations. When flag_var_tracking_assignments ==
2335 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2336 fvar-tracking-assignments
2337 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2338 Perform variable tracking by annotating assignments
2340 ; Nonzero if we should toggle flag_var_tracking_assignments after
2341 ; processing options and computing its default. */
2342 fvar-tracking-assignments-toggle
2343 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2344 Toggle -fvar-tracking-assignments
2346 ; Positive if we should track uninitialized variables, negative if
2347 ; we should run the var-tracking pass only to discard debug
2348 ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
2349 ; will be set according to flag_var_tracking.
2350 fvar-tracking-uninit
2351 Common Report Var(flag_var_tracking_uninit) Optimization
2352 Perform variable tracking and also tag variables that are uninitialized
2355 Common Report Var(flag_tree_vectorize) Optimization
2356 Enable vectorization on trees
2358 ftree-vectorizer-verbose=
2359 Common Joined RejectNegative Ignore
2360 Does nothing. Preserved for backward compatibility.
2362 ftree-loop-vectorize
2363 Common Report Var(flag_tree_loop_vectorize) Optimization
2364 Enable loop vectorization on trees
2367 Common Report Var(flag_tree_slp_vectorize) Optimization
2368 Enable basic block vectorization (SLP) on trees
2371 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT)
2372 Specifies the cost model for vectorization
2375 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED)
2376 Specifies the vectorization cost model for code marked with a simd directive
2379 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2382 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2385 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2388 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2391 Common RejectNegative Alias(fvect-cost-model=,dynamic)
2392 Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
2395 Common RejectNegative Alias(fvect-cost-model=,unlimited)
2396 Enables the unlimited vectorizer cost model. Preserved for backward compatibility.
2398 ftree-vect-loop-version
2400 Does nothing. Preserved for backward compatibility.
2403 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2404 Enable copy propagation of scalar-evolution information.
2406 ; -fverbose-asm causes extra commentary information to be produced in
2407 ; the generated assembly code (to make it more readable). This option
2408 ; is generally only of use to those who actually need to read the
2409 ; generated assembly code (perhaps while debugging the compiler itself).
2410 ; -fno-verbose-asm, the default, causes the extra information
2411 ; to not be added and is useful when comparing two assembler files.
2413 Common Report Var(flag_verbose_asm)
2414 Add extra commentary to assembler output
2417 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2418 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2421 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2424 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2427 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2430 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2433 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2436 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2437 Validate vtable pointers before using them.
2440 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2443 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2446 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2449 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2452 Common Var(flag_vtv_counts)
2453 Output vtable verification counters.
2456 Common Var(flag_vtv_debug)
2457 Output vtable verification pointer sets information.
2460 Common Report Var(flag_value_profile_transformations) Optimization
2461 Use expression value profiles in optimizations
2464 Common Report Var(flag_web) Init(2) Optimization
2465 Construct webs and split unrelated uses of single variable
2467 ftree-builtin-call-dce
2468 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2469 Enable conditional dead code elimination for builtin calls
2472 Common Report Var(flag_whole_program) Init(0) Optimization
2473 Perform whole program optimizations
2476 Common Report Var(flag_wrapv) Optimization
2477 Assume signed arithmetic overflow wraps around
2479 fzero-initialized-in-bss
2480 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2481 Put zero initialized data in the bss section
2484 Common JoinedOrMissing
2485 Generate debug information in default format
2488 Common JoinedOrMissing Negative(gdwarf)
2489 Generate debug information in COFF format
2492 Common JoinedOrMissing Negative(gdwarf-)
2493 Generate debug information in default version of DWARF format
2496 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2497 Generate debug information in DWARF v2 (or later) format
2500 Common JoinedOrMissing
2501 Generate debug information in default extended format
2504 Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2505 Don't generate DWARF pubnames and pubtypes sections.
2508 Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2509 Generate DWARF pubnames and pubtypes sections.
2512 Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2513 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2515 gno-record-gcc-switches
2516 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2517 Don't record gcc command line switches in DWARF DW_AT_producer.
