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_overflow) Init(1) Warning
592 Warn about overflow in arithmetic expressions
595 Common Var(warn_packed) Warning
596 Warn when the packed attribute has no effect on struct layout
599 Common Var(warn_padded) Warning
600 Warn when padding is required to align structure members
603 Common Var(pedantic) Warning
604 Issue warnings needed for strict compliance to the standard
607 Common Var(warn_shadow) Warning
608 Warn when one local variable shadows another
611 Common Var(warn_stack_protect) Warning
612 Warn when not issuing stack smashing protection for some reason
615 Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
616 Warn if stack usage might be larger than specified amount
620 Warn about code which might break strict aliasing rules
623 Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
624 Warn about code which might break strict aliasing rules
628 Warn about optimizations that assume that signed overflow is undefined
631 Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
632 Warn about optimizations that assume that signed overflow is undefined
634 Wsuggest-attribute=const
635 Common Var(warn_suggest_attribute_const) Warning
636 Warn about functions which might be candidates for __attribute__((const))
638 Wsuggest-attribute=pure
639 Common Var(warn_suggest_attribute_pure) Warning
640 Warn about functions which might be candidates for __attribute__((pure))
642 Wsuggest-attribute=noreturn
643 Common Var(warn_suggest_attribute_noreturn) Warning
644 Warn about functions which might be candidates for __attribute__((noreturn))
647 Common Var(warn_system_headers) Warning
648 Do not suppress warnings from system headers
651 Common Var(warn_trampolines) Warning
652 Warn whenever a trampoline is generated
655 Common Var(warn_type_limits) Warning EnabledBy(Wextra)
656 Warn if a comparison is always true or always false due to the limited range of the data type
659 Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
660 Warn about uninitialized automatic variables
663 Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
664 Warn about maybe uninitialized automatic variables
668 Does nothing. Preserved for backward compatibility.
671 Common Var(warn_unused) Init(0) Warning
672 Enable all -Wunused- warnings
674 Wunused-but-set-parameter
675 Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
676 Warn when a function parameter is only set, otherwise unused
678 Wunused-but-set-variable
679 Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
680 Warn when a variable is only set, otherwise unused
683 Common Var(warn_unused_function) Warning EnabledBy(Wunused)
684 Warn when a function is unused
687 Common Var(warn_unused_label) Warning EnabledBy(Wunused)
688 Warn when a label is unused
691 Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
692 Warn when a function parameter is unused
695 Common Var(warn_unused_value) Warning EnabledBy(Wunused)
696 Warn when an expression value is unused
699 Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
700 Warn when a variable is unused
703 Common Var(warn_coverage_mismatch) Init(1) Warning
704 Warn in case profiles in -fprofile-use do not match
706 Wvector-operation-performance
707 Common Var(warn_vector_operation_performance) Warning
708 Warn when a vector operation is compiled outside the SIMD
723 Common Separate Var(aux_info_file_name)
724 -aux-info <file> Emit declaration information into <file>
727 Common Joined Alias(aux-info)
730 Common Separate RejectDriver Var(aux_base_name)
733 Common Separate RejectDriver
743 -d<letters> Enable dumps from specific passes of the compiler
746 Common Separate Var(dump_base_name)
747 -dumpbase <file> Set the file basename to be used for dumps
750 Common Separate Var(dump_dir_name)
751 -dumpdir <dir> Set the directory name to be used for dumps
763 Driver Joined Separate
765 ; This option has historically been passed down to the linker by an
766 ; accident of a %{e*} spec, so ensure it continues to be passed down
767 ; as a single option. The supported option for this purpose is
768 ; -rdynamic. See PR 47390.
772 ; The version of the C++ ABI in use. The following values are allowed:
774 ; 0: The version of the ABI believed most conformant with the C++ ABI
775 ; specification. This ABI may change as bugs are discovered and fixed.
776 ; Therefore, 0 will not necessarily indicate the same ABI in different
779 ; 1: The version of the ABI first used in G++ 3.2.
781 ; 2: The version of the ABI first used in G++ 3.4 (and current default).
783 ; 3: The version of the ABI that fixes the missing underscore
784 ; in template non-type arguments of pointer type.
786 ; 4: The version of the ABI that introduces unambiguous mangling of
787 ; vector types. First selectable in G++ 4.5.
789 ; 5: The version of the ABI that ignores attribute const/noreturn
790 ; in function pointer mangling, and corrects mangling of decltype and
791 ; function parameters used in other parameters and the return type.
792 ; First selectable in G++ 4.6.
794 ; 6: The version of the ABI that doesn't promote scoped enums to int and
795 ; changes the mangling of template argument packs, const/static_cast,
796 ; prefix ++ and --, and a class scope function used as a template
798 ; First selectable in G++ 4.7.
800 ; 7: The version of the ABI that treats nullptr_t as a builtin type and
801 ; corrects the mangling of lambdas in default argument scope.
802 ; First selectable in G++ 4.8.
804 ; 8: The version of the ABI that corrects the substitution behavior of
805 ; function types with function-cv-qualifiers.
806 ; First selectable in G++ 4.9.
808 ; Additional positive integers will be assigned as new versions of
809 ; the ABI become the default version of the ABI.
811 Common Joined RejectNegative UInteger Var(flag_abi_version) Init(2)
813 faggressive-loop-optimizations
814 Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
815 Aggressively optimize loops using language constraints
818 Common Report Var(align_functions,0) Optimization UInteger
819 Align the start of functions
822 Common RejectNegative Joined UInteger Var(align_functions)
825 Common Report Var(align_jumps,0) Optimization UInteger
826 Align labels which are only reached by jumping
829 Common RejectNegative Joined UInteger Var(align_jumps)
832 Common Report Var(align_labels,0) Optimization UInteger
836 Common RejectNegative Joined UInteger Var(align_labels)
839 Common Report Var(align_loops,0) Optimization UInteger
840 Align the start of loops
843 Common RejectNegative Joined UInteger Var(align_loops)
847 Does nothing. Preserved for backward compatibility.
851 Does nothing. Preserved for backward compatibility.
853 fargument-noalias-global
855 Does nothing. Preserved for backward compatibility.
857 fargument-noalias-anything
859 Does nothing. Preserved for backward compatibility.
862 Common Driver Report Joined
863 Select what to sanitize
865 fasynchronous-unwind-tables
866 Common Report Var(flag_asynchronous_unwind_tables) Optimization
867 Generate unwind tables that are exact at each instruction boundary
870 Common Report Var(flag_auto_inc_dec) Init(1)
871 Generate auto-inc/dec instructions
873 ; -fcheck-bounds causes gcc to generate array bounds checks.
874 ; For C, C++ and ObjC: defaults off.
