1 ; Options for the language- and target-independent parts of the compiler.
3 ; Copyright (C) 2003-2013 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
220 Driver Alias(coverage)
226 Common Separate Alias(d)
229 Common Joined Alias(d)
232 Common Separate Alias(dumpbase)
235 Common Separate Alias(dumpdir)
238 Driver Separate Alias(e)
241 Driver Joined Alias(e)
244 Common Warning Alias(Wextra)
247 Driver Separate Alias(Xassembler)
250 Driver JoinedOrMissing Alias(Xassembler)
253 Driver Separate Alias(Xlinker)
256 Driver JoinedOrMissing Alias(Xlinker)
259 Driver Separate Alias(u)
262 Driver Joined Alias(u)
265 Common Driver Var(help_flag)
266 Display this information
269 Common Driver Report Joined
270 --help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params
273 Driver Separate Alias(x)
276 Driver Joined Alias(x)
279 Driver Separate Alias(L)
282 Driver Joined Alias(L)
284 -no-canonical-prefixes
285 Driver Alias(no-canonical-prefixes)
288 Driver Alias(canonical-prefixes)
290 -no-standard-libraries
291 Driver Alias(nostdlib)
294 Driver Var(no_sysroot_suffix)
303 Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
306 Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
309 Driver Alias(pass-exit-codes)
312 Common Alias(Wpedantic)
315 Common Alias(pedantic-errors)
324 Driver Separate Alias(B)
327 Driver JoinedOrMissing Alias(B)
333 Driver Separate Alias(print-file-name=)
336 Driver JoinedOrMissing Alias(print-file-name=)
338 -print-libgcc-file-name
339 Driver Alias(print-libgcc-file-name)
341 -print-multi-directory
342 Driver Alias(print-multi-directory)
345 Driver Alias(print-multi-lib)
347 -print-multi-os-directory
348 Driver Alias(print-multi-os-directory)
351 Driver Alias(print-multiarch)
354 Driver Separate Alias(print-prog-name=)
357 Driver JoinedOrMissing Alias(print-prog-name=)
360 Driver Alias(print-search-dirs)
363 Driver Alias(print-sysroot)
365 -print-sysroot-headers-suffix
366 Driver Alias(print-sysroot-headers-suffix)
372 Driver Alias(save-temps)
378 Driver Separate Alias(specs=)
381 Driver Joined Alias(specs=)
387 Driver Alias(symbolic)
391 Alias for --help=target
399 ;; The driver used to convert options such as --help into forms such
400 ;; as -fhelp; the following four entries are for compatibility with
401 ;; any direct uses of those (undocumented) -f forms
403 Common Driver Alias(-help)
406 Common Driver Joined Alias(-help=)
409 Common Driver Alias(-target-help)
412 Common Driver Alias(-version)
416 --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
419 Common Joined Alias(-param)
422 Driver Separate Alias(-sysroot=)
425 Driver JoinedOrMissing
431 Driver Joined Separate
437 Driver Joined Separate
443 Common JoinedOrMissing Optimization
444 -O<number> Set optimization level to <number>
448 Optimize for space rather than speed
452 Optimize for speed disregarding exact standards compliance
456 Optimize for debugging experience rather than speed or size
468 Driver Joined Separate
474 Driver Joined Separate
495 Common RejectNegative Warning Alias(Wextra)
496 This switch is deprecated; use -Wextra instead
499 Driver JoinedOrMissing
502 Driver JoinedOrMissing
505 Driver JoinedOrMissing
508 Common Var(warn_aggregate_return) Warning
509 Warn about returning structures, unions or arrays
511 Waggressive-loop-optimizations
512 Common Var(warn_aggressive_loop_optimizations) Init(1) Warning
513 Warn if a loop with constant number of iterations triggers undefined behavior
516 Common Var(warn_array_bounds) Warning
517 Warn if an array is accessed out of bounds
520 Common Var(warn_attributes) Init(1) Warning
521 Warn about inappropriate attribute usage
524 Common Var(warn_cast_align) Warning
525 Warn about pointer casts which increase alignment
528 Common Var(warn_cpp) Init(1) Warning
529 Warn when a #warning directive is encountered
531 Wdeprecated-declarations
532 Common Var(warn_deprecated_decl) Init(1) Warning
533 Warn about uses of __attribute__((deprecated)) declarations
535 Wdisabled-optimization
536 Common Var(warn_disabled_optimization) Warning
537 Warn when an optimization pass is disabled
540 Common Var(warnings_are_errors)
541 Treat all warnings as errors
545 Treat specified warning as error
548 Common Var(extra_warnings) Warning
549 Print extra (possibly unwanted) warnings
552 Common Var(flag_fatal_errors)
553 Exit on the first error occurred
556 Common Var(flag_force_warnings)
557 Disable promoting warnings to errors
560 Common RejectNegative Joined UInteger
561 -Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
564 Common Var(warn_free_nonheap_object) Init(1) Warning
565 Warn when attempting to free a non-heap object
568 Common Var(warn_inline) Warning
569 Warn when an inlined function cannot be inlined
571 Winvalid-memory-model
572 Common Var(warn_invalid_memory_model) Init(1) Warning
573 Warn when an atomic memory model parameter is known to be outside the valid range.
576 Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
579 Common RejectNegative Joined UInteger Warning
580 -Wlarger-than=<number> Warn if an object is larger than <number> bytes
582 Wunsafe-loop-optimizations
583 Common Var(warn_unsafe_loop_optimizations) Warning
584 Warn if the loop cannot be optimized due to nontrivial assumptions.
587 Common Alias(Wsuggest-attribute=noreturn)
590 Common Var(warn_overflow) Init(1) Warning
591 Warn about overflow in arithmetic expressions
594 Common Var(warn_packed) Warning
595 Warn when the packed attribute has no effect on struct layout
598 Common Var(warn_padded) Warning
599 Warn when padding is required to align structure members
602 Common Var(warn_ripa_opt_mismatch) Warning EnabledBy(Wall)
603 Warn if primary and auxiliary modules have mismatched command line options
606 Common Var(warn_self_assign) Init(0) Warning
607 Warn when a variable is assigned to itself
610 Common Var(pedantic) Warning
611 Issue warnings needed for strict compliance to the standard
614 Common Var(warn_shadow) Warning
615 Warn when one local variable shadows another
618 Common Var(warn_shadow_local) Warning
619 Warn when one local variable shadows another local variable or parameter
621 Wshadow-compatible-local
622 Common Var(warn_shadow_compatible_local) Warning
623 Warn when one local variable shadows another local variable or parameter
627 Common Var(warn_stack_protect) Warning
628 Warn when not issuing stack smashing protection for some reason
631 Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
632 Warn if stack usage might be larger than specified amount
636 Warn about code which might break strict aliasing rules
639 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
640 Warn about code which might break strict aliasing rules
644 Warn about optimizations that assume that signed overflow is undefined
647 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
648 Warn about optimizations that assume that signed overflow is undefined
650 Wsuggest-attribute=const
651 Common Var(warn_suggest_attribute_const) Warning
652 Warn about functions which might be candidates for __attribute__((const))
654 Wsuggest-attribute=pure
655 Common Var(warn_suggest_attribute_pure) Warning
656 Warn about functions which might be candidates for __attribute__((pure))
658 Wsuggest-attribute=noreturn
659 Common Var(warn_suggest_attribute_noreturn) Warning
660 Warn about functions which might be candidates for __attribute__((noreturn))
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
670 ; FIXME. The following -Wthread-* flags are placeholders to prevent
671 ; confusing the compiler when applications are built with these flags.