2519 grecord-gcc-switches
2520 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2521 Record gcc command line switches in DWARF DW_AT_producer.
2524 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2525 Don't generate debug information in separate .dwo files
2528 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2529 Generate debug information in separate .dwo files
2532 Common JoinedOrMissing Negative(gstabs+)
2533 Generate debug information in STABS format
2536 Common JoinedOrMissing Negative(gvms)
2537 Generate debug information in extended STABS format
2540 Common RejectNegative Var(dwarf_strict,0) Init(0)
2541 Emit DWARF additions beyond selected version
2544 Common Report RejectNegative Var(dwarf_strict,1)
2545 Don't emit DWARF additions beyond selected version
2548 Common Report Var(flag_gtoggle)
2549 Toggle debug information generation
2552 Common JoinedOrMissing Negative(gxcoff)
2553 Generate debug information in VMS format
2556 Common JoinedOrMissing Negative(gxcoff+)
2557 Generate debug information in XCOFF format
2560 Common JoinedOrMissing Negative(gcoff)
2561 Generate debug information in extended XCOFF format
2564 Name(compressed_debug_sections) Type(int)
2566 ; Since -gz= is completely handled in specs, the values aren't used and we
2567 ; assign arbitrary constants.
2569 Enum(compressed_debug_sections) String(none) Value(0)
2572 Enum(compressed_debug_sections) String(zlib) Value(1)
2575 Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
2579 Generate compressed debug sections
2582 Common Driver Joined Enum(compressed_debug_sections)
2583 -gz=<format> Generate compressed debug sections in format <format>
2586 Driver Joined Separate
2589 Common Joined Var(plugindir_string) Init(0)
2590 -iplugindir=<dir> Set <dir> to be the default plugin directory
2593 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2594 -imultiarch <dir> Set <dir> to be the multiarch include subdirectory
2597 Driver Joined Separate
2602 no-canonical-prefixes
2615 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2616 -o <file> Place output into <file>
2619 Common Var(profile_flag)
2620 Enable function profiling
2623 Driver Var(pass_exit_codes)
2626 Common Alias(Wpedantic)
2629 Common Var(flag_pedantic_errors)
2630 Like -pedantic but issue them as errors
2636 Driver Var(use_pipes)
2639 Driver JoinedOrMissing Var(print_file_name)
2641 print-libgcc-file-name
2644 print-multi-directory
2645 Driver Var(print_multi_directory)
2648 Driver Var(print_multi_lib)
2650 print-multi-os-directory
2651 Driver Var(print_multi_os_directory)
2654 Driver Var(print_multiarch)
2657 Driver JoinedOrMissing Var(print_prog_name)
2660 Driver Var(print_search_dirs)
2663 Driver Var(print_sysroot)
2665 print-sysroot-headers-suffix
2666 Driver Var(print_sysroot_headers_suffix)
2669 Common Var(quiet_flag) RejectDriver
2670 Do not display functions compiled or elapsed time
2688 Driver Var(report_times)
2691 Driver JoinedOrMissing
2694 Driver Joined Separate
2698 ; C option, but driver must not handle as "-u ndef".
2701 Common Driver Var(verbose_flag)
2702 Enable verbose output
2705 Common Var(version_flag) RejectDriver
2706 Display the compiler's version
2709 Common Var(inhibit_warnings)
2713 Driver Separate Var(wrapper_string)
2716 Driver Joined Separate
2719 Driver RejectNegative Negative(pie)
2720 Create a shared library
2726 Driver Separate Alias(specs=)
2739 ; Documented for Fortran, but always accepted by driver.
2746 ; Documented for Go, but always accepted by driver.
2764 Driver RejectNegative Negative(shared)
2765 Create a position independent executable
2768 Driver Joined Separate
2771 Common Report Var(flag_use_caller_save) Optimization
2772 Use caller save register across calls if possible
2774 ; This comment is to ensure we retain the blank line above.