875 ; For Java: defaults to on.
876 ; For Fortran: defaults to off.
878 Common Report Var(flag_bounds_check)
879 Generate code to check bounds before indexing arrays
882 Common Report Var(flag_branch_on_count_reg) Optimization
883 Replace add, compare, branch with branch on count register
885 fbranch-probabilities
886 Common Report Var(flag_branch_probabilities) Optimization
887 Use profiling information for branch probabilities
889 fbranch-target-load-optimize
890 Common Report Var(flag_branch_target_load_optimize) Optimization
891 Perform branch target load optimization before prologue / epilogue threading
893 fbranch-target-load-optimize2
894 Common Report Var(flag_branch_target_load_optimize2) Optimization
895 Perform branch target load optimization after prologue / epilogue threading
898 Common Report Var(flag_btr_bb_exclusive) Optimization
899 Restrict target load migration not to re-use registers in any basic block
902 Common Joined RejectNegative Var(common_deferred_options) Defer
903 -fcall-saved-<register> Mark <register> as being preserved across functions
906 Common Joined RejectNegative Var(common_deferred_options) Defer
907 -fcall-used-<register> Mark <register> as being corrupted by function calls
909 ; Nonzero for -fcaller-saves: allocate values in regs that need to
910 ; be saved across function calls, if that produces overall better code.
911 ; Optional now, so people can test it.
913 Common Report Var(flag_caller_saves) Optimization
914 Save registers around function calls
917 Common Report Var(flag_check_data_deps)
918 Compare the results of several data dependence analyzers.
921 Common Var(flag_check_new)
922 Check the return value of new in C++
924 fcombine-stack-adjustments
925 Common Report Var(flag_combine_stack_adjustments) Optimization
926 Looks for opportunities to reduce stack adjustments and stack references.
929 Common Report Var(flag_no_common,0) Optimization
930 Do not put uninitialized globals in the common section
934 ; Converted by the driver to -fcompare-debug= options.
937 Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
938 -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
940 fcompare-debug-second
941 Common Driver RejectNegative Var(flag_compare_debug)
942 Run only the second compilation of -fcompare-debug
945 Common Report Var(flag_compare_elim_after_reload) Optimization
946 Perform comparison elimination after register allocation has finished
949 Common Var(flag_conserve_stack) Optimization
950 Do not perform optimizations increasing noticeably stack usage
953 Common Report Var(flag_cprop_registers) Optimization
954 Perform a register copy-propagation optimization pass
957 Common Report Var(flag_crossjumping) Optimization
958 Perform cross-jumping optimization
961 Common Report Var(flag_cse_follow_jumps) Optimization
962 When running CSE, follow jumps to their targets
966 Does nothing. Preserved for backward compatibility.
969 Common Report Var(flag_cx_limited_range) Optimization SetByCombined
970 Omit range reduction step when performing complex division
973 Common Report Var(flag_cx_fortran_rules) Optimization
974 Complex multiplication and division follow Fortran rules
977 Common Report Var(flag_data_sections) Optimization
978 Place data items into their own section
981 Common Report Var(common_deferred_options) Defer
982 List all available debugging counters with their limits and counts.
985 Common RejectNegative Joined Var(common_deferred_options) Defer
986 -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
989 Common Joined RejectNegative Var(common_deferred_options) Defer
990 Map one directory name to another in debug information
993 Common Report Var(flag_debug_types_section) Init(0)
994 Output .debug_types section when using DWARF v4 debuginfo.
996 ; Nonzero for -fdefer-pop: don't pop args after each function call
997 ; instead save them up to pop many calls' args with one insns.
999 Common Report Var(flag_defer_pop) Optimization
1000 Defer popping functions args from stack until later
1003 Common Report Var(flag_delayed_branch) Optimization
1004 Attempt to fill delay slots of branch instructions
1006 fdelete-dead-exceptions
1007 Common Report Var(flag_delete_dead_exceptions) Init(0)
1008 Delete dead instructions that may throw exceptions
1010 fdelete-null-pointer-checks
1011 Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
1012 Delete useless null pointer checks
1014 fdevirtualize-speculatively
1015 Common Report Var(flag_devirtualize_speculatively) Optimization
1016 Perform speculative devirtualization
1019 Common Report Var(flag_devirtualize) Optimization
1020 Try to convert virtual calls to direct ones.
1022 fdiagnostics-show-location=
1023 Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
1024 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
1026 ; Required for these enum values.
1031 Name(diagnostic_prefixing_rule) Type(int)
1034 Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
1037 Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
1039 fdiagnostics-show-caret
1040 Common Var(flag_diagnostics_show_caret) Init(1)
1041 Show the source line with a caret indicating the column
1044 Common Alias(fdiagnostics-color=,always,never)
1048 Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
1049 -fdiagnostics-color=[never|always|auto] Colorize diagnostics
1051 ; Required for these enum values.
1056 Name(diagnostic_color_rule) Type(int)
1059 Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
1062 Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
1065 Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
1067 fdiagnostics-show-option
1068 Common Var(flag_diagnostics_show_option) Init(1)
1069 Amend appropriate diagnostic messages with the command line option that controls them
1072 Common Joined RejectNegative Var(common_deferred_options) Defer
1073 -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
1076 Common Joined RejectNegative Var(common_deferred_options) Defer
1077 -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
1080 Common Joined RejectNegative Var(common_deferred_options) Defer
1081 -fdump-<type> Dump various compiler internals to a file
1084 Driver RejectNegative
1087 Common RejectNegative Joined Var(flag_dump_final_insns)
1088 -fdump-final-insns=filename Dump to filename the insns at the end of translation