672 ; Actual support for these flags is being implemented in the
673 ; thread-annotations branch.
675 Common Var(warn_thread_safety) Warning
676 Warn about potential thread safety issues when the code is annotated with thread safety attributes
678 Wthread-safety-analysis
680 Does nothing. For compatibility with clang thread safety analysis.
682 Wthread-safety-attributes
684 Does nothing. For compatibility with clang thread safety analysis.
686 Wthread-safety-precise
688 Does nothing. For compatibility with clang thread safety analysis.
690 Wthread-unguarded-var
691 Common Var(warn_thread_unguarded_var) Init(1) Warning
692 Warn about shared variables not properly protected by locks specified in the attributes
694 Wthread-unguarded-func
695 Common Var(warn_thread_unguarded_func) Init(1) Warning
696 Warn about function calls not properly protected by locks specified in the attributes
698 Wthread-mismatched-lock-order
699 Common Var(warn_thread_mismatched_lock_order) Init(1) Warning
700 Warn about lock acquisition order inconsistent with what specified in the attributes
702 Wthread-mismatched-lock-acq-rel
703 Common Var(warn_thread_mismatched_lock_acq_rel) Init(1) Warning
704 Warn about mismatched lock acquisition and release
706 Wthread-reentrant-lock
707 Common Var(warn_thread_reentrant_lock) Init(1) Warning
708 Warn about a lock being acquired recursively
710 Wthread-unsupported-lock-name
711 Common Var(warn_unsupported_lock_name) Init(0) Warning
712 Warn about uses of unsupported lock names in attributes
715 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
716 Warn if a comparison is always true or always false due to the limited range of the data type
719 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
720 Warn about uninitialized automatic variables
723 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
724 Warn about maybe uninitialized automatic variables
728 Does nothing. Preserved for backward compatibility.
731 Common Var(warn_unused) Init(0) Warning
732 Enable all -Wunused- warnings
734 Wunused-but-set-parameter
735 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
736 Warn when a function parameter is only set, otherwise unused
738 Wunused-but-set-variable
739 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
740 Warn when a variable is only set, otherwise unused
743 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
744 Warn when a function is unused
747 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
748 Warn when a label is unused
751 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
752 Warn when a function parameter is unused
755 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
756 Warn when an expression value is unused
759 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
760 Warn when a variable is unused
763 Common Var(warn_coverage_mismatch) Init(1) Warning
764 Warn in case profiles in -fprofile-use do not match
766 Wvector-operation-performance
767 Common Var(warn_vector_operation_performance) Warning
768 Warn when a vector operation is compiled outside the SIMD
786 Common Separate Var(aux_info_file_name)
787 -aux-info <file> Emit declaration information into <file>
790 Common Joined Alias(aux-info)
793 Common Separate RejectDriver Var(aux_base_name)
796 Common Separate RejectDriver
806 -d<letters> Enable dumps from specific passes of the compiler
809 Common Separate Var(dump_base_name)
810 -dumpbase <file> Set the file basename to be used for dumps
813 Common Separate Var(dump_dir_name)
814 -dumpdir <dir> Set the directory name to be used for dumps
826 Driver Joined Separate
828 ; This option has historically been passed down to the linker by an
829 ; accident of a %{e*} spec, so ensure it continues to be passed down
830 ; as a single option. The supported option for this purpose is
831 ; -rdynamic. See PR 47390.
835 ; The version of the C++ ABI in use. The following values are allowed:
837 ; 0: The version of the ABI believed most conformant with the C++ ABI
838 ; specification. This ABI may change as bugs are discovered and fixed.
839 ; Therefore, 0 will not necessarily indicate the same ABI in different
842 ; 1: The version of the ABI first used in G++ 3.2.
844 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
846 ; 3: The version of the ABI that fixes the missing underscore
847 ; in template non-type arguments of pointer type.
849 ; 4: The version of the ABI that introduces unambiguous mangling of
850 ; vector types. First selectable in G++ 4.5.
852 ; 5: The version of the ABI that ignores attribute const/noreturn
853 ; in function pointer mangling, and corrects mangling of decltype and
854 ; function parameters used in other parameters and the return type.
855 ; First selectable in G++ 4.6.
857 ; 6: The version of the ABI that doesn't promote scoped enums to int and
858 ; changes the mangling of template argument packs, const/static_cast,
859 ; prefix ++ and --, and a class scope function used as a template
861 ; First selectable in G++ 4.7.
863 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
864 ; corrects the mangling of lambdas in default argument scope.
865 ; First selectable in G++ 4.8.
866 ; Additional positive integers will be assigned as new versions of
867 ; the ABI become the default version of the ABI.
869 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(2)
871 faggressive-loop-optimizations
872 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
873 Aggressively optimize loops using language constraints
876 Common Report Var(align_functions,0) Optimization UInteger
877 Align the start of functions
880 Common RejectNegative Joined UInteger Var(align_functions)
883 Common Report Var(align_jumps,0) Optimization UInteger
884 Align labels which are only reached by jumping
887 Common RejectNegative Joined UInteger Var(align_jumps)
890 Common Report Var(align_labels,0) Optimization UInteger
894 Common RejectNegative Joined UInteger Var(align_labels)
897 Common Report Var(align_loops,0) Optimization UInteger
898 Align the start of loops
901 Common RejectNegative Joined UInteger Var(align_loops)
905 Does nothing. Preserved for backward compatibility.
909 Does nothing. Preserved for backward compatibility.
911 fargument-noalias-global
913 Does nothing. Preserved for backward compatibility.
915 fargument-noalias-anything
917 Does nothing. Preserved for backward compatibility.
920 Common Report Var(flag_asan)
921 Enable AddressSanitizer, a memory error detector
924 Common Report Var(flag_tsan)
925 Enable ThreadSanitizer, a data race detector
927 fasynchronous-unwind-tables
928 Common Report Var(flag_asynchronous_unwind_tables) Optimization
929 Generate unwind tables that are exact at each instruction boundary
932 Common Report Var(flag_auto_inc_dec) Init(1)
933 Generate auto-inc/dec instructions
936 Common Report Var(flag_auto_profile) Optimization
937 Use sample profile information for call graph node weights. The default
938 profile file is fbdata.afdo in 'pwd'.
941 Common Joined RejectNegative Var(auto_profile_file)
942 Use sample profile information for call graph node weights. The profile
943 file is specified in the argument.
945 ; -fcheck-bounds causes gcc to generate array bounds checks.
946 ; For C, C++ and ObjC: defaults off.
947 ; For Java: defaults to on.
948 ; For Fortran: defaults to off.
950 Common Report Var(flag_bounds_check)
951 Generate code to check bounds before indexing arrays
954 Common Report Var(flag_branch_on_count_reg) Init(1) Optimization
955 Replace add, compare, branch with branch on count register
957 fbranch-probabilities
958 Common Report Var(flag_branch_probabilities) Optimization
959 Use profiling information for branch probabilities
961 fbranch-target-load-optimize
962 Common Report Var(flag_branch_target_load_optimize) Optimization
963 Perform branch target load optimization before prologue / epilogue threading
965 fbranch-target-load-optimize2
966 Common Report Var(flag_branch_target_load_optimize2) Optimization
967 Perform branch target load optimization after prologue / epilogue threading
970 Common Report Var(flag_btr_bb_exclusive) Optimization
971 Restrict target load migration not to re-use registers in any basic block
974 Common Joined RejectNegative Var(common_deferred_options) Defer
975 -fcall-saved-<register> Mark <register> as being preserved across functions
978 Common Joined RejectNegative Var(common_deferred_options) Defer
979 -fcall-used-<register> Mark <register> as being corrupted by function calls
981 ; Nonzero for -fcaller-saves: allocate values in regs that need to
982 ; be saved across function calls, if that produces overall better code.