1091 Common RejectNegative Joined Var(flag_dump_go_spec)
1092 -fdump-go-spec=filename Write all declarations to file as Go code
1095 Common Report Var(flag_dump_noaddr)
1096 Suppress output of addresses in debugging dumps
1099 Common Var(flag_dump_passes) Init(0)
1100 Dump optimization passes
1103 Common Report Var(flag_dump_unnumbered)
1104 Suppress output of instruction numbers, line number notes and addresses in debugging dumps
1106 fdump-unnumbered-links
1107 Common Report Var(flag_dump_unnumbered_links)
1108 Suppress output of previous and next insn numbers in debugging dumps
1111 Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
1112 Enable CFI tables via GAS assembler directives.
1115 Common Report Var(flag_early_inlining) Init(1) Optimization
1116 Perform early inlining
1118 feliminate-dwarf2-dups
1119 Common Report Var(flag_eliminate_dwarf2_dups)
1120 Perform DWARF2 duplicate elimination
1123 Common Report Var(flag_ipa_sra) Init(0) Optimization
1124 Perform interprocedural reduction of aggregates
1126 feliminate-unused-debug-symbols
1127 Common Report Var(flag_debug_only_used_symbols)
1128 Perform unused type elimination in debug info
1130 feliminate-unused-debug-types
1131 Common Report Var(flag_eliminate_unused_debug_types) Init(1)
1132 Perform unused type elimination in debug info
1134 femit-class-debug-always
1135 Common Report Var(flag_emit_class_debug_always) Init(0)
1136 Do not suppress C++ class debug information.
1139 Common Report Var(flag_exceptions) Optimization
1140 Enable exception handling
1142 fexpensive-optimizations
1143 Common Report Var(flag_expensive_optimizations) Optimization
1144 Perform a number of minor, expensive optimizations
1147 Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
1148 -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
1151 Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
1154 Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
1157 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
1163 Common Var(flag_fat_lto_objects)
1164 Output lto objects containing both the intermediate language and binary output.
1167 Common Report Var(flag_finite_math_only) Optimization SetByCombined
1168 Assume no NaNs or infinities are generated
1171 Common Joined RejectNegative Var(common_deferred_options) Defer
1172 -ffixed-<register> Mark <register> as being unavailable to the compiler
1175 Common Report Var(flag_float_store) Optimization
1176 Don't allocate floats and doubles in extended-precision registers
1180 Does nothing. Preserved for backward compatibility.
1183 Common Report Var(flag_forward_propagate) Optimization
1184 Perform a forward propagation pass on RTL
1187 Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST)
1188 -ffp-contract=[off|on|fast] Perform floating-point expression contraction.
1191 Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
1194 Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
1196 ; Not implemented, fall back to conservative FP_CONTRACT_OFF.
1198 Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
1201 Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
1203 ; Nonzero means don't put addresses of constant functions in registers.
1204 ; Used for compiling the Unix kernel, where strange substitutions are
1205 ; done on the assembly output.
1207 Common Report Var(flag_no_function_cse,0)
1208 Allow function addresses to be held in registers
1211 Common Report Var(flag_function_sections)
1212 Place each function into its own section
1215 Common Report Var(flag_gcse) Optimization
1216 Perform global common subexpression elimination
1219 Common Report Var(flag_gcse_lm) Init(1) Optimization
1220 Perform enhanced load motion during global common subexpression elimination
1223 Common Report Var(flag_gcse_sm) Init(0) Optimization
1224 Perform store motion after global common subexpression elimination
1227 Common Report Var(flag_gcse_las) Init(0) Optimization
1228 Perform redundant load after store elimination in global common subexpression
1232 Common Report Var(flag_gcse_after_reload) Optimization
1233 Perform global common subexpression elimination after register allocation
1236 ; This option is not documented yet as its semantics will change.
1238 Common Report Var(flag_graphite)
1239 Enable in and out of Graphite representation
1242 Common Report Var(flag_graphite_identity) Optimization
1243 Enable Graphite Identity transformation
1245 fhoist-adjacent-loads
1246 Common Report Var(flag_hoist_adjacent_loads) Optimization
1247 Enable hoisting adjacent loads to encourage generating conditional move
1250 floop-parallelize-all
1251 Common Report Var(flag_loop_parallelize_all) Optimization
1252 Mark all loops as parallel
1255 Common Report Var(flag_loop_strip_mine) Optimization
1256 Enable Loop Strip Mining transformation
1259 Common Report Var(flag_loop_interchange) Optimization
1260 Enable Loop Interchange transformation
1263 Common Report Var(flag_loop_block) Optimization
1264 Enable Loop Blocking transformation
1267 Common Report Var(flag_tm)
1268 Enable support for GNU transactional memory
1271 Common Report Var(flag_gnu_unique) Init(1)
1272 Use STB_GNU_UNIQUE if supported by the assembler
1276 Does nothing. Preserved for backward compatibility.
1279 Common Report Var(flag_loop_optimize_isl) Optimization
1280 Enable the ISL based loop nest optimizer
1282 fstrict-volatile-bitfields
1283 Common Report Var(flag_strict_volatile_bitfields) Init(-1)
1284 Force bitfield accesses to match their type width
1286 fguess-branch-probability
1287 Common Report Var(flag_guess_branch_prob) Optimization
1288 Enable guessing of branch probabilities
1290 ; Nonzero means ignore `#ident' directives. 0 means handle them.
1291 ; Generate position-independent code for executables if possible
1292 ; On SVR4 targets, it also controls whether or not to emit a
1293 ; string identifying the compiler.
1295 Common Report Var(flag_no_ident,0)
1296 Process #ident directives
1299 Common Report Var(flag_if_conversion) Optimization
1300 Perform conversion of conditional jumps to branchless equivalents
1303 Common Report Var(flag_if_conversion2) Optimization
1304 Perform conversion of conditional jumps to conditional execution
1307 Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
1308 -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
1311 Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
1314 Enum(stack_reuse_level) String(all) Value(SR_ALL)
1317 Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
1320 Enum(stack_reuse_level) String(none) Value(SR_NONE)
1322 ftree-loop-if-convert
1323 Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
1324 Convert conditional jumps in innermost loops to branchless equivalents
1326 ftree-loop-if-convert-stores
1327 Common Report Var(flag_tree_loop_if_convert_stores) Optimization
1328 Also if-convert conditional jumps containing memory writes
1330 ; -finhibit-size-directive inhibits output of .size for ELF.
1331 ; This is used only for compiling crtstuff.c,
1332 ; and it may be extended to other effects
1333 ; needed for crtstuff.c on other systems.
1334 finhibit-size-directive
1335 Common Report Var(flag_inhibit_size_directive)
1336 Do not generate .size directives
1339 Common Report Var(flag_indirect_inlining)
1340 Perform indirect inlining
1342 ; General flag to enable inlining. Specifying -fno-inline will disable
1343 ; all inlining apart from always-inline functions.
1345 Common Report Var(flag_no_inline,0) Init(0) Optimization
1346 Enable inlining of function declared \"inline\", disabling disables all inlining
1348 finline-small-functions
1349 Common Report Var(flag_inline_small_functions) Optimization
1350 Integrate functions into their callers when code size is known not to grow
1353 Common Report Var(flag_inline_functions) Optimization
1354 Integrate functions not declared \"inline\" into their callers when profitable
1356 finline-functions-called-once
1357 Common Report Var(flag_inline_functions_called_once) Optimization
1358 Integrate functions only required by their single caller
1361 Common RejectNegative Joined Alias(finline-limit=)
1364 Common RejectNegative Joined UInteger
1365 -finline-limit=<number> Limit the size of inlined functions to <number>
1368 Common Report Var(flag_inline_atomics) Init(1) Optimization
1369 Inline __atomic operations when a lock free instruction sequence is available.
1371 finstrument-functions
1372 Common Report Var(flag_instrument_function_entry_exit)
1373 Instrument function entry and exit with profiling calls
1375 finstrument-functions-exclude-function-list=
1376 Common RejectNegative Joined
1377 -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
1379 finstrument-functions-exclude-file-list=
1380 Common RejectNegative Joined
1381 -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
1384 Common Report Var(flag_ipa_cp) Optimization
1385 Perform interprocedural constant propagation
1388 Common Report Var(flag_ipa_cp_clone) Optimization
1389 Perform cloning to make Interprocedural constant propagation stronger
1392 Common Report Var(flag_ipa_profile) Init(0) Optimization
1393 Perform interprocedural profile propagation
1396 Common Report Var(flag_ipa_pta) Init(0) Optimization
1397 Perform interprocedural points-to analysis
1400 Common Report Var(flag_ipa_pure_const) Init(0) Optimization
1401 Discover pure and const functions
1404 Common Report Var(flag_ipa_reference) Init(0) Optimization
1405 Discover readonly and non addressable static variables
1409 Does nothing. Preserved for backward compatibility.
1413 Does nothing. Preserved for backward compatibility.
1416 Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
1417 -fira-algorithm=[CB|priority] Set the used IRA algorithm
1420 Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
1423 Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
1426 Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
1429 Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
1430 -fira-region=[one|all|mixed] Set regions for IRA
1433 Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
1436 Enum(ira_region) String(one) Value(IRA_REGION_ONE)
1439 Enum(ira_region) String(all) Value(IRA_REGION_ALL)
1442 Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
1445 Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
1446 Use IRA based register pressure calculation
1447 in RTL hoist optimizations.
1450 Common Report Var(flag_ira_loop_pressure) Optimization
1451 Use IRA based register pressure calculation
1452 in RTL loop optimizations.
1454 fira-share-save-slots
1455 Common Report Var(flag_ira_share_save_slots) Init(1)
1456 Share slots for saving different hard registers.
1458 fira-share-spill-slots
1459 Common Report Var(flag_ira_share_spill_slots) Init(1)
1460 Share stack slots for spilled pseudo-registers.
1463 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
1464 -fira-verbose=<number> Control IRA's level of diagnostic messages.