983 ; Optional now, so people can test it.
985 Common Report Var(flag_caller_saves) Optimization
986 Save registers around function calls
989 Common Report Var(flag_check_data_deps)
990 Compare the results of several data dependence analyzers.
992 fcombine-stack-adjustments
993 Common Report Var(flag_combine_stack_adjustments) Optimization
994 Looks for opportunities to reduce stack adjustments and stack references.
997 Common Report Var(flag_no_common,0) Optimization
998 Do not put uninitialized globals in the common section
1002 ; Converted by the driver to -fcompare-debug= options.
1005 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
1006 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
1008 fcompare-debug-second
1009 Common Driver RejectNegative Var(flag_compare_debug)
1010 Run only the second compilation of -fcompare-debug
1013 Common Report Var(flag_compare_elim_after_reload) Optimization
1014 Perform comparison elimination after register allocation has finished
1017 Common Var(flag_conserve_stack) Optimization
1018 Do not perform optimizations increasing noticeably stack usage
1021 Common Report Var(flag_cprop_registers) Optimization
1022 Perform a register copy-propagation optimization pass
1025 Common Report Var(flag_crossjumping) Optimization
1026 Perform cross-jumping optimization
1029 Common Report Var(flag_cse_follow_jumps) Optimization
1030 When running CSE, follow jumps to their targets
1034 Does nothing. Preserved for backward compatibility.
1037 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
1038 Omit range reduction step when performing complex division
1041 Common Report Var(flag_cx_fortran_rules) Optimization
1042 Complex multiplication and division follow Fortran rules
1045 Common Report Var(flag_data_sections) Optimization
1046 Place data items into their own section
1049 Common Report Var(common_deferred_options) Defer
1050 List all available debugging counters with their limits and counts.
1053 Common RejectNegative Joined Var(common_deferred_options) Defer
1054 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
1057 Common Joined RejectNegative Var(common_deferred_options) Defer
1058 Map one directory name to another in debug information
1060 fdebug-types-section
1061 Common Report Var(flag_debug_types_section) Init(0)
1062 Output .debug_types section when using DWARF v4 debuginfo.
1064 ; Nonzero for -fdefer-pop: don't pop args after each function call
1065 ; instead save them up to pop many calls' args with one insns.
1067 Common Report Var(flag_defer_pop) Optimization
1068 Defer popping functions args from stack until later
1071 Common Report Var(flag_delayed_branch) Optimization
1072 Attempt to fill delay slots of branch instructions
1074 fdelete-dead-exceptions
1075 Common Report Var(flag_delete_dead_exceptions) Init(0)
1076 Delete dead instructions that may throw exceptions
1078 fdelete-null-pointer-checks
1079 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
1080 Delete useless null pointer checks
1083 Common Report Var(flag_devirtualize) Optimization
1084 Try to convert virtual calls to direct ones.
1086 fdiagnostics-show-location=
1087 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1088 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
1090 ; Required for these enum values.
1095 Name(diagnostic_prefixing_rule) Type(int)
1098 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1101 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1103 fdiagnostics-show-caret
1104 Common Var(flag_diagnostics_show_caret) Init(1)
1105 Show the source line with a caret indicating the column
1107 fdiagnostics-show-option
1108 Common Var(flag_diagnostics_show_option) Init(1)
1109 Amend appropriate diagnostic messages with the command line option that controls them
1112 Common Joined RejectNegative Var(common_deferred_options) Defer
1113 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1116 Common Joined RejectNegative Var(common_deferred_options) Defer
1117 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1120 Common Joined RejectNegative Var(common_deferred_options) Defer
1121 -fdump-<type> Dump various compiler internals to a file
1124 Driver RejectNegative
1127 Common RejectNegative Joined Var(flag_dump_final_insns)
1128 -fdump-final-insns=filename Dump to filename the insns at the end of translation
1131 Common RejectNegative Joined Var(flag_dump_go_spec)
1132 -fdump-go-spec=filename Write all declarations to file as Go code
1135 Common Report Var(flag_dump_noaddr)
1136 Suppress output of addresses in debugging dumps
1139 Common Var(flag_dump_passes) Init(0)
1140 Dump optimization passes
1143 Common Report Var(flag_dump_unnumbered)
1144 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1146 fdump-unnumbered-links
1147 Common Report Var(flag_dump_unnumbered_links)
1148 Suppress output of previous and next insn numbers in debugging dumps
1151 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1152 Enable CFI tables via GAS assembler directives.
1155 Common Report Var(flag_dyn_ipa)
1156 Perform Dynamic Inter-Procedural Analysis.
1159 Common Report Var(flag_dyn_ipa_allow_debug) Init(0)
1160 Allow -g enablement for -fripa -fprofile-generate compiles.
1162 fripa-disallow-asm-modules
1163 Common Report Var(flag_ripa_disallow_asm_modules)
1164 Don't import an auxiliary module if it contains asm statements
1166 fripa-disallow-opt-mismatch
1167 Common Report Var(flag_ripa_disallow_opt_mismatch)
1168 Don't import an auxiliary module if the command line options mismatch with the primary module
1170 fripa-no-promote-always-inline-func
1171 Common Report Var(flag_ripa_no_promote_always_inline) Init(0)
1172 Don't promote always inline static functions assuming they
1173 will be inlined and no copy is needed.
1176 Common Joined RejectNegative Var(lipo_inc_path_pattern)
1177 Substitute substring in include paths with a new string to allow reuse profile data
1180 Common Report Var(flag_early_inlining) Init(1) Optimization
1181 Perform early inlining
1183 feliminate-dwarf2-dups
1184 Common Report Var(flag_eliminate_dwarf2_dups)
1185 Perform DWARF2 duplicate elimination
1188 Common Report Var(flag_ipa_sra) Init(0) Optimization
1189 Perform interprocedural reduction of aggregates
1191 feliminate-unused-debug-symbols
1192 Common Report Var(flag_debug_only_used_symbols)
1193 Perform unused type elimination in debug info
1195 feliminate-unused-debug-types
1196 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1197 Perform unused type elimination in debug info
1199 femit-class-debug-always
1200 Common Report Var(flag_emit_class_debug_always) Init(0)
1201 Do not suppress C++ class debug information.
1204 Common Report Var(flag_exceptions) Optimization
1205 Enable exception handling
1207 fexpensive-optimizations
1208 Common Report Var(flag_expensive_optimizations) Optimization
1209 Perform a number of minor, expensive optimizations
1212 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1213 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1216 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1219 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1222 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1228 Common Var(flag_fat_lto_objects) Init(1)
1229 Output lto objects containing both the intermediate language and binary output.
1232 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1233 Assume no NaNs or infinities are generated
1236 Common Joined RejectNegative Var(common_deferred_options) Defer
1237 -ffixed-<register> Mark <register> as being unavailable to the compiler
1240 Common Report Var(flag_float_store) Optimization
1241 Don't allocate floats and doubles in extended-precision registers
1245 Does nothing. Preserved for backward compatibility.
1248 Common Report Var(flag_forward_propagate) Optimization
1249 Perform a forward propagation pass on RTL
1252 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1253 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1256 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1259 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1261 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1263 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1266 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1268 ffunction-attribute-list=
1269 Common Joined RejectNegative Var(common_deferred_options) Defer
1270 -ffunction-attribute-list=attribute:name,... Add attribute to named functions
1272 ; Nonzero means don't put addresses of constant functions in registers.