1467 Common Report Var(flag_ivopts) Init(1) Optimization
1468 Optimize induction variables on trees
1471 Common Var(flag_jump_tables) Init(1) Optimization
1472 Use jump tables for sufficiently large switch statements
1474 fkeep-inline-functions
1475 Common Report Var(flag_keep_inline_functions)
1476 Generate code for functions even if they are fully inlined
1479 Common Report Var(flag_keep_static_consts) Init(1)
1480 Emit static const variables even if they are not used
1483 Common Report Var(flag_leading_underscore) Init(-1)
1484 Give external symbols a leading underscore
1488 Does nothing. Preserved for backward compatibility.
1492 Enable link-time optimization.
1495 Common RejectNegative Joined Var(flag_lto)
1496 Link-time optimization with number of parallel jobs or jobserver.
1499 Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
1502 Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
1505 Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
1508 Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
1511 Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
1514 Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
1517 Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
1518 Specify the algorithm to partition symbols and vars at linktime
1520 ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
1521 flto-compression-level=
1522 Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
1523 -flto-compression-level=<number> Use zlib compression level <number> for IL
1526 Common Report Var(flag_lto_report) Init(0)
1527 Report various link-time optimization statistics
1530 Common Report Var(flag_lto_report_wpa) Init(0)
1531 Report various link-time optimization statistics for WPA only
1534 Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
1535 Set errno after built-in math functions
1538 Common Joined RejectNegative UInteger Var(flag_max_errors)
1539 -fmax-errors=<number> Maximum number of errors to report
1542 Common Report Var(mem_report)
1543 Report on permanent memory allocation
1546 Common Report Var(mem_report_wpa)
1547 Report on permanent memory allocation in WPA only
1549 ; This will attempt to merge constant section constants, if 1 only
1550 ; string constants and constants from constant pool, if 2 also constant
1552 fmerge-all-constants
1553 Common Report Var(flag_merge_constants,2) Init(1) Optimization
1554 Attempt to merge identical constants and constant variables
1557 Common Report Var(flag_merge_constants,1) Optimization
1558 Attempt to merge identical constants across compilation units
1560 fmerge-debug-strings
1561 Common Report Var(flag_merge_debug_strings) Init(1)
1562 Attempt to merge identical debug strings across compilation units
1565 Common RejectNegative Joined UInteger
1566 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
1569 Common Report Var(flag_modulo_sched) Optimization
1570 Perform SMS based modulo scheduling before the first scheduling pass
1572 fmodulo-sched-allow-regmoves
1573 Common Report Var(flag_modulo_sched_allow_regmoves)
1574 Perform SMS based modulo scheduling with register moves allowed
1576 fmove-loop-invariants
1577 Common Report Var(flag_move_loop_invariants) Optimization
1578 Move loop invariant computations out of loops
1581 Common Var(flag_dce) Init(1) Optimization
1582 Use the RTL dead code elimination pass
1585 Common Var(flag_dse) Init(1) Optimization
1586 Use the RTL dead store elimination pass
1588 freschedule-modulo-scheduled-loops
1589 Common Report Var(flag_resched_modulo_sched) Optimization
1590 Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
1592 fnon-call-exceptions
1593 Common Report Var(flag_non_call_exceptions) Optimization
1594 Support synchronous non-call exceptions
1597 Common Report Var(flag_omit_frame_pointer) Optimization
1598 When possible do not generate stack frames
1601 Common Report Var(flag_opt_info) Optimization
1602 Enable all optimization info dumps on stderr
1605 Common Joined RejectNegative Var(common_deferred_options) Defer
1606 -fopt-info[-<type>=filename] Dump compiler optimization details
1608 foptimize-register-move
1610 Does nothing. Preserved for backward compatibility.
1612 foptimize-sibling-calls
1613 Common Report Var(flag_optimize_sibling_calls) Optimization
1614 Optimize sibling and tail recursive calls
1617 Common Report Var(flag_partial_inlining)
1618 Perform partial inlining
1621 Common Report Var(pre_ipa_mem_report)
1622 Report on memory allocation before interprocedural optimization
1624 fpost-ipa-mem-report
1625 Common Report Var(post_ipa_mem_report)
1626 Report on memory allocation before interprocedural optimization
1629 Common Report Var(flag_pack_struct) Optimization
1630 Pack structure members together without holes
1633 Common RejectNegative Joined UInteger Optimization
1634 -fpack-struct=<number> Set initial maximum structure member alignment
1637 Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
1638 Return small aggregates in memory, not registers
1641 Common Report Var(flag_peel_loops) Optimization
1642 Perform loop peeling
1645 Common Report Var(flag_no_peephole,0) Optimization
1646 Enable machine specific peephole optimizations
1649 Common Report Var(flag_peephole2) Optimization
1650 Enable an RTL peephole pass before sched2
1653 Common Report Var(flag_pic,2) Negative(fPIE)
1654 Generate position-independent code if possible (large mode)
1657 Common Report Var(flag_pie,2) Negative(fpic)
1658 Generate position-independent code for executables if possible (large mode)
1661 Common Report Var(flag_pic,1) Negative(fpie)
1662 Generate position-independent code if possible (small mode)
1665 Common Report Var(flag_pie,1) Negative(fPIC)
1666 Generate position-independent code for executables if possible (small mode)
1669 Common Joined RejectNegative Var(common_deferred_options) Defer
1670 Specify a plugin to load
1673 Common Joined RejectNegative Var(common_deferred_options) Defer
1674 -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
1676 fpredictive-commoning
1677 Common Report Var(flag_predictive_commoning) Optimization
1678 Run predictive commoning optimization.
1680 fprefetch-loop-arrays
1681 Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
1682 Generate prefetch instructions, if available, for arrays in loops
1685 Common Report Var(profile_flag)
1686 Enable basic program profiling code
1689 Common Report Var(profile_arc_flag)
1690 Insert arc-based program profiling code
1693 Common Joined RejectNegative Var(profile_data_prefix)
1694 Set the top-level directory for storing the profile data.
1695 The default is 'pwd'.
1698 Common Report Var(flag_profile_correction)
1699 Enable correction of flow inconsistent profile data input
1703 Enable common options for generating profile info for profile feedback directed optimizations
1706 Common Joined RejectNegative
1707 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
1710 Common Var(flag_profile_use)
1711 Enable common options for performing profile feedback directed optimizations
1714 Common Joined RejectNegative
1715 Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
1718 Common Report Var(flag_profile_values)
1719 Insert code to profile values of expressions
1722 Common Report Var(profile_report)
1723 Report on consistency of profile
1725 fprofile-reorder-functions
1726 Common Report Var(flag_profile_reorder_functions)
1727 Enable function reordering that improves code placement
1730 Common Var(common_deferred_options) Defer
1733 Common Joined RejectNegative Var(common_deferred_options) Defer
1734 -frandom-seed=<string> Make compile reproducible using <string>
1736 ; This switch causes the command line that was used to create an
1737 ; object file to be recorded into the object file. The exact format
1738 ; of this recording is target and binary file format dependent.
1739 ; It is related to the -fverbose-asm switch, but that switch only
1740 ; records information in the assembler output file as comments, so
1741 ; they never reach the object file.
1742 frecord-gcc-switches
1743 Common Report Var(flag_record_gcc_switches)
1744 Record gcc command line switches in the object file.
1747 Common Report Var(flag_pcc_struct_return,0) Optimization
1748 Return small aggregates in registers
1752 Does nothing. Preserved for backward compatibility.
1754 flive-range-shrinkage
1755 Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
1756 Relief of register pressure through live range shrinkage
1759 Common Report Var(flag_rename_registers) Init(2) Optimization
1760 Perform a register renaming optimization pass
1763 Common Report Var(flag_reorder_blocks) Optimization
1764 Reorder basic blocks to improve code placement
1766 freorder-blocks-and-partition
1767 Common Report Var(flag_reorder_blocks_and_partition) Optimization
1768 Reorder basic blocks and partition into hot and cold sections
1771 Common Report Var(flag_reorder_functions) Optimization
1772 Reorder functions to improve code placement
1774 frerun-cse-after-loop
1775 Common Report Var(flag_rerun_cse_after_loop) Optimization
1776 Add a common subexpression elimination pass after loop optimizations
1780 Does nothing. Preserved for backward compatibility.
1783 Common Report Var(flag_rounding_math) Optimization SetByCombined
1784 Disable optimizations that assume default FP rounding behavior
1787 Common Report Var(flag_schedule_interblock) Init(1) Optimization
1788 Enable scheduling across basic blocks
1791 Common Report Var(flag_sched_pressure) Init(0) Optimization
1792 Enable register pressure sensitive insn scheduling
1795 Common Report Var(flag_schedule_speculative) Init(1) Optimization
1796 Allow speculative motion of non-loads
1799 Common Report Var(flag_schedule_speculative_load) Optimization
1800 Allow speculative motion of some loads
1802 fsched-spec-load-dangerous
1803 Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
1804 Allow speculative motion of more loads
1807 Common RejectNegative Joined UInteger Var(sched_verbose_param)
1808 -fsched-verbose=<number> Set the verbosity level of the scheduler
1810 fsched2-use-superblocks
1811 Common Report Var(flag_sched2_use_superblocks) Optimization
1812 If scheduling post reload, do superblock scheduling
1816 Does nothing. Preserved for backward compatibility.
1819 Common Report Var(flag_schedule_insns) Optimization
1820 Reschedule instructions before register allocation
1823 Common Report Var(flag_schedule_insns_after_reload) Optimization
1824 Reschedule instructions after register allocation
1826 ; This flag should be on when a target implements non-trivial
1827 ; scheduling hooks, maybe saving some information for its own sake.
1828 ; On IA64, for example, this is used for correct bundling.
1829 fselective-scheduling
1830 Common Report Var(flag_selective_scheduling) Optimization
1831 Schedule instructions using selective scheduling algorithm
1833 fselective-scheduling2
1834 Common Report Var(flag_selective_scheduling2) Optimization
1835 Run selective scheduling after reload
1837 fsel-sched-pipelining
1838 Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
1839 Perform software pipelining of inner loops during selective scheduling
1841 fsel-sched-pipelining-outer-loops
1842 Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
1843 Perform software pipelining of outer loops during selective scheduling
1845 fsel-sched-reschedule-pipelined
1846 Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
1847 Reschedule pipelined regions without pipelining
1849 ; sched_stalled_insns means that insns can be moved prematurely from the queue
1850 ; of stalled insns into the ready list.
1851 fsched-stalled-insns
1852 Common Report Var(flag_sched_stalled_insns) Optimization UInteger
1853 Allow premature scheduling of queued insns
1855 fsched-stalled-insns=
1856 Common RejectNegative Joined UInteger
1857 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
1859 ; sched_stalled_insns_dep controls how many recently scheduled cycles will
1860 ; be examined for a dependency on a stalled insn that is candidate for
1861 ; premature removal from the queue of stalled insns into the ready list (has
1862 ; an effect only if the flag 'sched_stalled_insns' is set).
1863 fsched-stalled-insns-dep
1864 Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
1865 Set dependence distance checking in premature scheduling of queued insns
1867 fsched-stalled-insns-dep=
1868 Common RejectNegative Joined UInteger
1869 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
1871 fsched-group-heuristic
1872 Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
1873 Enable the group heuristic in the scheduler
1875 fsched-critical-path-heuristic
1876 Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
1877 Enable the critical path heuristic in the scheduler
1879 fsched-spec-insn-heuristic
1880 Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
1881 Enable the speculative instruction heuristic in the scheduler
1883 fsched-rank-heuristic
1884 Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
1885 Enable the rank heuristic in the scheduler
1887 fsched-last-insn-heuristic
1888 Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
1889 Enable the last instruction heuristic in the scheduler
1891 fsched-dep-count-heuristic
1892 Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
1893 Enable the dependent count heuristic in the scheduler
1896 Common Report Var(flag_section_anchors) Optimization
1897 Access data in the same section from shared anchor points
1901 Does nothing. Preserved for backward compatibility.
1905 Does nothing. Preserved for backward compatibility.
1908 Common Report Var(flag_ree) Init(0)
1909 Turn on Redundant Extensions Elimination pass.
1912 Common Report Var(flag_show_column) Init(1)
1913 Show column numbers in diagnostics, when available. Default on
1916 Common Report Var(flag_shrink_wrap) Optimization
1917 Emit function prologues only before parts of the function that need it,
1918 rather than at the top of the function.
1921 Common Report Var(flag_signaling_nans) Optimization SetByCombined
1922 Disable optimizations observable by IEEE signaling NaNs
1925 Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
1926 Disable floating point optimizations that ignore the IEEE signedness of zero
1928 fsingle-precision-constant
1929 Common Report Var(flag_single_precision_constant) Optimization
1930 Convert floating point constants to single precision constants
1932 fsplit-ivs-in-unroller
1933 Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
1934 Split lifetimes of induction variables when loops are unrolled
1937 Common Report Var(flag_split_stack) Init(-1)
1938 Generate discontiguous stack frames
1941 Common Report Var(flag_split_wide_types) Optimization
1942 Split wide types into independent registers
1944 fvariable-expansion-in-unroller
1945 Common Report Var(flag_variable_expansion_in_unroller) Optimization
1946 Apply variable expansion when loops are unrolled
1949 Common Report RejectNegative Joined
1950 -fstack-check=[no|generic|specific] Insert stack checking code into the program
1953 Common Alias(fstack-check=, specific, no)
1954 Insert stack checking code into the program. Same as -fstack-check=specific
1957 Common Var(common_deferred_options) Defer
1959 fstack-limit-register=
1960 Common RejectNegative Joined Var(common_deferred_options) Defer
1961 -fstack-limit-register=<register> Trap if the stack goes past <register>
1963 fstack-limit-symbol=
1964 Common RejectNegative Joined Var(common_deferred_options) Defer
1965 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
1968 Common Report Var(flag_stack_protect, 1)
1969 Use propolice as a stack protection method
1971 fstack-protector-all
1972 Common Report RejectNegative Var(flag_stack_protect, 2)
1973 Use a stack protection method for every function
1975 fstack-protector-strong
1976 Common Report RejectNegative Var(flag_stack_protect, 3)
1977 Use a smart stack protection method for certain functions
1980 Common RejectNegative Var(flag_stack_usage)
1981 Output stack usage information on a per-function basis
1985 Does nothing. Preserved for backward compatibility.
1987 ; Nonzero if we should do (language-dependent) alias analysis.
1988 ; Typically, this analysis will assume that expressions of certain
1989 ; types do not alias expressions of certain other types. Only used
1990 ; if alias analysis (in general) is enabled.
1992 Common Report Var(flag_strict_aliasing) Optimization
1993 Assume strict aliasing rules apply
1996 Common Report Var(flag_strict_overflow)
1997 Treat signed overflow as undefined
2000 Common Report Var(flag_sync_libcalls) Init(1)
2001 Implement __atomic operations via libcalls to legacy __sync functions
2004 Common Report Var(flag_syntax_only)
2005 Check for syntax errors, then stop
2008 Common Report Var(flag_test_coverage)
2009 Create data files needed by \"gcov\"
2012 Common Report Var(flag_thread_jumps) Optimization
2013 Perform jump threading optimizations
2016 Common Report Var(time_report)
2017 Report the time taken by each compiler pass
2020 Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
2021 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
2024 Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
2027 Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
2030 Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
2033 Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
2036 Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
2039 Common Report Var(flag_toplevel_reorder) Init(2) Optimization
2040 Reorder top level functions, variables, and asms
2043 Common Report Var(flag_tracer)
2044 Perform superblock formation via tail duplication
2046 ; Zero means that floating-point math operations cannot generate a
2047 ; (user-visible) trap. This is the case, for example, in nonstop
2048 ; IEEE 754 arithmetic.
2050 Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
2051 Assume floating-point operations can trap
2054 Common Report Var(flag_trapv) Optimization
2055 Trap for signed overflow in addition, subtraction and multiplication
2058 Common Report Var(flag_tree_ccp) Optimization
2059 Enable SSA-CCP optimization on trees
2062 Common Report Var(flag_tree_bit_ccp) Optimization
2063 Enable SSA-BIT-CCP optimization on trees
2067 Does nothing. Preserved for backward compatibility.
2070 Common Report Var(flag_tree_ch) Optimization
2071 Enable loop header copying on trees
2073 ftree-coalesce-inlined-vars
2074 Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
2075 Enable coalescing of copy-related user variables that are inlined
2078 Common Report Var(flag_ssa_coalesce_vars,2) Optimization
2079 Enable coalescing of all copy-related user variables
2082 Common Report Var(flag_tree_copyrename) Optimization
2083 Replace SSA temporaries with better names in copies
2086 Common Report Var(flag_tree_copy_prop) Optimization
2087 Enable copy propagation on trees
2089 ftree-store-copy-prop
2091 Does nothing. Preserved for backward compatibility.
2094 Common Report Var(flag_tree_cselim) Init(2) Optimization
2095 Transform condition stores into unconditional ones
2097 ftree-switch-conversion
2098 Common Report Var(flag_tree_switch_conversion) Optimization
2099 Perform conversions of switch initializations.
2102 Common Report Var(flag_tree_dce) Optimization
2103 Enable SSA dead code elimination optimization on trees
2105 ftree-dominator-opts
2106 Common Report Var(flag_tree_dom) Optimization
2107 Enable dominator optimizations
2110 Common Report Var(flag_tree_tail_merge) Optimization
2111 Enable tail merging on trees
2114 Common Report Var(flag_tree_dse) Optimization
2115 Enable dead store elimination
2118 Common Report Var(flag_tree_forwprop) Init(1) Optimization
2119 Enable forward propagation on trees
2122 Common Report Var(flag_tree_fre) Optimization
2123 Enable Full Redundancy Elimination (FRE) on trees
2126 Common Report Var(flag_optimize_strlen) Optimization
2127 Enable string length optimizations on trees
2129 fisolate-erroneous-paths-dereference
2130 Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
2131 Detect paths which trigger erroneous or undefined behaviour due to
2132 dereferencing a NULL pointer. Isolate those paths from the main control
2133 flow and turn the statement with erroneous or undefined behaviour into a trap.