1273 ; Used for compiling the Unix kernel, where strange substitutions are
1274 ; done on the assembly output.
1276 Common Report Var(flag_no_function_cse,0)
1277 Allow function addresses to be held in registers
1280 Common Report Var(flag_function_sections)
1281 Place each function into its own section
1284 Common Report Var(flag_gcse) Optimization
1285 Perform global common subexpression elimination
1288 Common Report Var(flag_gcse_lm) Init(1) Optimization
1289 Perform enhanced load motion during global common subexpression elimination
1292 Common Report Var(flag_gcse_sm) Init(0) Optimization
1293 Perform store motion after global common subexpression elimination
1296 Common Report Var(flag_gcse_las) Init(0) Optimization
1297 Perform redundant load after store elimination in global common subexpression
1301 Common Report Var(flag_gcse_after_reload) Optimization
1302 Perform global common subexpression elimination after register allocation
1305 ; This option is not documented yet as its semantics will change.
1307 Common Report Var(flag_graphite)
1308 Enable in and out of Graphite representation
1311 Common Report Var(flag_graphite_identity) Optimization
1312 Enable Graphite Identity transformation
1314 fhoist-adjacent-loads
1315 Common Report Var(flag_hoist_adjacent_loads) Optimization
1316 Enable hoisting adjacent loads to encourage generating conditional move
1319 floop-parallelize-all
1320 Common Report Var(flag_loop_parallelize_all) Optimization
1321 Mark all loops as parallel
1324 Common Report Var(flag_loop_strip_mine) Optimization
1325 Enable Loop Strip Mining transformation
1328 Common Report Var(flag_loop_interchange) Optimization
1329 Enable Loop Interchange transformation
1332 Common Report Var(flag_loop_block) Optimization
1333 Enable Loop Blocking transformation
1336 Common Report Var(flag_tm)
1337 Enable support for GNU transactional memory
1341 Does nothing. Preserved for backward compatibility.
1344 Common Report Var(flag_loop_optimize_isl) Optimization
1345 Enable the ISL based loop nest optimizer
1347 fstrict-volatile-bitfields
1348 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1349 Force bitfield accesses to match their type width
1351 fguess-branch-probability
1352 Common Report Var(flag_guess_branch_prob) Optimization
1353 Enable guessing of branch probabilities
1355 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1356 ; Generate position-independent code for executables if possible
1357 ; On SVR4 targets, it also controls whether or not to emit a
1358 ; string identifying the compiler.
1360 Common Report Var(flag_no_ident,0)
1361 Process #ident directives
1364 Common Report Var(flag_if_conversion) Optimization
1365 Perform conversion of conditional jumps to branchless equivalents
1368 Common Report Var(flag_if_conversion2) Optimization
1369 Perform conversion of conditional jumps to conditional execution
1372 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1373 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1376 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1379 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1382 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1385 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1387 ftree-loop-if-convert
1388 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1389 Convert conditional jumps in innermost loops to branchless equivalents
1391 ftree-loop-if-convert-stores
1392 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1393 Also if-convert conditional jumps containing memory writes
1395 ; -finhibit-size-directive inhibits output of .size for ELF.
1396 ; This is used only for compiling crtstuff.c,
1397 ; and it may be extended to other effects
1398 ; needed for crtstuff.c on other systems.
1399 finhibit-size-directive
1400 Common Report Var(flag_inhibit_size_directive)
1401 Do not generate .size directives
1404 Common Report Var(flag_indirect_inlining)
1405 Perform indirect inlining
1407 ; General flag to enable inlining. Specifying -fno-inline will disable
1408 ; all inlining apart from always-inline functions.
1410 Common Report Var(flag_no_inline,0) Init(0) Optimization
1411 Enable inlining of function declared \"inline\", disabling disables all inlining
1413 finline-small-functions
1414 Common Report Var(flag_inline_small_functions) Optimization
1415 Integrate functions into their callers when code size is known not to grow
1418 Common Report Var(flag_inline_functions) Optimization
1419 Integrate functions not declared \"inline\" into their callers when profitable
1421 finline-functions-called-once
1422 Common Report Var(flag_inline_functions_called_once) Optimization
1423 Integrate functions only required by their single caller
1426 Common RejectNegative Joined Alias(finline-limit=)
1429 Common RejectNegative Joined UInteger
1430 -finline-limit=<number> Limit the size of inlined functions to <number>
1433 Common Report Var(flag_inline_atomics) Init(1) Optimization
1434 Inline __atomic operations when a lock free instruction sequence is available.
1436 finstrument-functions
1437 Common Report Var(flag_instrument_function_entry_exit)
1438 Instrument function entry and exit with profiling calls
1440 finstrument-functions-exclude-function-list=
1441 Common RejectNegative Joined
1442 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1444 finstrument-functions-exclude-file-list=
1445 Common RejectNegative Joined
1446 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1449 Common Report Var(flag_ipa_cp) Optimization
1450 Perform Interprocedural constant propagation
1453 Common Report Var(flag_ipa_cp_clone) Optimization
1454 Perform cloning to make Interprocedural constant propagation stronger
1457 Common Report Var(flag_ipa_profile) Init(0) Optimization
1458 Perform interprocedural profile propagation
1461 Common Report Var(flag_ipa_pta) Init(0) Optimization
1462 Perform interprocedural points-to analysis
1465 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1466 Discover pure and const functions
1469 Common Report Var(flag_ipa_reference) Init(0) Optimization
1470 Discover readonly and non addressable static variables
1474 Does nothing. Preserved for backward compatibility.
1478 Does nothing. Preserved for backward compatibility.
1481 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1482 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1485 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1488 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1491 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1494 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1495 -fira-region=[one|all|mixed] Set regions for IRA
1498 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1501 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1504 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1507 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1510 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1511 Use IRA based register pressure calculation
1512 in RTL hoist optimizations.
1515 Common Report Var(flag_ira_loop_pressure)
1516 Use IRA based register pressure calculation
1517 in RTL loop optimizations.
1519 fira-share-save-slots
1520 Common Report Var(flag_ira_share_save_slots) Init(1)
1521 Share slots for saving different hard registers.
1523 fira-share-spill-slots
1524 Common Report Var(flag_ira_share_spill_slots) Init(1)
1525 Share stack slots for spilled pseudo-registers.
1528 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1529 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1532 Common Report Var(flag_ivopts) Init(1) Optimization
1533 Optimize induction variables on trees
1536 Common Var(flag_jump_tables) Init(1) Optimization
1537 Use jump tables for sufficiently large switch statements
1539 fkeep-inline-functions
1540 Common Report Var(flag_keep_inline_functions)
1541 Generate code for functions even if they are fully inlined
1544 Common Report Var(flag_keep_static_consts) Init(1)
1545 Emit static const variables even if they are not used
1548 Common Report Var(flag_leading_underscore) Init(-1)
1549 Give external symbols a leading underscore
1553 Does nothing. Preserved for backward compatibility.
1557 Enable link-time optimization.
1560 Common RejectNegative Joined Var(flag_lto)
1561 Link-time optimization with number of parallel jobs or jobserver.
1564 Common Var(flag_lto_partition_1to1)
1565 Partition symbols and vars at linktime based on object files they originate from
1567 flto-partition=balanced
1568 Common Var(flag_lto_partition_balanced)
1569 Partition functions and vars at linktime into approximately same sized buckets
1572 Common Var(flag_lto_partition_max)
1573 Put every symbol into separate partition
1576 Common Var(flag_lto_partition_none)
1577 Disable partioning and streaming
1579 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1580 flto-compression-level=
1581 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1582 -flto-compression-level=<number> Use zlib compression level <number> for IL
1585 Common Report Var(flag_lto_report) Init(0)
1586 Report various link-time optimization statistics
1589 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1590 Set errno after built-in math functions
1593 Common Joined RejectNegative UInteger Var(flag_max_errors)
1594 -fmax-errors=<number> Maximum number of errors to report
1597 Common Report Var(mem_report)
1598 Report on permanent memory allocation
1601 Common Report Var(mem_report_wpa)
1602 Report on permanent memory allocation in WPA only
1604 ; This will attempt to merge constant section constants, if 1 only
1605 ; string constants and constants from constant pool, if 2 also constant
1607 fmerge-all-constants
1608 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1609 Attempt to merge identical constants and constant variables
1612 Common Report Var(flag_merge_constants,1) Optimization
1613 Attempt to merge identical constants across compilation units
1615 fmerge-debug-strings
1616 Common Report Var(flag_merge_debug_strings) Init(1)
1617 Attempt to merge identical debug strings across compilation units
1620 Common RejectNegative Joined UInteger
1621 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1624 Common Report Var(flag_modulo_sched) Optimization
1625 Perform SMS based modulo scheduling before the first scheduling pass
1627 fmodulo-sched-allow-regmoves
1628 Common Report Var(flag_modulo_sched_allow_regmoves)
1629 Perform SMS based modulo scheduling with register moves allowed
1631 fmove-loop-invariants
1632 Common Report Var(flag_move_loop_invariants) Init(1) Optimization
1633 Move loop invariant computations out of loops
1636 Common Var(flag_dce) Init(1) Optimization
1637 Use the RTL dead code elimination pass
1640 Common Var(flag_dse) Init(1) Optimization
1641 Use the RTL dead store elimination pass
1643 freschedule-modulo-scheduled-loops
1644 Common Report Var(flag_resched_modulo_sched) Optimization
1645 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1647 fnon-call-exceptions
1648 Common Report Var(flag_non_call_exceptions) Optimization
1649 Support synchronous non-call exceptions
1652 Common Report Var(flag_omit_frame_pointer) Optimization
1653 When possible do not generate stack frames
1656 Common Report Var(flag_opt_info) Optimization
1657 Enable all optimization info dumps on stderr
1660 Common Joined RejectNegative Var(common_deferred_options) Defer
1661 -fopt-info[-<type>=filename] Dump compiler optimization details
1663 foptimize-register-move
1664 Common Report Var(flag_regmove) Optimization
1665 Do the full register move optimization pass
1667 foptimize-sibling-calls
1668 Common Report Var(flag_optimize_sibling_calls) Optimization
1669 Optimize sibling and tail recursive calls
1672 Common Report Var(flag_partial_inlining)
1673 Perform partial inlining
1676 Common Report Var(pre_ipa_mem_report)
1677 Report on memory allocation before interprocedural optimization
1679 fpost-ipa-mem-report
1680 Common Report Var(post_ipa_mem_report)
1681 Report on memory allocation before interprocedural optimization
1684 Common Report Var(flag_pack_struct) Optimization
1685 Pack structure members together without holes
1688 Common RejectNegative Joined UInteger Optimization
1689 -fpack-struct=<number> Set initial maximum structure member alignment
1692 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1693 Return small aggregates in memory, not registers
1695 fpeel-codesize-limit
1696 Common Report Var(flag_peel_codesize_limit) Init(1) Optimization
1697 Limit non-const non-FP loop peeling under profile estimates of large code footprint
1700 Common Report Var(flag_peel_loops) Optimization
1701 Perform loop peeling
1704 Common Report Var(flag_no_peephole,0) Optimization
1705 Enable machine specific peephole optimizations
1708 Common Report Var(flag_peephole2) Optimization
1709 Enable an RTL peephole pass before sched2
1712 Common Report Var(flag_pic,2) Negative(fPIE)
1713 Generate position-independent code if possible (large mode)
1716 Common Report Var(flag_pie,2) Negative(fpic)
1717 Generate position-independent code for executables if possible (large mode)
1720 Common Report Var(flag_pic,1) Negative(fpie)
1721 Generate position-independent code if possible (small mode)
1724 Common Report Var(flag_pie,1) Negative(fPIC)
1725 Generate position-independent code for executables if possible (small mode)
1728 Common Joined RejectNegative Var(common_deferred_options) Defer
1729 Specify a plugin to load
1732 Common Joined RejectNegative Var(common_deferred_options) Defer
1733 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1735 fpredictive-commoning
1736 Common Report Var(flag_predictive_commoning) Optimization
1737 Run predictive commoning optimization.
1739 fprefetch-loop-arrays
1740 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1741 Generate prefetch instructions, if available, for arrays in loops
1744 Common Report Var(profile_flag)
1745 Enable basic program profiling code
1748 Common Report Var(profile_arc_flag)
1749 Insert arc-based program profiling code
1752 Common Joined RejectNegative Var(profile_data_prefix)
1753 Set the top-level directory for storing the profile data.
1754 The default is 'pwd'.
1757 Common Report Var(flag_profile_correction)
1758 Enable correction of flow inconsistent profile data input
1761 Common Report Var(flag_profile_dump) Init(0) Optimization
1762 Dump CFG profile for comparison.
1764 ; fprofile-generate-atomic=0: disable aotimically update.
1765 ; fprofile-generate-atomic=1: aotimically update edge profile counters.
1766 ; fprofile-generate-atomic=2: aotimically update value profile counters.
1767 ; fprofile-generate-atomic=3: aotimically update edge and value profile counters.
1768 ; other values will be ignored (fall back to the default of 0).
1769 fprofile-generate-atomic=
1770 Common Joined UInteger Report Var(flag_profile_gen_atomic) Init(0) Optimization
1771 fprofile-generate-atomic=[0..3] Atomically increments for profile counters.
1775 Enable common options for generating profile info for profile feedback directed optimizations
1778 Common Joined RejectNegative
1779 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1781 fprofile-generate-sampling
1782 Common Var(flag_profile_generate_sampling)
1783 Turn on instrumentation sampling with -fprofile-generate with rate set by --param profile-generate-sampling-rate or environment variable GCOV_SAMPLING_RATE
1786 Common Joined RejectNegative Var(profile_base_name_suffix_to_strip)
1787 Specify a substring to be stripped from the profile base file name
1790 Common Var(flag_profile_use)
1791 Enable common options for performing profile feedback directed optimizations
1794 Common Joined RejectNegative
1795 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1798 Common Report Var(flag_profile_values)
1799 Insert code to profile values of expressions
1802 Common Report Var(profile_report)
1803 Report on consistency of profile
1806 Common Var(common_deferred_options) Defer
1809 Common Joined RejectNegative Var(common_deferred_options) Defer
1810 -frandom-seed=<string> Make compile reproducible using <string>
1812 ; This switch causes the command line that was used to create an
1813 ; object file to be recorded into the object file. The exact format
1814 ; of this recording is target and binary file format dependent.