2135 fisolate-erroneous-paths-attribute
2136 Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
2137 Detect paths which trigger erroneous or undefined behaviour due a NULL value
2138 being used in a way which is forbidden by a returns_nonnull or nonnull
2139 attribute. Isolate those paths from the main control flow and turn the
2140 statement with erroneous or undefined behaviour into a trap.
2142 ftree-loop-distribution
2143 Common Report Var(flag_tree_loop_distribution) Optimization
2144 Enable loop distribution on trees
2146 ftree-loop-distribute-patterns
2147 Common Report Var(flag_tree_loop_distribute_patterns) Optimization
2148 Enable loop distribution for patterns transformed into a library call
2151 Common Report Var(flag_tree_loop_im) Init(1) Optimization
2152 Enable loop invariant motion on trees
2155 Common Alias(floop-interchange)
2156 Enable loop interchange transforms. Same as -floop-interchange
2159 Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
2160 Create canonical induction variables in loops
2163 Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
2164 Enable loop optimizations on tree level
2166 ftree-parallelize-loops=
2167 Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
2168 Enable automatic parallelization of loops
2171 Common Report Var(flag_tree_phiprop) Init(1) Optimization
2172 Enable hoisting loads from conditional pointers.
2175 Common Report Var(flag_tree_pre) Optimization
2176 Enable SSA-PRE optimization on trees
2179 Common Report Var(flag_tree_partial_pre) Optimization
2180 In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
2183 Common Report Var(flag_tree_pta) Optimization
2184 Perform function-local points-to analysis on trees.
2187 Common Report Var(flag_tree_reassoc) Init(1) Optimization
2188 Enable reassociation on tree level
2192 Does nothing. Preserved for backward compatibility.
2195 Common Report Var(flag_tree_sink) Optimization
2196 Enable SSA code sinking on trees
2199 Common Report Var(flag_tree_slsr) Optimization
2200 Perform straight-line strength reduction
2203 Common Report Var(flag_tree_sra) Optimization
2204 Perform scalar replacement of aggregates
2207 Common Report Var(flag_tree_ter) Optimization
2208 Replace temporary expressions in the SSA->normal pass
2211 Common Report Var(flag_tree_live_range_split) Optimization
2212 Perform live range splitting during the SSA->normal pass
2215 Common Report Var(flag_tree_vrp) Init(0) Optimization
2216 Perform Value Range Propagation on trees
2219 Common Report Var(flag_unit_at_a_time) Init(1) Optimization
2220 Compile whole compilation unit at a time
2223 Common Report Var(flag_unroll_loops) Optimization
2224 Perform loop unrolling when iteration count is known
2227 Common Report Var(flag_unroll_all_loops) Optimization
2228 Perform loop unrolling for all loops
2230 ; Nonzero means that loop optimizer may assume that the induction variables
2231 ; that control loops do not overflow and that the loops with nontrivial
2232 ; exit condition are not infinite
2233 funsafe-loop-optimizations
2234 Common Report Var(flag_unsafe_loop_optimizations) Optimization
2235 Allow loop optimizations to assume that the loops behave in normal way
2238 Common Report Var(flag_associative_math) SetByCombined
2239 Allow optimization for floating-point arithmetic which may change the
2240 result of the operation due to rounding.
2243 Common Report Var(flag_reciprocal_math) SetByCombined
2244 Same as -fassociative-math for expressions which include division.
2246 ; Nonzero means that unsafe floating-point math optimizations are allowed
2247 ; for the sake of speed. IEEE compliance is not guaranteed, and operations
2248 ; are allowed to assume that their arguments and results are "normal"
2249 ; (e.g., nonnegative for SQRT).
2250 funsafe-math-optimizations
2251 Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
2252 Allow math optimizations that may violate IEEE or ISO standards
2255 Common Report Var(flag_unswitch_loops) Optimization
2256 Perform loop unswitching
2259 Common Report Var(flag_unwind_tables) Optimization
2260 Just generate unwind tables for exception handling
2263 Common Driver Negative(fuse-ld=gold)
2264 Use the bfd linker instead of the default linker
2267 Common Driver Negative(fuse-ld=bfd)
2268 Use the gold linker instead of the default linker
2271 Common Undocumented Var(flag_use_linker_plugin)
2273 ; Positive if we should track variables, negative if we should run
2274 ; the var-tracking pass only to discard debug annotations, zero if
2275 ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
2276 ; will be set according to optimize, debug_info_level and debug_hooks
2277 ; in process_options ().
2279 Common Report Var(flag_var_tracking) Init(2) Optimization
2280 Perform variable tracking
2282 ; Positive if we should track variables at assignments, negative if
2283 ; we should run the var-tracking pass only to discard debug
2284 ; annotations. When flag_var_tracking_assignments ==
2285 ; AUTODETECT_VALUE it will be set according to flag_var_tracking.
2286 fvar-tracking-assignments
2287 Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
2288 Perform variable tracking by annotating assignments
2290 ; Nonzero if we should toggle flag_var_tracking_assignments after
2291 ; processing options and computing its default. */
2292 fvar-tracking-assignments-toggle
2293 Common Report Var(flag_var_tracking_assignments_toggle) Optimization
2294 Toggle -fvar-tracking-assignments
2296 ; Positive if we should track uninitialized variables, negative if
2297 ; we should run the var-tracking pass only to discard debug
2298 ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
2299 ; will be set according to flag_var_tracking.