1815 ; It is related to the -fverbose-asm switch, but that switch only
1816 ; records information in the assembler output file as comments, so
1817 ; they never reach the object file.
1818 frecord-gcc-switches
1819 Common Report Var(flag_record_gcc_switches)
1820 Record gcc command line switches in the object file.
1822 ; This option differs from frecord-gcc-switches in the way that it
1823 ; divide the command line options into several categories. And the
1824 ; section is not mergable so that linker can save gcc switches for
1826 frecord-compilation-info-in-elf
1827 Common Report Var(flag_record_compilation_info_in_elf)
1828 Record the compiler optimizations in a .gnu.switches.text section.
1831 Common Report Var(flag_pcc_struct_return,0) Optimization
1832 Return small aggregates in registers
1835 Common Report Var(flag_regmove) Optimization
1836 Enables a register move optimization
1839 Common Report Var(flag_rename_registers) Init(2) Optimization
1840 Perform a register renaming optimization pass
1843 Common Report Var(flag_reorder_blocks) Optimization
1844 Reorder basic blocks to improve code placement
1846 freorder-blocks-and-partition
1847 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1848 Reorder basic blocks and partition into hot and cold sections
1851 Common Report Var(flag_reorder_functions) Optimization
1852 Reorder functions to improve code placement
1855 Common Joined RejectNegative Enum(function_reorder) Var(flag_reorder_functions) Init(0) Optimization
1856 -freorder-functions=[callgraph] Select the scheme for function reordering. This invokes a linker plugin. Generate .gnu.callgraph.text sections listing callees and edge counts.
1859 Name(function_reorder) Type(int) UnknownError(unrecognized function reorder value %qs)
1862 Enum(function_reorder) String(callgraph) Value(2)
1864 frerun-cse-after-loop
1865 Common Report Var(flag_rerun_cse_after_loop) Optimization
1866 Add a common subexpression elimination pass after loop optimizations
1870 Does nothing. Preserved for backward compatibility.
1873 Common Report Var(flag_rounding_math) Optimization SetByCombined
1874 Disable optimizations that assume default FP rounding behavior
1877 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1878 Enable scheduling across basic blocks
1881 Common Report Var(flag_sched_pressure) Init(0) Optimization
1882 Enable register pressure sensitive insn scheduling
1885 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1886 Allow speculative motion of non-loads
1889 Common Report Var(flag_schedule_speculative_load) Optimization
1890 Allow speculative motion of some loads
1892 fsched-spec-load-dangerous
1893 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1894 Allow speculative motion of more loads
1897 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1898 -fsched-verbose=<number> Set the verbosity level of the scheduler
1900 fsched2-use-superblocks
1901 Common Report Var(flag_sched2_use_superblocks) Optimization
1902 If scheduling post reload, do superblock scheduling
1906 Does nothing. Preserved for backward compatibility.
1909 Common Report Var(flag_schedule_insns) Optimization
1910 Reschedule instructions before register allocation
1913 Common Report Var(flag_schedule_insns_after_reload) Optimization
1914 Reschedule instructions after register allocation
1916 ; This flag should be on when a target implements non-trivial
1917 ; scheduling hooks, maybe saving some information for its own sake.
1918 ; On IA64, for example, this is used for correct bundling.
1919 fselective-scheduling
1920 Common Report Var(flag_selective_scheduling) Optimization
1921 Schedule instructions using selective scheduling algorithm
1923 fselective-scheduling2
1924 Common Report Var(flag_selective_scheduling2) Optimization
1925 Run selective scheduling after reload
1927 fsel-sched-pipelining
1928 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1929 Perform software pipelining of inner loops during selective scheduling
1931 fsel-sched-pipelining-outer-loops
1932 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1933 Perform software pipelining of outer loops during selective scheduling
1935 fsel-sched-reschedule-pipelined
1936 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1937 Reschedule pipelined regions without pipelining
1939 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1940 ; of stalled insns into the ready list.
1941 fsched-stalled-insns
1942 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1943 Allow premature scheduling of queued insns
1945 fsched-stalled-insns=
1946 Common RejectNegative Joined UInteger
1947 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1949 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1950 ; be examined for a dependency on a stalled insn that is candidate for
1951 ; premature removal from the queue of stalled insns into the ready list (has
1952 ; an effect only if the flag 'sched_stalled_insns' is set).
1953 fsched-stalled-insns-dep
1954 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1955 Set dependence distance checking in premature scheduling of queued insns
1957 fsched-stalled-insns-dep=
1958 Common RejectNegative Joined UInteger
1959 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1961 fsched-group-heuristic
1962 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1963 Enable the group heuristic in the scheduler
1965 fsched-critical-path-heuristic
1966 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1967 Enable the critical path heuristic in the scheduler
1969 fsched-spec-insn-heuristic
1970 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1971 Enable the speculative instruction heuristic in the scheduler
1973 fsched-rank-heuristic
1974 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1975 Enable the rank heuristic in the scheduler
1977 fsched-last-insn-heuristic
1978 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1979 Enable the last instruction heuristic in the scheduler
1981 fsched-dep-count-heuristic
1982 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1983 Enable the dependent count heuristic in the scheduler
1986 Common Report Var(flag_section_anchors) Optimization
1987 Access data in the same section from shared anchor points
1991 Does nothing. Preserved for backward compatibility.
1995 Does nothing. Preserved for backward compatibility.
1998 Common Report Var(flag_ree) Init(0)
1999 Turn on Redundant Extensions Elimination pass.
2002 Common Report Var(flag_show_column) Init(1)
2003 Show column numbers in diagnostics, when available. Default on
2006 Common Report Var(flag_shrink_wrap) Optimization
2007 Emit function prologues only before parts of the function that need it,
2008 rather than at the top of the function.
2011 Common Report Var(flag_signaling_nans) Optimization SetByCombined
2012 Disable optimizations observable by IEEE signaling NaNs
2015 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
2016 Disable floating point optimizations that ignore the IEEE signedness of zero
2018 fsingle-precision-constant
2019 Common Report Var(flag_single_precision_constant) Optimization
2020 Convert floating point constants to single precision constants
2023 Common Report Var(flag_sized_delete) Optimization
2024 Support delete operator with objetc's size as the second parameter.
2026 fsplit-ivs-in-unroller
2027 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
2028 Split lifetimes of induction variables when loops are unrolled
2031 Common Report Var(flag_split_stack) Init(-1)
2032 Generate discontiguous stack frames
2035 Common Report Var(flag_split_wide_types) Optimization
2036 Split wide types into independent registers
2038 fvariable-expansion-in-unroller
2039 Common Report Var(flag_variable_expansion_in_unroller) Optimization
2040 Apply variable expansion when loops are unrolled
2043 Common Report RejectNegative Joined
2044 -fstack-check=[no|generic|specific] Insert stack checking code into the program
2047 Common Alias(fstack-check=, specific, no)
2048 Insert stack checking code into the program. Same as -fstack-check=specific
2051 Common Var(common_deferred_options) Defer
2053 fstack-limit-register=
2054 Common RejectNegative Joined Var(common_deferred_options) Defer
2055 -fstack-limit-register=<register> Trap if the stack goes past <register>
2057 fstack-limit-symbol=
2058 Common RejectNegative Joined Var(common_deferred_options) Defer
2059 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
2062 Common Report Var(flag_stack_protect, 1)
2063 Use propolice as a stack protection method
2065 fstack-protector-strong
2066 Common Report RejectNegative Var(flag_stack_protect, 2)
2067 Use a smart stack protection method for certain functions
2069 fstack-protector-all
2070 Common Report RejectNegative Var(flag_stack_protect, 3)
2071 Use a stack protection method for every function
2074 Common RejectNegative Var(flag_stack_usage)
2075 Output stack usage information on a per-function basis
2079 Does nothing. Preserved for backward compatibility.
2081 ; Nonzero if we should do (language-dependent) alias analysis.