2300 fvar-tracking-uninit
2301 Common Report Var(flag_var_tracking_uninit) Optimization
2302 Perform variable tracking and also tag variables that are uninitialized
2305 Common Report Var(flag_tree_vectorize) Optimization
2306 Enable vectorization on trees
2308 ftree-vectorizer-verbose=
2309 Common Joined RejectNegative Ignore
2310 Does nothing. Preserved for backward compatibility.
2312 ftree-loop-vectorize
2313 Common Report Var(flag_tree_loop_vectorize) Optimization
2314 Enable loop vectorization on trees
2317 Common Report Var(flag_tree_slp_vectorize) Optimization
2318 Enable basic block vectorization (SLP) on trees
2321 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT)
2322 Specifies the cost model for vectorization
2325 Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED)
2326 Specifies the vectorization cost model for code marked with a simd directive
2329 Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
2332 Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
2335 Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
2338 Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
2341 Common RejectNegative Alias(fvect-cost-model=,dynamic)
2342 Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
2345 Common RejectNegative Alias(fvect-cost-model=,unlimited)
2346 Enables the unlimited vectorizer cost model. Preserved for backward compatibility.
2348 ftree-vect-loop-version
2350 Does nothing. Preserved for backward compatibility.
2353 Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
2354 Enable copy propagation of scalar-evolution information.
2356 ; -fverbose-asm causes extra commentary information to be produced in
2357 ; the generated assembly code (to make it more readable). This option
2358 ; is generally only of use to those who actually need to read the
2359 ; generated assembly code (perhaps while debugging the compiler itself).
2360 ; -fno-verbose-asm, the default, causes the extra information
2361 ; to not be added and is useful when comparing two assembler files.
2363 Common Report Var(flag_verbose_asm)
2364 Add extra commentary to assembler output
2367 Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
2368 -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
2371 Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
2374 Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
2377 Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
2380 Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
2383 Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
2386 Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
2387 Validate vtable pointers before using them.
2390 Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
2393 Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
2396 Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
2399 Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
2402 Common Var(flag_vtv_counts)
2403 Output vtable verification counters.
2406 Common Var(flag_vtv_debug)
2407 Output vtable verification pointer sets information.
2410 Common Report Var(flag_value_profile_transformations) Optimization
2411 Use expression value profiles in optimizations
2414 Common Report Var(flag_web) Init(2) Optimization
2415 Construct webs and split unrelated uses of single variable
2417 ftree-builtin-call-dce
2418 Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
2419 Enable conditional dead code elimination for builtin calls
2422 Common Report Var(flag_whole_program) Init(0) Optimization
2423 Perform whole program optimizations
2426 Common Report Var(flag_wrapv) Optimization
2427 Assume signed arithmetic overflow wraps around
2429 fzero-initialized-in-bss
2430 Common Report Var(flag_zero_initialized_in_bss) Init(1)
2431 Put zero initialized data in the bss section
2434 Common JoinedOrMissing
2435 Generate debug information in default format
2438 Common JoinedOrMissing Negative(gdwarf)
2439 Generate debug information in COFF format
2442 Common JoinedOrMissing Negative(gdwarf-)
2443 Generate debug information in default version of DWARF format
2446 Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
2447 Generate debug information in DWARF v2 (or later) format
2450 Common JoinedOrMissing
2451 Generate debug information in default extended format
2454 Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
2455 Don't generate DWARF pubnames and pubtypes sections.
2458 Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
2459 Generate DWARF pubnames and pubtypes sections.
2462 Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
2463 Generate DWARF pubnames and pubtypes sections with GNU extensions.
2465 gno-record-gcc-switches
2466 Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
2467 Don't record gcc command line switches in DWARF DW_AT_producer.
2469 grecord-gcc-switches
2470 Common RejectNegative Var(dwarf_record_gcc_switches,1)
2471 Record gcc command line switches in DWARF DW_AT_producer.
2474 Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
2475 Don't generate debug information in separate .dwo files
2478 Common Driver RejectNegative Var(dwarf_split_debug_info,1)
2479 Generate debug information in separate .dwo files
2482 Common JoinedOrMissing Negative(gstabs+)
2483 Generate debug information in STABS format
2486 Common JoinedOrMissing Negative(gvms)
2487 Generate debug information in extended STABS format
2490 Common RejectNegative Var(dwarf_strict,0) Init(0)
2491 Emit DWARF additions beyond selected version
2494 Common Report RejectNegative Var(dwarf_strict,1)
2495 Don't emit DWARF additions beyond selected version
2498 Common Report Var(flag_gtoggle)
2499 Toggle debug information generation
2502 Common JoinedOrMissing Negative(gxcoff)
2503 Generate debug information in VMS format
2506 Common JoinedOrMissing Negative(gxcoff+)
2507 Generate debug information in XCOFF format
2510 Common JoinedOrMissing Negative(gcoff)
2511 Generate debug information in extended XCOFF format
2514 Driver Joined Separate
2517 Common Joined Var(plugindir_string) Init(0)
2518 -iplugindir=<dir> Set <dir> to be the default plugin directory
2521 Common Joined Separate RejectDriver Var(imultiarch) Init(0)
2522 -imultiarch <dir> Set <dir> to be the multiarch include subdirectory
2525 Driver Joined Separate
2530 no-canonical-prefixes
2543 Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
2544 -o <file> Place output into <file>
2547 Common Var(profile_flag)
2548 Enable function profiling
2551 Driver Var(pass_exit_codes)
2554 Common Alias(Wpedantic)
2557 Common Var(flag_pedantic_errors)
2558 Like -pedantic but issue them as errors
2564 Driver Var(use_pipes)
2567 Driver JoinedOrMissing Var(print_file_name)
2569 print-libgcc-file-name
2572 print-multi-directory
2573 Driver Var(print_multi_directory)
2576 Driver Var(print_multi_lib)
2578 print-multi-os-directory
2579 Driver Var(print_multi_os_directory)
2582 Driver Var(print_multiarch)
2585 Driver JoinedOrMissing Var(print_prog_name)
2588 Driver Var(print_search_dirs)
2591 Driver Var(print_sysroot)
2593 print-sysroot-headers-suffix
2594 Driver Var(print_sysroot_headers_suffix)
2597 Common Var(quiet_flag) RejectDriver
2598 Do not display functions compiled or elapsed time
2616 Driver Var(report_times)
2619 Driver JoinedOrMissing
2622 Driver Joined Separate
2626 ; C option, but driver must not handle as "-u ndef".
2629 Common Driver Var(verbose_flag)
2630 Enable verbose output
2633 Common Var(version_flag) RejectDriver
2634 Display the compiler's version
2637 Common Var(inhibit_warnings)
2641 Driver Separate Var(wrapper_string)
2644 Driver Joined Separate
2647 Driver RejectNegative Negative(pie)
2648 Create a shared library
2654 Driver Separate Alias(specs=)
2667 ; Documented for Fortran, but always accepted by driver.
2674 ; Documented for Go, but always accepted by driver.
2692 Driver RejectNegative Negative(shared)
2693 Create a position independent executable
2696 Driver Joined Separate
2698 ; This comment is to ensure we retain the blank line above.