2082 ; Typically, this analysis will assume that expressions of certain
2083 ; types do not alias expressions of certain other types. Only used
2084 ; if alias analysis (in general) is enabled.
2086 Common Report Var(flag_strict_aliasing) Optimization
2087 Assume strict aliasing rules apply
2090 Common Report Var(flag_strict_overflow)
2091 Treat signed overflow as undefined
2094 Common Report Var(flag_sync_libcalls) Init(1)
2095 Implement __atomic operations via libcalls to legacy __sync functions
2098 Common Report Var(flag_syntax_only)
2099 Check for syntax errors, then stop
2102 Common Report Var(flag_test_coverage)
2103 Create data files needed by \"gcov\"
2106 Common Report Var(flag_thread_jumps) Optimization
2107 Perform jump threading optimizations
2110 Common Report Var(time_report)
2111 Report the time taken by each compiler pass
2114 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2115 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
2118 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2121 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2124 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2127 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2130 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2133 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
2134 Reorder top level functions, variables, and asms
2137 Common Report Var(flag_tracer)
2138 Perform superblock formation via tail duplication
2140 ; Zero means that floating-point math operations cannot generate a
2141 ; (user-visible) trap. This is the case, for example, in nonstop
2142 ; IEEE 754 arithmetic.
2144 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2145 Assume floating-point operations can trap
2148 Common Report Var(flag_trapv) Optimization
2149 Trap for signed overflow in addition, subtraction and multiplication
2152 Common Report Var(flag_tree_ccp) Optimization
2153 Enable SSA-CCP optimization on trees
2156 Common Report Var(flag_tree_bit_ccp) Optimization
2157 Enable SSA-BIT-CCP optimization on trees
2161 Does nothing. Preserved for backward compatibility.
2164 Common Report Var(flag_tree_ch) Optimization
2165 Enable loop header copying on trees
2167 ftree-coalesce-inlined-vars
2168 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2169 Enable coalescing of copy-related user variables that are inlined
2172 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2173 Enable coalescing of all copy-related user variables
2176 Common Report Var(flag_tree_copyrename) Optimization
2177 Replace SSA temporaries with better names in copies
2180 Common Report Var(flag_tree_copy_prop) Optimization
2181 Enable copy propagation on trees
2183 ftree-store-copy-prop
2185 Does nothing. Preserved for backward compatibility.
2188 Common Report Var(flag_tree_cselim) Init(2) Optimization
2189 Transform condition stores into unconditional ones
2191 ftree-switch-conversion
2192 Common Report Var(flag_tree_switch_conversion) Optimization
2193 Perform conversions of switch initializations.
2196 Common Report Var(flag_tree_dce) Optimization
2197 Enable SSA dead code elimination optimization on trees
2199 ftree-dominator-opts
2200 Common Report Var(flag_tree_dom) Optimization
2201 Enable dominator optimizations
2204 Common Report Var(flag_tree_tail_merge) Optimization
2205 Enable tail merging on trees
2208 Common Report Var(flag_tree_dse) Optimization
2209 Enable dead store elimination
2212 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2213 Enable forward propagation on trees
2216 Common Report Var(flag_tree_fre) Optimization
2217 Enable Full Redundancy Elimination (FRE) on trees
2220 Common Report Var(flag_optimize_strlen) Optimization
2221 Enable string length optimizations on trees
2223 ftree-loop-distribution
2224 Common Report Var(flag_tree_loop_distribution) Optimization
2225 Enable loop distribution on trees
2227 ftree-loop-distribute-patterns
2228 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2229 Enable loop distribution for patterns transformed into a library call
2232 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2233 Enable loop invariant motion on trees
2236 Common Alias(floop-interchange)
2237 Enable loop interchange transforms. Same as -floop-interchange
2240 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2241 Create canonical induction variables in loops
2244 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2245 Enable loop optimizations on tree level
2247 ftree-parallelize-loops=
2248 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2249 Enable automatic parallelization of loops
2252 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2253 Enable hoisting loads from conditional pointers.
2256 Common Report Var(flag_tree_pre) Optimization
2257 Enable SSA-PRE optimization on trees
2260 Common Report Var(flag_tree_partial_pre) Optimization
2261 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2264 Common Report Var(flag_tree_pta) Init(1) Optimization
2265 Perform function-local points-to analysis on trees.
2268 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2269 Enable reassociation on tree level
2273 Does nothing. Preserved for backward compatibility.
2276 Common Report Var(flag_tree_sink) Optimization
2277 Enable SSA code sinking on trees
2280 Common Report Var(flag_tree_slsr) Optimization
2281 Perform straight-line strength reduction
2284 Common Report Var(flag_tree_sra) Optimization
2285 Perform scalar replacement of aggregates
2288 Common Report Var(flag_tree_ter) Optimization
2289 Replace temporary expressions in the SSA->normal pass
2292 Common Report Var(flag_tree_live_range_split) Optimization
2293 Perform live range splitting during the SSA->normal pass
2296 Common Report Var(flag_tree_vrp) Init(0) Optimization
2297 Perform Value Range Propagation on trees
2299 fstrict-enum-precision
2300 Common Report Var(flag_strict_enum_precision) Init(1) Optimization
2301 Perform transformations based on enum precision
2304 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2305 Compile whole compilation unit at a time
2308 Common Report Var(flag_unroll_loops) Optimization
2309 Perform loop unrolling when iteration count is known
2312 Common Report Var(flag_unroll_all_loops) Optimization
2313 Perform loop unrolling for all loops
2315 funroll-codesize-limit
2316 Common Report Var(flag_unroll_codesize_limit) Init(1) Optimization
2317 Limit non-const non-FP loop unrolling under profile estimates of large code footprint
2319 ; Nonzero means that loop optimizer may assume that the induction variables
2320 ; that control loops do not overflow and that the loops with nontrivial
2321 ; exit condition are not infinite
2322 funsafe-loop-optimizations
2323 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2324 Allow loop optimizations to assume that the loops behave in normal way
2327 Common Report Var(flag_associative_math) SetByCombined
2328 Allow optimization for floating-point arithmetic which may change the
2329 result of the operation due to rounding.
2332 Common Report Var(flag_reciprocal_math) SetByCombined
2333 Same as -fassociative-math for expressions which include division.
2335 ; Nonzero means that unsafe floating-point math optimizations are allowed
2336 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2337 ; are allowed to assume that their arguments and results are "normal"
2338 ; (e.g., nonnegative for SQRT).
2339 funsafe-math-optimizations
2340 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2341 Allow math optimizations that may violate IEEE or ISO standards
2344 Common Report Var(flag_unswitch_loops) Optimization
2345 Perform loop unswitching
2348 Common Report Var(flag_unwind_tables) Optimization
2349 Just generate unwind tables for exception handling
2352 Common Negative(fuse-ld=gold)
2353 Use the bfd linker instead of the default linker
2356 Common Negative(fuse-ld=bfd)
2357 Use the gold linker instead of the default linker
2362 ; Positive if we should track variables, negative if we should run
2363 ; the var-tracking pass only to discard debug annotations, zero if
2364 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2365 ; will be set according to optimize, debug_info_level and debug_hooks
2366 ; in process_options ().
2368 Common Report Var(flag_var_tracking) Init(2) Optimization
2369 Perform variable tracking
2371 ; Positive if we should track variables at assignments, negative if
2372 ; we should run the var-tracking pass only to discard debug
2373 ; annotations. When flag_var_tracking_assignments ==
2374 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2375 fvar-tracking-assignments
2376 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2377 Perform variable tracking by annotating assignments
2379 ; Nonzero if we should toggle flag_var_tracking_assignments after
2380 ; processing options and computing its default. */
2381 fvar-tracking-assignments-toggle
2382 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2383 Toggle -fvar-tracking-assignments
2385 ; Positive if we should track uninitialized variables, negative if
2386 ; we should run the var-tracking pass only to discard debug
2387 ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
2388 ; will be set according to flag_var_tracking.
2389 fvar-tracking-uninit
2390 Common Report Var(flag_var_tracking_uninit) Optimization
2391 Perform variable tracking and also tag variables that are uninitialized
2394 Common Report Var(flag_tree_vectorize) Optimization
2395 Enable vectorization on trees
2397 ftree-vectorizer-verbose=
2398 Common RejectNegative Joined UInteger Var(common_deferred_options) Defer
2399 -ftree-vectorizer-verbose=<number> This switch is deprecated. Use -fopt-info instead.
2401 ftree-loop-vectorize
2402 Common Report Var(flag_tree_loop_vectorize) Optimization
2403 Enable loop vectorization on trees
2406 Common Report Var(flag_tree_slp_vectorize) Optimization
2407 Enable basic block vectorization (SLP) on trees
2410 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT)
2411 Specifies the cost model for vectorization
2414 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2417 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2420 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2423 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2426 Common RejectNegative Alias(fvect-cost-model=,dynamic)
2427 Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
2430 Common RejectNegative Alias(fvect-cost-model=,unlimited)
2431 Enables the unlimited vectorizer cost model. Preserved for backward compatibility.
2433 ftree-vect-loop-version
2435 Does nothing. Preserved for backward compatibility.
2438 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2439 Enable copy propagation of scalar-evolution information.
2441 ; -fverbose-asm causes extra commentary information to be produced in
2442 ; the generated assembly code (to make it more readable). This option
2443 ; is generally only of use to those who actually need to read the
2444 ; generated assembly code (perhaps while debugging the compiler itself).
2445 ; -fno-verbose-asm, the default, causes the extra information
2446 ; to not be added and is useful when comparing two assembler files.
2448 Common Report Var(flag_verbose_asm)
2449 Add extra commentary to assembler output
2452 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2453 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2456 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2459 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2462 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2465 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2468 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2471 Common Report Var(flag_value_profile_transformations) Optimization
2472 Use expression value profiles in optimizations
2475 Common Report Var(flag_web) Init(2) Optimization
2476 Construct webs and split unrelated uses of single variable
2478 ftree-builtin-call-dce
2479 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2480 Enable conditional dead code elimination for builtin calls
2483 Common Report Var(flag_whole_program) Init(0) Optimization
2484 Perform whole program optimizations
2487 Common Report Var(flag_wrapv) Optimization
2488 Assume signed arithmetic overflow wraps around
2490 fzero-initialized-in-bss
2491 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2492 Put zero initialized data in the bss section
2495 Common JoinedOrMissing
2496 Generate debug information in default format
2499 Common JoinedOrMissing Negative(gdwarf-)
2500 Generate debug information in COFF format
2503 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2504 Generate debug information in DWARF v2 (or later) format
2507 Common JoinedOrMissing
2508 Generate debug information in default extended format
2511 Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2512 Don't generate DWARF pubnames and pubtypes sections.
2515 Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2516 Generate DWARF pubnames and pubtypes sections.
2519 Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2520 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2522 gno-record-gcc-switches
2523 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2524 Don't record gcc command line switches in DWARF DW_AT_producer.
2526 grecord-gcc-switches
2527 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2528 Record gcc command line switches in DWARF DW_AT_producer.
2531 Common RejectNegative
2532 Generate debug information at level 1 with minimal line table
2535 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2536 Don't generate debug information in separate .dwo files
2539 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2540 Generate debug information in separate .dwo files
2543 Common Driver Alias(gsplit-dwarf)
2546 Common Driver Alias(gno-split-dwarf)
2549 Common JoinedOrMissing Negative(gstabs+)
2550 Generate debug information in STABS format
2553 Common JoinedOrMissing Negative(gvms)
2554 Generate debug information in extended STABS format
2557 Common RejectNegative Var(dwarf_strict,0) Init(0)
2558 Emit DWARF additions beyond selected version
2561 Common Report RejectNegative Var(dwarf_strict,1)
2562 Don't emit DWARF additions beyond selected version
2565 Common Report Var(flag_gtoggle)
2566 Toggle debug information generation
2569 Common JoinedOrMissing Negative(gxcoff)
2570 Generate debug information in VMS format
2573 Common JoinedOrMissing Negative(gxcoff+)
2574 Generate debug information in XCOFF format
2577 Common JoinedOrMissing Negative(gcoff)
2578 Generate debug information in extended XCOFF format
2581 Driver Joined Separate
2584 Common Joined Var(plugindir_string) Init(0)
2585 -iplugindir=<dir> Set <dir> to be the default plugin directory
2588 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2589 -imultiarch <dir> Set <dir> to be the multiarch include subdirectory
2592 Driver Joined Separate
2597 no-canonical-prefixes
2613 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2614 -o <file> Place output into <file>
2617 Common Var(profile_flag)
2618 Enable function profiling
2621 Driver Var(pass_exit_codes)
2624 Common Alias(Wpedantic)
2627 Common Var(flag_pedantic_errors)
2628 Like -pedantic but issue them as errors
2634 Driver Var(use_pipes)
2637 Driver JoinedOrMissing Var(print_file_name)
2639 print-libgcc-file-name
2642 print-multi-directory
2643 Driver Var(print_multi_directory)
2646 Driver Var(print_multi_lib)
2648 print-multi-os-directory
2649 Driver Var(print_multi_os_directory)
2652 Driver Var(print_multiarch)
2655 Driver JoinedOrMissing Var(print_prog_name)
2658 Driver Var(print_search_dirs)
2661 Driver Var(print_sysroot)
2663 print-sysroot-headers-suffix
2664 Driver Var(print_sysroot_headers_suffix)
2667 Common Var(quiet_flag) RejectDriver
2668 Do not display functions compiled or elapsed time
2686 Driver Var(report_times)
2689 Driver JoinedOrMissing
2692 Driver Joined Separate
2696 ; C option, but driver must not handle as "-u ndef".
2699 Common Driver Var(verbose_flag)
2700 Enable verbose output
2703 Common Var(version_flag) RejectDriver
2704 Display the compiler's version
2707 Common Var(inhibit_warnings)
2711 Driver Separate Var(wrapper_string)
2714 Driver Joined Separate
2717 Driver RejectNegative Negative(pie)
2718 Create a shared library
2724 Driver Separate Alias(specs=)
2737 ; Documented for Fortran, but always accepted by driver.
2744 ; Documented for Go, but always accepted by driver.
2756 Driver RejectNegative Negative(shared)
2757 Create a position independent executable
2760 Driver Joined Separate
2762 ; This comment is to ensure we retain the blank line above.